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检索条件"主题词=Pursuit Algorithms"

共 488 条记录，以下是71-80 订阅

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Identification of Recurring Wavefront Propagation Patterns in Atrial Fibrillation using Basis pursuit

Identification of Recurring Wavefront Propagation Patterns i...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： S. Zeemering R. Peeters A. van Hunnik S. Verheule U. Schotten Department of Physiology Maastricht University P.O. Box 616 6200 MD Maastricht The

ISBN: (纸本)9781457702150

High density contact electrogram data of atrial fibrillation (AF) contain detailed information on recurring activation patterns and dominant signaling pathways. Current methods to analyze these patterns and pathways rely mainly on supervised atrial deflection annotation and wave reconstruction. In this study, we developed a new algorithm to automatically identify recurring patterns and dominant pathways without the need for annotation. A sparse multivariate autoregression model was estimated on short segments of synchronous unipolar electrograms to extract the dominant interactions between electrograms at different recording electrodes. Sparsity of the electrode interaction matrices at several time-lags was maximized by applying a distance-weighted basis pursuit algorithm. Dominant interactions were identified by computing the mean interaction matrix over a number of consecutive time segments. The algorithm was evaluated on high-density recordings with 234 electrodes and 2.4mm electrode spacing in the left and right atrial free wall of a goat model of AF. The method was able to identify relevant patterns of AF, including wave trains, repetitive breakthrough waves and rotating wave activity.

关键词： Atrial Fibrillation atrial fibrillation autoregressive processes caprine model electrogram Electrodes High density ANNOTATIONS pursuit algorithms Right free wall accessory pathway

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pursuit algorithm for scheduling PEV charging

Pursuit algorithm for scheduling PEV charging

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International Conference on Power Engineering, Energy and Electrical Drives, POWERENG

作者： Anmar I. Arif T. P. Imthias Ahamed Essam A. Al-Ammar Saudi Aramco Chair in Electrical Power EE Department College of Engineering King Saud University Riyadh Saudi Arabia

The importance of electric vehicles (EVs) have been increasing in recent years. The electricity demands of EVs may have significant impacts on the electric power grid if the charging is not scheduled properly. This paper views PEV charging as a single stage decision making problem and proposes the use of pursuit algorithm for solving the decision making problem with the goal of minimizing the cost of PEV charging. The performance of the proposed algorithm is illustrated considering ten PEVs.

关键词： Scheduling Schedules pursuit algorithms Power engineering Electricity Decision making Learning automata

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Distorted Sparse Signal Estimation from Distributed Sign Measurements

Distorted Sparse Signal Estimation from Distributed Sign Mea...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Cai, Xiao Zhang, Zhaoyang Zhong, Caijun Zhejiang Univ Inst Informat & Commun Engn Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)9781479903085

A novel algorithm called Cooperative Binary Iterative Hard Thresholding (CB-IHT) based on distributed 1-bit compressive sensing is proposed in this paper. Taking advantage of the correlated nature of distributed signal processing, the proposed algorithm is aimed to fight against the error floor in the estimation of distorted sparse signal, with an array of agents recovering the target signal cooperatively. The principles of convex optimization, consistent reconstruction and greedy pursuit algorithm are combined in the algorithm design. With two joint sparsity models representing distortion of equivalent parallel AWGN channels and parallel fading channels separately, the algorithm is performed through extensive simulations, which show that with severe distortion and large bit-budget, estimation accuracy can be improved by simply increasing the array scale.

关键词： Signal estimation error floor Algorithm design AWGN channels Distribute distortion pursuit algorithms fight abnormal shapes Bigeminy

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Oblique pursuits for compressed sensing with random anisotropic measurements

Oblique pursuits for compressed sensing with random anisotro...

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IEEE International Symposium on Information Theory

作者： Kiryung Lee Yoram Bresler Marius Junge Coordinated Science Laboratory and Department of ECE University of Illinois Urbana-Champaign Urbana IL USA Department of Mathematics University of Illinois Urbana-Champaign Urbana IL USA

Compressed sensing enables universal, simple, and reduced-cost acquisition by exploiting a sparse signal model. Most notably, recovery of the signal by computationally efficient algorithms is guaranteed for certain random measurement models, which satisfy the so-called isotropy property. However, in real-world applications, this property is often not satisfied. We propose two related changes in the existing framework for the anisotropic case: (i) a generalized RIP called the restricted biorthogonality property (RBOP); and (ii) correspondingly modified versions of existing greedy pursuit algorithms, which we call oblique pursuits. Oblique pursuits provide recovery guarantees via the RBOP without requiring the isotropy property; hence, these recovery guarantees apply to practical acquisition schemes. Numerical results show that oblique pursuits also perform better than their conventional counterparts.

关键词： pursuit algorithms Dictionaries Transforms Vectors Matching pursuit algorithms Information theory Computational modeling

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A path tracking algorithm of intelligent vehicle by preview strategy

A path tracking algorithm of intelligent vehicle by preview ...

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Chinese Control Conference (CCC)

作者： Liu Rui Jianmin Duan Intelligent Measurement & Control Laboratory Beijing University of Technology Beijing CN

Based on the characteristics of the intelligent vehicle during steering, this work designed a control system that is easy to be applied. This work built a dynamical model of vehicle by two-freedom model, in which the method of calculating the look-ahead distance is improved by the modification to preview strategy based on the pure pursuit tracking method, so that the vehicle can get close to the desired path smoothly. The controller is designed by a linear PD control method, which decreases the tracking error. To make sure that the process can get the desired steering angle to control the vehicle accurately, this work designed a PID closed-loop control method for steering angle at underlying control. In the end, the test proved the feasibility and effectiveness of the method. With this method, the dynamic characteristics of the controller and the adaptability can be improved.

关键词： Vehicles Wheels Vehicle dynamics Intelligent vehicles Heuristic algorithms pursuit algorithms Algorithm design and analysis

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Multi-antenna OFDM channel feedback compression exploiting sparsity

Multi-antenna OFDM channel feedback compression exploiting s...

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European Wireless 2013;19th European Wireless Conference

作者： Thorsten Wild Cornelis Hoek Guenther Herzog Johannes Koppenborg The authors are with Bell Laboratories

In order to enable advanced downlink multiantenna techniques, like MU-MIMO or Network MIMO, accurate channel knowledge at the transmitter is required. In order to save scarce uplink resources, the feedback has to be compressed. This paper provides a practical channel feedback compression technique which exploits the sparse nature of radio channels and removes redundant and irrelevant information. It introduces a novel path detection algorithm by modifying the existing orthogonal matching pursuit algorithm. Furthermore it presents efficient practical bit loading techniques. Channel aging effects can be efficiently handled by prediction, as shown in this paper. The prediction integrates very well into the presented feedback compression framework. For application to existing radio propagation channel compression, measurement results are discussed, dealing with the question how sparse the actual channel is.

关键词： multiple antenna Feedback wireless channels ageing effects Redundant Transmitters Orthogonal frequency division multiplexing pursuit algorithms Matching pursuit algorithms compression order

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AUTONOMOUS DECENTRALIZED COORDINATION CONTROL FOR FRACTIONATED SPACECRAFT FORMATION RECONFIGURATION BASED ON CYCLIC pursuit STRATEGY

AUTONOMOUS DECENTRALIZED COORDINATION CONTROL FOR FRACTIONAT...

引用

1st International-Academy-of-Astronautics Conference on Dynamics and Control of Space Systems (DyCoSS)

作者： Hu Min Zeng Guoqiang Acad Equipment Beijing Peoples R China

ISBN: (纸本)9780877035879

The current paper investigates the decentralized coordination control problem of fractionated spacecraft and proposes a new concept of finite-time cyclic pursuit algorithm for its practical implementation. Firstly, the relative translational dynamics of fractionated spacecraft and the general formation configuration description method are proposed, and the algebraic graph theory is introduced. Then, three-dimensional finite-time cyclic pursuit algorithms are put forward for both single-integrator kinematics and double-integrator dynamics, which guarantee the convergence of tracking errors in finite time rather than in the asymptotic sense. Finally, numerical simulations on finite-time cyclic pursuit algorithms and formation reconfigurations based on cyclic pursuit strategies are carried out. The simulation results have demonstrated the superior performance of finite-time cyclic pursuit algorithms, including the global fast convergence of tracking errors in finite time and the higher tracking accuracy. Moreover, the cyclic pursuit control is a very promising technique for fractionated spacecraft free flying, because it is leaderless, easy for implementation, and most important of all, it only requires the local information for control.

关键词： pursuit algorithms Spacecraft Decentralized Graph theory Standing Orders formation local information. follow error cyclic Information control

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pursuit Algorithm for optimized load scheduling

Pursuit Algorithm for optimized load scheduling

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International Power Engineering and Optimization Conference (PEOCO)

作者： S. Q. Ali S. D. Maqbool T. P. Imthias Ahamed N. H. Malik Saudi Aramco Chair in Electrical Power Department of Electrical Engineering King Saud University Riyadh Saudi Arabia

Demand Response (DR) has gained importance in the recent years. The prime objective of DR is to reduce the maximum demand. There are various DR schemes. This study focuses on price based DR schemes in which consumer is motivated to change his load demand pattern by pricing based incentives. The paper presents an algorithm to solve the load scheduling problem under variable pricing scheme. To this end the paper formulates the load scheduling problem as a singe stage decision making problem and solves it using pursuit Algorithm, which maintains an agreeable balance between exploration and exploitation. An algorithm to generate realistic loads is also presented. Simulation experiments were conducted considering different types of loads and pricing.

关键词： Load modeling Optimization pursuit algorithms Pricing Switches Scheduling Power engineering

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LOW COMPLEXITY APPROXIMATE CYCLIC ADAPTIVE MATCHING pursuit

LOW COMPLEXITY APPROXIMATE CYCLIC ADAPTIVE MATCHING PURSUIT

引用

European Signal Processing Conference

作者： Alexandru Onose Bogdan Dumitrescu Department of Signal Processing Tampere University of Technology

ISBN: (纸本)9781467310680

Based on the iterated cyclic adaptive matching pursuit algorithm, we construct a low complexity approximate variant for finding sparse solutions to systems of linear equations. We employ a greedy neighbor permutation strategy coupled with an approximate scalar product matrix to ensure that the complexity of the algorithm remains low. The sparse solution is cyclically updated improving the performance while the spar-sity level is estimated online using the predictive least squares criterion. The performance of the algorithm is similar to that of the non approximate variants while the complexity can be considerably lower.

关键词： Matching pursuit Sparse filters Greedy algorithm Channel identification Complexity Linear system of equations Approximate Matching pursuit algorithms pursuit algorithms Dot product algorithms

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Comparison of pursuit and ε-Greedy algorithm for load scheduling under real time pricing

Comparison of pursuit and ε-Greedy algorithm for load sched...

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National Proceedings Power and Energy Conference (PECon)

作者： S. D. Maqbool T. P. Imthias Ahamed S.Q. Ali F.R. Pazheri N.H. Malik Saudi Aramco Chair in Electrical Power EE Department College of Engineering King Saud University Riyadh Saudi Arabia

Demand Response (DR) is a useful tool to develop a balance between the available generation and loads under smart grid environment. There are various price based schemes to implement DR and flatten the load profile. Hence, for the benefit of customers, proper load scheduling is required to lower the usage of electricity during peak load periods in order to decrease the electricity cost. This work formulates load scheduling as multi stage decision making problem or Markov Decision Problem (MDP). Reinforcement learning (RL) has been used to solve many decision making problems under stochastic environment. ε-Greedy algorithm is the most popular exploration method used in RL. In this paper, pursuit algorithm is developed to achieve a balance between exploration and exploitation process of the RL. The performance of both the algorithms is compared which shows the supremacy of pursuit Algorithm over ε-greedy algorithm.

关键词： pursuit algorithms Electricity Switches Conferences Greedy algorithms Pricing Schedules

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