Browsing by Issue Date, starting with "2009-10"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
- Business intelligence in higher education: Managing the relationships with studentsPublication . Piedade, Maria Beatriz Guerra da; Santos, Maribel YasminaThe closely monitoring of the students' academic activities, the evaluation of their academic success and the approximation to their day-by-day academic activities are key factors in the promotion of the student's academic success in higher education institutions. To be possible the implementation of monitoring processes and activities, it is essential the acquisition of knowledge about the students and their academic behaviour. This knowledge supports the decision-making associated with teaching-learning process, enhancing an effective institution-student relationship. This paper presents a Student Relationship Management (SRM) system that is under development. The SRM system supports the SRM concept and practice and has been implemented using concepts and technologies associated to the Business Intelligence systems. To demonstrate the SRM system relevance in the process of acquisition of knowledge about the students and in the support of actions and decisions based on such knowledge, an application case carried out in a real context is also presented.
- Solving the non-split weighted ring arc-loading problem in a resilient packet ring using particle swarm optimizationPublication . Bernardino, Anabela; Bernardino, Eugénia; Sánchez-Pérez, Juan Manuel; Gómez-Pulido, Juan Antonio; Vega-Rodríguez, Miguel AngelMassive growth of the Internet traffic in last decades has motivated the design of high-speed optical networks. Resilient Packet Ring (RPR), also known as IEEE 802.17, is a standard designed for the optimized transport of data traffic over optical fiber ring networks. Its design is to provide the resilience found in SONET/SDH networks but instead of setting up circuit oriented connections, providing a packet based transmission. This is to increase the efficiency of Ethernet and IP services. In this paper, a weighted ring arc-loading problem (WRALP) is considered which arises in engineering and planning of the RPR systems (combinatorial optimization NP- complete problem). Specifically, for a given set of non-split and uni-directional point-to-point demands (weights), the objective is to find the routing for each demand (i.e., assignment of the demand to either clockwise or counter-clockwise ring) so that the maximum arc load is minimized. This paper suggests four variants of Particle Swarm Optimization (PSO), combined with a Local Search (LS) method to efficient non-split traffic loading on the RPR. Numerical simulation results show the effectiveness and efficiency of the proposed methods.
- A hybrid ant colony optimization algorithm for solving the terminal assignment problemPublication . Bernardino, Eugénia; Bernardino, Anabela; Sánchez-Pérez, Juan Manuel; Gómez-Pulido, Juan Antonio; Vega-Rodríguez, Miguel AngelThe past two decades have witnessed tremendous research activities in optimization methods for communication networks. One important problem in communication networks is the Terminal Assignment Problem. This problem involves determining minimum cost links to form a network by connecting a collection of terminals to a collection of concentrators. In this paper, we propose a Hybrid Ant Colony Optimization Algorithm to solve the Terminal Assignment Problem. We compare our results with the results obtained by the standard Genetic Algorithm, the Tabu Search Algorithm and the Hybrid Differential Evolution Algorithm, used in literature.
- Solving the weighted ring edge-loading problem without demand splitting using a Hybrid Differential Evolution AlgorithmPublication . Bernardino, Anabela; Bernardino, Eugénia; Sanchez-Perez, Juan Manuel; Gomez-Pulido, Juan Antonio; Vega-Rodriguez, Miguel AngelIn the last few years we have seen a significant growth in Synchronous Optical Network (SONET) deployments in telecommunication service providers. With growth of data traffic, network operators seek network-engineering tools to extract the maximum benefits out of the existing infrastructure. This has suggested a number of new optimization problems, most of them in the field of combinatorial optimization. We address here the Weighted Ring Edge-Loading Problem (WRELP). The WRELP is an important optimization problem arising in a popular ring topology for communication networks - given a set of nodes connected along a bi-directional SONET ring, the objective is to minimize the maximum load on the edges (pairwise) of a ring. Our procedure includes some original features, including the application of Hybrid Differential Evolution. We also perform comparisons with standard Differential Evolution, Genetic Algorithm and Tabu Search.
- A primal-dual simplex algorithm for bi-objective network flow problemsPublication . Eusébio, Augusto; José Rui Figueira; Matthias EhrgottIn this paper we develop a primal–dual simplex algorithm for the bi-objective linear minimum cost network flow problem. This algorithm improves the general primal–dual simplex algorithm for multi-objective linear programs by Ehrgott et al. (J Optim Theory Appl 134:483–497, 2007). We illustrate the algorithm with an example and provide numerical results.