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12th IFIP/IEEE International conference on Management of multimedia and Mobile Networks and Services, MMNS 2009

ISBN: (纸本)3642049931

The proceedings contain 20 papers. The special focus in this conference is on multimedia networks and systems management, multimedia quality, VoIP and vocal applications and Peer-to-Peer multimedia networks. The topics include: Design of an online charging system to support IMS-Based inter-domain composite services;telecom network and service management;on-demand multicast streaming using collaborative prefix caching;quality adaptive Peer-to-Peer streaming using scalable video coding;modeling of a QoS matching and optimization function for multimedia services in the NGN;a novel bandwidth estimation algorithm for multimedia services over IEEE 802.11 wireless networks;a cost function for QoS-Aware routing in multi-tier wireless multimedia sensor networks;QoE assessment of VoIP in next generation networks;a parametric vocal quality assessment algorithm over transient connections;architecture for managing voice-application access to web resources;a robust algorithm for the membership management of super-peer overlay;an evaluation criterion for adaptive neighbor selection in heterogeneous Peer-to-Peer networks;improving performance of ALM systems with bayesian estimation of peers dynamics;quality of service for multicasting in content addressable networks;an architecture for IMS services using open source infrastructure;data aggregation scheme for a multi-application WSN;context-aware IPTV and cooperative prefetching strategy for P2P video-on-demand system.

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Efficient Top-k Query algorithms Using K-Skyband Partition

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4th International ICST conference - INFOSCALE 2009

作者： Gong, Zhenqiang Sun, Guang-Zhong Yuan, Jing Zhong, Yanjing Univ Sci & Technol China MOE MS Key Lab Multimedia Comp & Commun Sch Comp Sci & Technol Hefei 230027 Peoples R China

ISBN: (纸本)9783642104848

Efficient processing of top-k queries has become a classical research area. Fagin et al. proposed the "middleware cost" for a top-k query algorithm. In some scenario, there is no way to perform a random access, and Fagin et al. proposed NRA (No Random access) algorithm for that. In this paper, we investigate the intrinsic relation between top-k queries and K-skyband queries. Based on that relation, we propose a novel algorithm DNRA (Dominate-NRA). The main idea of DNRA is to partition the original dataset into two sub-datasets depending on whether they belong to K-skyband or not. We prove that DNRA performs no more sorted accesses than NRA on any dataset. Furthermore, we partition the dataset into N sub-datasets (N is the number of objects in the dataset), and then we propose our algorithm ADNRA (Advanced-DNRA). The partition of the dataset is pre-computed, and we discuss two techniques to fulfill it. Extensive experiments show that our algorithms perform several orders of magnitude fewer accesses than NRA and that ADNRA performs significantly fewer accesses than DNRA on some datasets.

关键词： Top-k Queries K-skyband Queries NRA Algorithm Dominate

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Design of cluster-based system framework for SIP-based multimedia conferencing services

Design of cluster-based system framework for SIP-based multi...

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NCM 2009 - 5th International Joint conference on Int. Conf. on Networked Computing, Int. Conf. on Advanced Information Management and Service, and Int. Conf. on Digital content, multimedia Technology and its Applications

作者： Su, Hui-Kai Hsiao, Wen-Hsu Lin, Yu-Kai Chen, Kim-Joan Wu, Cheng-Shong Department of Electrical Engineering National Formosa University No.64 Wenhua Rd. Huwei Township Yunlin County 632 Taiwan Dept. of Communications Engineering National Chung-Cheng University No. 168 University Rd. Min-Hsiung Chia-Yi 621 Taiwan

ISBN: (纸本)9780769537696

multimedia conferencing is a communicatioa service to approach multi-party, real-time, interactive and multimedia applications. Due to mature Internet technologies and ubiquitous network access services, more and more Internet applications about real-time multimedia conferencing are used. In the current conferencing systems, the media processing in centralized mixer servers is the system bottleneck. The communication quality will be decreased because of the central system loading. This paper proposes a cluster-based framework to provide a SIP-based multimedia conferencing service. In this framework, the cluster members are self-organizing and self-maintaining to share the resources of mixers within the cluster. Additionally, the extended SIP messages and SIP-based clustering mechanism are designed in this paper. Thus, if the resources of the mixers can be allocated in an optimal planning, the mixer loading can be distributed well to each mixer in the duster. The system requirements of super- performance mixer servers can be avoided. In the framework, not only the system loading of conference servers can be distributed well, but also the infrastructure cost can be reduced. © 2009 IEEE.

关键词： Mixers (machinery)

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Optimizing File Retrieval in Delay-Tolerant content Distribution Community

Optimizing File Retrieval in Delay-Tolerant Content Distribu...

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29th IEEE International conference on Distributed Computing systems

作者： Huang, Ying Gao, Yan Nahrstedt, Klara He, Wenbo Univ Illinois Dept Comp Sci 1304 W Springfield Ave Urbana IL 61801 USA Univ New Mexico Dept Comp Sci Albuquerque NM 87131 USA

ISBN: (纸本)9781424444816

In WiFi-based content distribution community infrastructure (CDCI), file servers are deployed in diverse locations around cities, caching popular files interesting to a community. They serve file download requests from mobile users in proximity via WiFi. In this paper, we study the optimal caching strategy for file servers in CDCI so that file retrieval probability within deadline is maximized, subject to storage constraint of each file server The optimal caching strategy depends on many factors, such as users' mobility patterns, access point topology, file popularity, etc. We have formalized this content management problem as a mixed integer optimization problem. Because of NP-hardness and a large variable space of this optimization problem, we propose a heuristic algorithm MobaSsign to allocate file blocks. Extensive experiments show that our heuristic caching strategy, considering mobility patterns improves the file retrieval probability within deadline.

关键词： Heuristic algorithms

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A multimedia delivery architecture for IPTV with P2P-based time-shift support

A multimedia delivery architecture for IPTV with P2P-based t...

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2009 6th IEEE Consumer Communications and Networking conference, CCNC 2009

作者： Gallo, Diego Miers, Charles Coroama, Vlad Carvalho, Tereza Souza, Victor Karlsson, Per Escola Politécnica University of São Paulo São Paulo SP Brazil Packet Systems Ericsson Research Stockholm Sweden

ISBN: (纸本)9781424423095

From the four basic functionalities of video delivery systems - linear TV, Video on Demand (VoD), time-shifted TV (tsTV), and network Personal Video Recorder (nPVR) - most of today's solutions focus either on linear TV, or on VoD. While linear TV usually uses efficient distribution mechanisms such as multicast, VoD is often realized via centralized, bandwidth-inefficient unicast. Even when file sharing P2P algorithms are used for VoD or nPVR, they can not be applied to tsTV since they require the whole content to exist from the beginning. With this paper, we propose a novel solution that aims at offering all four functionalities in one distributed system. Our architecture uses multicast for the distribution of live content, and a modified P2P protocol for offering VoD, nPVR, and tsTV altogether. ©2009 IEEE.

关键词： Video on demand

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Broadcasting and personalization of user-generated contents in DVB-H mobile networks

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multimedia systems 2009年第3期15卷 173-185页

作者： Blanco-Fernandez, Yolanda Pazos-Arias, Jose J. Gil-Solla, Alberto Ramos-Cabrer, Manuel Lopez-Nores, Martin Univ Vigo ETSE Telecomunicac Vigo 36310 Spain

During the last years, we have witnessed the boom of the digital market due to the proliferation of emergent audiovisual services and the increasing number of broadband networks. In this scenario, users insistently demand innovative services for exchanging and sharing their own audiovisual contents. In order to meet these needs, in this paper, we propose a system that broadcasts user-generated audiovisual contents for handheld devices in a mobile network based on the DVB-H broadcasting standard. Besides, our system offers diverse value-added services to these new active users, such as: (1) annotation, sharing and personalized distribution of audiovisual contents, (2) multi modal access, via Web or by client applications running locally in the handheld device, and (3) exploitation of return channels to transmit interactive contents that enhance the user's experience. To achieve these goals, our system adopts well-known technologies for broadcasting and semantic annotation of audiovisual contents, as well as emergent technology from Web 2.0 and Semantic Web. We have carried out tests involving a group of students from the University of Vigo, who were satisfied with the personalization capabilities offered by our TV system for mobile settings.

关键词： Mobile TV Web 2.0 DVB-H Personalization User-generated content Interactivity

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Optimizing file retrieval in delay-tolerant content distribution community

Optimizing file retrieval in delay-tolerant content distribu...

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2009 29th IEEE International conference on Distributed Computing systems Workshops, ICDCS, 09

作者： Ying, Huang Yan, Gao Nahrstedt, Klara Wenbo, He Department of Computer Science University of Illinois Urbana-Champaign IL United States Department of Computer Science University of New Mexico United States

ISBN: (纸本)9780769536606

In WiFi-based content distribution community infrastructure (CDCI), file servers are deployed in diverse locations around cities, caching popular files interesting to a community. They serve file download requests from mobile users in proximity via WiFi. In this paper, we study the optimal caching strategy for file servers in CDCI so that file retrieval probability within deadline is maximized, subject to storage constraint of each file server. The optimal caching strategy depends on many factors, such as users' mobility patterns, access point topology, file popularity, etc. We have formalized this content management problem as a mixed integer optimization problem. Because of NP-hardness and a large variable space of this optimization problem, we propose a heuristic algorithm MobaSsign to allocate file blocks. Extensive experiments show that our heuristic caching strategy considering mobility patterns improves the file retrieval probability within deadline. © 2009 IEEE.

关键词： Heuristic algorithms

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Development of RTLS access point allocation prototype for location tracking in construction sites: With focus on bridge construction project

Development of RTLS access point allocation prototype for lo...

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作者： Kang, Nam-Gi Park, Jae-Sun Hong, Tae-Min Eo, Yang-Dam Lee, Byoung-Kil Pyeon, Mu-Wook Department of Advanced Technology Fusion Konkuk University Seoul Korea Republic of Department of Civil Engineering Kyonggi University Seoul Korea Republic of LoDiCS Seoul Korea Republic of

ISBN: (纸本)9780769537696

This paper focuses on the development of AP (access Points) allocation simulation programs intended to enable deployment of RTLS (Real Time Location System) in construction sites. This study aims to develop a simulation program that specifies the minimum number of APs (access Points) and optimizes their locations. AP is a critical element in location-tracking systems in construction sites in reference to acquired 3D spatial data of structures under construction using terrestrial LiDAR, state-of-the-art field surveying technique. Achievement made herein will provide a platform for real-time monitoring system in construction sites that tracks locations of various construction resources (equipment, material, labor, etc.) and contributes to the improvement of efficiency and safety in construction projects. © 2009 IEEE.

关键词： Tracking (position)

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Semantics-driven multimedia data access

Semantics-driven multimedia data access

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International conference on Information Technology Interfaces

作者： Marian Dardala Adriana Reveiu Ion Smeureanu Academy of Economic Studies Romania

The multimedia data are more present in the actual informatics systems. Because of characteristics of multimedia data, their management and querying techniques are unlike than those of traditional data. We can increase the potential use of multimedia data across various applications by assuring semantics-driven access to multimedia data. In this paper we propose a solution, based on MPEG-21 standard, to describe the multimedia content and to integrate it with the semantic web.

关键词： multimedia databases Streaming media Humans multimedia systems Semantic Web Video sequences Ontologies Power generation economics Internet content based retrieval

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Virtualization as a Strategy for Maintaining Future access to multimedia content

Virtualization as a Strategy for Maintaining Future Access t...

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International conference on Advances in multimedia, MMEDIA

作者： Knut Holmqvist Till Halbach Thor Kristoffersen Norwegian Computing Centre Oslo Norway

Virtualization and emulation techniques are getting better and better, and it feels thus natural to apply them to address the problem of data preservation for future content access. In this paper, we virtualized a number of existing servers and clients and ran the virtual machines under VMware's hypervisor. Not all of the investigated operating systems could be virtualized successfully, and even with successful conversions often settings had to be reconfigurated, and support for particular devices had to be added manually. It is concluded that many operating systems are not flexible enough to allow for a problem-free conversion to a virtual machine.

关键词： Operating systems Emulation Application software Virtual machining Physics computing Virtual machine monitors Hardware multimedia computing DVD Computer architecture

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