Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat, "Differentiated multimedia web services using quality aware transcoding," in INFOCOM - Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies, Tel Aviv, Israel, March 2000, IEEE.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... has been recognized in the networking community and the focuses of these studies are network bandwidth allocation and packet delay [18, 29, 58, 59, 65, 74] The methods for ensuring bandwidth usage include delaying or dropping user requests [29, 59, 65] or reducing service qualities [1, 22]. In comparison, Neptune focuses on achieving efficient resource utilization and providing service differentiation for cluster based services in which contents are dynamically generated and aggregated. Recent advances in OS research have developed approaches to provide QoS support at OS kernel ....

S. Chandra, C. S. Ellis, and A. Vahdat. Differentiated Multimedia Web Services Using Quality Aware Transcoding. In Proc. of IEEE INFOCOM '2000.

....solver; with better interfaces for load and resource statistics ( proc contributes most of the latency to our resource predictors) and by replacing the middleware server with a library implementation. 5 Related work This work is most closely related to previous work on fidelity adaptation [7, 9, 16, 15, 30]. We have generalized these previous notions of fidelity, which only measured data degradation, to include arbitrary runtime parameters of an application. Our system and API also move the burden of adaptation out of the application: where other systems expect applications to specify their resource ....

S. Chandra, C. Ellis, and A. Vahdat. Differentiated Multimedia Web Services Using Quality Aware Transcoding. In Proc. 19th Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings (INFOCOM '00), pages 961-- 969, Tel Aviv, Israel, Mar. 2000.

....There are three possible techniques for handling such diverse client needs. Maintain all possible versions of the object at the server, one for each type of device. Store only the high fidelity version of the object and employ online transcoding to dynamically produce low fidelity versions [10]. Employ an intermediate proxy that uses a combination of transcoding and caching to meet client needs. Server based techniques for managing the diversity in client needs have certain limitations. Maintaining multiple pre computed versions of each object can be cumbersome, especially in ....

Surender Chandra, C. S. E. and A. Vahdat: 2000, 'Differentiated Multimedia Web Services Using Quality Aware Transcoding'. In: INFO COMM.

....There are three possible techniques for handling such diverse client needs. Maintain all possible versions of the object at the server, one for each type of device. Store only the high fidelity version of the object and employ online transcoding to dynamically produce low fidelity versions [9]. Employ an intermediate proxy that uses a combination of transcoding and caching to meet client needs. Server based techniques for managing the diversity in client needs have certain limitations. Maintaining multiple pre computed versions of each object can be cumbersome, especially in ....

C. S. E. Surender Chandra and A. Vahdat. Differentiated multimedia web services using quality aware transcoding. In INFOCOMM, 2000.

....adaptation is to render contents of different levels of fidelity. The adaptiveness can be based on the server load, available network bandwidth, and the end user s rendering capacity. Abdelzaher, et al. [1] proposed content adaptation for web servers under various server load. Chandra, et al. [9] proposed adaptive transcoding scheme based on user type (mobile, stationary) and network capacity. Both of these schemes provide QoS through service differentiation. However, none of these schemes have addressed how to apply content adaptation to relieve backend server overload or reduce cost ....

Chandra, C. Ellis, and A. Vahdat, "Differentiated Multimedia Web Services Using Quality Aware Transcoding," In Proceedings of the IEEE Infocom 2000.

....There are three possible techniques for handling such diverse client needs. Maintain all possible versions of the object at the server, one for each type of device. Store only the high fidelity version of the object and employ online transcoding to dynamically produce low fidelity versions [9]. Employ an intermediate proxy that uses a combination of transcoding and caching to meet client needs. Server based techniques for managing the diversity in client needs have certain limitations. Maintaining multiple pre computed versions of each object can be cumbersome, especially in ....

C. S. E. Surender Chandra and A. Vahdat. Differentiated multimedia web services using quality aware transcoding. In INFOCOMM, 2000.

....management policies that take this approach. The most straightforward form of service degradation is to reduce the quality of static Web content, such as by reducing the resolution or compression quality of images delivered to clients. This approach has been considered in a number of projects [45, 2, 24], and has been shown to be an effective form of overload control. In many cases the goal of image quality degradation is to reduce network bandwidth consumption on the server, though this may have other effects as well, such as memory savings. A more sophisticated example of service degradation ....

....its front page with simple HTML page that that could be contained in a single Ethernet packet [83] However, this was an extreme measure that was put in place manually by the system administrators. A better approach would be to degrade service gracefully and automatically in response to load. In [24], for example, the Web server degrades the compression quality of JPEG images when bandwidth utilization exceeds a target. In some cases it is possible for a service to make performance tradeoffs in terms of the freshness, consistency, or completeness of data delivered to clients. Brewer and Fox ....

[Article contains additional citation context not shown here]

S. Chandra, C. S. Ellis, and A. Vahdat. Differentiated multimedia Web services using quality aware transcoding. In Proceedings of IEEE INFOCOM 2000.

.... has been recognized in the networking community and the focus of these researches is the network bandwidth allocation and packet delay [5, 11, 15, 16, 19, 24] The methods for ensuring bandwidth usage include delaying or dropping user requests [11, 16, 19] or reducing service qualities [8]. The design and implementation of our system has been leveraged in certain parts by those results. Recent advances in OS research have developed approaches to provide efficient resource management and service differentiation at OS kernel level [4, 6, 12, 17, 26] Our work can be enhanced by those ....

S. Chandra, C. S. Ellis, and A. Vahdat. Differentiated Multimedia Web Services Using Quality Aware Transcoding. In Proc. of IEEE INFOCOM'

....system more accurately than by applications or hardware alone. Flinn et al. 13] developed a user level middleware to filter and transcode data that applications fetch. Transcoding changes data quality in order for applications to use the minimum amount of energy when processing it. Vahdat et al. [6] and De Lara et al. 10] also concerned themselves with transcoding. A few previous papers considered application OS interactions intended to optimize for power and energy [25, 13] Clusters. Some of the research mentioned above can be used to optimize each node of a cluster independently, so we ....

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat. Differentiated multimedia web services using quality aware transcoding. In Proceedings of INFOCOM

....energy conservation has been focused on laptop computers and embedded and hand held devices. Research on these devices has included optimizations for the processor (e.g. 33, 16, 18] for the memory (e.g. 22, 32] for the disk (e.g. 23, 11, 17] for transcoding the content they receive (e.g. [13, 10, 6]) and for offloading computation from them (e.g. 28, 21] All of these studies considered single processor battery operated devices. We are not aware of any work, besides ours, involving power and energy optimizations for clusters. System level techniques. The OS has been the target of power ....

....more accurately than by applications alone or hardware alone. Flinn et al. 13] developed a user level middleware to filter and transcode data that applications fetch. Transcoding changes data quality in order for applications to use the minimum amount of energy when processing it. Vahdat et al. [6] and De Lara et al. 10] also concerned themselves with transcoding. Application and application OS techniques. We are not aware of any power or energy optimization works that do not rely on some level of runtime OS or hardware support; our power aware WWW server seems to be the first example of ....

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat. Differentiated multimedia web services using quality aware transcoding. In Proceedings of INFOCOM 2000 - Nineteenth Annual Joint Conference of the IEEE Computer And Communications Societies, 2000.

....classes [8] 9] 10] The basic idea is to assign a portion of total outgoing bandwidth to each request class and ensure that each class does not overuse its share. The methods for ensuring bandwidth usage include delaying or dropping user requests [8] 9] 10] or reducing service qualities [11]. In this paper, we focus on service differentiation in terms of the allocation of CPU and disk I O capacities instead of network bandwidth. Many e commerce or e service sites rely heavily on database operations and dynamic page generations. CPU and I O resources, other than network bandwidth, are ....

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat, "Differentiated Multimedia Web Services Using Quality Aware Transcoding," in Proceedings of IEEE Infocom 2000, Mar. 2000.

....computing resources are allocated based on client states and request semantics. The importance of providing differentiated service qualities has been recognized in the networking community and the focus of these researches is the network bandwidth allocation among request classes [7] 8] 9] [10]. The basic idea is to assign a portion of total outgoing bandwidth to each request class and ensure that each class does not overuse its share. The methods for ensuring bandwidth usage include delaying or dropping user requests [7] 8] 9] or reducing service qualities [10] Instead of ....

....[7] 8] 9] 10] The basic idea is to assign a portion of total outgoing bandwidth to each request class and ensure that each class does not overuse its share. The methods for ensuring bandwidth usage include delaying or dropping user requests [7] 8] 9] or reducing service qualities [10]. Instead of enforcing bandwidth usage upper bounds, the work by Almeida et al. 11] ensures higher priority request classes get more sufficient bandwidth by applying a kernel level scheduling algorithm for static page requests. This paper focuses on service differentiation in terms of the ....

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat, "Differentiated Multimedia Web Services Using Quality Aware Transcoding," in Proceedings of IEEE Infocom 2000, Mar. 2000.

....Multimedia Web Services Using Quality Aware Transcoding It has been estimated that approximately 77 of the data bytes accessed through the WWW are those of multimedia content, which include images, audio and video clips. While images account for approximately 67 of that 77 [15] In [9], they present the idea of transcoding the multimedia objects that entail almost 4 5 of all WWW traffic. The transcoding allows the server to decrease the amount of data being transmitted over the network. 9] states that the chief constraint to the ability to serve many users is the limited net ....

....audio and video clips. While images account for approximately 67 of that 77 [15] In [9] they present the idea of transcoding the multimedia objects that entail almost 4 5 of all WWW traffic. The transcoding allows the server to decrease the amount of data being transmitted over the network. [9] states that the chief constraint to the ability to serve many users is the limited net bandwidth available to the wide area network. Hence the most important consideration for transcoding is the quality of the images versus the size tradeoff, with the most advantageous situation being an image s ....

[Article contains additional citation context not shown here]

Chandra, S., Ellis, C., and Vahdat, A., Differentiated Multimedia Web Services Using Quality Aware Transcoding, INFOCOM 2000 - Nineteenth Annual Joint Conference of the IEEE Computer And Communications Societies, March, 2000.

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Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat, "Differentiated multimedia web services using quality aware transcoding," in INFOCOM - Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies, Tel Aviv, Israel, March 2000, IEEE.

No context found.

S. Chandra, C. Schlatter Ellis and A. Vahdat. Differentiated Multimedia Web Services Using Quality Aware Transcoding. In Proceedings of IEEE INFOCOM 2000.

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S. Chandra, C. S. Ellis, and A. Vahdat, "Differentiated multimedia web services using quality aware transcoding," in Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies (INFOCOM),(TelAviv, Israel), Mar. 2000.

....informed transcoding technique in customizing the multimedia object for the prevailing network conditions. We show how a web server can dynamically allocate available bandwidth among different client classes, while delivering a high degree of information content (Quality Factor) for all clients [26, 25]. We also demonstrate that it is possible to use informed transcoding techniques in a network proxy to balance the demand for quality of multimedia content while reducing consumed network bandwidth and server CPU overhead 8 [24] 3. We also demonstrate techniques that allow application ....

....transcoding technique in customizing the multimedia object for the prevailing conditions. In Chapter 5, we show how a web server can dynamically allocate available bandwidth among different client classes, while delivering a high degree of information content (Quality Factor) for all clients [26, 25]. In Chapter 6, we investigate the potential benefits and overhead in providing differentiated service for the web, using a proxy server that performs quality aware, informed transcoding for mobile end users accessing the web via wireless networks. We demonstrate that it is possible to use ....

[Article contains additional citation context not shown here]

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat. Differentiated multimedia web services using quality aware transcoding. In INFOCOM - Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies, Tel Aviv, Israel, March 2000. IEEE.

....demonstration that it is possible to use informed transcoding techniques to provide differentiated service. We show how a web server can dynamically allocate available bandwidth among different client classes, while delivering a high degree of information content (Quality Factor) for all clients [6]. We also show how a web server can dynamically serve different versions of multimedia objects to clients accessing the web, based on network performance, to provide tolerable latency and a satisfying web experience [7] The rest of the paper is organized as follows: Section II reviews our ....

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat, "Differentiated multimedia web services using quality aware transcoding," in INFOCOM - Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies, Tel Aviv, Israel, March 2000, IEEE.

....possible cost. On the other hand, consumers using high speed networks and high quality displays may desire to view the multimedia images at the highest quality. Further, consumers using slow networks want to view the images as quickly as possible. Transcoding has been used in a number of systems [3, 4, 11, 12, 26, 23, 22, 21, 19, 27, 8, 17, 1, 28] to serve the same multimedia object at different quality levels to different users. Transcoding is a transformation that converts a multimedia object from one form to another, frequently trading object fidelity for size. Some of the transcoding choices for images include color reduction, spatial ....

....to use informed transcoding techniques to balance the demand for quality of multimedia content while reducing consumed network bandwidth and server CPU overhead. We also utilized informed transcoding in a web service that offers differentiated Quality of Service for different client classes [4]. We demonstrated that it is possible to use informed transcoding techniques to provide differentiated service and to dynamically allocate available bandwidth among different client classes, while delivering a high degree of information content (quality factor) for all clients. 6 Conclusions ....

Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat. Differentiated multimedia web services using quality aware transcoding. In INFOCOM - Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies, Tel Aviv, Israel, March 2000. IEEE.

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S. Chandra, C. Ellis, and A. Vahdat. Differentiated multimedia Web services using quality aware transcoding. In IEEE Infocom, Tel-Aviv, Israel, March 2000.

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S. Chandra, C. Ellis, and A. Vahdat. Differentiated Multimedia Web Services Using Quality Aware Transcoding. In Proc. 19th Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings (INFOCOM '00), pages 961-- 969, Tel Aviv, Israel, Mar. 2000.

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S. Chandra, C. Ellis, A. Vahdat, "Differentiated Multimedia Web Services Using Quality Aware Transcoding ", in Proc. 19th Annual Joint Conference Of the IEEE Computer And Communications Societies (INFOCOM '00),December 2000.

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S. Chandra, C. S. Ellis, and A. Vahdat. Differentiated Multimedia Web Services Using Quality Aware Transcoding. In Proc. of IEEE INFOCOM'2000.

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S. Chandra, C. S. Ellis and A. Vahdat, "Differentiated Multimedia Web Services using Quality Aware Transcoding," Proceedings of the Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies (INFOCOM), Tel Aviv, Israel, March 2000.

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S. Chandra, C. S. Ellis, and A. Vahdat. Differentiated multimedia Web services using quality aware transcoding. In Proceedings of IEEE INFOCOM 2000.

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S. Chandra, C. S. Ellis, , and A. Vahdat. Differentiated multimedia web services using quality aware transcoding. In INFOCOM 2000.

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S. Chandra, C. S. Ellis, and A. Vahdat. Differentiated multimedia web services using quality aware transcoding. In INFOCOM - Nineteenth Annual Joint Conference Of The IEEE Computer And Communications Societies, Tel Aviv, Israel, 2000.

No context found.

S. Chandra, C. S. Ellis and A. Vahdat. Differentiated multimedia Web services using quality aware transcoding. Proceedings of INFOCOM 2000.

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Surendar Chandra, Carla Schlatter Ellis, and Amin Vahdat, "Differentiated Multimedia Web Services Using Quality Aware Transcoding," Proceedings of INFOCOM 2000 - Nineteenth Annual Joint Conference of the IEEE Computer And Communications Societies, March 2000.

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