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1st International Black Sea conference on Communications and networking (BlackSeaCom)

作者： Gur, Gurkan Alagoz, Fatih Bogazici Univ SATLAB Dept Comp Engn Istanbul Turkey

ISBN: (纸本)9781479908578

An energy efficiency based model of content-based access schemes for multi-radio mobile user devices is developed. The content is layered video consumed by the end device. The mobile devices are assumed to have an "asymmetric" interface structure: a satellite interface and a terrestrial interface for wireless multimedia networking. The terrestrial interface utilizes multi-hop transmission with opportunistic access schemes while the satellite interface provides a lower bitrate but simpler and less power-hungry transmission.

关键词： mobile computing mobile radio multimedia communication telecommunication power management

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Trust Service Selection in Pervasive computing

Trust Service Selection in Pervasive Computing

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1st International conference on multimedia Information networking and Security (MINES 2009)

作者： Wang, Xiaoying Chen, Yingge Xu, Benlian Changshu Inst Technol Dept Comp Sci Changshu 215500 Peoples R China

ISBN: (纸本)9780769538433

This paper describes the establishment and estimation of trust relation, and put forward a kind of trust service selection model in pervasive computing environment. Through direct and indirect trust relation evaluation, preference adjustment and trust update, a sound trust service evaluation system is set up which has been tested in smart UPS network system and shows a better performance.

关键词： pervasive computing service selection trust

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IP Packet Header Compression and User Grouping for LTE multimedia Broadcast Multicast Services

IP Packet Header Compression and User Grouping for LTE Multi...

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International conference on computing, networking and Communications (ICNC)

作者： Jiang, Chen Wu, Wenhao Ding, Zhi Univ Calif Davis Dept Elect & Comp Engineer Davis CA 95616 USA

ISBN: (纸本)9781509045884

multimedia Broadcast Multicast Service (MBMS)(1) is an efficiency cellular strategy for shared content delivery, widely popular in Long Term Evolution (LTE) networks. Typical multimedia IP packets possess redundantly large headers, relying on Robust Header Compression (ROHC) for efficiency boost. This work investigates the adaptation of ROHC schemes for MBMS. We formulate and solve the optimization problem of transmission efficiency maximization in point-to-multipoint (P-t-M) transmission mode. Based on this solution, we propose a new MBMS scheme, namely point-to-multigroup (P-t-MG) transmission in which MBMS aim user groups. We provide a grouping and parameter optimization algorithm for P-t-MG to achieve high efficiency under total radio resource constraints. Numerical results demonstrate the advantage of the optimized P-t-M and the P-t-MG schemes over conventional MBMS.

关键词： Optimization Markov processes Context Computational modeling Channel models Synchronization Wireless communication multimedia broadcast multicast service channel model CARRIER SYSTEM Computational modeling Markov chain User groups Header Long Term Evolution Local thermodynamic equilibrium IP packet

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A Failure Recovery Framework for Job Management Services

A Failure Recovery Framework for Job Management Services

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4th International conference on multimedia Information networking and Security (MINES)

作者： Lan, MingJing An, LiuYang Natl Digital Switching Syst Engn & Technol Res Ct Zhengzhou Peoples R China

ISBN: (纸本)9780769548524;9781467330930

To solve the problem of service failure for job management services, a new failure recovery Framework named J-FRF is given. During the life cycle of service and job, states are monitored and contexts are saved. When service failure occurs, the framework takes advantage of the persistent contexts to realize rapid recovery of service and job. The experiments show that J-FRF has a high recovery success rate and lower recovery time, and can be able to better handle the failure of job management services.

关键词： Service Grid computing Failure recovery Context Persistence

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Interference-Aware Multipath Routing Protocol for Video Transmission over ZigBee Wireless Sensor Networks

Interference-Aware Multipath Routing Protocol for Video Tran...

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International conference on multimedia computing and Systems (ICMCS)

作者： Bidai, Zahia Maimour, Moufida Oran Univ Lab Res Ind Comp & Networking LRIIR El Mnaouar Algeria Lorraine Univ CRAN UMR 7039 F-54506 Vandoeuvre Les Nancy France CNRS CRAN UMR 7039 F-75700 Paris France

ISBN: (纸本)9781479938247

The IEEE 802.15.4/ZigBee technology is emerging as an important wireless sensor networking solution for short and medium range communication due to its numerous advantages. On the other hand, multimedia applications have gained increasing popularity that gives us the opportunity to improve this technology to support video transmission. In limited bandwidth ZigBee networks (250 kbps at 2.4 GHz), how to increase the throughput in constrained environments has become the main challenge. Multi-path becomes a crucial feature in supporting video transmission. Using simultaneous multiple paths provides the bandwidth requirements of multimedia applications. Unfortunately, concurrent transmission creates the problem of inter-path interference mainly due to the broadcast nature of the underlying medium. In this paper, we propose an interference-minimized multipath routing to facilitate MPEG-4 video transmission over ZigBee-based WSNs. This latter is evaluated using comparison with an interfering multipath routing version and the single path routing under different video frame rates. Results show that the proposed interference-aware multipath routing for Zig Bee-based WSNs can dramatically reduce the level of interference and thus maximize the overall throughput and improve the received video quality.

关键词： IEEE 802.15.4/ZigBee MPEG-4 video Multipath routing Interference Performance evaluation

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Content-Based Retrieval in Peer-to-Peer Networks Using Cooperative Caching

Content-Based Retrieval in Peer-to-Peer Networks Using Coope...

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7th International conference on Collaborative computing: networking, Applications and Worksharing (CollaborateCom)

作者： Yang, Bo Mareboyana, Manohar Bowie State Univ Dept Comp Sci Bowie MD 20715 USA

ISBN: (纸本)9781936968367

Devising a uniform paradigm for the representation of multimedia data contents in distributed systems in the presence of heterogeneity, distribution, and semantic gap is a difficult task. When adding technological limitations to this mix, the problem becomes more complex. In this paper, we present a logic-based model for representing the semantics of complex multimedia data objects. The model employs first-order logic to describe the semantic contents of multimedia data, such as visual objects and color/texture features. The aim of this model is to provide general multimedia content representation that can be used in object-oriented information systems. The novelty of this framework comes from (1) its mathematical capability to represent semantic contents, (2) the hierarchical organization and classification of multimedia data objects according to their semantic contents, and (3) the ease of nearest-neighbor searching through synonym links. Finally, the simulation results are presented and analyzed based on various performance metrics.

关键词： collaborative computing multimedia retrieval logic-based representation

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Early evaluation of future consumer AV content analysis applications with PC networks

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multimedia TOOLS AND APPLICATIONS 2007年第2期34卷 201-220页

作者： de Lange, Fons Nesvadba, Jan Philips Res Labs Eindhoven Netherlands

The paper deals with software productivity improvement for consumer multimedia devices by means of PC and component technology and shows how this is done for complex real-time content analysis applications used in advanced new storage products of the future. Content analysis is a relatively new and immature technology. It is used for browsing and searching particular content items among thousands of others on "big" embedded storage devices like hard disks. As the storage capacity of hard disk and flash continues to grow rapidly, content analysis is bound to become a key enabling technology in future storage products. A major problem with content analysis features (and many other features as well) is that underlying algorithms are unstable, sometimes unavailable, or at least, very much in their infancy, and as such, subject to frequent changes. The paper describes an approach to facilitate early evaluation and integration of such immature features. This is done by packing each feature, as-is, into components and by providing PC network technology to interconnect them. In our prototyping framework, each component is an independent executable program that runs on some PC in the network, streaming AV data via TCP/IP and being controlled through UPnP networking. Experiences with large-scale prototyping activities we have carried out for the assessment of future content analysis systems, show that a PC based prototyping approach enables the integration of many different media processing features in a short time and that it allows for accurate analysis of the resource (CPU/memory) requirements of such components.

关键词： multimedia content analysis PC networking prototyping UPnP service oriented architecture

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An MPEG-7 multimedia data cartridge

An MPEG-7 multimedia data cartridge

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conference on multimedia computing and networking 2003

作者： Döller, M Kosch, H Univ Klagenfurt Inst Informat Technol A-9020 Klagenfurt Austria

ISBN: (纸本)0819448192

Broadly used Database Management Systems (DBMS) are not able to tackle the requirements of multimedia in querying, indexing and content modeling. Therefore, extenders for multimedia data types have been proposed. These extensions, however, offer only limited semantic modeling and rely on basic index structures which do not meet the whole nature of multimedia, for instance for a Nearest-Neighbor Search. In this context, the paper presents a methodology,for enhancing extensible ORDBMS for multimedia data. In particular, we introduce an MPEG-7 multimedia Data Cartridge which includes a semantically rich metadata model for multimedia content relying on the MPEG-7 standard. Furthermore, to fulfill the needs for efficient multimedia query processing, we created in this Cartridge a new indexing and query framework for various types of retrieval operations.

关键词： multimedia databases MPEG-7 multimedia index structures

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Object-causally ordered group protocol for distributed multimedia systems 15

Object-causally ordered group protocol for distributed multi...

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15th International conference on Information networking (ICON-15)

作者： Shimamura, K Tanaka, K Takizawa, M Tokyo Denki Univ Dept Syst & Comp Engn Tokyo Japan

ISBN: (纸本)0769509517;0769509525

In distributed applications like teleconferences, a group of multiple processes are cooperating, where messages exchanged among the processes are required to be causally delivered. The processes are exchanging kinds of multimedia objects in addition to traditional test data. The multimedia objects are longer than traditional messages and are structured. In this paper, we discuss new types of causally precedent relations among multimedia objects transmitted in the network. We discuss a protocol to causally deliver multimedia objects in a group of processes. We also show the evaluation of the protocol.

关键词： Application software Artificial intelligence Delay effects Distributed computing Electronic mail multimedia systems Protocols Systems engineering and theory Teleconferencing

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Secure service centered networking for nomadic usage - Position paper

Secure service centered networking for nomadic usage - Posit...

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5th Joint Working conference on Communications and multimedia Security (CMS 01)

作者： Hollick, M German Natl Res Ctr Informat Technol GMD IPSI Dept Mobile Interact Media D-64293 Darmstadt Germany

ISBN: (纸本)0792373650

Visions and expected predictions of future networking paradigms often include heterogeneous networks build upon an IP-based core. Future services form a key component within these networks and are expected to include support for nomadic and ubiquitous usage. This paper comprises a discussion of nomadic usage scenarios within service centered networks. Thereafter secure service discovery under nomadic conditions is explained by means of a model introduced in this contribution. This model embraces the nature of nomadic computing as macro-nomadic vs. micro-nomadic depending on the use case. As a conclusion unresolved problems concerning service security within the given boundaries will be presented.

关键词： service centered networking security nomadic and ubiquitous computing

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