This paper presents a novel degressive error protection (DEP) algorithm adaptive to time varying packet loss rate for robustly transporting MPEG-4 fine granularity scalability (FGS) bit-stream over the packet erasure ...
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This paper presents a novel degressive error protection (DEP) algorithm adaptive to time varying packet loss rate for robustly transporting MPEG-4 fine granularity scalability (FGS) bit-stream over the packet erasure networks. By exploiting the embedded nature of FGS enhancement-layer bit-stream, a rate-distortion (R-D) optimization framework is developed to optimally partition the FGS enhancement-layer bit-stream into blocks and then to apply DEP to blocks by forward error correction (FEC). Experimental results show that this algorithm achieves graceful degradation of video quality in a wide range of packet loss rates.
We propose an adaptive unequal error protection scheme to help protect a video stream over the Internet. The data partition approach and the resynchronization marker are applied to generate two types of packets with d...
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We propose an adaptive unequal error protection scheme to help protect a video stream over the Internet. The data partition approach and the resynchronization marker are applied to generate two types of packets with different importance. Our scheme is very adaptive to network traffic conditions and can be easily implemented via software. With the proposed scheme, more protection is provided for the more important packets. The final quality can therefore be improved at a higher packet loss ratio.
The demand for a live video over the Internet and wireless links has grown rapidly. Therefore, it is very important to design a video compression system adaptive to variable network conditions. We propose an adaptive ...
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The demand for a live video over the Internet and wireless links has grown rapidly. Therefore, it is very important to design a video compression system adaptive to variable network conditions. We propose an adaptive rate control scheme, which can be applied to design a video compression system adaptive to the available channel bandwidth. This scheme is better than existing schemes in the sense that the coding process is adaptive to the network condition, fewer frames are skipped, and the average PSNR is usually improved.
In studying actual Web searching by the public at large, we analyzed over one million Web queries by users of the Excite search engine. We found that most people use few search terms, few modified queries, view few We...
In studying actual Web searching by the public at large, we analyzed over one million Web queries by users of the Excite search engine. We found that most people use few search terms, few modified queries, view few Web pages, and rarely use advanced search features. A small number of search terms are used with high frequency, and a great many terms are unique; the language of Web queries is distinctive. Queries about recreation and entertainment rank highest. Findings are compared to data from two other large studies of Web queries. This study provides an insight into the public practices and choices in Web searching.
作者：
Vacca, John R.An information technology consultant and internationally known author based in Pomeroy
Ohio. Since 1982 he has written 28 books and more than 340 articles in the areas of Internet and intranet security programming systems development rapid application development multimedia and the Internet. John was also a configuration management specialist computer specialist and the computer security official for NASA's space station program (Freedom) and the International Space Station Program from 1988 until his early retirement from NASA in 1995. He can be reached at jvacca@***
Since the summer of 1998, U.S.- based multinationals have separately geared up for an unprecedented legal wrangle with Europe over the issue of personal data privacy. In some industry sectors, the problem may escalate...
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Since the summer of 1998, U.S.- based multinationals have separately geared up for an unprecedented legal wrangle with Europe over the issue of personal data privacy. In some industry sectors, the problem may escalate into a complex trade war that could ultimately paralyze the transfer and handling of sensitive personal data between the United States and all European countries.
A modeling approach is introduced in this paper to capture the real characteristics of the WWW traffic, using a combination of Box-Jenkins models with seasonality removal. Fourier analysis and standardization are used...
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Hierarchical WWW cache formation which provides both higher hit rates and saves overall bandwidth consumption through fetching WWW objects and periodically redistributing them among member caches is proposed as an app...
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The Internet holds vast stores of information pertaining to pollution prevention and environmental issues, and with each day more is added. Yet, as this storehouse grows, the difficulty of finding specific information...
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