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Attribute reduction in concept lattice based on discernibility matrix

10th International Conference on Rough Sets, Fuzzy Sets, Data Mining, and Granular Computing, RSFDGrC 2005

作者： Zhang, Wen-Xiu Wei, Ling Qi, Jian-Jun Faculty of Science Institute for Information and System Sciences Xi'an Jiaotong University Xi'an 710049 China Department of Mathematics Northwest University Xi'an 710069 China Institute of Computer Architecture and Network Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)3540286608

As an effective tool for knowledge discovery, concept lattice has been successfully applied to various fields. One of the key problems of knowledge discovery is knowledge reduction. This paper studies attribute reduction in concept lattice. Using the idea similar to Skowron and Rauszer's discernibility matrix, the discernibility matrix and function of a concept lattice are defined. Based on discernibility matrix, an approach to attribute reduction in concept lattice is presented, and the characteristics of core attribute are analyzed. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Knowledge based systems

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Evaluation of biological deployable systems

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International Journal of Space Structures 2005年第4期20卷 189-200页

作者： Hachem, Caroline Karni, Eyal Hanaor, Ariel Department of Building Engineering Faculty of Engineering and Computer Science Concordia 1515 Sainte-Catherine St W Montreal Qué. H3G2W1 Canada Faculty of Architecture and Town Planning Technion Haifa 32000 Israel National Building Research Institute Technion Haifa 32000 Israel

The paper presents a survey of deployable structural systems found in some biological organisms. Four biological systems are presented and analysed in terms of their morphology, kinematics and structural characteristics. This presentation is followed by an evaluation of the similarity of the biological systems with existing deployable structures and of potential applications. The four biological systems surveyed are two types of insect wings - Coleoptera (beetles) and locust;locomotion of the earthworm;and the jaw of the egg eater snake (Dasypeltis). These systems represent a diversity of deployable mechanisms. The paper concludes by associating the surveyed and other biological systems with known deployable structural systems such as: folded plates, tensioned membrane, pneumatic tubes (pneus) and structures composed of articulated rigid members.

关键词： Biological materials

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A study of secure communications between mobile objects

A study of secure communications between mobile objects

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IEEE International Conference on Engineering of Complex computer Systems

作者： Liao Zhigang Li Zengzhi Chen Yan Zhan Tao Institute of Computer Architecture & Network Xi''an Jiaotong University Xi'an China Computer science and technology Department Northwest Polytechnical University Xi'an China

JASIAC (Java-based Active-network Secure Inter Active Application Communication) provides a mechanism to solve the security problem for active application communication for active networks. JASIAC can work against "un-authorization access" and "masquerading" quite well and work efficiently with "malicious access " and "direct DoS attack". It stores the variables and methods to be published in a public variable pool and public method pool respectively, so it makes the security manageable and efficient; it also provides multilevel security mechanisms such as timed variable, hiding inner name, parameter by value and read-only parameter to make the security reliable and flexible.

关键词： Mobile communication Java Application software Security Authorization Fabrication Law Legal factors computer architecture computer science

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An inter-domain load balancing mechanism and performance evaluation

An inter-domain load balancing mechanism and performance eva...

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International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Jingguo Ge Hongwei Ma Hualin Qian Computer Network Information Center Chinese Academy and Sciences Beijing China Department of Computer Science & Engineering Shandong Institute of Architecture and Engineering Jinan China

ISBN: (纸本)0780390156

Load balancing technique may improve the performance and scalability of the Internet greatly. Many researchers focus on intra-domain load balancing which distributes traffic over multiple paths or server farms in a single domain. However, there is little research on interdomain (such as inter-AS or inter-PoP) load balancing due to the loose relationship and complex policies among domains. It is important to study inter-domain load balancing under the trend toward a denser mesh of inter-domain connectivity within the Internet. In this paper, we propose a distributed and dynamic load balancing mechanism using a hashing-based algorithm to distribute traffic between domains which preserves per-flow packet ordering and supports unequal weighted distribution when dynamic adaptation is used. We also evaluate the performance of the mechanism.

关键词： Load management Bandwidth Telecommunication traffic Routing protocols computer networks Internet Scalability IP networks Multiprotocol label switching Virtual private networks

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A real options methodology for evaluating risk and opportunity of natural ventilation

A real options methodology for evaluating risk and opportuni...

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Solar Engineering 2005

作者： Greden, Lara V. Lopez-Betanzos, Gabriel Glicksman, Leon R. Massachusetts Institute of Technology Building Technology Department of Architecture 77 Massachusetts Avenue Cambridge MA 02139 United States Massachusetts Institute of Technology Department of Computer Science and Electrical Engineering 77 Massachusetts Avenue Cambridge MA 02139 United States Massachusetts Institute of Technology Building Technology Departments of Architecture and Mechanical Engineering 77 Massachusetts Avenue Cambridge MA 02139 United States

The variable, uncertain nature of climate imposes risk in using solar and building technologies, such as natural ventilation (NV). To maximize the potential benefit from NV while reducing risk, a building could be designed for NV along with the "real option" to install mechanical cooling in the future, if needed. Traditional evaluation procedures use expected values, which fail to acknowledge the value of uncertainty when system performance is a non-linear function of the uncertain variable. A real options methodology is proposed to evaluate the flexible building design under climate uncertainty. A building energy simulation is used to obtain probability distributions of the cost savings of the option-based NV strategy and of the time when (if) the mechanical cooling system is installed. A simplified stochastic temperature generator is used, and it may be used to evaluate real options for other technologies sensitive to future climate. The results of a real options analysis provide information to project investors on a) the likelihood of exercising the option, and b) the improved financial value of the technology when implemented with a flexible strategy. Copyright © 2005 by ASME.

关键词： Risks

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Comparison of Crawling Strategies for an Optimized Mobile P2P architecture

Comparison of Crawling Strategies for an Optimized Mobile P2...

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The 19th International Teletraffic Congress-ITC19

作者： Tobias Hoβfeld Andreas Mder Kurt Tutschku Phuoc Tran-Gia Frank-Uwe Andersen Hermann de Meer Ivan Dedinski Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Siemens Communications Siemensdamm 62 13623 Berlin Germany Chair of Computer Networks and Computer Communications University of Passau Innstr. 33 94032 Passau Germany Chair of Computer Networks and Computer Communications University of Passau Innstr. 33 94032 Passau Germany

Mobile networks differ from their wireline counterparts mainly by the high costs for air transmissions and by the mobility of the users. A new entity, denoted as the crawling peer, is suggested in order to optimize the resource mediation mechanism for a mobile P2P file sharing application. The crawling peer locates content on behalf of mobile peers. It is placed in the wireline part of the mobile network and thus, does not suffer from the above mentioned restrictions. The crawling peer is part of a comprehensive mobile P2P file sharing architecture [1] which is based on the popular eDonkey file sharing application. The performance of three querying strategies of the crawling peer is investigated with respect to banning at the index servers and the response time of requests, i.e. the time to find a file. The results show that the selection of an appropriate request strategy for the crawling peer maximizes the probabihty of locating a file while the probability to be banned by an eDonkey index server is minimized.

关键词： P2P, mobile network architecture, resource mediation

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A new pointer-based instruction queue design and its power-performance evaluation

A new pointer-based instruction queue design and its power-p...

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IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： M.A. Ramirez A. Cristal A.V. Veidenbaum L. Villa M. Valero National Polytechnic Institute Mexicali Mexico Computer Architecture Department U. P. C Spain Spain Department of Computer Science University of California Irvine USA Mexican Petroleum Institute

Instruction queues consume a significant amount of power in a high-performance processor. The wakeup logic delay is also a critical timing parameter. This paper compares a commonly used CAM-based instruction queue organization with a new pointer-based design for delay and energy efficiency. A design and pre-layout of all critical structures in 70nm technology is performed for both organizations. The pointer-based design is shown to use 10 to 15 times less power than the CAM-based design, depending on queue size, for a 4-wide issue, 5GHz processor. The results also demonstrate the importance of evaluating all steps of instruction queue access: allocation, issue and wakeup rather than wakeup alone, especially for power consumption.

关键词： computer aided instruction

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Teaching to think in software terms: An interdisciplinary graduate software requirement Engineering course for AEC students

Teaching to think in software terms: An interdisciplinary gr...

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2005 ASCE International Conference on Computing in Civil Engineering

作者： Ozkaya, Ipek Akin, Orner Tomayko, James E. Carnegie Mellon University School of Architecture 5000 Forbes Av. MMCH 410 Pittsburgh PA 15213 Carnegie Mellon University Institute for Software Research International School of Computer Science 5000 Forbes Av. Wean 4614 Pittsburgh PA 15213

ISBN: (纸本)0784407940

Software is no longer developed and discussed only by computer science majors. Software development and engineering is a professional concentration area in architecture, engineering and construction (AEC) fields, among many others. Graduates of AEC related fields, who are motivated by problems which can be addressed better with computation or with better computation, often return to school to pursue graduate studies devoted to understanding computation of the professional problems they encounter. These students understand discipline specific issues in their fields well. However, in contrast to computer science majors, they lack techniques that can help them formulate solutions in software engineering terms. Asking such students to take classes from computer science curricula fosters interdisciplinary thinking;however, this practice fails to address the specialized computational needs of the AEC fields. An in depth understanding of how to use software development as a problem analysis approach can provide AEC students, both in the graduate and undergraduate levels, with problem classification techniques that they need. Here, we will describe our experience in introducing graduate AEC students to software requirement elicitation and development process techniques.

关键词： Software engineering

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Enhancing DNS security using the SSL trust infrastructure

Enhancing DNS security using the SSL trust infrastructure

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Workshop on Object-Oriented Real-Time Dependable Systems (WORDS)

作者： C. Fetzer G. Pfeifer T. Jim Department of Computer Science Institute for System Architecture Dresden University of Technology Dresden Germany AT and T Research Laboratories Florham Park NJ USA

The main functionality of the domain name system (DNS) is to translate symbolic names into IP addresses. Due to the criticality of DNS for the proper functioning of the Internet, many improvements have been proposed for DNS in terms of security and dependability. However, the current secure DNS (DNSSEC) standard has still several problems that need further consideration. For example, online updates and denial of service attacks are not sufficiently addressed. These problems are serious obstacles that might prevent DNSSEC from replacing the traditional DNS. In this paper we discuss several of these technical and economic problems. To address these issues, we propose a simple extension to the existing DNS. It is SSL based and individual domains can decide independently of each other if and when to adopt the extensions. We show how to implement these extensions with the help of a simple proxy DNS server.

关键词： Domain Name System computer crime Web server Data security computer science computer architecture Web and internet services Standards development Large-scale systems Delay

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Simulation-based verification method for SoC bus system

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2005年第10期17卷 2220-2226页

作者： Yue, Huawei Xu, Yongjun Zhang, Zhimin Yi, Bo Department of Physics University of Science and Technology of China Hefei 230026 China Computer Architecture Laboratory Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Information Network Laboratory Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China

We propose a simulation-based method in the verification of SoC bus system. By the method, constrained-random vector is used to make simulation first;then a coverage analysis is made in the simulation process until a certain coverage statistics is obtained. Finally, the test vector is manually generated. We use this method to verify a SoC system and get a satisfactory result by reducing the time of simulation effectively.

关键词： Bus system verification Coverage-analysis System on a chip

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