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International conference on Parallel and Distributed systems (ICPADS)

作者： D.J. Chen M.S. Chang C.I. Yang Kuo-Lung Ku Institute of Computer Science and Information Engineering National Chiao Tung University Hsinchu Taiwan Chung Shang Institute of Science and Technology Taoyuan Taiwan

In this paper, we attempt to develop reliability models for the reliability analyses in distributed multimedia system. We propose two polynomial-time algorithms to compute the multimedia task reliability (MTR) and time-constraint multimedia task reliability (TCMTR) for distributed multimedia system based on token ring networks. Two main algorithms, multimedia task reliability for ring (MTRR) and multimedia task reliability for path (MTRP), are used to compute the MTR. For time constraint media access, we extend our proposed algorithms to compute TCMTR.

关键词： Token networks multimedia systems Computer network reliability Polynomials Algorithm design and analysis Computer science Reliability engineering Computer networks Distributed computing Time factors

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Applying a flexible OODBMS-IRS-coupling to structured document handling

Applying a flexible OODBMS-IRS-coupling to structured docume...

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International conference on Data Engineering

作者： M. Volz K. Aberer K. Bohm GMD-IPSI Darmstadt Germany

In document management systems, it is desirable to provide content-based access to documents going beyond regular expression search in addition to access based on structural characteristics or associated attributes. We present a new approach for coupling OODBMSs (object-oriented database management systems) and IRSs (information retrieval systems) that provides enhanced flexibility and functionality as compared to coupling approaches reported from the literature. Our approach allows one to decide freely to which document collections, that are used as retrieval context, document objects belong, which text contents they provide for retrieval, and how they derive their associated retrieval values, either directly from the retrieval machine or from the values of related objects. Especially, we show how, in this approach, different strategies can be applied to hierarchically structured documents, possibly avoiding redundancy and IRS or OODBMS peculiarities. content-based and structural queries can be freely combined within the OODBMS query language.

关键词： Document handling content based retrieval SGML content management multimedia systems multimedia databases Spatial databases Uncertainty Object oriented databases Database languages

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Integration of a relational database with multimedia data

Integration of a relational database with multimedia data

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IEEE Annual International Computer Software and Applications conference (COMPSAC)

作者： S.M. Chung P.S. Mah J.L. Kim Department of Computer Science and Engineering Wright State University Dayton OH USA Software Engineering Division Systems Engineering Research Institute Daejeon South Korea Software R & D Center Hyundai Electronics Industrial Company Limited Seoul South Korea

We propose a method for integrating a preexisting conventional database system with a multimedia server in a multidatabase environment. In the multidatabase environment, changes to the preexisting database system are not allowed because such changes are too expensive. For the integration, high-level semantic description of multimedia data is modeled using the enhanced entity-relationship (EER) model to support content-based retrieval of multimedia data. The EER design is translated into a schema of the preexisting database system and then the translated schema is integrated with the preexisting database schema. The content description can be used to locate pertinent multimedia data, and the identifiers are used to access the multimedia data stored in the multimedia server. However, with only a simple schema representation of the semantic description of multimedia data, high levels of recall and precision of queries may not be obtained because conventional database systems provide only exact matching answers to the query. Thus, we extended the conventional query processing mechanism by providing a modified cooperative query answering mechanism.

关键词： Relational databases multimedia databases Database systems Information retrieval Videos Data engineering content based retrieval systems engineering and theory Graphics Sprites (computer)

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On the evolution of mobile network protocols towards the support of multimedia teleservices

On the evolution of mobile network protocols towards the sup...

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IEEE International conference on Communications (ICC)

作者： A. Iera S. Marano A. Molinaro D. E. I. S. Universita della Calabria Rende Cosenza Italy

Starting from the idea that "multimedia" mainly means the integrated manipulation of information, and hence the independent handling of each separate information is not a sufficient result, an enhanced architecture for the UMTS system, involving the low levels (physical, MAC, DDL, and network) of the protocol stack, is proposed for the transport of wireless multimedia. To achieve the best performance from the designed architecture, a synchronisation sub-layer is introduced at the network level, with the main aim of assuring over the air interface "rough" inter-stream synchronisation, used as a first step before a "fine" end-to-end synchronisation is performed by the highest protocol levels. A detailed description of the new functions for each level, their basic algorithms, their location in the protocol stack, as well as the signalling exchange among the modules implementing them and between network and user sides are given.

关键词： 3G mobile communication Mobile communication access protocols multimedia systems Personal communication networks Electronic mail Media access Protocol Transport protocols Wireless application protocol Base stations

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Holographic memory for fast data access

Holographic memory for fast data access

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IEEE Photonics conference (IPC)

作者： J. Hong J. Ma T. Chang I. McMichael W. Christian D. Pletcher Rockwell Science Center Inc. Thousand Oaks CA USA

A unique feature of holographic mass memory is its potential for fast random access if nonmechanical means for page addressing are implemented. In this paper, we describe fast access holographic memory architectures that use acoustooptic deflectors as addressing devices and discuss the critical design issues. We also describe recent Rockwell efforts to develop a fast access holographic memory system.

关键词： Holography Delay Optical signal processing Laser tuning Costs Holographic optical components Array signal processing Signal processing algorithms multimedia systems Time measurement

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A content based video traffic model using camera operations

A content based video traffic model using camera operations

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IEEE International conference on Image Processing

作者： P. Bocheck Shih-Fu Chang Department of Electrical Engineering and Image Technology for Nlew Media Centex Columbia University New York NY USA

We present our work on content based video (CBV) traffic modeling of variable bit rate (VBR) sources. The CBV approach differs from previous works in that it is not based only on matching of various statistics of the original source, but rather on modeling and mapping its visual content into the corresponding bit rate. We show that the CBV model is fully compatible with current and future compression algorithms including those of very low bit rate video coding. We introduce the separation principle between the visual content and encoder dependent bit rate mapping. We construct and verify two experimental CBV models for basic camera operations. The results obtained show that the CBV model can closely match the various statistics of the MPEG-2 VBR stream.

关键词： Traffic control Cameras Layout Streaming media Video compression Bit rate Visual effects Statistics multimedia systems Image coding

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Providing generalized rate monotonic scheduling theory to I/O abstractions over timed token protocol MAC networks

Providing generalized rate monotonic scheduling theory to I/...

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IEEE International conference on Engineering of Complex Computer systems

作者： J. Echague J. Vila A. Crespo Departamento de Informática Universidad Jaume I Castellon Spain DISCA Universidad Politécnica de Valencia Valencia Spain

This paper presents a high-level abstraction for remote communication which allows to establish connections with real-time requirements. The approach is based on the idea of structuring applications as modules with a set of external visible data structures which act as I/O ports. Parts can be interconnected using real-time connections. This interconnection is done in a configuration phase and it allows to integrate modules or applications dynamically. Real-time connections produce streams of messages with time constraints. Messages are scheduled by means of a priority model where priorities are assigned following generalized rate monotonic scheduling (GRMS) theory. The proposed system is built over a network with the timed token protocol (TTP) medium access control (MAC). A discussion on how to provide GRMS abstractions over TTP is given. Comparison results between current scheduling algorithms and the proposed model are also provided.

关键词： Data structures Media access Protocol Token networks Time factors Streaming media Processor scheduling access protocols Scheduling algorithm multimedia communication Testing

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Interactive learning with a digital library in computer science

Interactive learning with a digital library in computer scie...

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Frontiers in Education (FIE) conference

作者： E.A. Fox Department of Computer Science Virginia Polytechnic Institute and State University Blacksburg VA USA

We have developed tools, expanded our digital library systems and content, and built almost 5000 "pages" of WWW-accessible courseware, increasing the interactivity and quality of learning about computer science. Evaluation has shown that learning practices have changed, most students are happy with the emerging infrastructure and pedagogy, and there is growth in both local and remote access to our http://*** server.

关键词： Software libraries Computer science Web server Network servers Courseware Computer science education multimedia databases Testing Wide area networks Ethernet networks

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A hierarchical network storage architecture for video-on-demand services

A hierarchical network storage architecture for video-on-dem...

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conference on Local Computer Networks (LCN)

作者： Ying-Dar Lin Horng-Zhu Lai Yuan-Cheng Lai Department of Computer and Information Science National Chiao Tung University Hsinchu Taiwan National Chiao Tung University Hsinchu TW

ISBN: (纸本)0818676175

Recent advances in cable TV networks and multimedia technologies open the possibilities for network/service/content providers to offer residential customers with video-on-demand services. However, the mass storage system in supporting such services demands proper organization and management. We present a three-level hierarchical network storage architecture for the video-on-demand storage system. At the first-level (local service center, LSC) a limited number of programs with high viewing probabilities are stored while at the second-level (local central service center, LCSC) a few programs with second high viewing probabilities are stored. The third-level (central service center, CSC) contains all programs provided in the system. Based on this architecture and the program viewing probability distribution function, we use a minimum-cost function to find out the number of programs stored in the two service centers (LSC and LCSC) and the number of links among these three service centers. We also describe two program reallocation algorithms which swap programs between service centers according to the change in user request patterns.

关键词： Bandwidth Network servers Spine Costs Computer architecture Computer networks Information science Cable TV multimedia systems Probability distribution

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Digital video analysis and recognition for content-based access

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ACM COMPUTING SURVEYS 1995年第4期27卷 643-644页

作者： Zhang, HJ Tian, Q National Univ. of Singapore

The article focuses on digital video analysis and recognition. Digital video media analysis and recognition (DVMAR) has become an active research topic in multimedia systems and computer vision areas. This is because progress of computer and communication technologies has created strong demand for many applications of digital video in a wide variety of areas, many of which require managing video in a database or information system environment; on the other hand, indexing and retrieval schemes for traditional databases and video manipulation tools in current television systems cannot manage video in an effective, interactive, and content-based manner. The goal of DVMAR is to develop algorithms, tools, and systems to extract and analyze basic elements, features and structures of video so as to make content-based access and transmission of video data feasible and more effective. In general, video media is considered to have the following basic structural elements: shots, scenes, sequences and segments.

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