IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Sequences classification based on group technology for flexible manufacturing...eSAT Journals
Abstract Flexible cell formation is based on Group Technology. Group Technology rests on the exploitation of resemblances between products or processes, which makes the identification of products’ families and machines’ cells easier. We propose a new approach based on the language theory for product family grouping according to their manufacturing sequences. This approach uses linear sequences of the manufacturing products which are assimilated to the words of a language. We have chosen the Levenhstein distance for sequence classification. We are going to compare our method to Dice-Czekanowski and Jaccard’s methods and apply the vectorial correlation coefficient as a comparison tool between two hierarchical classifications. Keywords: manufacturing sequences, language theory, hierarchical classification, Group Technology.
IRJET- Developed Method for Optimal Solution of Transportation ProblemIRJET Journal
1. The document proposes a new method for finding an optimal solution to transportation problems in less iterations compared to existing methods like the Vogel's Approximation Method.
2. The key steps of the proposed method include finding the second minimum value from each row and column, selecting the row or column with the maximum second minimum value and allocating supplies or demands accordingly until a 2x2 matrix is reached.
3. The method is demonstrated on two examples and is shown to find the optimal solution in less iterations than other common methods for transportation problems.
IRJET- VLSI Architecture for Montgomery Modular MultiplicationIRJET Journal
The document discusses several VLSI architectures for Montgomery modular multiplication (MM) algorithms used in public key cryptography. It compares the performance of four MM multiplier designs: Radix-2 Montgomery, SCS-based Montgomery, FCS-based Montgomery, and a modified SCS-based Montgomery. The modified SCS design aims to reduce critical path delay while maintaining low hardware complexity. It was implemented on an FPGA and achieved a delay of 3.59ns, power of 20.36mW, and frequency of 278MHz, showing improvements over the other designs.
Analysis of stress in circular hollow section by fea and analytical techniqueeSAT Journals
Abstract This study focus on stress calculation in a cantilever beam by FEA &Analytical techniques. To know the value of maximum load bearing capacity of any particular beam this study has been generated. Structural analysis is foremost requirement in a design process. Also when we perform FEA analysis of any structure we cannot blindly trust on its result. If we don’t have any past result data of that structure, it became difficult for us to know the deviation of result. For that purpose we may require analytical calculation result in order to compare result value of FEA. Hence in this study a range of load values are applied on cantilever beam by both techniques. Later graph has been plotted for different load values & verification of results is carried out. Keywords: Structure Analysis, CATIA, FEA and Benchmarking
Analysis and simulation of rayleigh fading channel in digital communicationeSAT Journals
This document analyzes and simulates Rayleigh fading channels for digital communication systems using various modulation techniques. It begins by introducing Rayleigh fading channels and describing how they are modeled. It then analyzes the probability of bit error for digital modulation schemes like BPSK, QPSK, MPSK, and MQAM in Rayleigh fading channels. MATLAB simulations are used to plot constellations and signal power for M-QAM modulation. The document also analyzes the Joint Tactical Information Distribution System (JTIDS) and simulates its performance over Rayleigh fading channels. It concludes by discussing the results and potential for future work analyzing additional modulation techniques.
This document discusses concepts and methods for measuring productivity and efficiency. It begins by defining key terminology like productivity, technical efficiency, and allocative efficiency. It then describes set theoretic representations of production technologies and properties like constant returns to scale. Methods for measuring efficiency are described, including data envelopment analysis, index numbers, and stochastic frontier analysis. Distance functions and their relationship to production frontiers are explained. The document concludes by discussing measuring productivity and productivity change over time using a total factor productivity index.
Topology optimisation of hydraulic press structureeSAT Journals
Abstract Topology optimisation is carried out to find the zones of material removal on final size optimised structure. The results are represented and density plots are presented. The zones represented by blue can be removed for better material saving. The density plots are represented showing convergence of solution rapidly in the beginning and slowly in the later iterations. Finally wolf’s law is applied for material removal and addition for better strength. After iterations, the results are presented for vonmises and displacements. The results shows a vonmises stress of around 105 N/mm2 and a displacement value of 1.457mm. The final weight is observed to be around 15501kgs. The results shows efficiency of combination of three techniques in reducing the weigh of machine structures efficiently and useful for industrial applications as a combination. All the results are represented with necessary graphical pictures. The geometry is removed based on topology optimization and results are obtained based on wolff’s law. The structural results are presented. Keywords: Topoloyg1, optimisation2, vonmises stress3, Hydraulic press4 etc…
Numerical modeling to evaluate pile head deflection under the lateral loadeSAT Journals
Abstract The complex behavior of pile head deflection under the lateral load can be studied using various analytical methods and the softwares. Often the lateral pile load testing is carried out in the field to confirm the calculated lateral pile capacity. However, even with the use of sophisticated latest softwares, the accurate deflection of pile head cannot be estimated. Hence an attempt has been made in this paper to evaluate the pile head deflection using the field load-deflection data and the corresponding soil and pile properties. A preliminary mathematical model has been developed using a technique of dimensional analysis (DA) to evaluate pile head deflection under different pile diameters, different pile materials and varying soil conditions. The estimated pile head deflection using DA equation is compared with 14nos. of measured lateral pile load test results conducted at the site. It can be observed from this study that, the dimensional analysis can be used effectively to estimate the pile head deflection. More variables based on more field results can be introduced in the mathematical model to increase the accuracy in the estimation of pile head deflection. Keywords: Pile head deflection, Lateral pile load, Dimensional analysis
Sequences classification based on group technology for flexible manufacturing...eSAT Journals
Abstract Flexible cell formation is based on Group Technology. Group Technology rests on the exploitation of resemblances between products or processes, which makes the identification of products’ families and machines’ cells easier. We propose a new approach based on the language theory for product family grouping according to their manufacturing sequences. This approach uses linear sequences of the manufacturing products which are assimilated to the words of a language. We have chosen the Levenhstein distance for sequence classification. We are going to compare our method to Dice-Czekanowski and Jaccard’s methods and apply the vectorial correlation coefficient as a comparison tool between two hierarchical classifications. Keywords: manufacturing sequences, language theory, hierarchical classification, Group Technology.
IRJET- Developed Method for Optimal Solution of Transportation ProblemIRJET Journal
1. The document proposes a new method for finding an optimal solution to transportation problems in less iterations compared to existing methods like the Vogel's Approximation Method.
2. The key steps of the proposed method include finding the second minimum value from each row and column, selecting the row or column with the maximum second minimum value and allocating supplies or demands accordingly until a 2x2 matrix is reached.
3. The method is demonstrated on two examples and is shown to find the optimal solution in less iterations than other common methods for transportation problems.
IRJET- VLSI Architecture for Montgomery Modular MultiplicationIRJET Journal
The document discusses several VLSI architectures for Montgomery modular multiplication (MM) algorithms used in public key cryptography. It compares the performance of four MM multiplier designs: Radix-2 Montgomery, SCS-based Montgomery, FCS-based Montgomery, and a modified SCS-based Montgomery. The modified SCS design aims to reduce critical path delay while maintaining low hardware complexity. It was implemented on an FPGA and achieved a delay of 3.59ns, power of 20.36mW, and frequency of 278MHz, showing improvements over the other designs.
Analysis of stress in circular hollow section by fea and analytical techniqueeSAT Journals
Abstract This study focus on stress calculation in a cantilever beam by FEA &Analytical techniques. To know the value of maximum load bearing capacity of any particular beam this study has been generated. Structural analysis is foremost requirement in a design process. Also when we perform FEA analysis of any structure we cannot blindly trust on its result. If we don’t have any past result data of that structure, it became difficult for us to know the deviation of result. For that purpose we may require analytical calculation result in order to compare result value of FEA. Hence in this study a range of load values are applied on cantilever beam by both techniques. Later graph has been plotted for different load values & verification of results is carried out. Keywords: Structure Analysis, CATIA, FEA and Benchmarking
Analysis and simulation of rayleigh fading channel in digital communicationeSAT Journals
This document analyzes and simulates Rayleigh fading channels for digital communication systems using various modulation techniques. It begins by introducing Rayleigh fading channels and describing how they are modeled. It then analyzes the probability of bit error for digital modulation schemes like BPSK, QPSK, MPSK, and MQAM in Rayleigh fading channels. MATLAB simulations are used to plot constellations and signal power for M-QAM modulation. The document also analyzes the Joint Tactical Information Distribution System (JTIDS) and simulates its performance over Rayleigh fading channels. It concludes by discussing the results and potential for future work analyzing additional modulation techniques.
This document discusses concepts and methods for measuring productivity and efficiency. It begins by defining key terminology like productivity, technical efficiency, and allocative efficiency. It then describes set theoretic representations of production technologies and properties like constant returns to scale. Methods for measuring efficiency are described, including data envelopment analysis, index numbers, and stochastic frontier analysis. Distance functions and their relationship to production frontiers are explained. The document concludes by discussing measuring productivity and productivity change over time using a total factor productivity index.
Topology optimisation of hydraulic press structureeSAT Journals
Abstract Topology optimisation is carried out to find the zones of material removal on final size optimised structure. The results are represented and density plots are presented. The zones represented by blue can be removed for better material saving. The density plots are represented showing convergence of solution rapidly in the beginning and slowly in the later iterations. Finally wolf’s law is applied for material removal and addition for better strength. After iterations, the results are presented for vonmises and displacements. The results shows a vonmises stress of around 105 N/mm2 and a displacement value of 1.457mm. The final weight is observed to be around 15501kgs. The results shows efficiency of combination of three techniques in reducing the weigh of machine structures efficiently and useful for industrial applications as a combination. All the results are represented with necessary graphical pictures. The geometry is removed based on topology optimization and results are obtained based on wolff’s law. The structural results are presented. Keywords: Topoloyg1, optimisation2, vonmises stress3, Hydraulic press4 etc…
Numerical modeling to evaluate pile head deflection under the lateral loadeSAT Journals
Abstract The complex behavior of pile head deflection under the lateral load can be studied using various analytical methods and the softwares. Often the lateral pile load testing is carried out in the field to confirm the calculated lateral pile capacity. However, even with the use of sophisticated latest softwares, the accurate deflection of pile head cannot be estimated. Hence an attempt has been made in this paper to evaluate the pile head deflection using the field load-deflection data and the corresponding soil and pile properties. A preliminary mathematical model has been developed using a technique of dimensional analysis (DA) to evaluate pile head deflection under different pile diameters, different pile materials and varying soil conditions. The estimated pile head deflection using DA equation is compared with 14nos. of measured lateral pile load test results conducted at the site. It can be observed from this study that, the dimensional analysis can be used effectively to estimate the pile head deflection. More variables based on more field results can be introduced in the mathematical model to increase the accuracy in the estimation of pile head deflection. Keywords: Pile head deflection, Lateral pile load, Dimensional analysis
Analysis of GF (2m) Multiplication Algorithm: Classic Method v/s Karatsuba-Of...rahulmonikasharma
In recent years, finite field multiplication in GF(2m) has been widely used in various applications such as error correcting codes and cryptography. One of the motivations for fast and area efficient hardware solution for implementing the arithmetic operation of binary multiplication , in finite field GF (2m), comes from the fact, that they are the most time-consuming and frequently called operations in cryptography and other applications. So, the optimization of their hardware design is critical for overall performance of a system. Since a finite field multiplier is a crucial unit for overall performance of cryptographic systems, novel multiplier architectures, whose performances can be chosen freely, is necessary. In this paper, two Galois field multiplication algorithms (used in cryptography applications) are considered to analyze their performance with respect to parameters viz. area, power, delay, and the consequent Area×Time (AT) and Power×Delay characteristics. The objective of the analysis is to find out the most efficient GF(2m) multiplier algorithm among those considered.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
This academic article discusses numerical flow simulation of an elbow draft tube using STAR-CCM+ software. It summarizes the steps taken which include geometric modeling of the draft tube, mesh generation, specification of parameters like material properties and boundary conditions, and setting up the implicit unsteady simulation. Results of the simulation like pressure and velocity variations along the draft tube over different time steps are presented. Key findings are that pressure and velocity distributions are affected by time step size, with smaller time steps showing more uniform distributions. Performance metrics like head recovery and efficiency of the draft tube are computed and seen to decrease initially with time step before leveling off.
Study of Surface Roughness measurement in turning of EN 18 steelIRJET Journal
This document presents a study that uses response surface methodology to optimize surface roughness in the turning of EN 18 steel. Experimental work was conducted using a CNC lathe machine with spindle speed, feed rate, and depth of cut as input variables. A central composite design and Design Expert software were used to develop a test plan and analyze results. Regression equations were developed relating surface roughness to the input parameters. Confirmation experiments found less than 2.32% error between predicted and experimental surface roughness values, validating the developed model. Optimal parameters were identified as 1740.68 rpm spindle speed, 0.82 mm/min feed rate, and 1.27 mm depth of cut to achieve minimum surface roughness.
A new technique near minimum material zone, to reduce the weight of the com...eSAT Journals
Abstract Customers buy a product when the quality of the product is high. So manufacturers produce their components to high quality. The product such as aircraft, automobile, motorcycle, etc. not only need to be produced at high quality but also at reduced weight. This is because these products performance is depend on weight of the product. A component could consist of several components. So all relevant component weights are reduced, then the overall weight of the component could be reduced. This paper introduces as new technique called "near minimum material zone" where not only the weight of the component could be reduced but also helps to increase the quality. To demonstrate this technique, two sets of experiments with 20 samples were conducted using Deckel Maho CTX310 ECO VI CNC machine. The first experiment was conducted under normal machining condition. The second experiment was conducted under this new technique. Several tools such as process capability analysis (Cp, Cpk), cause and effect diagram, X Hi/Lo and R-charts were used to analyze the case study data. The paper outcome suggests that this new technique not only helped to control the weight of the components but also improved the desired quality by minimizing the dispersion of the component dimensions to obtain higher sigma level. Keywords: Near Minimum Material Zone, Process Capability, Cpk, Cause and Effect diagram, X Hi/Lo chart, R chart, Quality.
IRJET- Parallelization of Definite IntegrationIRJET Journal
1. The document discusses parallelizing numerical integration methods to improve computational efficiency. It describes Simpson's rule and Gaussian quadrature algorithms for definite integration and presents their parallelized versions.
2. The algorithms divide the integration interval into subintervals that can be computed independently, allowing parallel computation to evaluate the integral faster than serial computation for complex functions.
3. Testing showed Simpson's rule was faster than Gaussian quadrature and parallel computation was faster than serial for problems with many subintervals, demonstrating the benefit of parallelization for compute-intensive definite integration tasks.
OPTIMIZATION OF COST 231 MODEL FOR 3G WIRELESS COMMUNICATION SIGNAL IN SUBURB...Onyebuchi nosiri
This document describes the optimization of the Cost 231 model for 3G wireless communication signals in a suburban area of Port Harcourt, Nigeria. Field measurements were taken using drive testing equipment. The least squares algorithm was used to optimize parameters in the Cost 231 model based on the measured data. This reduced the mean absolute deviation from 1.196 to 1.179 and the mean squared deviation from 2.01 to 1.94, showing better prediction accuracy of the optimized model compared to the original Cost 231 model for the environment.
This document summarizes a student's presentation on using a meshfree method to analyze smart composite beams. It discusses:
1) The objectives of defining meshfree shape functions and comparing responses to exact solutions for 3-layer and 4-layer composite beams.
2) An introduction to meshfree methods, their advantages over FEM, and the basic workflow being similar between the two methods.
3) Details on constructing meshfree shape functions, including domain representation, interpolation approximations, and choosing weight functions.
4) An overview of smart materials like piezoelectric materials and their constitutive equations.
5) Schematics of the smart composite beam models and the governing equations being solved using the meshfree method.
SURVEY ON POLYGONAL APPROXIMATION TECHNIQUES FOR DIGITAL PLANAR CURVESZac Darcy
This document summarizes and compares three techniques for polygonal approximation of digital planar curves:
1) Masood's technique which iteratively deletes redundant points and uses a stabilization process to optimize point locations.
2) Carmona's technique which suppresses redundant points using a breakpoint suppression algorithm and threshold.
3) Tanvir's adaptive optimization algorithm which focuses on high curvature points and applies an optimization procedure.
The techniques are evaluated on standard shapes using measures like number of points, compression ratio, error, and weighted error. Masood's technique generally had lower error while Tanvir's often achieved the highest compression.
Compressor based approximate multiplier architectures for media processing ap...IJECEIAES
The document describes two new approximate multiplier designs based on a proposed 4:2 approximate compressor circuit. The proposed compressor reduces hardware complexity at the partial product reduction stage of multipliers. Error and hardware analysis shows the new designs reduce die area by up to 28% and power by up to 25.29% compared to existing designs, without a significant compromise in accuracy, making them suitable for error-tolerant media processing applications.
Unit 2-ME8691 & COMPUTER AIDED DESIGN AND MANUFACTURINGMohanumar S
This document discusses different geometric modeling techniques. It describes wireframe modeling where object edges are represented by lines. Surface modeling uses techniques like patches to represent curved surfaces. Solid modeling represents objects as solids to avoid misinterpretation. Constructive solid geometry and boundary representation are two common solid modeling techniques. CSG uses primitives and Boolean operations while boundary representation uses edges, vertices and faces to define boundaries.
Sustainable Manufacturing: Optimization of single pass Turning machining oper...sajal dixit
Main aim is to optimize a manufacturing process by using different Meta-heuristic algorithm. i had selected turning process here. Firstly i found the most influential parameters in turning process by introducing "Local-centrality Method". Optimization of these most influential parameters will lead to the optimization of whole process using "Genetic algorithm and Taguchi Method". Genetic algorithm has been used to optimize production rate & production cost and Taguchi method has been used to optimize cutting quality, which has been described in presentation.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The Queue M/M/1 with Additional Servers for a Longer QueueIJMER
This paper deals with the queuing system M/M/1 with additional servers for a longer queue.
Clearly the traffic intensity for this system will depend on the number of additional servers. The expected
number of customers in the system, the probability of the additional of one server and the probability of
the additional of two servers are obtained under the assumption that the number of additional servers
depends on the number of customers in the system. The condition under which the M/M/1 queuing system
with additional servers is profitable is discussed. A MATLAB program is used to illustrate this condition
numerically. Finally, the maximum likelihood estimators of the parameters for this queuing system are
obtained.
IRJET - Radius Approach for Inverse Kinematics of 4-R Manipulator in Spatial ...IRJET Journal
This paper presents a new approach for solving the inverse kinematics of a 4R manipulator in a spatial plane. The conventional D-H algorithm method involves complex matrix transformations. The proposed method reduces computational complexity by using several geometric relationships and constraints. It defines a linear relationship between the output radius and a diagonal distance to avoid singular regions. The radius and diagonal distance are used to calculate angular parameters and solve for the inverse kinematics without complex computations. This approach makes for a faster response time of electronic systems controlling the manipulator.
This document presents a comparison of linear regression and support vector machine (SVM) models for predicting construction project duration. A linear regression model was applied to data from 75 construction projects, using the Bromilow time-cost model. This achieved 73% accuracy based on R-squared and 10% error based on MAPE. An SVM model was then applied to the same data, achieving significantly improved prediction accuracy. The document provides background on linear regression, SVM, and the data and variables used to build and evaluate the two models.
Predicting construction project duration with support vector machineeSAT Journals
Abstract This paper presents a forecasting model for construction time, using support vector machine (SVM) – recently one of the most accurate predictive models. Every construction contract contains project deadline as an essential element of the contract. The practice shows that a considerably present problem is that of non-compliance of the contracted and real construction time. It's often the case that construction time is determined arbitrarily. The produced dynamic plans are only of formal character and not a reflection of the real possibilities of the contractor. First, a linear regression model has been applied to the data for 75 objects, using Bromilow’s “time cost” model. After that a support vector machine model to the same data was applied and significant improvement of the accuracy of the prediction was obtained. Keywords construction time, construction costs, artificial neural network, linear regression, support vector machine
This document discusses plant layout and provides information on various layout types and techniques. It begins by defining a layout and what constitutes a good layout. It then discusses different layout types like process, product, and fixed position layouts. It also covers layout techniques like CRAFT, group technology, and flexible manufacturing systems. The document concludes with objective questions related to plant layout concepts.
Performance prediction of a turboshaft engine by using of one dimensional ana...ijmech
Performance estimation of the axial flow gas turbines under variety of operating conditions like different speeds and pressure ratios has been hampered by lack of reliable experimental data and experiments cost.Simulation of gas turbine is a simple way to reduce testing costs and complexity.One-dimensional (1D).Simulation is a simple, fast and accurate method for performance prediction of turbine with different geometries. In this approach, inlet flow conditions and turbine geometry are known and by considering loss model, the turbine performance characteristics are predicted. In following work, that is based on one dimensional modelling method, after the presentation of solution algorithm by trial and error method and introduction of different loss models for modelling, this method were examined for a turbo shaft engine and
compared with experimental results. Comparison of the results with experimental data shows so good adaptation. Also according to these results, Kacker and Okapuu’s developed model gave the closest results to the reference data.
Types of layout algorithms include construction algorithms like ALDEP and CORELAP as well as improvement algorithms like pairwise exchange methods. ALDEP is a construction algorithm that builds a layout by successively placing departments based on their relationship information and minimum department preferences. It requires inputs like department areas, a REL chart, and sweep width. CORELAP is also a construction algorithm that determines department placement order based on total closeness ratings and places departments to maximize placing ratings, resulting in an optimal layout.
Analysis of multiport dc dc converter in renewable energy sourceseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
This document summarizes a study on the performance of nano graphite inclusions in cutting fluids used with minimum quantity lubrication (MQL) technique in turning AISI 1040 steel. Nano graphite powder of 80nm particle size was mixed in varying proportions from 0.0% to 0.5% by weight in water soluble oil. Experiments were conducted using HSS and cemented carbide tools under dry, flood coolant and MQL conditions at different flow rates. Results showed that MQL with nano graphite fluids significantly reduced surface roughness, tool wear, cutting forces and temperatures compared to dry and flood coolant conditions. The highest reductions were observed with 0.3-0.5% nano graphite concentration
Analysis of GF (2m) Multiplication Algorithm: Classic Method v/s Karatsuba-Of...rahulmonikasharma
In recent years, finite field multiplication in GF(2m) has been widely used in various applications such as error correcting codes and cryptography. One of the motivations for fast and area efficient hardware solution for implementing the arithmetic operation of binary multiplication , in finite field GF (2m), comes from the fact, that they are the most time-consuming and frequently called operations in cryptography and other applications. So, the optimization of their hardware design is critical for overall performance of a system. Since a finite field multiplier is a crucial unit for overall performance of cryptographic systems, novel multiplier architectures, whose performances can be chosen freely, is necessary. In this paper, two Galois field multiplication algorithms (used in cryptography applications) are considered to analyze their performance with respect to parameters viz. area, power, delay, and the consequent Area×Time (AT) and Power×Delay characteristics. The objective of the analysis is to find out the most efficient GF(2m) multiplier algorithm among those considered.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
This academic article discusses numerical flow simulation of an elbow draft tube using STAR-CCM+ software. It summarizes the steps taken which include geometric modeling of the draft tube, mesh generation, specification of parameters like material properties and boundary conditions, and setting up the implicit unsteady simulation. Results of the simulation like pressure and velocity variations along the draft tube over different time steps are presented. Key findings are that pressure and velocity distributions are affected by time step size, with smaller time steps showing more uniform distributions. Performance metrics like head recovery and efficiency of the draft tube are computed and seen to decrease initially with time step before leveling off.
Study of Surface Roughness measurement in turning of EN 18 steelIRJET Journal
This document presents a study that uses response surface methodology to optimize surface roughness in the turning of EN 18 steel. Experimental work was conducted using a CNC lathe machine with spindle speed, feed rate, and depth of cut as input variables. A central composite design and Design Expert software were used to develop a test plan and analyze results. Regression equations were developed relating surface roughness to the input parameters. Confirmation experiments found less than 2.32% error between predicted and experimental surface roughness values, validating the developed model. Optimal parameters were identified as 1740.68 rpm spindle speed, 0.82 mm/min feed rate, and 1.27 mm depth of cut to achieve minimum surface roughness.
A new technique near minimum material zone, to reduce the weight of the com...eSAT Journals
Abstract Customers buy a product when the quality of the product is high. So manufacturers produce their components to high quality. The product such as aircraft, automobile, motorcycle, etc. not only need to be produced at high quality but also at reduced weight. This is because these products performance is depend on weight of the product. A component could consist of several components. So all relevant component weights are reduced, then the overall weight of the component could be reduced. This paper introduces as new technique called "near minimum material zone" where not only the weight of the component could be reduced but also helps to increase the quality. To demonstrate this technique, two sets of experiments with 20 samples were conducted using Deckel Maho CTX310 ECO VI CNC machine. The first experiment was conducted under normal machining condition. The second experiment was conducted under this new technique. Several tools such as process capability analysis (Cp, Cpk), cause and effect diagram, X Hi/Lo and R-charts were used to analyze the case study data. The paper outcome suggests that this new technique not only helped to control the weight of the components but also improved the desired quality by minimizing the dispersion of the component dimensions to obtain higher sigma level. Keywords: Near Minimum Material Zone, Process Capability, Cpk, Cause and Effect diagram, X Hi/Lo chart, R chart, Quality.
IRJET- Parallelization of Definite IntegrationIRJET Journal
1. The document discusses parallelizing numerical integration methods to improve computational efficiency. It describes Simpson's rule and Gaussian quadrature algorithms for definite integration and presents their parallelized versions.
2. The algorithms divide the integration interval into subintervals that can be computed independently, allowing parallel computation to evaluate the integral faster than serial computation for complex functions.
3. Testing showed Simpson's rule was faster than Gaussian quadrature and parallel computation was faster than serial for problems with many subintervals, demonstrating the benefit of parallelization for compute-intensive definite integration tasks.
OPTIMIZATION OF COST 231 MODEL FOR 3G WIRELESS COMMUNICATION SIGNAL IN SUBURB...Onyebuchi nosiri
This document describes the optimization of the Cost 231 model for 3G wireless communication signals in a suburban area of Port Harcourt, Nigeria. Field measurements were taken using drive testing equipment. The least squares algorithm was used to optimize parameters in the Cost 231 model based on the measured data. This reduced the mean absolute deviation from 1.196 to 1.179 and the mean squared deviation from 2.01 to 1.94, showing better prediction accuracy of the optimized model compared to the original Cost 231 model for the environment.
This document summarizes a student's presentation on using a meshfree method to analyze smart composite beams. It discusses:
1) The objectives of defining meshfree shape functions and comparing responses to exact solutions for 3-layer and 4-layer composite beams.
2) An introduction to meshfree methods, their advantages over FEM, and the basic workflow being similar between the two methods.
3) Details on constructing meshfree shape functions, including domain representation, interpolation approximations, and choosing weight functions.
4) An overview of smart materials like piezoelectric materials and their constitutive equations.
5) Schematics of the smart composite beam models and the governing equations being solved using the meshfree method.
SURVEY ON POLYGONAL APPROXIMATION TECHNIQUES FOR DIGITAL PLANAR CURVESZac Darcy
This document summarizes and compares three techniques for polygonal approximation of digital planar curves:
1) Masood's technique which iteratively deletes redundant points and uses a stabilization process to optimize point locations.
2) Carmona's technique which suppresses redundant points using a breakpoint suppression algorithm and threshold.
3) Tanvir's adaptive optimization algorithm which focuses on high curvature points and applies an optimization procedure.
The techniques are evaluated on standard shapes using measures like number of points, compression ratio, error, and weighted error. Masood's technique generally had lower error while Tanvir's often achieved the highest compression.
Compressor based approximate multiplier architectures for media processing ap...IJECEIAES
The document describes two new approximate multiplier designs based on a proposed 4:2 approximate compressor circuit. The proposed compressor reduces hardware complexity at the partial product reduction stage of multipliers. Error and hardware analysis shows the new designs reduce die area by up to 28% and power by up to 25.29% compared to existing designs, without a significant compromise in accuracy, making them suitable for error-tolerant media processing applications.
Unit 2-ME8691 & COMPUTER AIDED DESIGN AND MANUFACTURINGMohanumar S
This document discusses different geometric modeling techniques. It describes wireframe modeling where object edges are represented by lines. Surface modeling uses techniques like patches to represent curved surfaces. Solid modeling represents objects as solids to avoid misinterpretation. Constructive solid geometry and boundary representation are two common solid modeling techniques. CSG uses primitives and Boolean operations while boundary representation uses edges, vertices and faces to define boundaries.
Sustainable Manufacturing: Optimization of single pass Turning machining oper...sajal dixit
Main aim is to optimize a manufacturing process by using different Meta-heuristic algorithm. i had selected turning process here. Firstly i found the most influential parameters in turning process by introducing "Local-centrality Method". Optimization of these most influential parameters will lead to the optimization of whole process using "Genetic algorithm and Taguchi Method". Genetic algorithm has been used to optimize production rate & production cost and Taguchi method has been used to optimize cutting quality, which has been described in presentation.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The Queue M/M/1 with Additional Servers for a Longer QueueIJMER
This paper deals with the queuing system M/M/1 with additional servers for a longer queue.
Clearly the traffic intensity for this system will depend on the number of additional servers. The expected
number of customers in the system, the probability of the additional of one server and the probability of
the additional of two servers are obtained under the assumption that the number of additional servers
depends on the number of customers in the system. The condition under which the M/M/1 queuing system
with additional servers is profitable is discussed. A MATLAB program is used to illustrate this condition
numerically. Finally, the maximum likelihood estimators of the parameters for this queuing system are
obtained.
IRJET - Radius Approach for Inverse Kinematics of 4-R Manipulator in Spatial ...IRJET Journal
This paper presents a new approach for solving the inverse kinematics of a 4R manipulator in a spatial plane. The conventional D-H algorithm method involves complex matrix transformations. The proposed method reduces computational complexity by using several geometric relationships and constraints. It defines a linear relationship between the output radius and a diagonal distance to avoid singular regions. The radius and diagonal distance are used to calculate angular parameters and solve for the inverse kinematics without complex computations. This approach makes for a faster response time of electronic systems controlling the manipulator.
This document presents a comparison of linear regression and support vector machine (SVM) models for predicting construction project duration. A linear regression model was applied to data from 75 construction projects, using the Bromilow time-cost model. This achieved 73% accuracy based on R-squared and 10% error based on MAPE. An SVM model was then applied to the same data, achieving significantly improved prediction accuracy. The document provides background on linear regression, SVM, and the data and variables used to build and evaluate the two models.
Predicting construction project duration with support vector machineeSAT Journals
Abstract This paper presents a forecasting model for construction time, using support vector machine (SVM) – recently one of the most accurate predictive models. Every construction contract contains project deadline as an essential element of the contract. The practice shows that a considerably present problem is that of non-compliance of the contracted and real construction time. It's often the case that construction time is determined arbitrarily. The produced dynamic plans are only of formal character and not a reflection of the real possibilities of the contractor. First, a linear regression model has been applied to the data for 75 objects, using Bromilow’s “time cost” model. After that a support vector machine model to the same data was applied and significant improvement of the accuracy of the prediction was obtained. Keywords construction time, construction costs, artificial neural network, linear regression, support vector machine
This document discusses plant layout and provides information on various layout types and techniques. It begins by defining a layout and what constitutes a good layout. It then discusses different layout types like process, product, and fixed position layouts. It also covers layout techniques like CRAFT, group technology, and flexible manufacturing systems. The document concludes with objective questions related to plant layout concepts.
Performance prediction of a turboshaft engine by using of one dimensional ana...ijmech
Performance estimation of the axial flow gas turbines under variety of operating conditions like different speeds and pressure ratios has been hampered by lack of reliable experimental data and experiments cost.Simulation of gas turbine is a simple way to reduce testing costs and complexity.One-dimensional (1D).Simulation is a simple, fast and accurate method for performance prediction of turbine with different geometries. In this approach, inlet flow conditions and turbine geometry are known and by considering loss model, the turbine performance characteristics are predicted. In following work, that is based on one dimensional modelling method, after the presentation of solution algorithm by trial and error method and introduction of different loss models for modelling, this method were examined for a turbo shaft engine and
compared with experimental results. Comparison of the results with experimental data shows so good adaptation. Also according to these results, Kacker and Okapuu’s developed model gave the closest results to the reference data.
Types of layout algorithms include construction algorithms like ALDEP and CORELAP as well as improvement algorithms like pairwise exchange methods. ALDEP is a construction algorithm that builds a layout by successively placing departments based on their relationship information and minimum department preferences. It requires inputs like department areas, a REL chart, and sweep width. CORELAP is also a construction algorithm that determines department placement order based on total closeness ratings and places departments to maximize placing ratings, resulting in an optimal layout.
Analysis of multiport dc dc converter in renewable energy sourceseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
This document summarizes a study on the performance of nano graphite inclusions in cutting fluids used with minimum quantity lubrication (MQL) technique in turning AISI 1040 steel. Nano graphite powder of 80nm particle size was mixed in varying proportions from 0.0% to 0.5% by weight in water soluble oil. Experiments were conducted using HSS and cemented carbide tools under dry, flood coolant and MQL conditions at different flow rates. Results showed that MQL with nano graphite fluids significantly reduced surface roughness, tool wear, cutting forces and temperatures compared to dry and flood coolant conditions. The highest reductions were observed with 0.3-0.5% nano graphite concentration
“Influence of particle index of coarse aggregate and its influences on proper...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document discusses and compares various lookup algorithms that can be used for IPv6 packet forwarding at speeds over 100 Gbps. It begins by introducing the need for IPv6 due to IPv4 address exhaustion and issues with forwarding IPv6 packets due to its larger 128-bit address size. It then summarizes four existing lookup algorithms - Distributed Memory Organizations, TrieC, Recursive Balanced Multi-way range trees, and Range tree based IPv6 lookup. The document aims to determine the best algorithm by performing a comparative analysis based on parameters like latency, throughput, memory requirements and scalability.
Vibration analysis of line continuum with new matrices of elastic and inertia...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Production, characterisation and value addition of dahi made from raw, pasteu...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A comparative evaluation on the properties of hma with variations in aggregat...eSAT Publishing House
This document discusses a study that evaluated the properties of Hot Mix Asphalt (HMA) mixtures designed using five different aggregate gradations within the specified limits for Bituminous Concrete Grade-I mixes according to Indian specifications. The study determined the optimum binder content and evaluated the Marshall properties and volumetric properties of mixes produced with each gradation. Results showed that mixes made with the mid-point gradation had higher stability values than other mixes. Optimum binder content increased from coarser to finer gradations. A gradation ratio parameter was also evaluated to indicate aggregate grading types and correlate them with mix design parameters for different gradations.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Cfd analysis of calandria based nuclear reactor part ii. parametric analysis ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The document discusses restrained domination in graphs. It defines a restrained dominating set of a lict graph as a set where every vertex not in the set is adjacent to a vertex in the set as well as another vertex not in the set. It studies the exact values of the restrained domination number (the minimum cardinality of a restrained dominating set) for some standard graphs. Bounds on the restrained domination number are obtained in terms of the number of vertices and edges of the graph. Relationships between the restrained domination number and other graph parameters like diameter and domination number are also investigated.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document discusses a novel model for rural housing development in India. It notes that while India has a growing economy, 70% of its population still lives in rural villages and there are 78 million homeless people. It then proposes a new housing model that uses low-cost materials like plastic glass bricks and a smart roof structure to provide lighting. The roof would use the Tyndall effect to let in ambient light during the day and solar panels to power LED lights at night. This would help provide affordable, stable housing while also addressing the lack of electricity access in many rural areas. The goal is to help alleviate homelessness and poverty in India by developing cost-effective, sustainable housing.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Analysis of stress concentration at opening in pressure vessel using anovaeSAT Publishing House
This document presents an analysis of stress concentration at openings in pressure vessels using analysis of variance (ANOVA). The study uses a pressure vessel with four nozzles of varying diameters instrumented with strain gauges. Experiments are conducted by applying internal pressures from 0.2 to 0.7 MPa in a randomized sequence to prevent bias. ANOVA is used to analyze the experimental results and determine the interaction between nozzle diameter and internal pressure. The ANOVA results show that pressure and nozzle diameter significantly influence stress levels, rejecting the null hypothesis that they do not interact. Stress is found to increase with both larger nozzle diameters and higher internal pressures.
Regression model for analyzing the dgs structures propagation characterisitcseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document discusses optimizing the gate-level area of digit-serial finite impulse response (FIR) filter designs using multiple constant multiplication (MCM) blocks. It introduces the problem of designing a digit-serial MCM operation with minimal area and presents algorithms to formalize the area optimization problem. Results show the proposed algorithms and digit-serial MCM architectures efficiently design digit-serial MCM operations and FIR filters with reduced area compared to existing approaches.
PRODUCTIVITY IMPROVEMENT IN STITCHING SECTION OF A GARMENT MANUFACTURING COMPANYAM Publications
In this study one heuristic assembly line balancing technique known as the “Ranked Positional weight Technique”, developed by Helgeson and Birnie was applied to solve the problem of assembly line balancing in a garment manufacturing company for one model. Information about solution methods related to assembly line balancing problems is given. Operator reduction is achieved by line balancing. Layout was modified using the template method. The aim of this article is the usage of these techniques to improve the productivity in a clothing company.
Balancing the line by using heuristic method based on cpm in salbp –a case studyeSAT Journals
Abstract
In mass production systems, line balancing plays a great role, but this is not easy even if it is a simple straight line. So, in order to
solve these problems Heuristic methods are very much desirable. It is also found that Heuristic methods play a great role in the
formation of metaheuristic methods.Therefore it is very much important to use more efficient heuristic methods. In this research
paper we presents a heuristic method that is based on critical path method for simple assembly line balancing. This research is
mainly concerned with objectives of minimizing the number of workstations, improvement of smoothness index, mean absolute
deviation (MAD) and increasing line efficiency.
Keywords-Heuristic methods,Assembly line balancing problem, Critical path method, Simple assembly line balancing.
Capp system process sequence optimization based on genetic algorithmseSAT Journals
Abstract
The arrangement of the process sequence is one of the key technologies in CAPP system antomatically generating process
diagram, is the key whether the process design is reasonable or not, is also one of the difficulties in process design. To solve this
problem, this paper proposes using genetic algorithms to optimize process sequence based on process constraints and uses a
housing part to vertify.The result shows that using genetic algorithms can effectively optimize the process routes and get the
optimal or near-optimal routings which meet the production requirements.
Keywords: Process sequence, Genetic algorithms, CAPP, Process diagram
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Fault diagnosis using genetic algorithms and principal curveseSAT Journals
Abstract Several applications of nonlinear principal component analysis (NPCA) have appeared recently in process monitoring and fault diagnosis. In this paper a new approach is proposed for fault detection based on principal curves and genetic algorithms. The principal curve is a generation of linear principal component (PCA) introduced by Hastie as a parametric curve passes satisfactorily through the middle of data. The existing principal curves algorithms employ the first component of the data as an initial estimation of principal curve. However the dependence on initial line leads to a lack of flexibility and the final curve is only satisfactory for specific problems. In this paper we extend this work in two ways. First, we propose a new method based on genetic algorithms to find the principal curve. Here, lines are fitted and connected to form polygonal lines (PL). Second, potential application of principal curves is discussed. An example is used to illustrate fault diagnosis of nonlinear process using the proposed approach. Index Terms: Principal curve, Genetic Algorithm, Nonlinear principal component analysis, Fault detection.
IRJET- Comparison for Max-Flow Min-Cut Algorithms for Optimal Assignment ProblemIRJET Journal
This document compares algorithms for optimally assigning individuals to centers to minimize total travel costs and distance, such as for a large-scale event. It formulates the problem as a graph assignment problem that can be solved using max-flow min-cut algorithms. It evaluates the Hungarian algorithm, Ford-Fulkerson algorithm, Edmonds-Karp algorithm, and Auction algorithm, implementing them to recommend the best for providing an optimized allocation in the shortest time.
IRJET- Efficient Design of Radix Booth MultiplierIRJET Journal
The document proposes a method to optimize binary radix-16 Booth multipliers by reducing the maximum height of the partial product columns from (n + 1)/4 to n/4 for n-bit operands. This is achieved by performing a short carry-propagate addition in parallel to the regular partial product generation, which reduces the maximum height by one row. The method allows further optimizations in the partial product array reduction stage in terms of area, delay, and power. It can also allow additional partial products to be included without increasing delay. The method is generally applicable but provides the most benefit for 64-bit radix-16 Booth multipliers.
This document summarizes a research paper that implemented a pipelined CORDIC architecture in Simulink to generate sine and cosine values. The CORDIC algorithm uses only shift and add operations to perform trigonometric and other elementary functions. It was applied here in rotation mode to simultaneously compute sine and cosine of an input angle. A 12-stage pipelined CORDIC architecture was modeled in Simulink. The shifts and constants were hardwired to reduce resources and latency. Testing with an input of 0.6 radians showed accurate outputs for sine and cosine. The implementation demonstrated the utility of Simulink for modeling hardware systems and algorithms like CORDIC.
An Algorithm for Optimized Cost in a Distributed Computing SystemIRJET Journal
This document summarizes an algorithm for optimized cost allocation in a distributed computing system. The algorithm considers a set of tasks that need to be assigned to processors across multiple phases. It calculates execution costs, residing costs, communication costs, and reallocation costs to determine the optimal allocation that minimizes overall system costs. The algorithm is demonstrated on a sample problem involving 4 tasks to be allocated across 2 processors over 5 phases. Cost matrices are provided and the algorithm partitions the problem into subproblems to determine the lowest cost allocation for each phase and overall.
Design and Modelling of Automated Dimensional Check Conveyor Belt System for ...IRJET Journal
This document describes the design and modeling of an automated dimensional check conveyor belt system to categorize objects. The proposed system uses ultrasonic sensors and a microcontroller to simultaneously check three dimensions of an object passing on the conveyor belt. The system then uses a diverter to separate defective objects. The design calculations, circuit design, implementation of components like the conveyor belt, sensors and microcontroller are discussed. The experimental results show the system can successfully measure object dimensions and separate non-conforming objects in about 3 seconds.
IRJET- A Novel Gabor Feed Forward Network for Pose Invariant Face Recogni...IRJET Journal
The document proposes an Analytic Gabor Feed Forward Network (AGFN) for pose invariant face recognition. AGFN uses a single hidden layer to efficiently extract Gabor features from raw face images without computationally expensive convolutions. Features from multiple orientations and scales are fused at the output layer. The network is trained using total error rate minimization to find a globally optimal solution without iterations. Experiments on several public face datasets showed the AGFN approach achieved accurate face recognition while being computationally efficient.
IRJET- Advanced Control Strategies for Mold Level ProcessIRJET Journal
This document discusses advanced control strategies for mold level process in continuous casting of steel. It proposes using a fuzzy controller to help control mold level during abnormal conditions like nozzle clogging/unclogging, which can be difficult for a proportional-integral-derivative controller to handle alone. The fuzzy controller design is based on operator expertise. Image processing techniques are also used to monitor mold level in real-time, including image segmentation using fuzzy clustering and classification using support vector machines. Simulation and online implementation results indicate the effectiveness of these advanced control methods in maintaining stable mold level during transient disturbances in the continuous casting process.
IRJET- Implementation of FIR Filter using Self Tested 2n-2k-1 Modulo AdderIRJET Journal
This document presents a novel algorithm and VLSI implementation for a modulo 2n-2k-1 adder. The proposed modulo adder structure has four modules: pre-processing, carry generation, carry modification, and sum calculation. It aims to reduce area and delay compared to traditional modulo adders. The proposed adder is used to generate random numbers with a long period suitable for cryptography. It is also used to implement a finite impulse response (FIR) filter to demonstrate better performance than a normal FIR filter. Simulation results show the proposed FIR filter using the modulo adder has a delay of 11.21ns, less than the 26.69ns delay of a conventional FIR filter.
IRJET - Design of a Low Power Serial- Parallel Multiplier with Low Transition...IRJET Journal
This document describes the design of a low power serial-parallel multiplier that uses a modified radix-4 Booth algorithm. It aims to improve performance over a standard serial-parallel Booth multiplier in terms of area, delay, and power. The proposed multiplier generates partial products conditionally, adding only non-zero Booth encodings and skipping zero operations to reduce transitions and increase throughput. It is implemented using FPGA technology to evaluate its utility for applications like digital signal processing and machine learning that require high performance multiplication.
A simplified method of designing a phase lead compensator to improve the m-s-...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IRJET- Optimization of Fink and Howe TrussesIRJET Journal
This document describes research on optimizing the weight of different truss configurations, including double fink, triple fink, modified fink, double Howe, and triple Howe trusses. The optimization problem aims to minimize weight by treating cross-sectional areas as design variables, while satisfying stress, buckling, and deflection constraints. An improved sequential linear programming technique is used to solve the optimization problem. The process involves developing a C program for load calculation, using MATLAB for truss analysis, and applying an optimizer based on improved SLP to determine optimized cross-sectional areas. A parametric study is then carried out by varying span, height, and spacing to identify the most economical truss configuration under the given conditions.
A Hybrid Data Clustering Approach using K-Means and Simplex Method-based Bact...IRJET Journal
The document proposes a hybrid clustering algorithm called SMBCO+KM that combines k-means clustering, bacterial colony optimization (BCO), and the simplex method. K-means is used for its fast clustering ability but depends on initial conditions. BCO is used to search the solution space but has a slow convergence rate. The simplex method enhances the performance of BCO. The hybrid approach uses BCO initially to search globally, then switches to k-means locally to generate more precise clusters. Simulation results on six datasets show the proposed approach outperforms other algorithms in clustering quality and runtime.
Comparitive analysis of doa and beamforming algorithms for smart antenna systemseSAT Journals
Abstract This paper revolves around the implementation of Direction of arrival and Adaptive beam-forming algorithms for Smart Antenna Systems. This paper also investigates the implementation of algorithms on various planner array geometries viz. circular and rectangular. Music algorithm is primarily finds the possible location of desired user and adaptive beam-forming algorithms such as LMS, RLS and CMA algorithms adapts the weights of the array. DOA estimation gives the maximum peak of spectrum with respect to angle of arrival where the desired user is supposed to exist. After DOA estimation weights of array antenna are changed with the changing received signal. This methodology is called as Spectral estimation, which allows the antenna pattern to steer in desired direction estimated by DOA and simultaneously null out the interfering signals. Rate of convergence is the major criterion for comparison for adaptive beam-forming algorithms. Keywords: DOA, MUSIC, LMS, RLS, CMA, SAS.
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.
Similar to Sequences classification based on group technology (20)
Hudhud cyclone caused extensive damage in Visakhapatnam, India in October 2014, especially to tree cover. This will likely impact the local environment in several ways: increased air pollution as trees absorb less; higher temperatures without tree canopy; increased erosion and landslides. It also created large amounts of waste from destroyed trees. Proper management of solid waste is needed to prevent disease spread. Suggested measures include restoring damaged plants, building fountains to reduce heat, mandating light-colored buildings, improving waste management, and educating public on health risks. Overall, changes are needed to water, land, and waste practices to rebuild the environment after the cyclone removed green cover.
Impact of flood disaster in a drought prone area – case study of alampur vill...eSAT Publishing House
1) In September-October 2009, unprecedented heavy rainfall and dam releases caused widespread flooding in Alampur village in Mahabub Nagar district, a historically drought-prone area.
2) The flood damaged or destroyed homes, buildings, infrastructure, crops, and documents. It displaced many residents and cut off the village.
3) The socioeconomic conditions and mud-based construction of homes in the village exacerbated the flood's impacts, making damage more severe and recovery more difficult.
The document summarizes the Hudhud cyclone that struck Visakhapatnam, India in October 2014. It describes the cyclone's formation, rapid intensification to winds of 175 km/h, and landfall near Visakhapatnam. The cyclone caused extensive damage estimated at over $1 billion and at least 109 deaths in India and Nepal. Infrastructure like buildings, bridges, and power lines were destroyed. Crops and fishing boats were also damaged. The document then discusses coping strategies and improvements needed to disaster management plans to better prepare for future cyclones.
Groundwater investigation using geophysical methods a case study of pydibhim...eSAT Publishing House
This document summarizes the results of a geophysical investigation using vertical electrical sounding (VES) methods at 13 locations around an industrial area in India. The VES data was interpreted to generate geo-electric sections and pseudo-sections showing subsurface resistivity variations. Three main layers were typically identified - a high resistivity topsoil, a weathered middle layer, and a basement rock. Pseudo-sections revealed relatively more weathered areas in the northwest and southwest. Resistivity sections helped identify zones of possible high groundwater potential based on low resistivity anomalies sandwiched between more resistive layers. The study concluded the electrical resistivity method was useful for understanding subsurface geology and identifying areas prospective for groundwater exploration.
Flood related disasters concerned to urban flooding in bangalore, indiaeSAT Publishing House
1. The document discusses urban flooding in Bangalore, India. It describes how factors like heavy rainfall, population growth, and improper land use have contributed to increased flooding in the city.
2. Flooding events in 2013 are analyzed in detail. A November rainfall caused runoff six times higher than the drainage capacity, inundating low-lying residential areas.
3. Impacts of urban flooding include disrupted daily life, damaged infrastructure, and decreased economic activity in affected areas. The document calls for improved flood management strategies to better mitigate urban flooding risks in Bangalore.
Enhancing post disaster recovery by optimal infrastructure capacity buildingeSAT Publishing House
This document discusses enhancing post-disaster recovery through optimal infrastructure capacity building. It presents a model to minimize the cost of meeting demand using auxiliary capacities when disaster damages infrastructure. The model uses genetic algorithms to select optimal capacity combinations. The document reviews how infrastructure provides vital services supporting recovery activities and discusses classifying infrastructure into six types. When disaster reduces infrastructure services, a gap forms between community demands and available support, hindering recovery. The proposed research aims to identify this gap and optimize capacity selection to fill it cost-effectively.
Effect of lintel and lintel band on the global performance of reinforced conc...eSAT Publishing House
This document analyzes the effect of lintels and lintel bands on the seismic performance of reinforced concrete masonry infilled frames through non-linear static pushover analysis. Four frame models are considered: a frame with a full masonry infill wall; a frame with a central opening but no lintel/band; a frame with a lintel above the opening; and a frame with a lintel band above the opening. The results show that the full infill wall model has 27% higher stiffness and 32% higher strength than the model with just an opening. Models with lintels or lintel bands have slightly higher strength and stiffness than the model with just an opening. The document concludes lintels and lintel
Wind damage to trees in the gitam university campus at visakhapatnam by cyclo...eSAT Publishing House
1) A cyclone with wind speeds of 175-200 kph caused massive damage to the green cover of Gitam University campus in Visakhapatnam, India. Thousands of trees were uprooted or damaged.
2) A study assessed different types of damage to trees from the cyclone, including defoliation, salt spray damage, damage to stems/branches, and uprooting. Certain tree species were more vulnerable than others.
3) The results of the study can help in selecting more wind-resistant tree species for future planting and reducing damage from future storms.
Wind damage to buildings, infrastrucuture and landscape elements along the be...eSAT Publishing House
1) A visual study was conducted to assess wind damage from Cyclone Hudhud along the 27km Visakha-Bheemli Beach road in Visakhapatnam, India.
2) Residential and commercial buildings suffered extensive roof damage, while glass facades on hotels and restaurants were shattered. Infrastructure like electricity poles and bus shelters were destroyed.
3) Landscape elements faced damage, including collapsed trees that damaged pavements, and debris in parks. The cyclone wiped out over half the city's green cover and caused beach erosion around protected areas.
1) The document reviews factors that influence the shear strength of reinforced concrete deep beams, including compressive strength of concrete, percentage of tension reinforcement, vertical and horizontal web reinforcement, aggregate interlock, shear span-to-depth ratio, loading distribution, side cover, and beam depth.
2) It finds that compressive strength of concrete, tension reinforcement percentage, and web reinforcement all increase shear strength, while shear strength decreases as shear span-to-depth ratio increases.
3) The distribution and amount of vertical and horizontal web reinforcement also affects shear strength, but closely spaced stirrups do not necessarily enhance capacity or performance.
Role of voluntary teams of professional engineers in dissater management – ex...eSAT Publishing House
1) A team of 17 professional engineers from various disciplines called the "Griha Seva" team volunteered after the 2001 Gujarat earthquake to provide technical assistance.
2) The team conducted site visits, assessments, testing and recommended retrofitting strategies for damaged structures in Bhuj and Ahmedabad. They were able to fully assess and retrofit 20 buildings in Ahmedabad.
3) Factors observed that exacerbated the earthquake's impacts included unplanned construction, non-engineered buildings, improper prior retrofitting, and defective materials and workmanship. The professional engineers' technical expertise was crucial for effective post-disaster management.
This document discusses risk analysis and environmental hazard management. It begins by defining risk, hazard, and toxicity. It then outlines the steps involved in hazard identification, including HAZID, HAZOP, and HAZAN. The document presents a case study of a hypothetical gas collecting station, identifying potential accidents and hazards. It discusses quantitative and qualitative approaches to risk analysis, including calculating a fire and explosion index. The document concludes by discussing hazard management strategies like preventative measures, control measures, fire protection, relief operations, and the importance of training personnel on safety.
Review study on performance of seismically tested repaired shear wallseSAT Publishing House
This document summarizes research on the performance of reinforced concrete shear walls that have been repaired after damage. It begins with an introduction to shear walls and their failure modes. The literature review then discusses the behavior of original shear walls as well as different repair techniques tested by other researchers, including conventional repair with new concrete, jacketing with steel plates or concrete, and use of fiber reinforced polymers. The document focuses on evaluating the strength retention of shear walls after being repaired with various methods.
Monitoring and assessment of air quality with reference to dust particles (pm...eSAT Publishing House
This document summarizes a study on monitoring and assessing air quality with respect to dust particles (PM10 and PM2.5) in the urban environment of Visakhapatnam, India. Sampling was conducted in residential, commercial, and industrial areas from October 2013 to August 2014. The average PM2.5 and PM10 concentrations were within limits in residential areas but moderate to high in commercial and industrial areas. Exceedance factor levels indicated moderate pollution for residential areas and moderate to high pollution for commercial and industrial areas. There is a need for management measures like improved public transport and green spaces to combat particulate air pollution in the study areas.
Low cost wireless sensor networks and smartphone applications for disaster ma...eSAT Publishing House
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Embedded machine learning-based road conditions and driving behavior monitoring
Sequences classification based on group technology
1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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SEQUENCES CLASSIFICATION BASED ON GROUP TECHNOLOGY
FOR FLEXIBLE MANUFACTURING CELL DESIGN
Akbib Maha1
, Amrani Ghacham Abdellatif2
, Sedqui Abdelfettah3
1
Phd student in logistics, Innovative Technologies Laboratory, ENSAT, Tangier, Morocco, maha.akbib@gmail.com
2
Professor of electronic engineering, Physics Department, ENSAT, Tangier, Morocco, ab_amrani@yahoo.fr
3
Professor of the industrial and logistic engineering, Physics Department, ENSAT, Tangier, Morocco,
abdelfettah.sedqui@gmail.com
Abstract
Flexible cell formation is based on Group Technology. Group Technology rests on the exploitation of resemblances between products
or processes, which makes the identification of products’ families and machines’ cells easier. We propose a new approach based on
the language theory for product family grouping according to their manufacturing sequences. This approach uses linear sequences of
the manufacturing products which are assimilated to the words of a language. We have chosen the Levenhstein distance for sequence
classification. We are going to compare our method to Dice-Czekanowski and Jaccard’s methods and apply the vectorial correlation
coefficient as a comparison tool between two hierarchical classifications.
Keywords: manufacturing sequences, language theory, hierarchical classification, Group Technology.
-----------------------------------------------------------------------***-----------------------------------------------------------------------
1. INTRODUCTION
Because of the diverse needs of the customers and the
proliferation of the product, the manufacturers are faced to
difficulties treating the frequent change of the conception and
the recurring variations of the processes, which increase the
complexity of the product and the structures of production [1]
[2]. The development of multiple products based on product
families sharing a common platform was well recognized as a
successful approach in many industries [3].
The Group Technology (GT) is an organization principle
which can be applied to all the domains of an industrial
company. This principle rests on the combination of identical
or similar components to define groups, classes or families by
using a system of classification [4]. The purpose is to
decompose the industrial system into sub-systems which are
easier to control.
The main stage in the design of industrial systems is to group
products into families and machines into cells in which one or
several product families are made [5]. A family of product is a
collection of the products which are similar as regards their
geometrical forms, their dimensions and/or the presentation of
similar stages in the manufacturing process. This work
considers the last criterion. The number of studies dedicated to
the determination of product families by taking into account
the order of the operations is limited [6] [4] [7] [8] [9]. This is
due to the difficulty of determining a resemblance measure
verifying some severe criteria [10] as to know the non-
coincidence of operation, the order of operation, the
permutation of operation and the number of operation. With
the aim of designing manufacturing systems, we propose a
new approach based on the theory of language for the
determination of sequences families. It takes into account all
the previous approaches based on the typological analysis and
more particularly the hierarchical classification.
Thus, in the 2nd
part, we propose a measure of resemblance for
the sequences classification, suiting in the industrial case and
answering the above-mentioned criteria [4] [10]. In the 3rd
part, the results of the method and the interpretations are
presented. And as regards the 4th
and last part, it will contain
the comparison between our method and the methods of
Jaccard [11] and Dice-Czekanowski [12].
2. THE PROPOSED MEASURE OF
RESEMBLANCE
Several approaches were developed to identify product
families and the associated machine cells. These approaches
can be classified according to two groups [13]:
• Approaches based on the characteristics of the
product,
• Approaches based on the methods of fabrication.
These approaches use measures of resemblance applied in
search of the product families and the machine cells. Two
components are necessary [14]:
• A metric (the distance, the index of similarity…),
• A classification algorithm.
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2.1 The Language Theory Approach
For the grouping of products in families, it is reasonable to
develop partitions by making comparisons between the ranges
of manufacturing [15]. To this end, the treated sequences are
linear sequences which are similar as for their manufacturing
process. The measure of resemblance proposed for the
classification of these sequences has to verify the following
criteria [4] [10]:
Table -1: The four criterion
Physical
criterion
Property
C1:Non-
coincidence
The more the non-coincidence
increases, the more the index of
similarity grows
C2:Order of
the operations
The order of the operations is
faithfully translated
C3:Permutatio
n
The permutation of two consecutive
phases has less incidence on the index
than any other permutation
C4:Number of
operations by
sequence
The difference of K operations
between two short sequences must
have more influence on the index than
for two long sequences
To solve this problem, we notice the analogy existing between
the words of a language and linear sequences of products.
Accordingly, we propose the assimilation of the product
sequences to the words of a language which is defined by
using an alphabet (a set of machine operations).
We choose the balanced Levenhstein distance, so called the
distance of edition [16] which verifies the above criteria, see
the table 2 at the end of the chapter 2.
2.2 Calculation of the Distance and the Application to
the Manufacturing Sequences
The following definitions will be used:
• A linear sequence is defined as a sequence in which
the operations are executed in the sequential order.
• An empty operation is an operation which
corresponds to a no letter in the theory of language.
• An empty sequence corresponds to a no word in the
theory of language.
Three operations are used for the calculation of the edition
distance between the sequences S1 and S2:
• The substitution of an operation b of the sequence S2
by an operation a of the sequence S1, noted a → b
and the cost of which is c (a, b),
• The insertion of an operation in a manufacturing
sequence, µ → a, the cost of which is c (a,µ) with µ
the empty operation,
• The deletion of an operation of a manufacturing
sequence, a → µ, the cost of which is c (a, µ), µ the
empty operation.
Example
The sequence S1 = ab can be changed in sequence S2 = bac by
the following set of elementary operations:
(µ →c), (b→ µ), (c→ b), (µ→ c)
Which corresponds to the stages of transformation: ab, cab, ca,
ba, bac. The cost of this transformation which is not optimal
is:
c(µ, c)+c(b, µ)+c(c, b)+c(µ, c)
The distance d (S1, S2) is the cheapest order of the elementary
transformation necessary to change S1 in S2. To calculate d
(S1, S2) and avoid the combinatorial explosion, we have to
consider the natural constraint: d (a, b) = c (a, b) which
consists in replacing an operation a by the operation b
implying the triangular disparity: c(a,b)+c(b,e) ≥ c(a,e)
This condition allows the determination of the minimal cost
transformation in a finite set.
The transformation of the succession corresponds at the
minimum of necessary steps to change S1 in S2, using the
three operations described below. As an example, the final
result is represented in the following way:
S1= a1 a2 a3 ... an µ
| | | | |
S2= µ b1 b2 ...bn-1 bn
The operations connected by a line indicate a substitution. The
operations connected with the empty operation µ are insertions
or deletions. It is as well compulsory as two lines do not have
to cross inside a sequence and do not particularly have to
begin of (or to end on) the same operation.
S1 is thus transformed into S2 by:
(a1 → µ), (a2 → b1 ),..., (an→ bn-1 ), (µ → bn )
2.2.1 Property [17]:
The cost of a minimal cost transformation is equal to the cost
of a minimal cost succession.
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Thus, the particular shape of successions allows the
introduction of a recursion relation with the minimal cost
transformation.
S1= a1 ... an
S2= b1 ...bm
S1( i ) = a1 ... ai
D(i, j) = d( S1( i ), S2( j ))
D( i-1, j-1) + c( ai , bj )
D(i, j) = min D( i-1, j) + c( ai ,µ)
D( i, j-1) + c( µ, bj )
2.2.2 Algorithm for the Calculation of the Distance:
The additivity of the criterion of cost as for the elementary
cost assures that a method of dynamic programming can be
then used. It is translated by the following algorithm [16]:
1) D( 0, 0 ) = 0
2) for i:=1 to n do
D( i, 0 ):= D( i-1, 0 ) + c( ai , µ )
3) for j:= 1 to m do
D( 0, j):= D( 0, j-1) + c( µ, bj )
4) for i:=1 to n do
for j:=1 to m do
D( i-1, j-1) + c( ai , bj )
D(i, j) = min D( i-1, j) + c( ai ,µ)
D( i, j-1) + c( µ, bj )
5) d( S1, S2 ) = D( n, m ).
2.2.3 Example of Execution:
Let O = {a, b, c, d} be the set of operations to be executed on
machines A, B, C and D. And let two manufacturing
sequences S1 = a a b a c d and S2 = a b d, c(x, y) = 1 for every
x, y ∈O ∪ {µ} and x ≠ y, c(x, x) = 0 for every x ∈O.
The execution step by step of the algorithm of [16] gives the
table 2, whose last element represents the result.
Table -2: Distance between sequences abd et aabacd
µ a a b a C d
µ 0 1 2 3 4 5 6
a 1 0 1 2 3 4 5
b 2 1 1 1 2 3 4
d 3 2 2 2 2 3 3
Sequence corresponding to a distance of 3 between S1 and S2:
a a b a c d
| | | | | |
a µ b µ µ d
Remark:
The links correspond to a minimal path by the matrix of
distance from the first element to the last one, see table 2.
This distance verifies exactly the above mentioned criteria, as
indicated in the table 3:
Table-3:Verification of the criteria by the proposed distance
Criteria sequences distance
non-coincidence S1= abc S2= afc
S1= abc S2= efg
d(S1, S2) = 1
d(S1, S2) = 3
permutation S1= abc S2= acb
S1= acb S2= cab
d(S1, S2) = 2
d(S1, S2) = 2
Operations order S1= abc S2= abc
S1= abc S2= bac
d(S1, S2) = 0
d(S1, S2) = 2
Number of the
operations in a
sequence
S1= abc S2= a
S1= abc S2= ab
d(S1, S2) = 2
d(S1, S2) = 1
3. RESULTS, VALIDATION AND
INTERPRETATION
3.1. Basic Data
We proposed the consideration of linear sequences as being
similar to the words of a language. As a consequence, a light
modification in their representation is necessary with regard to
the previous work. To estimate the results of the method, we
apply the proposed distance to the sequences described in the
table 4. The sequences are noted Si, with i=1… 31.
Table -4: Examples of linear sequences
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The distance of edition was applied to these sequences with
the following conditions:
• c(a, a) = 0 for every operation,
• c(a,b) = 1 with a≠b (in this case the operations of
transformation : insertion, substitution and deletion
are applied) for every operation b ∈ O ∪ { µ }.
We obtain a matrix of distances which we are going to use for
the determination of the classification tree. By putting Si=i
and by applying the algorithm of ascending hierarchical
classification which takes as criterion of aggregation the
average link, we arrive at the following dendrogramme (figure
1):
Fig -1: Hierarchical classification P1 of sequences with
Levenhstein distance
3.2. The Sequences Families
The determination of sequences families requires the cut of the
classification tree in the appropriate threshold.
The determination of the threshold α is easy. When we choose
α = 6, we obtain four families of sequences described in the
table 5. Tables 5.a, 5.b, 5.c and 5.d specify elements and
profile of every family;
Table -5: families obtained with α =6
Family n° 1:
number of sequences 16,
51.6 % of the total number.
F1={ 1, 2, 3, 4, 5, 6, 9, 10, 13,
20, 22, 23, 24, 25, 29, 31 }
Family n° 2:
number of sequences 4,
12.9% of the total number.
F2={ 11, 16, 17, 19 }
Family n° 3:
number of sequences 3,
9.6% of the total number.
F3={ 12, 14, 15}
Family n° 4:
number of sequences 8,
25.8% of the total number.
F4={ 7, 8, 18, 21, 26, 27, 28,
30}
Table -5.a: Elements and profile of the family F1
sequences sequences
------------ ------------
S1 TEHKSF S13 ACPEHK
S2 TCHKF S20 ABHKL
S3 TDCHKF S22 ACHKLF
S4 TCGHK S23 ACHKF
S5 TDCHKEF S24 AEGHKF
S6 TCIHKMEF S25 ACHKF
S9 TDCHKLEF S29 ABK
S10 TDCHKLEF S31 ACHKEF
Profile of family F1: Short sequences characterized by
the occurrence of successions CHKF and AHK
Table -5.b : Elements and profile of the family F2
Table -5.c : Elements and profile of the family F3
Table -5.d : Elements and profile of the family F4
sequences sequences
------------ ------------
S7 TCHKMUQFN S26 ABHKMIQFN
S8 TCHKMUQFN S27 ADHKLEMIQFN
S18 AEKLIHFN S28 ADHKLEMIQFN
S21 AEHKSMIQFN S30 ABHKLMIFN
Profile of family F4: Short sequences characterized by
the occurrence of successions HKMFN and AKIFN
4. COMPARISON
We are going to compare our hierarchical classification,
obtained by the use of the distance of Levenhstein, to those
obtained by using:
sequences sequences
----------- -----------
S11 ABPEHIKM S17 ADPEGKJNRQ
S16 ADPEGKJN S19 ABKMGIJN
Profile of family F2 : Long sequences characterized by
the occurrence of the succession APEK
Sequences
-----------
S12 ACPEHKLMOJRQSN
S14 ADPEHKLSMOQN
S15 ACPEHKMORQN
Profile of family F3 : Long sequences characterized by
the occurrence of the succession APEHKMOQN
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Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 549
• Dice-Czekanowski distance [12], (figure 2)
• Jaccard distance [11], (figure 3)
Fig -2: Hierarchical classification P2 of sequences with
Jaccard distance
Fig -3: Hierarchical classification P3 of sequences with Dice-
Czekanowski distance
In the same way, we cut these two hierarchical classifications.
We choose α = 0.8 for figure 3 and α = 0.87 for figure 2.
Then we obtain four sequences families described in tables 6
and 7.
Table -6: families obtained with α =0,87 and Jaccard distance
Family n° 1:
number of sequences 16,
51.6 % of the total number.
F1={ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
13, 22, 23, 24, 25, 31 }
Family n° 2:
number of sequences 3,
9.6 % of the total number.
F2={ 16, 17, 19 }
Family n° 3:
number of sequences 10,
32.2 % of the total number.
F3={ 11, 12, 14, 15, 18, 21, 26,
27, 28, 30 }
Family n° 4:
number of sequences 2,
6.4 % of the total number.
F4={ 20, 29 }
Table -7: families obtained with α =0,8 and Dice-
Czekanowski distance
Family n° 1:
number of sequences 16,
51.6 % of the total number.
F1={ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
13, 22, 23, 24, 25, 31 }
Family n° 2:
number of sequences 3,
9.6 % of the total number.
F2={ 16, 17, 19 }
Family n° 3:
number of sequences 10,
32.2 % of the total number.
F3={ 11, 12, 14, 15, 18, 21, 26,
27, 28, 30 }
Family n° 4:
number of sequences 2,
6.4 % of the total number.
F4={ 20, 29 }
To compare the 3 classifications P1, P2 and P3, we are going
to use the index of vectorial correlation RV [18]. This index is
formulated as follows [19]:
1, 2
∑ ,
∑ ∑ ²,,
With : Ck is the relational table associated with Pk, whose
general term is defined by :
1 ! " # $ % & ' # &
0 & #)
We find that: RV (P1,P2) = 0.7259
RV (P1,P3) = 0.7259
RV (P2,P3) = 1
Thus, as regards classifications P2 (distance of Jaccard) and
P3 (distance of Dice-Czekanowski), they are identical, The
only difference is that the distance of Dice-Czekanowski
allows a better spreading and a better discrimination. It can be
explained by the fact that these two distances can be put under
the general shape [12]:
D=
*
∝,-*
With: respectively ∝ 2 ! ∝ 1 for Dice-Czekanowski
and Jaccard.
P is the copresence
N is the non-coincidence
The coefficient RV between P1, P2 and P1, P3 is big enough
to judge that the hierarchical classifications are nearby.
6. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 02 Issue: 12 | Dec-2013, Available @ http://www.ijret.org 550
CONCLUSIONS
The theory of language approach opens a very interesting
direction for the determination of families of product. On one
hand, it allows the resolution of the representation problem of
operations which are repeated several times in an order. Thus
the method eliminates the distribution of error in the
calculation of distance and, accordingly, in the results of
classification process. On the other hand, this approach
allowed the adaptation of the Levenhstein balanced distance in
the case of the linear manufacturing sequences. The distance
verifies the criteria underlined by [4] and [10] for the
determination of product family. The distance:
• Applies to the sequences of different lengths,
• Takes into account permutations of operations,
• Takes into account the order of operations,
• Does not take into account the co-absences, which
can increase the similarity of the sequences.
This is due to the conception of the distance which is based on
three fundamental operations: substitution, insertion and
deletion of elements. Besides, the distance uses directly raw
data without transcoding.
For the determination of the sequences families, the frankness
of the threshold determination, allows the introduction of new
subjective criteria for the characterization of product family.
This approach opens new perspectives for the representation
of sequences families by means of finite state automaton.
Then the decision-making for the classification of new
products becomes simpler and makes the search for the main
sequences more determined.
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