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Publicações

Publicações por SYSTEM

2015

Boosting Learning: Non-intrusive Monitoring of Student's Efficiency

Autores
Goncalves, S; Rodrigues, M; Carneiro, D; Fdez Riverola, F; Novais, P;

Publicação
METHODOLOGIES AND INTELLIGENT SYSTEMS FOR TECHNOLOGY ENHANCED LEARNING

Abstract
Keeping students interested and motivated is perhaps one of the most difficult and traditional tasks assigned to teachers. With technology being engaged increasingly into learning activities, with its advantages and disadvantages, some new aspects need to be considered. Undoubtedly, technology acts as an enhancer for learning, opening new paths for teaching. However there are some drawbacks too. Keeping students in the right track, doing what they are expected to do, with commitment and motivation, becomes an enormous challenge when an amazing digital world full of all kind of temptations is at the distance of their personal smartphones or even in the computer they use to study. This excess of stimuli and the process of switching and choosing between them has as potential effects on attention, stress and mental fatigue. Stressed or fatigued students fail to deliver the required performance for the task they are engaged in. This paper presents a non-intrusive approach for monitoring student's performance in real time and measure the effect of these external variables on students. The long-term goal is to empower teachers with valuable information about the students' state, allowing them to better manage their students and teaching methodologies.

2015

A framework for monitoring and assisting seniors with memory disabilities

Autores
Novais, P; Carneiro, D; Costa, Â; Costa, R;

Publicação
Ambient Assisted Living

Abstract
Population aging brings increased social problems. Solutions for this new reality must be devised. Providing care services at home may benefit patients, health service providers, and social security systems and needs to be seen as a possible solution for those social problems. By maintaining the patient at home, in his or her own environment, care services costs can be diminished and, at the same time, the comfort and well-being of the person in need are significantly increased. To pursue this goal, we explore the advantages that ambient assisted living can bring to people in a home environment, focusing on the problems of health care services at home. Specifically, in this chapter, we present a framework focused on the monitoring and assistance of the elderly that are living alone, focusing on those elderly with memory disabilities. We believe that this approach will enable the challenges that the current trend of population aging poses to be tackled. © 2015 by Taylor & Francis Group, LLC.

2015

Demand Modelling for Responsive Transport Systems Using Digital Footprints

Autores
Silva, P; Antunes, F; Gomes, R; Bento, C;

Publicação
PROGRESS IN ARTIFICIAL INTELLIGENCE

Abstract
Traditionally, travel demand modelling focused on long-term multiple socio-economic scenarios and land-use configurations to estimate the required transport supply. However, the limited number of transportation requests in demand-responsive flexible transport systems require a higher resolution zoning. This work analyses users short-term destination choice patterns, with a careful analysis of the available data coming from various different sources, such as GPS traces and social networks. We use a Multinomial Logit Model, with a social component for utility and characteristics, both derived from Social Network Analyses. The results from the model show meaningful relationships between distance and attractiveness for all the different alternatives, with the variable distance being the most significant.

2015

Trimming of 3D solid finite element meshes: sheet metal forming tests and applications

Autores
Barros, PD; Baptista, AJ; Alves, JL; Oliveira, MC; Rodrigues, DM; Menezes, LF;

Publicação
ENGINEERING WITH COMPUTERS

Abstract
Over the last years, the numerical simulation of integrated processes has become the major challenge in virtual try-out of sheet metal components, including trimming operations that may occur between forming steps. Detailed simulation of trimming processes is a challenging task, particularly when integrated with other forming operations such as deep drawing or hemming. A simplified approach can be adopted in which elements outside the trim surface are deleted from the finite element (FE) model adjusting the remaining to the surface. Following this approach, the state variables are mapped from the old FE mesh to the new trimmed mesh to continue the simulation. This paper addresses this simplified approach to the trimming process exploring a previously presented algorithm (Finite Elem Anal Des 42: 1053-1060, Baptista et al. 2006), which allows the treatment of hexahedral finite element meshes. Particularly, it focuses on the performance evaluation of the implemented strategies for correcting the FE mesh to the trimming surface, including the treatment of pentahedral-shaped elements. Different correction and treatment strategies are evaluated on different types of meshes, based on numerical simulation results of simple mechanical tests: uniaxial tensile test and simple bending test. Finally, two practical applications are given where the local effect of the trimming algorithm is highlighted.

2015

A new mathematical model for the cutting stock/leftover problem

Autores
Arenales M.N.; Cherri A.C.; Do Nascimento D.N.; Vianna A.;

Publicação
Pesquisa Operacional

Abstract
This paper addresses the cutting stock/leftover problem (CSLP), which differs from the ordinary cutting stock problem (CSP) by retaining stock leftovers that can be cut in the future to meet new demands. Therefore, leftovers are not considered waste in the current period. A new mathematical model for the CSLP is presented to capture a well-used strategy in the practice of cutting, which consists of partially cutting the objects in stock, and keeping the leftovers to be cut in the next periods. Computational experiments were made for the one-dimensional case, although other dimensions can be considered straightforward.

2014

Investigação operacional em ação: casos de aplicação

Autores
Oliveira, RC; Ferreira, JS;

Publicação

Abstract

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