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检索条件"主题词=algorithm design and analysis"

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A high performance phased antenna array design and analysis using fast algorithm

A high performance phased antenna array design and analysis ...

引用

Antennas and Propagation Society International Symposium

作者： Tao Yuan Le-Wei Li Jian-Ying Li Ning Yuan Mook-Seng Leong Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore

ISBN: (纸本)1424401224

Phased array antennas have found an increased application in radar and, more recently, in satellite and cellular communications. The most recent application concerns smart antennas in cellular base stations. Despite increased popularity, the design and development of a planar phased array antenna remains a challenging task. In this paper, a high preference phased antenna array is designed. Compared with the traditional one, this type of antenna array has a lower sidelobe characteristic. The sidelobe lever is reduced by using the taper structure. For different scanning angle, the comparison between calculated and measured results in general is in very good agreement. Moreover, the precorrected fast Fourier transform (P-FFT) method is employed to accelerate the entire computational process to reduce significantly both the memory requirement and computational time for large arrays. Very good agreement has been obtained between calculated and measured performance of such arrays. Calculated results of radiation patterns return loss, and gain of the arrays are shown and the experimental results show reasonable agreement with the theory and simulation

关键词： Phased arrays algorithm design and analysis Antenna arrays Performance analysis Radar antennas Satellite antennas Radar applications Spaceborne radar Artificial satellites Base stations

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design and analysis of QoS-Enabled Handover algorithm for Aeronautical Communication Systems

Design and Analysis of QoS-Enabled Handover Algorithm for Ae...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： H. Che P.M.L. Chan Y.F. Hu University of Bradford UK

This paper describes a framework of an inter-satellite system handover algorithm integrating IETF's mobile IP and RSVP protocols for aeronautical passenger communications. The baseline communication network architecture provides personal communications and Internet access for aircraft passengers. A functional model for mobility and QoS management to ensure seamless handover is described, where a possible method to enhanced the performance of RSVP over satellite link is presented. This model has been simulated using OPNET and some initial results from the simulation of the signalling performance of the integrated HO algorithm for real-time and non real-time applications are discussed

关键词： algorithm design and analysis Quality of service Mobile communication Aircraft Access protocols Artificial satellites Bit error rate Communication networks IP networks Internet

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Genetic algorithm optimization for aerospace electromagnetic design and analysis

Genetic algorithm optimization for aerospace electromagnetic...

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IEEE Conference on Aerospace Applications

作者： J.M. Johnson Y. Rahmat-Samii Department of Electrical Engineering University of California Los Angeles Los Angeles CA USA

This paper provides a tutorial overview of a new approach to optimization for aerospace electromagnetics known as the Genetic algorithm. Genetic algorithm (GA) optimizers are robust, stochastic search methods modeled on the concepts of natural selection and evolution. The relationship between traditional optimization techniques and GA is discussed and the details of GA optimization implementation are explored. The tutorial overview is followed by a number of applications in which GA has proved useful. The applications discussed include the design of lightweight, broad-band microwave absorbers, the reduction of array sidelobes in thinned arrays, the design of shaped beam antenna arrays, and the extraction of natural resonance modes of radar targets from the backscattered response data. Genetic algorithm Optimization is shown to be suitable for optimizing a broad class of problems of interest to aerospace antennas and related electromagnetics.

关键词： Genetic algorithms design optimization algorithm design and analysis Microwave antenna arrays Optical arrays Electromagnetics Optimization methods Robustness Stochastic processes Search methods

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design and analysis of a leader election algorithm for mobile ad hoc networks

Design and analysis of a leader election algorithm for mobil...

引用

International Conference on Network Protocols

作者： S. Vasudevan J. Kurose D. Towsley Department of Computer Science University of Massachusetts Amherst USA

Leader election is a very important problem, not only in wired networks, but in mobile, ad hoc networks as well. Existing solutions to leader election do not handle frequent topology changes and dynamic nature of mobile networks. We present a leader election algorithm that is highly adaptive to arbitrary (possibly concurrent) topological changes and is therefore well-suited for use in mobile ad hoc networks. The algorithm is based on finding an extrema and uses diffusing computations for this purpose. We show, using linear-time temporal logic, that the algorithm is "weakly" self-stabilizing and terminating. We also simulate the algorithm in a mobile ad hoc setting. Through our simulation study, we elaborate on several important issues that can significantly impact performance of such a protocol for mobile ad hoc networks such as choice of signaling, broadcast nature of wireless medium etc. Our simulation study shows that our algorithm is quite effective in that each node has a leader approximately 97-99% of the time in a variety of operating conditions.

关键词： algorithm design and analysis Nominations and elections Mobile ad hoc networks Network topology Wireless sensor networks Mobile computing Ad hoc networks Computational modeling Communication system control Batteries

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design and Implementation of a Parallel Heterogeneous algorithm for Hyperspectral Image analysis Using HeteroMPI

Design and Implementation of a Parallel Heterogeneous Algori...

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International Symposium on Parallel and Distributed Computing

作者： David Valencia Alexey Lastovetsky Antonio Plaza Department of Computer Science University of Extremadura Caceres Spain School of Computer Science & Informatics University College Dublin Dublin Ireland

ISBN: (纸本)9780769526381;0769526381

The development of efficient techniques for transforming the massive volume of remotely sensed hyperspectral data collected on a daily basis into scientific understanding is critical for space-based Earth science and planetary exploration. Although most available parallel processing strategies for hyperspectral image analysis assume homogeneity in the computing platform, heterogeneous networks of computers represent a promising cost-effective solution expected to play a major role in many on-going and planned remote sensing missions. To address the need for cost-effective parallel hyperspectral imaging algorithms, this paper develops an innovative heterogeneous parallel algorithm for spatial/spectral morphological analysis of hyperspectral image data. The algorithm has been developed using heterogeneous MPI (HeteroMPI), an extension of MPI for programming high-performance computations on heterogeneous networks of computers. Experimental results are presented and discussed in the context of a realistic application, based on hyperspectral data collected by NASA 's Jet Propulsion Laboratory

关键词： algorithm design and analysis Hyperspectral imaging Image analysis Hyperspectral sensors Computer networks Concurrent computing Geoscience Parallel processing Remote sensing Parallel algorithms

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Micro rotation sensor design and analysis with a modified FDTD algorithm

Micro rotation sensor design and analysis with a modified FD...

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International Nano-Optoelectronics Workshop (i-NOW)

作者： Chao Peng Zhengbin Li Anshi Xu State Key Laboratory of Advanced Optical Communication Systems & Networks Peking University Beijing China

We propose a modified FDTD algorithm to design and analyze micro sensitive rotation sensor based on rotating optical element. The algorithm can be applied to photonic structures with various material properties and co... 详细信息

关键词： Finite difference methods Sagnac interferometers Time domain analysis algorithm design and analysis Optical waveguides Optical sensors Optical fiber networks

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An improved design algorithm based on interval analysis for spatial parallel manipulator with specified workspace

An improved design algorithm based on interval analysis for ...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： J.-P. Merlet I.N.R.I.A. Sophia Antipolis Sophia-Antipolis France

ISBN: (纸本)0780365763

We propose an algorithm that enable one to determine almost all the geometries of a simplified Gough platform whose workspace must include an arbitrary set of poses. Five design parameters have been identified and we assume that the stroke of the linear actuator is known. This algorithm is based on an interval analysis approach and its result is a set of ranges for the design parameters such that the workspace of any robot whose geometry is defined by values within the ranges will include the specified poses.

关键词： algorithm design and analysis Computational geometry Leg Parallel robots Service robots Bismuth Hydraulic actuators Robot kinematics

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design and analysis of an ARQ based symmetric key generation algorithm

Design and analysis of an ARQ based symmetric key generation...

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MILCOM, Military Communications Conference

作者： Yahya S. Khiabani Shuangqing Wei Department of Electrical and Computer Engineering (ECE) Louisiana State University Baton Rouge LA USA

The main idea in this paper is to design and analyze a symmetric key generation algorithm whereby we can strengthen wireless network security. Our main goal is generating a sequence of highly secure secret keys based on an ARQ based transmission mechanism that relies on the statistical independence of channel errors between the attacker and legitimate users. This leads to some information loss for the adversary which allows us to constantly extract keys by using universal Hashing techniques from communication process, about which we can make sure that adversarys knowledge remains negligible. More specifically, the key generation algorithm is analyzed and designed in a way that targeted security as well as the required throughput and synchronization goals for the transmission are achieved. Simulation results show that the designed algorithm achieves the desired requirements for both system security and throughput.

关键词： Protocols Synchronization Throughput Automatic repeat request Security algorithm design and analysis Privacy

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Computational Complexity analysis and algorithm design for Combinatorial Optimization Problems

Computational Complexity Analysis and Algorithm Design for C...

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International Conference on Networking and Computing (ICNC)

作者： Toshimasa Watanabe Graduate School of Engineering Hiroshima University Higashi-Hiroshima Japan

The paper shows summary of the author's research subjects from 1973 through 2012. Additional explanation on these subjects and related references are omitted because of space limitation. They will be given at pres... 详细信息

ISBN: (纸本)9781467346245

关键词： Petri nets algorithm design and analysis Educational institutions Automata Heuristic algorithms Time complexity Wiring

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design and analysis for Acoustic Emission Source Location algorithm of Three-Dimensional Braided Composites

Design and Analysis for Acoustic Emission Source Location Al...

引用

International Conference on Measuring Technology and Mechatronics Automation, ICMTMA

作者： Yi Li Zhen-kai Wan Jia-lu Li Sch. of Textile Tianjin Polytech. Univ. Tianjin China Sch. of Comput. Technol. & Autom. Tianjin Polytech. Univ. Tianjin China Key Labortory of Adv. Textile Composite Mater. of Minist. of Educ. Tianjin Polytech. Univ. Tianjin China

The technique is established for performance-analysis and inner failure location of three-dimensional braided composites, which is based on the wave transmission of the acoustic emission and the equation of time location method. We have a few of failure three-dimensional braided composites which is seemed a crack on the material obviously. The crack is formed by the break yarn when the material are braiding. The difference is compared between the measure and acoustic emission detection method. Experimental results show that acoustic emission source location algorithm by the computer agreed well with the actual location.

关键词： algorithm design and analysis Acoustic emission Position measurement Composite materials Acoustic sensors Acoustic testing Acoustic signal detection Sensor arrays Aerospace materials Monitoring

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