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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Kyu-Tae Jin Dong-Ho Cho Department of Electrical and Computer Engineering Communication and information systems Laboratory Korea Advanced Institute of Science and Technology Daejeon South Korea

Energy efficiency is an important issue in wireless ad-hoc networks since the battery power of terminals is limited. The energy efficient MAC algorithm is based on reservation and scheduling for wireless ad-hoc networks. In this paper, we drive the optimal threshold energy level for the Pseudo Base Station (PBS) reselection in the energy efficient MAC through mathematical analysis.

关键词： Energy states Energy efficiency Ad hoc networks

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Active distributed monitoring for dynamic large-scale networks

Active distributed monitoring for dynamic large-scale networ...

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IEEE International Conference on communications (ICC)

作者： A. Liotta G. Pavlou G. Knight Center for Communication Systems Research University of Surrey Guildford UK Computer Science Department University College London London UK

Networks offering services of high availability and quality need to be carefully monitored. Their increasing size and complexity stresses the ability of currently used static centralized systems. Decentralized approaches are possible and a key issue is the placement of area monitoring stations for optimal operation. Previous research has resulted in computationally expensive algorithms that require a global centralized network view. In this paper we propose a much simpler distributed algorithm and show that it performs as well as existing near-optimal but expensive, centralized algorithms. In addition, we propose that area monitoring stations are mobile agents, cloning and optimally placing themselves by executing the proposed algorithm. As network conditions change, e.g. through faults or persisting congestion, agents can adapt and migrate to new locations. We quantify the benefits of our approach against both the centralized and centrally-computed static distributed approaches.

关键词： Monitoring Large-scale systems communication system traffic control Telecommunication traffic Software agents Delay Context computer science Educational institutions Optical wavelength conversion

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Application of computational intelligence techniques in active networks

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Soft Computing 2001年第4期5卷 264-271页

作者： Vasilakos, A. V. Anagnostakis, K. G. Pedrycz, W. Institute of Computer Science (ICS) Foundation of Research and Technology-HELLAS (FORTH) P.O.Box 1385 71110 Heraklion Crete Greece GR Distributed Systems Lab CIS Department University of Pennsylvania US Department of Electrical and Computer Engineering University of Alberta Canada CA

Computational intelligence techniques have been successfully used for solving control problems in packet-switching network architectures. The introduction of active networking adds a high degree of flexibility in customizing the network infrastructure and introducing new functionality. Therefore, there is a clear need for investigating both the applicability of computational intelligence techniques in this new networking environment, as well as the provisions of active networking technology that computational intelligence techniques can exploit for improved operation. We report on the characteristics of these technologies, their synergy and on outline recent efforts in the design of a computational intelligence toolkit and its application to routing on a novel active networking environment.

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Architectural issues for cross-organisational B2B interactions

Architectural issues for cross-organisational B2B interactio...

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International Conference on distributed Computing systems Workshop

作者： K. Schulz M.E. Orlowska DSTC Private Limited. CRC for Distributed Systems Technology University of Queensland QLD Australia Department of Computer Science and Electrical Engineering University of Queensland QLD Australia

ISBN: (纸本)0769510809

In a world of electronic interconnectivity, concepts for process automation within an organisation need to be extended to support co-operation with customers and partners across organisational boundaries. Current workflow standards provide only limited support to enable this interconnectivity. We propose a model for tiering business processes into the private business processes of organisations and those shared business processes that interconnect them. Private business processes can expose interaction points, and shared processes can link to these points so that an overall business process may span two or more organisations. The interaction points can selectively expose information about the processes and process tasks of an organisation. This paper also shows how these ideas can be supported by a coordinating architecture and describes a prototype that implements the key ideas. The proposed architecture that supports inter-organisational business processes was initially validated in the Vega final demonstration that brought together six different companies in a virtual enterprise. The implementation built upon OMG's Workflow Management Facility Specification concept for inter-workflow management interfaces, incorporated existing workflow management systems, including SAP R/3, and also non-process-oriented systems. Available services were selected at run time according to their capabilities and their availability. Experience from the demonstration with all the involved components showed a dynamic linkage between existing business processes and reliable communication between the business partners.

关键词： Workflow management software Companies Prototypes Business communication Cyclic redundancy check Australia Automation Standards organizations Data structures Virtual enterprises

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Middleware support for voting and data fusion

Middleware support for voting and data fusion

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International Conference on Dependable systems and Networks (DSN)

作者： D.E. Bakken Z. Zhan C.C. Jones D.A. Karr School of Electrical Engineering and Computer Science Washington State University Pullman WA USA Distributed Systems and Logistics Department BBN Technologies GTE Cambridge MA USA

Middleware is a class of software systems above the operating system which is becoming widely used for programming distributed systems. Voting is a fundamental operation when distributed systems involve replicated components. However support for voting in middleware is very limited. The paper describes issues involved with supporting voting, and more general data fusion, in middleware. We describe the Voting Virtual Machine (VVM) architecture, which can be embedded in different middleware substrates such as .NET and CORBA. We also describe its companion Voting Definition Language (VDL), which allows for portable description of voting algorithms. The VVM and VDL, together with the external VVM voting manager provide for voting transparency and adaptive voting. Finally, we describe how the simple "byte-by-byte" value comparison schemes used in other voting middleware as well as in byzantine fault tolerant multicast systems do not work in the face of the heterogeneity inherent in distributed systems.

关键词： Middleware Voting computer science Software systems Virtual machining Fault tolerant systems Availability distributed computing Logistics Content addressable storage

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The practice in the Web-based teaching and learning for three years

The practice in the Web-based teaching and learning for thre...

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International Conference on Advanced Learning Technologies (ICALT)

作者： Fuzong Lin Xiaoyan Xie State Key Laboratory of Intelligent Technology and Systems Computer Science & Technology Department Tsinghua University Beijing China Department of Communication Tsinghua University Beijing China

The World Wide Web has created major a innovation in the way knowledge is transferred. Since 1998, we have offered a Web-based multimedia technology course for on-campus and off-campus graduates in our country. In this paper, we describe the teaching and learning system we have developed, together with the model for teaching and learning, and we report the results of using it over the past three years.

关键词： Education Internet Multimedia systems Learning systems Speech synthesis XML Laboratories Intelligent systems computer science Postal services

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Design and implementation of Automatic Parallel Detection Layer

Design and implementation of Automatic Parallel Detection La...

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IEEE International Conference on systems, Man and Cybernetics

作者： M. Ahamed H. Eldeeb S. Nassar N. Bagherzadeh Computer Science Mathematics Department Faculty of Science Cairo University Cairo Egypt Electrical and Computer Engineering University of California Irvine Irvine CA USA Computer & Control Department Electronic Research Institute Head of Parallel and Distributed Systems team Cairo Egypt Chair of Electrical and Computer Engineering University of California Irvine Irvine CA USA

We develop a new software layer called the Automatic Parallel Detection Layer (APDL) for the automatic transformation from sequential to parallel code. The main interest, in this research, is the parallelism at loop level, because significant parallelism in programs almost invariably occurs in loops. The proposed APDL has five processes for code transformation: the sequential source code parser, data dependence analysis of this code, partitioning, scheduling both task and data, and generating parallel source code. Many cases have been studied to evaluate the performance of the developed layer. The performance is evaluated depending on the execution time of: the sequential code, the parallel programmer code, and the code output from APDL for the same case study. Performance results show that APDL greatly improves the execution time with respect to sequential execution time, and saves on the high cost of a parallel programmer.

关键词： Parallel processing Concurrent computing Programming profession Electronic mail Program processors distributed computing High performance computing computer science Automatic control Parallel programming

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Algorithm design and prototype of a low-cost electromagnetic inductance real-time 6D-tracker

Algorithm design and prototype of a low-cost electromagnetic...

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International Conference on Information Networking

作者： T. Sakurada O. Atoda M. Nakagawa K. Kiyokawa Department of Computer Science Tokyo University of Agriculture and Technology Koganei Tokyo Japan Communication Research Laboratory Ministry of Posts and Telecommunications Japan Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology Japan

ISBN: (纸本)0769509517

Real-time 6D-trackers based on electromagnetic inductance sensing have previously employed 3-axis coaxial direct current coils for both transmission and reception. Here, with the objective of a low-cost, practical system, we discuss a position-calculating algorithm for an electromagnetic inductance real-time 6D-tracker that employs two 1-axis coils and one 3-axis coil and describe the construction of a prototype system. This system has the potential of realizing a real-time 6D-tracker that costs several hundred dollars. It is expected that the measurement range and accuracy will be improved by increasing the number of transmitting coils, and we think it useful making 3D virtual common space by network at low-cost. We show the experimental system of an electronic white board.

关键词： Algorithm design and analysis Prototypes Coils Electromagnetic induction Inductance Real time systems Coaxial components Costs Electromagnetic measurements Extraterrestrial measurements

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An algorithm for finding signals of unknown length in DNA sequences

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Bioinformatics 2001年第SUPPL. 1期17卷 S207-S214页

作者： Pavesi, Giulio Mauri, Giancarlo Pesole, Graziano Department of Computer Science Systems and Communication University of Milan-Bicocca Milan I-20126 Via Bicocca degli Arcimboldi 8 Italy Department of General Physiology and Biochemistry University of Milan Milan I-20133 Via Celoria 20 Italy

Pattern discovery in unaligned DNA sequences is a challenging problem in both computer science and molecular biology. Several different methods and techniques have been proposed so far, but in most of the cases signals in DNA sequences are very complicated and avoid detection. Exact exhaustive methods can solve the problem only for short signals with a limited number of mutations. In this work, we extend exhaustive enumeration also to longer patterns. More in detail, the basic version of algorithm presented in this paper, given as input a set of sequences and an error ratio ε < 1, finds all patterns that occur in at least q sequences of the set with at most εm mutations, where m is the length of the pattern. The only restriction is imposed on the location of mutations along the signal. That is, a valid occurrence of a pattern can present at most [εi] mismatches in the first i nucleotides, and so on. However, we show how the algorithm can be used also when no assumption can be made on the position of mutations. In this case, it is also possible to have an estimate of the probability of finding a signal according to the signal length, the error ratio, and the input parameters. Finally, we discuss some significance measures that can be used to sort the patterns output by the algorithm. © Oxford University Press 2001.

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Design and experimental evaluation of a self-tuning controller supplementing a robust PID controller

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JSME International Journal, Series C: Mechanical systems, Machine Elements and Manufacturing 2001年第1期44卷 53-60页

作者： Namba, Ryosuke Yamamoto, Toru Kaneda, Masahiro Department of Mechanical Engineering Graduate School of Engineering Hiroshima University 1-4-1 Kagamiyama Hiroshima 739-8527 Japan Department of Technology and Information Education Faculty of Education Hiroshima University 1-1-1 Kagamiyama Hiroshima 739-8524 Japan Department of Communication Engineering Faculty of Computer Science and Systems Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan

PID controllers have been widely used in many chemical processes. Because they have only three control parameters and their physical meanings can be easily grasped. However, it is difficult to tune those parameters practically, since the process dynamics often change due to operating conditions or various disturbances. For this problem, a design method of robust PID controllers has been already proposed by the authors in order to guarantee the stability of the control system. However, as that control method is conservative, the desirable setpoint response can not be always obtained. In this paper, a design scheme of a self-tuning pre-filter is proposed to supplement the robust PID controller based on the two-degree-of-freedom control scheme. According to the proposed scheme, the transient property for the setpoint response can be improved keeping the robust stability. Finally, the proposed scheme is experimentally evaluated on an air pressure control system.

关键词： Mechanics

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