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Background High epilepsy prevalence and incidence have been reported in areas with high onchocerciasis transmission. Recent findings suggest that proper community-directed treatment with ivermectin (CDTI) is potentially able to prevent onchocerciasis-associated epilepsy (OAE). We assessed the epilepsy prevalence and onchocerciasis transmission in two Nigerian villages following more than 20 years...
This paper presents a novel multi-agent architecture for meeting scheduling. The proposed architecture is a new Hybrid Multi-Agent Architecture (HMAA) that generates new heuristics for solving NP-hard problems. Moreover, the paper investigates the feasibility of running computationally intensive algorithms on multi-agent architectures while preserving the ability of small agents to run on small devices,...
Ad hoc wireless networking is a new approach to wireless communication with potential applications in very unpredictable and dynamic environments. Many applications today, especially in military and emergency situations, are based upon ad hoc wireless networks. The security requirements of these networks are harder to enforce than in a traditional network. Securing the routing in ad hoc wireless networks...
Ad hoc wireless networking is a new approach for wireless communication with its potential applications in very unpredictable and dynamic environments. These networks have no infrastructures for achieving end-to-end routing of packets in the network. The nodes communicate between each other without the intervention of centralized administration, thus each node acts both as a router and as a host....
Ad hoc wireless networks consist of a number of nodes roaming freely, interconnecting wirelessly without relying on a predefined infrastructure. These nodes have the property of mobility which enables them to join and leave the network as required. This makes ad hoc wireless networks suitable for hostile environments, where security is a major concern. Achieving security in ad hoc networks is challenging...
Ad hoc wireless networking is a new approach for wireless communication with its potential applications in very unpredictable and dynamic environments. These networks have no infrastructures for achieving end-to-end routing of packets in the network. The Nodes communicate between each other without the intervention of centralized administration, thus each node acts both as a router and as a host....
Ad hoc wireless networks consist of a number of nodes roaming freely, interconnecting with each other by wireless connection without relying on a predefined infrastructure. When comparing ad hoc wireless networks with fixed networks or infrastructure wireless networks, ad hoc wireless networks base on the nodes that work as host and as router. In this paper, we present a new routing protocol for an...
Today, databases provide the best technique for storing and retrieving data, but they suffer from the absence of a semantic perspective, which is needed to reach global goals such as the semantic web and data integration. Using ontologies will solve this problem by enriching databases semantically. Since building an ontology from scratch is a very complicated task, we propose an automatic transformation...
We present a process calculus, CCA, for the modelling and verification of mobile systems that are context-aware. This process calculus is built upon the calculus of mobile ambients and introduces new constructs to enable ambients and processes to be aware of the environment in which they are being executed. This results in a powerful calculus where mobility and context-awareness are first-class citizens...
This paper presents a case study of an image retrieval system based on a notion of similarity between images in a multimedia database and where a user request can be an image file or a keyword. The CBIR (content based image retrieval) system, the current system of search for information (SSI) -e.g. PEIR, MIRC, MIR, IRMA, and Pathopic- and the current search engines (CSE) -e.g. Google, Yahoo and Alta...
Policy-based approaches to the management of systems distinguish between the specification of requirements, in the form of policies, and their enforcement on the system. In this work we focus on the latter aspect and investigate the enforcement of stateful policies in a concurrent environment. As a representative of stateful policies we use the UCON model and show how dependencies between policy rules...
Policies provide a flexible and scalable approach to the management of distributed systems by separating the specification of security requirements and their enforcement Over the years the expressiveness of policy languages increased considerably making it possible to capture a variety of complex requirements that for example depend on the history of the system execution. The most important criteria...
Policies are increasingly used to govern the behaviour of complex distributed systems. Most policy models that allow policy composition, to address the complexity of policies, are only concerned with structural composition. In this paper we argue that it is natural to compose policies also along the temporal axis, i.e. express policies that can dynamically change over time or on the occurrence of...
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