The document describes a space vector PWM overmodulation scheme for a three-level inverter driving an induction motor for traction applications. It discusses:
1) The NPC three-level inverter topology and its 27 switching states.
2) The SVPWM strategy, which is divided into undermodulation and overmodulation modes. Undermodulation uses linear and hybrid regions, while overmodulation uses two regions to extend the modulation index from 0.907 to unity.
3) An indirect vector control method for the induction motor that provides fast torque response needed for traction drives.
4) Simulation and experimental results are presented to validate the proposed overmodulation algorithm.
Total Harmonic Distortion Analysis of a Four Switch 3-Phase Inverter Fed Spee...IJPEDS-IAES
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This paper investigates the performance of a Model reference adaptive system (MRAS) based cost-effective drive system of an induction motor (IM) for low-cost applications - high performance industrial drive systems. In this paper, the MRAS is used as a speed estimator and the motor is fed from a four-switch three-phase (FSTP) inverter instead of a conventional six- switch three-phase (SSTP) inverter. This configuration reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms and interface circuits, the proposed control approach reduces the computation for real-time implementation. The robustness of the proposed MRAS-based FSTP inverter fed IM drive is verified by Experimental results at different operating conditions using digital signal processor (DSP1103) for a 1.1 Kw motor. A performance comparison of the proposed FSTP inverter fed IM drive with a conventional SSTP inverter system is also made in terms of speed response and total harmonic distortion (THD) of the stator current. The proposed FSTP inverter fed IM drive is found quite acceptable considering its performance, cost reduction and other advantages features.
ENERGY EFFICIENT VARIABLE SPEED HIGH POWER FACTOR THREE PHASE INDUCTION MOTOR...Journal For Research
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Paper presents a new energy efficient technique of three phase AC to AC voltage control using medium frequency pulse width modulation and extinction angle control. This technique is deployed to obtain independent control on speed and power factor of the three phase induction motor, using four semiconductor controllable switches. The technique has been realized using AC freewheeling switch. Power factor (PF) of induction motor reduces as it depends on the load parameters, thus induction motor draws more current, increase stator copper losses. Increased stator copper losses of induction motor causes depreciation of power factor and efficiency. Proposed drive maintains power factor of induction motor at unity for controllable speed of the motor. Thus reduces current consumption of the motor at low speeds. Stator copper losses also reduce and efficiency of the motor is improved. Advantage of proposed drive is its higher efficiency and unity power factor with simplicity of control. .If number of motors are driven using the proposed drive, plenty of power conservation is possible.
Comparative Performance Study for Closed Loop Operation of an Adjustable Spee...IJPEDS-IAES
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In this paper an extensive comparative study is carried out between PI
and PID controlled closed loop model of an adjustable speed Permanent
Magnet Synchronous Motor (PMSM) drive. The incorporation of Sinusoidal
Pulse Width Modulation (SPWM) strategy establishes near sinusoidal
armature phase currents and comparatively less torque ripples without
sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the
information about reference speed is provided to a speed controller, to ensure
that actual drive speed tracks the reference speed with ideally zero steady
state speed error. The entire model of PMSM closed loop drive is divided
into two loops, inner loop current and outer loop speed. By taking the
different combinations of two classical controllers (PI & PID) related with
two loop control structure, different approximations are carried out. Hence a
typical comparative study is introduced to familiar with the different
performance indices of the system corresponding to time domain and
frequency domain specifications. Therefore overall performance of closed
loop PMSM drive is tested and effectiveness of controllers will be
determined for different combinations.
Enhanced Torque Control and Reduced Switching Frequency in Direct Torque Cont...IJPEDS-IAES
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Direct Torque Control (DTC) of induction machine has received wide
acceptance in many adjustable speed drive applications due to its simplicity
and high performance torque control. However, the DTC using a common
two-level inverter poses two major problems such as higher switching
frequency (or power loss) and larger torque ripple. These problems are due to
inappropriate voltage vectors which are selected among a limited number of
voltage vectors available in two-level inverter. The proposed research aims to
formulate an optimal switching strategy using Dual-Inverter Supplied Drive
for high performances of DTC. By using dual-inverter supplied, it provides
greater number of voltage vectors which can offer more options to select the
most appropriate voltage vectors. The most appropriate voltage vectors
should able to produce minimum torque slope but sufficient to satisfy torque
demands. The identification is accomplished by using an equation of rate of
change of torque which is derived from the induction machine equations. The
proposed strategy also introduces a block of modification of torque error
status which is responsible to modify the status such that it can determine the
most optimal voltage vectors from a look-up table, according to motor
operating conditions. The improvements obtained are as follows; 1)
minimization of switching frequency (reduce power loss), and 2) reduction of
torque ripple. Some improvements obtained in the proposed strategy were
verified via experimentations.
QUICK DYNAMIC TORQUE CONTROL IN DTC-HYSTERESIS-BASED INDUCTION MOTOR BY USING...ijiert bestjournal
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Induction machines are widely employed in industries due to their r ugged structure,high maintainability and economy than DC motors. There has been constant development in the i nduction motor drive system and their implementation in industrial applications. The improvement of switching speed of power electronic devices has enabled control techniques which possess high switching f requency and feasibility of high efficiency drive systems. In this pretext,Direct Torque Contr ol (DTC) was introduced to obtain quick and better dynamic torque response. The DTC scheme in its basic c onfiguration comprises torque and flux estimator DTC controller,stator voltage vector selector and voltage source inverter. Direct Torque Control of induction motor has increasingly become the best alternative to Field- Oriented Control methods. The performance of an induction motor under the classical Direct Torque Control method and improved scheme have been studied and confirmed by simulation using MATLAB.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
IRJET- Vector Control of Three Phase Induction MotorIRJET Journal
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This document discusses vector control of a three-phase induction motor. Vector control, also called field-oriented control, allows independent control of torque and flux in induction motors, similar to DC motors. The document describes:
1) How vector control works by transforming stator currents into orthogonal d-q components representing flux and torque.
2) The principle of field-oriented control which locks the d-q reference frame to the rotor flux vector for decoupled control of flux and torque.
3) The simulation model built in MATLAB/Simulink to test vector control, including blocks for Clarke/Park transformations, current control, and a PI speed controller.
Matrix Converter based Direct Torque Control of Induction MotorNeehar NLN
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This topic falls under the area of speed control of induction motor. The using of advanced power electronic converters provides better response. In this case, a AC/AC converter is used to control the induction motor.
Total Harmonic Distortion Analysis of a Four Switch 3-Phase Inverter Fed Spee...IJPEDS-IAES
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This paper investigates the performance of a Model reference adaptive system (MRAS) based cost-effective drive system of an induction motor (IM) for low-cost applications - high performance industrial drive systems. In this paper, the MRAS is used as a speed estimator and the motor is fed from a four-switch three-phase (FSTP) inverter instead of a conventional six- switch three-phase (SSTP) inverter. This configuration reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms and interface circuits, the proposed control approach reduces the computation for real-time implementation. The robustness of the proposed MRAS-based FSTP inverter fed IM drive is verified by Experimental results at different operating conditions using digital signal processor (DSP1103) for a 1.1 Kw motor. A performance comparison of the proposed FSTP inverter fed IM drive with a conventional SSTP inverter system is also made in terms of speed response and total harmonic distortion (THD) of the stator current. The proposed FSTP inverter fed IM drive is found quite acceptable considering its performance, cost reduction and other advantages features.
ENERGY EFFICIENT VARIABLE SPEED HIGH POWER FACTOR THREE PHASE INDUCTION MOTOR...Journal For Research
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Paper presents a new energy efficient technique of three phase AC to AC voltage control using medium frequency pulse width modulation and extinction angle control. This technique is deployed to obtain independent control on speed and power factor of the three phase induction motor, using four semiconductor controllable switches. The technique has been realized using AC freewheeling switch. Power factor (PF) of induction motor reduces as it depends on the load parameters, thus induction motor draws more current, increase stator copper losses. Increased stator copper losses of induction motor causes depreciation of power factor and efficiency. Proposed drive maintains power factor of induction motor at unity for controllable speed of the motor. Thus reduces current consumption of the motor at low speeds. Stator copper losses also reduce and efficiency of the motor is improved. Advantage of proposed drive is its higher efficiency and unity power factor with simplicity of control. .If number of motors are driven using the proposed drive, plenty of power conservation is possible.
Comparative Performance Study for Closed Loop Operation of an Adjustable Spee...IJPEDS-IAES
Â
In this paper an extensive comparative study is carried out between PI
and PID controlled closed loop model of an adjustable speed Permanent
Magnet Synchronous Motor (PMSM) drive. The incorporation of Sinusoidal
Pulse Width Modulation (SPWM) strategy establishes near sinusoidal
armature phase currents and comparatively less torque ripples without
sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the
information about reference speed is provided to a speed controller, to ensure
that actual drive speed tracks the reference speed with ideally zero steady
state speed error. The entire model of PMSM closed loop drive is divided
into two loops, inner loop current and outer loop speed. By taking the
different combinations of two classical controllers (PI & PID) related with
two loop control structure, different approximations are carried out. Hence a
typical comparative study is introduced to familiar with the different
performance indices of the system corresponding to time domain and
frequency domain specifications. Therefore overall performance of closed
loop PMSM drive is tested and effectiveness of controllers will be
determined for different combinations.
Enhanced Torque Control and Reduced Switching Frequency in Direct Torque Cont...IJPEDS-IAES
Â
Direct Torque Control (DTC) of induction machine has received wide
acceptance in many adjustable speed drive applications due to its simplicity
and high performance torque control. However, the DTC using a common
two-level inverter poses two major problems such as higher switching
frequency (or power loss) and larger torque ripple. These problems are due to
inappropriate voltage vectors which are selected among a limited number of
voltage vectors available in two-level inverter. The proposed research aims to
formulate an optimal switching strategy using Dual-Inverter Supplied Drive
for high performances of DTC. By using dual-inverter supplied, it provides
greater number of voltage vectors which can offer more options to select the
most appropriate voltage vectors. The most appropriate voltage vectors
should able to produce minimum torque slope but sufficient to satisfy torque
demands. The identification is accomplished by using an equation of rate of
change of torque which is derived from the induction machine equations. The
proposed strategy also introduces a block of modification of torque error
status which is responsible to modify the status such that it can determine the
most optimal voltage vectors from a look-up table, according to motor
operating conditions. The improvements obtained are as follows; 1)
minimization of switching frequency (reduce power loss), and 2) reduction of
torque ripple. Some improvements obtained in the proposed strategy were
verified via experimentations.
QUICK DYNAMIC TORQUE CONTROL IN DTC-HYSTERESIS-BASED INDUCTION MOTOR BY USING...ijiert bestjournal
Â
Induction machines are widely employed in industries due to their r ugged structure,high maintainability and economy than DC motors. There has been constant development in the i nduction motor drive system and their implementation in industrial applications. The improvement of switching speed of power electronic devices has enabled control techniques which possess high switching f requency and feasibility of high efficiency drive systems. In this pretext,Direct Torque Contr ol (DTC) was introduced to obtain quick and better dynamic torque response. The DTC scheme in its basic c onfiguration comprises torque and flux estimator DTC controller,stator voltage vector selector and voltage source inverter. Direct Torque Control of induction motor has increasingly become the best alternative to Field- Oriented Control methods. The performance of an induction motor under the classical Direct Torque Control method and improved scheme have been studied and confirmed by simulation using MATLAB.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
IRJET- Vector Control of Three Phase Induction MotorIRJET Journal
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This document discusses vector control of a three-phase induction motor. Vector control, also called field-oriented control, allows independent control of torque and flux in induction motors, similar to DC motors. The document describes:
1) How vector control works by transforming stator currents into orthogonal d-q components representing flux and torque.
2) The principle of field-oriented control which locks the d-q reference frame to the rotor flux vector for decoupled control of flux and torque.
3) The simulation model built in MATLAB/Simulink to test vector control, including blocks for Clarke/Park transformations, current control, and a PI speed controller.
Matrix Converter based Direct Torque Control of Induction MotorNeehar NLN
Â
This topic falls under the area of speed control of induction motor. The using of advanced power electronic converters provides better response. In this case, a AC/AC converter is used to control the induction motor.
Fuzzy logic Control & Minimizing Commutation Torque Ripple for Brushless DC M...Editor IJMTER
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Brushless dc motor still suffers from commutation torque ripple, which mainly depends
on speed and transient line current in the commutation interval. This paper presents a novel circuit
topology and a dc link voltage control strategy to keep incoming and outgoing phase currents
changing at the same rate during commutation. A dcâdc single-ended primary inductor converter
(SEPIC) and a switch selection circuit are employed in front of the inverter. The desired
commutation voltage is accomplished by the SEPIC converter. The dc link voltage control strategy is
carried out by the switch selection circuit to separate two procedures, adjusting the SEPIC converter
and regulating speed. The cause of commutation ripple is analyzed, and the way to obtain the desired
dc link voltage is introduced in detail. Finally, simulation and experimental results show that,
compared with the dcâdc converter, the proposed method can obtain the desired voltage much faster
and minimize commutation torque ripple more efficiently at both high and low speeds and the closed
loop control is achieved by Fuzzy logic control.
This document summarizes a research paper on sensorless direct torque control of interior permanent magnet synchronous motors for embedded systems using an MRAS observer. It begins with an introduction to embedded systems and IPMSMs. It then provides the mathematical model of an IPMSM and describes the principles of direct torque control, including flux and torque hysteresis controllers and the inverter switching table. It presents an MRAS observer as a sensorless closed-loop algorithm for estimating rotor speed and position. In the simulation results, the proposed sensorless DTC control method using an MRAS observer is effective for embedded system applications.
DTC Scheme for a Four-Switch Inverter-Fed PMBLDC Motor Emulating the Six-Swit...IJRST Journal
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The paper deals with the direct torque control (DTC) of brushless DC (BLDC) motor drives fed by four-switch three phase inverters (FSTPI) rather than six-switch inverters (SSTPI) in conventional drives. For any three phase inverter require six switches, but these switches are reduced to four. This reduction of power switches from six to four improves the reliability of the inverter, size of the inverter is reduced and cost of the inverter is also reduces. The FSTPI could be regarded as a reconfigured topology of the SSTPI in case of a switch/leg failure which represents a crucial reliability benefit for many applications especially in electric and hybrid propulsion systems. The DTC of FSTPI-fed BLDC motor drives is treated considering two strategies, such as: 1) DTC-1: a strategy inspired from the one intended to SSTPI-fed BLDC motor drives; 2) DTC-2: a strategy that considers a dedicated vector selection subtable in order to independently control the torques developed by the phases connected to the FSTPI legs during their simultaneous conduction. The operational principle of the four-switch BLDC motor drive and the developed control scheme are theoretically analyzed and the performance is demonstrated by simulation.
This document presents a study on implementing field oriented control of a three-phase induction motor drive using a digital signal processor. The control algorithm is developed using Code Composer Studio and implemented on a TMS320F2812 digital signal processor board. Field oriented control is achieved using an indirect vector control scheme with an inner current control loop and outer speed control loop using PI controllers. Space vector pulse width modulation is used to generate switching signals for the voltage source inverter driving the motor. Experimental results show the motor speed is able to track different speed commands while responding well to load disturbances.
Vf control of three phase induction motor drive with different pwm techniquesAlexander Decker
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This document discusses different pulse width modulation (PWM) techniques for controlling a three-phase induction motor, including sine triangle PWM (SPWM), third-harmonic PWM (THPWM), and space vector PWM (SVPWM). It simulates these techniques using MATLAB Simulink and compares their performance in terms of total harmonic distortion, output voltage harmonics, motor speed control, and efficiency. The results show that SVPWM provides superior performance with less harmonic distortion and higher utilization of the DC supply voltage. SVPWM also allows improved dynamic response when the induction motor is subjected to changes in reference speed or load torque. In conclusion, SVPWM is deemed the most efficient modulation technique for closed-loop control of induction motor drive systems
In the proposed approach,instead of a conventional 3- Phase inverter a component minimized single pha se inverter is utilized which reduces the cost of the inverter,th e switching losses,and the complexity of interface circuits to generate logic signals. A performance comparison of the prop osed inverter fed drive with a conventional 3Phase inverter fed drive is also mode in terms of speed response and t otal harmonic distortion (THD) of the stator curren t. The proposed inverter fed IM drive is found acceptable consideri ng its cost reduction and other advantageous featur es. A general pulse width modulation (PWM) method for c ontrol of 1-phase inverters is presented. The vecto r PWM offers a simple method to select three or four vectors tha t effectively synthesize the desired output voltage,even in presence of voltage oscillations across the two dc-link capacit ors. The influence of different switching patterns on output voltage symmetry,current waveform,switching frequency and common mode voltage can be examined. The paper als o discusses how the use of the wye and delta connecti ons of the motor windings affects the implementatio n of the pulse width modulator.
Performance evolution of a PMSG based WECS using maximum power point tracking...theijes
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The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Brushless DC motor Drive during Speed regulation with Current ControllerIJERA Editor
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Brushless DC Motor (BLDC) is one of the best electrical drives that have increasing popularity, due to their
high efficiency, reliability, good dynamic response and very low maintenance. Due to the increasing demand for
compact & reliable motors and the evolution of low cost power semiconductor switches and permanent magnet
(PM) materials, brushless DC motors become popular in every application from home appliances to aerospace
industry. The conventional techniques for controlling the stator phase current in a brushless DC drive are
practically effective in low speed and cannot reduce the commutation torque ripple in high speed range. This
paper presents the PI controller for speed control of BLDC motor. The output of the PI controllers is summed
and is given as the input to the current controller. The BLDC motor is fed from the inverter where the rotor
position and current controller is the input. The complete model of the proposed drive system is developed and
simulated using MATLAB/Simulink software. The operation principle of using component is analysed and the
simulation results are presented in this to verify the theoretical analysis.
To Study, Analysis and Implementation of Power Quality Improvement Using DSTA...ijtsrd
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This project illustrates the execution of a three stage delivery static compensator DSTATCOM by using a back propagation BP control algorithm for its capacities, such as load balancing and zero voltage management of reactive power compensation under non linear loads. We use BP based control algorithm to obtain the critical dynamic weight estimate here. And the BP based control algorithm is often used for estimating the receptive power portions of the load streams necessary for estimating the reference source streams. Regulation of power efficiency devices through neural networks is the new area of study in the field of power engineering. The extraction of the harmonic components defines the output of the balancing instruments. Here we use DSTATCOM and UPFC as balancing instruments. A DSTATCOM model is developed using a computerized signal processor and its implementation is focused on various working conditions. The execution of DSTATCOM is found to be suitable for various kinds of burdens with the proposed control algorithm. The BP based control algorithm is used to derive the fundamental weighted value of the active and reactive power components of the load present. Back propagation algorithm trained by the sample will detect the power quality signal issue in real time. Continuity, differentiability, non decreasing momotomy are the key features of this algorithm. The process of UPFC is close to that of DSTATCOM, although the only difference is that it does not have the device shut down in worse circumstances. The simulation model is developed with ANFIS and its output is studied under different operating conditions. The output of ANFIS is found to be satisfactory with the proposed control algorithm for different types of loads. The suggested method shall be checked by the results of MATLAB Simulink. Rohit Mishra | Ashish Bhargava "To Study, Analysis and Implementation of Power Quality Improvement Using DSTATCOM with ANN (Back Propagation Algorithm)" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47521.pdf Paper URL : https://www.ijtsrd.com/engineering/electrical-engineering/47521/to-study-analysis-and-implementation-of-power-quality-improvement-using-dstatcom-with-ann-back-propagation-algorithm/rohit-mishra
This document analyzes the performance and control of a brushless doubly fed reluctance machine (BDFRM). It presents the transient and steady-state governing equations of the BDFRM and describes a speed control scheme based on field orientation control. It studies the start-up behavior and effects of control winding voltage and frequency on machine performance through digital simulation. The document aims to predict dynamic and steady-state performance, demonstrate important operational aspects, study start-up and synchronization under voltage/frequency control, and develop a control technique for wide speed control.
IRJET - Improvement of Power Factor and Efficiency of Three Phase Inducti...IRJET Journal
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This document summarizes a research paper that investigates improving the power factor and efficiency of a three-phase induction motor through extinction angle control. It begins with an abstract that outlines using insulated-gate bipolar transistors (IGBTs) and diodes in a power circuit to generate extinction pulses and attaching this circuit to each phase of an induction motor drive. It then provides background on using advanced control techniques in power converters to improve system efficiency. The document describes the basic block diagram and control circuit used to generate gate pulses for the IGBT switches. It explains the operation involves three modes - active, dead time, and freewheeling - to efficiently deliver power to the motor load. The research aims to simultaneously improve both
This document discusses using an artificial neural network (ANN) for speed and torque control of a three-phase induction motor. It proposes a new ANN-based method for flux position estimation, sector selection, and voltage vector selection for direct torque control of induction motors. Simulation and experimental results show the ANN-based approach reduces torque and flux ripples compared to conventional direct torque control. The ANN-based speed controller also achieves good dynamic performance of the induction motor drive. Results indicate the ANN-based direct torque control scheme has better performance than the modified direct torque control scheme.
Improved Torque Control Performance in Direct Torque Control using Optimal Sw...IJPEDS-IAES
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This paper presents the significant improvement of Direct Torque Control (DTC) of 3-phases induction machine using a Cascaded H- Bidge Multilevel Inverter (CHMI). The largest torque ripple and variable switching frequency are known as the major problem founded in DTC of induction motor. As a result, it can diminish the performance induction motor control. Therefore, the conventional 2- level inverter has been replaced with CHMI the in order to increase the performance of the motor either in dynamic or steady-state condition. By using the multilevel inverter, it can produce a more selection of the voltage vectors. Besides that, it can minimize the torque ripple output as well as increase the efficiency by reducing the switching frequency of the inverter. The simulation model of the proposed method has been developed and tested by using Matlab software. Its improvements were also verified via experimental results.
Speed Control System of Induction Motor by using Direct Torque Control Method...ijtsrd
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Escalator is useful and act in the important part to carry passengers to the targeted floors of building. Every escalator must be driven by its own motor and this motor speed must be controled. To drive escalator with a constant speed, direct torque control technique is used to drive three phase squirrel cage induction motor. In this paper, the development of speed control system for three phase squirrel cage induction motor using a direct torque control method is presented and simulation for proposed system is done with the help of MATLAB SIMULINK. Soe Sandar Aung | Thet Naing Htun "Speed Control System of Induction Motor by using Direct Torque Control Method used in Escalator" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27903.pdfPaper URL: https://www.ijtsrd.com/engineering/electrical-engineering/27903/speed-control-system-of-induction-motor-by-using-direct-torque-control-method-used-in-escalator/soe-sandar-aung
This document presents a new sensorless commutation method for brushless DC motors. The key features of the proposed method are:
1) It extracts commutation signals directly from average line-to-line motor terminal voltages using simple RC filters and comparators, without needing phase shift circuits, motor neutral voltage measurements, or AD converters.
2) In contrast to conventional methods that detect back EMF zero crossings, the proposed method's commutation signals are in phase with ideal timing and insensitive to common mode noise.
3) Experimental results over a wide speed range show the proposed method provides satisfactory sensorless control performance while achieving significantly lower cost than conventional techniques.
Optimization of controlling of performance characteristics of induction moIAEME Publication
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This document summarizes an article from the International Journal of Electrical Engineering and Technology that proposes a fuzzy logic based online efficiency optimization control for an indirect vector controlled induction motor drive system. The control aims to minimize input power by decrementing rotor flux until the lowest power point is reached. This is done without requiring knowledge of motor parameters and is insensitive to parameter changes. Fast convergence is achieved using an adaptive excitation current step size, and low frequency torque pulsations are suppressed via feedforward compensation. The control scheme is described and mathematical models of the induction motor, electrical systems, and mechanical systems are provided.
Design of Electric Drive for Vehicular Application Using Vector ControlIOSR Journals
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This document describes the design of an electric drive system for a vehicular application using vector control. It proposes an induction motor fed by a three-phase voltage source inverter whose input comes from a boost converter. Indirect vector control is chosen as the control scheme due to its ability to provide fast and accurate torque control without needing rotor position sensors. Simulation results show the motor is able to achieve speed control within 2.5 seconds with less than 4% deviation from the reference speed.
Novel Direct Switching Power Control Method of UPFC by Using Matrix Converte...IJMER
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This paper presents a direct Switching power control for three-phase matrix converters
operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac
power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has
reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical
principles of direct Switching power control based on sliding mode control techniques are established
for an MC-UPFC dynamic model including the input filter. As a result, line active and reactive power,
together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix
converter switching state guaranteeing good steady-state and dynamic responses. Experimental results
of DSPC controllers for MC-UPFC show decoupled active and reactive power control, zero steady-state
tracking error, and fast response times. Compared to an MC-UPFC using active and reactive power
linear controllers based on a modified Venturing high-frequency PWM modulator, the experimental
results of the advanced DSPC-MC guarantee faster responses without overshoot and no steady state
error, presenting no cross-coupling in dynamic and steady-state responses
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
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ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
Low power cmos binary counter using conventional flip flopsIAEME Publication
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This document discusses low power CMOS binary counters. It proposes a clock gating technique for flip-flops to reduce power consumption in counters. It compares conventional non-clock gated, clock gated, and the proposed conditionally pulsed clock gating flip-flop designs. Simulation results in 0.18um CMOS technology show the proposed technique reduces power by 12% over conventional clock gating. Synchronous counters are chosen over asynchronous ones for their ability to scale to more bits with less delay per bit, important for reducing leakage power in high leakage technologies.
One dimensional cutting stock problem 1-d-csp_ a study on data dependent triIAEME Publication
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This document discusses a mathematical model for minimizing trim loss in the one-dimensional cutting stock problem (1D-CSP). The model considers order lengths that need to be cut from stock lengths of raw materials. It defines the concepts of first-order and second-order sustainable trims, which represent thresholds for the maximum allowable trim at each cutting stage. Linear approximations are constructed to predict the total trim loss for any set of input data, based on computing trim losses corresponding to the sustainable trim thresholds. The model aims to provide a practical solution for industries like manufacturing transmission towers that deal with 1D-CSP.
Fuzzy logic Control & Minimizing Commutation Torque Ripple for Brushless DC M...Editor IJMTER
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Brushless dc motor still suffers from commutation torque ripple, which mainly depends
on speed and transient line current in the commutation interval. This paper presents a novel circuit
topology and a dc link voltage control strategy to keep incoming and outgoing phase currents
changing at the same rate during commutation. A dcâdc single-ended primary inductor converter
(SEPIC) and a switch selection circuit are employed in front of the inverter. The desired
commutation voltage is accomplished by the SEPIC converter. The dc link voltage control strategy is
carried out by the switch selection circuit to separate two procedures, adjusting the SEPIC converter
and regulating speed. The cause of commutation ripple is analyzed, and the way to obtain the desired
dc link voltage is introduced in detail. Finally, simulation and experimental results show that,
compared with the dcâdc converter, the proposed method can obtain the desired voltage much faster
and minimize commutation torque ripple more efficiently at both high and low speeds and the closed
loop control is achieved by Fuzzy logic control.
This document summarizes a research paper on sensorless direct torque control of interior permanent magnet synchronous motors for embedded systems using an MRAS observer. It begins with an introduction to embedded systems and IPMSMs. It then provides the mathematical model of an IPMSM and describes the principles of direct torque control, including flux and torque hysteresis controllers and the inverter switching table. It presents an MRAS observer as a sensorless closed-loop algorithm for estimating rotor speed and position. In the simulation results, the proposed sensorless DTC control method using an MRAS observer is effective for embedded system applications.
DTC Scheme for a Four-Switch Inverter-Fed PMBLDC Motor Emulating the Six-Swit...IJRST Journal
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The paper deals with the direct torque control (DTC) of brushless DC (BLDC) motor drives fed by four-switch three phase inverters (FSTPI) rather than six-switch inverters (SSTPI) in conventional drives. For any three phase inverter require six switches, but these switches are reduced to four. This reduction of power switches from six to four improves the reliability of the inverter, size of the inverter is reduced and cost of the inverter is also reduces. The FSTPI could be regarded as a reconfigured topology of the SSTPI in case of a switch/leg failure which represents a crucial reliability benefit for many applications especially in electric and hybrid propulsion systems. The DTC of FSTPI-fed BLDC motor drives is treated considering two strategies, such as: 1) DTC-1: a strategy inspired from the one intended to SSTPI-fed BLDC motor drives; 2) DTC-2: a strategy that considers a dedicated vector selection subtable in order to independently control the torques developed by the phases connected to the FSTPI legs during their simultaneous conduction. The operational principle of the four-switch BLDC motor drive and the developed control scheme are theoretically analyzed and the performance is demonstrated by simulation.
This document presents a study on implementing field oriented control of a three-phase induction motor drive using a digital signal processor. The control algorithm is developed using Code Composer Studio and implemented on a TMS320F2812 digital signal processor board. Field oriented control is achieved using an indirect vector control scheme with an inner current control loop and outer speed control loop using PI controllers. Space vector pulse width modulation is used to generate switching signals for the voltage source inverter driving the motor. Experimental results show the motor speed is able to track different speed commands while responding well to load disturbances.
Vf control of three phase induction motor drive with different pwm techniquesAlexander Decker
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This document discusses different pulse width modulation (PWM) techniques for controlling a three-phase induction motor, including sine triangle PWM (SPWM), third-harmonic PWM (THPWM), and space vector PWM (SVPWM). It simulates these techniques using MATLAB Simulink and compares their performance in terms of total harmonic distortion, output voltage harmonics, motor speed control, and efficiency. The results show that SVPWM provides superior performance with less harmonic distortion and higher utilization of the DC supply voltage. SVPWM also allows improved dynamic response when the induction motor is subjected to changes in reference speed or load torque. In conclusion, SVPWM is deemed the most efficient modulation technique for closed-loop control of induction motor drive systems
In the proposed approach,instead of a conventional 3- Phase inverter a component minimized single pha se inverter is utilized which reduces the cost of the inverter,th e switching losses,and the complexity of interface circuits to generate logic signals. A performance comparison of the prop osed inverter fed drive with a conventional 3Phase inverter fed drive is also mode in terms of speed response and t otal harmonic distortion (THD) of the stator curren t. The proposed inverter fed IM drive is found acceptable consideri ng its cost reduction and other advantageous featur es. A general pulse width modulation (PWM) method for c ontrol of 1-phase inverters is presented. The vecto r PWM offers a simple method to select three or four vectors tha t effectively synthesize the desired output voltage,even in presence of voltage oscillations across the two dc-link capacit ors. The influence of different switching patterns on output voltage symmetry,current waveform,switching frequency and common mode voltage can be examined. The paper als o discusses how the use of the wye and delta connecti ons of the motor windings affects the implementatio n of the pulse width modulator.
Performance evolution of a PMSG based WECS using maximum power point tracking...theijes
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The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Brushless DC motor Drive during Speed regulation with Current ControllerIJERA Editor
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Brushless DC Motor (BLDC) is one of the best electrical drives that have increasing popularity, due to their
high efficiency, reliability, good dynamic response and very low maintenance. Due to the increasing demand for
compact & reliable motors and the evolution of low cost power semiconductor switches and permanent magnet
(PM) materials, brushless DC motors become popular in every application from home appliances to aerospace
industry. The conventional techniques for controlling the stator phase current in a brushless DC drive are
practically effective in low speed and cannot reduce the commutation torque ripple in high speed range. This
paper presents the PI controller for speed control of BLDC motor. The output of the PI controllers is summed
and is given as the input to the current controller. The BLDC motor is fed from the inverter where the rotor
position and current controller is the input. The complete model of the proposed drive system is developed and
simulated using MATLAB/Simulink software. The operation principle of using component is analysed and the
simulation results are presented in this to verify the theoretical analysis.
To Study, Analysis and Implementation of Power Quality Improvement Using DSTA...ijtsrd
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This project illustrates the execution of a three stage delivery static compensator DSTATCOM by using a back propagation BP control algorithm for its capacities, such as load balancing and zero voltage management of reactive power compensation under non linear loads. We use BP based control algorithm to obtain the critical dynamic weight estimate here. And the BP based control algorithm is often used for estimating the receptive power portions of the load streams necessary for estimating the reference source streams. Regulation of power efficiency devices through neural networks is the new area of study in the field of power engineering. The extraction of the harmonic components defines the output of the balancing instruments. Here we use DSTATCOM and UPFC as balancing instruments. A DSTATCOM model is developed using a computerized signal processor and its implementation is focused on various working conditions. The execution of DSTATCOM is found to be suitable for various kinds of burdens with the proposed control algorithm. The BP based control algorithm is used to derive the fundamental weighted value of the active and reactive power components of the load present. Back propagation algorithm trained by the sample will detect the power quality signal issue in real time. Continuity, differentiability, non decreasing momotomy are the key features of this algorithm. The process of UPFC is close to that of DSTATCOM, although the only difference is that it does not have the device shut down in worse circumstances. The simulation model is developed with ANFIS and its output is studied under different operating conditions. The output of ANFIS is found to be satisfactory with the proposed control algorithm for different types of loads. The suggested method shall be checked by the results of MATLAB Simulink. Rohit Mishra | Ashish Bhargava "To Study, Analysis and Implementation of Power Quality Improvement Using DSTATCOM with ANN (Back Propagation Algorithm)" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47521.pdf Paper URL : https://www.ijtsrd.com/engineering/electrical-engineering/47521/to-study-analysis-and-implementation-of-power-quality-improvement-using-dstatcom-with-ann-back-propagation-algorithm/rohit-mishra
This document analyzes the performance and control of a brushless doubly fed reluctance machine (BDFRM). It presents the transient and steady-state governing equations of the BDFRM and describes a speed control scheme based on field orientation control. It studies the start-up behavior and effects of control winding voltage and frequency on machine performance through digital simulation. The document aims to predict dynamic and steady-state performance, demonstrate important operational aspects, study start-up and synchronization under voltage/frequency control, and develop a control technique for wide speed control.
IRJET - Improvement of Power Factor and Efficiency of Three Phase Inducti...IRJET Journal
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This document summarizes a research paper that investigates improving the power factor and efficiency of a three-phase induction motor through extinction angle control. It begins with an abstract that outlines using insulated-gate bipolar transistors (IGBTs) and diodes in a power circuit to generate extinction pulses and attaching this circuit to each phase of an induction motor drive. It then provides background on using advanced control techniques in power converters to improve system efficiency. The document describes the basic block diagram and control circuit used to generate gate pulses for the IGBT switches. It explains the operation involves three modes - active, dead time, and freewheeling - to efficiently deliver power to the motor load. The research aims to simultaneously improve both
This document discusses using an artificial neural network (ANN) for speed and torque control of a three-phase induction motor. It proposes a new ANN-based method for flux position estimation, sector selection, and voltage vector selection for direct torque control of induction motors. Simulation and experimental results show the ANN-based approach reduces torque and flux ripples compared to conventional direct torque control. The ANN-based speed controller also achieves good dynamic performance of the induction motor drive. Results indicate the ANN-based direct torque control scheme has better performance than the modified direct torque control scheme.
Improved Torque Control Performance in Direct Torque Control using Optimal Sw...IJPEDS-IAES
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This paper presents the significant improvement of Direct Torque Control (DTC) of 3-phases induction machine using a Cascaded H- Bidge Multilevel Inverter (CHMI). The largest torque ripple and variable switching frequency are known as the major problem founded in DTC of induction motor. As a result, it can diminish the performance induction motor control. Therefore, the conventional 2- level inverter has been replaced with CHMI the in order to increase the performance of the motor either in dynamic or steady-state condition. By using the multilevel inverter, it can produce a more selection of the voltage vectors. Besides that, it can minimize the torque ripple output as well as increase the efficiency by reducing the switching frequency of the inverter. The simulation model of the proposed method has been developed and tested by using Matlab software. Its improvements were also verified via experimental results.
Speed Control System of Induction Motor by using Direct Torque Control Method...ijtsrd
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Escalator is useful and act in the important part to carry passengers to the targeted floors of building. Every escalator must be driven by its own motor and this motor speed must be controled. To drive escalator with a constant speed, direct torque control technique is used to drive three phase squirrel cage induction motor. In this paper, the development of speed control system for three phase squirrel cage induction motor using a direct torque control method is presented and simulation for proposed system is done with the help of MATLAB SIMULINK. Soe Sandar Aung | Thet Naing Htun "Speed Control System of Induction Motor by using Direct Torque Control Method used in Escalator" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27903.pdfPaper URL: https://www.ijtsrd.com/engineering/electrical-engineering/27903/speed-control-system-of-induction-motor-by-using-direct-torque-control-method-used-in-escalator/soe-sandar-aung
This document presents a new sensorless commutation method for brushless DC motors. The key features of the proposed method are:
1) It extracts commutation signals directly from average line-to-line motor terminal voltages using simple RC filters and comparators, without needing phase shift circuits, motor neutral voltage measurements, or AD converters.
2) In contrast to conventional methods that detect back EMF zero crossings, the proposed method's commutation signals are in phase with ideal timing and insensitive to common mode noise.
3) Experimental results over a wide speed range show the proposed method provides satisfactory sensorless control performance while achieving significantly lower cost than conventional techniques.
Optimization of controlling of performance characteristics of induction moIAEME Publication
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This document summarizes an article from the International Journal of Electrical Engineering and Technology that proposes a fuzzy logic based online efficiency optimization control for an indirect vector controlled induction motor drive system. The control aims to minimize input power by decrementing rotor flux until the lowest power point is reached. This is done without requiring knowledge of motor parameters and is insensitive to parameter changes. Fast convergence is achieved using an adaptive excitation current step size, and low frequency torque pulsations are suppressed via feedforward compensation. The control scheme is described and mathematical models of the induction motor, electrical systems, and mechanical systems are provided.
Design of Electric Drive for Vehicular Application Using Vector ControlIOSR Journals
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This document describes the design of an electric drive system for a vehicular application using vector control. It proposes an induction motor fed by a three-phase voltage source inverter whose input comes from a boost converter. Indirect vector control is chosen as the control scheme due to its ability to provide fast and accurate torque control without needing rotor position sensors. Simulation results show the motor is able to achieve speed control within 2.5 seconds with less than 4% deviation from the reference speed.
Novel Direct Switching Power Control Method of UPFC by Using Matrix Converte...IJMER
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This paper presents a direct Switching power control for three-phase matrix converters
operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac
power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has
reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical
principles of direct Switching power control based on sliding mode control techniques are established
for an MC-UPFC dynamic model including the input filter. As a result, line active and reactive power,
together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix
converter switching state guaranteeing good steady-state and dynamic responses. Experimental results
of DSPC controllers for MC-UPFC show decoupled active and reactive power control, zero steady-state
tracking error, and fast response times. Compared to an MC-UPFC using active and reactive power
linear controllers based on a modified Venturing high-frequency PWM modulator, the experimental
results of the advanced DSPC-MC guarantee faster responses without overshoot and no steady state
error, presenting no cross-coupling in dynamic and steady-state responses
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
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ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
Low power cmos binary counter using conventional flip flopsIAEME Publication
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This document discusses low power CMOS binary counters. It proposes a clock gating technique for flip-flops to reduce power consumption in counters. It compares conventional non-clock gated, clock gated, and the proposed conditionally pulsed clock gating flip-flop designs. Simulation results in 0.18um CMOS technology show the proposed technique reduces power by 12% over conventional clock gating. Synchronous counters are chosen over asynchronous ones for their ability to scale to more bits with less delay per bit, important for reducing leakage power in high leakage technologies.
One dimensional cutting stock problem 1-d-csp_ a study on data dependent triIAEME Publication
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This document discusses a mathematical model for minimizing trim loss in the one-dimensional cutting stock problem (1D-CSP). The model considers order lengths that need to be cut from stock lengths of raw materials. It defines the concepts of first-order and second-order sustainable trims, which represent thresholds for the maximum allowable trim at each cutting stage. Linear approximations are constructed to predict the total trim loss for any set of input data, based on computing trim losses corresponding to the sustainable trim thresholds. The model aims to provide a practical solution for industries like manufacturing transmission towers that deal with 1D-CSP.
Design and implementation of advanced security system based on one time passwIAEME Publication
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This document describes the design and implementation of an advanced security system based on one-time passwords for highly secure areas. The system uses multiple sensors including PIR, IR, vibration, and magnetic sensors to detect intrusions. When a sensor is triggered, the system requests a one-time password that is sent to authorized users' mobile phones. The system is aimed at providing security for places like defense establishments, nuclear plants, and other secure facilities by only allowing access to those who can provide the correct one-time password.
Comparative analysis of multi stage cordic using micro rotation techniqIAEME Publication
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This document presents a comparative analysis of multi-stage CORDIC algorithms using a micro-rotation technique. It proposes a novel pipelined CORDIC architecture for generating sine and cosine values with improved speed and accuracy. The architecture uses a generalized micro-rotation selection technique to reduce iterations and a high-speed most-significant bit detection scheme to identify micro-rotations without complex search algorithms. Simulation results show the proposed pipelined CORDIC operates at 500MHz with 0.192 watts of power on a Xilinx Vertex4 FPGA, offering 51.9% lower delay and power compared to other approaches.
Mhd and heat transfer in a thin film over an unsteady stretching surface withIAEME Publication
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This document discusses heat transfer in a thin liquid film over an unsteady stretching surface. The flow is influenced by an external magnetic field and includes effects of viscous dissipation and non-uniform heat sources. Governing equations for momentum and energy are non-dimensionalized using similarity transformations, reducing them to a system of nonlinear ordinary differential equations. These equations are solved numerically using Runge-Kutta shooting methods to obtain velocity and temperature profiles within the film. Results show the heat flux from the surface decreases with increasing unsteadiness for Prandtl numbers below 1 and increases for Prandtl numbers above 1.
Non symbolic base64 an effective representation of ipv6 addressIAEME Publication
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The document discusses the transition from IPv4 to IPv6 due to the depletion of IPv4 addresses. It proposes a new scheme called Effective and flexible representation Of IPv6 with Base64 to represent IPv6 addresses in a more compact notation of 28 bytes instead of the standard 39 bytes. This is done using the period as a delimiter instead of the colon in IPv6 addresses and using Base64 in a non-symbolic way. The scheme aims to address issues with long IPv6 addresses like memory usage, bandwidth and latency. Cloud computing will benefit from the more compact and user-friendly representation of IPv6 addresses.
Cfd analysis of turbulence in a gas turbine combustor with reference to the c...IAEME Publication
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This document discusses computational fluid dynamics (CFD) analysis of turbulence in a gas turbine combustor with reference to exit phenomena. It summarizes several studies that have used experimental and computational methods to model combustor exit profiles and their effects on secondary flows in turbine vanes. The document outlines CFD models of different combustor configurations, including variations in cooling schemes, dilution jets, and exit slots. Results show that dilution jets and exit slots can create non-uniformities in temperature, pressure and velocity at the combustor exit which influence the development of secondary flows in downstream vanes. Understanding these interactions is important for improving turbine performance and cooling effectiveness.
Employee retention in an organization through knowledge networkingIAEME Publication
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This document discusses employee retention through knowledge networking. It proposes that organizations can retain employees and reduce attrition by developing knowledge sharing networks. Such networks involve communities of people and knowledge that facilitate communication and knowledge transfer. When organizations implement transformational HR practices focused on talent management, trust, and personal/professional development through knowledge networking, it benefits both the organization and employees. The document provides an overview of knowledge, communities, knowledge networking, and the organizational processes involved in retention through knowledge sharing networks.
Art of fatigue analysis of helical compression spring used in twoIAEME Publication
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This document summarizes research on fatigue analysis of helical compression springs used in two-wheeler horns. It first reviews past literature on spring fatigue analysis and factors affecting spring reliability. It then describes the methodology used for analyzing and enhancing the life of two-wheeler horn springs, which includes obtaining spring specifications, creating CAD models, performing finite element analysis using NASTRAN and fatigue analysis using MSC Fatigue software. The analysis determined the maximum stress in the spring wire based on equations accounting for direct shear stress and torsional shear stress. Experimental testing verified the software results predicted the spring life to be infinite.
Performance Analysis Of Induction Motor For Voltage Mode And Current Mode Con...IRJET Journal
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This document discusses the performance analysis of an induction motor using voltage mode and current mode control. It compares hysteresis current control and space vector pulse width modulation (SVPWM). Hysteresis control directly limits current peaks but SVPWM provides higher voltage output and lower harmonic distortion. The document simulates an induction motor drive using SVPWM-based hysteresis current control in MATLAB. Key steps include Clark transformation to generate reference signals, switching between active and zero vectors to synthesize the reference signal, and using hysteresis control to generate PWM signals from current errors. Simulation results show the SVPWM controller provides good speed and current regulation for the induction motor.
A single rating inductor multilevel current source inverter with pwm strategieIAEME Publication
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This document summarizes a research paper about a single-rating inductor multilevel current source inverter (MCSI) topology that uses phase-shifted carrier pulse width modulation (PSC-SPWM) and space vector modulation (SVM) control strategies. The proposed MCSI consists of identical modules where each module uses two balance inductors and six switches to determine different current levels at the output. PSC-SPWM is implemented using a state machine approach to balance the current in the inductors while minimizing switching frequency. Simulation results show the performance of a seven-level, three-module arrangement of the proposed MCSI topology.
A new control methods for offshore grid connected wind energy conversion syst...IAEME Publication
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This document summarizes a new control method for an offshore wind energy conversion system using a doubly fed induction generator and Z-source inverter. Two control methods are proposed - capacitor voltage control and DC-link voltage control. Simulation results show that for capacitor voltage control, the rotor speed tracks the maximum power point, extracted mechanical power tracks maximum turbine power, and capacitor voltage is kept constant. The power delivered to the grid matches the extracted mechanical power. DC-link voltage control maintains a constant DC-link voltage while capacitor voltage and power outputs vary with shoot-through time. Capacitor voltage control regulates power transfer more effectively.
Performance Improvement of Multi Level Inverter fed Vector Controlled Inducti...IJPEDS-IAES
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In this paper, the analysis of space vector based multi level inverter (MLI) fed vector controlled induction motor drive for a low speed operation is presented. The performance of indirect field oriented controlled induction motor drive (IMD) is poor with two-level inverter for low speed operations (LSO). The reduction in performance and peak value of torque are mainly due to the non-linearity caused by stator voltage drop and inverter. Hence the performance factors of induction motor drive are analyzed with the multi level inverters under different operating conditions. In this approach, the steady state ripple content in the current and torque waveforms are reduced and that to ripple content of torque is reduced from 0.15 to 0.05 under steady state with five-level inverter. When there is a step change in the load torque, the momentary decrease in speed with five-level inverter is less when compared two and three-level inverters and the speed response reaches the reference value very quickly with five-level inverter during steady state and transient periods. So the overall performance of drive is improved with five- level inverter when compared to two-level and three- level inverters under low speed operations.
This document presents a new method for starting induction motors to improve transient torque pulsations. It develops a mathematical model of a 415V, 4.7A, 1435rpm induction motor in MATLAB/Simulink. The proposed method connects two phases (Y and B) at startup, with the third phase (R) delayed by 0.0133333 seconds. Simulations show this unbalanced startup reduces torque pulsations and starting current compared to normal startup. The method provides smooth motor acceleration and high starting torque with minimized transients, making it suitable for induction motor applications.
Implementation of d space controlled dpwm basedeSAT Journals
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Abstract The paper presents dSPACE controlled Induction motor drive fed through Discontinuous pulse width modulation (DPWM) algorithm based voltage source inverter. Two important performance measuring factors harmonic distortion in line current and dc bus utilization of the inverter can be improved with Discontinuous PWM approach in comparison with the popular conventional space vector (CSVPWM) approach; the paper contemplates on the implementation of DPWM algorithm for pulse generation which in turn are fed to intelligent power module that feeds the motor drive through DS1104 PPC603e / 250 MHz control desk. The results conclude the successful implementation of dSPACE Controlled induction motor drive. To validate the proposed work, numerical simulation including the experimental results is presented. Keywords:-DPWM, dSPACE, RTI
Study On Speed Control of DC MOTOR Using ThyristorIRJET Journal
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This document discusses speed control of a DC motor using a thyristor. It first provides background on DC motors and thyristors. It then presents the mathematical model of a separately excited DC motor. Various methods for controlling DC motor speed are described, including armature voltage control, armature resistance control, and flux control. Single phase half wave, full wave, and dual converter drives are introduced as techniques for implementing thyristor-based speed control. A simulation model is presented to observe the effect of varying the firing angle of a single phase full converter on the torque-speed characteristic of the DC motor. The document concludes that thyristor-based drives can effectively control DC motor speed.
Analysis of symmetrical & asymmetrical pwm based three phase ac to ac con...eSAT Journals
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Abstract
A Three phase bidirectional AC to AC buck converter circuit using power MOSFET operating in high frequency chopping mode is simulated and analyzed for electrical parameters such as output phase voltage, input line current, input power factor, harmonic profile and efficiency using MATLAB/simulink software package. The various PWM techniques such as symmetrical ramp-DC PWM (SRDPWM), asymmetrical ramp-triangular PWM (ARTPWM), asymmetrical sinusoidal PWM type-1 [ASPWM1] and asymmetrical sinusoidal PWM type-2 [ASPWM2] techniques are adopted to analyze the harmonic profile, input power factor and efficiency of the converter. The rms value of the output phase voltage, output line current and source current can be significantly increased by varying the duty ratio K in case of symmetrical PWM control strategy and modulation index MI in case of asymmetrical PWM control strategies independent of variation in switching frequency. It is observed from the simulation results that the ASPWM1 switching strategy gives more output phase voltage, input power factor, efficiency by increasing modulation index MI and reduced low order harmonics of output voltage and source current by increasing the number of pulses per half cycle P compared to other PWM techniques rendering easy and economical filteration.
Keywords: Three phase AC chopper, symmetrical ramp-DC PWM, asymmetrical ramp-triangular PWM, asymmetrical sinusoidal PWM technique, harmonic profile, power factor, efficiency
Analysis of symmetrical & asymmetrical pwm based three phase ac to ac con...eSAT Journals
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Abstract
A Three phase bidirectional AC to AC buck converter circuit using power MOSFET operating in high frequency chopping mode is simulated and analyzed for electrical parameters such as output phase voltage, input line current, input power factor, harmonic profile and efficiency using MATLAB/simulink software package. The various PWM techniques such as symmetrical ramp-DC PWM (SRDPWM), asymmetrical ramp-triangular PWM (ARTPWM), asymmetrical sinusoidal PWM type-1 [ASPWM1] and asymmetrical sinusoidal PWM type-2 [ASPWM2] techniques are adopted to analyze the harmonic profile, input power factor and efficiency of the converter. The rms value of the output phase voltage, output line current and source current can be significantly increased by varying the duty ratio K in case of symmetrical PWM control strategy and modulation index MI in case of asymmetrical PWM control strategies independent of variation in switching frequency. It is observed from the simulation results that the ASPWM1 switching strategy gives more output phase voltage, input power factor, efficiency by increasing modulation index MI and reduced low order harmonics of output voltage and source current by increasing the number of pulses per half cycle P compared to other PWM techniques rendering easy and economical filteration.
Keywords: Three phase AC chopper, symmetrical ramp-DC PWM, asymmetrical ramp-triangular PWM, asymmetrical sinusoidal PWM technique, harmonic profile, power factor, efficiency
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Simulation Investigation of SPWM, THIPWM and SVPWM Techniques for Three Phase...IJPEDS-IAES
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This document summarizes and compares three pulse width modulation techniques - sinusoidal PWM (SPWM), third harmonic injection PWM (THIPWM), and space vector PWM (SVPWM) - for a three-phase voltage source inverter. SPWM is the simplest technique but has drawbacks like higher total harmonic distortion and lower switching frequency. THIPWM provides better THD than SPWM. SVPWM shows lower THD than both SPWM and THIPWM, especially in overmodulation regions and at high frequencies. The document presents the theoretical principles, simulation models, and results of the three techniques, showing that SVPWM achieves the best performance and meets current harmonic standards.
IRJET - Three-Phase Single Switch PWM Controlled Induction Motor DriveIRJET Journal
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This document proposes a three-phase induction motor drive with a single controllable switch and PWM control. It aims to improve efficiency and power factor over existing variable frequency drives. The proposed drive uses a single switch and diodes to chop the three-phase AC voltage fed to the motor. Low value capacitors connected in parallel maintain current continuity in the motor windings during freewheeling. Motor speed can be varied by controlling the duty ratio of the PWM signal to the switch. Simulation results show the motor current remains in phase with the supply voltage, improving power factor compared to conventional angle control methods. The proposed drive is expected to provide higher efficiency operation of industrial fans, pumps and other loads with simplicity and low cost.
This document proposes an efficient solar powered induction motor drive system for water pumping applications. It uses a photovoltaic array, push-pull DC-DC boost converter, and three-phase inverter with the solar array as the energy source. Two PWM techniques, sinusoidal PWM and space vector PWM, are implemented and compared for the inverter switching. Incremental conductance algorithm is used for maximum power point tracking of the PV array. Simulation results in MATLAB/SIMULINK are presented to verify the effectiveness of the proposed design.
Alternating current (AC) electrical drives mainly require smaller current (or torque) ripples and lower total harmonic distortion (THD) of voltage for excellent drive performances. Normally, in practice, to achieve these requirements, the inverter needs to be operated at high switching frequency. By operating at high switching frequency, the size of filter can be reduced. However, the inverter which oftenly employs insulated gate bipolar transistor (IGBT) for high power applications cannot be operated at high switching frequency. This is because, the IGBT switching frequency cannot be operated above 50 kHz due to its thermal restrictions. This paper proposes an alternate switching strategy to enable the use of IGBT for operating the inverter at high switching frequency to improve THD performances. In this strategy, each IGBT in a group of switches in the modified inverter circuit will operate the switching frequency at one-fourth of the inverter switching frequency. The alternate switching is implemented using simple analog and digital integrated circuits.
Report On diode clamp three level inverterVinay Singh
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three level diode clamp inverter. that converts any type of DC ( rectified, PV cell, battery etc.) to AC supply. we made by mosfet and ardiuno . in this ppt we present the Simulink model of a three-level inverter and the hardware reort of the inverter.
also discuss about other level inverter and there THD analysis, simulink model and detail. compression between another inverter.
Analysis and Implementation of Unipolar PWM Strategies for Three Phase Cascad...IJAAS Team
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This paper presents unipolar pulse width modulation technique with sinusoidal sampling pulse width modulation are analyzed for three-phase five-level, seven-level, nine-level and eleven-level cascaded multi-level inverter. The unipolar PWM method offers a good opportunity for the realization of the Three-phase inverter control, it is better to use the unipolar PWM method with single carrier wave compared to two reference waves. In such case the motor harmonic losses will be considerably lower.The necessary calculations for generation of unipolar pulse width modulation strategies have presented in detail. The unipolar SPWM voltage switching scheme is selected in this paper because this method offers the advantages of effectively doubling the switching frequency of the inverter voltage. The cascaded multi level inverter fed induction motor is simulated and compared the total harmonic distroction for all level (five-level, seven-level, nine-level and elevel-level)of the inverter. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.
The Nine-Switch Inverter(NSI) is a recently developed dual output converter. It can be used to drive two three-phase loads independently. As a substitute to two separate conventional voltage source inverters, the NSI has been, already, proposed in various industrial applications to reduce the numberof semiconductor switches and its associated energy losses and drive circuitry. On the other hand, the Direct Torque Control(DTC) is a robust control scheme of AC motors, which consist of selecting proper state vectors of a conventional voltage source inverter. The NSI, having a different working principle from the conventional voltage source inverter and taking into account the varying influence of active space vectors on motorâs torque and stator flux, a Direct Torque Control is suggested in this paper to, efficiently, drive two induction motors independently, while minimizing the torque and stator flux ripples of both motors. Simulations results confirm the effectiveness of the proposed algorithm. In addition, application of this newly proposed control scheme in operation of an Electric Vehicule (EV) is demonstrated.
Simulation Of A 4-Switch,3-Phase Inverter Fed Induction Motor (IM) Drive Systemijiert bestjournal
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This document summarizes a research paper on simulating a 4-switch, 3-phase inverter driving an induction motor. It begins with an abstract describing the research goal of developing a more cost-effective induction motor drive using a 4-switch inverter instead of a conventional 6-switch inverter. It then provides details on the drive system components, the 4-switch inverter topology, a space vector pulse width modulation control approach, and simulation results showing the speed, torque and current characteristics meeting performance needs while reducing costs. The conclusion is that the 4-switch inverter fed induction motor drive is acceptable considering cost reduction without compromising operation.
Closed Loop Speed Control of a BLDC Motor Drive Using Adaptive Fuzzy Tuned PI...IJERA Editor
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Brushless DC Motors are widely used for many industrial applications because of their high efficiency, high
torque and low volume. This paper proposed an improved Adaptive Fuzzy PI controller to control the speed of
BLDC motor. This paper provides an overview of different tuning methods of PID Controller applied to control
the speed of the transfer function model of the BLDC motor drive and then to the mathematical model of the
BLDC motor drive. It is difficult to tune the parameters and get satisfied control characteristics by using normal
conventional PI controller. The experimental results verify that Adaptive Fuzzy PI controller has better control
performance than the conventional PI controller. The modeling, control and simulation of the BLDC motor have
been done using the MATLAB/SIMULINK software. Also, the dynamic characteristics of the BLDC motor (i.e.
speed and torque) as well as currents and voltages of the inverter components are observed by using the
developed model.
Comparative Analysis of PWM Techniques for Three Level Diode Clamped Voltage ...IAES-IJPEDS
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Multilevel inverters are increasingly being used in high-power medium voltage industrial drive applications due to their superior performance compared to conventional two-level inverters. Thre are a number of Pulse width modulation (PWM) techniques applied in recent years. The most widely applied PWM techniques are Sine Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM). SPWM is the most simple modulation technique that can realize easily in analog circuit. However, it has some drawbacks such as higher total harmonic distortion (THD), lower effective DC utilization and lower switching frequency. Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. The complexity is due to the difficulty in determining the reference vector location, on times calculation, and switching states selection. This paper presents a simple SVPWM algorithm for diode clamped three level inverters based on standard two-level SVPWM which can easily determine the location of reference vector, calculate the on-times, the selection of switching states. Three level diode clamped inverter (3LDCI) using space vector modulation technique has been modeled and simulated using MATLAB/SIMULINK and Origin 6.1 with a passive R-L load that can be extended to any level. Simulation results are presented to verify the proposed SVPWM control in terms of THD. The results arecompared with conventional sinusoidal pulse width modulation (SPWM) where SVPWM shows better performance than SPWM in terms of THD.
Similar to The scheme of three level inverters based on svpwm overmodulation technique (20)
Submission Deadline: 30th September 2022
Acceptance Notification: Within Three Daysâ time period
Online Publication: Within 24 Hrs. time Period
Expected Date of Dispatch of Printed Journal: 5th October 2022
MODELING AND ANALYSIS OF SURFACE ROUGHNESS AND WHITE LATER THICKNESS IN WIRE-...IAEME Publication
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White layer thickness (WLT) formed and surface roughness in wire electric discharge turning (WEDT) of tungsten carbide composite has been made to model through response surface methodology (RSM). A Taguchiâs standard Design of experiments involving five input variables with three levels has been employed to establish a mathematical model between input parameters and responses. Percentage of cobalt content, spindle speed, Pulse on-time, wire feed and pulse off-time were changed during the experimental tests based on the Taguchiâs orthogonal array L27 (3^13). Analysis of variance (ANOVA) revealed that the mathematical models obtained can adequately describe performance within the parameters of the factors considered. There was a good agreement between the experimental and predicted values in this study.
A STUDY ON THE REASONS FOR TRANSGENDER TO BECOME ENTREPRENEURSIAEME Publication
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The study explores the reasons for a transgender to become entrepreneurs. In this study transgender entrepreneur was taken as independent variable and reasons to become as dependent variable. Data were collected through a structured questionnaire containing a five point Likert Scale. The study examined the data of 30 transgender entrepreneurs in Salem Municipal Corporation of Tamil Nadu State, India. Simple Random sampling technique was used. Garrett Ranking Technique (Percentile Position, Mean Scores) was used as the analysis for the present study to identify the top 13 stimulus factors for establishment of trans entrepreneurial venture. Economic advancement of a nation is governed upon the upshot of a resolute entrepreneurial doings. The conception of entrepreneurship has stretched and materialized to the socially deflated uncharted sections of transgender community. Presently transgenders have smashed their stereotypes and are making recent headlines of achievements in various fields of our Indian society. The trans-community is gradually being observed in a new light and has been trying to achieve prospective growth in entrepreneurship. The findings of the research revealed that the optimistic changes are taking place to change affirmative societal outlook of the transgender for entrepreneurial ventureship. It also laid emphasis on other transgenders to renovate their traditional living. The paper also highlights that legislators, supervisory body should endorse an impartial canons and reforms in Tamil Nadu Transgender Welfare Board Association.
BROAD UNEXPOSED SKILLS OF TRANSGENDER ENTREPRENEURSIAEME Publication
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Since ages gender difference is always a debatable theme whether caused by nature, evolution or environment. The birth of a transgender is dreadful not only for the child but also for their parents. The pain of living in the wrong physique and treated as second class victimized citizen is outrageous and fully harboured with vicious baseless negative scruples. For so long, social exclusion had perpetuated inequality and deprivation experiencing ingrained malign stigma and besieged victims of crime or violence across their life spans. They are pushed into the murky way of life with a source of eternal disgust, bereft sexual potency and perennial fear. Although they are highly visible but very little is known about them. The common public needs to comprehend the ravaged arrogance on these insensitive souls and assist in integrating them into the mainstream by offering equal opportunity, treat with humanity and respect their dignity. Entrepreneurship in the current age is endorsing the gender fairness movement. Unstable careers and economic inadequacy had inclined one of the gender variant people called Transgender to become entrepreneurs. These tiny budding entrepreneurs resulted in economic transition by means of employment, free from the clutches of stereotype jobs, raised standard of living and handful of financial empowerment. Besides all these inhibitions, they were able to witness a platform for skill set development that ignited them to enter into entrepreneurial domain. This paper epitomizes skill sets involved in trans-entrepreneurs of Thoothukudi Municipal Corporation of Tamil Nadu State and is a groundbreaking determination to sightsee various skills incorporated and the impact on entrepreneurship.
DETERMINANTS AFFECTING THE USER'S INTENTION TO USE MOBILE BANKING APPLICATIONSIAEME Publication
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The banking and financial services industries are experiencing increased technology penetration. Among them, the banking industry has made technological advancements to better serve the general populace. The economy focused on transforming the banking sector's system into a cashless, paperless, and faceless one. The researcher wants to evaluate the user's intention for utilising a mobile banking application. The study also examines the variables affecting the user's behaviour intention when selecting specific applications for financial transactions. The researcher employed a well-structured questionnaire and a descriptive study methodology to gather the respondents' primary data utilising the snowball sampling technique. The study includes variables like performance expectations, effort expectations, social impact, enabling circumstances, and perceived risk. Each of the aforementioned variables has a major impact on how users utilise mobile banking applications. The outcome will assist the service provider in comprehending the user's history with mobile banking applications.
ANALYSE THE USER PREDILECTION ON GPAY AND PHONEPE FOR DIGITAL TRANSACTIONSIAEME Publication
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Technology upgradation in banking sector took the economy to view that payment mode towards online transactions using mobile applications. This system enabled connectivity between banks, Merchant and user in a convenient mode. there are various applications used for online transactions such as Google pay, Paytm, freecharge, mobikiwi, oxygen, phonepe and so on and it also includes mobile banking applications. The study aimed at evaluating the predilection of the user in adopting digital transaction. The study is descriptive in nature. The researcher used random sample techniques to collect the data. The findings reveal that mobile applications differ with the quality of service rendered by Gpay and Phonepe. The researcher suggest the Phonepe application should focus on implementing the application should be user friendly interface and Gpay on motivating the users to feel the importance of request for money and modes of payments in the application.
VOICE BASED ATM FOR VISUALLY IMPAIRED USING ARDUINOIAEME Publication
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The prototype of a voice-based ATM for visually impaired using Arduino is to help people who are blind. This uses RFID cards which contain users fingerprint encrypted on it and interacts with the users through voice commands. ATM operates when sensor detects the presence of one person in the cabin. After scanning the RFID card, it will ask to select the mode like ânormal or blind. User can select the respective mode through voice input, if blind mode is selected the balance check or cash withdraw can be done through voice input. Normal mode procedure is same as the existing ATM.
IMPACT OF EMOTIONAL INTELLIGENCE ON HUMAN RESOURCE MANAGEMENT PRACTICES AMONG...IAEME Publication
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There is increasing acceptability of emotional intelligence as a major factor in personality assessment and effective human resource management. Emotional intelligence as the ability to build capacity, empathize, co-operate, motivate and develop others cannot be divorced from both effective performance and human resource management systems. The human person is crucial in defining organizational leadership and fortunes in terms of challenges and opportunities and walking across both multinational and bilateral relationships. The growing complexity of the business world requires a great deal of self-confidence, integrity, communication, conflict and diversity management to keep the global enterprise within the paths of productivity and sustainability. Using the exploratory research design and 255 participants the result of this original study indicates strong positive correlation between emotional intelligence and effective human resource management. The paper offers suggestions on further studies between emotional intelligence and human capital development and recommends for conflict management as an integral part of effective human resource management.
VISUALISING AGING PARENTS & THEIR CLOSE CARERS LIFE JOURNEY IN AGING ECONOMYIAEME Publication
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Our life journey, in general, is closely defined by the way we understand the meaning of why we coexist and deal with its challenges. As we develop the "inspiration economy", we could say that nearly all of the challenges we have faced are opportunities that help us to discover the rest of our journey. In this note paper, we explore how being faced with the opportunity of being a close carer for an aging parent with dementia brought intangible discoveries that changed our insight of the meaning of the rest of our life journey.
A STUDY ON THE IMPACT OF ORGANIZATIONAL CULTURE ON THE EFFECTIVENESS OF PERFO...IAEME Publication
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The main objective of this study is to analyze the impact of aspects of Organizational Culture on the Effectiveness of the Performance Management System (PMS) in the Health Care Organization at Thanjavur. Organizational Culture and PMS play a crucial role in present-day organizations in achieving their objectives. PMS needs employeesâ cooperation to achieve its intended objectives. Employees' cooperation depends upon the organizationâs culture. The present study uses exploratory research to examine the relationship between the Organization's culture and the Effectiveness of the Performance Management System. The study uses a Structured Questionnaire to collect the primary data. For this study, Thirty-six non-clinical employees were selected from twelve randomly selected Health Care organizations at Thanjavur. Thirty-two fully completed questionnaires were received.
Living in 21st century in itself reminds all of us the necessity of police and its administration. As more and more we are entering into the modern society and culture, the more we require the services of the so called âKhaki Worthyâ men i.e., the police personnel. Whether we talk of Indian police or the other nationâs police, they all have the same recognition as they have in India. But as already mentioned, their services and requirements are different after the like 26th November, 2008 incidents, where they without saving their own lives has sacrificed themselves without any hitch and without caring about their respective family members and wards. In other words, they are like our heroes and mentors who can guide us from the darkness of fear, militancy, corruption and other dark sides of life and so on. Now the question arises, if Gandhi would have been alive today, what would have been his reaction/opinion to the police and its functioning? Would he have some thing different in his mind now what he had been in his mind before the partition or would he be going to start some Satyagraha in the form of some improvement in the functioning of the police administration? Really these questions or rather night mares can come to any oneâs mind, when there is too much confusion is prevailing in our minds, when there is too much corruption in the society and when the polices working is also in the questioning because of one or the other case throughout the India. It is matter of great concern that we have to thing over our administration and our practical approach because the police personals are also like us, they are part and parcel of our society and among one of us, so why we all are pin pointing towards them.
A STUDY ON TALENT MANAGEMENT AND ITS IMPACT ON EMPLOYEE RETENTION IN SELECTED...IAEME Publication
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The goal of this study was to see how talent management affected employee retention in the selected IT organizations in Chennai. The fundamental issue was the difficulty to attract, hire, and retain talented personnel who perform well and the gap between supply and demand of talent acquisition and retaining them within the firms. The study's main goals were to determine the impact of talent management on employee retention in IT companies in Chennai, investigate talent management strategies that IT companies could use to improve talent acquisition, performance management, career planning and formulate retention strategies that the IT firms could use. The respondents were given a structured close-ended questionnaire with the 5 Point Likert Scale as part of the study's quantitative research design. The target population consisted of 289 IT professionals. The questionnaires were distributed and collected by the researcher directly. The Statistical Package for Social Sciences (SPSS) was used to collect and analyse the questionnaire responses. Hypotheses that were formulated for the various areas of the study were tested using a variety of statistical tests. The key findings of the study suggested that talent management had an impact on employee retention. The studies also found that there is a clear link between the implementation of talent management and retention measures. Management should provide enough training and development for employees, clarify job responsibilities, provide adequate remuneration packages, and recognise employees for exceptional performance.
ATTRITION IN THE IT INDUSTRY DURING COVID-19 PANDEMIC: LINKING EMOTIONAL INTE...IAEME Publication
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Globally, Millions of dollars were spent by the organizations for employing skilled Information Technology (IT) professionals. It is costly to replace unskilled employees with IT professionals possessing technical skills and competencies that aid in interconnecting the business processes. The organizationâs employment tactics were forced to alter by globalization along with technological innovations as they consistently diminish to remain lean, outsource to concentrate on core competencies along with restructuring/reallocate personnel to gather efficiency. As other jobs, organizations or professions have become reasonably more appropriate in a shifting employment landscape, the above alterations trigger both involuntary as well as voluntary turnover. The employee view on jobs is also afflicted by the COVID-19 pandemic along with the employee-driven labour market. So, having effective strategies is necessary to tackle the withdrawal rate of employees. By associating Emotional Intelligence (EI) along with Talent Management (TM) in the IT industry, the rise in attrition rate was analyzed in this study. Only 303 respondents were collected out of 350 participants to whom questionnaires were distributed. From the employees of IT organizations located in Bangalore (India), the data were congregated. A simple random sampling methodology was employed to congregate data as of the respondents. Generating the hypothesis along with testing is eventuated. The effect of EI and TM along with regression analysis between TM and EI was analyzed. The outcomes indicated that employee and Organizational Performance (OP) were elevated by effective EI along with TM.
INFLUENCE OF TALENT MANAGEMENT PRACTICES ON ORGANIZATIONAL PERFORMANCE A STUD...IAEME Publication
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By implementing talent management strategy, organizations would have the option to retain their skilled professionals while additionally working on their overall performance. It is the course of appropriately utilizing the ideal individuals, setting them up for future top positions, exploring and dealing with their performance, and holding them back from leaving the organization. It is employee performance that determines the success of every organization. The firm quickly obtains an upper hand over its rivals in the event that its employees having particular skills that cannot be duplicated by the competitors. Thus, firms are centred on creating successful talent management practices and processes to deal with the unique human resources. Firms are additionally endeavouring to keep their top/key staff since on the off chance that they leave; the whole store of information leaves the firm's hands. The study's objective was to determine the impact of talent management on organizational performance among the selected IT organizations in Chennai. The study recommends that talent management limitedly affects performance. On the off chance that this talent is appropriately management and implemented properly, organizations might benefit as much as possible from their maintained assets to support development and productivity, both monetarily and non-monetarily.
A STUDY OF VARIOUS TYPES OF LOANS OF SELECTED PUBLIC AND PRIVATE SECTOR BANKS...IAEME Publication
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Banking regulations act of India, 1949 defines banking as âacceptance of deposits for the purpose of lending or investment from the public, repayment on demand or otherwise and withdrawable through cheques, drafts order or otherwiseâ, the major participants of the Indian financial system are commercial banks, the financial institution encompassing term lending institutions. Investments institutions, specialized financial institution and the state level development banks, non banking financial companies (NBFC) and other market intermediaries such has the stock brokers and money lenders are among the oldest of the certain variants of NBFC and the oldest market participants. The asset quality of banks is one of the most important indicators of their financial health. The Indian banking sector has been facing severe problems of increasing Non- Performing Assets (NPAs). The NPAs growth directly and indirectly affects the quality of assets and profitability of banks. It also shows the efficiency of banks credit risk management and the recovery effectiveness. NPA do not generate any income, whereas, the bank is required to make provisions for such as assets that why is a double edge weapon. This paper outlines the concept of quality of bank loans of different types like Housing, Agriculture and MSME loans in state Haryana of selected public and private sector banks. This study is highlighting problems associated with the role of commercial bank in financing Small and Medium Scale Enterprises (SME). The overall objective of the research was to assess the effect of the financing provisions existing for the setting up and operations of MSMEs in the country and to generate recommendations for more robust financing mechanisms for successful operation of the MSMEs, in turn understanding the impact of MSME loans on financial institutions due to NPA. There are many research conducted on the topic of Non- Performing Assets (NPA) Management, concerning particular bank, comparative study of public and private banks etc. In this paper the researcher is considering the aggregate data of selected public sector and private sector banks and attempts to compare the NPA of Housing, Agriculture and MSME loans in state Haryana of public and private sector banks. The tools used in the study are average and Anova test and variance. The findings reveal that NPA is common problem for both public and private sector banks and is associated with all types of loans either that is housing loans, agriculture loans and loans to SMES. NPAs of both public and private sector banks show the increasing trend. In 2010-11 GNPA of public and private sector were at same level it was 2% but after 2010-11 it increased in many fold and at present there is GNPA in some more than 15%. It shows the dark area of Indian banking sector.
EXPERIMENTAL STUDY OF MECHANICAL AND TRIBOLOGICAL RELATION OF NYLON/BaSO4 POL...IAEME Publication
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An experiment conducted in this study found that BaSO4 changed Nylon 6's mechanical properties. By changing the weight ratios, BaSO4 was used to make Nylon 6. This Researcher looked into how hard Nylon-6/BaSO4 composites are and how well they wear. Experiments were done based on Taguchi design L9. Nylon-6/BaSO4 composites can be tested for their hardness number using a Rockwell hardness testing apparatus. On Nylon/BaSO4, the wear behavior was measured by a wear monitor, pinon-disc friction by varying reinforcement, sliding speed, and sliding distance, and the microstructure of the crack surfaces was observed by SEM. This study provides significant contributions to ultimate strength by increasing BaSO4 content up to 16% in the composites, and sliding speed contributes 72.45% to the wear rate
ROLE OF SOCIAL ENTREPRENEURSHIP IN RURAL DEVELOPMENT OF INDIA - PROBLEMS AND ...IAEME Publication
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The majority of the population in India lives in villages. The village is the back bone of the country. Village or rural industries play an important role in the national economy, particularly in the rural development. Developing the rural economy is one of the key indicators towards a countryâs success. Whether it be the need to look after the welfare of the farmers or invest in rural infrastructure, Governments have to ensure that rural development isnât compromised. The economic development of our country largely depends on the progress of rural areas and the standard of living of rural masses. Village or rural industries play an important role in the national economy, particularly in the rural development. Rural entrepreneurship is based on stimulating local entrepreneurial talent and the subsequent growth of indigenous enterprises. It recognizes opportunity in the rural areas and accelerates a unique blend of resources either inside or outside of agriculture. Rural entrepreneurship brings an economic value to the rural sector by creating new methods of production, new markets, new products and generate employment opportunities thereby ensuring continuous rural development. Social Entrepreneurship has the direct and primary objective of serving the society along with the earning profits. So, social entrepreneurship is different from the economic entrepreneurship as its basic objective is not to earn profits but for providing innovative solutions to meet the society needs which are not taken care by majority of the entrepreneurs as they are in the business for profit making as a sole objective. So, the Social Entrepreneurs have the huge growth potential particularly in the developing countries like India where we have huge societal disparities in terms of the financial positions of the population. Still 22 percent of the Indian population is below the poverty line and also there is disparity among the rural & urban population in terms of families living under BPL. 25.7 percent of the rural population & 13.7 percent of the urban population is under BPL which clearly shows the disparity of the poor people in the rural and urban areas. The need to develop social entrepreneurship in agriculture is dictated by a large number of social problems. Such problems include low living standards, unemployment, and social tension. The reasons that led to the emergence of the practice of social entrepreneurship are the above factors. The research problem lays upon disclosing the importance of role of social entrepreneurship in rural development of India. The paper the tendencies of social entrepreneurship in India, to present successful examples of such business for providing recommendations how to improve situation in rural areas in terms of social entrepreneurship development. Indian government has made some steps towards development of social enterprises, social entrepreneurship, and social in- novation, but a lot remains to be improved.
OPTIMAL RECONFIGURATION OF POWER DISTRIBUTION RADIAL NETWORK USING HYBRID MET...IAEME Publication
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Distribution system is a critical link between the electric power distributor and the consumers. Most of the distribution networks commonly used by the electric utility is the radial distribution network. However in this type of network, it has technical issues such as enormous power losses which affect the quality of the supply. Nowadays, the introduction of Distributed Generation (DG) units in the system help improve and support the voltage profile of the network as well as the performance of the system components through power loss mitigation. In this study network reconfiguration was done using two meta-heuristic algorithms Particle Swarm Optimization and Gravitational Search Algorithm (PSO-GSA) to enhance power quality and voltage profile in the system when simultaneously applied with the DG units. Backward/Forward Sweep Method was used in the load flow analysis and simulated using the MATLAB program. Five cases were considered in the Reconfiguration based on the contribution of DG units. The proposed method was tested using IEEE 33 bus system. Based on the results, there was a voltage profile improvement in the system from 0.9038 p.u. to 0.9594 p.u.. The integration of DG in the network also reduced power losses from 210.98 kW to 69.3963 kW. Simulated results are drawn to show the performance of each case.
APPLICATION OF FRUGAL APPROACH FOR PRODUCTIVITY IMPROVEMENT - A CASE STUDY OF...IAEME Publication
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Manufacturing industries have witnessed an outburst in productivity. For productivity improvement manufacturing industries are taking various initiatives by using lean tools and techniques. However, in different manufacturing industries, frugal approach is applied in product design and services as a tool for improvement. Frugal approach contributed to prove less is more and seems indirectly contributing to improve productivity. Hence, there is need to understand status of frugal approach application in manufacturing industries. All manufacturing industries are trying hard and putting continuous efforts for competitive existence. For productivity improvements, manufacturing industries are coming up with different effective and efficient solutions in manufacturing processes and operations. To overcome current challenges, manufacturing industries have started using frugal approach in product design and services. For this study, methodology adopted with both primary and secondary sources of data. For primary source interview and observation technique is used and for secondary source review has done based on available literatures in website, printed magazines, manual etc. An attempt has made for understanding application of frugal approach with the study of manufacturing industry project. Manufacturing industry selected for this project study is Mahindra and Mahindra Ltd. This paper will help researcher to find the connections between the two concepts productivity improvement and frugal approach. This paper will help to understand significance of frugal approach for productivity improvement in manufacturing industry. This will also help to understand current scenario of frugal approach in manufacturing industry. In manufacturing industries various process are involved to deliver the final product. In the process of converting input in to output through manufacturing process productivity plays very critical role. Hence this study will help to evolve status of frugal approach in productivity improvement programme. The notion of frugal can be viewed as an approach towards productivity improvement in manufacturing industries.
A MULTIPLE â CHANNEL QUEUING MODELS ON FUZZY ENVIRONMENTIAEME Publication
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In this paper, we investigated a queuing model of fuzzy environment-based a multiple channel queuing model (M/M/C) ( ï„ /FCFS) and study its performance under realistic conditions. It applies a nonagonal fuzzy number to analyse the relevant performance of a multiple channel queuing model (M/M/C) ( ï„ /FCFS). Based on the sub interval average ranking method for nonagonal fuzzy number, we convert fuzzy number to crisp one. Numerical results reveal that the efficiency of this method. Intuitively, the fuzzy environment adapts well to a multiple channel queuing models (M/M/C) ( ï„ /FCFS) are very well.
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
Monitoring and Managing Anomaly Detection on OpenShift.pdfTosin Akinosho
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Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
1. Introduction to Anomaly Detection
- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
2. Understanding Edge (IoT)
- Learn about edge computing and IoT, and how they enable real-time data processing and decision-making at the source.
3. What is ArgoCD?
- Discover ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes, and its role in deploying applications on edge devices.
4. Deployment Using ArgoCD for Edge Devices
- Step-by-step guide on deploying anomaly detection models on edge devices using ArgoCD.
5. Introduction to Apache Kafka and S3
- Explore Apache Kafka for real-time data streaming and Amazon S3 for scalable storage solutions.
6. Viewing Kafka Messages in the Data Lake
- Learn how to view and analyze Kafka messages stored in a data lake for better insights.
7. What is Prometheus?
- Get to know Prometheus, an open-source monitoring and alerting toolkit, and its application in monitoring edge devices.
8. Monitoring Application Metrics with Prometheus
- Detailed instructions on setting up Prometheus to monitor the performance and health of your anomaly detection system.
9. What is Camel K?
- Introduction to Camel K, a lightweight integration framework built on Apache Camel, designed for Kubernetes.
10. Configuring Camel K Integrations for Data Pipelines
- Learn how to configure Camel K for seamless data pipeline integrations in your anomaly detection workflow.
11. What is a Jupyter Notebook?
- Overview of Jupyter Notebooks, an open-source web application for creating and sharing documents with live code, equations, visualizations, and narrative text.
12. Jupyter Notebooks with Code Examples
- Hands-on examples and code snippets in Jupyter Notebooks to help you implement and test anomaly detection models.
AppSec PNW: Android and iOS Application Security with MobSFAjin Abraham
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Mobile Security Framework - MobSF is a free and open source automated mobile application security testing environment designed to help security engineers, researchers, developers, and penetration testers to identify security vulnerabilities, malicious behaviours and privacy concerns in mobile applications using static and dynamic analysis. It supports all the popular mobile application binaries and source code formats built for Android and iOS devices. In addition to automated security assessment, it also offers an interactive testing environment to build and execute scenario based test/fuzz cases against the application.
This talk covers:
Using MobSF for static analysis of mobile applications.
Interactive dynamic security assessment of Android and iOS applications.
Solving Mobile app CTF challenges.
Reverse engineering and runtime analysis of Mobile malware.
How to shift left and integrate MobSF/mobsfscan SAST and DAST in your build pipeline.
How information systems are built or acquired puts information, which is what they should be about, in a secondary place. Our language adapted accordingly, and we no longer talk about information systems but applications. Applications evolved in a way to break data into diverse fragments, tightly coupled with applications and expensive to integrate. The result is technical debt, which is re-paid by taking even bigger "loans", resulting in an ever-increasing technical debt. Software engineering and procurement practices work in sync with market forces to maintain this trend. This talk demonstrates how natural this situation is. The question is: can something be done to reverse the trend?
Discover top-tier mobile app development services, offering innovative solutions for iOS and Android. Enhance your business with custom, user-friendly mobile applications.
Main news related to the CCS TSI 2023 (2023/1695)Jakub Marek
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An English đŹđ§ translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech đšđż version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
Generating privacy-protected synthetic data using Secludy and MilvusZilliz
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During this demo, the founders of Secludy will demonstrate how their system utilizes Milvus to store and manipulate embeddings for generating privacy-protected synthetic data. Their approach not only maintains the confidentiality of the original data but also enhances the utility and scalability of LLMs under privacy constraints. Attendees, including machine learning engineers, data scientists, and data managers, will witness first-hand how Secludy's integration with Milvus empowers organizations to harness the power of LLMs securely and efficiently.
In the realm of cybersecurity, offensive security practices act as a critical shield. By simulating real-world attacks in a controlled environment, these techniques expose vulnerabilities before malicious actors can exploit them. This proactive approach allows manufacturers to identify and fix weaknesses, significantly enhancing system security.
This presentation delves into the development of a system designed to mimic Galileo's Open Service signal using software-defined radio (SDR) technology. We'll begin with a foundational overview of both Global Navigation Satellite Systems (GNSS) and the intricacies of digital signal processing.
The presentation culminates in a live demonstration. We'll showcase the manipulation of Galileo's Open Service pilot signal, simulating an attack on various software and hardware systems. This practical demonstration serves to highlight the potential consequences of unaddressed vulnerabilities, emphasizing the importance of offensive security practices in safeguarding critical infrastructure.
Dandelion Hashtable: beyond billion requests per second on a commodity serverAntonios Katsarakis
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This slide deck presents DLHT, a concurrent in-memory hashtable. Despite efforts to optimize hashtables, that go as far as sacrificing core functionality, state-of-the-art designs still incur multiple memory accesses per request and block request processing in three cases. First, most hashtables block while waiting for data to be retrieved from memory. Second, open-addressing designs, which represent the current state-of-the-art, either cannot free index slots on deletes or must block all requests to do so. Third, index resizes block every request until all objects are copied to the new index. Defying folklore wisdom, DLHT forgoes open-addressing and adopts a fully-featured and memory-aware closed-addressing design based on bounded cache-line-chaining. This design offers lock-free index operations and deletes that free slots instantly, (2) completes most requests with a single memory access, (3) utilizes software prefetching to hide memory latencies, and (4) employs a novel non-blocking and parallel resizing. In a commodity server and a memory-resident workload, DLHT surpasses 1.6B requests per second and provides 3.5x (12x) the throughput of the state-of-the-art closed-addressing (open-addressing) resizable hashtable on Gets (Deletes).
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
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Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind fĂŒr viele in der HCL-Community seit letztem Jahr ein heiĂes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und LizenzgebĂŒhren zu kĂ€mpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklĂ€ren Ihnen, wie Sie hĂ€ufige Konfigurationsprobleme lösen können, die dazu fĂŒhren können, dass mehr Benutzer gezĂ€hlt werden als nötig, und wie Sie ĂŒberflĂŒssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige AnsĂ€tze, die zu unnötigen Ausgaben fĂŒhren können, z. B. wenn ein Personendokument anstelle eines Mail-Ins fĂŒr geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche FĂ€lle und deren Lösungen. Und natĂŒrlich erklĂ€ren wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt nĂ€herbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Ăberblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und ĂŒberflĂŒssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps fĂŒr hĂ€ufige Problembereiche, wie z. B. Team-PostfĂ€cher, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
What is an RPA CoE? Session 1 â CoE VisionDianaGray10
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In the first session, we will review the organization's vision and how this has an impact on the COE Structure.
Topics covered:
âą The role of a steering committee
âą How do the organizationâs priorities determine CoE Structure?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
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Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Essentials of Automations: Exploring Attributes & Automation ParametersSafe Software
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Building automations in FME Flow can save time, money, and help businesses scale by eliminating data silos and providing data to stakeholders in real-time. One essential component to orchestrating complex automations is the use of attributes & automation parameters (both formerly known as âkeysâ). In fact, itâs unlikely youâll ever build an Automation without using these components, but what exactly are they?
Attributes & automation parameters enable the automation author to pass data values from one automation component to the next. During this webinar, our FME Flow Specialists will cover leveraging the three types of these output attributes & parameters in FME Flow: Event, Custom, and Automation. As a bonus, theyâll also be making use of the Split-Merge Block functionality.
Youâll leave this webinar with a better understanding of how to maximize the potential of automations by making use of attributes & automation parameters, with the ultimate goal of setting your enterprise integration workflows up on autopilot.
"Choosing proper type of scaling", Olena SyrotaFwdays
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Imagine an IoT processing system that is already quite mature and production-ready and for which client coverage is growing and scaling and performance aspects are life and death questions. The system has Redis, MongoDB, and stream processing based on ksqldb. In this talk, firstly, we will analyze scaling approaches and then select the proper ones for our system.
zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...Alex Pruden
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Folding is a recent technique for building efficient recursive SNARKs. Several elegant folding protocols have been proposed, such as Nova, Supernova, Hypernova, Protostar, and others. However, all of them rely on an additively homomorphic commitment scheme based on discrete log, and are therefore not post-quantum secure. In this work we present LatticeFold, the first lattice-based folding protocol based on the Module SIS problem. This folding protocol naturally leads to an efficient recursive lattice-based SNARK and an efficient PCD scheme. LatticeFold supports folding low-degree relations, such as R1CS, as well as high-degree relations, such as CCS. The key challenge is to construct a secure folding protocol that works with the Ajtai commitment scheme. The difficulty, is ensuring that extracted witnesses are low norm through many rounds of folding. We present a novel technique using the sumcheck protocol to ensure that extracted witnesses are always low norm no matter how many rounds of folding are used. Our evaluation of the final proof system suggests that it is as performant as Hypernova, while providing post-quantum security.
Paper Link: https://eprint.iacr.org/2024/257