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Congress on Evolutionary Computation

作者： S. Janson M. Middendorf Parallel Computing and Complex Systems Group Department of Computer Science University of Leipzig Leipzig Germany

A hierarchical version of the particle swarm optimization method called H-PSO is introduced. In H-PSO the particles are arranged in a dynamic hierarchy that is used to define a neighborhood structure. Depending on the quality of their so far best found solution the particles move up or down the hierarchy so that good particles have a higher influence on the swarm. Moreover, the hierarchy is used to define different search properties for the particles. Several variants of H-PSO are compared experimentally with variants of the standard PSO.

关键词： Particle swarm optimization Iterative algorithms parallel processing computer science Optimization methods Tree data structures Iterative methods Multidimensional systems Velocity control

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A new end-to-end authentication protocol for mobile users to access internet services 17th

A new end-to-end authentication protocol for mobile users to...

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17th International Conference on Information Security, SEC 2002

作者： He, Li-Sha Zhang, Ning He, Li-Rong Mobile Architecture Systems Group Department of Computer Science University of Manchester M13 9PL United Kingdom

ISBN: (纸本)9781475710267

When a mobile user using wireless devices tries to access to a Service Provider (SP) connected to wire-lined network such as the Internet, security risks experienced by SP as well as the wireless and wire-lined network providers are greater. The mobility and resource-limited nature exhibited by the wireless devices only make the security provision in such a context ever challenging. This paper attempts to set a step forward toward finding an asymmetrical approach to the provision of security to mobile users by re-examining the issue of end-to-end authentication. Having first examined the special security and performance requirements in this application context, the paper surveys the related work in the subject area, and then presents a new network-assisted endtoend authentication and key exchange protocol suited to mobile users in their access to Internet services. © IFIP International Federation for Information Processing 2002.

关键词： Authentication

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Exploiting Locality in Single Assignment Data Structures Updated Through Split-Phase Transactions

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Cluster Computing 2001年第4期4卷 281-293页

作者： Amaral, José Nelson Lin, Wen-Yen Gaudiot, Jean-Luc Gao, Guang R. Department of Computing Science University of Alberta Edmonton Canada Tia Mobile Inc. Pasadena USA Department of Electrical Engineering University of Southern California Los Angeles USA Computer Architecture and Parallel Systems Laboratory Department of Electrical and Computer Engineering University of Delaware Newark USA

We present the design, implementation, and evaluation of single assignment data structures and of a software controlled cache in an existing multi-threaded architecture platform – the Efficient architecture for Running Threads (EARTH). The I-Structure Software-Controlled Cache (ISSC) exploits temporal and spatial locality of EARTH split-phased memory transactions for single-assignment memory references. Our experimental evaluation indicates that the caching mechanism for single-assignment storage makes the EARTH memory system more robust to variations in the latency of memory operations. As a consequence the system can be ported to a wider range of machine platforms and deliver speedup for both regular and irregular application.

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PERFORMANCE ANALYSIS OF A MAC PROTOCOL FOR BROADBAND WIRELESS ATM NETWORKS WITH QUALITY OF SERVICE PROVISIONING

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Journal of Interconnection Networks 2001年第1期2卷 103-130页

作者： B. VAN HOUDT C. BLONDIA O. CASALS J. GARCÍA University of Antwerp Department of Mathematics and Computer Science Performance Analysis of Telecommunication Systems Research Group Universiteitsplein 1 B-2610 Antwerp Belgium Polytechnic University of Catalunya Computer Architecture Department C/Jordi Girona 1-3 E-08034 Barcelona Spain

This paper presents a Medium Access Control (MAC) protocol for broadband wireless LANs based on the ATM transfer mode, together with the evaluation of its performance in terms of throughput and access delay. Important characteristics of the MAC protocol are the way information between the Mobile Stations (MSs) and the Base Station (BS) is exchanged and the algorithm used to allocate the bandwidth in order to support the service categories. A detailed analytical evaluation, both on cell level and packet level, leads to an assessment of the efficiency and the access delay of the system.

关键词： Quality of Service Medium Access Control Wireless ATM

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A heuristic algorithm for mapping communicating tasks on heterogeneous resources

A heuristic algorithm for mapping communicating tasks on het...

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Heterogeneous Computing Workshop

作者： K. Taura A. Chien Computer Systems and Architecture Group Computer Science and Engineering University of California San Diego USA Department of Information Science University of Tokyo

A heuristic algorithm that maps data processing tasks onto heterogeneous resources (i.e. processors and links of various capacities) is presented. The algorithm tries to achieve a good throughput of the whole data processing pipeline, taking both parallelism (load balance) and communication volume (locality) into account. It performs well both under computationally intensive and communication-intensive conditions. When all tasks/processors are of the same size and communication is negligible, it quickly distributes the computation load over the processors and finds the optimal mapping. As communication becomes significant and reveals a bottleneck, it trades parallelism for reduction of communication traffic. Experimental results using a topology generator that models the Internet show that it performs significantly better than communication-ignorant schedulers.

关键词： Heuristic algorithms Data processing parallel processing Throughput Pipelines Distributed computing Traffic control Topology Internet Processor scheduling

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Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 1999年 1697卷 V页

作者： Dongarra, Jack Luque, Emilio Margalef, Toms University of Tennessee OakRidge National Laboratory 107 Ayres Hall KnoxvilleTN United States Universitat Autònoma of Barcelona Computer Science Department Computer Architecture and Operating Systems Group Bellaterra BarcelonaTN Spain

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A high performance distributed database system for enhanced internet services

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International Conference and Exhibition on High-Performance Computing and Networking, HPCN 1998

作者： Peddemors, A. Hertzberger, L.O. University of Amsterdam Department of Computer Science Computer Architecture and Parallel Systems Group Kruislaan 403 1098 SJ Amsterdam Netherlands

ISBN: (纸本)3540644431

Using a distributed database system as part of a distributed web server architecture has obvious advantages. It is shown that a first phase distributed database system can be build by extending an existing object oriented database system with application specific additions. A web database is implemented, as part of a traditional HTTP based distributed web server, using this distributed database system. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Distributed database systems

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Design issues for high performance simulation

Design issues for high performance simulation

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作者： Sloot, P.M.A. Pimentel, A.D. Hertzberger, L.O. Parallel Scientific Computing and Simulation Group Department of Computer Science University of Amsterdam Kruislaan 403 1098 SJ Amsterdam Netherlands Computer Architecture and Parallel Systems Group Department of Computer Science University of Amsterdam Kruislaan 403 1098 SJ Amsterdam Netherlands

One of the key issues in designing new simulation models for parallel execution, or in the migration of existing models to parallel platforms, is the mapping of the application architecture to the parallel system architecture. In this mapping process, we can easily loose track of the inherent locality present in the different architecture layers. In this paper, we present an overview of these issues and examine, by means of several case-studies, the consequences of the design and implementation choices for the various mapping processes. We will show that the potential for high performance simulation comes from a holistic approach, taking into account all aspects from the application to the underlying hardware. © 1998 Elsevier science B. V. All rights reserved.

关键词： parallel processing systems

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Document replacement policies dedicated to Web caching

Document replacement policies dedicated to Web caching

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IEEE International Symposium on Intelligent Control (ISIC)

作者： A. Belloum L.O. Hertzberger Computer Architecture and Parallel Systems Group Department of Computer Science Universiteit van Amsterdam Amsterdam Netherlands

Web caching has been considered as a powerful solution to deal with the growth of Web traffic. Several studies have shown that caching documents throughout the Internet can save network bandwidth and reduce document access latency. However, this technique has introduced new problems such as maintaining the document coherency and selecting the next document to be removed. With the continuous increase in demand for documents, the Web cache servers are becoming the new bottleneck. A need for better resource management is becoming urgent in order to reduce the overhead sustained by Web cache servers. In this paper, a number of Web replacement policies are discussed and compared on the basis of trace-driven simulations. The impact of the Web cache server configuration is pointed out through a set of experiments that use the cache size as a tuning parameter.

关键词： Delay computer architecture computer science Telecommunication traffic Bandwidth Network servers Resource management Topology Joining processes Cache storage

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