D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia Service Configuration and Reservation in Heterogenous Environments. Proc. of IEEE International Conference on Distributed Computing Systems (ICDCS 2000.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....require recoding of the gateway itself. This goes against the design goal of flexibility. The gateway should be able to act as an intermediary which only facilitates application level reconfiguration, rather than becoming a centerpiece upon which data transmission is dependent. The QoSProxies in [7] are another approach and address the disadvantages in [3] and [5] The service configuration protocol used by QoSProxies can dynamically match a server with a client request, using an dynamically discovered intermediary transcoder if necessary, such that the final data stream matches the client s ....

D. Xu, D. Wichadakul, and K. Nahrstedt. "Multimedia Service Configuration and Reservation in Heterogeneous Environments", IEEE International Conference on Distributed Computing Systems, 2000.

....run time management aims to combine the local and global management of distributed resources with the run time adaptation of an application. Earlier research principally considered adaptations performed at application level [2, 3] More recent contributions include multi resource solutions [15, 21], using libraries [17] and or additional servers [6] for distributed adaptation and resource management [19] Cooperation between application level adaptations and system level resource management is implemented as middleware [4] or as point solutions for specific resources like computer networks ....

D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia Service Configuration and Reservation in Heterogeneous Environments. In Intl. Conference on Distributed Computing Systems, 2000.

....In some cases of cache hits, the team leader may be farther away from the client than the server is. Hence, a request is redirected to the server only when the redirection results in a less estimated network load. For best effort networks such as the Internet, a resource reservation protocol [12] should be embedded in VCN. We note that video traffics compete with other traffics at routers. To guarantee a soft real time delivery in practice, the client typically buffers more data before initiating the playback. This buffered data are used to absorb fluctuations in network conditions if no ....

D. Xu, D. Wichadakul, and K. Nahrstedt, "Multimedia service configuration and reservation in heterogeneous environments," in Proc. of the 20th International Conference on Distributed Computing Systems (ICDCS 2000.

....Work The provision of quality of service (QoS) guarantees in open environments, such as the internet, is currently an active field of research. In fact, although there is a lot of work dealing with the problem of QoS provision in environments where resources are known and can be controlled [28, 24, 31, 18, 6], no systematic solution has been proposed for environments where there is no knowledge about the amount of available resources. In particular, and as far as we know, there is not a generic system model that adequately characterizes these kind of unpredictable environments, which can be used to ....

....benefit functions specified by the application as a way to optimize resource management. Several middleware architectures can be found. For instance, they deal with heterogeneous environments [24] they propose control based solutions [19] or they use resource brokers to manage system resources [31]. A discussion about the main issues concerning QoS constrained communication can be found in [30] and a comprehensive survey about end to end QoS architectures can be found in [3] We should also mention the IntServ [5] and Di#Serv [4] architectures that were proposed to specifically address the ....

Dongyan Xu, Duangdao Wichadakul, and Klara Nahrstedt. Multimedia service configuration and reservation in heterogeneous environments. In Proceedings of International Conference on Distributed Computing Systems, Taipei, Taiwan, April 2000. 19

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D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia Service Configuration and Reservation in Heterogenous Environments. Proc. of IEEE International Conference on Distributed Computing Systems (ICDCS 2000.

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D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia Service Configuration and Reservation in Heterogeneous Environments. Proceedings of IEEE International Conference on Distributed Computing Systems(ICDCS 2000.

....select an optimal application component graph (application configuration) that best reflects the current status with respect to all triggering sources. These include resource availability, QoS needs and user preferences in an application. The design of the algorithm was proposed by a previous work [9] derived from our past experiences with the 6 Baochun Li et al. project, and we observe that it can be readily applied to this new integrated architecture. Run time Adaptation. For the purpose of run time adaptations, we include a database of application specific adaptation policies and rules ....

Dongyan Xu, Duangdao Wichadakul, and Klara Nahrstedt, "Multimedia Service Configuration and Reservation in Heterogeneous Environments," In Proceedings of 20th International Conference on Distributed Computing Systems (ICDCS 00), April 2000.

....Polymorphism . More precisely, the same distributed multimedia Web services can be delivered in multiple forms and formats, using different application configurations from the service provider to different types of clients, and possibly through an intermediate gateway (infrastructure proxy) [17, 45]. Different application configurations provide various quality levels or similar quality levels but have distinct resource requirements. For example, a simple Video On Demand application on the WWW can have two different configurations. For a powerful desktop client, connected to a high speed LAN, ....

....programming language) It allows users to specify non functional aspects of services (such as QoS specifications) separate from the interface definition. However, QDL and QML does not consider the QoS specifications about multiple possible configurations for the reconfigurable applications. [45] Furthermore, they does not provide any consistency check mechanism to prevent incorrect QoS specifications, such as illegal configurations or mismatched QoS requirements, from injecting into the underlying systems. Most of all, they are not extensible and cannot be used by Web applications ....

D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia Service Configuration and Reservation in Heterogeneous Environments. Proceedings of IEEE International Conference on Distributed Computing Systems(ICDCS

....should adapt itself to execute at a level which provides QoS that is acceptable to the user yet utilizes only as much resources as are currently available. Several recent works have attempted to perform these adaptations for distributed client server applications. The first approach, taken in [1, 4, 7], is to create a QoS aware proxy between the client and server. This proxy transcodes the server data so that it matches the client s reconfigured QoS needs, thus enabling the client to dynamically alter its execution level [2] The second approach is to provide a gateway between the client and a ....

D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia Service Configuration and Reservation in Heterogeneous Environments. ICDCS 2000, 2000. 5

....for the reservation and enforcement of CPU, network bandwidth, and memory resources, respectively. However, there is no coordination among these resource brokers, and no algorithm is proposed to compute multi resource reservation plans to guarantee end to end application level QoS. Finally, in [10], we study the multi resource reservation problem only in the case of chain dependency graph. In this paper, we extend our solution to deal with the more general case of DAG dependency graph. 6 Conclusion In a reservation based environment where every type of resource can be reserved, we need ....

D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia service configuration and reservation in heterogeneous environments. Proceedings of IEEE ICDCS 2000, April 2000.

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D. Xu, D. Wichadakul, and K. Nahrstedt. Multimedia service configuration and reservation in heterogeneous environments. In Proceedings of International Conference on Distributed Computing Systems, Taipei, Taiwan, Apr. 2000.

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