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International Conference on Computing (CIC)

作者： Zhiming Dai Zhiyi Fang Xiao Han Fengyuan Xu Hongjun Yang School of Computer Science and Technology Key Laboratory Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University China School of Economics and Information Systems Jilin University China

In this paper, we introduce the condition of distributed computing at present firstly. On this foundation, according to the analysis of particular case of distributed computing network, we implement a distributed network environment of P2P whose bottom layer frame is based on JXTA. It improves issuing method of message based on pipeline decomposition mechanism of task based on usage ratio of processor and distributed mechanism of object based on serialization. We build an improved distributed computing network platform on the platform of Linux and Windows and simulate a distributed computing environment. The simulated experiment proves the feasibility and the validity of the distributed network computing platform that is constructed in this paper

关键词： Distributed computing Peer to peer computing Computer networks computational modeling Protocols Power generation economics Environmental economics Linux Large-scale systems Application software

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New Markov model used for path prediction over WLAN

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (engineering and Technology Edition) 2006年第SUPPL. 1期36卷 24-28页

作者： Yu, Xue-Gang Liu, Yan-Heng Wei, Da Tian, Ming Wang, Pin College of Computer Science and Technology Jilin University Changchun 130012 China Key Laboratory of Symbolic Computation and Knowledge Engineering Jilin University Changchun 130012 China Department of Mathematics Ocean University of China Qingdao 266003 China

In order to reduce the complexity of the state space in Order-k Markov predictor, a new Step-2 Markov predictor is proposed to make path prediction over WLAN. The feasibility of the Step-2 Markov predictor is proved by calculating and comparing conditional entropy of Step-2 and Order-k Markov predictors. And the paper also analyzes and compares the prediction accuracy of the two kinds of Markov predictors using actual Wi-Fi trace data. The work shows that the Step-2 Markov predictor is more stable than Order-1 Markov predictor for different length trace files and it also reduces the complexity of the Markov state space dramatically and gets approximately the same prediction accuracy with Order-2 Markov predictor and higher accuracy than Order-k (k≠2) Markov predictors.

关键词： Local area networks

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Approach to automated software design improvement

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Ruan Jian Xue Bao/Journal of Software 2006年第4期17卷 703-712页

作者： Feng, Tie Zhang, Jia-Chen Wang, Hong-Yuan Jin, Chun-Zhao Key Laboratory Symbolic Computation and Knowledge Engineering College of Computer Science and Technology Jilin University Changchun 130012 China

Object-Oriented software design improving technology is an effective means to increase system flexibility for adapting to future requirement variation and expansion. In this paper, a software design improving approach, based on micro-architecture anti-pattern and case based reasoning, is presented to improve software quality and maintainability. In this approach, problematic, inflexible structures and corresponding refactoring alternatives at micro-architecture level are formally defined and described as cases. Their organization and index mechanism in the case base are studied. Following the 4R procedures of CBR, similarity measurement methods on class diagrams, sequence diagrams, OO quality metric factors, and semantic constraints are discussed. Based on the measurement results, some algorithms on identifying anti-patterns instances in a given original design and replacing them by designs with high quality are presented. Furthermore, a supporting system CBDIT is developed to aid this approach.

关键词： Software engineering

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WDM: A New Efficient Visualization Method of Classifying Web Documents Based on SOM

WDM: A New Efficient Visualization Method of Classifying Web...

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International Conference on computational Intelligence and Security

作者： Xi Bai Jigui Sun Hong Luo College of Computer Science and Technology Jilin University Changchun China Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun China College of Information Science and Technology of Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)1424406048

We propose a new visualization method WDM to classify documents by adding in the position-factors of words such as the title-factor and the first-sentence-factor based on a SOM neural network. We also discuss the selection of the function which is used to calculate the belong-to-probability in neurons' reflecting process. The experimental results indicate that WDM makes the boundaries of different documents greatly more clear, and thus it can produce more accurate and intuitive classification compared to the visualization methods which do not have position-factors considered

关键词： Wavelength division multiplexing Visualization Neurons Neural networks Educational technology Educational institutions Computer science Sun Laboratories Computer networks

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Iterated fractal based on distance ratio

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Ruan Jian Xue Bao/Journal of Software 2006年第SUPPL.期17卷 70-77页

作者： Zhang, Xi-Zhe Lu, Tian-Yang Wang, Zheng-Xuan College of Computer Science and Technology Jilin University Changchun 130012 China Key Laboratory of Symbolic Computation and Knowledge Engineering Jilin University Changchun 130012 China Department of Computer Science and Technology Harbin Engineering University Harbin 150001 China

The escape time algorithm cannot render the convergence region of mapping, so there are some black regions in escape time fractal. In this paper, a novel method is presented to construct fractal image, which is named the distance ratio iteration method. This method performs iteration on two points and render fractal image by using their distance ratio convergence times. Taking complex mapping z←zα+c as example, the generalized Mandelbrot and Julia sets are constructed based on distance ratio and their visual properties are analyzed. The result fractal image has complex and self-similarity structure in inner convergence region. It is proved that the boundary of distance ratio fractal is the same as M-J set when α>0, and some visual structure of it with various exponent α are discussed. When α<0, the generalized Mandelbrot and Julia set based on distance ratio have some complex structures which M-J set does not have.

关键词： Computer graphics

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Existence and expression of osculatory rational interpolation

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Journal of Information and computational Science 2005年第3期2卷 493-500页

作者： Lei, Na Zhang, Shugong Dong, Tian Feng, Guochen Key Laboratory of Symbolic Computation and Knowledge Engineering Institute of Mathematics Jilin University Changchun 130012 China Key Laboratory of Mathematics Mechanization Chinese Academy of Sciences Beijing 100080 China

This paper deals with the problem of osculatory rational interpolation. We discuss the existence of the osculatory rational interpolation function for the given interpolation data and construct the relative rational function as it exists. Furthermore, we point out that the rational interpolation function exists for almost all given interpolation nodes and corresponding interpolation values. Finally some examples are presented.

关键词： Interpolation

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Applying model-transformation techniques to ontology evolution

Applying model-transformation techniques to ontology evoluti...

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2nd International Conference on Grid Service engineering and Management, GSEM 2005 - Co-located with the 6th International Conference on Net.ObjectDays 2005, NODe 2005

作者： Jin, Longfei Liu, Lei Guo, Degui Key Laboratory of Symbolic Computation Knowledge Engineering of Ministry of Education of China Jilin University Changchun China

ISBN: (纸本)3885793989

Ontology evolution in the Model Driven Semantic Web can be looked as a process of model transformations. A model-transformation based conceptual framework for ontology evolution is presented in the paper. Applications of model transformations in every phase of ontology evolution process are described. The framework combines technologies of ontology evolution, Ontology Definition Metamodel and model transformations, and it can be looked as a method for ontology evolution in the Model Driven Semantic Web.

关键词： Ontology

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A conditioned secure access control model based on multi-weighted roles in workflow system

A conditioned secure access control model based on multi-wei...

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5th International Conference on Control and Automation, ICCA'05

作者： Zhang, Jian Sun, Jigui Li, Niya Hu, Chengquan College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering Ministry of Education Jilin University China

ISBN: (纸本)0780391381

The traditional RBAC model already cannot express the complicated secure access control constraint of the workflow. Based on the traditional RBAC model, a new conditioned RBAC model named as CMWRBSAC is proposed on the basis of multi-weighted roles. A conditioned RBAC strategy is discussed on the basis of dynamic role assignment. A new concept of workflow access authorization is defined on the basis of roles with multi-weights, including the hierarchy weight, the degree weight and the sequence weight. Furthermore, in order to solve the problems of the sequence constraint of cooperative activating task by multi-roles and multi-users, a sort algorithm based on token and a sort algorithm based on weighted roles synthesis are presented respectively. Finally, an example is given to show the work processes of these algorithms. This model can express complicated workflow secure access control constraint. © 2005 IEEE.

关键词： Security systems

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A design of product configuration manager based on weight constraint parameter value in manufacture

A design of product configuration manager based on weight co...

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5th International Conference on Control and Automation, ICCA'05

作者： Li, Niya Liu, Dayou Zhang, Jian College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering Ministry of Education Jilin University China

ISBN: (纸本)0780391381

The configuration problem in manufacture is more complicated than most other fields. Therefore, the design of modeling and reasoning module for product configuration manager in manufacture is very important and complex. It is just what is mainly discussed in this paper. A framework of PCM in manufacture is put forward according to the Expert System theories, and a series of formalized knowledge representations and a data-driven graph control strategy for the PCM are provided. In the knowledge representations, the weight constraint is defined to distinguish the origins of the parameter value. It can be used to simplify the consistency check and effectivity check of the parameter. Furthermore, the search space of the configuration problem can be also easily compressed. The control strategy strengthens the real-time interaction between the user and the PCM so as to decompose the reasoning process. The reasoning process of the control strategy is described in detail by the configuration reasoning graph which is defined in this paper. © 2005 IEEE.

关键词： Flexible manufacturing systems

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A PKI-based lightweight workflow model

A PKI-based lightweight workflow model

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5th International Conference on Control and Automation, ICCA'05

作者： Zhang, Jian Sun, Jigui Li, Niya Hu, Chengquan Li, Zehai College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering Jilin University Ministry of Education China

ISBN: (纸本)0780391381

The workflow model is the abstract expression of the workflow or the business process. Following the WfMC reference model, a PKI-based lightweight workflow model named as PBLW is put forward in this paper. The framework of PBLW is proposed. Based on the time constraint directed graph, the workflow theory model in formalization is described in detail, and the time constraint problems are discussed in order to enhance the time management ability of the workflow model. Furthermore, in order to express the complicated secure access control constraint of the workflow, a conditioned RBAC model based on PKI technology is presented, according to the traditional RBAC security access control model. Finally, the workflow engine driven algorithms for the workflow instance are given. By the actual inspection and users' feedback, it proves that this model can express the basic requirements of a majority of the process applications. © 2005 IEEE.

关键词： Electronic document identification systems

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