Browsing by Subject "quality of service"

Now showing 1 - 4 of 4
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    Assessment of Service Desk Quality at an Academic Health Sciences Library
    (Taylor & Francis, 2016) Blevins, Amy E.; DeBerg, Jen; Kiscaden, Elizabeth; Ruth Lilly Medical Library
    Due to an identified need for formal assessment, a small team of librarians designed and administered a survey to gauge the quality of customer service at their academic health sciences library. Though results did not drive major changes to services, several important improvements were implemented and a process was established to serve as a foundation for future use. This article details the assessment process used and lessons learned during the project.
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    Reliable Video over Software-Defined Networking (RVSDN)
    (IEEE, 2014-12) Owens, Harold II; Durresi, Arjan; Jain, Raj; Department of Computer & Information Science, IU School of Science
    Ensuring end-to-end quality of service for video applications requires the network to choose the most feasible path in terms of bandwidth, delay and jitter. Quality of service can only be ensured if the paths are reliable - perform to specification per request. This paper makes four contributions to research. First, it presents Reliable Video over Software-Defined Networking (RVSDN) which builds upon previous work of Video over Software-Defined Networking (VSDN) to address the issue of finding the most reliable path(s) through the network for video applications. Second, it presents the design and implementation of RVSDN. Third, it presents the experience of integrating RVSDN into ns-3 which is a network simulator used by the research community to simulate and model computer networks. Finally, it presents the results of RVSDN in terms of the number of requests serviced by the network architecture. RVSDN is able to service 31 times more requests than VSDN and MPLS explicit routing when the reliability constraint is 0.995 or greater using aggregation of reliability across network paths.
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    Video over Software Defined Networking
    (Office of the Vice Chancellor for Research, 2013-04-05) Owens II, Harold; Durresi, Arjan
    Supporting end-to-end quality of service (QoS) for video applications requires the network to select optimum path among multiple paths to improve application performance. Multiple network paths from source to destination may be available but due to current network high coupling design identifying alternate paths is difficult. Network architecture, like Integrated services (IntServ), install a single path from source to destination which may not be optimum path for the application. Furthermore, it is an arduous task for video application developers to request service from IntServ. This paper provides three contributions to research on providing end-to-end QoS for video applications. First, it presents video over software defined networking (VSDN) - an architecture that is capable of making optimum path selection utilizing a global network view. Second, it describes the VSDN protocol used by video application developers to request service from VSDN enabled networks. Third, it presents the results of implementing a prototype of VSDN and quantitatively evaluates its behavior. The results show that VSDN has a linear-message complexity.
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    Video over Software-Defined Networking (VSDN)
    (Elsevier, 2015-12) Owens, Harold II; Durresi, Arjan; Department of Computer and Information Science, School of Science
    Supporting end-to-end quality of service (QoS) for real-time interactive video applications, such as video conferencing and distance learning, requires the network to select an optimum path from among multiple paths. Multiple network paths may be available between the source and the destination, but finding an alternative path is difficult because of the high coupling and complex design of the network. Network architectures such as Integrated Services (IntServ) install the path selected by the routing protocol, which may not deliver best-case performance. Furthermore, it is an arduous task for the video application developer to request service from IntServ. We provide three contributions to the literature on providing end-to-end QoS for real-time interactive video applications. First, we present Video over Software-Defined Networking (VSDN), a network architecture that selects the optimum path using a network-wide view. Second, we describe the VSDN protocol that is used by the developer to request QoS from the network. Finally, we present the results of implementing a VSDN prototype and evaluate the behavior of VSDN using message complexity, network throughput, network delay, and network jitter. The message complexity of VSDN is linear.