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Enhanced Path Prediction for network Resource Management in Wireless LANs

IEEE Wireless Communications 2003年第6期10卷 62-69页

作者： Kyriakakos, Miltiadis Frangiadakis, Nikolaos Merakos, Lazaros Hadjiefthymiades, Stathes University of Athens Department of Informatics Communication Networks Laboratory Greek Consulting Firm Advanced Services Group Ltd. Communication Networks Laboratory University of Athens University of Aegean Dept. of Information Engineering Fac. of the Hellenic Open University Patras Greece Department of Telecommunication University of Maryland College Park Communication Networks Laboratory Department of Informatics University of Athens Fac. of Elec. Eng./Computer Science University of Connecticut Storrs Faculty of Electrical Computer Engineering Department Northeastern University Boston MA Commun./Digit. Proc. Research Center Northeastern University IBM T. J. Watson Research Center Yorktown Heights NY Faculty of the University of Athens Greece Department of of Informatics Communication Network Laboratory Netwk. Oper. and Management Center

Path prediction is currently being considered for use in the context of mobile and wireless computing toward more efficient network resource management schemes. Path prediction allows the network and services to further enhance the quality of service levels the user enjoys. Such mechanisms are mostly meaningful in infrastructures like wireless LANs. In this article we present a path prediction algorithm that exploits the machine learning algorithm of learning automata. The decision of the learning automaton is driven by the movement patterns of a single user but is also affected by the aggregated patterns demonstrated by all users. Simulations of the algorithm, performed using the Realistic Mobility Pattern Generator, show increased prediction accuracy.

关键词： Wireless telecommunication systems

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Web-based distance education learning environments in graduate software engineering

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International Journal of Continuing Engineering Education and Life-Long Learning 2001年第1-2期11卷 53-68页

作者： Michele Jacobsen, D. Kremer, Rob Shaw, Mildred L.G. Faculty of Education 1102 Education Tower University of Calgary 2500 University Drive NW Calgary Alta T2N 1N4 Canada Department of Computer Science University of Calgary Calgary Alta. T2N 1N4 Canada Software Eng. Research Network Department of Computer Science University of Calgary Calgary Alta. T2N 1N4 Canada

The Software Engineering research network (SERN) has experimented with methods for delivering graduate software engineering courses at a distance. This paper describes our experiences with course redesign and delivery using the web, distance instruction, evaluating student learning environments, and technology tools and requirements. The methods used to prepare courses for distance delivery are described. Several technological tools to facilitate computer-mediated communication, WebCT, electronic mail, a list server, and NetMeeting, were used. Observations about workload requirements for teaching, support, instructional design, and maintenance are described for the benefit of faculty members who are interested in moving towards distance delivery methods. The evaluation methods used to understand the distance learning environments experienced by graduate students are outlined and explained. An analysis and report on the data and information collected from students and instructors is presented and discussed. Finally, recommendations are made for future research and practice with distance learning environments in graduate education.

关键词： Engineering education

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Diagrams Based on Structural Object Perception 00

Diagrams Based on Structural Object Perception

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Proceedings of the Working Conference on Advanced Visual Interfaces

作者： Pourang Irani Colin Ware Faculty of Computer Science University of New Brunswick Box 4400 Fredericton NB Canada E3B 2A3 Data Visualization Research Lab Center for Coastal and Ocean Mapping University of New Hampshire Durham NH

ISBN: (纸本)9781581132526

Most diagrams, particularly those used in software engineering, are line drawings consisting of nodes drawn as rectangles or circles, and edges drawn as lines linking them. In the present paper we review some of the literature on human perception to develop guidelines for effective diagram drawing. Particular attention is paid to structural object recognition theory. According to this theory as objects are perceived they are decomposed into 3D set of primitives called geons, together with the skeleton structure connecting them. We present a set of guidelines for drawing variations on node-link diagrams using geon-like primitives, and provide some examples. Results from three experiments are reported that evaluate 3D geon diagrams in comparison with 2D UML (Unified Modeling Language) diagrams. The first experiment measures the time and accuracy for a subject to recognize a sub-structure of a diagram represented either using geon primitives or UML primitives. The second and third experiments compare the accuracy of recalling geon vs. UML diagrams. The results of these experiments show that geon diagrams can be visually analyzed more rapidly, with fewer errors, and can be remembered better in comparison with equivalent UML diagrams.

关键词： perception diagramming geon theory 3D diagrams visual display information visualization

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Measure-driven

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Journal of Software Maintenance and Evolution 2000年第1期12卷 47-78页

作者： Cantone, Giovanni Dept. Info. Syst. Prod. Mgmt. Eng. University of Rome at Tor Vergata Roma Italy Dept. Info. Syst. Prod. Mgmt. Eng. University of Rome at Tor Vergata S.N.C. Roma Italy Department of Computer Science Dept. Info. Syst. and Prod. Mgmt. Faculty of Engineering Italy Scientific-Technical Committee Admin. and Docum. Computing Center University of Rome at Tor Vergata Roma Italy University of Naples University of Maryland Italy Intl. Software Eng. Research Network Italy UMD Exp. Software Engineering Group Italy Ital. Assoc. Info. Automat. Comp. Italy Faculty of Engineering University of Naples Italy

This paper reports on an on-going project undertaken within the University of Rome at Tor Vergata to automate the business processes of a class of administrative organizations. The experience gained and the lessons learned, while performing in the role of Innovation-driver, are abstracted and presented. In the context of this experience with process re-engineering, the paper compares the utility of empirically investigating software technology transfer with the reuse of technology measurement models possibly available. The paper also discusses the roles played by various environmental factors - technology, experimentation and measurements, an organization's business objectives, and other organizational issues, including the expected benefits and costs - in the empirical investigation of software technology transfer. The paper concludes by presenting a short case study and three lessons learned. Copyright © 2000 John Wiley and Sons, Ltd.

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A parallel analog intelligent vision sensor with a variable receptive field

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Systems and computers in Japan 1999年第1期30卷 60-69页

作者： Yagi, Tetsuya Kameda, Seiji Iizuka, Kunihiko Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka 820-8502 Japan Advanced Technology Research Laboratories Sharp Tenri 632-0004 Japan Institute of Physiological Science Okazaki Japan Nagoya Institute of Technology Japan Institute of Electronics Information and Communication Engineers Japan Society of Instrument and Control Engineers Japan Japanese Neural Network Society Japan Association for Research in Vision and Opthalmology Japan Kyushu Institute of Technology Japan Advanced Technology Research Laboratories Tenri Japan

The retina is an intelligent vision sensor indispensable in real-time image information processing of animals. The parallel image processing function of the retina was realized in an analog CMOS integrated circuit (vision chip). The chip was implemented with a one-dimensional Laplacian-Gaussian receptive field the size of which can be controlled by external signals. Active pixel sensors were used in the sensor part of the chip where the light sensitivity can be controlled by varying the accumulation time. Circuits compensating for noise due to the mismatch of transistor characteristics were incorporated, and the experimental results verified that sufficiently accurate outputs can be obtained under natural illumination. The chip can effectively extract the spatial frequency bandwidth of the signal in the presence of noise. © 1999 Scripta Technica.

关键词： Analog VLSI Laplacian-Gaussian Offset compensation Parallel processing Variable receptive field Vision chip

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Using document relationships for better answers 4th

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4th International Workshop on Principles of Digital Document Processing, PODDP 1998

作者： Wu, Mingfang Wilkinson, Ross Department of Computer Science Royal Melbourne Institute of Technology 723 Swanston St. Carlton Melbourne3053 Australia Mathematical and Information Sciences CSIRO and Research Data Network Cooperative Research Centre 723 Swanston St. Carlton Melbourne3053 Australia

ISBN: (纸本)9783540650867

In most retrieval systems the answer to a query is a ranked list of documents. There is little information about the ranking and no support for exploring the relationships that may exist between the documents. In this paper we consider the use of clustering answers to better support users satisfying their information needs. We show how clustering reflects the nature of some information needs, and how the clustering can be used to find more relevant documents than would be the case using simple lists. This work contributes to our approach of building answers to information needs, rather than simply providing lists. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Query processing

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Applying fuzzy functions and sequential coordination to optimization of machinery arrangement and pipe routing

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NAVAL ENGINEERS JOURNAL 1998年第6期110卷 43-54页

作者： Wu, BC Young, GS Schmidt, W Choppella, K Dr. Bi-Chu Wu:received a PhD in Mechanical Engineering from the University of Maryland College Park in 1991. She has worked on projects involving naval architecture design optimization solid mechanics and database development. Presently a senwr engineer with Angle Incorporated Dr Wu's research interests are in design optimization and fuzzy logic applications. Dr. Gin-Shu Young: a senior engineer with Angle Incorporated holds a PhD in Mechanical Engineering from the University of Maryland College Park. As a guest researcher with National Institute of Standards and Technologies from 1990 to 1993 he worked on vision-based navigation for autonomous vehicles. His experience also includes applications of optimization fuzzy logic neural network and genetic algorithm methods to engineering system design Mr. William Schmidt:co-founded Angle Incorporated in 1990 and has served as Vice PresidentlChiefScientist during this tame. He holds a B.Sc. in Applied Science from the Naval Acadt?my and an M.Sc. in Physics from the Naval Post Graduate School. He has cner 20 years experience in technical leadership material and personnel management. He has led the application of computer aided design (CAD) and Product Model Information Exchange to the shipbuilding industry. His experience also includes leading the amlication of model based operational analysis to support the Live Fire Test Program for DDG 51 Class Destroyers. Mr. Krishna M. Choppella:is a Sofware Engineer at Eidea Laboratories Incotporated where he works on componentbased distributed enterpvise frameworks. He has been involved in creating data analysis tools for the US Nay by integrating CAD modeis databases and graphical front ends. His work in the Masters degree program in Mechanical Engineering at the University of Texas at Austin was in di0ddase.r spectroscopy of combustion products in porous-matri burners. He received his Bachelors degree in Electrical Engineering in India. He was a Research Associate at the Centre for Laser Technology and Project Engi

Ship design is often multidisciplinary involving several design elements with various types of objectives and constraints (O/C) some easily described as mathematical formulas, others better modeled as descriptive assertions. This paper describes a method based on fuzzy functions and an integrated performance index to model O/C using descriptive assertions to be used with mathematical formulas in optimization. Another issue addressed in this paper concerns the coordination of design elements when sequentially coupled, that is, when one leads the other and the performance of the follower depends greatly on the design of the leader. Based on neuro-fuzzy techniques, the method described here coordinates and optimizes sequentially coupled elements. The two methods are applied to machinery arrangement (MA) and pipe routing (PR). Preliminary models for optimization of MA and PR are described considering convenience, producibility: engine room size, interference and location as factors in the O/C set. Some test results from MA/PR applications are presented and discussed. The methods are generic and can be extended to other elements in ship design. They are mutually independent and may be used separately Two advantages of their use are an improvement in overall performance and a reduction in the need for redesign of elements.

关键词： Optimization

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An overview of catalog design problems in resource discovery

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INTERNET research-ELECTRONIC networkING APPLICATIONS AND POLICY 1996年第1期6卷 33-&页

作者： Goodchild, A Andrew Goodchild is a PhD student at the Department of Computer Science University of Queensland QLD 4072 Australia. Tel: +61 7 3365 4209 Fax: +61 7 3365 1999 E‐mail: andrewg@cs.uq.oz.au . He is also affiliated as a Student with the Distributed Systems Technology Centre DSTC and the Research Data Network Collaborative Research Centre RDN‐CRC

Discusses some of the problems designers face in building catalogs in large networks and relates them back to the resource discovery problem. Currently many catalogs tend to be built in an ad hoc fashion-which leads to a great variety in the quality of publicly accessible network catalogs. Furthermore, the research surrounding these catalogs tends to focus on narrow technical issues-resulting in difficult-to-use catalogs. Addresses this problem by providing a usability framework based on the library science and human computer interaction literature, and demonstrates some of those principles via an example of a prototype. Results are interesting to resource discovery tool developers in that a framework for understanding the general resource discovery problem is provided and some techniques for dealing with those problems are presented.

关键词： design and development information retrieval interfaces resources

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Development and application of MCAL tools for marine radar instruction

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computer Applications in Engineering Education 1995年第4期3卷 259-259页

作者： Guirguis, S. Korany, E. Abdel-Bary, A. Institute of Graduate Studies and Research Alexandria University Alexandria Egypt Shawkat K. Guirguis:obtained the BSc and M.Sc. degrees in Computer Science and Automatic Control Faculty of Engineering Alexandria University in 1981 and 1984 respectively. In 1988 he obtained a PhD degree in Electronics and Communications Faculty of Engineering Cairo University co-supervised by the Imperial College of Science and Technology University of London where he spent two years as an academic visitor. His current research interests include software quality management multimedia automatic programming and decision support systems. He is currently a lecturer of Computer Science at the Institute of Graduate Studies & Research Alexandria University. Ezzat A. Korany:received the BS degree in Electrical Engineering (Electronics Section) from the University of Alexandria Egypt in 1971 the MS degree in Electrical Engineering (Computer Section) from Ain Shams University Cairo Egypt in 1977 and the PhD degree in Electrical Engineering (Digital Systems) from Florida Institute of Technology U.S.A. in 1982. He is currently an associate professor of Computer Science at the Institute of Graduate Studies & Research University of Alexandria. His research interests are in data communications and multimedia applications computer networks image processing and pattern recognition. Abdel-Latif A. Abdel-Bary:obtained the BEng degree in Electronics Technology from Arab Maritime Transport Academy in 1986. In 1995 he obtained the MSc degree in Information Technology from the Institute of Graduate Studies & Research Alexandria University. His current research interests include ICAL hypermedia and automatic programming.

In this article a multimedia computer-assisted learning (MCAL) system is presented. The major objective of this work was to investigate the potential of using such systems as tools for transferring instructional course information through various types of computer media as opposed to the classic CAL systems. The philosophy and techniques employed to design the system are investigated. Usage of the implemented system and its merits have been illustrated through its application to teach engineering students and technicians the theory and concepts of marine radar. System design, implementation, test, and revision phases are presented and discussed.

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data fusion using large multi-agent networks: an analysis of network structure and performance

Data fusion using large multi-agent networks: an analysis of...

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International Conference on Multisensor Fusion and Integration for Intelligent Systems (MFI)

作者： A. Knoll J. Meinkoehn Department of Computer Science Faculty of Technology University of Bielefeld Bielefeld Germany National Research Corporation for Mathematics and Data Processing Berlin Germany

Concerns the multi-agent paradigm for structuring the data fusion in large networks of information sources. The general goal is the maximisation of the quality of the result at minimum cost. To this end agents compete for scarce resources or they work in parallel. Both the general granularity of the agent society and the competence assigned to each individual agent determine the information flow. The multitude of parameters involved makes it difficult to optimally adapt the network structure to a given class of sensing tasks. We outline possible network structures and present an approach for analysing a number of important parameters characterising the network. The abstraction enables comparison of different structures. The methods for the analysis may be readily refined to evaluate a specific problem. A model of lateral coordination control in proposed as a result. It is based on the notion of negotiated cooperation between pairs of autonomous sensor agents. The cooperation phase is preceded by a bidding scheme to establish logical communication links. The cooperation is modelled on human social behaviour.< >

关键词： Performance analysis Sensor fusion Costs Fuses Sensor systems Cameras Information analysis computer science Mathematics data processing

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