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Assessing usage patterns to improve data allocation via auctions

Assessing usage patterns to improve data allocation via auct...

引用

International Conference on MultiAgent Systems Proceedings

作者： R. Azoulay-Schwart S. Kraus Dept. of Math. & Comput. Sci. Bar-Ilan Univ. Ramat-Gan Israel Department of Mathematics and Computer Science Bar-llan University Ramat-Gan Israel Institute for Advanced Computer Studies University of Maryland College Park MD USA

The data allocation problem in incomplete information environments consisting of self-motivated severs responding to users' queries is considered. Periodically, the servers use auctions for allocation of new data items, and for reallocation of old data items. The utility of a server from storing a data item strongly depends on the usage of the item. However, each server has information only about the past usage of the data stored locally, but does not have information about the usage of data stored elsewhere. In this paper we propose that in order to improve the behaviour of the servers in the auctions, each server learns the expected usage of data items from information about past usage of its own data items. We implemented this type of learning process using neural networks. Simulations showed that our learning methods improve the results of the bidding mechanism, and they are better than the results obtained when learning via k-nearest neighbors algorithms.

关键词： Network servers NASA math.matics comput.r sci.nce Educational institutions Neural networks Learning systems Distributed information systems Knowledge based systems Information systems

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Lyapunov coupled equations for infinite jump linear systems

Lyapunov coupled equations for infinite jump linear systems

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IEEE Conference on Decision and Control

作者： M.D. Fragoso J. Baczynski Dept. of Syst. & Control Nat. Lab. for Sci. Comput. Petropolis Brazil Systems and Computing Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)0780366387

Deals with Lyapunov equations for continuous-time Markov jump linear systems (MJLS). We focus on the case in which the Markov chain has a countably infinite state space. It is shown that the infinite MJLS is stochastically stabilizable (SS) if and only if the associated countably infinite coupled Lyapunov equations have a unique norm bounded strictly positive solution. This result does not hold for mean square stabilizability (MSS), since SS and MSS are no longer equivalent in our set up. To some extent, tools from operator theory in Banach space and, in particular, from semigroup theory are the technical underpinning of the paper.

关键词： Equations Linear systems State-space methods Control systems Stability Stochastic systems Lifting equipment Roentgenium Vents Markov processes

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Immersive virtual reality for visualizing flow through an artery

Immersive virtual reality for visualizing flow through an ar...

引用

IEEE Conference on Visualization

作者： A.S. Forsberg D.H. Laidlaw A. Van Dam R.M. Kirby G.E. Kafniadakis J.L. Elion Dept. of Comput. Sci. Brown Univ. Providence RI USA Center for Fluid Mechanics Applied Math Brown University Providence RI USA Computer Science Brown University Providence RI USA

We present an immersive system for exploring numerically simulated flow data through a model of a coronary artery graft. This tightly-coupled interdisci.linary project is aimed at understanding how to reduce the failure rate of these grafts. The visualization system provides a mechanism for exploring the effect of changes to the geometry, to the flow, and for exploring potential sources of future lesions. The system uses gestural and voice interactions exclusively, moving away from more traditional windows/icons/menus/point-and-click (WIMP) interfaces. We present an example session using the system and discuss our experiences developing, testing, and using it. We describe some of the interaction and rendering techniques that we experimented with and describe their level of success. Our experience suggests that systems like this are exciting to clinical researchers, but conclusive evidence of their value is not yet available.

关键词： Virtual reality Visualization Arteries Numerical simulation Geometry Lesions Plasma simulation Heart Solid modeling Cardiology

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Routing in LEO-based satellite networks

Routing in LEO-based satellite networks

引用

1999 IEEE Emerging Technologies Symposium - Wireless Communications and Systems, ETWCS 1999

作者： Gounder, V.V. Prakash, R. Abu-Amara, H. Comput. Sci. Program Texas Univ. at Dallas RichardsonTX United States Comput. Sci. Program NORTEL Networks RichardsonTX United States

ISBN: (纸本)0780355547

Several strategies have been proposed for routing in a low Earth orbit (LEO) satellite system. Some of them are based on the Internet protocol (IP) and a few on asynchronous transfer mode (ATM) switching. However, issues like memory requirements of the satellites in the LEO network and the overheads involved in transmitting packets over the network have tended to be ignored. This paper focuses on developing an efficient solution to the routing issue in a LEO network. It also discusses the issue of the placement of the network operations and control centers (NOCC) required to support the satellite system. © 1999 IEEE.

关键词： Internet protocols

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Using a neural network to extract biological information from a jumping spider database 6

Using a neural network to extract biological information fro...

引用

6th International Conference on Neural Information Processing, ICONIP 1999

作者： Adams, A. Rienks, J. Dept. of Math. and Comput. Sci. Univ. of the South Pacific Suva Fiji Dept. of Biology Univ. of the South Pacific Suva Fiji

A backpropagation neural network has been used as a determining tool to extract relationships and qualitative information from a small database on the microhabitats and colour patterns of male and female jumping spide... 详细信息

ISBN: (纸本)0780358716

关键词： Neural networks

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Collapsing flow topology using area metrics 99

Collapsing flow topology using area metrics

引用

IEEE Conference on Visualization

作者： W. De Leeuw R. Van Liere Center for Math. & Comput. Sci. CWI Amsterdam Netherlands

ISBN: (纸本)078035897X

Visualization of topological information of a vector field can provide useful information on the structure of the field. However, in turbulent flows standard critical point visualization will result in a cluttered image which is difficult to interpret. This paper presents a technique for collapsing topologies. The governing idea is to classify the importance of the critical points in the topology. By only displaying the more important critical points, a simplified depiction of the topology can be provided. Flow consistency is maintained when collapsing the topology, resulting in a visualization which is consistent with the original topology. We apply the collapsing topology technique to a turbulent flow field.

关键词： Topology Data visualization comput.r graphics comput.tional modeling Analytical models Skin Friction Engine cylinders Joining processes Filters

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A formal model for the reuse of software specifications

A formal model for the reuse of software specifications

引用

Canadian Conference on Electrical and comput.r Engineering (CCECE)

作者： S.A. Ehikioya Dept. of Math. & Comput. Sci. Brandon Univ. Man. Canada

Numerous software specifications are hidden in large repositories in diffuse organizations. Often, new systems development projects contain parts that may have been previously specified, and systems designers are unable to easily detect the existence of such specifications thereby leading to duplication of efforts. So, an efficient system for finding and incorporating such specification components into new development efforts is desirable. We construct a software robot embedded with some intelligence to search specification repositories for reusable components based on the user's request. This model relies on fuzzy logic and set theory concepts to exploit the tolerance for imprecision and uncertainty to achieve tractability and robustness and low solution cost. This system offers some practical implications for systems developers by enabling the system designer to leverage development resources to the potential maximum and directly reap the benefits of component reusability.

关键词： Intelligent robots Robustness Costs Uncertainty Robot kinematics Fuzzy logic Software reusability Data mining Set theory Equations

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A characterization of information quality using fuzzy logic

A characterization of information quality using fuzzy logic

引用

Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： S.A. Ehikioya Dept. of Math. & Comput. Sci. Brandon Univ. Man. Canada

In this paper, we examine how to adequately engineer an information system that is guaranteed to produce high quality information. We also characterize the dimensions of information quality from the perspective of a systems designer. This relates directly with our view that information is an engineered product coming out of the information manufacturing processing system. Further, we integrate fuzzy sets/logic concepts into our model to facilitate the characterization of the continuum of information quality since information quality is highly contextual and dependent on the user.

关键词： Fuzzy logic Management information systems Information systems Decision making Systems engineering and theory Manufacturing processes Fuzzy sets Context modeling Robustness Uncertainty

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An agent-based system for distributed transactions: a model for Internet-based transactions

An agent-based system for distributed transactions: a model ...

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Canadian Conference on Electrical and comput.r Engineering (CCECE)

作者： S.A. Ehikioya Dept. of Math. & Comput. Sci. Brandon Univ. Man. Canada

We provide a model of a multiagent system for distributed transactions. We examine how to adequately capture concurrency and synchronization issues and use real-time programming techniques in modelling multiagent-based transaction applications. This paper provides problem-oriented abstraction mechanisms necessary to model database transaction systems in distributed multiagent-based environments using a framework that is both event-based and causally aware. The Web's inherent characteristics provide a natural and suitable problem domain environment for modelling and reasoning about distributed multiagent-based transactions.

关键词： Internet Business Electronic commerce Multiagent systems Transaction databases Prototypes Humans Data mining Concurrent comput.ng Web sites

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Integrated real time multi-channel wavelength monitoring circuit using phased-Array waveguide grating

Integrated real time multi-channel wavelength monitoring cir...

引用

1999 Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication, OFC/IOOC 1999

作者： Zhong, Shan Lee, Chau-Han Lin, Xiao Yang, Xiao-Hui Chen, Yung-Jui Stone, D. Dept. of Comput. Sci. and Electr. Eng. Maryland Univ. And Joint Program for Advanced Electronic Materials 1000 Hilltop Circle BaltimoreMD21250 United States

An integrated multichannel wavelength monitoring circuit using specially designed phased-Array waveguide grating and detector arrays, which monitors all wavelength-division multiplexing channels in real-Time (sixteen ... 详细信息

ISBN: (纸本)155752582X

关键词： Timing circuits

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