1,720,978 research outputs found
A NOVEL DYNAMIC AND SCALABLE CACHING ALGORITHM OF PROXY SERVER FOR MULTIMEDIA OBJECTS
No full textThis paper presents a novel dynamic and scalable caching algorithm of proxy server with a finite storage size for multimedia objects. Among the multimedia such as text, image, audio and video, video is a dominant component in terms of the performance of proxy server due to its traffic characteristics. For the fast caching process, caching sequences for videos are obtained to decrease both the buffer size and the required bandwidth and saved into metatiles in advance. Then, we present a novel caching and replacing algorithms for Multimedia objects based on the metatiles. Finally, experimental results are provided to show the superior performance of the proposed algorithm.X111Nsciescopu
METATILE-BASED SCALABLE CACHING AND DYNAMIC REPLACING ALGORITHMS FOR MULTIPLE VIDEOS OVER QUALITY-OF-SERVICE NETWORKS
No full textThis paper presents metafile-based scalable caching and dynamic replacing algorithms for multiple videos over quality-of-service networks. A metafile for each video includes the cached-frame sequence, which is made by scalable caching algorithm minimizing client's buffer size and channel bandwidth under the general video traffic condition. Based on the metafiles, we propose a caching algorithm for multiple videos to effectively reduce both the buffer size and the required bandwidth and replacing algorithm to dynamically update the cached frames when user access pattern changes. Finally, experimental results are provided to compare the proposed algorithms with various existing caching and replacing algorithms.X114sciescopu
SCALABLE PROXY CACHING ALGORITHM MINIMIZING CLIENT'S BUFFER SIZE AND CHANNEL BANDWIDTH
No full textThis paper presents a scalable caching algorithm of proxy server with the finite storage size minimizing client's buffer size and constant-bit-rate channel bandwidth. Under the general video traffic condition, it is observed that the amount of decreased client's buffer size and channel bandwidth after caching a video frame depends on the relative frame position in the time axis as well as the frame size. Based on this fact, we propose an effective caching algorithm to select the cached frames by using the normalized buffer size. Finally, experimental results are provided to show the superior performance of the proposed algorithm. (c) 2005 Elsevier Inc. All rights reserved.X115sciescopu
APPLICATION LAYER MULTICAST TREE FOR REAL-TIME MEDIA DELIVERY
No full textThis paper presents an application layer multicast tree to minimize the average time delay between the sender and end-systems for the real-time media delivery. The proposed algorithm also takes into account the computing power and the network condition of each end-system as a control variable in order to avoid the undesirable case that end-systems are overloaded considering their limited resources. The multicast tree is constructed by clustering and modified Dijkstra's algorithms. Finally, we provide the experimental result and compare the proposed algorithm with other algorithms to show that it can provide an effective solution. (C) 2005 Elsevier B.V. All rights reserved.119sciescopu
Overlay real-time video multicast system
No full textIn this paper. we present an effective overlay real-time video multicast system over the Internet The proposed system effectively integrates overlay multicast technology and video compression technology Overlay multicast tree and target bit rate are determined to satisfy the given average delay constraint. and H263+ rate control is implemented to enhance the human visual perceptual quality Over the multicast tree Finally. experimental results are provided to show the performance of the proposed overlay video multicast system over the InternetX11sciescopu
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A neural network approach based on interference pattern analysis: Application to an autoalignment method for the focusing unit of NFR system
No full textFrom the viewpoint of assembly, evaluation results and an autoalignment method for the focusing unit (FU) of a near-field recording (NFR) system are proposed. Generally, the size of the focusing unit composed of the objective lens and the solid immersion lens is smaller than that of the conventional focusing unit. Hence there are difficulties in the precise assembly of the small focusing unit. We developed an evaluation system with an interferometer and evaluated some focusing unit samples, then a tolerance analysis of the assembly error between the SIL and the objective lens and an interference pattern analysis of the assembly error were carried out. A pattern recognition method using a neural network is presented with features, which were extracted from interference patterns due to errors in the FU
Translation of polioviral mRNA is inhibited by cleavage of polypyrimidine tract-binding proteins executed by polioviral 3C(pro)
No full textThe translation of polioviral mRNA occurs through an internal ribosomal entry site (IRES). Several RNA-binding proteins, such as polypyrimidine tract-binding protein (PTB) and poly (rC)-binding protein (PCBP), are required for the poliovirus IRES-dependent translation. Here we report that a poliovirus protein, 3C(pro) (and/or 3CD(pro)), cleaves PTB isoforms (PTB1, PTB2, and PTB4). Three 3C(pro) target sites (one major target site and two minor target sites) exist in PTBs. PTB fragments generated by poliovirus infection are redistributed to the cytoplasm from the nucleus, where most of the intact PTBs are localized. Moreover, these PTB fragments inhibit polioviral IRES-dependent translation in a cell-based assay system. We speculate that the proteolytic cleavage of PTBs may contribute to the molecular switching from translation to replication of polioviral RNA.
Evaluation and autoalignment method of the focusing unit for a near-field optical recording system
No full textEvaluation results and an autoalignment method for an optical head of a near-field recoding (NFR) system are presented. The focusing unit is an optical head of a NFR system and is composed of a solid immersion lens (SIL) and an objective lens (OL). Generally, the size of the focusing unit is smaller than that of the conventional optical recording head. Hence there are difficulties in assembling the small focusing unit precisely and a novel method for an effective assembly is required. We compose an evaluation system with an interferometer and evaluate some focusing unit samples aligned and assembled manually and present the obtained results. We also propose a conceptual method of autoalignment to assemble the focusing unit well by a pattern recognition using a neural network. Using the conventional optical tool, Code V, a tolerance analysis of the assembly error between the SIL and the objective lens and an interference pattern analysis for the assembly error are executed. Then, through an analysis of the simulation results, the autoalignment methodology using a neural network approach is proposed. (C) 2004 Society of Photo-Optical Instrumentation Engineers.This work was supported by the Ministry of Commerce,
Industry and Energy of Korea
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