Legacy buffer cache management schemes for multimedia server are grounded at the assumption that the application sequentially accesses the multimedia file. However, user access pattern may not be sequential in some ci...
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ISBN:
(纸本)0819446408
Legacy buffer cache management schemes for multimedia server are grounded at the assumption that the application sequentially accesses the multimedia file. However, user access pattern may not be sequential in some circumstances, for example, in distance learning application, where the user may exploit the VCR-like function(rewind and play) of the system and accesses the particular segments of video repeatedly in the middle of sequential playback. Such a looping reference can cause a significant performance degradation of interval-based caching algorithms. And thus an appropriate buffer cache management scheme is required in order to deliver desirable performance even under the workload that exhibits looping reference behavior. We propose Adaptive Buffer cache Management(ABM) scheme which intelligently adapts to the file access characteristics. For each opened file, ABM applies either the LRU replacement or the interval-based caching depending on the Looping Reference Indicator, which indicates that how strong temporally localized access pattern is. According to our experiment, ABM exhibits better buffer cache miss ratio than interval-based caching or LRU, especially when the workload exhibits not only sequential but also looping reference property.
One of the main challenges facing web-based multimediacontent creators today is the development of cost-effective digital media content for courseware that is reusable and interoperable. Given this, we propose the de...
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ISBN:
(纸本)0780379659
One of the main challenges facing web-based multimediacontent creators today is the development of cost-effective digital media content for courseware that is reusable and interoperable. Given this, we propose the design and implementation of a model to manage the multimedia and meta-data within a system of related topics in a course that is delivered via electronic lectures. This model not only supports the re-purposing and interchange of a course's digital media content, but also preserves the semantic dependencies and associated media-mapping, of pre-requisite and co-requisite knowledge within a course. Coarse grain or topic-based segmentations of an electronic lecture are used as building blocks to automatically create new, media-rich, electronic lecture experiences of interest to a user and subject to the constraints imposed by the model.
In many areas of commerce, government, academia, and medicine, large collections of digital images are being used. Usually, the only way of searching these collections is by their name, or by browsing which is unpract...
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An integrated, reconfigurable, adaptable and open system for mining, indexing and retrieving multimedia information based on a mobile agent technology scheme is presented. The system consists of three integral subsyst...
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ISBN:
(纸本)0780393317
An integrated, reconfigurable, adaptable and open system for mining, indexing and retrieving multimedia information based on a mobile agent technology scheme is presented. The system consists of three integral subsystems, namely the acquisition, the transformation and the distribution modules. Innovative algorithms are used to extract information from web sources, transform it and deliver it to the end users. The system supports efficient content adaptation mechanisms, textual and visual summarization schemes (both sequential and hierarchical), automatic language translation, ontological representation, visual processing and web-based data mining. Experimental analysis on real-life web sites has been performed to test the efficiency of the proposed scheme and compare it with other approaches presented in the literature.
There is an increasing demand in multimedia information systems for a passage retrieval facility that permits extracting individual excerpts of multimedia documents. In this paper, we propose an effective technique fo...
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There is an increasing demand in multimedia information systems for a passage retrieval facility that permits extracting individual excerpts of multimedia documents. In this paper, we propose an effective technique for multimedia passage retrieval. The approach is based on analyzing the full content of documents for the purpose of retrieving all multimedia passages that satisfy a query description. The proposed approach demonstrates that fast and effective retrieval of multimedia information is possible, despite the large amount of data involved in multimedia documents.
This paper will start by describing OpenSDRM an open-source framework developed for the IST project MOSES., OpenSDRM is used to control the multimediacontent consumption in conjunction with the new IPMPX MPEG-4 propo...
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ISBN:
(纸本)0769521576
This paper will start by describing OpenSDRM an open-source framework developed for the IST project MOSES., OpenSDRM is used to control the multimediacontent consumption in conjunction with the new IPMPX MPEG-4 proposed standard. This architecture, composed by several building blocks, protects the content flow from creation to final user consumption on a specific device. This paper devotes a special attention to the security aspects of the OpenSDRM processes and functions, describing its communication protocols and message exchanges as well as it introduces the security details about the user's digital wallet.
Guaranteed QoS for multimedia applications requires support from the connecting network and the communicating parties. However, in many communications through the Internet, the backbones offer only best-effort service...
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ISBN:
(纸本)0889863806
Guaranteed QoS for multimedia applications requires support from the connecting network and the communicating parties. However, in many communications through the Internet, the backbones offer only best-effort service but are usually over-provisioned and, thus provide sufficient quality. The problems are often in the access networks that may become the bottleneck, especially when they have wireless links. Moreover, current content servers do not support QoS signaling. It would be useful if end hosts could reserve at least local resources at the access network, especially wireless link resources. Additionally, for mobile nodes the continuity of QoS is enhanced if resource signaling can be localized and coupled with mobility management. This paper presents a simple enhancement to RSVP, which allows initial resource reservations and re-reservations due to host mobility to be done locally in an access network.
Efficient file searching is an essential feature in P2P systems. While many current approaches use brute force techniques to search files by meta information (file names, extensions or user-provided tags), the interes...
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Efficient file searching is an essential feature in P2P systems. While many current approaches use brute force techniques to search files by meta information (file names, extensions or user-provided tags), the interest is in implementing techniques that allow content-based search in P2P systems. Recently, clustering techniques have been used for searching text documents to increase the efficiency of document discovery and retrieval. Integrating such techniques into P2P systems is important to enhance searching in P2P file sharing systems. While some effort has been taken for content-based searching for text documents in P2P systems, there has been few research work for applying these techniques to multimediacontent in P2P systems. In this paper, we introduce two P2P content-based clustering techniques for multimedia documents. These techniques are an adaptation of the existing Class-based Semantic Search algorithm for text documents. The proposed algorithms have been integrated into a JXTA-based Overlay P2P platform, and evaluation results are provided. The JXTA-Overlay together with the considered clustering techniques is thus very useful for developing P2P multimedia applications requiring efficient searching of multimediacontents in peer nodes.
The major drawback of interactive retrieval systems is the potential frustration of the user that is caused by an excessive labelling work. Active learning has proven to help solving this issue, by carefully selecting...
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On-demand multimedia is a pervasive part of our lives. content of all types is available from websites such as YouTube, Hulu, and Pandora. Individuals consume this content using home entertainment systems, personal co...
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