In this paper, time signal analysis and synthesis based on modified Haar and modified Daubechies wavelet transform is proposed. The optimal results for both analysis and synthesis for time domain signals were obtained with the use of the modified Haar and modified Daubechies wavelet transforms. This paper evaluates the quality of filtering using the modified Haar and modified Daubechies wavelet transform. Analysis and synthesis of the time signals is performed for 10 samples and the signal to noise ratio (SNR) of around 25-40 dB is obtained for modified Haar and 24-32 dB for modified Daubechies wavelet. We have observed that as compared to standard Haar and standard Daubechies mother wavelet our proposed method gives better signal quality, which is good for time varying signals.
HEATED WIND PARTICLE’S BEHAVIOURAL STUDY BY THE CONTINUOUS WAVELET TRANSFORM ...cscpconf
Nowadays Continuous Wavelet Transform (CWT) as well as Fractal analysis is generally used for the Signal and Image processing application purpose. Our current work extends the field of application in case of CWT as well as Fractal analysis by applying it in case of the agitated wind particle’s behavioral study. In this current work in case of the agitated wind particle, we have mathematically showed that the wind particle’s movement exhibits the “Uncorrelated” characteristics during the convectional flow of it. It is also demonstrated here by the Continuous Wavelet Transform (CWT) as well as the Fractal analysis with matlab 7.12 version
Wavelet neural network conjunction model in flow forecasting of subhimalayan ...iaemedu
This document summarizes a study that uses a wavelet-neural network (WLNN) conjunction model for river flow forecasting of the Brahmaputra River in India. The model decomposes river discharge time series data into multiresolution time series using discrete wavelet transforms. These decomposed time series are then used as inputs to an artificial neural network (ANN) to forecast river flows at different lead times. The results of the WLNN model are compared to those of a single ANN model. The WLNN model is found to provide more accurate and consistent predictions than the ANN model alone due to its use of multiresolution time series data as inputs.
Tomography is important for network design and routing optimization. Prior approaches require either
precise time synchronization or complex cooperation. Furthermore, active tomography consumes explicit
probing resulting in limited scalability. To address the first issue we propose a novel Delay Correlation
Estimation methodology named DCE with no need of synchronization and special cooperation. For the
second issue we develop a passive realization mechanism merely using regular data flow without explicit
bandwidth consumption. Extensive simulations in OMNeT++ are made to evaluate its accuracy where we
show that DCE measurement is highly identical with the true value. Also from test result we find that
mechanism of passive realization is able to achieve both regular data transmission and purpose of
tomography with excellent robustness versus different background traffic and package size.
Analysis of single server fixed batch service queueing system under multiple ...Alexander Decker
This document analyzes a single server queueing system with fixed batch service, multiple vacations, and the possibility of catastrophes. The system uses a Poisson arrival process and exponential service times. The server provides service in batches of size k. If fewer than k customers remain after service, the server takes an exponential vacation. If a catastrophe occurs, all customers are lost and the server vacations. The document derives the generating functions and steady state probabilities for the number of customers when the server is busy or vacationing. It also provides closed form solutions for performance measures like mean number of customers and variance. Numerical studies examine these measures for varying system parameters.
Numerical solution of fuzzy hybrid differential equation by third order runge...Alexander Decker
This document presents a numerical method for solving hybrid fuzzy differential equations using the third order Runge-Kutta Nystrom method. It begins with definitions of fuzzy numbers and fuzzy differential equations. It then describes hybrid fuzzy differential systems and develops the Runge-Kutta Nystrom method for approximating their solutions. The method is applied to an example hybrid fuzzy differential equation and results are presented in a table and figure comparing the approximate and exact solutions. The document concludes by discussing the accuracy of the method.
11.numerical solution of fuzzy hybrid differential equation by third order ru...Alexander Decker
This document presents a numerical method for solving hybrid fuzzy differential equations using the third order Runge-Kutta Nystrom method. It begins with introductions to fuzzy numbers, fuzzy differential equations, and hybrid fuzzy differential systems. It then describes the third order Runge-Kutta Nystrom method for solving hybrid fuzzy differential equations. An example is provided to illustrate the method. Tables and figures compare the approximate solutions from this method to exact solutions. The method is shown to provide approximations close to the exact solutions.
11.[8 17]numerical solution of fuzzy hybrid differential equation by third or...Alexander Decker
This document presents a numerical method called the third order Runge Kutta Nystrom method to solve fuzzy hybrid differential equations. It begins with definitions of fuzzy numbers and fuzzy functions. It then describes hybrid fuzzy differential systems and how they can be modeled as piecewise differentiable systems. The document goes on to develop the third order Runge Kutta Nystrom method for solving these systems numerically. It provides a convergence result and applies the method to a numerical example to illustrate the theory.
Congestion Control through Load Balancing Technique for Mobile Networks: A Cl...IDES Editor
The Optimal Routing Path (ORP) for mobile
cellular networks is proposed in this paper with the
introduction of cluster-based approach. Here an improved
dynamic selection procedure is used to elect cluster head.
The cluster head is only responsible for the computation of
least congested path. Hence the delay is reduced with the
significant reduction on the number of backtrackings.
HEATED WIND PARTICLE’S BEHAVIOURAL STUDY BY THE CONTINUOUS WAVELET TRANSFORM ...cscpconf
Nowadays Continuous Wavelet Transform (CWT) as well as Fractal analysis is generally used for the Signal and Image processing application purpose. Our current work extends the field of application in case of CWT as well as Fractal analysis by applying it in case of the agitated wind particle’s behavioral study. In this current work in case of the agitated wind particle, we have mathematically showed that the wind particle’s movement exhibits the “Uncorrelated” characteristics during the convectional flow of it. It is also demonstrated here by the Continuous Wavelet Transform (CWT) as well as the Fractal analysis with matlab 7.12 version
Wavelet neural network conjunction model in flow forecasting of subhimalayan ...iaemedu
This document summarizes a study that uses a wavelet-neural network (WLNN) conjunction model for river flow forecasting of the Brahmaputra River in India. The model decomposes river discharge time series data into multiresolution time series using discrete wavelet transforms. These decomposed time series are then used as inputs to an artificial neural network (ANN) to forecast river flows at different lead times. The results of the WLNN model are compared to those of a single ANN model. The WLNN model is found to provide more accurate and consistent predictions than the ANN model alone due to its use of multiresolution time series data as inputs.
Tomography is important for network design and routing optimization. Prior approaches require either
precise time synchronization or complex cooperation. Furthermore, active tomography consumes explicit
probing resulting in limited scalability. To address the first issue we propose a novel Delay Correlation
Estimation methodology named DCE with no need of synchronization and special cooperation. For the
second issue we develop a passive realization mechanism merely using regular data flow without explicit
bandwidth consumption. Extensive simulations in OMNeT++ are made to evaluate its accuracy where we
show that DCE measurement is highly identical with the true value. Also from test result we find that
mechanism of passive realization is able to achieve both regular data transmission and purpose of
tomography with excellent robustness versus different background traffic and package size.
Analysis of single server fixed batch service queueing system under multiple ...Alexander Decker
This document analyzes a single server queueing system with fixed batch service, multiple vacations, and the possibility of catastrophes. The system uses a Poisson arrival process and exponential service times. The server provides service in batches of size k. If fewer than k customers remain after service, the server takes an exponential vacation. If a catastrophe occurs, all customers are lost and the server vacations. The document derives the generating functions and steady state probabilities for the number of customers when the server is busy or vacationing. It also provides closed form solutions for performance measures like mean number of customers and variance. Numerical studies examine these measures for varying system parameters.
Numerical solution of fuzzy hybrid differential equation by third order runge...Alexander Decker
This document presents a numerical method for solving hybrid fuzzy differential equations using the third order Runge-Kutta Nystrom method. It begins with definitions of fuzzy numbers and fuzzy differential equations. It then describes hybrid fuzzy differential systems and develops the Runge-Kutta Nystrom method for approximating their solutions. The method is applied to an example hybrid fuzzy differential equation and results are presented in a table and figure comparing the approximate and exact solutions. The document concludes by discussing the accuracy of the method.
11.numerical solution of fuzzy hybrid differential equation by third order ru...Alexander Decker
This document presents a numerical method for solving hybrid fuzzy differential equations using the third order Runge-Kutta Nystrom method. It begins with introductions to fuzzy numbers, fuzzy differential equations, and hybrid fuzzy differential systems. It then describes the third order Runge-Kutta Nystrom method for solving hybrid fuzzy differential equations. An example is provided to illustrate the method. Tables and figures compare the approximate solutions from this method to exact solutions. The method is shown to provide approximations close to the exact solutions.
11.[8 17]numerical solution of fuzzy hybrid differential equation by third or...Alexander Decker
This document presents a numerical method called the third order Runge Kutta Nystrom method to solve fuzzy hybrid differential equations. It begins with definitions of fuzzy numbers and fuzzy functions. It then describes hybrid fuzzy differential systems and how they can be modeled as piecewise differentiable systems. The document goes on to develop the third order Runge Kutta Nystrom method for solving these systems numerically. It provides a convergence result and applies the method to a numerical example to illustrate the theory.
Congestion Control through Load Balancing Technique for Mobile Networks: A Cl...IDES Editor
The Optimal Routing Path (ORP) for mobile
cellular networks is proposed in this paper with the
introduction of cluster-based approach. Here an improved
dynamic selection procedure is used to elect cluster head.
The cluster head is only responsible for the computation of
least congested path. Hence the delay is reduced with the
significant reduction on the number of backtrackings.
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.
Algorithm to Generate Wavelet Transform from an Orthogonal TransformCSCJournals
This paper proposes algorithm to generate discrete wavelet transform from any orthogonal transform. The wavelet analysis procedure is to adopt a wavelet prototype function, called an analyzing wave or mother wave. Other wavelets are produced by translation and contraction of the mother wave. By contraction and translation infinite set of functions can be generated. This set of functions must be orthogonal and this condition qualifies a transform to be a wavelet transform. Thus there are only few functions which satisfy this condition of orthogonality. To simplify this situation, this paper proposes a generalized algorithm to generate discrete wavelet transform from any orthogonal transform. For an NxN orthogonal transform matrix T, element of each row of T is repeated N times to generate N Mother waves. Thus rows of original transform matrix become wavelets. As an example we have illustrated the procedure of generating Walsh wavelet called ‘Walshlet’ from Walsh transform. Since data compression is one of the best applications of wavelets, we have implemented image compression using Walsh as well as Walshlet. Our experimental results show that performance of image compression technique using Walshlet is much better than that of standard Walsh transform. More over image reconstructed from Walsh transform has some blocking artifact, which is not present in the image reconstructed from Walshlet. Similarly image compression using DCT and DCT Wavelet has been implemented. Again the results of DCT Wavelet have been proved to perform better than normal DCT
Ch2 probability and random variables pg 81Prateek Omer
This document discusses probability and random variables. It begins by defining key terms like random experiment, random event, sample space, mutually exclusive events, union and intersection of events, occurrence of an event, and complement of an event. It then discusses definitions of probability, including the relative frequency definition and classical definition. It also covers conditional probability, Bayes' theorem, and statistical independence. The key concepts of probability theory and random variables are introduced to enable analysis and characterization of random signals.
Prévision consommation électrique par processus à valeurs fonctionnellesCdiscount
The document discusses predicting functional time series. It introduces functional data as slices of a continuous stochastic process over time. The goal is to predict future values of this process given past observations. An autoregressive Hilbertian process of order 1 is proposed, where the current value is a linear function of the past value plus noise. Under certain conditions, this defines a strictly stationary process whose best predictor is the past value multiplied by the linear operator. The document outlines clustering functional data using wavelets and applying these methods to predict electricity demand.
Ch7 noise variation of different modulation scheme pg 63Prateek Omer
This document summarizes the noise performance of various modulation schemes. It begins by introducing a receiver model and defining figures of merit used to evaluate performance. It then analyzes the noise performance of coherent demodulation for DSB-SC and SSB modulation. The following key points are made:
1) Coherent detection of DSB-SC signals results in signal and noise being additive at both the input and output of the detector. The detector completely rejects the quadrature noise component.
2) For DSB-SC, the output SNR and reference SNR are equal, resulting in a figure of merit of 1.
3) Analysis of SSB modulation shows it achieves a 3 dB improvement in output SNR over
Electron-phonon coupling describes the interaction between electrons and phonons in materials. It can be calculated using density functional perturbation theory to obtain the electron-phonon matrix elements and phonon frequencies. This allows calculating temperature-dependent corrections to electronic band structures and optical properties within many-body perturbation theory. Yambo software implements these methods, calculating temperature renormalization of quasi-particle energies and broadening, as well as finite-temperature excitons and dielectric functions.
A C OMPARATIVE A NALYSIS A ND A PPLICATIONS O F M ULTI W AVELET T RANS...IJCI JOURNAL
In the era of telemedicine a large amount of medica
l information is exchanged via electronic media mos
tly
in the form of medical images, to improve the accur
acy and speed of diagnosis process. Medical Image
denoising has the basic importance in image analysi
s as these algorithm and procedures affects the eff
icacy
of medical diagnostic. In this paper focus is on Mu
lti wavelets based Image denoising techniques, beca
use
they provide the possibility of designing wavelets
systems which are orthogonal, symmetric and compact
ly
supported, simultaneously. Performance of Discrete
Multi Wavelet Transform and Discrete Wavelet
Transform based denoising methods are compared on t
he basis of PSNR
This document introduces the concept of random processes and provides examples to illustrate them. It defines a random process as a probability system composed of a sample space, an ensemble of time functions, and a probability measure. Random processes extend the concept of a random variable to incorporate the time parameter. Examples given include coin tossing, throwing a die, and thermal noise voltages across resistors. A random process is said to be stationary if its joint probability distribution is invariant to time shifts. Stationary processes have the property that the probability of waveforms passing through time-shifted windows remains the same. An example of a non-stationary process is also provided.
In this research paper, specific reaction rates of first order, second order; third order and m th order reactions are represented in terms of factorial function. These results would be further applied to obtain half life period as a particular case in application section.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
This document provides an overview of local mode analysis. It discusses how normal vibrational modes are delocalized and how local modes can be derived to describe individual bond vibrations. The document outlines Konkoli-Cremer local vibrational modes and describes how normal mode frequencies, force constants, and local mode frequencies are related. It also explains how to run the local mode program, generate bar diagrams and adiabatic connection schemes to analyze the relationship between normal and local modes.
The document describes a study that uses fuzzy logic to predict porosity from well log data. It discusses (1) normalizing the input data, (2) using subtractive clustering to identify clusters and membership functions, and (3) developing fuzzy rules with Gaussian membership functions to relate inputs like density, sonic, and neutron logs to the output of porosity. The results showed fuzzy logic predictions of porosity were more accurate than those from multiple linear regression on the same well log data.
Schedulability Analysis for a Combination of Non-Preemptive Strict Periodic T...IOSR Journals
This document discusses schedulability analysis for a combination of non-preemptive strict periodic tasks and preemptive sporadic tasks under fixed priority scheduling. It first reviews related work and defines the task models. It then presents a necessary and sufficient schedulability condition for non-preemptive strict periodic tasks and characterizes the transient and permanent phases of their schedule. Finally, it shows that the worst-case release times for sporadic tasks, from which their worst-case response times can be computed, occur only during the permanent phase of the strict periodic tasks.
This thesis examines the return interval distribution of extreme events in long memory time series that have two different scaling exponents. It first reviews long memory processes and their characterization using fractional autoregressive integrated moving average (ARFIMA) models. It then derives an analytical expression for the return interval distribution when the time series has two scaling exponents, as supported by numerical simulations. The thesis also considers a long memory probability process with two exponents and compares the return interval distribution to analytical results.
A COMPARISON OF PARTICLE SWARM OPTIMIZATION AND DIFFERENTIAL EVOLUTIONijsc
Two modern optimization methods including Particle Swarm Optimization and Differential Evolution are
compared on twelve constrained nonlinear test functions. Generally, the results show that Differential
Evolution is better than Particle Swarm Optimization in terms of high-quality solutions, running time and
robustness.
USING LEARNING AUTOMATA AND GENETIC ALGORITHMS TO IMPROVE THE QUALITY OF SERV...IJCSEA Journal
A hybrid learning automata–genetic algorithm (HLGA) is proposed to solve QoS routing optimization problem of next generation networks. The algorithm complements the advantages of the learning Automato Algorithm(LA) and Genetic Algorithm(GA). It firstly uses the good global search capability of LA to generate initial population needed by GA, then it uses GA to improve the Quality of Service(QoS) and acquiring the optimization tree through new algorithms for crossover and mutation operators which are an NP–Complete problem. In the proposed algorithm, the connectivity matrix of edges is used for genotype representation. Some novel heuristics are also proposed for mutation, crossover, and creation of random individuals. We evaluate the performance and efficiency of the proposed HLGA-based algorithm in comparison with other existing heuristic and GA-based algorithms by the result of simulation. Simulation results demonstrate that this paper proposed algorithm not only has the fast calculating speed and high accuracy but also can improve the efficiency in Next Generation Networks QoS routing. The proposed algorithm has overcome all of the previous algorithms in the literature..
This document presents a comparative study of monotonic and non-monotonic phase linear time-invariant (LTI) systems using an improved analytical PID controller design. It discusses using gain crossover frequency and phase margin specifications to design controllers that ensure minimum phase margin inside the desired bandwidth. For the comparative study, it uses bode stability criterion, Nyquist stability criterion, and unit step response. It presents a case study comparing the design of controllers for a buck converter system, which exhibits a non-monotonic phase response, using both monotonic and non-monotonic design techniques. The results show that treating the non-monotonic system as monotonic leads to an overvalued proportional gain and undervalued derivative gain in the PID controller.
The document describes several alternative models for information retrieval, including fuzzy set models, extended Boolean models, generalized vector space models, latent semantic indexing models, neural network models, and Bayesian network models. It provides details on fuzzy set models that allow gradual membership in sets, extended Boolean models that combine Boolean queries with vector space characteristics, and Bayesian networks that use directed acyclic graphs and conditional probabilities.
The document provides an overview and history of the wavelet transform. It can be summarized as follows:
1. The wavelet transform was developed to address limitations of the Fourier transform and short-time Fourier transform in analyzing signals both in time and frequency. It uses wavelets of limited duration that can be scaled and translated.
2. The history of the wavelet transform began in 1909 with Haar wavelets. The concept of wavelets was then proposed in 1981 and the term was coined in 1984. Important developments included the construction of additional orthogonal wavelets in 1985, the proposal of the multiresolution concept in 1988, and the fast wavelet transform algorithm in 1989, enabling numerous applications.
3.
Wavelets are mathematical functions. The wavelet transform is a tool that cuts up data, functions or operators into different frequency components and then studies each component with a resolution matched to its scale. It is needed, because analyzing discontinuities and sharp spikes of the signal and applications as image compression, human vision, radar, and earthquake prediction. Wai Mar Lwin | Thinn Aung | Khaing Khaing Wai "Applications of Wavelet Transform" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27958.pdfPaper URL: https://www.ijtsrd.com/mathemetics/applied-mathematics/27958/applications-of-wavelet-transform/wai-mar-lwin
Packets Wavelets and Stockwell Transform Analysis of Femoral Doppler Ultrasou...IJECEIAES
Ultrasonic Doppler signals are widely used in the detection of cardiovascular pathologies or the evaluation of the degree of stenosis in the femoral arteries. The presence of stenosis can be indicated by disturbing the blood flow in the femoral arteries, causing spectral broadening of the Doppler signal. To analyze these types of signals and determine stenosis index, a number of time-frequency methods have been developed, such as the short-time Fourier transform, the continuous wavelets transform, the wavelet packet transform, and the S-transform
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.
Algorithm to Generate Wavelet Transform from an Orthogonal TransformCSCJournals
This paper proposes algorithm to generate discrete wavelet transform from any orthogonal transform. The wavelet analysis procedure is to adopt a wavelet prototype function, called an analyzing wave or mother wave. Other wavelets are produced by translation and contraction of the mother wave. By contraction and translation infinite set of functions can be generated. This set of functions must be orthogonal and this condition qualifies a transform to be a wavelet transform. Thus there are only few functions which satisfy this condition of orthogonality. To simplify this situation, this paper proposes a generalized algorithm to generate discrete wavelet transform from any orthogonal transform. For an NxN orthogonal transform matrix T, element of each row of T is repeated N times to generate N Mother waves. Thus rows of original transform matrix become wavelets. As an example we have illustrated the procedure of generating Walsh wavelet called ‘Walshlet’ from Walsh transform. Since data compression is one of the best applications of wavelets, we have implemented image compression using Walsh as well as Walshlet. Our experimental results show that performance of image compression technique using Walshlet is much better than that of standard Walsh transform. More over image reconstructed from Walsh transform has some blocking artifact, which is not present in the image reconstructed from Walshlet. Similarly image compression using DCT and DCT Wavelet has been implemented. Again the results of DCT Wavelet have been proved to perform better than normal DCT
Ch2 probability and random variables pg 81Prateek Omer
This document discusses probability and random variables. It begins by defining key terms like random experiment, random event, sample space, mutually exclusive events, union and intersection of events, occurrence of an event, and complement of an event. It then discusses definitions of probability, including the relative frequency definition and classical definition. It also covers conditional probability, Bayes' theorem, and statistical independence. The key concepts of probability theory and random variables are introduced to enable analysis and characterization of random signals.
Prévision consommation électrique par processus à valeurs fonctionnellesCdiscount
The document discusses predicting functional time series. It introduces functional data as slices of a continuous stochastic process over time. The goal is to predict future values of this process given past observations. An autoregressive Hilbertian process of order 1 is proposed, where the current value is a linear function of the past value plus noise. Under certain conditions, this defines a strictly stationary process whose best predictor is the past value multiplied by the linear operator. The document outlines clustering functional data using wavelets and applying these methods to predict electricity demand.
Ch7 noise variation of different modulation scheme pg 63Prateek Omer
This document summarizes the noise performance of various modulation schemes. It begins by introducing a receiver model and defining figures of merit used to evaluate performance. It then analyzes the noise performance of coherent demodulation for DSB-SC and SSB modulation. The following key points are made:
1) Coherent detection of DSB-SC signals results in signal and noise being additive at both the input and output of the detector. The detector completely rejects the quadrature noise component.
2) For DSB-SC, the output SNR and reference SNR are equal, resulting in a figure of merit of 1.
3) Analysis of SSB modulation shows it achieves a 3 dB improvement in output SNR over
Electron-phonon coupling describes the interaction between electrons and phonons in materials. It can be calculated using density functional perturbation theory to obtain the electron-phonon matrix elements and phonon frequencies. This allows calculating temperature-dependent corrections to electronic band structures and optical properties within many-body perturbation theory. Yambo software implements these methods, calculating temperature renormalization of quasi-particle energies and broadening, as well as finite-temperature excitons and dielectric functions.
A C OMPARATIVE A NALYSIS A ND A PPLICATIONS O F M ULTI W AVELET T RANS...IJCI JOURNAL
In the era of telemedicine a large amount of medica
l information is exchanged via electronic media mos
tly
in the form of medical images, to improve the accur
acy and speed of diagnosis process. Medical Image
denoising has the basic importance in image analysi
s as these algorithm and procedures affects the eff
icacy
of medical diagnostic. In this paper focus is on Mu
lti wavelets based Image denoising techniques, beca
use
they provide the possibility of designing wavelets
systems which are orthogonal, symmetric and compact
ly
supported, simultaneously. Performance of Discrete
Multi Wavelet Transform and Discrete Wavelet
Transform based denoising methods are compared on t
he basis of PSNR
This document introduces the concept of random processes and provides examples to illustrate them. It defines a random process as a probability system composed of a sample space, an ensemble of time functions, and a probability measure. Random processes extend the concept of a random variable to incorporate the time parameter. Examples given include coin tossing, throwing a die, and thermal noise voltages across resistors. A random process is said to be stationary if its joint probability distribution is invariant to time shifts. Stationary processes have the property that the probability of waveforms passing through time-shifted windows remains the same. An example of a non-stationary process is also provided.
In this research paper, specific reaction rates of first order, second order; third order and m th order reactions are represented in terms of factorial function. These results would be further applied to obtain half life period as a particular case in application section.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
This document provides an overview of local mode analysis. It discusses how normal vibrational modes are delocalized and how local modes can be derived to describe individual bond vibrations. The document outlines Konkoli-Cremer local vibrational modes and describes how normal mode frequencies, force constants, and local mode frequencies are related. It also explains how to run the local mode program, generate bar diagrams and adiabatic connection schemes to analyze the relationship between normal and local modes.
The document describes a study that uses fuzzy logic to predict porosity from well log data. It discusses (1) normalizing the input data, (2) using subtractive clustering to identify clusters and membership functions, and (3) developing fuzzy rules with Gaussian membership functions to relate inputs like density, sonic, and neutron logs to the output of porosity. The results showed fuzzy logic predictions of porosity were more accurate than those from multiple linear regression on the same well log data.
Schedulability Analysis for a Combination of Non-Preemptive Strict Periodic T...IOSR Journals
This document discusses schedulability analysis for a combination of non-preemptive strict periodic tasks and preemptive sporadic tasks under fixed priority scheduling. It first reviews related work and defines the task models. It then presents a necessary and sufficient schedulability condition for non-preemptive strict periodic tasks and characterizes the transient and permanent phases of their schedule. Finally, it shows that the worst-case release times for sporadic tasks, from which their worst-case response times can be computed, occur only during the permanent phase of the strict periodic tasks.
This thesis examines the return interval distribution of extreme events in long memory time series that have two different scaling exponents. It first reviews long memory processes and their characterization using fractional autoregressive integrated moving average (ARFIMA) models. It then derives an analytical expression for the return interval distribution when the time series has two scaling exponents, as supported by numerical simulations. The thesis also considers a long memory probability process with two exponents and compares the return interval distribution to analytical results.
A COMPARISON OF PARTICLE SWARM OPTIMIZATION AND DIFFERENTIAL EVOLUTIONijsc
Two modern optimization methods including Particle Swarm Optimization and Differential Evolution are
compared on twelve constrained nonlinear test functions. Generally, the results show that Differential
Evolution is better than Particle Swarm Optimization in terms of high-quality solutions, running time and
robustness.
USING LEARNING AUTOMATA AND GENETIC ALGORITHMS TO IMPROVE THE QUALITY OF SERV...IJCSEA Journal
A hybrid learning automata–genetic algorithm (HLGA) is proposed to solve QoS routing optimization problem of next generation networks. The algorithm complements the advantages of the learning Automato Algorithm(LA) and Genetic Algorithm(GA). It firstly uses the good global search capability of LA to generate initial population needed by GA, then it uses GA to improve the Quality of Service(QoS) and acquiring the optimization tree through new algorithms for crossover and mutation operators which are an NP–Complete problem. In the proposed algorithm, the connectivity matrix of edges is used for genotype representation. Some novel heuristics are also proposed for mutation, crossover, and creation of random individuals. We evaluate the performance and efficiency of the proposed HLGA-based algorithm in comparison with other existing heuristic and GA-based algorithms by the result of simulation. Simulation results demonstrate that this paper proposed algorithm not only has the fast calculating speed and high accuracy but also can improve the efficiency in Next Generation Networks QoS routing. The proposed algorithm has overcome all of the previous algorithms in the literature..
This document presents a comparative study of monotonic and non-monotonic phase linear time-invariant (LTI) systems using an improved analytical PID controller design. It discusses using gain crossover frequency and phase margin specifications to design controllers that ensure minimum phase margin inside the desired bandwidth. For the comparative study, it uses bode stability criterion, Nyquist stability criterion, and unit step response. It presents a case study comparing the design of controllers for a buck converter system, which exhibits a non-monotonic phase response, using both monotonic and non-monotonic design techniques. The results show that treating the non-monotonic system as monotonic leads to an overvalued proportional gain and undervalued derivative gain in the PID controller.
The document describes several alternative models for information retrieval, including fuzzy set models, extended Boolean models, generalized vector space models, latent semantic indexing models, neural network models, and Bayesian network models. It provides details on fuzzy set models that allow gradual membership in sets, extended Boolean models that combine Boolean queries with vector space characteristics, and Bayesian networks that use directed acyclic graphs and conditional probabilities.
The document provides an overview and history of the wavelet transform. It can be summarized as follows:
1. The wavelet transform was developed to address limitations of the Fourier transform and short-time Fourier transform in analyzing signals both in time and frequency. It uses wavelets of limited duration that can be scaled and translated.
2. The history of the wavelet transform began in 1909 with Haar wavelets. The concept of wavelets was then proposed in 1981 and the term was coined in 1984. Important developments included the construction of additional orthogonal wavelets in 1985, the proposal of the multiresolution concept in 1988, and the fast wavelet transform algorithm in 1989, enabling numerous applications.
3.
Wavelets are mathematical functions. The wavelet transform is a tool that cuts up data, functions or operators into different frequency components and then studies each component with a resolution matched to its scale. It is needed, because analyzing discontinuities and sharp spikes of the signal and applications as image compression, human vision, radar, and earthquake prediction. Wai Mar Lwin | Thinn Aung | Khaing Khaing Wai "Applications of Wavelet Transform" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27958.pdfPaper URL: https://www.ijtsrd.com/mathemetics/applied-mathematics/27958/applications-of-wavelet-transform/wai-mar-lwin
Packets Wavelets and Stockwell Transform Analysis of Femoral Doppler Ultrasou...IJECEIAES
Ultrasonic Doppler signals are widely used in the detection of cardiovascular pathologies or the evaluation of the degree of stenosis in the femoral arteries. The presence of stenosis can be indicated by disturbing the blood flow in the femoral arteries, causing spectral broadening of the Doppler signal. To analyze these types of signals and determine stenosis index, a number of time-frequency methods have been developed, such as the short-time Fourier transform, the continuous wavelets transform, the wavelet packet transform, and the S-transform
This document introduces the Continuous Crooklet Transform (CCrT) and Discrete Crooklet Transform (DCrT) as novel transforms that aim to overcome limitations of wavelet and curvelet transforms. The CCrT is defined as the convolution of an input signal with scaled and translated versions of a principal "crooklet" function. The DCrT decomposes a signal using a filter bank of low-pass and high-pass filters in a manner similar to curvelet transforms. The Crooklet Transform fits image properties better than wavelets and has less computational complexity than curvelets. Potential applications of the Crooklet Transform include image processing, feature extraction, image compression, and medical imaging.
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Time Domain Signal Analysis Using Modified Haar and Modified Daubechies Wavelet Transform
1. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 161
Time Domain Signal Analysis Using Modified Haar and
Modified Daubechies Wavelet Transform
Daljeet Kaur Khanduja dkdkhalsa@gmail.com
Professor, Department of Mathematics,
Sinhgad Academy of Engineering, Kondhwa,
Pune 48, India
M.Y.Gokhale
Professor and Head of Department of Mathematics,
Maharashtra Institute of Technology, Kothrud,
Pune 38, India
Abstract
In this paper, time signal analysis and synthesis based on modified Haar and
modified Daubechies wavelet transform is proposed. The optimal results for
both analysis and synthesis for time domain signals were obtained with the
use of the modified Haar and modified Daubechies wavelet transforms. This
paper evaluates the quality of filtering using the modified Haar and modified
Daubechies wavelet transform. Analysis and synthesis of the time signals is
performed for 10 samples and the signal to noise ratio (SNR) of around 25-40
dB is obtained for modified Haar and 24-32 dB for modified Daubechies
wavelet. We have observed that as compared to standard Haar and standard
Daubechies mother wavelet our proposed method gives better signal quality,
which is good for time varying signals.
Keywords: Modified haar, Modified daubechies, Analysis, Synthesis.
1. INTRODUCTION
Wavelet analysis is a mathematical technique used to represent data or functions. The
wavelets used in the analysis are functions that possess certain mathematical properties, and
break the data down into different scales or resolutions [1]. Wavelets are better able to
handle spikes and discontinuities than traditional Fourier analysis making them a perfect tool
to de-noise noisy data. Therefore, the wavelet transform is anticipated to provide economical
and informative mathematical representation of many objects of interest [2]. In this paper,
signal data refer to data with some type of time or spatial relationship. The majority of signal
data we encounter in practical situations are a combination of low and high frequency
components. The low frequency component is somewhat stationary over the length of the
signal data. Wavelet analysis employs two functions, often referred to as the father and
mother wavelets, to generate a family of functions that break up and reconstruct a signal. The
father wavelet is similar in concept to a moving average function, while the mother wavelet
quantifies the differences between the original signal and the average generated by the father
wavelet. The combination of the two functions allows wavelet analysis to analyze both the low
and high frequency components in a signal simultaneously.
The wavelet transform is an emerging signal processing technique that can be used to
represent real-life nonstationary signals with high efficiency [3]. Indeed, the wavelet transform
2. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 162
is gaining momentum to become an alternative tool to traditional time-frequency
representation techniques such as the discrete Fourier transform and the discrete cosine
transform. By virtue of its multi-resolution representation capability, the wavelet transform has
been used effectively in vital applications such as transient signal analysis [4], numerical
analysis [5], computer vision [6], and image compression [7], among many other audiovisual
applications. Wavelets (literally “small waves”) are a relatively recent instrument in modern
mathematics. Introduced about 20 years ago, wavelets have made a revolution in theory and
practice of non-stationary signal analysis [8][9]. Wavelets have been first found in the
literature in works of Grossmann and Morlet [10].Some ideas of wavelets partly existed long
time ago. In 1910 Haar published a work about a system of locally-defined basis functions.
Now these functions are called Haar wavelets. Nowadays wavelets are widely used in
various signal analysis, ranging from image processing, analysis and synthesis of speech,
medical data and music [11][12].
In this paper we use modified Haar and modified Daubechies wavelet by considering odd
number of coefficients and implement it in time signal analysis and synthesis. The two sets of
coefficients (low pass and high pass filter coefficients) obtained that define the refinement
relation act as signal filters. A set of simultaneous equations are formulated and solved to
obtain numerical values for the coefficients. The quality of filtering using the modified Haar
and modified Daubechies wavelet transform is evaluated by calculating the SNR for 10
samples.
The organization of this paper is as follows: In section 2, the standard Haar and Daubechies
mother wavelets is discussed. Section 3 explains the mathematical analysis, in section 4
results for modified Haar and modified Daubechies mother wavelets are presented. In
Section 5 the results are discussed, Section 6 gives the observations and in Section 7
conclusions of this work are summarized.
2 STANDARD HAAR AND STANDARD DAUBECHIES WAVELETS
The key idea to find the wavelets is self-similarity. We start with a function t that is made
up of a smaller version of itself. This is the refinement (or 2-scale, dilation) equation given by
ktcktkht
N
k
k
N
k
222
1
0
1
0
(1)
where 2khck . We call kc as un-normalized coefficients and kh as the normalized
coefficients.
ktcktkt
N
k
k
N
k
2'22g
1
0
1
0
(2)
where
2' kgck
First, the scaling function is chosen to preserve its area under each iteration,
so 1
dtt . (3)
The scaling relation then imposes a condition on the filter coefficients.
3. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 163
dtktcdtt
N
k
k
1
0
2
= dtktc
N
k
k 2
1
0
= dyyck
2
1
Since dyydtt , we obtain
2
1
0
N
k
kc (4)
Utilizing the relation 2khck , we get the relation in terms of normalized coefficient as:
2
2
21
0
N
k
kh . (5)
Therefore for Haar scaling function
210 hh , (6)
010 hh (7)
Solving we get
2
1
10 hh
Secondly, if N=4, the equations for the filter coefficients are
23210 hhhh (8)
03210 hhhh (9)
03120 hhhh (10)
The solutions are
4
31
3,
4
33
2,
4
33
1,
4
31
0
hhhh
The corresponding wavelet is Daubechies-2( ndb ) wavelet that is supported on
intervals 3,0 . This construction is known as Daubechies wavelet construction. In general,
ndb represents the family of Daubechies Wavelets and n is the order. The family includes
Haar wavelet since Haar wavelet represents the same wavelet as db1.
3 IMPLEMENTATION
3.1 MATHEMATICAL ANALYSIS
Consider Haar scaling function t defined in equation (11) and shown in figure (1)
4. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 164
whereelse
tt
0
101
(11)
t
1
0 1 t
FIGURE 1: Haar Scaling Function
Consider functions of the type 1,2,1 ttt or in general kt .These
functions are called as translates of t . In function t , the function exists practically for
values of t in the range 1,0 . Beyond this range, function value is zero.
t
1 2t kt
0 1 2 3 k 1k
t
FIGURE 2: Translations Of Haar Scaling Function t
The domain of the function is [0, 1].Note that the function is time limited and have finite
energy. That is dttf
2
exists and is finite.
Consider a set of orthonormal functions ....1,,1...... ttt , which are translates of
a single function t .
Let 0V be the space spanned by the set of bases ....1,,1...... ttt .We denote
this as
5. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 165
ktSpanV 0 (12)
Consider a function ktatf
k
k
where sak ' are real numbers (scalars) which we
call as coefficients of skt ' . For one set of sak ' , we have one particular signal. But
assume that we are continuously changing sak ' to generate continuously new functions or
signals. The set of all such signals constitute the function space 0V .
3.2 FINER HAAR SCALING FUNCTIONS
Let us now scale the Haar basis function and form a new basis set. We scale t by 2 and
form functions of the type 22,12,2,12 tttt or in general kt 2 . These
functions are again overlapping and are, therefore orthogonal among them.
We call the space spanned by this set of function Nkkt ,2 as 1V . Figure (3) shows
the new set of bases. Formally,
k
ktSpanV 21
(13)
1 t2 12 t 22 t 32 t
0 0.5 1 1.5 2 1V
FIGURE 3: Haar Scaling Functions Which Form the Basis For 1V
Any signal in such space can be written as:
ktatf
k
k
21 (14)
By varying sak ' in equation (14), we can generate new functions and set of all such possible
functions constitute the space 1V . A signal in such a space is illustrated in figure (4)
6. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 166
tf
1
t2 12 t 22 t 32 t
0 0.5 1 1.5 2
t
FIGURE 4: A Signal Which Is Element of Space 1V
Similarly 2V is the space spanned by kt 2
2 , that is,
k
ktSpanV 22
2
Generalizing jV is the space spanned by ktj
2 .
k
ktSpanV j
j 2
(15)
4 MODIFIED MOTHER WAVELETS
4.1 MODIFIED HAAR WAVELET TRANSFORM
We now illustrate how to generate modified Haar and Daubechies wavelets. First, consider
the above constraints on the ka for N=3.
The stability condition enforces 414.1210 hhh (16)
the accuracy condition implies 0321 hhh . (17)
Solving these equations the different sets of infinitely many solutions (lowpass and high pass
filter coefficients) obtained for Modified Haar is
Set 1 353.0,707.0,354.0g353.0,707.0,354.0 kandkh
Set2 507.0,707.0,200.0g507.0,707.0,200.0 kandkh .
Set 3 315.0,707.0,392.0g315.0,707.0,392.0 kandkh .
4.2 MODIFIED DAUBECHIES (db2) WAVELET TRANSFORM
Consider the above constraints on the ka for N=5, the equations for the filter coefficients are
7. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 167
414.143210 hhhhh (18)
043210 hhhhh (19)
Solving these equations, the different sets of infinitely many solutions (lowpass and high pass
filter coefficients) obtained for modified Daubechies are
Set1
30.0,415.0,25.0,292.0,157.030.0,415.0,25.0,292.0,157.0 kgandkh
Set2
275.0,353.0,215.0,354.0,217.0275.0,353.0,215.0,354.0,217.0 kgandkh
Set3
275.0,415.0,215.0,292.0,217.0275.0,415.0,215.0,292.0,217.0 kgandkh
Set4
242.0,353.0,235.0,354.0,23.0242.0,353.0,235.0,354.0,23.0 kgandkh
5 RESULTS
TABLE 1: Modified Haar Wavelet Transform
Sample SNR using
Haar
SNR using
modified
Haar Set
SNR using
modified
Haar Set 2
SNR using
modified Haar
Set 3
T1 22.52 37.16 26.66 35.01
T2 22.04 37.07 26.38 34.84
T3 20.99 31.92 24.97 30.96
T4 23.24 37.56 27.39 35.55
T5 21.85 37.43 26.01 34.86
T6 22.63 37.56 26.80 35.29
T7 22.52 35.60 26.59 34.03
T8 21.30 33.21 25.67 32.10
T9 21.30 33.21 25.67 32.10
T10 21.58 35.24 26.20 33.66
8. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 168
0
10
20
30
40
50
T1 T2 T3 T4 T5 T6 T7 T8 T9 T10
SNR
Samples
SNR
using
Haar
SNR
using
modified
Haar
SNR
using
modified
Haar
FIGURE 5: Graphical Presentation for Snr Calculation Using Modified Haar Wavelet
TABLE 2: Modified Daubechies Wavelet Transform
Sample SNR using
Standarddb2
SNR using
modified
db2 Set 1
SNR using
modified
db2 Set 2
SNR using
modified
db2 Set 3
SNR using
modified
db2 Set 4
T1 18.01 25.42 28.77 27.84 29.88
T2 17.71 25.19 28.68 27.70 29.85
T3 16.81 22.88 24.56 24.08 25.11
T4 18.74 26.05 29.17 28.30 30.19
T5 17.30 24.87 28.55 27.51 29.83
T6 18.12 25.63 29.15 28.17 30.33
T7 18.09 25.16 27.99 27.21 28.86
T8 17.38 24.08 26.32 25.71 27.01
T9 18.53 26.44 30.85 29.56 32.50
T10 17.60 24.77 27.62 26.84 28.50
9. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 169
0
5
10
15
20
25
30
35
T1 T2 T3 T4 T5 T6 T7 T8 T9 T10
SNR
Samples
SNR
using
db2
SNR
using
modified
db2
SNR
using
modified
db2
FIGURE 6: Graphical Presentation for SNR Calculation Using Modified Db2 Wavelet
6. OBSERVATIONS
From table 1 we observe that the SNR is improved for Modified Haar as compared to
standard Haar wavelet. The SNR was calculated by considering different sets of values for
Modified Haar and we observe that Set 1 of Modified Haar gives better SNR values.
From table 2 we observe that the SNR is improved for Modified Daubechies (db2) as
compared to standard Daubechies (db2) wavelet. The SNR was calculated by considering
different sets of values for Modified Daubechies (db2) and we observe that Set 4 of Modified
Daubechies (db2) gives better SNR values.
Following example shows how the analysis and synthesis is carried out using modified haar
and modified Daubechies wavelet transform.
FIGURE 7: Input Sample: T6.Wav for Modified Haar Wavelet
10. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 170
11. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 171
MODIFIED HAAR MOTHER WAVELET ANALYSIS AND SYNTHESIS
WAVELET FILTERING
FIGURE 8: Input Sample: T6.Wav for Modified Daubechies (Db2) Mother Wavelet
12. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 172
MODIFIED DAUBECHIES (db2) MOTHER WAVELET ANALYSIS AND SYNTHESIS
13. Daljeet Kaur Khanduja & M.Y.Gokhale
Signal Processing-An International Journal (SPIJ), Volume (4): Issue (3) 173
WAVELET FILTERING
7. CONCLUSION
We have presented a method for analysis and synthesis of time signals using modified Haar
and modified Daubechies wavelet filtering techniques by considering odd number of
coefficients and implement it in time signal analysis and synthesis. The two sets of
coefficients (low pass and high pass filter coefficients) obtained that define the refinement
relation act as signal filters. Analysis and synthesis of time signals is performed for 10
samples and the signal to noise ratio (SNR) of around 25-40 dB is obtained for modified Haar
and 24-32 dB for modified Daubechies as compared to standard Haar and Daubechies
mother wavelet, which is good for time varying signals. Hence we conclude that as compared
to standard Haar and standard Daubechies mother wavelet our modified method gives better
signal quality, and that the system will behave stable with wavelet filter and can be used for
time signal analysis and synthesis purpose.
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