J
Joaquim L. Viegas
Researcher at Instituto Superior Técnico
Publications - 31
Citations - 589
Joaquim L. Viegas is an academic researcher from Instituto Superior Técnico. The author has contributed to research in topics: Cluster analysis & Fuzzy clustering. The author has an hindex of 9, co-authored 30 publications receiving 393 citations. Previous affiliations of Joaquim L. Viegas include University of Lisbon.
Papers
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Journal ArticleDOI
Solutions for detection of non-technical losses in the electricity grid: A review
TL;DR: A typology for the categorization of solutions for detection of non-technical losses is proposed and the sources and possible attack/vulnerability points are identified.
Journal ArticleDOI
Classification of new electricity customers based on surveys and smart metering data
Joaquim L. Viegas,Susana M. Vieira,Rui Melício,Rui Melício,Victor Mendes,Victor Mendes,João M. C. Sousa +6 more
TL;DR: This paper proposes a process for the classification of new residential electricity customers using a combination of smart metering and survey data and model-based feature selection, allowing an easy interpretation of the derived models.
Journal ArticleDOI
Clustering-based novelty detection for identification of non-technical losses
TL;DR: The proposed clustering-based novelty detection method for identification of non-technical losses, using the Gustafson-Kessel fuzzy clustering algorithm, achieves a true positive rate of 63.6% and false negative rate of 24.3%, outperforming other state-of-the-art unsupervised learning methods.
Journal ArticleDOI
Takagi–Sugeno Fuzzy Modeling Using Mixed Fuzzy Clustering
Catia M. Salgado,Joaquim L. Viegas,Carlos Azevedo,Marta C. Ferreira,Susana M. Vieira,João M. C. Sousa +5 more
TL;DR: The use of mixed fuzzy clustering (MFC) algorithm to derive Takagi–Sugeno (T–S) fuzzy models (FMs) is proposed, which outperform FCM-based T–S FMs in four out of five datasets and k-nearest neighbors classifiers in five out ofFive datasets.
Journal ArticleDOI
A Middleware Platform for Intelligent Automation: An Industrial Prototype Implementation
Tiago Coito,Miguel S. E. Martins,Joaquim L. Viegas,Bernardo M. Firme,João Figueiredo,Susana M. Vieira,João M. C. Sousa +6 more
TL;DR: This paper proposes a platform for intelligent automation relying on a gateway or middleware between field devices, enterprise databases, and DSSs in real-time scenarios, and presents an implementation of the platform in the pharmaceutical industry, providing interoperability and real- time reaction capability to changes to an industrial prototype using dynamic scheduling algorithms.