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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems"

共 2015 条记录，以下是1521-1530 订阅

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Q-bridge: A QoS enabled bridging model for 802.11 access point

Q-bridge: A QoS enabled bridging model for 802.11 access poi...

引用

57th IEEE Semiannual Vehicular Technology conference (VTC2003)

作者： Tang, Ming-Chung Tung, Li-Ping Shih, Wei-Kuan Dept. of Computer Science National Tsing-Hua University Hsin-Chu City 300 Taiwan

The rapid growth of wireless LAN-enabled devices over recent years has generated a successful framework for wireless data accessing. It seems viable to expand the framework as part of last mile solution for mobile users to access data services. Therefore, in this paper, we further focus on Quality of Service (QoS) and timeliness issues for supporting advanced multimedia applications in such environments. A bridging model, named Q-Bridge, is proposed in the paper for layer-2 access points to exhibiting QoS and real-time packet scheduling capabilities in the last mile configuration. The model explicitly applies the imprecise computation technique. That is, each bridged packet can be logically divided into two portions: a mandatory portion and an optional portion. The mandatory portions must be scheduled to transmit by their deadlines while the optional portions can be chopped to meet their deadlines or QoS requirements. By taking advantage of this model and the scheduling algorithms we devised, wireless data services can benefit from QoS and timeliness guarantees provided by access points supporting Q-Bridge at the last mile.

关键词： Wireless telecommunication systems

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Indexing high-dimensional data for content-based retrieval in large databases 8

Indexing high-dimensional data for content-based retrieval i...

引用

8th International conference on Database systems for Advanced Applications

作者： Fonseca, MJ Jorge, JA Univ Tecn Lisboa IST ID INESCDept Informat Syst & Comp Sci P-1000029 Lisbon Portugal

ISBN: (纸本)0769518958

Many indexing approaches for high-dimensional data points have evolved into very complex and hard to code algorithms. Sometimes this complexity is not matched by increase in performance. Motivated by these ideas, we take a step back and look at simpler approaches to indexing multimedia data. In this paper we propose a simple, (not simplistic) yet efficient indexing structure for high-dimensional data points of variable dimension, using dimension reduction. Our approach maps multidimensional points to a ID line by computing their Euclidean Norm and use a B+-Tree to store data points. We exploit B+-Tree efficient sequential search to develop simple, yet performant methods to implement point, range and nearest-neighbor queries. To evaluate our technique we conducted a set of experiments, using both synthetic and real data. We analyze creation, insertion and query times as a function of data set size and dimension. Results so far show that our simple scheme outperforms current approaches, such as the Pyramid Technique, the A-Tree and the SR-Tree, for many data distributions. Moreover our approach seems to scale better both with growing dimensionality and data set size, while exhibiting low insertion and search times.

关键词： Computer science content based retrieval Data structures Image databases Indexing Information retrieval Information systems Nearest neighbor searches Spatial databases Technical drawing

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Distributed content-aware Request Distribution in Cluster-based Web Servers

Distributed Content-aware Request Distribution in Cluster-ba...

引用

Parallel and Distributed Computing, Applications and Technologies, PDCAT 2003 Proceedings

作者： Du, Zeng-Kai Ju, Jiu-Bin Department of Computer Science Jilin University Changchun 130012 China

ISBN: (纸本)0780378407

While content-aware distribution policies getting more popular in cluster-based web systems, they make the dispatching node a bottleneck. To achieve scalable server performance, we present a completely distributed architecture in which all hosts participate in request dispatching. To cope with the architecture, we propose a distributed dispatching policy named DWARD. With DWARD, all the server nodes may participate in request dispatching on the basis of local access pattern. In addition, the DWARD policy inherits several desirable features of the centralized algorithms, including load balance, high locality and less forwarding overhead. Finally, a testbed is implemented on the basis of Linux kernel to benchmark various dispatching algorithms. The performance results show that DWARD can achieve favorable throughput compared with state-of-the-art dispatching policies.

关键词： Client server computer systems

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Mediaviews: A layered view mechanism for integrating multimedia data

引用

9th International conference on Object-Oriented Information systems, OOIS 2003

作者： Kim, Hyon Hee Park, Seung Soo Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Department of Computer Science IPVS University of Stuttgart Stuttgart Germany

ISBN: (纸本)3540408606

Recently, advanced Web-based applications require integrated access to diverse types of multimedia data such as images, video clips, and audios. To help development of these applications, it is necessary to integrate heterogeneous multimedia data from disparate sources into a single data warehouse. In this paper, we propose a novel view mechanism for integrating multimedia data. First, we design a common data model called the XML/M and develop a view definition language called the XQuery/M. The XML is extended to describe multimedia contents and to capture semantic relationships among multimedia objects. The XQuery language is also extended to access, edit, and update multimedia contents. Second, we develop a layered view mechanism composed of intra-media views and inter-media views to support user queries efficiently. Finally, we suggest a rule-based view maintenance technique. We show that how the Mediaviews mechanism generates user-centered views and manages changes from underlying data sources. Our approach provides semantics-based integration and content-based retrieval of multimedia data. © Springer-Verlag Berlin Heidelberg 2003.

关键词： XML

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Parallel access to Multiple Internet Mirror Sites

Parallel Access to Multiple Internet Mirror Sites

引用

2003 IEEE Pacific Rim conference on Communications Computers and Signal Processing (PACRIM 2003)

作者： Abdel-Hamid, Yousry S. Gulliver, T. Aaron Dept. of Electrical Engineering University of Victoria STN CSC P. O. Box 3055 Victoria BC V8W 3P6 Canada

Downloading a large file through a heavily congested link can be difficult and frustrating, especially with frequent software updates and multimedia content. A common approach employed on the Internet is to utilize mirror sites. Luby et al proposed a new class of erasure codes for mirror site systems called Tornado codes. Tornado codes typically have much faster decoding times than Reed-Solomon (RS) codes. In this paper, we present an extensive study of the behavior of multiple mirror site systems. OPNET is employed to do a comparison study of system performance using RS and Tornado codes.

关键词： Internet

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1st International Workshop on multimedia Interactive Protocols and systems, MIPS 2003

引用

1st International Workshop on multimedia Interactive Protocols and systems, MIPS 2003

ISBN: (纸本)3540205349

The proceedings contain 34 papers. The special focus in this conference is on Wireless multimedia systems, Communication Protocols for multimedia, Scheduling Issues and Quality of Service Architectures. The topics include: The impact of wireless device access on content delivery networks;adaptive access regulation for VBR video streams;packetization scheme for streaming high-quality audio over wireless links;preserving established communications in ipv6 multi-homed sites with MEX;observations on equation-based estimation of TCP-compatible rate for multi-rate multicast scenarios;smoothing the TCP rate by learning the delay versus window size dependency;KOM scengen the Swiss army knife for simulation and emulation experiments;the effect of per-input shapers on the delay bound in networks with aggregate scheduling;scheduling and quality differentiation in differentiated services;size-distortion optimized proxy caching for robust transmission of mpeg-4 video;design and performance evaluation of a price-based cache algorithm for mobile web services;admission control and resource reservation framework for the OMODIS QOS framework;performance evaluation of the preemptive bandwidth allocation protocol;impact of network topology on the performance of budget based network admission control methods;breaking the network transparency paradigm;quality differentiation with source shaping and forward error correction;enhancing the coexistence of unicast and multicast sessions in diffserv architecture;session sharing as middleware service for distributed multimedia applications and spatio-temporal QOS pattern analysis in large scale internet environment.

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Proceedings of the Asia and South Pacific Design Automation conference, ASP-DAC

Proceedings of the Asia and South Pacific Design Automation ...

引用

Asia and South Pacific Design Automation conference, ASP-DAC 2003

ISBN: (纸本)0780376595

The proceedings contain 157 papers. The topics discussed include: irredundant address bus encoding techniques based on adaptive codebooks for low power;multi-parametric improvements for embedded systems using code-placement and address bus coding;memory access pattern analysis and stream cache design for multimedia applications;a statistical gate delay model for intra-chip and inter-chip variabilities;a fast and accurate method for interconnect current calculation;energy minimization of real-time tasks on variable voltage processors with transition energy overhead;register aware scheduling for distributed cache clustered architecture;data partitioning for maximal scratchpad usage;logic verification based on diagnosis techniques;algorithms for compacting error traces;typing abstractions and management in a component framework;approximate formulae approach for efficient inductance extraction;accurate prediction of the impact of on-chip inductance on interconnect delay using electrical and physical parameters;and a metric for analyzing effective on-chip inductive coupling.

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SIR-dependent scheduling and static power preallocation for TDMA-based multi-cell wireless packet networks 4

SIR-dependent scheduling and static power preallocation for ...

引用

Joint conference of the 4th International conference on Information, Communications and Signal Processing/4th Pacific-Rim conference on multimedia (ICICS-PCM 2003)

作者： Veronesi, R Tralli, V Univ Ferrara Dipartimento Ingn I-44100 Ferrara Italy

ISBN: (纸本)0780381858

We introduce here a new class of packet scheduling techniques for TDMA-based (pure or hybrid) cellular packet radio networks with full frequency reuse. These algorithms, which are suited for networks with both centralized and distributed control, assign the available resources according to the SIR predicted at each slot of the frame. Partial prediction of the interference is made possible by the static pre-assignment in each cell of a maximum transmitted power level to each slot of the frame. This technique, also named power shaping, exploits a set of suitably reused power profiles to partially organize the intercell and intersector interference in the available slots. Unlike traditional channel state dependent scheduling techniques, which are not able to deal with quasi-stationary location-dependent radio channel conditions, the proposed method is able to provide channel resources with different levels of SIR inside the frame, even in stationary environments, and to assign them to the packets waiting for service. We show that these techniques are able to increase the capacity of systems with and without centralized resource management control, while maintaining the capability of providing acceptable quality of service to heterogeneous classes of users.

关键词： Time division multiple access

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IFIP TC11 / WG11.3 16th Annual conference on Data and Applications Security

IFIP TC11 / WG11.3 16th Annual Conference on Data and Applic...

引用

IFIP TC11/WG11.3 16th Annual conference on Data and Applications Security

ISBN: (纸本)9781475764130

The proceedings contain 25 papers. The special focus in this conference is on Role-based access Control, Database Security, XML Security, Data Mining and Inference, multimedia System Security, Network Security, Public Key Infrastructure, Formal Methods and Protocols, and Security and Privacy. The topics include: Shielding RBAC infrastructures from cyberterrorism;privilege administration for the role graph model;implementing RBAC policies;role delegation for a resource-based security model;implementing workflow systems;multiphase damage confinement system for databases;analyzing transaction logs for effective damage assessment;deductive database security;towards secure XML federations;distributed cooperative updates of XML documents;on security and privacy risks in association mining algorithms;mining malicious corruption of data with hidden Markov models;a study of inference problems in distributed databases;uniform indexing for geospatial data and authorizations;access control of SVG documents;on modeling computer networks for vulnerability analysis;on-line intrusion protection by detecting attacks with diversity;a technique to improve services in PKI;implementation and verification of programmable security;a process algebraic approach to security policies;anonymous and secure multicast subscription and privacy and civil liberties.

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Proceedings 17th International conference on Advanced Information Networking and Applications. AINA 2003

Proceedings 17th International Conference on Advanced Inform...

引用

International conference on Advanced Information Networking and Applications (AINA)

The following topics are dealt with: advanced information networking; wireless and mobile systems; QoS; flexible systems; distributed systems; multimedia applications; fault tolerant systems; network management; performance evaluation; multiple access; multimedia presentation and synchronization; network security; mobile computing; network analysis; multiplexing; modulation; coding; multi-agent systems; network protocols; Web applications; ad-hoc networks; performance evaluation; wireless network protocols; multimedia information systems; distributed algorithms; satellite systems; resource allocation; scheduling; ad-hoc network analysis; database models; spread spectrum and phase estimation; secure systems; agent-based systems; distributed and parallel applications; reliable systems; traffic control; bandwidth allocation; security control and detection systems; handoff algorithms; switching; routing; e-learning; and compression algorithms.

关键词： Mobile communication multimedia systems Communication system operations and management Data security Multiplexing Modulation Protocols Internet Distributed algorithms Satellite communication Resource management Scheduling Communication system routing Database management systems Spread spectrum communication

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