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The ever-increasing requirements for performance, flexibility, and robustness are imposing a severe strain on the Internet's stagnated architecture. Network virtualization arises as a potential solution for improving the current situation by letting multiple networks with different requirements, architectures and protocols to coexist and share the same infrastructure in an independent way. These advantages...
The topic of this paper is about prediction of performance anomalies caused by software aging. We have developed a framework for detection of performance anomalies that is targeted to web and component-based applications. In this study, we selected some amount of historical data previously collected and we conducted a correlation analysis with this data. The resulting dataset was then submitted to...
Traffic monitoring and analysis is of critical importance for managing and designing modern computer networks, and constitutes nowadays a very active research field. In most of their studies, researchers use techniques and tools that follow a statistical approach to obtain a deeper knowledge about the traffic behaviour. Network administrators also find great value in statistical analysis tools. Many...
This paper presents the design of a HTTP Adaptive Streaming WebTV Client, featuring smooth media Rate Adaptation, context Personalization, fast program channel switching and Terminal/Network Portability capabilities. The QoS-Awareness during streaming is achieved dynamically by a regulating technique that takes into account network conditions, user's device capabilities and the context of viewing...
This paper presents a web application designed to allow better workload distribution during a semester. The tool was designed to face the new goals that are required for teachers that work within new methods that are fostered by the Bologna Treaty implementation. The tool can help course administrators to improve the effect of some extra-initiatives (talks, workshops, tours, short courses, amongst...
The Internet has witnessed a steady and widespread increase in available idle computing cycles and computing resources in general. Such available cycles simultaneously allow and foster the increase in development of existing and new computationally demanding applications, driven by algorithm complexity, intensive data processing, or both. Available cycles may be harvested from several scenarios, ranging...
This article presents a conceptual model of a new information system that enhances the formation of inter-organizational networks and whose objective is to share information of business opportunities between members of a network. It is also a framework of inter-organizational cooperation as a competitive factor and the role of information technology can take in the development of cooperation networks.
Timetable Selector is an application built to ease the selection of a timetable in FEUP's information system. A server uses HTTP to navigate through the information system's web pages, artificial intelligence to select the appropriate hyperlinks and relies on regular expressions to interpret HTML and collect relevant knowledge. Further functionality allows the user to find adequate combinations from...
In this paper we propose a new conceptual model of e-Local Government for the Portuguese municipalities of small population - less than 10,000 residents - supported by wireless technologies. The proposed model allows evaluating the degree of digitization of the interactive process of the municipality and its residents. Thus, a municipality may implement the proposed model of e-government to undertake...
This paper describes an implementation in hardware of Internet Protocol version 4. Routing and addressing features were integrated with Network Interfaces and synthesized to a Stratix II FPGA device. Our work showed two implementations of a full duplex Internet Protocol version 4. The first implementation consists in a Reference design and the second uses the same design but with more buffer space...
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