2020
Autores
Costa, J;
Publicação
Advances in Public Policy and Administration - Financial Determinants in Local Re-Election Rates
Abstract
2020
Autores
Campos, R; Jorge, AM; Jatowt, A; Bhatia, S; Rocha, C; Cordeiro, JP;
Publicação
CEUR Workshop Proceedings
Abstract
2020
Autores
Andrade, T; Gama, J;
Publicação
Mobility Internet of Things 2018 - EAI/Springer Innovations in Communication and Computing
Abstract
2020
Autores
Sa Correia, L; Correia, ME; Cruz Correia, R;
Publicação
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
Autores
Massignan, JAD; London, JBA; Miranda, V;
Publicação
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
Autores
Umaraliev, R; Moura, R; Havenith, H; Almeida, F; Nizamiev, AG;
Publicação
European Journal of Engineering Research and Science
Abstract
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