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Journal of Mobile Multimedia

Editor-in-Chief: Pavlos Lazaridis, University of Huddersfield, UK

Melbourne Institute of Technology, Australia

ISSN: 1550-4646 (Print Version),

ISSN: 1550-4654 (Online Version)
Vol: 2   Issue: 2

Published In:   June 2006

Publication Frequency: Quarterly

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Content Adaptation Based Approach for Ubiquitous Multimedia

Hai-Peng Wang1, Zhi-Wen Yu2, Xing-She Zhou3, Tao Zhang3, and Dong Xian3

1School of Computer Science, Northwestern Polytechnical University Xi’an, 710072 Shaanxi, P.R.China
2Information Technology Center, Nagoya University Nagoya, Japan
3Northwestern Polytechnical University Xi’an, 710072 Shaanxi, P.R.China

Abstract: [+]    |    Download File [ 177KB ]

Abstract: Content adaptation is playing an important role in ubiquitous multimedia, however it is a challenging work due to the high degree of dynamism and heterogeneity of the ubiquitous computing environments, where hundreds of devices provide information, and thousands of terminals access these information. Recently, some researchers proposed to address this issue by dynamically organizing services or components into customized applications at runtime. However, due to the maintenance of the dependencies between services or components, this kind of system becomes more complicated with the growth of the system scale. Programming for these systems is also error-prone. This paper discusses the issues of content adaptation based approach for ubiquitous multimedia, and presents a prototype system, called UbiCon system. By abstracting media streams into generic CONTENT entities, the system provides a simple and powerful means for services to operate media stream. The CONTENT is dynamically created by the system at runtime, and essentially has local association with related services. As a result, the CONTENT is also used as a loosely coupling method for cooperating associated services. By abstracting services with a T model, the services can effectively cooperate together with other services. As a result, a collection of sophisticated applications can be built with this simple and effective services model.

Keywords: ubiquitous multimedia, ubiquitous computing, content adaptation

Content Adaptation on mobile devices using MPEG

Anastasis A. Sofokleous and Marios C. Angelides

Brunel University, School of Information Systems, Computing and Mathematics Kingston Lane, Uxbridge, Middlesex UB8 3PH, United Kingdom

Abstract: [+]    |    Download File [ 417KB ]

Abstract: Content authors pursue the creation of mobile content that is ubiquitous in nature, i.e. published once only but being available anywhere, anytime, on any device. However, mobile content must accommodate varying resource constraints on different devices such as reduced resolution, processing power, memory and network bandwidth. In this chapter, we discuss those issues that are pertinent to multimedia content adaptation across different devices with reference to MPEG-21’s Digital Item Adaptation for mobile devices. In particular, we consider how the range of aspects that affect a mobile usage environment, i.e. network, natural environment, device and user characteristics, could be used alongside a set of userdefined limitation and optimization constraints, to adapt content and thereby maximize quality of service.

Keywords: MPEG-21, Content Adaptation, Adaptation Quality of Service, Mobile Devices

Bazaar: A Middleware for Physical World Abstraction

Kaori Fujinami and Tatsuo Nakajima

Department of Computer Science, Waseda University

Abstract: [+]    |    Download File [ 872KB ]

Abstract: In this paper, we propose a middleware, Bazaar, for building location and context-aware service without the need to consider the details of information capturing, but to allow a developer to concentrate on his/her main task, i.e. the application logic development. Bazaar abstracts the physical world by separating the structures of information and the usage from utilization. It also serves as a shared “physical information repository” to maintain consistency among various applications in the environment, which is often called the world model.

Keywords: Ubiquitous Computing, Context-Awareness, Sentient Artefact, World Model, Middleware

Listening Comprehension of English Second Language with Mobil Devices

Mahieddine Djoudi

SIC Laboratory & IRMA Research Group, University of Poitiers, France

Abstract: [+]    |    Download File [ 171KB ]

Abstract: The use of the mobile devices in language learning has been developed at very high speed these last years. Thus, we are witnessing many research and development projects, methodologies, and scientific publications. However, the interest in research related to listening comprehension competence remains relatively low. In this paper, we propose a simple and original approach, which aims to use mobile devices for listening comprehension of foreign language especially English Second Language for French learners. This approach is based on an easy to use technology that makes it possible for learners to work, anywhere and at their own rhythm, the listening comprehension of a foreign language. With the mobile MP3 player, the learner can carry a worth of English lessons, practicing pronunciation and conversation drills with the audio tracks. He can download from web based mobile-learning environment (named Nomad’s Lang) the MP3 audio tracks and written lessons (created par teachers) and read them on any mobile device (PDA, Pocket PC or Laptops, etc.). The paper starts with the summary of mobile devices, language skills and listening comprehension. It then highlights our approach of the use of mobile devices for learning English second language. Finally a learner evaluation is performed. The paper ends with the discussion of results and conclusion

Keywords: Listening Comprehension, English Second Language, Mobile Learning, Mobile Devices, Portable MP3 Player, Podcasting

A Novel Approach for Improving the Quality of Service for Wireless Video Transcoding

Ashraf M.A. Ahmad1 and Suh-Yin Lee2

1Department of Computer Science and Information Engineering National Chiao-Tung University, 1001 Ta-Hsueh Rd, Hsinchu, Taiwan
2Department of Computer Science and Information Engineering National Chiao-Tung University, 1001 Ta-Hsueh Rd, Hsinchu, Taiwan

Abstract: [+]    |    Download File [ 327KB ]

Abstract: To deliver streaming video over wireless networks is an important component for most interactive multimedia applications running on personal wireless handset devices. Such personal devices should be inexpensive, compact, and lightweight. Wireless channels have limited bandwidth and a high channel bit error rate. Delay variation of packets due to network congestion with the high bit error rate lessens the quality of video at the handheld device. Therefore, mobile access to multimedia content requires video transcoding functionality at the edge of the mobile network for interworking with heterogeneous networks and services. Under certain conditions, the bandwidth of a coded video stream needs to be drastically reduced. We propose a cost-efficient mechanism for improving the quality of service (QoS) delivered to the mobile user, by introducing a robust and efficient transcoding scheme as proven by extensive experiments. The proposed approach refines the motion vectors value without the need to re-perform the motion estimation process. Then the transcoding mechanism will be preformed using the new fine motion vectors. Thus, great amounts of computing resources have been saved. Exceptional performance is demonstrated in the experiment results, as these experiments were designed to verify and prove the robustness of the proposed approach.

Keywords: Wireless and Mobile Computing, Video Transcoding, Quality of Service, Motion Estimation

River Publishers: Journal of Mobile Multimedia