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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Junfeng Wang Hongxia Zhou Fanjiang Xu Mingtian Zhou College of Computer Science and Engineering University of Electronic Science and Technology ChengDu China National Key Laboratory of Integrated Information System Technology Institute of Software Chinese Academy and Sciences Beijing China Chongqing Communication College Chongqing China

Low Earth orbit (LEO) satellite networks are capable of providing wireless connectivity seamlessly and continuously to any part of the world with guaranteed short round-trip propagation delay. As a key part of next generation network (NGN) infrastructure, next generation satellite networks are expected to support a variety of applications with diverse performance requirements. This paper argues that the constellation tomography for the LEO satellite network is a preliminary step for efficient satellite network monitoring and performance promotion. To measure the constellation, a divide-and-conquer mechanism is developed for each parameter estimation by delay probing. The delay measurement is only carried out between two terminals located at the same geographic positions. Performance evaluation on several popular polar LEO constellations proves the accuracy and efficiency of the developed constellation tomography algorithms in divide-and-conquer manner. The geographic position limitation of the delay probing terminals for valid constellation inference is also analyzed in the paper

关键词： Low earth orbit satellites Satellite constellations Extraterrestrial measurements Next generation networking Tomography Propagation delay Monitoring Parameter estimation Delay estimation Position measurement

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Topological dynamics characterization for layered satellite networks

Topological dynamics characterization for layered satellite ...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Junfeng Wang Yuemei Hu Hongxia Zhou Mingtian Zhou College of Computer Science and Engineering University of Electronic Science and Technology ChengDu China National Key Laboratory of Integrated Information System Technology Institute of Software Chinese Academy and Sciences Beijing China Chongqing Communication College Chongqing China

The highly topological dynamics characterize the most fundamental property of satellite networks contrary to the terrestrial networks. This manifest feature directs the researches on various aspects of satellite networks, including routing and switching architecture selection, routing protocol and reliable transmission control protocol design and enhancement, etc,. The paper quantifies the dynamical activates of layered satellite network topologies. The number and length of network snapshots of one-layered satellite constellations are formulated concisely. The snapshot distributions of typical multi-layered constellations are also evaluated. With this work, it compensates for the simplified topological assumptions in many satellite network related investigations. The thorough understanding of this basic feature not only provides for an accurate quantification of network behavior, but also guides constellation design for future satellite networks

关键词： Low earth orbit satellites Satellite broadcasting Satellite constellations Routing protocols Network topology Next generation networking Quality of service Laboratories information systems Communication system software

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Priority mapping algorithm without affecting the schedulability of tasks set

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Jisuanji Yanjiu yu Fazhan/computer Research and Development 2006年第6期43卷 1083-1089页

作者： Wang, Baojin Li, Mingshu Institute of Information and Engineering PLA Information and Engineering University Zhengzhou 450002 China Laboratory for Internet Software Technologies Institute of Software Chinese Academy of Sciences Beijing 100080 China Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China

In practice, the schedulability of static priority scheduling may be reduced if priority levels of the system are insufficient. When the priority levels that a task set requires are more than the system can support, more than one task must be assigned the same priority. The priority mapping algorithms that have been used can augment the worst-case response time of task with higher priority, and may reduce the system schedulability. If keeping system schedulable, these algorithms may require more priority levels than the system can support. With preemption threshold scheduling model, the schedulability is improved as compared to both preemption and non-preemption scheduling models, and all tasks can be handled with the minimum number of event handling threads. But, the number of system priority levels that a thread needs does not be reduced. This paper presents a priority mapping algorithm called TSM (threshold segment mapping) and a thread implementation architecture with event-driven. It is shown that the TSM algorithm can maintain the strict order of tasks' priorities, and does not improve task's worst-case response time. The number of system priority levels used by the algorithm and architecture equals to that of threads. Simulations show that when maintaining system schedulability, the TSM algorithm uses less priority levels than existing priority mapping algorithms.

关键词： Real time systems

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PUSHER REHEATING FURNACE CONTROL: A FUZZY-NEURAL MODEL PREDICTIVE STRATEGY

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IFAC Proceedings Volumes 2006年第19期39卷 165-170页

作者： Z.A. Icev M.J. Stankovski T.D. Kolemishevska J. Zhao G.M. Dimirovski SS Cyril and Methodius University Faculty of Electrical Engineering ASE Institute P.O.B. 574 MK-1000 Skopje Republic of Macedonia Northeastern University College of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China Dogus University Faculty of Engineering Computer Engineering Department Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Republic of Turkey

A design of fuzzy model-based predictive control for industrial furnaces has been derived and applied to the model of three-zone 25 MW RZS pusher furnace at Skopje Steelworks. The fuzzy-neural variant of Takagi-Sugeno fuzzy model, as an adaptive neuro-fuzzy implementation, is employed as a predictor in a predictive controller. In order to build the predictive controller the adaptation of the fuzzy model using dynamic process information is carried out. Optimization procedure employing a simplified gradient technique is used to calculate predictions of the future control actions.

关键词： Fuzzy-neural models fuzzy model predictive control optimization setpoint control time-delay processes

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Prediction Strategies for Proactive Management in Dynamic Distributed Systems

Prediction Strategies for Proactive Management in Dynamic Di...

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International Conference on Digital Telecommunications (ICDT)

作者： Jianguo Ding Xiaoyong Li Ningkang Jiang B.J. Kramer F. Davoli Software Engineering Institute East China Jiao Tong University Shanghai China School of Information Security Engineering Shanghai Jiaotong University Shanghai China Department of Electrical Engineering and Information Engineering Fern Universität Hagen Germany Department of Communications Computer and Systems Science DIST University of Genoa Genoa Italy

In real-life distributed systems, dynamic changes are unavoidable properties because of the degeneration or improvement in system performance. Hence to understand the dynamic changes and to "catch the trend" of the changes in distributed systems will be very important for distributed systems management. In order to model the dynamic changes in distributed systems, temporal extensions of Bayesian networks are employed to address the temporal factors and to model the dynamic changes of managed entities and the dependencies between them. Furthermore, the prediction capabilities are investigated by means of the relevant inference techniques when the imprecise and dynamic management information occurs in the distributed system

关键词： Bayesian methods information management Degradation software engineering information security Distributed computing System performance Condition monitoring Fault location Fault diagnosis

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A Linear Programming Approach for Ventilation Control in Tunnels

A Linear Programming Approach for Ventilation Control in Tun...

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IEEE Conference on Decision and Control

作者： Lukas Ferkl Gjerrit Meinsma Michael Sebek Institute of Information Theory and Automation Academy of Sciences슠of the슠Czech Republic Prague Czech Republic Faculty of Electrical Engineering Czech Technical University Prague Czech Republic Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands

ISBN: (纸本)1424401704;9781424401703

A control scheme for highway tunnels is designed based on a static model of a highway tunnel. The controller is designed to keep the exhaust levels inside the tunnel below given limits. During operation, the model is being modified by adaptation. The control itself is achieved by linear programming. Finally, an example of the control is given

关键词： Linear programming Ventilation Pollution measurement Fans Density measurement Fluid flow measurement Velocity measurement Road transportation Pistons Vehicles

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Multi-institutional teaching communities in computer education 06

Multi-institutional teaching communities in computer educati...

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ACM SIGCSE-SIGCUE Technical Symposium on computer science and Education

作者： Sally Fincher Raymond Lister Arnold Pears Judy Sheard Josh Tenenberg Alison Young Computing Laboratory University of Kent United Kingdom Faculty of Information Technology University of Technology Sydney Australia Dept of Information Technology Uppsala University Sweden School of Computer Science and Software Engineering Monash University Australia Computing and Software Systems Institute of Technology University of Washington United States of America Computing and Information Technology Unitec Auckland New Zealand

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Application of a Multi-Agent System (MAS) to Rational Credit Rating

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International Journal of Plant engineering and Management 2006年第4期11卷 234-241页

作者： YU Fan QIN Zheng LI Shi-ning E-commerce Institute School of Electronics and Information Xi＇an Jiaotong University Xi＇an 710049 P. R. China Software School Tsinghua University Beijing 100086 P. R. China Department of Computer Science and Engineering Northwest Polytechnical University Xi＇an 710072 P. R. China

A Multi-Agent System （ MAS ） is a promising approach to build complex system. This paper introduces the research of the Inner-Enterprise Credit Rating MAS （ IECRMAS）. To raise the rating accuracy, we not only consider the rating-target＇s information, but also focus on the evaluators＇ feature information and propose the rational rating-group formation algorithm based on an anti-bias measurement of the group. We also propose the rational rating individual, which consists of the evaluator and the assistant rating agent. A rational group formation protocol is designed to coordinate autonomous agents to perform the rating job.

关键词： multi-agent system rational group formation credit rating

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WISENT: e-science for Energy Meteorology

WISENT: e-Science for Energy Meteorology

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IEEE International Conference on e-science and Grid Computing

作者： Wilhelm Hasselbring Detlev Heinemann Johannes Hurka Thomas Scheidsteger Ludger Bischofs Christoph Mayer Jan Ploski Guido Scherp Sina Lohmann Carsten Hoyer-Klick Thilo Erbertseder Gerhard Gesell Marion Schroedter-Homscheidt Gerd Heilscher Jochen Rehwinkel Stefan Rensberg Software Engineering Group Department of Computer Science University of Oldenburg Oldenburg Germany EHF Laboratory Department of Physics University of Oldenburg Oldenburg Germany Business Information Management OFFIS-Institute for Computer Science Oldenburg Germany German AeroSpace Centre (DLR) Institute of Atmospheric Physics Wessling Germany German AeroSpace Centre (DLR) Institute of Technical Thermodynamics Stuttgart Germany German Remote Sensing Data Center (DFD) German Aerospace Center Wessling Germany Meteocontrol GmbH Augsburg Germany

ISBN: (纸本)9781424430116

Our energy production increasingly depends on renewable energy sources, which impose new challenges for distributed and decentralized systems. One problem is that the availability of renewable energy sources such as wind and solar is not continuous as it is affected by meteorological factors. The challenge is to develop forecast methods capable of determining the level of power generation in near real-time in order to control power plants for optimal energy production. Another scenario is the identification of optimal locations for such power plants. In our collaborative project, these tasks are investigated in the domain of energy meteorology. For that purpose large data sources from many different sensors (e.g., satellites and ground stations) are the base for complex computations. The idea is to parallelize these computations in order to obtain significant speedup. This paper reports on an ongoing project employing Grid technologies in that context. Our approach to processing large data sets from a variety of heterogeneous data sources as well as ideas for parallel and distributed computing in energy meteorology are presented. Preliminary experience with several Grid middleware systems in our application scenario is discussed.

关键词： Meteorology Renewable energy resources Power generation Production systems Meteorological factors Wind forecasting Weather forecasting Load forecasting Solar power generation Wind energy generation

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QoS benefit driven scheduling framework for middleware

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Ruan Jian Xue Bao/Journal of software 2006年第6期17卷 1381-1390页

作者： Zhang, Wen-Bo Chen, Ning-Jiang Wei, Jun Huang, Tao Technology Center of Software Engineering Institute of Software Chinese Academy of Sciences Beijing 100080 China Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China Graduate School Chinese Academy of Sciences Beijing 100049 China College of Computer Electronic and Information Guangxi University Nanning 530004 China

The first-come first-served scheduling framework adopted by most application servers has been proved to be inappropriate for dealing with unexpected overload for Internet-oriented Web applications. Considering the deficiency of the existing work from the architecture view, this paper presents a scheduling framework based on the notion of QoS benefits, which contains several cooperating components to guarantee the QoS requirements of the applications. The QoS benefits used to evaluate the QoS guarantee provided by the server according to the QoS requirements of the applications and the resource management based on the QoS benefits will help to provide a better QoS guarantee. Experimental results confirm the efforts on the OnceAS application Server.

关键词： Quality of service

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