2020
Authors
Sa Correia, L; Correia, ME; Cruz Correia, R;
Publication
PROCEEDINGS OF THE 13TH INTERNATIONAL JOINT CONFERENCE ON BIOMEDICAL ENGINEERING SYSTEMS AND TECHNOLOGIES, VOL 5: HEALTHINF
Abstract
Complex data management on healthcare institutions makes very hard to identify illegitimate accesses which is a serious issue. We propose to develop a system to detect accesses with suspicious behavior for further investigation. We modeled use cases (UC) and sequence diagrams (SD) showing the data flow between users and systems. The algorithms represented by activity diagrams apply rules based on professionals' routines, use data from an audit trail (AT) and classify accesses as suspicious or normal. The algorithms were evaluated between 23rd and 31st July 2019. The results were analyzed using absolute and relative frequencies and dispersion measures. Access classification was in accordance to rules applied. "Check time of activity" UC had 64,78% of suspicious classifications, being 55% of activity period shorter and 9,78% longer than expected, "Check days of activity" presented 2,27% of suspicious access and "EHR read access" 79%, the highest percentage of suspicious accesses. The results show the first picture of HIS accesses. Deeper analysis to evaluate algorithms sensibility and specificity should be done. Lack of more detailed information about professionals' routines and systems. and low quality of systems logs are some limitations. Although we believe this is an important step in this field.
2020
Authors
Massignan, JAD; London, JBA; Miranda, V;
Publication
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
Abstract
This paper develops a novel approach to track power system state evolution based on the maximum correntropy criterion, due to its robustness against non-Gaussian errors. It includes the temporal aspects on the estimation process within a maximum-correntropy-based extended Kalman filter (MCEKF), which is able to deal with both nonlinear supervisory control and data acquisition (SCADA) and phasor measurement unit (PMU) measurement models. By representing the behavior of the state variables with a nonparametric model within the kernel density estimation, it is possible to include abrupt state transitions as part of the process noise with non-Gaussian characteristics. Also, a novel strategy to update the size of Parzen windows in the kernel estimation is proposed to suppress the effects of suspect samples. By properly adjusting the kernel bandwidth, the proposed MCEKF keeps its accuracy during sudden load changes and contingencies, or in the presence of bad data. Simulations with IEEE test systems and the Brazilian interconnected system are carried out. The results show that the method deals with non-Gaussian noises in both the process and measurement, and provides accurate estimates of the system state under normal and abnormal conditions.
2020
Authors
Umaraliev, R; Moura, R; Havenith, H; Almeida, F; Nizamiev, AG;
Publication
European Journal of Engineering Research and Science
Abstract
2020
Authors
Costa, J; Rodrigues, C;
Publication
Global Business and Economics Review
Abstract
The science and technology (S&T) binomial is often considered in the literature as an innovation system per se. Different theoretical frameworks, such as the 'national innovation systems', 'regional innovation systems' and the 'triple helix', were put forward in order to conceptualising the role of a diversity of agents in innovation processes underpinning knowledge-driven economies. More recently, the conceptual framework of smart specialisation has reinforced the importance of innovation and its diffusion in the entrepreneurial sector. Universities are still deemed as having a potentially pivotal role to play, not only in knowledge production but also in innovation delivery. The goal of this research is to discuss the importance of universities as sources of knowledge for innovative activities in Portugal. A panel comprising three waves of the CIS was built to estimate a hurdle model, the discussion of the estimation results attempt to provide some policy recommendations on the role of universities in knowledge production and diffusion and its connection to innovative firms. © 2020 Inderscience Enterprises Ltd.
2020
Authors
Filipe, S; Barbosa, B; Santos, CA;
Publication
Advances in Hospitality, Tourism, and the Services Industry - Global Opportunities and Challenges for Rural and Mountain Tourism
Abstract
2020
Authors
Vasconcelos, PB; Ribeiro, RP;
Publication
First International Computer Programming Education Conference, ICPEC 2020, June 25-26, 2020, ESMAD, Vila do Conde, Portugal (Virtual Conference).
Abstract
This paper reports on the use of property-based testing for providing feedback to C programming exercises. Test cases are generated automatically from properties specified in a test script; this not only makes it possible to conduct many tests (thus potentially find more mistakes), but also allows simplifying failed tests cases automatically. We present some experimental validation gathered for an introductory C programming course during the fall semester of 2018 that show significant positive correlations between getting feedback during the semester and the student's results in the final exam. We also discuss some limitations regarding feedback for undefined behaviors in the C language. 2012 ACM Subject Classification Social and professional topics ! Student assessment; Software and its engineering ! Software testing and debugging; Software and its engineering ! Domain specific languages.
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