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IEEE International Symposium on Broadband multimedia systems and Broadcasting (BMSB)

作者： Michael Luby Qualcomm Berkeley Research Office QUALCOMM Incorporated Berkeley CA USA

Although wide area wireless network capacity is growing significantly, the consumer demand for popular multimedia content delivered to mobile devices over these networks is growing even faster. An attractive alternative is to deliver multimedia content via broadcast, thereby economizing on the usage of network capacity. We describe best practice techniques for using forward error correction and interleaving the data to be broadcast for multimedia content, and receiver methodology for forward error correction decoding and de-interleaving received data for multimedia playback.

关键词： multimedia communication mobile handsets Streaming media Digital multimedia broadcasting Flash memory Random access memory Decoding

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ArabicTutor: A multimedia m-Learning platform for learning Arabic spelling and vocabulary

ArabicTutor: A multimedia m-Learning platform for learning A...

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IEEE International Conference on multimedia Computing and systems (ICMCS)

作者： Abdelkarim Erradi Sajeda Nahia Hind Almerekhi Lubna Al-kailani Department of Computer Science and Engineering Qatar University Doha Qatar

ISBN: (纸本)9781467315180

Internet-enabled mobile devices are increasingly used for enhancing the learning experience particularly for language learning. They can be exploited to allow learners to access and interact with multimedia learning resources from anywhere and at any time while offering an enhanced user experience. There are many systems for English learning such as ***. However there aren't many such mobile learning tools for Arabic. In this context, this paper addresses the need to leverage mobile-supported learning to ease learning Arabic. We report the experience of designing and developing a multimedia m-Learning platform (named ArabicTutor) for interactive learning of Arabic spelling and vocabulary. It uses interactive game-like delivery methods to acquire new linguistic skills in playful manner using the capabilities of modern mobile devices with multitouch technologies. The proposed platform provides an environment of authoring Arabic learning content and delivering it to the end-users in interactive, intuitive and enjoyable way. The learning content is organized into packages that contain a list of word, the different meanings of words with example sentences and multimedia illustrations. The package also contains other related linguistic and morphological information such as parts of speech of example sentences and their diacritization.

关键词： Speech multimedia communication Vocabulary Natural language processing Dictionaries mobile handsets Games

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Design and Optimization of mobile Aggregation Networks

Design and Optimization of Mobile Aggregation Networks

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作者： Papapanagiotou, Ioannis North Carolina State University

学位级别：Ph.D.

As more and more users access the Web through mobile devices, their traffic patterns need to be better understood. This is important both to wireless network carriers and to network administrators, as they provision their networks for the expected growth of smartphones and tablets. This thesis exposes some of the differences in terms of the networking behavior of smartphones, with a control group, namely laptops. In order to achieve this goal we introduce a device identification technique that is based on data mining. We show that the proposed technique can identify more than 97% of the devices. We perform a thorough study of the networking traffic generated by these devices. We focus on traffic protocols in which smartphones and laptops have distinct differences. Hence, we first look into the DHCP traffic behavior, and the implications of each operating system (e.g. iOS, Android, Windows, Mac OS X, Linux) to the network address space utilization. We propose a new DHCP leasing strategy which improves the network address utilization. Secondly, we examine Web traffic, and identify the differences in the multimedia content delivery, and the implications to caching. For instance, we see that smartphone browser caches are not very effective, and propose polices that may provide maximum savings with only a 10MB browser cache. Similarly, we evaluate proxy caches, and show how important is to handle partial downloads. We extend our caching work in techniques that can identify redundant bytes, in a finer granularity, for example the byte level. We show the extra savings that can be attained from the implementation of a byte cache in a wireless network and indicate the limitations that these systems introduce. We propose a hybrid system, that not only resolves these limitations, but may also provide extra savings. We evaluate these techniques with actual traces collected from an educational institution and from a corporate environment. Finally, we propose further optimization

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Design and Optimization of mobile Aggregation Networks.

Design and Optimization of Mobile Aggregation Networks.

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作者： Papapanagiotou,Ioannis. The University of North Carolina

学位级别：Doctor

As more and more users access the Web through mobile devices,their traffic patterns need to be better understood. This is important both to wireless network carriers and to network administrators,as they provision their networks for the expected growth of smartphones and tablets. This thesis exposes some of the differences in terms of the networking behavior of smartphones,with a control group,namely laptops. In order to achieve this goal we introduce a device identification technique that is based on data mining. We show that the proposed technique can identify more than 97% of the devices. We perform a thorough study of the networking traffic generated by these devices. We focus on traffic protocols in which smartphones and laptops have distinct differences. Hence,we first look into the DHCP traffic behavior,and the implications of each operating system e.g. iOS,Android,Windows,Mac OS X,Linux) to the network address space utilization. We propose a new DHCP leasing strategy which improves the network address utilization. Secondly,we examine Web traffic,and identify the differences in the multimedia content delivery,and the implications to caching. For instance,we see that smartphone browser caches are not very effective,and propose polices that may provide maximum savings with only a 10MB browser cache. Similarly,we evaluate proxy caches,and show how important is to handle partial downloads. We extend our caching work in techniques that can identify redundant bytes,in a finer granularity,for example the byte level. We show the extra savings that can be attained from the implementation of a byte cache in a wireless network and indicate the limitations that these systems introduce. We propose a hybrid system,that not only resolves these limitations,but may also provide extra savings. We evaluate these techniques with actual traces collected from an educational institution and from a corporate environment. Finally,we propose further optimizations from the architectura

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网路多媒体服务之使用者经验品质量测与提供

网路多媒体服务之使用者经验品质量测与提供

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作者：吴辰杞国立台湾大学

学位级别：博士

随着宽频网路的快速发展与高度普及，网路多媒体服务（例如网路电话和线上游戏）已经成为许多使用者在日程生活的一部分。另外，科技的进步使得各式运算装置的效能大幅提升，越来越多的使用者透过平板电脑和智慧型手机连结网际网路，已... 详细信息

随着宽频网路的快速发展与高度普及，网路多媒体服务（例如网路电话和线上游戏）已经成为许多使用者在日程生活的一部分。另外，科技的进步使得各式运算装置的效能大幅提升，越来越多的使用者透过平板电脑和智慧型手机连结网际网路，已经不只局限于桌上型电脑或笔记型电脑。由于运算装置效能和网路环境的异质性，让使用者在任何运算装置和网路环境上都能获得良好的服务品质，成为网路多媒体服务提供者的重要目标。然而，服务提供者必须先了解如何的服务品质才能够满足使用者的需求。我们在这篇论文探讨如何量测网路多媒体服务带给使用者的经验品质，以及探讨系统层面的效能因素如何影响网路多媒体服务的品质。首先我们提出基于群众外包概念的实验架构，能够有效且可靠地评估使用者对于多媒体服务品质的经验品质与满意程度。接着我们尝试了解网路电话系统如何透过调整收话端的拨放延迟机制，提供使用者良好的经验品质。另外，由于现今的网际网路无法保证资料传输品质，我们提出一个能够侦测点对点档案分享流量的机制，可用在网路管理上以提升网路服务效能。我们的主要贡献可分为三点：（一）运用我们提出的群众外包式多媒体服务的经验品质量测架构，可以有效率和经济地从广大受试者群体收集实验资料，并且能够保证实验结果的可靠度。（二）我们探讨三个热门的网路电话系统的拨放延迟机制，并指出这些系统可借由改善它们的机制而提供使用者更好的服务品质。（三）我们提出的点对点档案分享流量侦测机制能够达到很高的侦测率，能够对于网路服务品质提供带来很大的助益。

关键词：群众外包播放缓冲多媒体服务配对比较同侪式运算经验品质服务品质网路流量辨识网路电话

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What a juke! A collaborative music sharing system

What a juke! A collaborative music sharing system

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IEEE International Symposium on World of Wireless mobile and multimedia Networks (WoWMoM)

作者： Zhaofei Chen Emre A. Yavuz Gunnar Karlsson Laboratory for Communication Networks Linnaeus Center ACCESS KTH Stockholm Sweden

The fast spreading of smart mobile devices has changed the way people create and share multimedia contents. A recently proposed idea is to distribute contents opportunistically when devices are within each other's communication range. In this work we have seized this idea and designed and implemented a real-time music-sharing application that allows people to share a sound system for collective listening. The system utilizes a content-centric opportunistic networking middleware. The application provides an interface for users to play audio files stored in their own mobile devices through a shared jukebox that is within direct communication range. The jukebox plays the audio file that is first in queue in its playlist by streaming it from the publishing user device. All devices synchronize with the jukebox so that the users can observe the contents of the playlist on their displays in real-time. This paper presents the idea and motivation for such a system as well as its design and evaluation.

关键词： mobile handsets Middleware Feeds Real time systems Synchronization Media Peer to peer computing

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Energy-Efficient Multicasting of Multiview 3D videos to mobile devices

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ACM TRANSACTIONS ON multimedia COMPUTING COMMUNICATIONS AND APPLICATIONS 2012年第3期8卷 45-45页

作者： Hamza, Ahmed Hefeeda, Mohamed Simon Fraser Univ 102nd Ave Survey BC V3T 0A3 Canada

Multicasting multiple video streams over wireless broadband access networks enables the delivery of multimedia content to large-scale user communities in a cost-efficient manner. Three dimensional (3D) videos are the next natural step in the evolution of digital media technologies. In order to provide 3D perception, 3D video streams contain one or more views that greatly increase their bandwidth requirements. Due to the limited channel capacity and variable bit rate of the videos, multicasting multiple 3D videos over wireless broadband networks is a challenging problem. In this article, we consider a 4G wireless access network in which a number of 3D videos represented in two-view plus depth format and encoded using scalable video coders are multicast. We formulate the optimal 3D video multicasting problem to maximize the quality of rendered virtual views on the receivers' displays. We show that this problem is NP-complete and present a polynomial time approximation algorithm to solve it. We then extend the proposed algorithm to efficiently schedule the transmission of the chosen substreams from each video in order to maximize the power saving on the mobile receivers. Our simulation-based experimental results show that our algorithm provides solutions that are within 0.3 dB of the optimal solutions while satisfying real-time requirements of multicast systems. In addition, our algorithm results in an average power consumption reduction of 86%.

关键词： Design multimedia networking energy saving wireless networks 3D video WiMAX LTE

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Influence of Playability and Usability in a mobile Human Computation Game

Influence of Playability and Usability in a Mobile Human Com...

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International Conference on Distributed Computing systems Workshop

作者： Somasundaram Kothandapani Dion Hoe-Lian Goh Khasfariyati Razikin Wee Kim Wee School of Communication and Information Nanyang Technological University Singapore

Human Computation Games (HCGs) are applications that harness human intelligence to generate content using the element of fun. Originating in the Web environment, HCGs have now appeared on mobile devices with the advent of global positioning systems, wireless Internet access and multimedia capabilities. In this research, we study usability and playability factors that influence a mobile HCG, known as Glob, by comparing it with the non-game based mobile content sharing application known as Geo Topic. The applications were evaluated based on satisfaction, ease of use and usefulness aspects of usability, as well as the leisure, social interaction and challenge aspects of playability. Results suggested that Glob scored significantly better in terms of playability for leisure and social interaction. Further, Geo Topic scored significantly better in terms of the ease of use aspect of usability.

关键词： Games Usability mobile communication Positron emission tomography Humans mobile handsets Regression analysis

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Frontiers of wireless and mobile communications

Frontiers of wireless and mobile communications

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作者： Raychaudhuri, Dipankar Mandayam, Narayan B. WINLAB Rutgers University Technology Centre of NJ North Brunswick NJ 08902 United States

The field of wireless and mobile communication has a remarkable history that spans over a century of technology innovations from Marconi's first transatlantic transmission in 1899 to the worldwide adoption of cellular mobile services by over four billion people today. Wireless has become one of the most pervasive core technology enablers for a diverse variety of computing and communications applications ranging from third-generation/fourth-generation (3G/4G) cellular devices, broadband access, indoor WiFi networks, vehicle-to-vehicle (V2V) systems to embedded sensor and radio-frequency identification (RFID) applications. This has led to an accelerating pace of research and development in the wireless area with the promise of significant new breakthroughs over the next decade and beyond. This paper provides a perspective of some of the research frontiers of wireless and mobile communications, identifying early stage key technologies of strategic importance and the new applications that they will enable. Specific new radio technologies discussed include dynamic spectrum access (DSA), white space, cognitive software-defined radio (SDR), antenna beam steering and multiple-input-multiple- output (MIMO), 60-GHz transmission, and cooperative communications. Taken together, these approaches have the potential for dramatically increasing radio link speeds from current megabit per second rates to gigabit per second, while also improving radio system capacity and spectrum efficiency significantly. The paper also introduces a number of emerging wireless/mobile networking concepts including multihoming, ad hoc and multihop mesh, delay-tolerant routing, and mobile content caching, providing a discussion of the protocol capabilities needed to support each of these usage scenarios. In conclusion, the paper briefly discusses the impact of these wireless technologies and networking techniques on the design of emerging audiovisual and multimedia applications as they migrate to mobile

关键词： Cognitive radio

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LMS INTTIC system using mobile technology and podcasting in blended learning

LMS INTTIC system using mobile technology and podcasting in ...

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International Conference on Education and e-Learning Innovations (ICEELI)

作者： Belkacem Kouninef Redouane Tlemsani Sidi Mohamed Rerbal Abdelhadi Lotfi Institut National des Télécommunications et des Technologies de lInformation et de la Communication Laboratoire LaRATIC Oran Algeria

Social technology intersection indicates how a mobile device could facilitate communication and collaboration with many individuals and systems - the options available for social interaction using the technical capabilities of the mobile device to send SMS, call a friend, access the internet, etc. mobile device is the beginning of something new in blended learning. Technology progress in the field of learning has evolved especially with the use of e-learning and now with the emergence of a new concept called m-learning due to mobile technologies, which are probably the most influential technology for teaching and learning in the next decade. Internet access remains inaccessible to most of our students. But almost all students have access to mobile technology. Nevertheless, the m-learning has some constraints in the use of mobile technologies such as the size of the screen which is too small for reading, battery life that is in constant progress but still low for e-learning applications, user interfaces that are not user-friendly on most mobile phones and diversity of mobile devices and the rapidly changing trends suggest producing “LMS mobiles” adaptable to a wide range of mobiles. To avoid redundancy in the reproduction of content that exists in the e-learning environment, we combined in this approach the use of mobile device in the blended learning to offer to our students the opportunity to be mobile and use the mobile as the medium of information. In this paper the benefits of mobile-learning and its use in the INTTIC's Moodle platform are presented. A new way to send information to different learners is developed, relying on the multimedia podcasting technology. This latter is still relatively new and not widely known.

关键词： mobile communication mobile handsets Electronic learning Digital audio broadcasting Internet Personal digital assistants

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