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96 ENTERPRISE INFORMATION SYSTEMS VI 10 CONCLUSIONS The service-oriented architecture is a very powerful and in many areas a quite new paradigm. There are, however, several issues to be solved yet: 1. Education of people to be able to use service orientation properly. Service orientation is not any simple and straightforward modification of the objectoriented techniques and object-oriented philosophy. 2. Design patterns as well as new tools of modeling are not available yet. 3. The SOA influences the specification of requirements more substantially than other architectures do. 4. The collaboration of users (including their top management) with developers as well as users involvement should be tighter than before. 5. The developers should have a deeper knowledge of the user problem and knowledge domain. Important issues are the prejudices of software developers like insisting on full computerization, belief that users are too stupid to take part in requirements specifications, etc. Service orientation is, however, today already an attitude promising to develop software of the quality known from the other branches of industry. Supported by the Czech Science Foundation, grant No. 201/02/1456. REFERENCES Barry and Associates (2003). http://www.servicearchitecture.com. Brown, W. J., Malveau, R. C., Hays W. ”Skip” McCormick, I., and Mowbray, T. J. (1998). AntiPatterns: Refactoring Software, Architectures, and Projects in Crisis. John Wiley & Sons, New York. Donnay Software Designs (1999). Mature, portable, datadriven systems. http://www.dclip.com/datadr.htm. Jablonski, S. and Petrov, I. (2003). Web services, workflow and metadata management as the integration means in the electronic collaboration era. Tutorial at the ICEIS’03 conference. Jacobson, I. and et all (1995). Object Oriented Software Engineering: A Use Case Driven Approach. Addison Wesley. Kopeček, P. (2003). Private communication. Král, J. (1998). Informační Systémy, (Information Systems, in Czech). Science, Veletiny, Czech Republic. Král, J. and Demner, J. (1979). Towards reliable real time software. In Proceedings of IFIP Conference Construction of Quality Software, pages 1–12, North Holland. Král, J., Čern´y, J., and Dvoˇrák, P. (1987). Technology of FMS control software development. In Menga, G. and Kempe, V., editors, Proceedings of the Workshop on Information in Manufacturing Automation, Dresden. Král, J. and ˇZemlička, M. (2002). Autonomous components. In Hamza, M. H., editor, Applied Informatics, pages 125–130, Anaheim. ACTA Press. Král, J. and ˇZemlička, M. (2003a). Software confederations and alliances. In CAiSE’03 Forum: Information Systems for a Connected Society, Maribor, Slovenia. University of Maribor Press. Král, J. and ˇZemlička, M. (2003b). Software confederations and manufacturing. In Camp, O., Filipe, J., Hammoudi, S., and Piattini, M., editors, ICEIS 2003: Proceedings of the Fifth International Conference on Enterprise Information Systems, volume 3, pages 650– 653, Setúbal. EST Setúbal. Král, J. and ˇZemlička, M. (2004a). Architecture, specification, and design of service-oriented systems. In reviewing process. Král, J. and ˇZemlička, M. (2004b). Service orientation and the quality indicators for software services. Accepted for EMCSR’04 in Vienna. Král, J. and ˇZemlička, M. (2004c). Systemic of human involvement in information systems. Technical Report 2, Charles Univerity, Faculty of Mathematics and Physics, Department of Software Engineering, Prague, Czech Republic. Object Management Group (2001). Unified modeling language. http://www.omg.org/ technology/documents/formal/ uml.htm. Rumbaugh, J., Blaha, M., Premerlani, W., Eddy, F., and Lorensen, W. (1991). Object-Oriented Modeling and Design. Prentice-Hall, Englewood Cliffs, New Jersey 07632. Skula, J. (2001). Private communication. Sneed, H. (2002). Position statement at panel discussion at CSMR 2002, Budapest, Hungary. T˚uma, P. (2003). Modern software architectures: Novel solutions or old hats? In Popelínsk´y, L., editor, DATAKON 2003, pages 151–162, Brno, Czech Republic. Masaryk University. W3 Consortium (1999). Resource description framework. A proposal of W3C Consortium. http://www.w3.org/RDF/. W3 Consortium (2002). Web services activity. http://www.w3.org/2002/ws/ – as visited on 31st October 2003. Yourdon, E. (1988). Modern Structured Analysis. Prentice- Hall, 2nd edition.
MEMORY MANAGEMENT FOR LARGE SCALE DATA STREAM RECORDERS ∗ Kun Fu and Roger Zimmermann Integrated Media System Center University of Southern California Los Angeles, California 90089 Email: [kunfu,rzimmerm]@usc.edu Keywords: Memory management, real time, large-scale, continuous media, data streams, recording. Abstract: Presently, digital continuous media (CM) are well established as an integral part of many applications. In recent years, a considerable amount of research has focused on the efficient retrieval of such media. Scant attention has been paid to servers that can record such streams in real time. However, more and more devices produce direct digital output streams. Hence, the need arises to capture and store these streams with an efficient data stream recorder that can handle both recording and playback of many streams simultaneously and provide a central repository for all data. In this report we investigate memory management in the context of large scale data stream recorders. We are especially interested in finding the minimal buffer space needed that still provides adequate resources with varying workloads. We show that computing the minimal memory is an NP-complete problem and will require further study to discover efficient heuristics. 1 INTRODUCTION Digital continuous media (CM) are an integral part of many new applications. Two of the main characteristics of such media are that (1) they require real time storage and retrieval, and (2) they require high bandwidths and space. Over the last decade, a considerable amount of research has focused on the efficient retrieval of such media for many concurrent users (Shahabi et al., 2002). Algorithms to optimize such fundamental issues as data placement, disk scheduling, admission control, transmission smoothing, etc., have been reported in the literature. Almost without exception these prior research efforts assumed that the CM streams were readily available as files and could be loaded onto the servers offline without the real time constraints that the complementary stream retrieval required. This is certainly a reasonable assumption for many applications where the multimedia streams are produced offline (e.g., movies, commercials, educational lectures, etc.). However, the current technological trends are such that more and more sensor devices (e.g., cam- ∗ This research has been funded in part by NSF grants EEC-9529152 (IMSC ERC) and IIS-0082826, and an unrestricted cash gift from the Lord Foundation. I. Seruca et al. (eds.), Enterprise Information Systems VI, © 2006 Springer. Printed in the Netherlands. 97 97–106. eras) can directly produce digital data streams. Furthermore, many of these new devices are networkcapable either via wired (SDI, Firewire) or wireless (Bluetooth, IEEE 802.11x) connections. Hence, the need arises to capture and store these streams with an efficient data stream recorder that can handle both recording and playback of many streams simultaneously and provide a central data repository. The applications for such a recorder start at the low end with small, personal systems. For example, the “digital hub” in the living room envisioned by several companies will in the future go beyond recording and playing back a single stream as is currently done by TiVo and ReplayTV units (Wallich, 2002). Multiple camcorders, receivers, televisions, and audio amplifiers will all connect to the digital hub to either store or retrieve data streams. An example for this convergence is the next generation of the DVD specification that also calls for network access of DVD players (Smith, 2003). At the higher end, movie production will move to digital cameras and storage devices. For example, George Lucas’ “Star Wars: Episode II Attack of the Clones” was shot entirely with high-definition digital cameras (Huffstutter and Healey, 2002). Additionally, there are many sensor networks that produce continuous streams of
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vi TABLE OF CONTENTS PART 1 - DATAB
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viii TABLE OF CONTENTS A WIRELESS A
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CONFERENCE COMMITTEE Honorary Presi
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Hung, P. (AUSTRALIA) Jahankhani, H.
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Invited Papers
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2 ENTERPRISE INFORMATION SYSTEMS VI
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10 ENTERPRISE INFORMATION SYSTEMS V
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EVOLUTIONARY PROJECT MANAGEMENT: MU
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MANAGING COMPLEXITY OF ENTERPRISE I
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148 ENTERPRISE INFORMATION SYSTEMS
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AN EXPERIENCE IN MANAGEMENT OF IMPR
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ANALYSIS AND RE-ENGINEERING OF WEB
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Module p0 Customer Itinerary Send I
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departments: the marketing dept. se
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• An acyclic module M is usable,
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BALANCING STAKEHOLDER’S PREFERENC
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The scenarios will provide an abstr
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BALANCING STAKEHOLDER'S PREFERENCES
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BALANCING STAKEHOLDER'S PREFERENCES
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A POLYMORPHIC CONTEXT FRAME TO SUPP
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A POLYMORPHIC CONTE XT FRAME TO SUP
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FEATURE MATCHING IN MODEL-BASED SOF
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combination of solution domains - a
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• features for all the concepts:
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Existence In both steps it is possi
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matching strategies are maximal, mi
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TOWARDS A META MODEL FOR DESCRIBING
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elementary message (ae-message) can
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problems on a pragmatic level, whic
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TOWARDS A META MODEL FOR DESCRIBING
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INTRUSION DETECTION SYSTEMS USING A
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INTRUSION DETECTION SYSTEMS USING A
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(k� 1) (k) (k�1) (k) p � w
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Table 5: Performance Comparison of
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A USER-CENTERED METHODOLOGY TO GENE
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carries out the second phase of the
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1 1 1 1 2 PROCESS STORE ENTITY EDGE
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constraints rules. KOGGE (Ebert et
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PART 4 Software Agents and Internet
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CABA 2 L A BLISS PREDICTIVE COMPOSI
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y disables evidencing severe mental
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Figure 4: Symbols emission in DAR-H
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they evidence a generalization erro
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A METHODOLOGY FOR INTERFACE DESIGN
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and mobility loss coupled with redu
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Tradeoff: The default input is poss
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Sessions on the VABS which are held
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A CONTACT RECOMMENDER SYSTEM FOR A
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A CONTACT RECOMMENDER SYSTEM FOR A
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- "Going to the sources". The user
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Here are the matrix W and P for our
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EMOTION SYNTHESIS IN VIRTUAL ENVIRO
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theme turns out to be surprisingly
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6 FROM FEATURES TO SYMBOLS 6.1 Face
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sions are described by different em
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Electronic Imaging 2000 Conference
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to the accessibility problem for th
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Figure 3: Hierarchical View of the
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4 CONCLUSIONS AND FUTURE WORK On th
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PERSONALISED RESOURCE DISCOVERY SEA
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profile, the user defines his curre
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Abdelkafi, N. .....................
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