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Publicações

2018

The information and communication technologies in tourism degree courses - The Portuguese evolution [As Tecnologias de Informação e Comunicação nas licenciaturas de Turismo - a evolução em Portugal]

Autores
Morais, EP; Cunha, CR; Gomes, JP;

Publicação
Iberian Conference on Information Systems and Technologies, CISTI

Abstract
Information and Communication Technologies appear one of the most critical areas to the success of tourism in the future and the way it will promote the tourist destinations. This paper aims to analyze the relevance given by the various Portuguese institutions of higher education to Information and Communication Technologies in their degrees. The analysis carried out was done in degree courses operating in this academic year, 2017/2018, in Portuguese universities and polytechnics, public and private. A comparison was also made with the reality of 2012/2013, since as undergraduate degrees have been evaluated by the Agency for Assessment and Accreditation of Higher Education (A3ES), often making changes, resulting from the evaluation. © 2018 AISTI.

2018

Triple-Similarity Mechanism for alarm management in the cloud

Autores
Dalmazo, BL; Vilela, JP; Curado, M;

Publicação
COMPUTERS & SECURITY

Abstract
Its distributed nature and ubiquitous service make the cloud subject to several vulnerabilities. One of the main tools used for reporting suspicious activity in the network's traffic is the Intrusion Detection System. However, two significant problems arise: the huge volume of control messages between the virtual machines and the servers; and the associated transfer costs. In this work, we propose a Triple-Similarity Mechanism (T-SyM) for grouping similar alarms that may correspond to the same attack (or attempt) in order to reduce the number of messages and, consequently, the total amount of information. In addition, we propose an algorithm for calculating the severity level of the alarms. T-SyM works on the basis of 3 steps: individual similarity (Euclidian distance), clustering relevant features (k-means algorithm) and generating the output (the Tanimoto coefficient). An evaluation of the most common attacks is performed using real traces from an IDS. Our mechanism was able to decrease the number of alarms by up to 90% and reduce the total amount of data by more than 80%.

2018

Development of a Dynamic Path for a Toxic Substances Mapping Mobile Robot in Industry Environment

Autores
Piardi, L; Lima, J; Costa, P; Brito, T;

Publicação
Advances in Intelligent Systems and Computing

Abstract
Some industries have critical areas (dangerous or hazardous) where the presence of a human must be reduced or avoided. In some cases, there are areas where humans should be replaced by robots. The present work uses a robot with differential drive to scan an environment with known and unknown obstacles, defined in 3D simulation. It is important that the robot be able to make the right decisions about its way without the need of an operator. A solution to this challenge will be presented in this paper. The control application and its communication module with a simulator or a real robot are proposed. The robot can perform the scan, passing through all the waypoints arranged in a grid. The results are presented, showcasing the robot’s capacity to perform a viable trajectory without human intervention. © Springer International Publishing AG 2018.

2018

A Decentralized Electricity Market Scheme Enabling Demand Response Deployment

Autores
Bahrami, S; Amini, MH; Shafie khah, M; Catalao, JPS;

Publicação
IEEE TRANSACTIONS ON POWER SYSTEMS

Abstract
In smart grid, demand response (DR) programs can be deployed to encourage electricity consumers towards scheduling their controllable demands to off-peak periods. Motivating the consumers to participate in a DR program is a challenging task, as they experience a confidential discomfort cost by modifying their load demand from the desirable pattern to the scheduled pattern. Meanwhile, to balance the load and generation, the independent system operator (ISO) requires to motivate the suppliers towards modifying their generation profiles to follow the changes in the load demands. Additionally, to protect the entities' privacy, the ISO needs to apply an effective well-designed pricing scheme. In this paper, we focus on proposing a decentralized DR framework considering the operating constraints of the grid. In our proposed framework, each individual entity responds to the control signals called conjectured prices from the ISO to modify its demand or generation profile with the locally-available information. We formulate the centralized problem of the ISO that jointly minimizes the suppliers' generation cost and the consumers' discomfort cost. We also discuss how the ISO determines the conjectured prices to motivate the entities toward an operating point that coincides with the solution to the centralized problem. The performance of the proposed algorithm is evaluated on a modified IEEE 14-bus in reducing the suppliers' and consumers' cost, as well as the transmission lines congestion.

2018

Automatic Test Case Generation from Usage Information

Autores
Silva, P; Paiva, ACR; Restivo, A; Garcia, JE;

Publicação
2018 11TH INTERNATIONAL CONFERENCE ON THE QUALITY OF INFORMATION AND COMMUNICATIONS TECHNOLOGY (QUATIC)

Abstract
Nowadays, web applications play an important role in our society and in the business world. Many companies earn a large part of their revenues through web applications that provide support services that must be maintained and improved over time. Most of these services operate on a large scale and are in constant change due to the environment in which they operate and due to the rapid technological evolution as we strive to improve our everyday lives. Due to this constantly changing environment, it is difficult to estimate the impact of changes; to maintain the software requirements documents updated; and to build and maintain a test suit for regression testing. Regression tests must be updated continually in order to test the current behavior after requested changes are implemented. REQAnalytics is a tool that aims to solve these problems. This paper presents REQAnalytics and an extension to generate test cases from the usage of a SaaS platform in order to diminish the effort in building and maintaining regression tests that are useful to check if the SaaS platform remains working as expected.

2018

Synergies of electric urban transport systems and distributed energy resources in smart cities

Autores
Calvillo C.; Sanchez-Miralles A.; Villar J.;

Publicação
IEEE Transactions on Intelligent Transportation Systems

Abstract
Transport systems and buildings are among the bigger energy users inside cities. Abundant research has been developed about these systems (facilities and transport). However, synergies among them are commonly overlooked, not taking advantage of the possible benefits of their joint coordination and management. This paper presents a linear programming model to find the optimal operation and planning of distributed energy resources (DER) in a residential district, while considering electric private and public transport systems, in particular electric vehicles and metro. Hence, the main contribution of this paper is the analysis of synergies of such an interconnected scheme. It has been assumed that part of the metro regenerative braking energy can be stored into electric vehicles' (EVs') batteries, so that it can be used later for other trains or for the EV itself. Several case studies have been proposed using data from a residential district and a metro line in Madrid. The obtained results show important cost savings in the overall system, especially a significant power cost reduction for the metro system.

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