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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems"

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A graph indexing approach for content-based recommendation system

A graph indexing approach for content-based recommendation s...

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2010 2nd International conference on multimedia and Information Technology, MMIT 2010

作者： Peng, Tao Wang, Wendong Gong, XiangYang Tian, Ye Yang, XiaoGang Ma, Jian State Key Laboratory of Networking and Switching Beijing University of Posts and Telecommunications Beijing China Nokia Beijing Research Center Beijing China

ISBN: (纸本)9780769540085

Conventional content-based recommendation systems use different classifying algorithms to group items into several groups and for each group generate a ranking list of items. An important characteristic of conventional content-based recommendation systems is that they use the same ranking list to make recommendations for items in each group, ignoring differences among items inside of a group. The paper proposes a content-based recommendation system built on top of a weighted un-directional graph. The graph describes the content similarity between items based on the semantic relations of their metadata. Neighbors of a node in the graph construct a ranking list of items to be recommended and there is a ranking list for each item. So it is able to emphasize differences among related items. We developed a prototype of the proposed system in Kaleido Photo project, and it proves to be sufficient to recommend most similar photos according to what the user is viewing. © 2010 IEEE.

关键词： Recommender systems

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User driven audio content navigation for spoken web

User driven audio content navigation for spoken web

引用

18th ACM International conference on multimedia ACM multimedia 2010, MM'10

作者： Dhanesha, Ketki A. Rajput, Nitendra Srivastava, Kundan IBM Research EGL-3D-450 Domlur Inner Ring Road Bangalore India IBM Research ISID Campus 4 Block C Vasant Kunj New Delhi India

ISBN: (纸本)9781605589336

It is a common practice for us to skim textual content on a web page. While skimming, we usually skip words or phrases that are not of interest to us and we slow down our speed when the content seems to be of relevance to us. But when we listen to audio content, which is not persistent and is sequential, such skimming is not possible. In developing countries, cell-phone penetration is much higher than Internet penetration. Moreover, due to low literacy, voice is a convenient modality to access information. The skimming techniques are therefore more critical in the audio domain. In this paper, we describe the technique for navigating audio content while interacting with information systems in a client server environment, where a dumb phone is the client device. The paper presents techniques for skimming audio content and for placing markers in audio. The user studies conducted with 18 users for more than 1 month, in a live setting substantiates the usability and usefulness of the navigation techniques. © 2010 ACM.

关键词： Navigation

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access Point Selection and Reducing the Handoff Latency to Support VoIP Traffic

Access Point Selection and Reducing the Handoff Latency to S...

引用

6th International conference on Computer Engineering and systems (ICCES)

作者： Tuysuz, Mehmet Fatih Mantar, Haci Ali Gebze Inst Technol Dept Comp Engn Kocaeli Turkey

ISBN: (纸本)9781424470426

In IEEE 802.11 WLANs, a station can associate with more than one access point (AP). Previous algorithms which consider only the received signal strength indicator (RSSI) can cause stations to be associated to a single or only a few number of AP. However, it results in an overall network performance degradation. Besides, Hondoff in wireless networks is one of the critical latency. Therefore, a new algorithm is required both to select the most proper access point (AP) and to reduce the handoff latency to support multimedia traffic. In this paper, we propose a new AP selection algorithm which is based on reducing the handoff latency, improving the perceived voice quality (R value), capacity utilization, transmission rate, fairness, hidden nodes and the number of associated stations to an AP. Proposed algorithm works efficiently in the existence of both real-time and non-real-time traffic. Simulation results show improvements on the overall throughput and the perceived voice quality for users.

关键词： component voice over ip (VoIP) handoff load balancing access point selection QoS

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An Attack on Wavelet Tree Shuffling Encryption Schemes

An Attack on Wavelet Tree Shuffling Encryption Schemes

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1st International conference on Security-Enriched Urban Computing and Smart Grid

作者： Assegie, Samuel Salama, Paul King, Brian Indiana Univ Purdue Univ Purdue Sch Engn & Tech Indianapolis IN 46202 USA

ISBN: (纸本)9783642164439

With the ubiquity of the internet and advances in technology, especially digital consumer electronics, demand for online multimedia services is ever increasing. While it's possible to achieve a great reduction in bandwidth utilization of multimedia data such as image and video through compression, security still remains a great concern. Traditional cryptographic algorithms/systems for data security are often not fast enough to process the vast amounts of data generated by the rnultimedia applications to meet the realtime constraints. Selective encryption is a new scheme for multimedia content protection. It Involves encrypting only a portion of the data to reduce computational complexity(the amount of data to encrypt)while preserving a sufficient level of security. To achieve this, many selective encryption schemes are presented in different literatures. One of them is Wavelet Tree Shuffling. In this paper we assess the security of a wavelet tree shuffling encryption scheme.

关键词： multimedia services

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Learning to rank for content-based image retrieval

Learning to rank for content-based image retrieval

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2010 ACM SIGMM International conference on multimedia Information Retrieval, MIR 2010

作者： Faria, Fabio F. Veloso, Adriano Almeida, Humberto M. Valle, Eduardo Torres, Ricardo Da S. Gonçalves, Marcos A. Meira Jr., Wagner Institute of Computing University of Campinas Campinas-SP Brazil Dep. of Computer Science Fed. Univ. Minas Gerais Belo Horizonte MG Brazil

ISBN: (纸本)9781605588155

In content-based Image Retrieval (CBIR), accurately ranking the returned images is of paramount importance, since users consider mostly the topmost results. The typical ranking strategy used by many CBIR systems is to employ image content descriptors, so that returned images that are most similar to the query image are placed higher in the rank. While this strategy is well accepted and widely used, improved results may be obtained by combining multiple image descriptors. In this paper we explore this idea, and introduce algorithms that learn to combine information coming from different descriptors. The proposed learning to rank algorithms are based on three diverse learning techniques: Support Vector Machines (CBIR-SVM), Genetic Programming (CBIR-GP), and Association Rules (CBIR-AR). Eighteen image content descriptors(color, texture, and shape information) are used as input and provided as training to the learning algorithms. We performed a systematic evaluation involving two complex and heterogeneous image databases (Corel e Caltech) and two evaluation measures (Precision and MAP). The empirical results show that all learning algorithms provide significant gains when compared to the typical ranking strategy in which descriptors are used in isolation. We concluded that, in general, CBIR-AR and CBIR-GP outperforms CBIR-SVM. A fine-grained analysis revealed the lack of correlation between the results provided by CBIR-AR and the results provided by the other two algorithms, which indicates the opportunity of an advantageous hybrid approach. Copyright 2010 ACM.

关键词： Genetic programming

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Adaptive algorithms for efficient content management in social network services

Adaptive algorithms for efficient content management in soci...

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10th IEEE International conference on Computer and Information Technology, CIT-2010, 7th IEEE International conference on Embedded Software and systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and Communications, ScalCom-2010

作者： Canali, Claudia Colajanni, Michele Lancellotti, Riccardo University of Modena and Reggio Emilia Italy

ISBN: (纸本)9780769541082

Identifying the set of resources that are expected to receive the majority of requests in the near future, namely hot set, is at the basis of most content management strate- gies of any Web-based service. Here we consider social network services that open interesting novel challenges for the hot set identification. Indeed, social connections among the users and variable user access patterns with continuous operations of resource upload/download determine a highly variable and dynamic context for the stored resources. We propose adaptive algorithms that combine predictive and social information, and dynamically adjust their parameters according to continuously changing workload characteristics. A large set of experimental results show that adaptive algorithms can achieve performance close to theoretical ideal algorithms and, even more important, they guarantee stable results for a wide range of workload scenarios. © 2010 IEEE.

关键词： Adaptive algorithms

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Unified content design for ubiquitous learning: The soldering seminar use case

Unified content design for ubiquitous learning: The solderin...

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4th IEEE International conference on E-Learning in Industrial Electronics, ICELIE 2010

作者： Rodriguez-Alsina, Aitor Cespedes-Borras, Eduard Puig-Fargas, Roger Moreno-Berengue, Marc Carrabina, Jordi Universitat Autonoma de Barcelona ETSE E-08193Bellaterra Spain

ISBN: (纸本)9781424472529

The presence of new technologies on distance education generates a cloud of learning environments with high presence of multimedia contents and mobility capabilities. The widespread use of mobile technologies, digital TV and Internet enables ubiquitous learning environments that allow students to learn anywhere anytime. However, the diversity of computational and display capabilities of the current access devices (i.e. PC, mobile phones, set-top boxes) requires a smart content design methodology to reduce the development time. This paper aims to present the methodology followed to generate platform-independent interactive learning materials with high presence of multimedia resources and its deployment in different platforms. The methodology is shown taking the example of an interactive application to drive a seminar on the soldering process of complex BGA chip packages for building electronic systems. This content design process is shown from our platform-independent design level until its deployment in PC, TV and mobile platforms. This may help teachers and content creators in the generation of learning materials that are independent of the Learning content Management System (LCMS) that serve it and the device used to access to it. Moreover, basic guidelines are given to generate the classroom materials through the same unified design process. ©2010 IEEE.

关键词： Design

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Core Tree Optimization in Hybrid Peer to Peer Real Time Broadcasting System

Core Tree Optimization in Hybrid Peer to Peer Real Time Broa...

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IEEE Global Telecommunications conference (GLOBECOM 2010)

作者： Lee, Sanghwan Sahu, Sambit Kookmin Univ Sch Comp Sci Seoul South Korea IBM Corp TJ Watson Res Ctr Yorktown Hts NY 10598 USA

ISBN: (纸本)9781424456383

Peer to peer based live multimedia streaming systems over the Internet have been gaining popularity these days because they can be easily deployed without router based IP multicast capabilities. However, the peers frequently join and leave the system so that some peers may experience service disruptions, which degrade the overall quality and reputation of the services. In this situation, a hybrid approach is considered as a viable alternative. In the hybrid approach, the service providers deploy multiple proxies all over the Internet and make them constitute a core tree in the peer to peer system so that the proxies behave as stable nodes that are always on. Thus the system quality can increase. In this paper, we propose a centralized core tree construction scheme based on various optimization algorithms. The scheme focuses on constructing a core tree that maximizes the overall quality of the system. Because the real time multimedia streaming systems have higher QoS requirements than the content distribution such as Akamai, we take into account not only the locations of the proxies but also the topology formed by the proxies. The general framework can obtain a tree for arbitrary performance metrics not only for a specific metric such as minimum delay. Through simulations over diverse scenarios, we show that our optimization based approaches can provide a better core tree than some greedy heuristic approaches.

关键词： Internet Internet QoS broadcasting centralized core tree construction scheme core tree optimization hybrid peer to peer real time broadcasting system live multimedia streaming media streaming multiple proxy optimisation peer-to-peer computing service prov

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The design and development of exceptional representation based on domain ontology and multi-agent systems for e-learning purposes

The design and development of exceptional representation bas...

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Asia Modelling Symposium 2010: 4th International conference on Mathematical Modelling and Computer Simulation, AMS2010

作者： Hosam, Al-Samarraie Abbas, Merza Naufal, Irfan Center for IT and Multimedia Universiti Sains Malaysia Penang Malaysia

ISBN: (纸本)9780769540627

E-learning involves the use of digital content in the form of text and multimedia elements that are accessed via hyperlinks and also via browser or search engines. The search engines currently available to the learners are as offered by Acrobat Reader or Google which employ basic search-by-word-matching algorithms and present outputs in linear fashion based on occurrence in the text or arranged hierarchically by popularity or frequency of being accessed. This research aims to improve the meaningfulness of the search results which other systems focused on specifying the context of the search as offered by Yahoo, and the development of the semantic web as in wiki. These methods improve the search results but need further refinements to be truly effective in the elearning environment. Thus, this study proposes the use of the exceptional representation of learning strategies based on domain ontology and multi-agent systems (MAS). © 2010 IEEE.

关键词： Multi agent systems

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VIDEO CROSS-TALK REDUCTION AND SYNCHRONIZATION FOR TWO-WAY COLLABORATION

VIDEO CROSS-TALK REDUCTION AND SYNCHRONIZATION FOR TWO-WAY C...

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IEEE International conference on Image Processing

作者： Samadani, Ramin Apostolopoulos, John G. Robinson, Ian Tan, Kar-Han Multimedia Communications Networking Lab United States

ISBN: (纸本)9781424479948

Recent two-way collaboration prototypes attempt to improve natural interactivity, correct eye contact and gaze direction, and media sharing using novel configurations of projectors, screens, and video cameras. These systems are often afflicted by video cross-talk where the content displayed for viewing by the local participant is unintentionally captured by the camera and delivered to the remote participant. Prior attempts to reduce this cross-talk purely in hardware through various forms of multiplexing (e.g., temporal, wavelength (color), polarization) have performance and cost limitations. In this work, careful system characterization and subsequent signal processing algorithms allow us to reduce video cross-talk. The signals themselves are used to detect temporal synchronization offsets which then allow subsequent reduction of the cross-talk signal. Our software-based approach enables the effective use of simpler hardware and optics than prior methods. Results show substantial cross-talk reduction in a system with unsynchronized projector and camera.

关键词： video cross-talk visual echo cancellation immersive collaboration synchronization projector-camera systems

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