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5th IEEE International Conference on High Speed Networks and Multimedia communications, HSNMC 2002

作者： Han, Moon Seog Im, Seong Bin Eom, Young Ik Department of Administration and Computer Science Wonju National San 2-1 HeungUp-Ri HeungUp-Myun Wonju-Si KangWon-do Korea Republic of LogicForce Inc. 724 Suseo-Dong Kangnam-Gu Seoul-Si Korea Republic of Distributed Systems Lab. School of Information and Communication Engineering Sungkyunkwan University 300 ChunChun-Dong JangAn-Gu Suwon-Si KyungKi-Do Korea Republic of

ISBN: (纸本)0780376005

Research activities for combining portable computer technology and wireless communication technology are in progress to realize mobile computing environments. Among the various strategies necessary for mobile computing environments, the location management strategies are particularly emphasized especially for PCN environments. Location management strategy-for PCN environments, which is mostly based on the IS-41 standards, brings an issue that additional network traffic are generated to deliver update messages to the home location server whenever a mobile host changes its location server. We propose an innovative update strategy and a search strategy that resolves the problem shown in the IS-41 scheme. Also, this paper compares the performance of the proposed scheme with the IS-41-based scheme. © 2002 IEEE.

关键词： Location

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Working set based location management scheme for mobile computing environments

Working set based location management scheme for mobile comp...

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IEEE International Conference on High Speed Networks and Multimedia communications

作者： Moon Seog Han Seong Bin Im Young Ik Eom Department of Administration and Computer Science Wonju National Wonju Gangwon South Korea LogicForce Inc. Seoul South Korea Distributed Systems Laboratory School of Information and Communication Engineering Sungkyunkwan University Suwon Gyeonggi South Korea

关键词： Environmental management Mobile computing Portable computers Personal communication networks communications technology computer networks Frequency distributed computing Mobile communication Wireless communication

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How much information is needed for usage-based reading? A series of experiments

How much information is needed for usage-based reading? A se...

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International Symposium on Empirical Software Engineering (ISESE)

作者： T. Thelin P. Runeson C. Wohlin T. Olsson C. Andersson Department of Communication Systems Lund University Lund Sweden Department of Software Engineering and Computer Science Blekinge Institute of Technology Ronneby Sweden

Software inspections are regarded as an important technique to detect faults throughout the software development process. The individual preparation phase of software inspections has enlarged its focus from only comprehension to also include fault searching. Hence, reading techniques to support the reviewers on fault detection are needed. Usage-based reading (UBR) is a reading technique, which focuses on the important parts of a software document by using prioritized use cases. This paper presents a series of three UBR experiments on design specifications, with focus on the third. The first experiment evaluates the prioritization of UBR and the second compares UBR against checklist-based reading. The third experiment investigates the amount of information needed in the use cases and whether a more active approach helps the reviewers to detect more faults. The third study was conducted at two different places with a total of 82 subjects. The general result from the experiments is that UBR works as intended and is efficient as well as effective in guiding reviewers during the preparation phase of software inspections. Furthermore, the results indicate that use cases developed in advance are preferable compared to developing them as part of the preparation phase of the inspection.

关键词： Inspection Software engineering Bioreactors communication system software computer science Technology planning Fault detection Testing Engineering management

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Hybrid access scheme based on one phase preamble and channel monitoring/allocation for satellite Internet communications

Hybrid access scheme based on one phase preamble and channel...

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IEEE Conference on Vehicular Technology (VTC)

作者： Hyun-Ho Choi Sun-Ho Lee Dong-Ho Cho Communication and Information Systems Laboratory Department of Electrical Engineering& Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

The access scheme is required to have fast access and reliable transmission in satellite communications because of the long propagation delay and different channel characteristics. In this paper we propose a hybrid access scheme based on one phase preamble and channel monitoring/allocation for satellite communications. For fast access, we use an access scheme of 3GPP2 using one phase preamble instead of 3GPP using two phase preambles, and for more reliable transmission, the CM/CA scheme of 3GPP is applied. We investigate the performance of these proposed schemes through simulation. According to the simulation results, we could improve the random access scheme and could support smaller delay in satellite environments.

关键词： Base stations Principal component analysis Satellite communication Probes computerized monitoring Propagation delay Artificial satellites Internet Information systems computer science

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On-line admission control and packet scheduling with interleaving

On-line admission control and packet scheduling with interle...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and communications Societies

作者： J.A. Garay J.S. Naor B. Yener Peng Zhao Bell Laboratories Lucent Technologies Murray Hill NJ USA Computer Science Dept. Technion Haifa Israel Department of Computer Science Bogazici University Istan-bul Turkey Department of Communication System Lausanne Switzerland Department of Communication Systems EPFL Lausanne Switzerland

This paper presents a comprehensive study of the effect of job interleaving by preemption on the throughput of a single server where requests arrive with a given processing time and slack. The problem is to decide which requests to serve so as to maximize the server's utilization. This simple model captures many situations, both at the application (e.g., delivery of video) as well as at the network/transmission levels (e.g., scheduling of packets from input to output interface of a switch). The problem is on-line in nature, and thus we use competitive analysis for measuring the performance of our scheduling algorithms. We consider two modes of operation - with and without commitment - and derive upper and lower bounds for each case. Since competitive analysis is based on the worst-case scenario, the average-case performance of the algorithms is also examined by a simulation study.

关键词： Admission control Scheduling algorithm Interleaved codes Network servers Switches Performance analysis Algorithm design and analysis Throughput Packet switching Analytical models

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Data memory design considering effective bitwidth for low-energy embedded systems

Data memory design considering effective bitwidth for low-en...

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International Symposium on System Synthesis

作者： Y. Cao H. Tomiyama T. Okuma H. Yasuura Department of Computer Science and Communication Engeering Kyushu University Fukuoka Japan Institute of Systems & Information Technologies Kyushu Institute of Technology Fukuoka Japan

This paper presents a novel low-energy memory design technique, considering effective bitwidth of variables for application-specific systems, called VAbM technique. It targets the exploitation of both data locality and effective bitwidth of variables to reduce energy consumed by redundant bits. Under constraints of the number of memory banks, the VAbM technique uses variable analysis results to perform allocating and assigning on-chip RAM into multiple memory banks, which have different size with different number of word lines and different number of bit lines tailored to each application requirements. Experimental results with several real embedded applications demonstrate significant energy reduction up to 64.8% over monolithic memory, and 18.4% over memory designed by banking technique.

关键词： Embedded system Random access memory Application software Energy consumption Read-write memory Algorithm design and analysis System-on-a-chip Permission computer science Information technology

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Community informatics 35

Community informatics

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35th Annual Hawaii International Conference on System sciences, HICSS 2002

作者： Harris, R. Vogel, D. Bieber, M. Taylor, W. Gurstein, Michael Faculty of Information Technology Universiti Malaysia Sarawak Kota SamarahanSarawak Malaysia Dept. of Information Systems City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong Computer and Information Science Department New Jersey Institute of Technology Information Technology Center University Heights NewarkNJ United States Faculty of Informatics and Communication Central Queensland University RockhamptonQLD Australia

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Lower and upper bounds for tracking mobile users

IFIP Advances in Information and Communication Technology

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IFIP Advances in Information and communication Technology 2002年 96卷 47-58页

作者： Bespamyatnikh, Sergei Bhattacharya, Binay Kirkpatrick, David Segal, Michael Department of Computer Science Duke University Box 90129 Durham NC 27708 United States School of Computing Science Simon Fraser University Burnaby BC V5A 1S6 Canada Department of Computer Science University of British Columbia Vancouver BC V6T 1ZA Canada Communication Systems Engineering Department Ben-Gurion University of the Negev Beer-Sheva 84105 Israel

ISBN: (纸本)9781475752755

In this paper we prove improved lower and upper bounds for the location of mobile facilities (in L∞ and L2 metrics) under the motion of clients when facility moves faster than clients. This paper continues the research started in our joint paper where we present lower bounds and efficient algorithms for exact and approximate maintenance of the 1-center for a set of moving points in the plane. Our algorithms are based on the kinetic framework introduced by Basch, Guibas and Hershberger.

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Effective way to improve the response time of short term bursty TCP traffic

Effective way to improve the response time of short term bur...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yu-Chul Kim Jung-Sung Kwan Min-Kyo In Yong-Jin Kim Dong-Ho Cho Communication and Information Systems Laboratory Department of Electrical Engineering& Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Next Generation Intemet Standards Team Electronics and Telecommunications Research Institute ETRI Protowl Engineering Center Daejeon South Korea

In this paper, we propose a new algorithm that aids the recovery of lost packets by generating additional duplicate ACK. It is shown that by adopting this algorithm the response time and throughput of short term burst... 详细信息

关键词： Delay Degradation Telecommunication traffic Information systems computer science Telecommunication standards Bit error rate Wire Filters TCPIP

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Information dissemination in multihop inter-vehicle networks

Information dissemination in multihop inter-vehicle networks

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International Conference on Intelligent Transportation

作者： T. Kosch C. Schwingenschlogl Li Ai BMW Research Department Munich Germany Department of Computer Science applied Informatics Cooperative Systems Group Munich University of Technology Germany Department of Electrical Engineering and Information Technology Institute of Communication Networks Munich University of Technology Germany Department of Electrical Engineering and Information Technology Munich University of Technology Germany

In addition to the integration of vehicles into traditional networks (e.g. access to the Internet via cellular) the Ad-hoc connection of vehicles within a limited area is a technology that promises a lot of innovative and exciting services. This paper starts with the description of some services to motivate Ad-hoc networking in the vehicular environment. It then gives an overview of the current challenges (especially routing protocols) in this field. If the geographic position of the network nodes is known, better performance can be achieved with the utilization of so called geocast routing-algorithms. An overview of geocast-routing is given and shortcomings of the existing protocols for the usage in inter-vehicle Ad-hoc networks are explained. Finally we make a proposal for a vehicle-optimized geocast routing, protocol that is based on AODV and present our prototype implementation.

关键词： Intelligent networks Spread spectrum communication Routing protocols Vehicles Mobile communication Testing IP networks Data communication Wireless LAN Broadcasting

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