The Guaranteed Frame Rate service category is currently under discussion for incorporation into the specification documents of the ATM-Forum. The concept of the GFR service is to provide a minimum service guarantee to classical best-effort services, taking into account the frame-based nature of todays data-traffic. In this paper we present a discrete-time analysis of the GFR service and discuss...

Digital out-of-home media and pervasive new technologies are bringing the internet experience into public spaces and stepping up the pace with which brands and products, as well as their virtual representations, penetrate urban environments. This article explores the phenomenon of todays pervasive advertising, as well as related perceptual foundations, and puts forward a typology for describing...

The emergence of mobile applications to execute sensitive operations has brought a myriad of security threats to both enterprises and users. In order to benefit from the large potential in smartphones there is a need to manage the risks arising from threats, while maintaining an easy interface for the users. In this paper we investigate the use of Trusted Platform Model (TPM) 2.0 to develop a s...

New application domains cause todays database sizes to grow rapidly, posing great demands on technology. Data fragmentation facilitates techniques (like distribution, parallelization, and main-memory computing) meeting these demands. Also, fragmentation might help improving efficient processing of query types such as top N. Database design and query optimization require a good notion of the cos...

Softwares ability to adapt at run-time to changing user needs, system intrusions or faults, changing operational environment, and resource variability has been proposed as a means to cope with the complexity of todays softwareintensive systems. Such self-adaptive systems can configure and reconfigure themselves, augment their functionality, continually optimise themselves, protect themselves, a...

Direct networks have become a popular way to interconnect processing nodes of todays larger commercial and research multiprocessors. The design of such direct networks is important, since it has a large eeect on the performance, cost, and the scalability of the system. The behavior of a direct network is determined primarily by how it does switching, routing and ow-control. This survey article ...

While standard processors achieve supercomputer performance , a performance gap exists between the interconnect of MPP's and COTS. Standard solutions like Ethernet can not keep up with the demand for high speed communication of todays powerful CPU's. Hence, high speed interconnects have an important impact on a cluster's performance. While standard solutions for processing nodes exist, communic...

Firewalls are a cornerstone of todays security infrastructure for networks. Their configuration, implementing a firewall policy, is inherently complex, hard to understand, and difficult to validate. We present a substantial case study performed with the model-based testing tool HOL-TestGen. Based on a formal model of firewalls and their policies in higher-order logic (HOL), we first present a d...

Aspect oriented programming has been proposed as a way to improve modularity of software systems by allowing encapsulation of cross-cutting concerns. To do so, aspects specify where new functionality should apply using pointcuts. Unfortunately todays mainstream aspect oriented languages suffer from pointcut languages where pointcut declarations result in a high coupling between aspect and base ...