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A user-oriented reliability modelling approach for web systems

International Journal of Web engineering and Technology 2007年第3期3卷 288-306页

作者： Wang, Wen-Li Hemminger, Thomas L. Tang, Mei-Huei School of Engineering Behrend College Erie Penn. State University Erie PA 16563 United States Computer and Information Science Department Gannon University Erie PA 16541 United States Programme of Electrical Computer and Software Engineering Pennsylvania State University Behrend College United States Pennsylvania State University Behrend College United States Computer and Information Science Department Gannon University United States

In this paper, we describe a user-oriented reliability model that addresses extensive web content, including many links, and that simultaneously addresses user dynamic navigation behaviour. Computation time is a problem in web systems because content can be tightly coupled. An alternative approach is to skip the consideration of the actual dynamic relationships but this is undesirable because the quality of a web system is bound to the success of a series of user navigations. These issues motivate our study from a user perspective. By parsing the logs, past navigations can be restored to form a flow graph. Our model adopts the idea of cyclomatic complexity to convert the graph to a maximum number of independent paths so that reliability can be computed by discounting the probabilities of unreliable paths. The application of this model can prioritise the fault removal sequence to assist in resource and effort allocation to improve reliability. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Web services

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A Method of Gene-Function Annotation Based on Variable Precision Rough Sets

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Journal of Bionic engineering 2007年第3期4卷 177-184页

作者： Zhi-li Pei Xiao-hu Shi Meng Niu Xu-ning Tang Li-sha Liu Ying Kong Yan-chun Liang College of Computer Science and Technology Jilin University Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education Changchun 130012 P. R. China College of Mathematics and Computer Science Inner Mongolia University for NationalitiesTongliao 028043 P. R. China College of Software Jilin University Changchun 130012 P. R. China Department of Biochemistry and Molecular Biology Institution of Glycobiology Dalian Medical University Dalian 116027 P. R. China

It is very important in the field of bioinformatics to apply computer to perform the function annotation for new sequenced bio-sequences. Based on GO database and BLAST program, a novel method for the function annotation of new biological sequences is presented by using the variable-precision rough set theory. The proposed method is applied to the real data in GO database to examine its effectiveness. Numerical results show that the proposed method has better precision, recall-rate and harmonic mean value compared with existing methods.

关键词： gene function annotation variable precision rough set GO BLAST

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A business process simulation environment based on workflow and multi-agent

A business process simulation environment based on workflow ...

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IEEE International Conference on Industrial engineering and engineering Management

作者： Haiyan Zhao Jian Cao College of Computer Engineering Shanghai University of Science and Technology Shanghai China Department of Computer Science& Engineering Shanghai Jiaotong University Shanghai China

ISBN: (纸本)9781424415281;1424415284

Simulation is an effective way to evaluate the performance of the business process model and it provides supports to process reengineering. But current business process simulation cannot model the complex factors and is lack of a distributed and extendable system framework. An integrated business process simulation environment based on workflow and multi-Agent is provided in this paper. In the environment, persons are modeled as agents, which can have individual complex properties and behaviors. At the same time, the enforcement of complex task assignment policies is simulated through a bidding process among agents. The system structure, key technologies together with the implementation are presented in the paper.

关键词： Business process re-engineering Engines Humans Discrete event simulation Computational modeling computer simulation Middleware Educational institutions computer science Paper technology

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Offset approximation algorithm for subdivision surfaces

Offset approximation algorithm for subdivision surfaces

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SNPD 2007: 8th ACIS International Conference on software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing

作者： Junqing, Yang Min, Zhou Xiaohong, An Lining, Zhang Department of Computer Engineering Xi'an Aerotechnical College Xi'an 710077 China College of Science Northwestern Polytechnical University Xi'an 710072 China Department of Software Engineering and Graphics Processing Department of Theory of Spline and Geometric Design Department of Theory of Subdivision and Geometric Design

ISBN: (纸本)0769529097

Based on Catmull-Clark Subdivision scheme, a valid algorithm of offset approximation for Subdivision Surface is proposed. It can overcome the defect that previous approaches treat offset surface only as parametric surface, functional surface and algebraic surface. In this paper, by making the limit positions corresponding to new control vertices of offset surface are at their exact offset positions, we convert offset approximation problem into solving linear equation system. We also present a method for error control of offset approximation, meanwhile, how to compute maximum offset distance without self-intersection is discussed. The examples in the paper demonstrate explicitness and efficiency of our method. © 2007 IEEE.

关键词： Surface analysis

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Geometric design of developable Bezier and B-spline parametric surfaces

Geometric design of developable Bezier and B-spline parametr...

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SNPD 2007: 8th ACIS International Conference on software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing

作者： Junqing, Yang Min, Zhou Quanyi, Lv Hongchan, Zheng Department of Computer Engineering Xi'an Aerotechnical College Xi'an 710077 China College of Science Northwestern Polytechnical University Xi'an 710072 China Department of Software Engineering and Graphics Processing Department of Theory of Spline and Geometric Design Department of Mathematics and Computation Department of Theory of Subdivision and Geometric Design

ISBN: (纸本)0769529097

Using the concept of duality between points and planes in 3D projective space, an explicit and efficient method of computer-aided design for developable surfaces based on Bezier and B-spline basis functions is proposed. By the result that a developable surface is the envelope of a single-parameter family of planes, we give the parametric equation of a Bezier and B-spline developable surface, and discuss respectively properties of Bezier and B-spline representations. Meanwhile, we also present a simplified geometric-construction for developable surfaces, that is, G2 Beta restraint condition algorithm for G2 continuity between two developable surfaces. It is shown that the geometric construction technique that exists for curves also can be generalized to the design of developable surfaces. © 2007 IEEE.

关键词： Computational geometry

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An improved Bayesian network structure learning algorithm and its application in an intelligent B2C portal

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Web Intelligence and Agent Systems 2007年第2期5卷 127-138页

作者： Ji, Junzhong Liu, Chunnian Yan, Jing Zhong, Ning College of Computer Science and Technology Beijing University of Technology Beijing Municipal Key Laboratory of Multimedia and Intelligent Software Technology Beijing 100022 China Department of Information Engineering Maebashi Institute of Technology 460-1 Kamisadori-Cho Maebashi-City 371-0816 Japan

Web Intelligence (WI) is a new and active research field in current AI and IT. Intelligent B2C Portals are an important research topic in WI. In this paper, we first investigate and analyze the architecture of a B2C portal for personalized recommendation from the viewpoint of conceptual levels of WI. Aiming at knowledge-level data mining in a B2C portal, we present a new improved learning algorithm of Bayesian Networks, which consists of two major contributions, namely, reducing Conditional Independence (CI) test costs by few lower order CI tests and accelerating search process by means of sort order for candidate parent nodes. Experimental results on benchmark ALARM data sets show that the improved algorithm has high accuracy, and is more efficient in the time performance than other algorithms. Finally, we apply this algorithm to learning Customer Shopping Model (CSM) in an intelligent recommendation system. By a number of experiments on real world data, we find that the recommendation method based on the learned CSM outperforms some traditional ones in rates of coverage and precision. © 2007 - IOS Press and the authors. All rights reserved.

关键词： Bayesian networks

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Application of event B to modelling multiagent interactions

Application of event B to modelling multiagent interactions

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ICICT 2007: International Conference on Information and Communication Technology

作者： Hongjiang, Gao Ying, He Zheng, Qin Liping, Shao Xingchen, Heng Department of Computer Science and Technology Xi'an JiaoTong University Xi'an 710049 China School of Computer Science and Technology Ludong University Yantai 264025 China School of Software Tsinghua University Beijing 100084 China Department of Electric Engineering Xinjiang Polytechnical College Urumqi 830091 China

ISBN: (纸本)9843233948

With increasingly complexity in MAS, rigorous design practices are needed in case of critical applications. Event B, which provides an accessible and rigorous formal approach to development of such complex system, is ideal for the formal modelling of reactive systems. In this paper we present a part of ongoing work in this area. A practical approach for developing flexible and reliable formal specifications of MAS using Event B is described, exemplified on Contract Net Protocol (CNP) in the interaction of MAS, associating an intelligent shape and style design systems in automobile.

关键词： Multi agent systems

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ECG and heart rate determination in fetal cattle using a digital signal processing method

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Animal science Journal 2008年第6期73卷

作者： Wenxi CHEN Tetsu NEMOTO Toshio KOBAYASHI Toshiyuki SAITO Etsuko KASUYA Yoshifumi HONDA Department of Computer Software University of Aizu Aizu-Wakamatsu-shi Medical College Kanazawa University Kanazawa-shi Faculty of Engineering Soka University Hachioji-shi National Institute of Agrobiological Sciences Kukizaki-machi Ibaraki-ken and National Institute of Livestock and Grassland Science Tsukuba Norin Kenkyu Danchi Ibaraki-ken Japan

A method of recording the fetal electrocardiogram (ECG) and heart rate (HR) is described. An abdominal lead and a thoracic lead were used to measure the fetal ECG and maternal ECG, respectively. The maternal component in the abdominal lead measurement was estimated by a digital adaptive filter using the thoracic lead measurement as a reference. By suppressing the estimated maternal components in the abdominal lead, the fetal ECG could be detected. The beat-by-beat fetal QRS complex peaks were determined by a digital matched filter from the fetal ECG enhanced in this way. The method was trialed in 10 pregnant Holstein cows at gestational periods ranging from 136 to 224 days. The results show that this method can extract the fetal ECG and determine the fetal HR from the raw noisy measurement data. The results suggest that the method would have applicability in monitoring fetal ECG as well as providing a non-invasive, continuous HR profile during gestation, which will enable better understanding of the development of cattle fetuses before delivery.

关键词： digital signal processing electrocardiogram fetal cattle heart rate pregnancy monitoring

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Mobile game development: Object-orientation or not

Mobile game development: Object-orientation or not

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31st Annual International computer software and Applications Conference, COMPSAC 2007

作者： Zhang, Weishan Han, Dong Kunz, Thomas Hansen, Klaus Marius School of Software Engineering Tongji University No. 1239 Siping Road Shanghai 200092 China Department of Computer Science Anhui Vocational College of Electronics and IT Anhui 233030 China Department of Systems and Computer Engineering Carleton University Ottawa K1S 5B6 Canada Computer Science Department University of Aarhus Aabogade 34 8200 Aarhus N Denmark

ISBN: (纸本)9780769528700

Mobile games are one of the primary entertainment applications at present. Limited by scarce resources, such as memory, CPU, input and output, etc, mobile game development is more difficult than desktop application development, with performance as one of the top critical requirements. As object-oriented technology is the prevalent programming paradigm, most of the current mobile games are developed with object-orientation (OO) technologies. Intuitively OO is not a perfect paradigm for embedded software. Questions remain such as how OO and to what degree OO will affect the performance, executable file size, and how optimization strategies can improve the qualities of mobile game software. These questions are investigated in this paper within the mobile Role-Playing-Game (RPG) domain using five industrial mobile games developed with OO. We analyzed them and found excessive usage of OO features used for the development of mobile device applications (but normal for usual desktop applications). We then apply some optimization strategies along the way of structural programming. The experiment shows that the total jar file size of these five optimized games decreases 71%, the lines of codes decreases 59%, and the loading time of each optimized game decreases 22.73%, 34.62%, 25.79%, 24.65% and 16.70% respectively. Therefore, we conclude from our experiments that OO should be used with great care in the development of mobile games, and that structural programming can be a very competitive alternative. © 2007 IEEE.

关键词： Object oriented programming

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From Limen to Lumen: Computing students in liminal spaces 07

From Limen to Lumen: Computing students in liminal spaces

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3rd International Computing Education Research Workshop, ICER'07

作者： Eckerdal, Anna McCartney, Robert Moström, Jan Erik Sanders, Kate Thomas, Lynda Zander, Carol Department of Information Technology Uppsala University Uppsala Sweden Department of Computer Science and Engineering University of Connecticut Storrs CT United States Department of Computing Science Umeå University 901 87 Umeå Sweden Mathematics and Computer Science Department Rhode Island College Providence RI United States Department of Computer Science University of Wales Aberystwyth Wales Computing and Software Systems University of Washington Bothell Bothell WA United States

ISBN: (纸本)9781595938411

This paper is part of an ongoing series of projects in which we are investigating "threshold concepts": concepts that, among other things, transforms the way a student looks as the discipline and are often troublesome to learn. The word "threshold" might imply that students cross the threshold in a single "aha" moment, but often they seem to take longer. Meyer and Land introduce the term "liminal space" for the transitional period between beginning to learn a concept and fully mastering it. Based on in-depth interviews with graduating seniors, we found that the liminal space can provide a useful metaphor for the concept learning process. In addition to observing the standard features of liminal spaces, we have identified some that may be specific to computing, specifically those relating to levels of abstraction. Copyright 2007 ACM.

关键词： Learning systems

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