Abstract This paper investigates the performance of the genetic algorithm and tabu search in solving the optimization problem of base station location. Optimization refers to maximizing radio coverage while minimizing equipment and maintenance costs. A comparative analysis of both the genetic algorithm and tabu search was undertaken. The effects of changing the population size as well as the type of selection... This paper investigates the performance of the genetic algorithm and tabu search in solving the optimization problem of base station location. Optimization refers to maximizing radio coverage while minimizing equipment and maintenance costs. A comparative analysis of both the genetic algorithm and tabu search was undertaken. The effects of changing the population size as well as the type of selection were investigated for the genetic algorithm while the size of the candidate list and tabu tenure were examined for the tabu search. It was determined that the genetic algorithm performed best when tournament selection was employed with a population size of 10. A tabu tenure set to 1 and a candidate list size of 10 engendered the most optimal performance of the tabu list. Utilization of each algorithm’s most optimal parameters allowed us to effectively compare the performances of the genetic algorithm with those of the tabu search. Read More Read Less

Abstract With the growing popularity of outdoor locating devices it is both technically and economically feasible for a mobile device to know its physical location. In location-based protocols for multihop wireless networks, routing packets and selecting the correct interface and next hop for a packet being forwarded relies on geographical information of nodes. This requires availability of one static server or... With the growing popularity of outdoor locating devices it is both technically and economically feasible for a mobile device to know its physical location. In location-based protocols for multihop wireless networks, routing packets and selecting the correct interface and next hop for a packet being forwarded relies on geographical information of nodes. This requires availability of one static server or number of mobile servers distributed over the network area to provide the destination location. These types of servers suffer from different type of failures due to mobility and single point of failure, which leads to the whole network to go down and heavy load at a single server. In addition, the periods of time spent on looking for a server, and the length of path from a node in the network to the server are other problems. The main objective of this paper is to present a mechanism that overcomes these failures and problems. Results have shown that the proposed mechanism is scalable with the number of nodes, speed and mobility, as well as reducing the time spent on looking for the server, and reducing the path length from a requester node to the server node. Read More Read Less

Abstract This paper provides an overview regarding the application of an ontology-driven requirements engineering methodology, namely OntoREM, in the aerospace industry with the objective to assess the extent to which this approach has the potential to develop better quality requirements in less time and at less cost compared to traditional requirements engineering processes, taking the Airbus wing-engineering requirements as the case... This paper provides an overview regarding the application of an ontology-driven requirements engineering methodology, namely OntoREM, in the aerospace industry with the objective to assess the extent to which this approach has the potential to develop better quality requirements in less time and at less cost compared to traditional requirements engineering processes, taking the Airbus wing-engineering requirements as the case study. The OntoREM’s Metamodel is briefly introduced, which embodies both the key process and task ontologies that guide the OntoREM related requirements engineering activities along with the supporting tooling environments, both existing and newly developed ones. Finally, the paper provides an overview of a small number of focused case studies in the aerospace context that have already been conducted and will help to further evolve and critically evaluate OntoREM with the objective to investigate the potential of a more knowledge-driven as opposed to process-driven approach to RE. Read More Read Less

Abstract Use of Petri nets to verify the reach-ability and soundness of a cooperative workflow model is presented in this paper. First, we outline a cooperative workflow model, which is a modified version of Bonita workflow model. Bonita is open source cooperative workflow management software which is an ongoing project from object web consortium. Then we describe the cooperative workflow model... Use of Petri nets to verify the reach-ability and soundness of a cooperative workflow model is presented in this paper. First, we outline a cooperative workflow model, which is a modified version of Bonita workflow model. Bonita is open source cooperative workflow management software which is an ongoing project from object web consortium. Then we describe the cooperative workflow model using a special kind of Petri net called Wf-net. Next we employ WF-net for verification of the model for reachability and soundness properties. The Petri net based verification shows that the model is reachable and sound. Read More Read Less

Abstract In the recent period web resources gain momentum in terms of extensive refined processing resulting the inclusion of a very large number of pages retrieval for any given query. Building taxonomy of the source becomes essential in order to deal with the process of related divisions and terms. The web world has many systems and architectures for processing content-based or... In the recent period web resources gain momentum in terms of extensive refined processing resulting the inclusion of a very large number of pages retrieval for any given query. Building taxonomy of the source becomes essential in order to deal with the process of related divisions and terms. The web world has many systems and architectures for processing content-based or context-based features of Source. In this paper we analyze these developments and attempt to generate a set of features to improve web page taxonomy of selected source by classifying web pages as main and fractals. We did a series of testing using an extensive datasets of Source by deploying both using content-based and context-based web page features. Our testing and implementation ensure a high level success in the combination of web content analysis. Read More Read Less

Abstract As we enter the third millennium, we are experiencing one of the most important changes to our daily lives, the move to an internet-based society. Internet has grown like a plant, and many welcome it as a tool for productivity and enlightenment. As a result, much has changed at home, school, work and even leisure activities. Some changes are already... As we enter the third millennium, we are experiencing one of the most important changes to our daily lives, the move to an internet-based society. Internet has grown like a plant, and many welcome it as a tool for productivity and enlightenment. As a result, much has changed at home, school, work and even leisure activities. Some changes are already here and are spreading around the globe, others are just beginning. One of the significant changes is how developing countries are going to conduct their business and how can they harvest the benefits of internet trading. This paper presents a qualitative study that can provide the authorities, business owners, researchers as well as the readers with an overview of the current Electronic Commerce status in Saudi Arabia and the major factors that obstacle its growth and development. It is hoped that this study will narrow the gap of knowledge and furnished useful guidelines that could unleash e-commerce maturity in Saudi Arabia and developing countries as well. Read More Read Less