检索结果-内蒙古大学图书馆

9th International Conference on communications systems, ICCS 2004

作者： Xie, Jing Jiang, Shengming Jiang, Yuming Institute for Infocomm Research 21 Heng Mui Keng Terrace Singapore119613 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Centre for Quantifiable Quality of Service in Communication Systems Norwegian University of Science and Technology Norway

ISBN: (纸本)0780385497

In an Ethernet Passive Optical Network (EPON), all optical network units (ONUs) share one uplink channel to transmit multiple traffic. To avoid data collision, a contention-free MAC protocol is needed to schedule the transmission order of different ONUs. An available solution is to assign a variable-sized time slot to each ONU. In this paper, we first review some existing bandwidth allocation schemes for EPON in the literature. Then we propose a novel scheme called dynamic weight priority scheduling (DWPS), which not only guarantees all ONUs fairly share the bandwidth of uplink channel on demand, but also supports differentiated services. To prevent one service class from monopolizing the bandwidth under heavy load, a bandwidth threshold determined by a weight ensures a minimum bandwidth for each traffic class. © 2004 IEEE.

关键词： Bandwidth

来源：评论

学校读者我要写书评

暂无评论

Utility-function based resource allocation for adaptable applications in dynamic, distributed real-time systems

Utility-function based resource allocation for adaptable app...

引用

International Symposium on Parallel and distributed Processing (IPDPS)

作者： F. Drews L. Welch D. Juedes D. Fleeman A. Bruening K. Ecker M. Hoefer Center for Intelligent Distributed and Dependable Systems School of Electrical Engineering and Computer Science Ohio University Athens OH USA Department of Computer Science Technical University of Clausthal-Zellerfeld Clausthal-Zellerfeld Germany

Summary form only given. We propose architecture and a general optimization framework for dynamic, distributed real-time systems. Interesting features of this model include the consideration of adaptive applications and utility functions. We extend by formalizing the corresponding multicriterial optimization problem. As the most difficult part of this problem, we identified the evaluation and comparison of the quality of single allocations and sets of allocations, respectively. To this end, we propose and examine metrics for measuring the goodness of solutions within our general resource management framework. These metrics lay the basis for further work on developing both online and offline algorithms to tackle the general optimization problem and provide an efficient adaptive resource manager for dynamic, distributed real-time systems.

关键词： Resource management Real time systems Application software computer science Space technology Geoscience Satellites Sensor arrays Middleware Degradation

来源：评论

学校读者我要写书评

暂无评论

Performance analysis of content matching intrusion detection systems

Performance analysis of content matching intrusion detection...

引用

Symposium on Applications and the Internet (SAINT)

作者： S. Antonatos K.G. Anagnostakis E.P. Markatos M. Polychronakis Institute of Computer Science Foundation for Research and Technology Hellas Heraklion Greece Distributed Systems Laboratory CIS Department University of Pennsylvania Philadelphia PA USA

Although network intrusion detection systems (nIDS) are widely used, there is limited understanding of how these systems perform in different settings and how they should be evaluated. This paper examines how nIDS performance is affected by traffic characteristics, rulesets, string matching algorithms and processor architecture. The analysis presented in this paper shows that nIDS performance is very sensitive to these factors. Evaluating a nIDS therefore requires careful consideration of a fairly extensive set of scenarios. Our results also highlight potential dangers with the use of workloads based on combining widely-available packet header traces with synthetic packet content as well as with the use of synthetic rulesets.

关键词： Performance analysis Intrusion detection Costs Telecommunication traffic computer security Algorithm design and analysis Traffic control computer science Laboratories Computational Intelligence Society

来源：评论

学校读者我要写书评

暂无评论

Generic Environment for Full Automation of Benchmarking 1

Generic Environment for Full Automation of Benchmarking

引用

Testing of Component-Based systems and Software Quality, 1st International Workshop on Software Quality, SOQUA 2004 and Workshop Testing Component-Based systems, TECOS 2004

作者： Kalibera, Tomáš Bulej, Lubomír Tůma, Petr Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Czech Academy of Sciences Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (纸本)3885793873

Regression testing is an important part of software quality assurance. We work to extend regression testing to include regression benchmarking, which applies benchmarking to detect regressions in performance. Given the specific requirements of regression benchmarking, many contemporary benchmarks are not directly usable in regression benchmarking. To overcome this, we present a case for designing a generic benchmarking environment that will facilitate the use of contemporary benchmarks in regression benchmarking, analyze the requirements and propose architecture of such an environment. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Benchmarking

来源：评论

学校读者我要写书评

暂无评论

ETAQA truncation models for the MAP/MAP/1 departure process

ETAQA truncation models for the MAP/MAP/1 departure process

引用

International Conference on the Quantitative Evaluation of systems (QEST)

作者： A. Heindl Q. Zhang E. Smirni Computer Networks and Communication Systems University of Erlangen Nuremberg Erlangen Germany Department of Computer Science College of William and Mary Williamsburg VA USA

We propose a family of finite approximations for the departure process of a MAP/MAP/1 queue. The departure process approximations are derived via an exact aggregate solution technique (called ETAQA) applied to quasi-birth-death processes (QBDs) and require only the computation of the frequently sparse fundamental-period matrix G. The approximations are indexed by a parameter n, which determines the size of the output model as n-1 QBD levels. The marginal distribution of the true departure process and the lag correlations of the interdeparture times up to lag n+1 are preserved exactly. Via experimentation we show the applicability of the proposed approximation in traffic-based decomposition of queueing networks and investigate how correlation propagates through tandem queues.

关键词： Traffic control Telecommunication traffic Design for quality Queueing analysis computer networks communication systems Autocorrelation computer science Educational institutions Aggregates

来源：评论

学校读者我要写书评

暂无评论

A replicated experiment of usage-based and checklist-based reading

A replicated experiment of usage-based and checklist-based r...

引用

International Symposium on Software Metrics

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

Software inspection is an effective method to detect faults in software artefacts. Several empirical studies have been performed on reading techniques, which are used in the individual preparation phase of software inspections. Besides new experiments, replications are needed to increase the body of knowledge in software inspections. We present a replication of an experiment, which compares usage-based and checklist-based reading. The results of the original experiment show that reviewers applying usage-based reading are more efficient and effective in detecting the most critical faults from a user's point of view than reviewers using checklist-based reading. We present the data of the replication together with the original experiment and compares the experiments. The main result of the replication is that it confirms the result of the original experiment. This replication strengthens the evidence that usage-based reading is an efficient reading technique.

关键词： Inspection Fault detection Testing communication system software computer science Software metrics Bioreactors Springs Software engineering

来源：评论

学校读者我要写书评

暂无评论

distributed knowledge by explanation networks

Distributed knowledge by explanation networks

引用

Annual Hawaii International Conference on System sciences (HICSS)

作者： Y. Waern R. Ramberg Department of Communication Studies Linköping University Linkoping Sweden Department of Computer and Systems Science Stockholm University and Royal Institute of Technology Kista Sweden

A knowledge based system may be considered as knowledge, distributed between one or several experts and the system users. Explanations in such a system provide for a more intensive interaction between the system and the user. We construct an explanation network by defining relationships between various knowledge fragments. Knowledge fragments on varying levels are formulated using the Qualitative Process Theory. The relationships are defined by links, compatible with Rhetorical Structure Theory. Different knowledge elements are combined into an explanation path by using Toulmin's argumentation theory. The feasibility of this approach is investigated. We show the following: By representing relations in a concept hierarchy as well as representing the relationships between elements in a rule of a knowledge base, both problem solving inferences and explanations can be generated. At the moment, the derivation of explanations cannot be performed automatically, but ready-made explanations may be stored and presented in a useful way. The explanation network idea has great knowledge acquisition power. An empirical study with users showed that different paths within the explanation net are useful for users with different prior knowledge. To conclude, the idea of distributing knowledge by support from an explanation network is fruitful and feasible.

关键词： Knowledge based systems Cognition Knowledge acquisition Information processing Intelligent systems computer networks distributed computing Problem-solving Labeling Writing

来源：评论

学校读者我要写书评

暂无评论

Dependability issues of pervasive computing in a healthcare environment

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

引用

Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 2802卷 53-70页

作者： Bohn, Jürgen Gärtner, Felix Vogt, Harald Department for Computer Science Distributed Systems Group CH-8092 Zürich Switzerland Departement de Systèmes de Communications Laboratoire de Programmation Distribuée CH-1015 Lausanne Switzerland

This paper proposes that the healthcare domain can serve as an archetypical field of research in pervasive computing. We present this area from a technological perspective, arguing that it provides a wide range of possible applications of pervasive computing technology. We further recognize that pervasive computing technology is likely to create concerns about the security of healthcare systems, due to increased data aggregation, ubiquitous access, and increasing dependency on technical solutions. But we also justify why the same technology can help building more robust, more dependable systems that increase the quality of healthcare. We identify building blocks that are necessary to achieve this goal: a pervasive middleware, appropriate handling of exceptional situations, and dependability assertions for small devices. © Springer-Verlag 2004.

关键词： Ubiquitous computing

来源：评论

学校读者我要写书评

暂无评论

Artificial neural network-based face recognition

Artificial neural network-based face recognition

引用

International Symposium on communications Control and Signal Processing (ISCCSP)

作者： A. Reda B. Aoued Evolutionary Engineering and Distributed Information Systems Laboratory EEDIS Computer Science Department University of Sidi-Bel Abbes Algeria Digital Signal processing laboratory Electronic Department University of Sidi-Bel Abbes Algeria

This document demonstrates how a face recognition system can be designed with artificial neural network. Note that the training process did not consist of a single call to a training function. Instead, the network was trained several times on various input ideal and noisy images, the images that contents faces. In this case training a network on different sets of noisy images forced the network to learn how to deal with noise, a common problem in the real world.

关键词： Artificial neural networks Face recognition Neural networks Neurons Face detection Image databases Laboratories Humans Design engineering distributed information systems

来源：评论

学校读者我要写书评

暂无评论

Impact of multiple frequency channels usage on the performance of TDMA-based broadband fixed cellular multihop networks

Impact of multiple frequency channels usage on the performan...

引用

IEEE Conference on Wireless communications and Networking

作者： I. Syed M.H. Ahmed H. Yanikomeroglu S. Mahmoud Broadband Communication and Wireless Systems Centre (BCWS) Department of Systems and Computer Engineering Carleton University Ottawa Canada Faculty of Engineering and Applied Science Memorial University Saint John's Canada

This work analyzes the impact of having more than one frequency channel on outage probability and node throughput in TDMA-based broadband fixed cellular multihop networks. The scenario considered is a low node density, start-up network with inadequate single-hop coverage. In this scenario the user terminals themselves act as relays, therefore, there are no additional relays deployed by the service provider: besides, no separate relaying channels are used (this scenario ensures a fair comparison between the multihop cellular network considered here and the traditional single-hop cellular network). In a situation where there is outage with a single-hop due to poor coverage, a suitable multihop route with minimum number of hops is sought. It is observed that as the number of available channels increases the coverage is enhanced remarkably; in addition, the average node throughput is increased as well although no explicit attempt for throughput maximization is made during the search for the multihop routes.

关键词： Frequency Cellular networks Spread spectrum communication Relays Land mobile radio cellular systems Throughput Mesh networks Base stations Wireless mesh networks Broadband communication

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：