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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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Implementation of virtual factory using MMS companion standard

Implementation of virtual factory using MMS companion standa...

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IEEE International Workshop on Factory Communication systems (WFCS)

作者： Kwan-Joo Myoung Dong-Sung Kim Wook Hyun Kwon Engineering Research Center for Advanced Control Instrument Control Information Systems Laboratory School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

In this paper, a virtual factory using the manufacturing message specification (MMS) companion standard is implemented. The MMS companion standard (9506-3/spl sim/9506-7) and virtual machines are designed and implemented for robot, numerical controller (NC), programmable logic controller (PLC), and process control (PC). Finally, the MMS Internet monitoring system (MIMS) is developed for the testing system.

关键词： Production facilities Virtual manufacturing TCPIP Programmable control Virtual machining Condition monitoring Virtual machine monitors Manufacturing automation computer integrated manufacturing Control systems

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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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Optimal threshold energy level of energy efficient MAC for energy-limited ad-hoc networks

Optimal threshold energy level of energy efficient MAC for e...

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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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Differentially secure multicasting and its implementation methods

Differentially secure multicasting and its implementation me...

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International Conference on computer Communications and Networks (ICCCN)

作者： S. Holeman G. Manimaran J. Davis Dependable Computing & Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA Information Systems Security Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

Though the areas of secure multicast group architecture, key distribution and sender authentication are under scrutiny, one topic that has not been explored is how to integrate these with multilevel security. Multilevel security is the ability to distinguish subjects according to classification levels, which determines to what degree they can access confidential objects. In the case of groups, this means that some members can exchange messages at a higher sensitivity level than others. The Bell-La Padula model outlines the rules of these multilevel accesses (see Bell, D. and La Padula, L., MITRE Report, M74-244, MTR 2547 v2, 1973). In multicast groups that employ multilevel security, some of these rules are not desirable, so a modified set of rules is developed and is termed differential security. Also, this paper proposes three methods to set up a differentially secure multicast group: (1) naive approach, (2) multiple tree differential security (DiffSec) approach, and (3) single DiffSec tree approach. Our simulation studies show that both single and multiple DiffSec tree approaches offer similar performance in terms of bandwidth consumption, which is significantly better than that of the naive approach. We also discuss the suitability of the schemes, taking into account scalability and implementation issues.

关键词： Multilevel systems Security Cryptography computer networks Distributed computing Laboratories Bandwidth Scalability Multicast communication information systems

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A new adaptive routing scheme based on the traffic characteristics in mobile ad hoc networks

A new adaptive routing scheme based on the traffic character...

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IEEE Conference on Vehicular Technology (VTC)

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

We consider an ad hoc network that can form a flat or a hierarchical architecture. Basically all the mobile nodes form a flat network and some mobile nodes are able to be cluster heads, making mobility management easy. We define routing path establishment cost from a source node to a destination node and show the numerical results as the total number of mobile nodes increase in each ad hoc architecture. Through simulation we propose a new adaptive routing scheme based on the traffic characteristics in mobile ad hoc networks.

关键词： Telecommunication traffic Intelligent networks Mobile ad hoc networks Ad hoc networks Costs Routing protocols Mobile radio mobility management Mobile communication information systems computer architecture

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The adverse impact of the TCP congestion-control mechanism in heterogeneous computing systems

The adverse impact of the TCP congestion-control mechanism i...

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International Conference on Parallel Processing (ICPP)

作者： Wu-Chun Feng P. Tinnakornsrisuphap Computing Information and Communications Division Los Alamos National Laboratory Research and Development in Advanced Network Technology Los Alamos NM USA Department of Electrical & Computer Engineering University of Wisconsin Madison Madison WI USA

Via experimental study, we illustrate how TCP modulates application traffic in such a way as to adversely affect network performance in a heterogeneous computing system. Even when aggregate application traffic smooths out as more applications' traffic are multiplexed, TCP induces burstiness into the aggregate traffic load, and thus hurts network performance. This burstiness is particularly bad in TCP Reno, and even worse when RED gateways are employed. Based on the results of this experimental study, we then develop a stochastic model for TCP Reno to demonstrate how the burstiness in TCP Reno can be modeled.

关键词： Telecommunication traffic computer networks Aggregates Traffic control Peer to peer computing Concurrent computing Laboratories Application software IP networks Switches

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Distributed expertise for teaching computer organization & architecture 00

Distributed expertise for teaching computer organization & a...

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Working Group Reports from 5th Annual Conference on Innovation and Technology in computer Science Education, ITiCSE-WGR 2000

作者： Cassel, Lillian Boots Kumar, Deepak Bolding, Kevin Davies, Jim Holliday, Mark Impagliazzo, John Pearson, Murray Wolffe, Gregory S. Yurcik, William Department of Computing Sciences Villanova University VillanovaPA United States Department of Mathematics and Computer Science Bryn Mawr College Bryn MawrPA United States Department of Electrical Engineering Seattle Pacific University SeattleWA United States Computing Laboratory University of Oxford Oxford United Kingdom Department of Mathematics and Computer Science Western Carolina University CullowheeNC United States Department of Computer Science Hofstra University HempsteadNY United States Department of Computer Science University of Waikato Hamilton New Zealand Department of Computer Science and Information Systems Grand Valley State University AllendaleMI United States Department of Applied Computer Science Illinois State University NormalIL United States

ISBN: (纸本)9781450373586

This report presents preliminary results from our project on creating distributed expertise for teaching computer organization & architecture course(s) in the undergraduate computer science curriculum. We present the details of an online survey designed to gather information from faculty on the current state of teaching this course. The survey also tries to identify specific areas of need for creating distributed expertise as reported by various faculty. We also present several resources that have been identified that are available for use by faculty teaching the course(s). This report represents a mid-point of an ongoing two-year study. Following a discussion of the currently identified needs, we discuss ways to address them and conclude the report with a plan of action that will follow in the next phase of the project.

关键词： Teaching

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Preface

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2000年 1803卷 6-6页

作者： Cagnoni, Stefano Poli, Riccardo Li, Yun Smith, George Corne, David Oates, Martin Hart, Emma Lanzi, Pier Luca Boers, Egbert J. W. Paechter, Ben Fogarty, Terence C. University of Parma Department of Computer Engineering Parco delle Scienze 181/a Parma Italy The University of Birmingham School of Computer Science Edgbaston Birmingham United Kingdom University of Glasgow Electronics and Electrical Engineering Rankine Building Glasgow United Kingdom University of East Anglia Department of Information Systems Norwich United Kingdom University of Reading P.O. Box 225 Whiteknights Reading United Kingdom BT Labs at Adastral Park Dept. Complex Systems Laboratory Martlesham Heath Suffolk United Kingdom University of Edinburgh Division of Informatics 80 South Bridge Edinburgh United Kingdom Milan Polytechnic Department of Electronics and Informatics Piazza Leonard0 da Vinci 32 Milan Italy National Aerospace Laboratory NLR Data and Knowledge Systems Dept I.C.T. Division Anthony Fokkerweg 2 Amsterdam Netherlands Napier University School of Computing 219 Colinton Road Edinburgh United Kingdom South Bank University School of Computing Information Systems and Mathematics 103 Borough Road London United Kingdom

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Superconducting processors for HTMT: issues and challenges

Superconducting processors for HTMT: issues and challenges

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Frontiers of Massively Parallel Computation

作者： K.B. Theobald G.R. Gao T.L. Sterling Computer Architecture and Parallel Systems Laboratory Department of Electrical and Computer Engineering University of Delaware Newark DE USA NASA Jet Propulsion Laboratory /Center for Advanced Computing Research California Institute of Technology Pasadena CA USA

The Hybrid Technology Multi-Threading project is a long-term study of the feasibility of combining several emerging technologies to reach 1 petaFLOPS within ten years. HTMT will combine high-speed superconductor processors, semiconductor memories with built-in processors, high-speed optical interconnects, and high-density holographic storage. While there are major challenges in all aspects of this project, those in processor architecture are the focus of this paper. Fundamental differences between RSFQ circuits and conventional semiconductor circuits, including a radical jump in clock speed, make today's processor design approaches inappropriate for HTMT. Sequential instruction dispatching, even within the lowest programming unit (a strand), will lead to unacceptably high latencies, hence poor performance. We propose alternative processor designs which use fine-grain synchronizations between individual instructions in order to avoid these bottlenecks.

关键词： Random access memory Optical buffering Holography Holographic optical components Delay computer architecture Optical interconnections electrical capacitance tomography Quantum computing Clocks

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