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Publicações

2018

Smes’ internationalization in the American continent: A literature review [Internationalisation des pme sur le continent Américain: Revue de la littérature] [Internacionalização de pme no continente Americano: Revisão da literatura] [Internacionalización de pymes en el continente Americano: Revisión de la literatura]

Autores
Ribau, CP; Moreira, AC; Raposo, M;

Publicação
Innovar

Abstract
Considering the pressing interest of the academic community and the business world over the internationalization of Small and Medium-sized Enterprises (smes), this research is aimed to review the empirical literature about smes’ internationalization processes in the American continent, according to information included in the main academic databases. This study makes an in-depth analysis of 39 papers (out of a group of 329) published between 1999 and 2014, contributing to the construction of knowledge and the understanding of research in this field. This work allowed identifying patterns and trends, as well as concluding that smes’ internationalization research is USA-and-Canada-centered and is largely influenced by four main topics: internationalization theories, strategy, performance and international perspectives. According to the results, it is also concluded that research studies have mainly followed a quantitative approach. Conclusions and interpretations of opportunities for future research are important for both the academic community and the business world.

2018

Gemini Infrared Multi-Object Spectrograph: Instrument Overview

Autores
Sivanandam, S; Chapman, S; Simard, L; Hickson, P; Venn, K; Thibault, S; Sawicki, M; Muzzin, A; Erickson, D; Abraham, R; Akiyama, M; Andersen, D; Bradley, C; Carlberg, R; Chen, SJ; Correia, C; Davidge, T; Ellison, S; El Sankary, K; Fahlman, G; Lamb, M; Lardière, O; Lemoine Busserolle, M; Moon, DS; Murray, N; Peck, A; Shafai, C; Sivo, G; Veran, JP; Yee, H;

Publicação
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII

Abstract
The Gemini Infrared Multi-Object Spectrograph (GIRMOS) is a powerful new instrument being built to facility- class standards for the Gemini telescope. It takes advantage of the latest developments in adaptive optics and integral field spectrographs. GIRMOS will carry out simultaneous high-angular-resolution, spatially-resolved infrared (1 - 2.4 µm) spectroscopy of four objects within a two-arcminute field-of-regard by taking advantage of multi-object adaptive optics. This capability does not currently exist anywhere in the world and therefore offers significant scientific gains over a very broad range of topics in astronomical research. For example, current programs for high redshift galaxies are pushing the limits of what is possible with infrared spectroscopy at 8 -10- meter class facilities by requiring up to several nights of observing time per target. Therefore, the observation of multiple objects simultaneously with adaptive optics is absolutely necessary to make effective use of telescope time and obtain statistically significant samples for high redshift science. With an expected commissioning date of 2023, GIRMOS's capabilities will also make it a key followup instrument for the James Webb Space Telescope when it is launched in 2021, as well as a true scientific and technical pathfinder for future Thirty Meter Telescope (TMT) multi-object spectroscopic instrumentation. In this paper, we will present an overview of this instrument's capabilities and overall architecture. We also highlight how this instrument lays the ground work for a future TMT early-light instrument.

2018

Design Science Research: an Emerging Methodology for Service Design

Autores
Jorge Teixeira; Lia Patrício; Tuure Tuunanen;

Publicação

Abstract

2018

Asura: A Game-Based Assessment Environment for Mooshak (Short Paper)

Autores
Paiva, JC; Leal, JP;

Publicação
SLATE

Abstract
Learning to program is hard. Students need to remain motivated to keep practicing and to overcome their difficulties. Several approaches have been proposed to foster students’ motivation. As most people enjoy playing games of some kind and play on a regular basis, the use of games is one of the most widely spread approaches. However, taking full advantage of games to teach specific concepts of programming requires much effort. This paper presents Asura, a game-based assessment environment built on top of Mooshak that challenges students to code Software Agents (SAs) to play a game, allowing them to test the SAs against each others’ SAs and watch a movie of the test. Once the challenge development stage ends, teachers are able to organize game-like tournaments among SAs. One of the key features of Asura is that it provides a means to reduce the required effort of building game-based challenges up to that of creating traditional programming exercises.

2018

An Advanced Battery Model for WSN Simulation in Environments With Temperature Variations

Autores
Rodrigues, L; Leao, E; Montez, C; Moraes, R; Portugal, P; Vasques, F;

Publicação
IEEE SENSORS JOURNAL

Abstract
Wireless sensor networks (WSNs) can be used to support monitoring activities in a wide range of applications and communication environments. Its usage in extreme conditions, in what concerns pressure, temperature, and humidity, must be carefully assessed before the network deployment. In particular, the temperature variations have a direct impact upon the behavior of WSNs through the batteries of sensor nodes. These electrochemical devices are highly susceptible to temperature variations, which modifies the offered effective charge capacity. In this context, it is difficult to estimate the behavior of batteries over time, impairing the extraction of relevant information for energy-aware approaches. Such information, particularly battery state of charge, voltage, and lifetime, is often used by WSN simulators to predict the communication behavior in different scenarios. Nevertheless, WSN simulators generally use simplistic battery models, causing significant deviations in simulation results when compared with actualWSN deployments. This paper describes the implementation of the Temperature-Dependent Kinetic Battery Model (T-KiBaM) in the Castalia simulator, which enables a considerable improvement of the accuracy of simulations in communication environments with different temperature conditions. An experimental assessment has been performed with temperature variations over time to validate the usage of the T-KiBaM battery model. The experimental results indicate that the T-KiBaM model is quite accurate when estimating battery behavior under both different temperature set points and different temperature variations.

2018

Design and Evaluation of a Low Power CGRA Accelerator for Biomedical Signal Processing

Autores
Avelar, HH; Ferreira, JC;

Publicação
DSD

Abstract
This work presents the design and analysis of a biological signal processing accelerator, including an interface controller and memory subsystem for a low-power CGRA. The controller design supports several operation modes, which can perform several applications when paired with the CGRA reconfiguration capabilities. Physical synthesis shows that the controller introduces only a 6 percent area and power overhead compared to the CGRA core, while allowing independent processing of inner loops at high frequencies and the exploitation of pipelining and parallelism. In-depth power analysis based on layout information was performed, including an evaluation of the use of power gating techniques. A practical case study (ECG signal processing) was also evaluated.

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