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Publications

2014

ESEIG Mobile: An M-Learning Approach in a Superior School

Authors
Queirós, R; Pinto, M;

Publication
Int. J. Knowl. Based Organ.

Abstract
In recent years, mobile learning has emerged as an educational approach to decrease the limitation of learning location and adapt the teaching-learning process to all type of students. However, the large number and variety of Web-enabled devices poses challenges for Web content creators who want to automatic get the delivery context and adapt the content to mobile devices. This paper studies several approaches to adapt the learning content to mobile phones. It presents an architecture for deliver uniform m-Learning content to students in a higher School. The system development is organized in two phases: firstly enabling the educational content to mobile devices and then adapting it to all the heterogeneous mobile platforms. With this approach, Web authors will not need to create specialized pages for each kind of device, since the content is automatically transformed to adapt to any mobile device capabilities from WAP to XHTML MP-compliant devices.

2014

Reassuring the elderly regarding the use of mobile devices for mobility

Authors
Cunha, A; Trigueiros, P; Lemos, T;

Publication
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abstract
People facing threats of mobility loss have their self-confidence shaken and tend to reduce their physical activity. As is well-known, the decreased physical activity, particularly for the elderly, is one of the factors that contribute to accelerating the deterioration of their health with consequent loss of autonomy and quality of life. Today, GPS-based technologies available on mobile devices offer many solutions to help guide users around much of the world. However, there are several known factors that act as barriers to the use of these technologies, such as user unfamiliarity with these devices, the complexity of geographical information and the difficulty of typing the origin and destination locations. In this paper we propose a solution for mobile devices that seeks to promote user confidence in daily mobility, especially among the elderly. We present the main system functionalities and the interface design. © 2014 Springer International Publishing.

2014

Comparison of Sampling Plans by Variables using the Bootstrap and Monte Carlo Simulations

Authors
Figueiredo, F; Figueiredo, A; Gomes, MI;

Publication
INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2014 (ICCMSE 2014)

Abstract
We consider two sampling plans by variables to inspect batches of products from an industrial process under a context of unknown distribution underlying the measurements of the quality characteristic under study. Through the use of the bootstrap methodology and Monte Carlo simulations we evaluate and compare the performance of those sampling plans in terms of probability of acceptance of lots and average outgoing quality level.

2014

Fluorescence Measurement: Principles and Techniques

Authors
da Silva Jorge, PA;

Publication
Handbook of Optical Sensors

Abstract
Traditionally, uorescence-based analytical methods were associated with high-cost bulky laboratory equipment. However, a diversity of technological advances taking place over the last 20 years concurred to change this picture. In the eld of optoelectronics, the advent of low-cost blue and UV lasers and LEDs, together with new miniature CCD spectrometers and high-sensitivity avalanche photodiodes (APDs), is enabling a new generation of spectroscopy tools to be developed and deployed in eld applications. On the other hand, chemistry and material sciences are delivering new types of uorescent materials with enhanced sensing properties, such as long-lived metallo-organic complexes or highly photostable quantum dots (QDs). Such developments are expanding the uses of uorescence and enabling new applications such as long-term multiwavelength imaging, ow cytometry analysis in microuidic chips, high-throughput DNA sequencing, and ber-optic-based diagnostic probes. © 2015 by Taylor and Francis Group, LLC.

2014

Open-end multi-level six-phase machine drive system with three three-phase DC-link converters

Authors
Maia, ACN; Jacobina, CB; Freitas, NB;

Publication
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

Abstract

2014

In vitro pilot study on bone heating during surgical implant bed preparation

Authors
Fangaia, S; Almeida, M; Carvalho, L; Nicolau, P;

Publication
BIODENTAL ENGINEERING II

Abstract
Introduction: The atraumatic preparation of the implant bed and the presence of healthy bone factors have been considered essential for osseointegration of an implant. Heat generation during bone drilling has been related with the pressure applied by the operator, characteristics of the drill bit, the drilling depth, the type of irrigation, the rotational speed of the drilling time and the density of the bone tissue. Although bone drilling practice has been performed under irrigation, recent studies in the literature propose the use of a clinical protocol without irrigation. The primary objective of this study was to use an optical fibber Bragg grating sensor to measure thermal variations during implant bed preparation using surgical drills with a new surface coating. Materials and Methods: A literature review was performed and a pilot study designed using a fresh pig's jaw at room temperature, and three drilling groups were performed: Group I - Straumann (R) Drill without irrigation Group II - Straumann (R) Drill coated Titanium Nitride and Aluminum (NiTiAl) without irrigation. Group III (Control) - Straumann (R)) Drill with irrigation. The perforations were made sequentially, using drills of 2.2, 2.8 and 3.5 mm, to a depth of 10 mm, at a speed of 800 rpmand 0.2 mm/s under a constant force of 4N. Changes in temperature were recorded using an optical fibber Bragg grating sensor, placed in an intra-osseous location. Results: Implant bed preparation procedure produced a temperature rise of: 0.39 degrees C to 0.53 degrees C, 1.28 degrees C to 2.70 degrees C, and 1.57 degrees C to 4.39 degrees C in group I, II and III respectively. The drills coated with NiTiAl and without irrigation have a lower temperature increase when compared with the uncoated drills, maintaining the procedure without irrigation. Discussion and Conclusions: The optical fibber Bragg gratings sensors have the ability to register changes in temperature that occur during the preparation of the implant bed. The coating of surgical drills with NiTiAl caused a minor increase of temperature in comparison with drills without coating. Perforations without irrigation performed at a speed of 800 rpm with a force of 4N do not seem to significantly increase the temperature in bone.

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