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Impact of packet-level FEC and existing link level reliability mechanisms to deliver MBMS content over WCDMA mobile satellite systems

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING 2006年第2期24卷 169-184页

作者： Mudugamuwa, U Evans, BG Univ Surrey Mobile Commun Res Grp Ctr Commun Syst Res Guildford GU2 7XH Surrey England

The inherent broadcast capabilities of satellites make them an attractive solution for the delivery of multimedia services to mobile users in third generation (3G) networks. Reliable delivery of content over a hostile land-mobile satellite channel is one of the key technical system requirements that can be addressed at different protocol layers. In this paper, we focus our attention on some of the mechanisms which can provide partial reliability: the packet-level forward error correction (PLFEC) technique in radio access network (RAN), different interleaving depths at physical layer (inter frame) and power allocation in the satellite radio interface. We rely on an end-to-end simulation platform in order to assess the performance gain achieved by these mechanisms separately, and provide clear indications for the achievable benefits at system level when some of these mechanisms act in co-ordination rather than in isolation. Copyright (c) 2006 John Wiley & Sons, Ltd.

关键词： packet level FEC higher interleaving depth power allocation satellite UMTS

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P2PEACE: A P2P-based simulation environment for autonomic content exchange networks

P2PEACE: A P2P-based simulation environment for autonomic co...

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2006 International conference on Autonomic and Autonomous systems, ICAS'06

作者： Benayoune, Fares Lancieri, Luigi Ag Rhissa, Anasser France Telecom R and D France Institut National des Télécoms France

ISBN: (纸本)0769526535

This paper presents a study on a global replication architecture intended to autonomic content exchange between communities of active nodes. The main objective is to exploit and reuse the synergy of groups to optimize data access in a distributed system. A self management based on thematic similarity between nodes is an efficient manner of optimizing data access (availability and selectivity). The evaluation and the test of such architecture before its large deployment are, however, extremely important. Therefore, a simulation tool called P2PEACE is developed. It is designed primarily to visualize interactions between the network nodes and provide some related statistics to measure the exchange performance. In fact, the existing simulation environments offer good tools of testing the performance of an isolated node (e.g. web cache) or algorithms used for cooperation between groups. However, these approaches do not give a clear vision of the content mobility between the system nodes. In this paper, a method to analyze collective nodes as a global system and understand how contents move around them is, therefore, proposed. Results showed that a semantic organization can greatly optimize the exchanges in such a situation. © 2006 IEEE.

关键词： Distributed computer systems

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Key-text spotting in documentary videos using Adaboost

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conference on Image Processing - algorithms and systems, Neural Networks, and Machine Learning

作者： Lalonde, M. Gagnon, L. CRIM R&D Dept 550 Sherbrooke WSuite 100 Montreal PQ H3A 1B9 Canada

ISBN: (纸本)0819461040

This paper presents a method for spotting key-text in videos, based on a cascade of classifiers trained with Adaboost. The video is first reduced to a set of key-frames. Each key-frame is then analyzed for its text content. Text spotting is performed by scanning the image with a variable-size window (to account for scale) within which simple features (mean/variance of grayscale values and x/y derivatives) are extracted in various sub-areas. Training builds classifiers using the most discriminant spatial combinations of features for text detection. The text-spotting module outputs a decision map of the size of the input key-frame showing regions of interest that may contain text suitable for recognition by an OCR system. Performance is measured against a dataset of 147 key-frames extracted from 22 documentary films of the National Film Board (NFB) of Canada. A detection rate of 97% is obtained with relatively few false alarms.

关键词： text detection Adaboost video indexing multimedia systems

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Sequence mining on web access logs: A case study

Sequence mining on web access logs: A case study

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18th Belgium-Netherlands conference on Artificial Intelligence, BNAIC 2006

作者： Soares, Carlos de Graaf, Edgar Kok, Joost N. Kosters, Walter A. LIACC/Faculty of Economics University of Porto Rua de Ceuta 118 6 andar 4050-190 Porto Portugal LIACS University of Leiden Leiden Netherlands

We present a case study in which sequence mining algorithms were applied to web access log data. The data are from a portal that is targeted for business users. In this portal, like in many others, content is described using a set of descriptors, such as keywords, category and type. We investigate whether representing content by the type rather than its identifier enables existing sequence mining methods to obtain interesting patterns. Rather than a more traditional approach based on measures such as support and confidence, we analyze results from an application perspective. This enables us to identify opportunities for improving and extending these methods.

关键词： Data mining

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Innovative ICT tools for information provision in agricultural extension (December 2005)

Innovative ICT tools for information provision in agricultur...

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International conference on Information and Communication Technologies and Development

作者： Ramamritham, Krithi Bahuman, Anil Duttagupta, Subhasri Bahuman, Chaitra Balasundaram, Srividya Indian Inst Technol Dev Informat Lab Bombay 400076 Maharashtra India

ISBN: (纸本)9781424404841

aAQUA is an online multilingual, multimedia Agricultural portal for disseminating information from and to the grassroots of the Indian agricultural community. aAQUA simultaneously addresses two major challenges in farmer outreach programs - geographic reach and customized delivery. It answers farmers queries based on the location, season, crop and other information provided by farmers. aAQUA makes use of novel database systems and information retrieval techniques like intelligent caching, offline access with intermittent synchronization, semantic-based search, etc. Agricultural content repositories (Digital Library), Agri-price information (Bhav Puchiye), farmer schemes and various operations support databases (aAQUA-QoS) have also emerged from the experience of aAQUA deployments. aAQUA's large scale deployment provides avenues for researchers to contribute in the areas of knowledge management, cross- lingual information retrieval, and providing accessible content for rural populations. Apart from Agriculture, aAQUA can be configured and customized for Expert advice over mobile networks and the internet in Education, Healthcare and other domains of interest to a developing population. This paper will showcase the utility of various component databases built into aAQUA to enhance the QoS delivered to rural populations.

关键词： agriculture caching databases database synchronization farmer outreach human computer interaction internet and communication technologies for development digital library knowledge management low-bandwidth application multilingual information retrieval offline access price information

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A study on content based image retrieval using template matching of wavelet transform

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10th International conference on Knowledge-Based and Intelligent Information and Engineering systems

作者： Seo, Duck Won You, Kang Soo Kwak, Hoon Sung Chonbuk Natl Univ Dept Comp Engn Jeonju 561756 Jeonbuk South Korea Jeonju Univ Sch Liberal Arts Jeonju 560759 Jeonbuk South Korea

ISBN: (纸本)3540465359

Recently, issues on the internet searching of image information through various multimedia databases have drawn a tremendous attention and several researches on image information retrieval methods are on progress. By incorporating wavelet transform and correlation metrics, we propose a novel and highly efficient feature vector extraction algorithm that has a capability of a robust similarity matching. Through a number of simulations using thousands of images as a database, our presented method has been tested and verified. The simulation results have yielded a faster and highly accurate candidate image retrieval performance in comparison to those of the conventional algorithms. Such an improved performance can be obtained because the used feature vectors were compressed to 256:1 while the correlation metrics are incorporated to provide a finer information for the better matching.

关键词： image retrieval template matching wavelet transform

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The SINAMED and ISIS projects:: Applying text mining techniques to improve access to a medical digital library

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10th European conference on Research and Advanced Technology for Digital Libraries

作者： de Buenaga, Manuel Mana, Manuel Gachet, Diego Mata, Jacinto Univ Europea Madrid Escuela Super Politecn Madrid 28670 Spain Univ Huelva Dept Ingn Elect Sistemas Informat & Aut Escuela Poltiecn Super Palos De La Frontera 21819 Huelva Spain

ISBN: (纸本)3540446362

Intelligent information access systems integrate text mining and content analysis capabilities as a relevant element in an increasing way. In this paper we present our work focused on the integration of text categorization and summarization to improve information access on a specific medical domain, patient clinical records and related scientific documentation, in the framework of two different research projects: SINAMED and ISIS, developed by a consortium of two research groups from two universities, one hospital and one software development firm. SINAMED has a basic research orientation and its goal is to design new text categorization and summarization algorithms based on the utilization of lexical resources in the biomedical domain. ISIS is a R&D project with a more applied and technology-transfer orientation, focused on more direct practical aspects of the utilization in a concrete public health institution.

关键词： Digital libraries

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ICDEW 2006 - Proceedings of the 22nd International conference on Data Engineering Workshops

ICDEW 2006 - Proceedings of the 22nd International Conferenc...

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22nd International conference on Data Engineering Workshops, ICDEW 2006

ISBN: (纸本)0769525717

The proceedings contain 146 papers. The topics discussed include: using web knowledge to improve the wrapping of web sources;ontology-based information tailoring;the eNTERFACE'05 audio-visual emotion database;speeding up color-based retrieval in multimedia database management systems that store images as sequences of editing operations;experience of animate similarity concepts in multimedia database;clustering multidimensional trajectories based on shape and velocity;approximate video search based on spatio-temporal information of video objects;a node split algorithm reducing overlapped index spaces in M-Tree index scheme for music information retrieval system;strategic properties of peer-to-peer data structures and behaviour of human peers in economic experiments;trust negotiation as an authorization service for web services;scalable and efficient data streaming algorithms for detecting common content in internet traffic;estimating top n hosts in cardinality using small memory resources;a new approach for information processing in wireless sensor network database applications;and a multiple-perspective, interactive approach to web information extraction and exploration.

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Resource allocation framework for distributed real-time end-to-end tasks

Resource allocation framework for distributed real-time end-...

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12th International conference on Parallel and Distributed systems, ICPADS 2006

作者： Kuo, Chin-Fu Shih, Chi-Sheng Kuo, Tei-Wei Graduate Institute of Networking and Multimedia Department of Computer Science and Information Engineering National Taiwan University Taipei 106 Taiwan

ISBN: (纸本)0769526128

Traditional resource allocation algorithms such as Q-RAM [11] assume that importance (or weight) or utility values for distributed real-time tasks is a totally ordered set to measure the rewards for completing every task. Hence, resource allocation problem can be viewed as the problem of maximizing total utility values. However, in several real-time applications such as Multi-Function Phased Array Radar (MFPAR) systems, totally ordered importance are not available. We develop a two-level resource allocation framework. The framework allows the schedulers for subsystems or processors in distributed real-time systems to autonomously schedule local sub-tasks and the system performance is enhanced without heavy global optimization overhead. In addition, the framework can trade the run-time overhead including time and memory space with the optimality of resource allocation. We evaluate our framework by extensive simulations for MFPAR systems. The experimental results show that the developed framework outperforms the traditional priority-based approach. © 2006 IEEE.

关键词： Random access storage

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Impact of packet-level FEC and existing link level reliability mechanisms to deliver MBMS content over WCDMA mobile satellite systems

Impact of packet-level FEC and existing link level reliabili...

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Advanced Satellite Mobile System conference

作者： Mudugamuwa, U Evans, BG Univ Surrey Mobile Commun Res Grp Ctr Commun Syst Res Guildford GU2 7XH Surrey England

关键词： packet level FEC higher interleaving depth power allocation satellite UMTS

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