Pubs:2001

<bibtex> @inproceedings{267, author={Mos,A. ; Murphy,J.}, title={Performance Monitoring of JAVA Component-Oriented Distributed Applications}, booktitle={IEEE 9th International Conference on Software,Telecommunication & Computer Networks}, year={2001}, abstract={We present a framework for monitoring the performance of component oriented distributed applications based on the Enterprise Java Beans specification. The environment leverages EJB architecture to monitor existing applications in real-time and to provide detailed run-time information that help identify performance hotspots at an object-oriented level. It is non-intrusive, portable across all EJB compliant application servers and easily extendable to accommodate new data-acquisition or graphical presentation components. Current status of the work serves as proof of concept and a complete implementation is under development.}, keywords={performance, monitoring, EJB, component-oriented, distributed systems}, pdf={performance monitoring.pdf}, } </bibtex> <bibtex> @inproceedings{268, author={Hava-Muntean,C.;McManis,J.;Murphy,J.}, title={The Influence of Web Page Images on the Performance of Web Servers}, booktitle={International Confrence on Networking}, year={2001}, abstract={In recent years World Wide Web traffic has shown phenomenal growth. The main causes are the continuing increase in the number of people navigating the Internet and the creation of millions of new Web sites. In addition, the structure of Web pages has become more complex, including not only HTML files but also other components. This has affected both the download times of Web pages and the network bandwidth required. The goal of our research is to monitor the download times of Web pages from different Web sites, and to find out to what extent the images contained in these Web pages influence these times. We also suggest some possible ways of decreasing the bandwidth requirements and download times of complex Web pages.}, keywords={Web Servers}, pdf={influence of web page.pdf}, } </bibtex> <bibtex> @inproceedings{269, author={Mos,A.;Murphy,J.}, title={New Methods for Performance Monitoring of J2EE Applications Servers}, booktitle={IEEE 8th International Conference on Telecommunications}, year={2001}, abstract={There is a growing need for high performance enterprise distributed systems that provide the scalability and availability required by modern enterprise portals and ecommerce systems. New technologies such as Enterprise Java Beans help building these systems by providing the framework to support the increasingly complex applications. Their performance, however, is not guaranteed by the technology itself and it is mostly the responsibility of the developers to build the application so that it meets the required performance needs. We present a number of approaches for monitoring existing Enterprise Java Beans applications in order to help the developers identify performance problems at an object-oriented level.}, keywords={Applications Servers}, pdf={new methods.pdf}, } </bibtex> <bibtex> @inproceedings{270, author={Hava-Muntean,C.;McManis,J.; Murphy,J.}, title={A New Dynamic Web Server}, booktitle={8th International Conference on Telecommunication}, year={2001}, abstract={The growth of traffic on the Internet and the explosion in the number of Web sites created in recent years make Web server performance an important issue for Web site designers. To improve the server's performance, it is necessary to determine the main factors affecting it before proposing new solutions for Web server design. Here we first present some experimental results on factors which influence Web server performance. We show how the number of concurrent clients accessing the server and the overall network traffic dynamics affect the performance. The details of a Web page’s composition are also studied to determine their effect on performance. Then we describe a new approach for developing a Web server, in which the server takes its performance as the clients see it into account and dynamically generates the requested Web pages. Their content depends on the traffic conditions and client capabilities. Some results are described to show the feasibility of our proposed design.}, keywords={Web Servers}, pdf={new dynamic.pdf}, } </bibtex> <bibtex> @inproceedings{271, author={Nowicki,E.;Murphy,J.}, title={Resource Allocation for Interactive traffic classes over GPRS Network}, booktitle={IEE 17th UK Teletraffic Symposium}, year={2001}, abstract={The General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly simplify wireless access to packet data networks, e.g., to the Internet, to the corporate LAN or to the mobile portals. It applies a packet radio standard to transfer user data packets in a well-organized way between Mobile Stations (MS) and external packet data networks. The introduction of guaranteed performance services in GPRS networks requires detailed studies of the resource allocation and service integration issue. This paper proposes some different schemes of allocating the physical channels to mobile stations. We consider the integration of voice and data over Time Division Multiple Access wireless cellular networks. We describe different radio resource allocation algorithms, and describe their similarities and differences in the context of GSM and GPRS networks. However these algorithms can be used for diversified types of wireless networks. In this paper we consider the interactive best effort traffic class as one of the most important traffic classes in GPRS.}, keywords={GPRS }, pdf={rsource allocation.pdf}, } </bibtex> <bibtex> @inproceedings{272, author={Hava-Muntean,C.;McManis,J.; Murphy,J.;Murphy,L.}, title={A Client-Oriented Dynamic Web Server}, booktitle={IEE 17th UK Teletraffic Symposium}, year={2001}, abstract={The cost of computer systems has decreased continuously in recent years, leading to an exponential growth in the number of computer users. In such an environment, more and more Web servers have been created offering many types of information. As a result Internet traffic has grown significantly, affecting the quality of the services offered by the Web servers. We propose a new approach for designing Web servers, which takes into account client requirements and constraints, and whose implementation is based on Java servlet and applet technology. This client-orientated Web server classifies each client into one of a number of pre-defined categories. The Web page generated for a client then depends on the client's current category. A Web page generated in this way may differ from one generated for another client in its content, number of images, graphic design and structure.}, keywords={Web Servers}, pdf={Client Oriented.pdf}, } </bibtex> <bibtex> @inproceedings{350, author={M.Narbutt;L.Murphy}, title={Adaptive Playout Buffering for H.323 Voice over IP applications}, booktitle={Irish Signals & Systems Conference 2001}, year={2001}, abstract={In this paper we investigate the performance of various buffer algorithms that might be implemented in H.323 VoIP applications. The main objective of those algorithms is to minimize effect of the delay jitter. We have tested those algorithms in the Internet using H.323 VoIP terminals. Our results show that the algorithm proposed by us can achieve the lowest rate of lost packets while adding acceptably small delays.}, keywords={VoIP,Internet}, pdf={adaptive playout.pdf}, } </bibtex>