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Publications

2016

Portfolio Optimization for Electricity Market Participation with NPSO-LRS

Authors
Faia, R; Pinto, T; Vale, ZA;

Publication
27th International Workshop on Database and Expert Systems Applications, DEXA 2016 Workshops, Porto, Portugal, September 5-8, 2016

Abstract

2016

Residual current method of grounding resistance measurement in transmissions towers with earth wire - Part 1: Study of residual current in transmition towers

Authors
Salamanca, HLL; Block, PAB; Retorta, F; Dahlke, DB; Gamboa, LRA; Bee, RT; Aquino, TF;

Publication
2016 IEEE/PES Transmission and Distribution Conference and Exposition (T&D)

Abstract

2016

Searching for Opportunities and Trust in International Markets

Authors
Carvalheira, AMB; Moreira, A;

Publication
Advances in Electronic Government, Digital Divide, and Regional Development - Handbook of Research on Entrepreneurial Success and its Impact on Regional Development

Abstract
Internationalization has been adopted by many companies, regardless of size, to boost their growth. Although the Uppsala model and the network approach have been extensively used to analyze how small firms internationalize their operations, this chapter addresses how a small firm of the clean carpentry industry managed to overcome an economic slowdown of its domestic market and boosted its growth. This chapter uses a case study approach that is framed on a literature review covering internationalization of SMEs, entrepreneurship, the importance of the network approach, the search of opportunities and trust, and relationship orientation to show how a firm abandoned its passive behavior and its focus on the domestic market to proactively address the international market following an entrepreneurial perspective.

2016

Intelligent System for Soccer Referee's Position Analysis

Authors
Rego, CM; Reis, LP; Meneses, F; Faria, BM;

Publication
NEW ADVANCES IN INFORMATION SYSTEMS AND TECHNOLOGIES, VOL 1

Abstract
The role of referees and the decisions they take have, in many cases, a decisive and direct influence on the course of a game. Unfortunately these decisions are not always correct. In a large amount of times, the mistakes are due to referee's bad positioning on the field. So it is fundamental to develop a model that may determine the correct position for a soccer referee. For this research work, data with all the game participants' positions in the field during the match has been used as its basis. The data included, players, ball and referees positions gathered by an automatic system. Referees with large experience in international competitions were used to obtain correct position knowledge. The achieved results, using a data mining approach, are very positive, both for predicting the assistant referee position, regardless of the team he is accompanying or the match with 77% of success, as to predict the referee position with 82% of success, in controlled game situations. In short, despite the limitations, the models are conclusive and can efficiently estimate the correct positioning of the referee in a soccer match.

2016

A survey on game backend services

Authors
de Queirós, RAP;

Publication
Gamification-Based E-Learning Strategies for Computer Programming Education

Abstract
The industry of video games is one of the fastest growing sectors in the worldwide economy. One of the key factors to increase engagement and player retention, was the use of various common game concepts such as leaderboards and achievements. The massive use of this approach and the impressive growth of players led to the concept of gamification as a service, later materialized in Game Backend as a Service (GBaaS). Instead of replicating the implementation of the game features in each version of the game for several platforms, GBaaS adhere to a service oriented architecture providing cross-platform game services that lets you easily integrate popular gaming features such as achievements, leaderboards, remote storage and real-time multiplayer in games. This chapter surveys several GBaaS based on the features they offer and on their openness for the integration with computer programming environments.

2016

Biomass combustion systems: A review on the physical and chemical properties of the ashes

Authors
Nunes, LJR; Matias, JCO; Catalao, JPS;

Publication
RENEWABLE & SUSTAINABLE ENERGY REVIEWS

Abstract
Biomass as an energy source contributes to a decrease in the dependence on imported fossil fuels, while at the same time, adding value to the countries where biomass fuel sources thrive, in addition to providing a source of renewable energy. Knowledge of the behaviour of fuel is essential in order to design and operate equipment safely and efficiently. In particular, knowledge about mineral content is essential because the ashes play an important role in the dynamics of the generation system. Through knowledge of the chemical composition and physical properties of the ashes, it is possible to predict the tendency to form deposits in the boiler components, as well as their potential to cause corrosion, erosion and abrasion. The behaviour of the ashes in the system is highly dependent on fuel, particularly when it comes from industrial waste or energy crops. These fuels have a higher mineral content, particularly sodium (Na), potassium (K), phosphorous (P) and chloride (Cl). They also have higher ash content with a low melting point and high corrosion potential. This paper focuses on the characteristics of the ashes derived from the combustion of biomass, with particular attention paid to the chemical transformations at high temperatures, as well as its effect on the combustion equipment. Emphasis is placed on the potential problems that occur when biomass-burning technologies are used for energy crops, in order to avoid catastrophic failures. It concludes with recommendations for the management, control and prevention of problems associated with ash.

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