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IEEE International conference on Sensor Networks, Ubiquitous, and Trustworthy computing

作者： Lau, Seng-Yong Chang, Ting-Hao Hu, Shu-Yu Huang, Hsing-Jung Shyu, Lung-de Chiu, Chui-Ming Huang, Polly Natl Taiwan Univ Dept Elect Engn Grad Inst Networking & Multimedia Taipei Taiwan

ISBN: (纸本)0769525539

With 250,000 NTD invested, 6 man power allocated, and 9 month time elapsed, we present BL-Live. The seemingly dumb, senseless BL Hall at National Taiwan University is transformed to an intelligent office building by a 30+ node sensor network. Two everyday services, Elevator Report and Smart Office, are implemented to better utilize the resources of the building and of the building residents. Our experience allows us to re-examine technical issues such as manufacturing cost, form factor, deployment, data communication, and energy efficiency. Many of the lessons we learn are not only surprising but also inspiring, which in turn leads us to think that more deployment experience and experience sharing are critical to the advances and commercialization of sensor networks.

关键词： Telecommunication networks

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A propagation of virtual space information using a peer-to-peer architecture for Massively Multiplayer Online Games

A propagation of virtual space information using a peer-to-p...

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26th IEEE International conference on Distributed computing Systems Workshops, ICDCS 2006

作者： Ito, Shin Saito, Hiroki Sogawa, Hajime Tobe, Yoshito Dep. of Info. Systems and Multimedia Design Tokyo Denki Univ. Japan Dep. of Info. and Media Engineering Tokyo Denki Univ. Japan

ISBN: (纸本)0769525415

The spread of Massively Multiplayer Online Game (MMOG) which is the multiplayer playing game in virtual space via the Internet is the one of major topic in today's Internet. A typical architecture of MMOG is based on a client-server (C/S) model. Because of the traffic that concentrates at the server, the response time between the server and clients is being increased. In this paper, to overcome this problem, we propose a novel method of propagating information of clients using peer-to-peer (P2P) multicast. In the proposed method, the clients can send their information without broadcasting to each other. © 2006 IEEE.

关键词： Social networking (online)

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Parallel programming models for a multiprocessor SoC platform applied to networking and multimedia

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IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS 2006年第7期14卷 667-680页

作者： Paulin, Pierre G. Pilkington, Chuck Langevin, Michel Bensoudane, Essaid Lyonnard, Damien Benny, Olivier Lavigueur, Bruno Lo, David Beltrame, Giovanni Gagne, Vincent Nicolescu, Gabriela STMicroelectronics Ottawa ON K2H 8R6 Canada Ecole Polytech Montreal PQ H3C 3A7 Canada

The MultiFlex system is an application-to-platform mapping tool that integrates heterogeneous parallel components - H/W or S/W - into a homogeneous platform programming environment. This leads to higher quality designs through encapsulation and abstraction. Two high-level parallel programming models are supported by the following MultiFlex platform mapping tools: a distributed system object component (DSOC) object-oriented message passing model and a symmetrical multiprocessing (SMP) model using shared memory. We demonstrate the combined use of the MultiFlex multiprocessor mapping tools, supported by high-speed hardware-assisted messaging, context-switching, and dynamic scheduling using the StepNP demonstrator multiprocessor system-on-chip platform, for two representative applications: 1) an Internet traffic management application running at 2.5 Gb/s and 2) an MPEG4 video encoder (VGA resolution, at 30 frames/s). For these applications, a combination of the DSOC and SMP programming models were used in interoperable fashion. After optimization and mapping, processor utilization rates of 85%-91% were demonstrated for the traffic manager. For the MPEG4 decoder, the average processor utilization was 88%.

关键词： multimedia computing multiprocessor interconnection parallel programming

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Application-driven cross-layer optimization for mobile multimedia communication using a common application layer quality metric

Application-driven cross-layer optimization for mobile multi...

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2006 International Wireless Communications and Mobile computing conference, IWCMC 2006

作者： Khan, S. Duhovnikov, S. Steinbach, E. Sgroi, M. Kellerer, W. Media Technology Group Technische Universität München Munich Germany DoCoMo Communications Laboratories Europe GmbH Future Networking Lab Munich Germany

ISBN: (纸本)1595933069

This paper proposes a cross-layer optimization framework that provides efficient allocation of wireless network resources across multiple types of applications to maximize network capacity and user satisfaction. We define a novel optimization scheme based on the Mean Opinion Score (MOS) as the unifying metric. Our experiments, applied to scenarios where users simultaneously run three types of applications, such as realtime voice, video conferencing and file download, confirm that MOS-based optimization leads to significant improvement in terms of user perceived quality when compared to throughput-based optimization. Copyright 2006 ACM.

关键词： Video conferencing

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Parallel high-dimensional index structure using cell-based filtering for multimedia data

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ISPA 2006 International conference

作者： Chang, Jae-Woo Kim, Yong-Ki Kim, Young-Jin Chonbuk Natl Univ Dept Comp Eng Jeonju 561756 South Korea

ISBN: (纸本)9783540498605

A large number of high-dimensional index structures suffer from the so called 'dimensional curse' problem, i.e., the retrieval performance becomes increasingly degraded as the dimensionality is increased. To solve this problem, the cell-based filtering scheme has been proposed, but it shows a linear decrease in performance as the dimensionality is increased. In this paper, we propose a parallel high-dimensional index structure using the cell-based filtering for multimedia data so as to cope with the linear decrease in retrieval performance. In addition, we devise data insertion, range query and k-NN query processing algorithms which are suitable for the cluster-based parallel architecture. Finally, we show that our parallel index structure achieves good retrieval performance in proportion to the number of servers in the cluster-based architecture and it outperforms a parallel version of the VA-File when the dimensionality is over 10.

关键词： Parallel architectures

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Slack reclamation for real-time task scheduling over dynamic voltage scaling multiprocessors

Slack reclamation for real-time task scheduling over dynamic...

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IEEE International conference on Sensor Networks, Ubiquitous, and Trustworthy computing

作者： Chen, Jian-Jia Yang, Chuan-Yue Kuo, Tei-Wei Natl Taiwan Univ Grad Inst Networking & Multimedia Dept Comp Sci & Informat Engn Taipei Taiwan

ISBN: (纸本)0769525539

In the past decades, a number of research results have been reported for energy-efficient task scheduling over uniprocessor and multiprocessor environments. While researchers have started the exploring of slack reclaiming for tasks during run time, little work has been done for multiprocessor cases. This paper proposes a set of multiprocessor energy-efficient task scheduling algorithms with different task remapping and slack reclaiming schemes, where tasks have the same arrival time and share a common deadline. Tasks are reassigned to processors dynamically, and the slack time is reclaimed to slow down the execution speeds of the remaining tasks for energy efficiency. Extensive simulations were performed to provide insights. The energy consumption could be reduced up to 29% in the experiments, compared to the previous work.

关键词： slack reclamation energy-efficient scheduling real-time task scheduling multiprocessor scheduling

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Removing the barriers to ubiquitous services : A user perspective

Removing the barriers to ubiquitous services : A user perspe...

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3rd Annual International conference on Mobile and Ubiquitous System - networking and Services

作者： Bush, John Irvine, James Dunlop, John Univ Strathclyde Dept Elect & Elect Engn Glasgow G1 1XQ Lanark Scotland

ISBN: (纸本)9780780397910

An emerging challenge to the realization of ubiquitous, mobile telecommunications is not ostensibly based on any underlying transport or network protocol but on the sheer complexity of technology presented to the user. Common scenarios of future mobile telecommunications often involve multiple devices with varied characteristics and rich and diverse multimedia applications delivered over heterogeneous wireless environments. Most users, however, cannot be expected to appreciate these technologies or participate in its configuration. To address this issue, a user-centric system is proposed that aims to hide complexity from the user. Incorporating concepts of the Personal Distributed Environment [1], the proposed system uses a Personal Assistant Agent to interact with, and react to, the environment and a Personal Content Manager to be aware of content types, device capabilities and manage a user's digital content on behalf of the user.

关键词： component ubiquitous services context aware computing heterogeneous access content management

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Proportional control and deterministic protection of QoS in IEEE 802.11e wireless LAN

Proportional control and deterministic protection of QoS in ...

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IWCMC 2006 - 2006 International Wireless Communications and Mobile computing conference

作者： Tanigawa, Yosuke Kim, Jong-Ok Tode, Hideki Murakami, Koso Department of Information Networking Graduate School of Information Science and Technology Osaka University 1-5 Yamadaoka Suita Osaka 565-0871 Japan

ISBN: (纸本)1595933069

Recently, wireless LAN is achieving remarkable growth, and maturity. On the other hand, by the advance of the Internet, the demand for the multimedia communication services which include video and voice will be expected to grow. Therefore, in the future, the mechanism of QoS guarantee must be realized even in wireless LAN environment. So far, IEEE 802.11e EDCF has been proposed, which is a contention based channel access method to achieve the QoS guarantee in wireless LAN. However, this cannot realize the desired throughput ratio or deterministic target throughput in principle. In this paper, we expand the EDCF to solve such QoS issues and enable more flexible QoS control. Moreover, we show the effectiveness of our proposal by computer simulation. Copyright 2006 ACM.

关键词： Wireless local area networks (WLAN)

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Karaoke callout: Using social and collaborative cell phone networking for new entertainment modalities and data collection

Karaoke callout: Using social and collaborative cell phone n...

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1st ACM Workshop on Audio and Music computing for multimedia, AMCMM'06, co-located with the 2006 ACM International multimedia conference

作者： Shamma, David A. Pardo, Bryan Yahoo Research Berkeley 1950 University Ave Berkeley CA 94704 United States EECS Northwestern University Ford Building 2133 Sheridan Rd. Evanston IL 60208 United States

ISBN: (纸本)1595935010

We have developed a user-trainable query by humming (QBH) system that develops an error probability model of a user's singing. While the training is effective, it is also tedious and time consuming, requiring the user to sing dozens of melodies to the system before the system can be trained. To make training fun, we introduce a new interactive, distributed karaoke game, called Karaoke Callout, played over a cell phone. The user selects a song and sings it into the cell phone. The audio is sent to a server which rates the quality of the singing by measuring how closely it resembles a canonical example of the song stored in the server database, sending a score back to the user. The user may then challenge anyone in the phone's contact list. An SMS text challenge is sent to the challenged person's cell phone. The challenged person sings the song, attempting to better the performance of the challenger. This challenge may then be repeated, with either party selecting a new song with which to "call out" the other party. Over the course of an interaction, numerous examples of each party's singing are created and stored. These may then be used to train a QBH to the idiosyncrasies of each user's singing, as well as providing new query targets for the system. © 2006 ACM.

关键词： Speech processing

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ConEx: Context Exchange in MANETs for Real time multimedia

ConEx: Context Exchange in MANETs for Real time multimedia

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International conference on Systems and International conference on Mobile Communications and Learning Technologies, (ICN/ICONS/MCL) International conference on networking

作者： R.E. Kodikara A. Zaslavsky C. Ahlund Caulfield School of IT Monash University Melbourne Vic Australia Division of Mobile Networking and computing Luleå University of Technology Skellefteå Sweden

MANETs are important and integral part of next generation wireless networking. Real time multimedia communication over MANETs is challenging due to reasons like network topology changes, limitations of wireless links and demanding requirements of multimedia. Channel adaptivity is adopting applications to the dynamic and unpredictable network conditions. QoS adaptivity is adopting lower layers to multimedia application requirements. The novel cross layer context exchange approach called ConEx, presented in this paper improves the efficiency of this two-way information exchange. This paper focuses on adaptive multimedia applications over mobile ad hoc networks, which addresses the challenges of multimedia applications. ConEx uses publish-subscribe event notification system for vertical context exchange across layers of the mobile host and horizontal context exchange across the MANET. ConEx architecture and implementation issues are discussed in this paper.

关键词： Mobile ad hoc networks Intelligent networks Computer networks Mobile communication Peer to peer computing Mobile computing multimedia communication Network topology Cross layer design Context

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