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IEEE Annual International computer software and Applications Conference (COMPSAC)

作者： F.T. Sheldon K. Jerath Young-Jik Kwon Young-Wook Baik Software Engrng. for Dependable Systems Lab Sch. of Electrical Engrng. & Computer Science Washington State University Pullman USA School of Computer and Information Engineering Daejeon University South Korea

This paper presents a case study highlighting the best practices for designing and building a web-based auction system using UML (Unified Model Language) and component-based programming. We use the Use Case, Class, Sequence, and Component Diagrams offered by UML for designing the system. This enables new functions to be added and updated easily. Our implementation, with its basis in component-based programming, enabled us to develop a highly maintainable system with a number of reusable components: the Method of Bidding (the bidder can bid at three different frequencies-fast, medium or leisurely), the Certification (Identity verification function), and the Registration Good (Product entry function) Components. Further, the system uses intelligent agents that permit fair help to bidders participating in auctions and at the same time achieve maximum profit for the seller. The design and implementation environment, along with the tools used, provide excellent support for the successful development of the system.

关键词： computer aided software engineering Unified modeling language Object oriented modeling Consumer electronics Encapsulation computer science Design engineering Best practices Buildings Functional programming

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A Hybrid Genetic Algorithm for Reduct of Attributes in Decision System Based on Rough Set Theory

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Wuhan University Journal of Natural Sciences 2002年第3期7卷 285-289页

作者： Dai Jian\|hua 1,2 , Li Yuan\|xiang 1,2 ,Liu Qun 3 1. state key laboratory of software engineering, Wuhan University, Wuhan 430072, Hubei,China 2. school of computer, Wuhan University, Wuhan 430072, Hubei, China 3. school of computer Science, Wuhan University State Key Laboratory of Software Engineering Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Wuhan University School of Computer Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Chongqing University of Posts & Telecommunications School of Computer Science Chongqing China (GRID:grid.411587.e) (ISNI:***)

Knowledge reduction is an important issue when dealing with huge amounts of data. And it has been proved that computing the minimal reduct of decision system is NP-complete. By introducing heuristic information into genetic algorithm, we proposed a heuristic genetic algorithm. In the genetic algorithm, we constructed a new operator to maintaining the classification ability. The experiment shows that our algorithm is efficient and effective for minimal reduct, even for the special example that the simple heuristic algorithm can’t get the right result.

关键词： rough set reduction genetic algorithm heuristic algorithm

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Improving Chinese Storing Text Retrieval Systems' Security via a Novel Maximal Prefix Coding

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International Journal of computer Processing of Languages 2002年第4期15卷 379-393页

作者： D. Y. LONG W. J. JIA P. O. AU M. LI Department of Computer Science Zhongshan University Guangzhou 510275 PRC State Key Lab. of Information Security Chinese Academy of Science Beijing 100080 PRC Department of Computer Engineering and Information Technology City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR PRC School of Computing National University of Singapore Singapore

We have seen that Huffman coding has been widely used in data, image, and video compression. In this paper novel maximal prefix coding is introduced. Relationship between the Huffman coding and the optimal maximal prefix coding are discussed. We show that all Huffman coding schemes are optimal maximal prefix coding schemes and that conversely the optimal maximal prefix coding schemes need not be the Huffman coding schemes. Moreover, it is proven that, for any maximal prefix code C, there exists an information source I = (∑ P) such that C is exactly a Huffman code for I. Therefore, it is essential to show that the class of Huffman codes is coincident with one of the maximal prefix codes. A case study of data compression is also given. Comparing the Huffman coding, the maximal prefix coding is used not only for statistical modeling but also for dictionary methods. It is also good at applying to a large information retrieval system and improving its security.

关键词： Coding Data Compression Huffman Coding Maximal Prefix Coding

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Reliable message delivery for mobile agents: push or pull

Reliable message delivery for mobile agents: push or pull

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Jiannong Cao Xinyu Feng Jian Lu H. Chan S.K. Das Internet Computing and E-Commerce Lab Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong China State Key Laboratory for Novel Software Technology Department of Computer Science Nanjing University Nanjing China Center for Research Wireless Mobility and Networking (CrewMan) Department of Computer Science and Engineering University of Technology Arlington TX USA

Two of the fundamental issues in message passing between mobile agents are tracking the migration of the target agent and delivering messages to it. In order to provide reliable message delivery, protocols are needed to overcome message loss caused by asynchronous operations of agent migration and message forwarding. In this paper, two message forwarding approaches, namely push and pull, are explored to design adaptive and reliable message delivery protocols. The pros and cons of these two approaches are evaluated, both qualitatively and quantitatively. The comparative performance evaluation is in terms of network traffic and delay in message processing. We also propose improvements to the pull approach to reduce network traffic and the message delay. We conclude that with different communication and migration patterns and requirements of real-time message processing, specific applications can select different message delivery approaches to achieve the desired level of performance and flexibility.

关键词： Mobile agents Target tracking Mobile communication Protocols computer science Telecommunication traffic Communication system security Relays Internet laboratories

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New Refinement Relations of Z Specifications for Multiple Viewpoints Oriented Requirements Method

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 304-312页

作者： He Yan xiang, Song Qiang, Huang Qian school of computer, state key laboratory of software engineering Wuhan University, Wuhan 430072, China School of Computer State Key Laboratory of Software Engineering Wuhan University Wuhan China

In this paper we develop several new refinement relations of Z for multiple viewpoints oriented requirements method (MVORM). The original motivation is that we found the standard Z refinement relation is not adequate or correct when considering specifications that have temporal relationships of operations. The concept of temporal state variables is introduced into Z. Then new implementation relations are defined and new refinement relations are deduced, mainly for temporal state variables to process temporal relationships of operations. We use state transition systems to abstract the temporal state transitions. A simple example is used to show the procedures of MVORM. Finally some directions of further work are forwarded.

关键词： temporal state variable formal description language state transition system implementation relation refinement relation multiple viewpoints oriented requirements method

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Two Generic Frameworks of Multiple Viewpoints Oriented Requirements Method and Their Comparison

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 313-319页

作者： Song Qiang, He Yan xiang, Huang Qian school of computer Science, state key laboratory of software engineering, Wuhan University, Wuhan 430072, China School of Computer Science State Key Laboratory of Software Engineering Wuhan University Wuhan China

Traditional requirements method has some problems when it is used for large distributed systems. Multiple viewpoints oriented requirements method (MVORM) is a new method for resolving these problems. This paper develops two generic formal frameworks of MVORM, framework based on refinement relation (FBRR) and framework based on implementation relation (FBIR). They are generic, because no assumptions are made about the development process or the formal description languages to be used. Three kinds of specification relations and three kinds of specification transformations are discussed over FBIR and FBRR. This paper also compares the equivalence between FBIR and FBRR. We point out that an equivalent FBIR can be found for any FBRR, but reverse transformation is not always possible. We think FBIR is better than FBRR on most cases.

关键词： multiple viewpoints oriented requirements method framework based on refinement relation framework based on implementation relation refinement relation implementation relation

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Hierarchical Classification of Chinese Documents Based on N grams

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 416-422页

作者： Zhou Shui geng 1, Guan Ji hong 2, He Yan xiang 2 1. state key laboratory of software engineering, Wuhan University, Wuhan 430072, China 2. school of computer Science, Wuhan University, Wuhan 430072, China State Key Laboratory of Software Engineering Wuhan University Wuhan China School of Computer Science Wuhan University Wuhan China

We explore the techniques of utilizing N gram information to categorize Chinese text documents hierarchically so that the classifier can shake off the burden of large dictionaries and complex segmentation processing, and subsequently be domain and time independent. A hierarchical Chinese text classifier is implemented. Experimental results show that hierarchically classifying Chinese text documents based N grams can achieve satisfactory performance and outperforms the other traditional Chinese text classifiers.

关键词： Chinese text classification N grams feature selection hierarchical classification

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Role Modeling: A Modeling Method for software Pattern at Knowledge Level

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 200-203页

作者： Xu Yong\|song 1,He Ke qing 1,Ying Shi 2 1.school of computer, Wuhan University, Wuhan 430072, China 2.state key laboratory of software engineering, Wuhan University,Wuhan 430072, China School of Computer Wuhan University Wuhan China State Key Laboratory of Software Engineering Wuhan University Wuhan China

Based on dominant degree of role model among the viewpoints for object oriented modeling process, it dissertates that role modeling is a modeling method for software pattern at knowledge level. After giving some examples for modeling design pattern and analysis pattern at knowledge level using role model, it presents a process for refining design pattern from role model to class model and event trace diagram of UML. In this paper, we advocate the opinion that role modeling before object modeling of UML.

关键词： object oriented role modeling software pattern UML

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Code Component Composition Reuse Is a New Programming Paradigm

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 292-297页

作者： Ying Shi 1,Yuan Sheng Qiong 1,Xu Gang 1,He Ke Qing 2 1.state key laboratory of software engineering, Wuhan University, Wuhan 430072, China 2.school of computer Science and Technology, Wuhan University, Wuhan 430072, China State Key Laboratory of Software Engineering Wuhan University Wuhan China School of Computer Science and Technology Wuhan University Wuhan China

After describing the characteristics of programming paradigm, this paper introduces the approach of code component composition reuse in detail, proposes and discusses viewpoint that code component composition reuse is a kind of new programming paradigm. This paper also specifies the characteristics of this new programming paradigm in detail, and points out some issues that must be resolved for using this new programming paradigm.

关键词： programming paradigm code component code component composition reuse

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A Design Method of Business Application Framework Based on software Patterns

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 204-208页

作者： He Ke\|qing 1, Yang Chun wen 1, Ying Shi 2 1. school of computer Science, Wuhan University, Wuhan 430072, China 2. state key laboratory of software engineering, Wuhan University, Wuhan 430072, China School of Computer Science Wuhan University Wuhan China State Key Laboratory of Software Engineering Wuhan University Wuhan China

This paper discusses design and implementation method of Business Application Framework based on software patterns, and then presents MVC pattern of architecture and the method of dynamical update promulgation for Business Application Framework. We discuss adaptation of Abstract Factory for the kernel functionality of Business Application Framework, such as data creation, manipulation, composition, etc. It also presents class model and its class structure of Abstract Factory pattern. Finally, we briefly discuss the update, modification, and reconstruction method of Business Application Framework.

关键词： object oriented MVC pattern Abstract Factory pattern software framework UML role model

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