Abstract
This paper presents the determination of the unsaturated permeability of a carbon fibre woven fabric using an experimental method of constant injection pressure and radial flow. Two effects in permeability measurement are reported: the error introduced by assuming constant injection pressure and the evolution of permeability dispersion with volume fraction. For the first, a simple approach that uses a set of values instead of just one to define the injection pressure is proposed. For the second, results showed a reduction in the dispersion with higher fibre volume fractions, which is believed to be due to the reduction of the variability of the size of the pores of the reinforcement.

Abstract

Abstract
Typical computing systems based on general purpose processors (GPPs) can be extended with coarse-grained reconfigurable arrays (CGRAs) to provide higher performance and/or energy savings. In order for applications to take advantage of these computing systems, possibly including CGRAs varying in size, efficient dynamic compilation/mapping techniques are required. Dynamic mapping will be responsible for automatically moving computations originally running in the GPP to the CGRA. This paper presents our approach to dynamically map computations to CGRAs coupled to a GPP. Specifically, we evaluate the potential of the MegaBlock to accelerate the execution of a number of representative benchmarks when targeting an architecture based on a GPP and a CGRA. In addition, we show the impact on performance when using constant folding and propagation optimizations. © 2010 IEEE.

Abstract
The web is a comprehensive and dynamic repository of information regarding most of the areas of human knowledge. However, retrieving information from the web is not an easy task. Web's characteristics place many difficulties to users willing to explore it as an information source. Information retrieved from the web is usually very extensive, composed of voluminous collections of hypertext documents. Taking advantage of the intrinsic value present in this huge resource requires to organize relevant information according to specific needs. When organizing web resources to satisfy persistent information needs, some evaluation scheme is required to measure the system performance, as perceived by users. The resource quality might be continuously measured, allowing for automatic corrections if and when significant deviations are detected. This adaptive quality control framework may also detect and follow drift in user information needs. We propose to evaluate and control resources' global quality based on a three-dimensional space with dimensions representing Automation, Efficacy and Efficiency. Each dimension in this space aggregates a set of measures, relevant to the resource's global quality. The quality of the system is permanently monitored; the system periodically measures and stores the values of its quality parameters. This quality framework has been partially evaluated on two web resources.

Abstract
A natural movement towards artificial intelligence (AI) techniques took place in the last years in power system analysis. Many research works have used AI topics like search techniques, knowledge representation, reasoning and learning systems, as well as heuristic tools to address power system problems. This paper focuses the discussion on power system reliability evaluation and this natural transition from AI topics to a more sophisticated software design, known as intelligent agent (IA) technology. Instead of applying AI techniques to improve a single stage of the Monte Carlo Simulation (MCS), the IA architecture explores new ways to support AI topics. However, this natural movement needs to be managed through the proposal of a modern framework of power system tools, where several different techniques have to be combined in order to maximize each one's benefits and advantages. © 2010 IEEE.

Abstract
Translating legislation and regulations into access control systems in healthcare is, in practice, not a straightforward task. Excessive regulation can create barriers to appropriate patient treatment. The main objective of this paper is to present a new methodology that can define, from legislation to practice, an access control policy as well as a RBAC model, in order to comprise generic legislation and regulation issues together with the access control needs from the ends users of a healthcare information system. The methodology includes the use of document analysis as well as grounded theory and mixed methods research. This methodology can be easily applied within a healthcare practice or any other domain with similar requirements. It helps to bridge the gap between legislation and end users' needs, while integrating information security into the healthcare processes in a more meaningful way.