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Journal of Systems engineering and Electronics 2005年第4期16卷 941-946页

作者： Liu Yu Qin Zheng Wang Xianghua He Xingshi Dept. of Computer Science Xi'an Jiaotong Univ. Xi'an 710049 P. R. China School of Software Tsinghua Univ Beijing 100084 P. R. China Dept. of Mathematics Xi'an Univ. of Engineering Science and Technology Xi'an 710048 P. R. China

The previous particle swarm optimizers lack direct mechanism to prevent particles beyond predefined search space, which results in invalid solutions in some special cases. A momentum factor is introduced into the original particle swarm optimizer to resolve this problem. Furthermore, in order to accelerate convergence, a new strategy about updating velocities is given. The resulting approach is mromentum-PSO which guarantees that particles are never beyond predefined search space without checking boundary in every iteration. In addition, linearly decreasing wight PSO （LDW-PSO） equipped with a boundary checking strategy is also discussed, which is denoted as LDWBC-PSO. LDW-PSO, LDWBC-PSO and momentum-PSO are compared in optimization on five test functions. The experimental results show that in some special cases LDW-PSO finds invalid solutions and LDWBC-PSO has poor performance, while momentum-PSO not only exhibits good performance but also reduces computational cost for updating velocities.

关键词： evolutionary computation particle swarm optimization optimization algorithm.

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Cost-based scheduling of scientific workflow applications on utility grids

Cost-based scheduling of scientific workflow applications on...

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1st International Conference on e-science and Grid Computing, e-science 2005

作者： Yu, Jia Buyya, Rajkumar Tham, Chen Khong Grid Computing and Distributed Systems Laboratory Dept. of Computer Science and Software Engineering University of Melbourne Vic. 3010 Australia Dept. of Electrical and Computer Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260 Singapore

ISBN: (纸本)0780394631

over the last few years, Grid technologies have progressed towards a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. Users consume these services based on their QoS (Quality of Service) requirements. In such "pay-per-use" Grids, workflow execution cost must be considered during scheduling based on users' QoS constraints. In this paper, we propose a cost-based workflow scheduling algorithm that minimizes execution cost while meeting the deadline for delivering results. It can also adapt to the delays of service executions by rescheduling unexecuted tasks. We also attempt to optimally solve the task scheduling problem in branches with several sequential tasks by modeling the branch as a Markov Decision Process and using the value iteration method. © 2005 IEEE.

关键词： Distributed computer systems

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Panel: Using peer review in teaching computing

Panel: Using peer review in teaching computing

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Proceedings of the Thirty-Sixth SIGCSE Technical Symposium on computer science Education, SIGCSE 2005

作者： Gehringer, Edward F. Chinn, Donald D. Ardis, Mark A. Pérez-Quinones, Manuel A. North Carolina State University Depts. of Computer Science and ECE Raleigh NC 27695-7256 Univ. of Washington at Tacoma Dept. of Computing and Software Systems Tacoma WA 98402 Rose-Hulman Institute of Technology Dept. of Computer Science and Software Engineering Terre Haute IN 47803 Department of Computer Science Virginia Tech Blacksburg VA 24061

ISBN: (纸本)1581139977

For generations, the academic community has relied on peer review as a way of encouraging scholarship and enhancing the knowledge base. Peer review has been widely used in the classroom since at least the 1970s, with hundreds of papers on its use in diverse academic fields appearing in the literature (for a comprehensive survey, see [1]). Its use appears to be on the upswing, given the current interest in active learning and teamwork. In computer science, peer review seems to have very broad application. It can be used to evaluate the contributions of various members to a project team;it can be used for design documents and code reviews, in writing assignments, and in capstone project courses. The experience of the panelists is illustrative of the wide range of peer-review practices. This panel will serve to introduce the audience to some of these applications. Since many computer-science instructors have experimented with peer review, we are anxious to have them share their experiences during the open discussion period.

关键词： computer science

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Hardware support: A cache lock mechanism without retry

Hardware support: A cache lock mechanism without retry

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6th International Conference on software engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing and 1st ACIS International Workshop on Self-Assembling Wireless Networks, SNPD/SAWN 2005

作者： Hong, Chuleui Park, Kyeongmo Song, Yeong-Tae Software School Sangmyung University Seoul Korea Republic of School of Computer Science and Information Engineering Catholic University Korea Republic of Dept. of Computer and Information Science Towson University MD United States

ISBN: (纸本)0769522947

A lock mechanism is essential for synchronization on the multiprocessor systems. The conventional queuing lock has two bus traffics that are the initial and retry of the lock-read This paper proposes the new locking protocol, called WPV (Waiting Processor Variable) lock mechanism, which has only one lock-read bus traffic command. The WPV mechanism accesses the shared data in the initial lock-read phase that is held in the pipelined protocol until the shared data is transferred. The WPV mechanism also uses the cache state lock mechanism to reduce the locking overhead and guarantees the FIFO lock operations in the multiple lock contentions. In this paper, we also derive the analytical model of WPV lock mechanism as well as conventional memory and cache queuing lock mechanisms. The simulation results on the WPV lock mechanism show that about 50% of access time is reduced comparing with the conventional queuing lock mechanism. © 2005 IEEE.

关键词： computer hardware

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BEHAVIORAL MODELS OVER RINGS MINIMAL REPRESENTATIONS AND APPLICATIONS TO CODING AND SEQUENCES

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IFAC Proceedings Volumes 2005年第1期38卷 1198-1203页

作者： Margreta Kuijper Xin-Wen Wu Udaya Parampalli Dept. of Electrical and Electronic Engineering Dept. of Computer Science and Software Engineering The University of Melbourne VIC 3010 Australia

In this paper we consider polynomial kernel representations for behaviors. For behaviors over fields it is well-known that minimal representations, i.e. representations with minimal row degrees, are exactly those representations for which the polynomial matrix is row reduced. In this paper we consider behaviors over a particular type of ring, namely ℤ p r , where p is a prime number and r is a positive integer. As a starting point in this investigation we focus on minimal partial realizations. These are equivalent to shortest linear recurrence relations. We present an algorithm that computes a parametrization of all shortest linear recurrence relations for a finite sequence in ℤ p r . For this we extend well-known techniques developed by Reeds and Sloane in the 80's with methods from the theory of behavioral modeling.

关键词： Behavior shortest linear recurrence relation systems over rings minimality minimal partial realization parametrization

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Configuration strategies for evolutionary testing

Configuration strategies for evolutionary testing

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29th Annual International computer software and Applications Conference, COMPSAC 2005

作者： Xiaoyuan, Xie Baowen, Xu Changhai, Nie Liang, Shi Lei, Xu Dept. of Computer Science and Engineering Southeast University 210096 Nanjing China Jiangsu Institute of Software Quality 210096 Nanjing China Computer School National University of Defense Technology 410073 Changsha China Key Laboratory of Software Engineering Wuhan University 430072 Wuhan China

ISBN: (纸本)0769522092

Evolutionary Testing (ET) is a kind of efficient method of automatically test case generation, ET uses a kind of meta-heuristic search technique, the Genetic Algorithm, to convert the task of test case generation into an optimal problem. Nowadays, ET has been widely researched in many areas, especially in the GA configuration problem. In this paper, we suggest two strategies for the Genetic Algorithm configuration, to improve the performance of ET. One is Annealing Genetic Algorithm (AGA), which alters the mutation probability dynamically, and the other is Restricted Genetic Algorithm (RGA), which adds restrictions into fitness functions. The two strategies made ET hit the global optimal solution in fewer generations, and most offspring genes located in the legal domain. © 2005 IEEE.

关键词： computer testing

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IT offshore outsourcing: Impact on CS/IS curriculum

IT offshore outsourcing: Impact on CS/IS curriculum

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Proceedings of the Thirty-Sixth SIGCSE Technical Symposium on computer science Education, SIGCSE 2005

作者： Ferguson, Ernest Henderson, Peter B. Huen, Wing Kussmaul, Clifton Dept. of Comp Science/Info Systems Northwest Missouri State University Maryville MO 64468-6001 Dept. of Computer Science and Software Engineering Butler University Indianapolis IN Dept. of Comp Science University of Wisconsin Oshkosh Oshkosh WI 54901-8643 Mathematical Sciences Dept. Muhlenberg College Allentown PA 18104-5586

ISBN: (纸本)1581139977

Almost all major news and professional publications document IT Offshoring & Outsourcing (O&O), which has caused job losses in the US and drops in computer science/information science (CS/IS) enrollment. Public opinion and understanding of O&o has several misconception such as non availability of onshore jobs in the CS/IT industry. To increase CS/IS enrollments students, parents, and administrators should be educated about the realities of IT job market. Various ways should be devised to increase student retention without decreasing standards, through more effective pedagogy and better student support.

关键词： Information technology

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An interactive distributed evolutionary algorithm (IDEA) for design

An interactive distributed evolutionary algorithm (IDEA) for...

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IEEE Systems, Man and Cybernetics Society, Proceedings - 2005 International Conference on Systems, Man and Cybernetics

作者： Dozier, Gerry Carnahan, Brian Seals, Cheryl Kuntz, Lois-Ann Fu, Ser-Geon Dept. of Computer Science and Software Engineering Auburn University Auburn AL 36849-5347 Dept. of Industrial Systems Engineering Auburn University Auburn AL 36849-5347 Dept. of Psychology University of Maine at Machias 9 O'Brien Avenue Machias ME 04654-1397

Evolutionary computation (EC) has been successfully applied to a wide range of design problems. There has also been an abundant amount of work in applying interactive ECs in the design of displays, robot behavior, bitmaps, etc. In the EC literature, one can also see a number of successful design applications of distributed ECs. However, to date, there has been no research in the area of interactive distributed ECs. In this paper, we present an interactive distributed evolutionary algorithm (IDEA) for the design of simple emoticons. We will discuss two ways that our IDEA is currently being used including the areas of EC education and Human Factors. © 2005 IEEE.

关键词： Evolutionary algorithms

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Evaluating indirect and direct classification techniques for network intrusion detection

Evaluating indirect and direct classification techniques for...

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作者： Khoshgoftaar, Taghi M. Gao, Kehan Ibrahim, Nawal H. Empirical Software Engineering Laboratory Dept. of Computer Science and Engineering Florida Atlantic University Boca Raton FL 33431 United States Department of Computer Science and Engineering Florida Atlantic University Boca Raton FL United States Math and Computer Science Department Eastern Connecticut State University CT 06226 United States

The network intrusion detection domain has seen increased research that exploit data mining and machine learning techniques and principles. Typically, multi-category classification models are built to classify network traffic instances either as normal or belonging to a specific attack category. While many existing works on data mining in intrusion detection have focused on applying direct classification methods, to our knowledge indirect classification techniques have not been investigated for intrusion detection. In contrast to indirect classification techniques, direct classification techniques generally extend associated binary classifiers to handle multi-category classification problems. An indirect classification technique decomposes (binarization) the original multi-category problem into multiple binary classification problems. The classification technique used to train the set of binary classification problems is called the {base} classifier. Subsequently, a combining strategy is used to merge the results of the binary classifiers. We investigate two binarization techniques and three combining strategies, yielding six indirect classification methods. This study presents a comprehensive comparative study of five direct classification methods with the thirty indirect classification models (six indirect classification models for each of the five base classifiers). To our knowledge, there are no existing works that evaluate as many indirect classification techniques and compare them with direct classification methods, particularly for network intrusion detection. A case study of the DARPA KDD-1999 offline intrusion detection project is used to evaluate the different techniques. It is empirically shown that certain indirect classification techniques yield better network intrusion detection models. © 2005-IOS Press and the authors. All rights reserved.

关键词： Intrusion detection

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Client authentication model using duplicated authentication server systems

Client authentication model using duplicated authentication ...

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13th International Conference on AIS 2004

作者： Lee, Jae-Woo Software System Lab. Dept. of Computer Science and Engineering Korea University 1 5-ka Anam-dong SungBuk-ku 136-701 Seoul Korea Republic of

In the Internet and distributed systems, we can always access many application servers for gaining many information or electronic business processing, etc. Despite of those advantages of information technology, there have been also many security problems that many unauthorized users attack our network and computer systems for acquiring many information or destroying our resources. In this paper, we propose a client authentication model that uses two authentication server systems, duplicated authentication. Before a client requests information processing to application web servers, the user acquire session password from two authentication servers. The proposed client authentication model can be used making high quality of computer security using the two authentication procedures, user's password and authentication password. The second password by two authentication servers is used in every request transaction without user's input because of storing to client's disc cache when a session is opened first. For more secure authentication we can close session between client and server if a request transaction is not created during a time interval. And then user will acquire authentication password again using logon to the authentication servers for requesting information processing. The client authentication procedure is needed to protect systems during user's transaction by using duplicated password system. And we can detect intrusion during authorized client's transaction using our two client authentication passwords because we can know immediately through stored client authentication password when a hackers attack our network or computer systems. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Security of data

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