The Internet is an essential resource to an ever-increasing number of businesses and home users. Internet access is increasing dramatically and hence, the need for efficient and effective Web server systems is on the rise. These systems are information engines that are accessed through the Internet by a rapidly growing client base. These systems are expected to provide good performance and high availability to the end user. They are also resilient to failures at both the hardware and software levels. These characteristics make them suitable for servicing the present and future information demands of the end consumer. In recent years, researchers have concentrated on taxonomies of scalable Web server system architectures, and routing and dispatching algorithms for request distribution. However, they have not focused on the classification of commercial products and prototypes, which would be of use to business professionals and software architects. Such a classification would help in selecting appropriate products from the market, based on product characteristics, and designing new products with different combinations of server architectures and dispatching algorithms. Currently, dispatching algorithms are classified as content-blind, content-aware, and Domain Name Server (DNS) scheduling. These classifications are extended, and organized under one tree structure in this thesis. With the help of this extension, this thesis develops a unified product-based taxonomy that identifies product capabilities by relating them to a classification of scalable Web server systems and to the extended taxonomy of dispatching algorithms. As part of a detailed analysis of Web server systems, generic queuing models, which consist of a dispatcher unit and a Web server unit are built. Some performance metrics, such as throughput, server performance, mean queue size, mean waiting time, mean service time and mean response time of these generic queuing models are measured for evaluation. Finally, the correctness of generic queuing models are evaluated with the help of theoretical and simulation analysis.

Zugl.: Diplomarbeit.

Fachhochsch.-Studiengänge Burgenland, Diplomarbeit, 2006--Eisenstadt.

Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineeering and Applied Science, Department of Computer Science, 2009. / Includes bibliographical references.

Technological advancements and digitalization opens up a whole new set of opportunities for manufacturing industries to improve and enhance their effectiveness. As the importance of IT grows in the industry so does the complexity of the systems they use. This requires a countermeasure. IT systems need to be managed and monitored and thus rises the need for tools to perform this task in a swift and effective manner. Because when a plant stands still, time is money.This thesis describes the development of an extension to System Monitor which is used by the company ÅF. System Monitor is a system and troubleshooting tool to monitor the manufacturing execution system PaperLine.System Monitor consists of a service that collects data from PaperLine and its servers, a database for storing the collected data and a web client for presenting the data to the user. The result of the project is an improved version of System Monitor with means to collect and display performance data from servers running on the windows server operating system. In addition general improvements have been made and bugs have been dealt with. The project has been a success for both the author and ÅF.

The thesis deals with enterprise service bus (ESB). In theoretical part there are described ESB and other technologies relevant to this topic. Next there are described advantages and disadvantages of the deployment and mapped current market of ESB solutions. Last chap-ter briefly discusses other technologies recovered for the practical part. The second part deals with the design and implementation ESB using framework SwitchYard. I describe the systems to be integrated, further progress in the development such as preparation envi-ronment, server configuration and description of the most important parts of the developed system. The last chapter deals with the practical part of the evaluation framework. It in-cludes the description of the errors that I have encountered in the development and verbal evaluation on the basis of general ESB functionality described in the theoretical part.

This master thesis is focused on designing the client and the server part of an application for text and multimedia communication between its users. The design takes into account reusing of the components and making them easily embeddable into another application. The project consists of a detailed analysis of communication protocols used for this type of applications, a description of possibilities of the iOS platform and development on this platform. Finally, the implementation and its possible extensions are described.

Chan Pak Hang. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 62-63). / Abstracts in English and Chinese. / Acknowledgement --- p.II / Abstract --- p.III / 摘要 --- p.IV / Chapter Part I. --- An Efficient Disk-Array-Based Server Design for a Multicast Video Streaming System --- p.1 / Chapter Chapter 1 --- Introduction --- p.2 / Chapter Chapter 2 --- Related Works --- p.5 / Chapter Chapter 3 --- The Super-Scalar Architecture --- p.8 / Chapter Chapter 4 --- A GSS-Based Server Design --- p.11 / Chapter Chapter 5 --- An Efficient Server Design --- p.15 / Chapter 5.1 --- The Weighted Segment Group Pairing (WSGP) Scheme --- p.16 / Chapter 5.2 --- Interleaving of Data Blocks --- p.17 / Chapter 5.3 --- First TR Seconds Replication --- p.18 / Chapter 5.4 --- An Integrated Scheduler --- p.19 / Chapter Chapter 6 --- Performance Evaluation --- p.23 / Chapter 6.1 --- Server Capacity --- p.24 / Chapter 6.2 --- Utilization of disk capacity --- p.25 / Chapter Chapter 7 --- Conclusions --- p.26 / Chapter Part II. --- Progressive Redundancy Transmission - A Low-Overhead Fault Tolerant Streaming Protocol for Parallel Video Servers --- p.27 / Chapter Chapter 8 --- Introduction --- p.28 / Chapter Chapter 9 --- Related Works --- p.31 / Chapter Chapter 10 --- System Model --- p.33 / Chapter Chapter 11 --- Forward Erasure Correction --- p.36 / Chapter 11.1 --- System Reliability --- p.36 / Chapter 11.2 --- Bandwidth Overhead --- p.38 / Chapter Chapter 12 --- Progressive Redundancy Transmission --- p.39 / Chapter 12.1 --- System Reliability --- p.40 / Chapter 12.2 --- Modeling the Failure Detection Time --- p.43 / Chapter Chapter 13 --- Performance Evaluation --- p.46 / Chapter 13.1 --- Effect of Detection Time Distribution --- p.46 / Chapter 13.2 --- Bandwidth Overhead Reduction --- p.48 / Chapter 13.3 --- Storage Overhead --- p.50 / Chapter 13.4 --- Scalability --- p.51 / Chapter Chapter 14 --- Conclusions --- p.53 / Appendix --- p.54 / Bibliography --- p.62

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