Abstract

Abstract
Encontrar pessoas com interesses semelhantes dentro de um domínio pode fornecer um importante auxílio na gestão de centros de investigação. Como a produção académica é facilmente obtida em bases de dados bibliográficas e académicas, estas podem ser usadas para descobrir as afinidades entre os investigadores que não estejam já evidenciadas pela co-autoria. Este processo de descoberta dá-se com a ajuda de técnicas de análise de texto, na base dos termos utilizados nos respectivos documentos. A afinidade pode ser representada em forma de rede, em que os nós representam os artigos de cada investigador e as ligações representam similaridade entre os diferentes investigadores. Cada nó pode ser caracterizado através de diversas medidas de centralidade na rede e algoritmos de detecção de comunidades permitem identificar grupos com interesses semelhantes. Cada nó é ainda caracterizado por um conjunto de palavras-chave e resumos descobertos automaticamente com a ajuda de técnicas avançadas. Este artigo fornece mais detalhes sobre os métodos adoptados e/ou desenvolvidos, alguns dos quais foram implementados no nosso protótipo. Os métodos descritos são gerais e aplicáveis a muitos domínios diferentes, incluindo documentos que descrevem projetos de I&D, documentos associados a legislação, processos judiciais ou procedimentos médicos. Acreditamos deste modo que este trabalho pode ser útil para um público relativamente amplo.

Abstract
During the recent sovereign debt crisis, the European Banking Authority conducted two stress tests on European banks in order to gauge their capital needs, core Tier-1 ratios and ratios of resilience to adverse shocks. We assess the informational content of the disclosure of the stress test outcomes. We conclude that the stress tests conveyed new information and that the outcomes were not anticipated by the stock market but were partially anticipated by the credit default swap (CDS) market. However, while the stock market reacted to the disclosure of the stress test outcomes, in the CDS market there is some evidence of a 'reverse' reaction. Moreover, the publication of the outcomes of the stress tests had a stronger impact on the stock prices of riskier financial institutions. A similar pattern is evident in the CDS market, albeit narrowed to one of the stress tests and amid the financial institutions with higher perceived credit risk.

Abstract
Uncoordinated Frequency Hopping (UFH) has been proposed as a mechanism to address denial-of-service attacks, and consists of legitimate devices hopping uniformly at random between frequencies to cope with an attacker that aims to disrupt communication. We consider the use of UFH against an eavesdropper adversary that aims to overhear as much information as possible. We characterize the secrecy level of wireless networks under UFH, showing the harmful security effect of broadband eavesdropper adversaries capable of overhearing in multiple frequencies. To counter such eavesdroppers, we consider the use of broadband friendly jammers that are available to cause interference on eavesdroppers. Our results show that adding a limited number of broadband friendly jammers effectively improves the security level of such systems.

Abstract
This paper presents a control technique for enhancing the stable operation of distributed generation (DG) units during islanding and grid-connected modes. The compensation of instantaneous variations in the reference current components of DG units in ac-side, and dc-link voltage variations in dc-side of interfaced converters, are considered properly in the control loop of DG units, which is the main contribution and novelty of this control technique over other control techniques. By using the proposed control technique, DG units can provide the continuous injection of active power from DG sources to the local loads and/or utility grid. Moreover, by setting appropriate reference current components in the control loop of DG units, reactive power and harmonic current components of loads can be supplied with a fast dynamic response. The performance of the developed control is assessed through simulation results during dynamic and steady-state operating conditions.

Abstract
Following the successful results obtained in the previous editions of the TEEM Conference, a new edition of this event was held at ISEP/IPP - School of Engineering, Polytechnic Institute of Porto -, on October 7-9, 2015. The TEEM Conference was organized in thematic tracks, being one of them devoted to the topic of "Robotics in Education". This topic tries to strengthen different skills for future engineers/scientists by the means of the design, construction and programming of robots. These skills are related to various fields like science, technology, engineering and mathematics (STEM). Also, and equally important, the introduction of the robot in the classroom, both at school and college and even as extracurricular activity, promotes a host of outcomes such as technological fluency, creativity, participation, support, collaboration and cooperation. The purpose of the track "A Robot in the Classroom" was to bring together researchers, teachers and practitioners interested in the Robotics in Education. This track emphasized the exchange of experiences, methodologies and materials to motivate students about science and technology.