The document proposes a distributed algorithm for network size estimation. Each node in the network runs simple first-order dynamics that exchanges information only with neighbors. The dynamics are designed such that the individual solutions of all nodes will converge to the total number of nodes N in the network. The algorithm provides a deterministic estimate of N and does not require initialization, making it "plug-and-play ready" for dynamic networks where nodes can join or leave over time. It is proven that if the gain k is larger than N^3, the estimates will converge to the true value N within a finite settling time.
This document discusses greedy algorithms and provides examples of their use. It begins by defining characteristics of greedy algorithms, such as making locally optimal choices that reduce a problem into smaller subproblems. The document then covers designing greedy algorithms, proving their optimality, and analyzing examples like the fractional knapsack problem and minimum spanning tree algorithms. Specific greedy algorithms covered in more depth include Kruskal's and Prim's minimum spanning tree algorithms and Huffman coding.
5. convolution and correlation of discrete time signals MdFazleRabbi18
This document discusses convolution and correlation of discrete time signals. It defines convolution as a mathematical way of combining two signals to form a third signal, which is equivalent to finite impulse response filtering. Convolution relates the input, output, and impulse response of a linear time-invariant system. The document also provides examples of discrete linear convolution and periodic convolution. It then defines correlation as a measure of similarity between signals, discussing cross-correlation and auto-correlation, and providing examples of calculating each.
The document describes Muhammad Ahsan's Ph.D. defense which focused on developing an architecture framework and performance simulation tool for trapped ion quantum computers in order to estimate the reliability and resource requirements for large-scale quantum applications. The research involved defining quantum hardware and architecture models, benchmarking application circuits like Shor's algorithm, and using the simulation tool to evaluate performance metrics under different architecture parameters and device limitations.
The document discusses greedy algorithms and their applications. It provides examples of problems that greedy algorithms can solve optimally, such as the change making problem and finding minimum spanning trees (MSTs). It also discusses problems where greedy algorithms provide approximations rather than optimal solutions, such as the traveling salesman problem. The document describes Prim's and Kruskal's algorithms for finding MSTs and Dijkstra's algorithm for solving single-source shortest path problems. It explains how these algorithms make locally optimal choices at each step in a greedy manner to build up global solutions.
The document discusses various optimization problems that can be solved using the greedy method. It begins by explaining that the greedy method involves making locally optimal choices at each step that combine to produce a globally optimal solution. Several examples are then provided to illustrate problems that can and cannot be solved with the greedy method. These include shortest path problems, minimum spanning trees, activity-on-edge networks, and Huffman coding. Specific greedy algorithms like Kruskal's algorithm, Prim's algorithm, and Dijkstra's algorithm are also covered. The document concludes by noting that the greedy method can only be applied to solve a small number of optimization problems.
This lecture discusses linear time-invariant (LTI) systems and convolution. Any input signal can be represented as a sum of time-shifted impulse signals. The output of an LTI system is determined by its impulse response h[n] using convolution. Convolution involves multiplying and summing the input signal with time-shifted versions of the impulse response. This allows predicting a system's response to any input based only on its impulse response. Examples show calculating convolution by summing scaled signal segments and using the non-zero elements of h[n]. Exercises include reproducing an example convolution in MATLAB.
I am Stacy L. I am a Matlab Assignment Expert at matlabassignmentexperts.com. I hold a Master's in Matlab, University of Houston. I have been helping students with their homework for the past 9 years. I solve assignments related to Data Analysis.
Visit matlabassignmentexperts.com or email info@matlabassignmentexperts.com.
You can also call on +1 678 648 4277 for any assistance with Data Analysis Assignments.
This document discusses greedy algorithms and provides examples of their use. It begins by defining characteristics of greedy algorithms, such as making locally optimal choices that reduce a problem into smaller subproblems. The document then covers designing greedy algorithms, proving their optimality, and analyzing examples like the fractional knapsack problem and minimum spanning tree algorithms. Specific greedy algorithms covered in more depth include Kruskal's and Prim's minimum spanning tree algorithms and Huffman coding.
5. convolution and correlation of discrete time signals MdFazleRabbi18
This document discusses convolution and correlation of discrete time signals. It defines convolution as a mathematical way of combining two signals to form a third signal, which is equivalent to finite impulse response filtering. Convolution relates the input, output, and impulse response of a linear time-invariant system. The document also provides examples of discrete linear convolution and periodic convolution. It then defines correlation as a measure of similarity between signals, discussing cross-correlation and auto-correlation, and providing examples of calculating each.
The document describes Muhammad Ahsan's Ph.D. defense which focused on developing an architecture framework and performance simulation tool for trapped ion quantum computers in order to estimate the reliability and resource requirements for large-scale quantum applications. The research involved defining quantum hardware and architecture models, benchmarking application circuits like Shor's algorithm, and using the simulation tool to evaluate performance metrics under different architecture parameters and device limitations.
The document discusses greedy algorithms and their applications. It provides examples of problems that greedy algorithms can solve optimally, such as the change making problem and finding minimum spanning trees (MSTs). It also discusses problems where greedy algorithms provide approximations rather than optimal solutions, such as the traveling salesman problem. The document describes Prim's and Kruskal's algorithms for finding MSTs and Dijkstra's algorithm for solving single-source shortest path problems. It explains how these algorithms make locally optimal choices at each step in a greedy manner to build up global solutions.
The document discusses various optimization problems that can be solved using the greedy method. It begins by explaining that the greedy method involves making locally optimal choices at each step that combine to produce a globally optimal solution. Several examples are then provided to illustrate problems that can and cannot be solved with the greedy method. These include shortest path problems, minimum spanning trees, activity-on-edge networks, and Huffman coding. Specific greedy algorithms like Kruskal's algorithm, Prim's algorithm, and Dijkstra's algorithm are also covered. The document concludes by noting that the greedy method can only be applied to solve a small number of optimization problems.
This lecture discusses linear time-invariant (LTI) systems and convolution. Any input signal can be represented as a sum of time-shifted impulse signals. The output of an LTI system is determined by its impulse response h[n] using convolution. Convolution involves multiplying and summing the input signal with time-shifted versions of the impulse response. This allows predicting a system's response to any input based only on its impulse response. Examples show calculating convolution by summing scaled signal segments and using the non-zero elements of h[n]. Exercises include reproducing an example convolution in MATLAB.
I am Stacy L. I am a Matlab Assignment Expert at matlabassignmentexperts.com. I hold a Master's in Matlab, University of Houston. I have been helping students with their homework for the past 9 years. I solve assignments related to Data Analysis.
Visit matlabassignmentexperts.com or email info@matlabassignmentexperts.com.
You can also call on +1 678 648 4277 for any assistance with Data Analysis Assignments.
The document discusses the Radix-2 discrete Fourier transform (DFT) algorithm. It explains that the Radix-2 DFT divides an N-point sequence into two N/2-point sequences, computes the DFT of each subsequence, and then combines the results to compute the N-point DFT. It involves decimating the sequence, computing smaller DFTs, and combining results over multiple stages. The Radix-2 algorithm reduces the computation from O(N^2) for the direct DFT to O(NlogN) operations.
Quantum mechanics and the square root of the Brownian motionMarco Frasca
The document discusses taking the square root of Brownian motion and how it relates to quantum mechanics. It shows that defining the square root through stochastic integration reproduces the heat kernel and Schrodinger's equation. This indicates the process is doing quantum mechanics. The approach is generalized to include potentials, deriving the harmonic oscillator case. Finally, using Dirac's algebra trick and introducing additional Brownian motions, the formalism reproduces the Dirac equation and introduces spin naturally through stochastic behavior.
The document summarizes key concepts about linear time-invariant (LTI) systems from Chapter 2. It discusses:
1) LTI systems can be modeled as the sum of their impulse responses weighted by the input signal. This is known as the convolution sum/integral for discrete/continuous-time systems.
2) Any signal can be represented as a linear combination of shifted unit impulses. The output of an LTI system is the convolution of the input signal with the system's impulse response.
3) The impulse response completely characterizes an LTI system. The output is found by taking the convolution integral or sum of the input signal with the impulse response.
The document discusses linear time-invariant (LTI) systems. It explains that:
1) The response of an LTI system to any input can be found by convolving the system's impulse response with the input. This is done using a convolution sum in discrete time and a convolution integral in continuous time.
2) Discrete-time signals and continuous-time signals can both be represented as weighted sums or integrals of shifted impulse functions.
3) For LTI systems, the impulse responses are simply time-shifted versions of the same underlying function, allowing the system to be fully characterized by its impulse response.
Convolution discrete and continuous time-difference equaion and system proper...Vinod Sharma
This document discusses discrete time signals and discrete time convolution. Discrete time convolution describes the output of a linear, time-invariant system when its input is one discrete signal and its impulse response is another. The output is the sum of each input sample multiplied by the corresponding flipped and shifted impulse response. This allows characterization of a system by its impulse response. The document provides examples of discrete time convolution and discusses properties such as the number of samples in the convolved output depending on the lengths of the input and impulse response signals.
Animashree Anandkumar, Electrical Engineering and CS Dept, UC Irvine at MLcon...MLconf
Anima Anandkumar is a faculty at the EECS Dept. at U.C.Irvine since August 2010. Her research interests are in the area of large-scale machine learning and high-dimensional statistics. She received her B.Tech in Electrical Engineering from IIT Madras in 2004 and her PhD from Cornell University in 2009. She has been a visiting faculty at Microsoft Research New England in 2012 and a postdoctoral researcher at the Stochastic Systems Group at MIT between 2009-2010. She is the recipient of the Microsoft Faculty Fellowship, ARO Young Investigator Award, NSF CAREER Award, and IBM Fran Allen PhD fellowship.
This document provides an introduction to deep neural networks (DNNs) by a Dr. Liwei Ren. It defines DNNs from both technical and mathematical perspectives. DNNs are composed of three main elements - architecture, activity rule, and learning rule. The architecture determines the network's capability and is typically a directed graph with weights, biases, and activation functions. Gradient descent and backpropagation are commonly used as the learning rule to update weights and minimize error. Universal approximation theorems show that both shallow and deep neural networks can approximate functions, with deep networks potentially being more efficient. Examples of DNN applications include image recognition. Security issues are also briefly mentioned.
Implicit schemes are needed in order to have fast runtime in wave models. Parallelization using the Message Passing Interface are needed in order to run on computers with thousands of processors. Implicit schemes rely on preconditioner in order for the iterative schemes to converge fast. Thus we need fast preconditioners and we present those here.
This document contains the homework assignment for EE 221. It includes two main questions:
1) Determine if given signals are periodic and find their fundamental periods.
2) Analyze various properties of signals, including whether they are periodic, power signals, or energy signals. Calculate their average power and energy where applicable.
The solutions provide detailed working showing the periodicity analysis and calculations for average power and energy for each sub-part of the two questions. Periodic signals are identified and their fundamental periods calculated. Non-periodic, power and energy signals are also identified.
The document discusses various algorithms that can be solved using backtracking. It begins by defining backtracking as a general algorithm design technique for problems that involve searching for solutions satisfying constraints. It then provides examples of problems that can be solved using backtracking, including the 8 queens problem, sum of subsets, graph coloring, and finding Hamiltonian cycles in a graph. For each problem, it outlines the key steps and provides pseudocode for the backtracking algorithm.
Digit recognizer by convolutional neural networkDing Li
A convolutional neural network is used to recognize handwritten digits from images. The CNN uses convolutional and max pooling layers to extract local features from the images. These local features are then fed into fully connected layers to combine them into global features used to predict the digit (0-9) in each image with a softmax output layer. The model is trained on 60,000 images and achieves 99.67% accuracy on the test set after 30 training epochs. While powerful, it is unclear if humans can fully understand the "mind" and logic of artificial neural networks.
This document discusses the decimation-in-time (DIT) algorithm for computing the discrete Fourier transform (DFT) in a more efficient manner than directly calculating all N points. DIT works by splitting the input sequence into smaller sequences, computing smaller DFTs, and recombining the results. Specifically, it separates the input into even and odd samples, computes partial DFTs on each, and combines them using a "butterfly" structure. This structure implements each step of the algorithm with one multiplication, reducing the complexity from N^2 operations to N^2/2 + N operations. The document provides an example of an 8-point DFT computed using the DIT algorithm and butterfly structure.
The document discusses greedy algorithms and provides examples. It begins with an overview of greedy algorithms and their properties. It then provides a sample problem (traveling salesman) and shows how a greedy approach can provide an iterative solution. The document notes advantages and disadvantages of greedy algorithms and provides additional examples, including optimal binary tree merging and the knapsack problem. It concludes with describing algorithms for optimal solutions to these problems.
This document discusses linear time-invariant (LTI) systems in discrete time. It introduces the convolution sum representation of LTI systems, where the output of an LTI system with impulse response h[n] and input x[n] is given by y[n]=x[n]*h[n]=∑k x[k]h[n-k]. Several examples are worked through to demonstrate calculating the output of an LTI system given its impulse response and input. The document also discusses representing discrete time signals as the sum of shifted unit impulse functions and properties of LTI systems like time-invariance.
This document discusses clustering methods using the EM algorithm. It begins with an overview of machine learning and unsupervised learning. It then describes clustering, k-means clustering, and how k-means can be formulated as an optimization of a biconvex objective function solved via an iterative EM algorithm. The document goes on to describe mixture models and how the EM algorithm can be used to estimate the parameters of a Gaussian mixture model (GMM) via maximum likelihood.
Applied Digital Signal Processing 1st Edition Manolakis Solutions Manualtowojixi
Full download http://alibabadownload.com/product/applied-digital-signal-processing-1st-edition-manolakis-solutions-manual/
Applied Digital Signal Processing 1st Edition Manolakis Solutions Manual
I am Anthony F. I am a Digital Signal Processing Assignment Expert at matlabassignmentexperts.com. I hold a Ph.D. in Matlab, University of Cambridge, UK. I have been helping students with their homework for the past 8 years. I solve assignments related to Digital Signal Processing.
Visit matlabassignmentexperts.com or email info@matlabassignmentexperts.com.
You can also call on +1 678 648 4277 for any assistance with Digital Signal Processing Assignments.
This document provides an overview of signals and systems. It defines signals as functions that carry information over time or discrete steps. There are two main types of signals: continuous-time signals defined over continuous variables like time, and discrete-time signals defined over discrete variables like time steps. Signals can be periodic if they repeat, or non-periodic. Any signal can be decomposed into even and odd components. The document also introduces the concepts of deterministic signals where values are fixed, versus random signals with uncertainty.
Continuum Modeling and Control of Large Nonuniform NetworksYang Zhang
Presented at The 49th Annual Allerton Conference on Communication, Control, and Computing, 2011
Abstract—Recent research has shown that some Markov chains modeling networks converge to continuum limits, which are solutions of partial differential equations (PDEs), as the number of the network nodes approaches infinity. Hence we can approximate such large networks by PDEs. However, the previous results were limited to uniform immobile networks with a fixed transmission rule. In this paper we first extend the analysis to uniform networks with more general transmission rules. Then through location transformations we derive the continuum limits of nonuniform and possibly mobile networks. Finally, by comparing the continuum limits of corresponding nonuniform and uniform networks, we develop a method to control the transmissions in nonuniform and mobile networks so that the continuum limit is invariant under node locations, and hence mobility. This enables nonuniform and mobile networks to maintain stable global characteristics in the presence of varying node locations.
This document summarizes the finite difference method for numerically solving heat transfer problems. The method involves establishing a nodal network to discretize the domain, deriving finite difference approximations of the governing heat equation at each node, developing a system of simultaneous algebraic equations relating all nodal temperatures, and solving the system of equations using numerical techniques like matrix inversion or iterative methods. Examples are provided to illustrate the finite difference approximations, formation of the algebraic system, and solution via the Jacobi and Gauss-Seidel iteration methods.
The document discusses the Radix-2 discrete Fourier transform (DFT) algorithm. It explains that the Radix-2 DFT divides an N-point sequence into two N/2-point sequences, computes the DFT of each subsequence, and then combines the results to compute the N-point DFT. It involves decimating the sequence, computing smaller DFTs, and combining results over multiple stages. The Radix-2 algorithm reduces the computation from O(N^2) for the direct DFT to O(NlogN) operations.
Quantum mechanics and the square root of the Brownian motionMarco Frasca
The document discusses taking the square root of Brownian motion and how it relates to quantum mechanics. It shows that defining the square root through stochastic integration reproduces the heat kernel and Schrodinger's equation. This indicates the process is doing quantum mechanics. The approach is generalized to include potentials, deriving the harmonic oscillator case. Finally, using Dirac's algebra trick and introducing additional Brownian motions, the formalism reproduces the Dirac equation and introduces spin naturally through stochastic behavior.
The document summarizes key concepts about linear time-invariant (LTI) systems from Chapter 2. It discusses:
1) LTI systems can be modeled as the sum of their impulse responses weighted by the input signal. This is known as the convolution sum/integral for discrete/continuous-time systems.
2) Any signal can be represented as a linear combination of shifted unit impulses. The output of an LTI system is the convolution of the input signal with the system's impulse response.
3) The impulse response completely characterizes an LTI system. The output is found by taking the convolution integral or sum of the input signal with the impulse response.
The document discusses linear time-invariant (LTI) systems. It explains that:
1) The response of an LTI system to any input can be found by convolving the system's impulse response with the input. This is done using a convolution sum in discrete time and a convolution integral in continuous time.
2) Discrete-time signals and continuous-time signals can both be represented as weighted sums or integrals of shifted impulse functions.
3) For LTI systems, the impulse responses are simply time-shifted versions of the same underlying function, allowing the system to be fully characterized by its impulse response.
Convolution discrete and continuous time-difference equaion and system proper...Vinod Sharma
This document discusses discrete time signals and discrete time convolution. Discrete time convolution describes the output of a linear, time-invariant system when its input is one discrete signal and its impulse response is another. The output is the sum of each input sample multiplied by the corresponding flipped and shifted impulse response. This allows characterization of a system by its impulse response. The document provides examples of discrete time convolution and discusses properties such as the number of samples in the convolved output depending on the lengths of the input and impulse response signals.
Animashree Anandkumar, Electrical Engineering and CS Dept, UC Irvine at MLcon...MLconf
Anima Anandkumar is a faculty at the EECS Dept. at U.C.Irvine since August 2010. Her research interests are in the area of large-scale machine learning and high-dimensional statistics. She received her B.Tech in Electrical Engineering from IIT Madras in 2004 and her PhD from Cornell University in 2009. She has been a visiting faculty at Microsoft Research New England in 2012 and a postdoctoral researcher at the Stochastic Systems Group at MIT between 2009-2010. She is the recipient of the Microsoft Faculty Fellowship, ARO Young Investigator Award, NSF CAREER Award, and IBM Fran Allen PhD fellowship.
This document provides an introduction to deep neural networks (DNNs) by a Dr. Liwei Ren. It defines DNNs from both technical and mathematical perspectives. DNNs are composed of three main elements - architecture, activity rule, and learning rule. The architecture determines the network's capability and is typically a directed graph with weights, biases, and activation functions. Gradient descent and backpropagation are commonly used as the learning rule to update weights and minimize error. Universal approximation theorems show that both shallow and deep neural networks can approximate functions, with deep networks potentially being more efficient. Examples of DNN applications include image recognition. Security issues are also briefly mentioned.
Implicit schemes are needed in order to have fast runtime in wave models. Parallelization using the Message Passing Interface are needed in order to run on computers with thousands of processors. Implicit schemes rely on preconditioner in order for the iterative schemes to converge fast. Thus we need fast preconditioners and we present those here.
This document contains the homework assignment for EE 221. It includes two main questions:
1) Determine if given signals are periodic and find their fundamental periods.
2) Analyze various properties of signals, including whether they are periodic, power signals, or energy signals. Calculate their average power and energy where applicable.
The solutions provide detailed working showing the periodicity analysis and calculations for average power and energy for each sub-part of the two questions. Periodic signals are identified and their fundamental periods calculated. Non-periodic, power and energy signals are also identified.
The document discusses various algorithms that can be solved using backtracking. It begins by defining backtracking as a general algorithm design technique for problems that involve searching for solutions satisfying constraints. It then provides examples of problems that can be solved using backtracking, including the 8 queens problem, sum of subsets, graph coloring, and finding Hamiltonian cycles in a graph. For each problem, it outlines the key steps and provides pseudocode for the backtracking algorithm.
Digit recognizer by convolutional neural networkDing Li
A convolutional neural network is used to recognize handwritten digits from images. The CNN uses convolutional and max pooling layers to extract local features from the images. These local features are then fed into fully connected layers to combine them into global features used to predict the digit (0-9) in each image with a softmax output layer. The model is trained on 60,000 images and achieves 99.67% accuracy on the test set after 30 training epochs. While powerful, it is unclear if humans can fully understand the "mind" and logic of artificial neural networks.
This document discusses the decimation-in-time (DIT) algorithm for computing the discrete Fourier transform (DFT) in a more efficient manner than directly calculating all N points. DIT works by splitting the input sequence into smaller sequences, computing smaller DFTs, and recombining the results. Specifically, it separates the input into even and odd samples, computes partial DFTs on each, and combines them using a "butterfly" structure. This structure implements each step of the algorithm with one multiplication, reducing the complexity from N^2 operations to N^2/2 + N operations. The document provides an example of an 8-point DFT computed using the DIT algorithm and butterfly structure.
The document discusses greedy algorithms and provides examples. It begins with an overview of greedy algorithms and their properties. It then provides a sample problem (traveling salesman) and shows how a greedy approach can provide an iterative solution. The document notes advantages and disadvantages of greedy algorithms and provides additional examples, including optimal binary tree merging and the knapsack problem. It concludes with describing algorithms for optimal solutions to these problems.
This document discusses linear time-invariant (LTI) systems in discrete time. It introduces the convolution sum representation of LTI systems, where the output of an LTI system with impulse response h[n] and input x[n] is given by y[n]=x[n]*h[n]=∑k x[k]h[n-k]. Several examples are worked through to demonstrate calculating the output of an LTI system given its impulse response and input. The document also discusses representing discrete time signals as the sum of shifted unit impulse functions and properties of LTI systems like time-invariance.
This document discusses clustering methods using the EM algorithm. It begins with an overview of machine learning and unsupervised learning. It then describes clustering, k-means clustering, and how k-means can be formulated as an optimization of a biconvex objective function solved via an iterative EM algorithm. The document goes on to describe mixture models and how the EM algorithm can be used to estimate the parameters of a Gaussian mixture model (GMM) via maximum likelihood.
Applied Digital Signal Processing 1st Edition Manolakis Solutions Manualtowojixi
Full download http://alibabadownload.com/product/applied-digital-signal-processing-1st-edition-manolakis-solutions-manual/
Applied Digital Signal Processing 1st Edition Manolakis Solutions Manual
I am Anthony F. I am a Digital Signal Processing Assignment Expert at matlabassignmentexperts.com. I hold a Ph.D. in Matlab, University of Cambridge, UK. I have been helping students with their homework for the past 8 years. I solve assignments related to Digital Signal Processing.
Visit matlabassignmentexperts.com or email info@matlabassignmentexperts.com.
You can also call on +1 678 648 4277 for any assistance with Digital Signal Processing Assignments.
This document provides an overview of signals and systems. It defines signals as functions that carry information over time or discrete steps. There are two main types of signals: continuous-time signals defined over continuous variables like time, and discrete-time signals defined over discrete variables like time steps. Signals can be periodic if they repeat, or non-periodic. Any signal can be decomposed into even and odd components. The document also introduces the concepts of deterministic signals where values are fixed, versus random signals with uncertainty.
Continuum Modeling and Control of Large Nonuniform NetworksYang Zhang
Presented at The 49th Annual Allerton Conference on Communication, Control, and Computing, 2011
Abstract—Recent research has shown that some Markov chains modeling networks converge to continuum limits, which are solutions of partial differential equations (PDEs), as the number of the network nodes approaches infinity. Hence we can approximate such large networks by PDEs. However, the previous results were limited to uniform immobile networks with a fixed transmission rule. In this paper we first extend the analysis to uniform networks with more general transmission rules. Then through location transformations we derive the continuum limits of nonuniform and possibly mobile networks. Finally, by comparing the continuum limits of corresponding nonuniform and uniform networks, we develop a method to control the transmissions in nonuniform and mobile networks so that the continuum limit is invariant under node locations, and hence mobility. This enables nonuniform and mobile networks to maintain stable global characteristics in the presence of varying node locations.
This document summarizes the finite difference method for numerically solving heat transfer problems. The method involves establishing a nodal network to discretize the domain, deriving finite difference approximations of the governing heat equation at each node, developing a system of simultaneous algebraic equations relating all nodal temperatures, and solving the system of equations using numerical techniques like matrix inversion or iterative methods. Examples are provided to illustrate the finite difference approximations, formation of the algebraic system, and solution via the Jacobi and Gauss-Seidel iteration methods.
Digital Signal Processing[ECEG-3171]-Ch1_L03Rediet Moges
This Digital Signal Processing Lecture material is the property of the author (Rediet M.) . It is not for publication,nor is it to be sold or reproduced.
#Africa#Ethiopia
Sequential quasi-Monte Carlo (SQMC) is a quasi-Monte Carlo (QMC) version of sequential Monte Carlo (or particle filtering), a popular class of Monte Carlo techniques used to carry out inference in state space models. In this talk I will first review the SQMC methodology as well as some theoretical results. Although SQMC converges faster than the usual Monte Carlo error rate its performance deteriorates quickly as the dimension of the hidden variable increases. However, I will show with an example that SQMC may perform well for some "high" dimensional problems. I will conclude this talk with some open problems and potential applications of SQMC in complicated settings.
This document discusses fast algorithms for computing the discrete cosine transform (DCT) and inverse discrete cosine transform (IDCT) using Winograd's method.
The conventional DCT and IDCT algorithms have high computational complexity due to cosine functions. Winograd's algorithm reduces the number of multiplications required for matrix multiplication by rearranging terms.
The document proposes applying Winograd's algorithm to DCT and IDCT computation by representing the transforms as matrix multiplications. This approach reduces the number of multiplications required for an 8x8 block from over 16,000 to just 736 multiplications, with fewer additions and subtractions as well. This leads to faster DCT and IDCT computation compared
MVPA with SpaceNet: sparse structured priorsElvis DOHMATOB
The GraphNet (aka S-Lasso), as well as other “sparsity + structure” priors like TV (Total-Variation), TV-L1, etc., are not easily applicable to brain data because of technical problems
relating to the selection of the regularization parameters. Also, in
their own right, such models lead to challenging high-dimensional optimization problems. In this manuscript, we present some heuristics for speeding up the overall optimization process: (a) Early-stopping, whereby one halts the optimization process when the test score (performance on leftout data) for the internal cross-validation for model-selection stops improving, and (b) univariate feature-screening, whereby irrelevant (non-predictive) voxels are detected and eliminated before the optimization problem is entered, thus reducing the size of the problem. Empirical results with GraphNet on real MRI (Magnetic Resonance Imaging) datasets indicate that these heuristics are a win-win strategy, as they add speed without sacrificing the quality of the predictions. We expect the proposed heuristics to work on other models like TV-L1, etc.
This document discusses randomized algorithms. It begins by listing different categories of algorithms, including randomized algorithms. Randomized algorithms introduce randomness into the algorithm to avoid worst-case behavior and find efficient approximate solutions. Quicksort is presented as an example randomized algorithm, where randomness improves its average runtime from quadratic to linear. The document also discusses the randomized closest pair algorithm and a randomized algorithm for primality testing. Both introduce randomness to improve efficiency compared to deterministic algorithms for the same problems.
1) The document discusses dynamics modeling for robotic manipulators using the Denavit-Hartenberg representation and Lagrangian mechanics. It describes using the Euler-Lagrange method to derive equations of motion for robotic links by computing kinetic and potential energy terms.
2) As an example, dynamics equations are derived for a simple 1 degree-of-freedom robotic arm. Kinetic and potential energy expressions are written and the Lagrangian is computed to obtain the equation of motion.
3) State-space modeling basics are reviewed using the example of a damped spring-mass system, showing how to write the system dynamics as state-space matrices to evaluate responses like step response.
The document discusses developing a wireless sensor network system for structural health monitoring using non-destructive evaluation techniques like acoustic emission testing and ultrasound testing. It outlines objectives like sensor node development, network control, and damage detection algorithms. The project status updates sensor node development and a finite element model for lamb wave propagation. Future plans include more signal processing algorithms and investigating additional non-destructive methods.
1) The document discusses using the residue theorem to evaluate a complex contour integral to calculate the Laplace transform of the output of an ideal sampler. This provides a closed-form solution that is less painful than the infinite series form.
2) An ideal sampler can be modeled as a carrier signal modulated by the input signal. The output of the sampler is then sent to a zero-order hold.
3) By choosing an appropriate contour, the complex contour integral can be evaluated using the residue theorem. This gives the Laplace transform of the sampler output in terms of the residues of the integrand's poles.
Random Matrix Theory and Machine Learning - Part 3Fabian Pedregosa
ICML 2021 tutorial on random matrix theory and machine learning.
Part 3 covers: 1. Motivation: Average-case versus worst-case in high dimensions 2. Algorithm halting times (runtimes) 3. Outlook
Lagrangian formulation provides an alternative but equivalent way to derive equations of motion compared to Newtonian mechanics.
The document provides examples of deriving equations of motion for simple harmonic oscillators, Atwood's machine, and a spring pendulum using the Lagrangian formulation. It also shows the equivalence between Lagrange's equations and Newton's second law.
Specifically, it demonstrates that for a conservative system using generalized coordinates, Lagrange's equations reduce to F=ma, where the generalized forces are equal to the negative gradient of the potential energy.
The document summarizes key concepts in social network analysis including metrics like degree distribution, path lengths, transitivity, and clustering coefficients. It also discusses models of network growth and structure like random graphs, small-world networks, and preferential attachment. Computational aspects of analyzing large networks like calculating shortest paths and the diameter are also covered.
I am Arcady N. I am a Computer Network Assignments Expert at computernetworkassignmenthelp.com. I hold a Master's in Computer Science from, City University, London. I have been helping students with their assignments for the past 10 years. I solve assignments related to the Computer Network.
Visit computernetworkassignmenthelp.com or email support@computernetworkassignmenthelp.com.
You can also call on +1 678 648 4277 for any assistance with the Computer Network Assignments.
1. The document provides an overview of digital modulation for mobile communication systems. It discusses key concepts like sampling, bandwidth, modulation theory, and digital modulation schemes.
2. The document covers sampling theory including the sampling theorem and concepts like energy, power, power spectral density, and pulse shaping filters. It explains how sampling works by modeling the sampling function as a train of Dirac impulse functions.
3. Key learning outcomes are listed and cover understanding principles of sampling and digital modulation, as well as modulation schemes like BPSK and QPSK. Concepts of bit error probability, eye diagrams, and spectrum analyzers are also introduced.
Electromagnetic Scattering from Objects with Thin Coatings.2016.05.04.02Luke Underwood
This document discusses a numerical method for modeling electromagnetic scattering from objects with thin coatings. It presents a method that properly weights the integration of near-singular behaviors introduced by thin coatings. The weighting is applied to the Fourier coefficients of Dirac delta functions. This allows the modeling of how varying a thin coating's properties alters an object's far-field scattering pattern.
Self-organizing networks can perform unsupervised clustering by mapping high-dimensional input patterns into a smaller number of clusters in output space through competitive learning. Fixed weight competitive networks like Maxnet, Mexican Hat net, and Hamming net use competitive learning with fixed weights. Maxnet uses winner-take-all competition to select the neuron whose weights best match the input. Mexican Hat net has both excitatory and inhibitory connections between neurons to enhance contrast. Hamming net determines which exemplar vector most closely matches the input using the Hamming distance measure.
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1. Distributed Algorithm
for Network Size Estimation
Donggil Lee, Seungjoon Lee, Taekyoo Kim, and Hyungbo Shim
Control & Dynamic Systems Lab. Seoul National University
57th IEEE Conference on Decision and Control
December 18, 2018
2. We propose a Distributed Algorithm for Network Size Estimation
Network size: total number N of nodes in a given network
Goal: design a node dynamics whose individual solutions all
converges to N. We pursue
decentralized design: design of node dynamics doesn't use
much information about the network
distributed algorithm: each node exchanges information only
with its neighbors
2 / 20
3. We propose a Distributed Algorithm for Network Size Estimation
Network size: total number N of nodes in a given network
Goal: design a node dynamics whose individual solutions all
converges to N. We pursue
decentralized design: design of node dynamics doesn't use
much information about the network
distributed algorithm: each node exchanges information only
with its neighbors
2 / 20
4. Distributed estimation of N is useful in many applications
For example,
Distributed Optimization [Nedic, Ozdaglar (2009)]
1 requires
N to obtain the convergence rate.
Distributed Kalman Filter [Kim, Shim, Wu (2016)]
2 requires
N is known to all nodes.
1
Nedic, Ozdaglar, Distributed subgradient methods for multi-agent
optimization, IEEE TAC, 2009
2
Kim, Shim, Wu, On distributed optimal Kalman-Bucy ltering by
averaging dynamics of heterogeneous agents, IEEE CDC, 2016
3 / 20
5. Distributed estimation of N is not trivial
N is a property of a network and so is a global parameter.
Each node is able to see only its neighbor
4 / 20
6. Previous results for network size estimation
(Baquero, et al., IEEE Trans. Parallel and Distrib. Sys., 2012)
(Lucchese, Varagnolo, ACC, 2015)
obtains the estimate ˆN in statistical manner by exchanging M
pieces of information with neighbors
⇒ the estimate is not deterministic
E[ ˆN] = N with Var[ ˆN] =
N2
M − 2
(Kempe et al., IEEE Symp. Foundations of Comp. Sci., 2003)
(Shames et al., ACC, 2012)
obtains 1/N asymptotically by average consensus
They require initialization which should be done over the network
⇒not ready for plug-and-play.
5 / 20
7. Previous results for network size estimation
(Baquero, et al., IEEE Trans. Parallel and Distrib. Sys., 2012)
(Lucchese, Varagnolo, ACC, 2015)
obtains the estimate ˆN in statistical manner by exchanging M
pieces of information with neighbors
⇒ the estimate is not deterministic
E[ ˆN] = N with Var[ ˆN] =
N2
M − 2
(Kempe et al., IEEE Symp. Foundations of Comp. Sci., 2003)
(Shames et al., ACC, 2012)
obtains 1/N asymptotically by average consensus
They require initialization which should be done over the network
⇒not ready for plug-and-play.
5 / 20
8. The proposed algorithm
Assumptions
1. Communication graph is undirected and connected with unit
weight.
2. ∃ one special node always belonging to network; say node 1.
node 1: ˙x1(t) = 1−x1(t) + k
j∈N1
xj(t) − x1(t)
all other nodes: ˙xi(t) = 1 + k
j∈Ni
xj(t) − xi(t)
gain k will be designed
algorithm is simple, only scalar xi(t) ∈ R is exchanged
initial condition xi(0) is arbitrary
6 / 20
9. The proposed algorithm
Assumptions
1. Communication graph is undirected and connected with unit
weight.
2. ∃ one special node always belonging to network; say node 1.
node 1: ˙x1(t) = 1−x1(t) + k
j∈N1
xj(t) − x1(t)
all other nodes: ˙xi(t) = 1 + k
j∈Ni
xj(t) − xi(t)
gain k will be designed
algorithm is simple, only scalar xi(t) ∈ R is exchanged
initial condition xi(0) is arbitrary
6 / 20
10. How the proposed algorithm works?
Overall dynamics:
˙x1
˙x2
.
.
.
˙xN
= −
k
l11 l12 · · · l1N
l21 l22 · · · l2N
.
.
.
.
.
.
.
.
.
.
.
.
lN1 lN2 · · · lNN
+
1 0 · · · 0
0 0 · · · 0
.
.
.
.
.
.
.
.
.
.
.
.
0 0 · · · 0
x +
1
1
.
.
.
1
=: −(kL + J11
)x + 1N (L is Laplacian matrix)
Lemma: If k 0, then the matrix −(kL + J11) is Hurwitz.
Therefore, x(t) converges to the equilibrium
x∗
= x∗
(k) = (kL + J11
)−1
1N .
Lemma: x∗
1(k) = N, ∀k 0, and x∗
i (k) → N as k → ∞ for i ≥ 2.
Therefore, if k is large enough such that |x∗
i (k) − N| 0.5, ∀i,
lim
t→∞
round(xi(t)) = lim
t→∞
xi(t) = N.
7 / 20
11. How the proposed algorithm works?
Overall dynamics:
˙x1
˙x2
.
.
.
˙xN
= −
k
l11 l12 · · · l1N
l21 l22 · · · l2N
.
.
.
.
.
.
.
.
.
.
.
.
lN1 lN2 · · · lNN
+
1 0 · · · 0
0 0 · · · 0
.
.
.
.
.
.
.
.
.
.
.
.
0 0 · · · 0
x +
1
1
.
.
.
1
=: −(kL + J11
)x + 1N (L is Laplacian matrix)
Lemma: If k 0, then the matrix −(kL + J11) is Hurwitz.
Therefore, x(t) converges to the equilibrium
x∗
= x∗
(k) = (kL + J11
)−1
1N .
Lemma: x∗
1(k) = N, ∀k 0, and x∗
i (k) → N as k → ∞ for i ≥ 2.
Therefore, if k is large enough such that |x∗
i (k) − N| 0.5, ∀i,
lim
t→∞
round(xi(t)) = lim
t→∞
xi(t) = N.
7 / 20
12. How the proposed algorithm works?
Overall dynamics:
˙x1
˙x2
.
.
.
˙xN
= −
k
l11 l12 · · · l1N
l21 l22 · · · l2N
.
.
.
.
.
.
.
.
.
.
.
.
lN1 lN2 · · · lNN
+
1 0 · · · 0
0 0 · · · 0
.
.
.
.
.
.
.
.
.
.
.
.
0 0 · · · 0
x +
1
1
.
.
.
1
=: −(kL + J11
)x + 1N (L is Laplacian matrix)
Lemma: If k 0, then the matrix −(kL + J11) is Hurwitz.
Therefore, x(t) converges to the equilibrium
x∗
= x∗
(k) = (kL + J11
)−1
1N .
Lemma: x∗
1(k) = N, ∀k 0, and x∗
i (k) → N as k → ∞ for i ≥ 2.
Therefore, if k is large enough such that |x∗
i (k) − N| 0.5, ∀i,
lim
t→∞
round(xi(t)) = lim
t→∞
xi(t) = N.
7 / 20
13. How large k should be?
To compute the minimal value of k, we impose
One more assumption
3. ∃ upper bound of network size ¯N ( ¯N N), and ¯N is known
to every node (this is the only global information needed.)
Theorem: If
k ¯N3
then the proposed algorithm
node 1: ˙x1 = 1 − x1 + k
j∈N1
(xj − x1)
all other nodes: ˙xi = 1 + k
j∈Ni
(xj − xi)
with arbitrary initial conditions yields estimation of N because
lim
t→∞
|xi(t) − N| 0.5, ∀i ∈ N.
8 / 20
14. How large k should be?
To compute the minimal value of k, we impose
One more assumption
3. ∃ upper bound of network size ¯N ( ¯N N), and ¯N is known
to every node (this is the only global information needed.)
Theorem: If
k ¯N3
then the proposed algorithm
node 1: ˙x1 = 1 − x1 + k
j∈N1
(xj − x1)
all other nodes: ˙xi = 1 + k
j∈Ni
(xj − xi)
with arbitrary initial conditions yields estimation of N because
lim
t→∞
|xi(t) − N| 0.5, ∀i ∈ N.
8 / 20
15. How to obtain N in nite time?
The problem is to nd minimal value T such that
|xi(t) − N| 0.5, ∀t T
To nd the time T, we need
convergence rate
bounded initial condition
9 / 20
16. How to obtain N in nite time?
The problem is to nd minimal value T such that
|xi(t) − N| 0.5, ∀t T
To nd the time T, we need
convergence rate
bounded initial condition
9 / 20
18. Main Result
Our last assumption (Bounded initial condition)
Suppose xi(0) ∈ [0, ¯N] for all i.
reasonable initial guess ( N ¯N)
Theorem (Finite-time Estimation of N)
Under all the assumptions, if k ¯N3, then the proposed algorithm
guarantees
xi(t) = N, ∀t T(k), ∀i
where the settling time T(k) is given by
T(k) = 4 ¯N ln
2 ¯N1.5k
k − ¯N3
.
11 / 20
19. Advantages of the proposed algorithm
node 1: ˙x1 = 1 − x1 + k
j∈N1
(xj − x1)
all other nodes: ˙xi = 1 + k
j∈Ni
(xj − xi)
1. simple rst-order dynamics
2. exchanges single variable with neighbors
3. obtains N directly within nite time
4. independent of initialization
→ while the algorithm is running, new node can join or some
node can leave the network
This property is often called
`plug-and-play ready' or
`open MAS (multi-agent system)' or
`initialization-free algorithm'
12 / 20
20. A Remark for Practical Application
1. To obtain correct estimate of N, it takes T(k) time from the
network change
2. However, not every node can detect the changes.
3. Possible solution: allow the changes only at specied time,
i.e., some nodes can join or leave the network at t = j · T
where T T(k), assuming every node has same clock.
Example scenario:
there is a unit length of time T T(k)
1. two nodes 1 and 2 belong to the network
from time T0 = 0
2. node 3 joins the network at T1 = T
3. node 3 leaves the network at T2 = 2T
13 / 20
21. A Remark for Practical Application
1. To obtain correct estimate of N, it takes T(k) time from the
network change
2. However, not every node can detect the changes.
3. Possible solution: allow the changes only at specied time,
i.e., some nodes can join or leave the network at t = j · T
where T T(k), assuming every node has same clock.
Example scenario:
there is a unit length of time T T(k)
1. two nodes 1 and 2 belong to the network
from time T0 = 0
2. node 3 joins the network at T1 = T
3. node 3 leaves the network at T2 = 2T
13 / 20
22. (two nodes belong to the network from T0 = 0)
Every node initializes its state within [0, ¯N]
Estimation is guaranteed for t T(k)
14 / 20
23. (node 3 joins the network at T1 = T )
x3(T1) is initialized within [0, ¯N]
both x1(T1) and x2(T1) are within [0, ¯N]
15 / 20
24. (node 3 leaves the network at T2 = 2T )
all x1(T2) and x2(T2) are within [0, ¯N]
correct estimation is always available for t Tj + T(k)
16 / 20
26. Blended dynamics approach
A tool for analysis of heterogeneous multi-agent system
Node's dynamics:
˙xi = fi(xi) + k
j∈Ni
xj − xi , i ∈ {1, 2, · · · , N}
Blended dynamics (average of vector elds fi):
˙s =
1
N
N
i=1
fi(s) with s(0) =
1
N
N
i=1
xi(0)
Theorem3
Suppose blended dynamics is stable. Then, ∀ 0, ∃k∗ such that
for all k ≥ k∗,
lim sup
t→∞
|xi(t) − s(t)| , ∀i.
3
Kim, Yang, Shim, Kim, Seo, Robustness of synchronization of
heterogeneous agents by strong coupling and a large number of agents, IEEE
TAC, 2016
18 / 20
27. We designed node dynamics so that their blended dynamics
has desired property.
The proposed node dynamics:
˙x1 = 1 − x1 + k
j∈N1
xj − x1
˙xi = 1 + k
j∈Ni
xj − xi , ∀j ∈ {2, . . . , N}
Their blended dynamics:
˙s =
1
N
N
i=1
fi(s) =
1
N
(N − s) = −
1
N
s + 1
Therefore, with suciently large k, we have
lim sup
t→∞
|xi(t) − s(t)| = lim sup
t→∞
|xi(t) − N| , ∀i ∈ N
information about N is embedded in the vector elds (not in
the initial conditions) → key to the `plug-and-play'.
19 / 20
28. Summary
the design of proposed algorithm is based on blended dynamics
˙s = −
1
N
s + 1
each node obtains network size exactly with arbitrary initial
condition
⇒ the algorithm supports plug-and-play operation
the estimation is guaranteed within nite time
Thank you!
Donggil Lee (dglee@cdsl.kr)
20 / 20