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EUROCON'2001, Trends in Communications, International Conference on.

Date 4-7 July 2001

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  • IEEE Region 8 Eurocon'2001 International Conference on Trends in Communications

    Publication Year: 2001, Page(s):0_2 - 0_21
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  • DTEx-Sys-a Web oriented intelligent tutoring system

    Publication Year: 2001, Page(s):255 - 258 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB) | HTML iconHTML

    Distance learning systems (DLSs) are a class of important services that information infrastructures have to provide users. DLSs base their operation on information access, electronic transaction and communication services furnished by information infrastructures. Regarding the teaching process, by using DLSs new paradigms enable users to distribute educational content to support interaction among ... View full abstract»

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  • Distance learning approach in multimedia tutoring

    Publication Year: 2001, Page(s):259 - 262 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB) | HTML iconHTML

    In our paper, we present different approaches to designing multimedia presentations with multimedia authoring tools. We present different possibilities in implementing media (such as text, graphics, animation, sound and video) in one such authoring tool and compare its capabilities for managing and manipulating media compared with other multimedia authoring tools. The heart of the matter is an int... View full abstract»

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  • Evaluation board for education of engineers in wireless communications

    Publication Year: 2001, Page(s):263 - 265 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (387 KB) | HTML iconHTML

    The aim is to create a complete environment for the design and testing of an instructional set of boards for the HF transmission of digital data in QPSK or OQPSK modulation format. During the 30 hours of the study, the electrical engineering student must simulate with MACHXL/sup TM/, Matlab/sup TM/ and HPADS/sup TM/ the digital and HF parts of the six boards constituting the link. The tests and me... View full abstract»

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  • Collaborative courseware authoring and publishing based on WebDAV, XML, and XSLT

    Publication Year: 2001, Page(s):266 - 269 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (679 KB) | HTML iconHTML

    Teaching and learning is naturally an interactive, recursive, and iterative process. Consequently, the courseware is almost always changing during the whole teaching and learning process, which makes courseware authoring and publishing more complicated. In addition, with today's use of Web-enabled global cooperation in education, courseware authoring and publishing is further becoming a collaborat... View full abstract»

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  • A DVD presentation for the support of teaching telecommunications protocols

    Publication Year: 2001, Page(s):270 - 273 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (541 KB) | HTML iconHTML

    This paper describes a DVD (digital versatile disc) presentation for help in teaching telecommunications protocols. Our goal was to make the teaching of protocols more illustrative than it usually is when using material from textbooks or standards. We made films that show what happens when an ISDN subscriber calls another subscriber, which has two ISDN telephones. The films show the processes and ... View full abstract»

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  • Using the Web in supplementary teacher education

    Publication Year: 2001, Page(s):274 - 277 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (607 KB) | HTML iconHTML

    In the last ten years, there has been considerable interest in the educational applications of electronic networking. The use of the WWW has been adopted into every aspect of educational life. The academic community supports the use of the Web as a tool to enhance teaching and learning. The problem is that the implementation of Web courses is not an easy task. This paper presents the available too... View full abstract»

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  • Using interactivity in computer-facilitated learning for efficient comprehension of mathematical abstractions

    Publication Year: 2001, Page(s):278 - 281 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB) | HTML iconHTML

    Mathematical concepts often form a basis for creating more complex concepts. We address the problem of learning automata theory which is the starting point for understanding a number of natural and technical sciences. Mathematical abstractions used for defining and describing entities of automata theory and their interaction can present an uncrossable obstacle in the process of learning this basic... View full abstract»

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  • Performance improvement for very high-speed DWDM optical metropolitan-area networks using a passive star topology

    Publication Year: 2001, Page(s):282 - 285 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB) | HTML iconHTML

    Broadcast and select optical networks offer an attractive way of building LAN and MAN of high bit rates. However, the disadvantages of this architecture such as high cost power waste, and poor security necessitate finding a solution for these problems. We propose a new architecture, which aims at minimizing these drawbacks. The new architecture is based on an optical passive star topology and a ne... View full abstract»

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  • An exact throughput analysis of optimum adaptive go-back-N scheme

    Publication Year: 2001, Page(s):286 - 288 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (254 KB) | HTML iconHTML

    An optimum adaptive go-back-N (GBN) scheme is studied. The considered scheme is an enhancement of recently proposed adaptive schemes in the papers by Yao (1995), Chakraborty and Liinaharja (1999), with principles of the optimum GBN scheme presented by Bruneel and Moeneclaey (1986) in their study. An exact throughput analysis of the scheme is presented. View full abstract»

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  • Formal definition of SIP proxy behavior

    Publication Year: 2001, Page(s):289 - 292 vol.2
    Cited by:  Papers (4)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB) | HTML iconHTML

    The rapid growth of the Internet has made possible the use of multimedia in WAN communication. In order to control multimedia sessions between users, the SIP protocol was introduced. The original definition of the SIP protocol is given in the form of a RFC document that contains a number of implementation and compatibility problems. In order to formally define the SIP protocol and thus remove the ... View full abstract»

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  • Formal definition of SIP end systems behavior

    Publication Year: 2001, Page(s):293 - 296 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB) | HTML iconHTML

    The rapid improvement of hardware performance and the constantly growing bandwidth of computers have encouraged the development of communications based on computer networks. The first step in this direction is the definition of a set of protocols that will enable the design and implementation of various multimedia communication services. SIP (session initiation protocol) is a protocol for initiati... View full abstract»

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  • Hybrid self-adaptive WWW cache coherence protocol (hSATTL): improving the coherence of WWW objects

    Publication Year: 2001, Page(s):297 - 300 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB) | HTML iconHTML

    Proxy caches in classical server-client architecture may decrease the amount of data transfer and reduce network congestion, hut they also impose a cache-coherence problem. Objects replicated in proxy caches must be kept coherent. Although various protocols for maintaining cache coherence in the World Wide Web (WWW) have been introduced, there does not exist a highly efficient solution to the cohe... View full abstract»

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  • Decision function in hybrid self-adaptive WWW cache coherence protocol (hSATTL)

    Publication Year: 2001, Page(s):301 - 304 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB) | HTML iconHTML

    To improve the performance of the multiprocessor, distributed and Internet-based systems, data replication is being introduced. Existence of multiple copies of the same object in the system causes the cache coherence problem. There are two basic mechanisms for maintaining cache coherence: write-invalidate and write-update mechanisms. Various protocols for multiprocessor and distributed systems hav... View full abstract»

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  • Analysis of throughput performance of a modified hybrid ARQ scheme for reliable transport services

    Publication Year: 2001, Page(s):305 - 308 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    The contribution of this paper proposes a modified hybrid ARQ scheme for reliable transport services. The stress is in the analysis of the throughput performance, comparison and simulation of hybrid ARQ type I and type II in our scheme. View full abstract»

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  • 2 GHz single-floor indoor propagation results

    Publication Year: 2001, Page(s):309 - 311 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB) | HTML iconHTML

    Indoor propagation embraces various situations differing by the geometry of the buildings and their constituent materials. If the effects on propagation of these various parameters can be efficiently studied by a simulation approach, for instance by ray-tracing methods, it is necessary to assess the results of such studies by as much experimental data as possible collected in various types of envi... View full abstract»

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  • Improvements of ITU-R field strength prediction methods for land mobile services

    Publication Year: 2001, Page(s):312 - 313 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (157 KB) | HTML iconHTML

    In a real radio system design, an accurate estimation of the electric field level provides a good basis for a proper selection of base station locations and a proper determination of the frequency plan. However, an accurate prediction of the electric field level is a very complex and difficult task. To date, various field strength prediction methods have been proposed in the literature. One very p... View full abstract»

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  • Stability of FDTD in curvilinear coordinates

    Publication Year: 2001, Page(s):314 - 317 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB) | HTML iconHTML

    A new approach suitable for determination of the maximal stable time step for the finite-difference time domain (FDTD) algorithm in curvilinear coordinates is presented. It is based on a modified variable separation method, applied to the set of difference equations of the FDTD algorithm. Investigation is carried out in spherical and cylindrical coordinates. A simple yet accurate enough approximat... View full abstract»

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  • Millimetre wave utilisation and propagation research in the Czech Republic

    Publication Year: 2001, Page(s):318 - 320 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (245 KB) | HTML iconHTML

    TESTCOM is engaged in an experimental propagation research in the frequency bands over 10 GHz. The research is especially focused on attenuation due to hydrometeors on line-of-sight paths. The aim of our research is to obtain long-term radio and radio meteorological data in our climatic conditions and to use them for proposals of cumulative distributions of attenuation due to hydrometeors for the ... View full abstract»

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  • An asymptotic blind time delay estimation

    Publication Year: 2001, Page(s):321 - 324 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (318 KB) | HTML iconHTML

    This paper addresses a new approach to time-delay estimation based upon the autocorrelation estimator (AE) and asymptotic expansions especially in low SNR in a multipath channel. The following cases are considered for the estimation of time-delays: (1) different types of signals; (2) (non)-Gaussianity for signal and noise; and (3) (non)resolveability of the time-delays. The maximum likelihood esti... View full abstract»

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  • Chirp radar ambiguity function shaping

    Publication Year: 2001, Page(s):325 - 328 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB) | HTML iconHTML

    The ambiguity function of chirp radar is shaped by compression filter design. The proposed optimization procedure for compression filter synthesis takes into account minimum loss in resolution and maximum reduction of sidelobes in the preferred Doppler range. This algorithm can be applied in high-resolution radar and sonar design. View full abstract»

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  • The eclipsing zone problem in the chirp radar

    Publication Year: 2001, Page(s):329 - 332 vol.2
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB) | HTML iconHTML

    Eclipse effect analysis is performed for the chirp radar using the chirp signal ambiguity function. A new approach to sidelobe suppression for the radar compression filter response is proposed, which enables better detection and tracking of the targets within the eclipsing zone. View full abstract»

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  • Matched and mismatched pulse compression in medical ultrasound imaging

    Publication Year: 2001, Page(s):333 - 336 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB) | HTML iconHTML

    Pulse compression theory and techniques were developed originally for radar systems but could be carefully adopted for ultrasound-specific problems. In past ten years a considerable amount of research has been done in the area of mismatched filtering for the purpose of its application in ultrasound. However, in a similar way to radar systems for distributed targets, pulse compression has not achie... View full abstract»

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  • The design of mobile multimodal communication device - personal navigator

    Publication Year: 2001, Page(s):337 - 340 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB) | HTML iconHTML

    The personal navigator presents a multimodal communication device. To its user it enables visual, tactile and voice communication. Visual and tactile communication between the user and the navigator runs over a graphical LCD display with touch-panel, which in that way serves as an input and output device. Through GSM data communication the personal navigator is connected to a navigation server, wh... View full abstract»

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  • Position aware group information services

    Publication Year: 2001, Page(s):341 - 344 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB) | HTML iconHTML

    We present an analysis of the needs of groups of individuals for positioning information using mobile multimedia terminals for accessing location-based information. We consider first a simple framework relating the needs of individuals and groups to information about the location of other group members. The concept of a layered service for delivering position-dependent information to mobile device... View full abstract»

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