Genetic Algorithm-based Mapper to Support Multiple Concurrent Users on Wireless Testbeds

Communication and networking research introduces new protocols and standards with an increasing number of researchers relying on real experiments rather than simulations to evaluate the performance of their new protocols. A number of testbeds are currently available for this purpose and a growing number of users are requesting access to those testbeds. This motivates the need for better utilization of the testbeds by allowing concurrent experimentations. In this work, we introduce a novel mapping algorithm that aims to maximize wireless testbed utilization using frequency slicing of the spectrum resources. The mapper employs genetic algorithm to find the best combination of requests that can be served concurrently, after getting all possible mappings of each request via an induced sub-graph isomorphism stage. The proposed mapper is tested on grid testbeds and randomly generated topologies. The solution of our mapper is compared to the optimal one, obtained through a brute-force search, and was able to serve the same number of requests in 82.96% of testing scenarios. Furthermore, we show the effect of the careful design of testbed topology on enhancing the testbed utilization by applying our mapper on a carefully positioned 8-nodes testbed. In addition, our proposed approach for testbed slicing and requests mapping has shown an improved performance in terms of total served requests, about five folds, compared to the simple allocation policy with no slicing.Comment: IEEE Wireless Communications and Networking Conference (WCNC) 201

Library Economic Metrics: Examples of the Comparison of Electronic and Print Journal Collections and Collection Services

published or submitted for publicatio

JXTA-Overlay: a P2P platform for distributed, collaborative, and ubiquitous computing

With the fast growth of the Internet infrastructure and the use of large-scale complex applications in industries, transport, logistics, government, health, and businesses, there is an increasing need to design and deploy multifeatured networking applications. Important features of such applications include the capability to be self-organized, be decentralized, integrate different types of resources (personal computers, laptops, and mobile and sensor devices), and provide global, transparent, and secure access to resources. Moreover, such applications should support not only traditional forms of reliable distributing computing and optimization of resources but also various forms of collaborative activities, such as business, online learning, and social networks in an intelligent and secure environment. In this paper, we present the Juxtapose (JXTA)-Overlay, which is a JXTA-based peer-to-peer (P2P) platform designed with the aim to leverage capabilities of Java, JXTA, and P2P technologies to support distributed and collaborative systems. The platform can be used not only for efficient and reliable distributed computing but also for collaborative activities and ubiquitous computing by integrating in the platform end devices. The design of a user interface as well as security issues are also tackled. We evaluate the proposed system by experimental study and show its usefulness for massive processing computations and e-learning applications.Peer ReviewedPostprint (author's final draft

Optimising information literacy delivery to large classes: the contact or the online approach?

DCU Business School runs undergraduate programmes of varying sizes, from 40 to 200 students. Some modules cross disciplines and attract even higher numbers. One such module is HR118: Skills for success which in the last year has exceeded 200. Even this number is restrained by the optional nature of the module. Were it to be an obligatory module, the total would exceed 300. The Library has been providing embedded information literacy sessions to HR118 since its inception, providing face-to-face training on essential resources and research techniques, together with assessment. Generally the experience has been successful. There have been some problems, mainly organisational and logistical, but the Library and module co-ordinator have resolved these as they arise. However, the recent class size increase, and the possibility that the module may sometime become obligatory, forced the Library to devise an alternative strategy for 2008-09 – a hybrid approach which has enabled the Library to combine new technological options with traditional face-to-face engagement. There are many elements to the new programme, all designed to inform students on content, test the process and obtain feedback. This paper will assess the progress of Library input into the module. It will consider the key nature of relationships with academics, how organisation of the Library content element has been managed over time, and evaluate student response based on diverse evidence derived from online assessment, class feedback and survey. It will examine how developments to date feed into communication with faculty and into future improvements in information literacy development. Finally, the paper will address how Library input has advanced the delivery of information literacy to business undergraduates as a whole, and consider whether libraries should actually invest more in online delivery of information literacy or keep the focus on face-to-face delivery to groups

Automated system for the creation and replenishment of users' electronic lexicographical resources

This article proposes a solution to improve the efficiency of automated generation of electronic lexicographical resources based on strongly-structured electronic information arrays processing. The developed automated information system for lexicographical resources creation and replenishment have been described is this article. Several supporting subsystems of developed automated system have been characterized. The effectiveness of the information system has been evaluated

Music: A guide to finding information

A Library guide to finding print and electronic resources relevant to Musi

Cloud engineering is search based software engineering too

Many of the problems posed by the migration of computation to cloud platforms can be formulated and solved using techniques associated with Search Based Software Engineering (SBSE). Much of cloud software engineering involves problems of optimisation: performance, allocation, assignment and the dynamic balancing of resources to achieve pragmatic trade-offs between many competing technical and business objectives. SBSE is concerned with the application of computational search and optimisation to solve precisely these kinds of software engineering challenges. Interest in both cloud computing and SBSE has grown rapidly in the past five years, yet there has been little work on SBSE as a means of addressing cloud computing challenges. Like many computationally demanding activities, SBSE has the potential to benefit from the cloud; ‘SBSE in the cloud’. However, this paper focuses, instead, of the ways in which SBSE can benefit cloud computing. It thus develops the theme of ‘SBSE for the cloud’, formulating cloud computing challenges in ways that can be addressed using SBSE