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Eurographics UK Conference

作者： R. Paffenroth D. Vrajitoru Applied and Computational Mathematics California Institute of Technology California USA Computer and Information Sciences Indiana University at South Bend Indiana USA

This article outlines the capabilities of a scientific visualization toolkit called Data Viewer and compares it to analogous software. DataViewer was originally designed for the construction of the visualization part of certain computational steering packages, and consequently it is particularly straightforward to closely couple DataViewer with numerical calculations. Rendering is performed through a highlevel scene graph which facilitates the easy construction of complex visualizations. Data Viewer differs from other such libraries by allowing complex geometrical objects, which efficiently encapsulate large amounts of data, to be used as. nodes in the scene graph. Graphics hardware access is through the OpenGL API.

关键词： Layout Data visualization Rendering (computer graphics) Software packages Packaging Graphics Software libraries mathematics Software tools Hardware

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On Proposing Statecharts to Specify Performance Models

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International Transactions in Operational Research 2002年第3期9卷 321-336页

作者： Vijaykumar, Nandamudi Lankalapalli Carvalho, Solon Venancio de Abdurahiman, Vakulathil Laboratory of Computing and Applied Mathematics National Institute for Space Research Brazil Department of Computer Science Aeronautical Institute of Technology Brazil

This paper shows that Statecharts, a high-level specification technique, can be used to represent performance models. This is a powerful technique and is based on state-transition diagrams added with concepts of hierarchy and orthogonality to represent a system behavior. It is shown that Statecharts may conveniently be used to represent models with richness and clarity. Using an analytical approach the technique to determine performance measurements is provided. Three examples are presented and the results show Statecharts’ potential for representing systems for performance evaluation. International Federation of Operational Research Societies 2002.

关键词： Markov chain Performance models Reactive systems Specification Statecharts

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A pragmatic approach for service provisioning based on a small set of per-hop behaviors

A pragmatic approach for service provisioning based on a sma...

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International Conference on computer Communications and Networks (ICCCN)

作者： V. Sander M. Fidler Central Institute for Applied Mathematics Forschungszentrum Jülich GmbH Julich Germany Department of Computer Science RWTH Aachen University of Technology Aachen Germany

In this paper we describe the implementation of a network providing advanced services such as a Premium service that aims at providing low loss, low delay, and low delay jitter and an Olympic service that allows for a service differentiation in terms of delay within three additional classes. Our implementation of this network is based on the Differentiated Services Architecture, which is the most recent approach of the Internet Engineering Task Force towards quality of service. Access to service classes is controlled by a bandwidth broker, which can perform traffic engineering by means of multiprotocol label switching. The Premium service is implemented as expedited forwarding and the Olympic service as a group of assured forwarding per-hop-behavior. We present a thorough evaluation of the proposed services implemented by the careful assignment of micro-flows to a small set of per-hop behaviors.

关键词： Multiprotocol label switching Bandwidth Aggregates IP networks Web and internet services Quality of service Delay Telecommunication traffic Tellurium Transport protocols

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Acoustic scattering on arbitrary manifold surfaces

Acoustic scattering on arbitrary manifold surfaces

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Geometric Modeling and Processing

作者： C. Bajaj Guoliang Xu J. Warren Department of Computer Sciences and Texas Institute of Computational and Applied Mathematics University of Technology Austin TX USA Institute of Computational Mathematics and Scientic/Engineering Computing Chinese Academy and Sciences Beijing China Department of Computer Sciene Rice University Houston TX USA

We propose the use of surface subdivision as adaptive and higher-order boundary elements for solving a Helmholtz partial differential equation to calculate accurate acoustic scattering on arbitrary manifolds. Such acoustic transfer functions prove useful for designing and tuning hearing aid devices for hearing impaired individuals. The number of unknowns of the discretized linear system is the same as that in a linear element approach. Our results show that the accuracy of the subdivision approach is much better than that of the linear element approach.

关键词： Acoustic scattering Solid modeling

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A rough set approach to measuring information granules

A rough set approach to measuring information granules

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： J.F. Peters Z. Pawlak A. Skowron Department of Electrical and Computer Engineering University of Manitoba Winnipeg MAN Canada Institute of Theoretical and Applied Informatics Polish Academy of Sciences Gliwice Poland Institute of Mathematics Warsaw University of Technology Warsaw Poland

This article introduces an approach to measures of information granules based on rough set theory. Informally, an information granule is a representation of a multiset (or bag) of real-world objects that are somehow indistinguishable, or similar, or which cause the same functionality. Examples of measures of information granules based on the rough set theory are inclusion, closeness, size, and enclosure. All of these measures are based on rough inclusion. This paper is limited to a consideration of measures of inclusion based on a straightforward extension of classical rough membership functions and closeness based on measurement of separation of equivalence classes in a partition of the universe containing information granules. Measurement of sensor-based information granules has been motivated by recent studies of sensor signals. A sensor signal is a non-empty, finite set of sample sensor signal values temporally ordered. Classification of sensor signals requires measurements of sample signal values over subintervals of time. This article introduces a rough set approach to measuring information granule inclusion and closeness.

关键词： Set theory Size measurement Intelligent sensors Informatics mathematics Electric variables measurement Water resources Helicopters Robots Time measurement

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Evolving networks with multispecies nodes and spread in the number of initial links

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Physical Review E 2002年第4期66卷 046115-046115页

作者： Jong-Won Kim Brian Hunt Edward Ott Department of Physics and Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 Department of Mathematics and Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742

We consider models for growing networks incorporating two effects not previously considered: (i) different species of nodes, with each species having different properties (such as different attachment probabilities to other node species) and (ii) when a new node is created, its number of links to old nodes is random with a given probability distribution. Our numerical simulations show good agreement with analytic solutions. As an application of our model, we investigate the movie-actor network with movies considered as nodes and actors as links.

关键词： Large scale systems

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Recruitment filtering with personality-job fit model

Recruitment filtering with personality-job fit model

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International Conference on Information technology: Coding and Computing (ITCC)

作者： S. Supjarerndee Y. Temtanapat U. Phalavonk Faculty of Information Technology King Mongkut''s Institute of Technology North Bangkok Bangkok Thailand Computer and Info. Sci. Department Faculty of Applied Science KMITNB Bangkok Thailand Mathematics Department Faculty of Applied Science KMITNB Bangkok Thailand

Many job applications on the Web provide only simple Boolean comparison using only basic information requirements (i.e., degree, age) for searching and matching jobs to candidates. The net effect is too many 'hits'. We showed that personality is an important factor for the hiring process and satisfaction of employers and employees. In designing better filters for searching and matching a job application on the Web, we considered this factor with general job requirements and then combined it with our matching process. We have tested our model using data obtained from applicants who applied for jobs with a company in Thailand. The results show that we are able to give a better match than that achieved using basic qualifications only.

关键词： Recruitment Employment Internet Information technology mathematics Job design Information filtering Information filters Matched filters Testing

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Estimation of clock offset from one-way delay measurement on asymmetric paths

Estimation of clock offset from one-way delay measurement on...

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Workshops on Applications and the Internet (SAINT)

作者： M. Tsuru T. Takine Y. Oie GENESIS Project Telecommunications Advancement Organization of Japan Japan Department of Applied Mathematics and Physics Graduate School of Informatics Kyoto University Japan Department of Computer Science and Electronics Kyushu Institute of Technology Japan

ISBN: (纸本)0769514502

As the Internet is shifting towards a reliable QoS-aware network, accurately synchronized clocks distributed on the Internet are becoming more significant. The network time protocol (NTP) is broadly deployed on the Internet for clock synchronization among distributed hosts, but is weak in asymmetric paths, i.e., it cannot accurately estimate the clock offset between two hosts when the forward and backward paths between them have different one-way delays. In this paper, we focus on estimating the offset and skew of a clock from one-way delay measurement between two hosts, and propose an idea for improvement of such estimations, which reduces estimation errors when the forward and backward paths have different bandwidths, a major factor in asymmetric delays.

关键词： Delay estimation Clocks Synchronization Bandwidth IP networks Protocols Internet Estimation error Application software Web server

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Inferring traffic flow characteristics from aggregated-flow measurement

Inferring traffic flow characteristics from aggregated-flow ...

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Symposium on Applications and the Internet (SAINT)

ISBN: (纸本)0769514472

In the Internet, a statistical perspective of global traffic flows has been considered as an important key to network management. Nonetheless, it is expensive or sometime difficult to measure statistics of each flow separately. Therefore, it is of practical importance to infer unobservable statistical characteristics of individual flows from characteristics of the aggregated-flows that are easily measured at some links (router interfaces) in the network. We propose a new approach to such inference problems, and provide some examples of inferring unobservable arrival rates of packets on each flow from measurement of the aggregated-flows. Our method is applicable to cases not covered by the existing methods for the OD traffic matrix inference. We also show simulation results, which indicate the potential of our approach.

关键词： Fluid flow measurement Telecommunication traffic Traffic control Routing mathematics Physics Informatics computer science IP networks computer network management

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MIXED FINITE ELEMENT METHODS BASED ON RIESZ-REPRESENTING OPERATORS FOR THE SHELL PROBLEM

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Acta Mathematicae Applicatae Sinica 2001年第3期17卷 332-339页

作者：段火元张大力 Department of Computer Sciences China University of Geo-Sciences Beijing China Department of Applied Mathematics Harbin Institute of Technology Harbin China

To solve the shell problem, we propose a mixed finite element method with bubble-stabili -zation term and discrete Riesz-representation operators. It is shown that this new method is coercive, implytng the well-known X-ellipticity and the Inf-Sup condition being circumvented, and the resulting linear system is symmetrically positively definite, with a condition number being at most O(h-2). Further, an optimal error bound is attained.

关键词： Koiter shell mixed finite element approximation local bubble functions Riesz-representing operators

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