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Systematic exploration of signal-based indicators for failure diagnosis in the context of cyber-physical systems

Frontiers of Information Technology & Electronic Engineering 2019年第2期20卷 152-175页

作者： santiago ruiz-arenas Zoltán RUSáK Imre HORVáTH Ricardo MEJí-GUTIERREZ Faculty of Industrial Design Engineering Delft University of Technology Grupo de Investigación en Ingeniería de Diseno Universidad EAFIT

Malfunction or breakdown of certain mission critical systems(MCSs) may cause losses of life, damage the environments, and/or lead to high costs. Therefore, recognition of emerging failures and preventive maintenance are essential for reliable operation of MCSs. There is a practical approach for identifying and forecasting failures based on the indicators obtained from real life processes. We aim to develop means for performing active failure diagnosis and forecasting based on monitoring statistical changes of generic signal features in the specific operation modes of the system. In this paper, we present a new approach for identifying emerging failures based on their manifestations in system signals. Our approach benefits from the dynamic management of the system operation modes and from simultaneous processing and characterization of multiple heterogeneous signal sources. It improves the reliability of failure diagnosis and forecasting by investigating system performance in various operation modes, includes reasoning about failures and forming of failures using a failure indicator matrix which is composed of statistical deviation of signal characteristics between normal and failed operations, and implements a failure indicator concept that can be used as a plug and play failure diagnosis and failure forecasting feature of cyber-physical systems. We demonstrate that our method can automate failure diagnosis in the MCSs and lend the MCSs to the development of decision support systems for preventive maintenance.

关键词： Failure indicators Failure classification Failure detection and diagnosis Complex systems

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Do Pregnant Teens Have Higher Risk of Intimate Partner Violence than Pregnant Adult Women in Mexico?

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Health 2014年第20期6卷 2814-2824页

作者： Rosario Valdez santiago Mariana Mojarro Iñ iguez Elisa Hidalgo Solorzano Leticia Avila Burgos Luz arenas Monreal WHO Collaborating Centre for Injuries and Violence Research National Institute of Public Health (INSP/Mexico) Cuernavaca Mexico

Objective: The objective of the study is to estimate the prevalence of Intimate Partner Violence (IPV) and identify factors linked to it in pregnant Mexican adult and adolescent women. Methods: Data were gathered by the National Survey of Violence against Women (2006), applied to women between the ages 15-49, users of Mexican public health institutions. Multinomial logistic regression analyses were performed to explore the significant factors associated with IPV against pregnant women. Results: Both adolescent and adult study participating women showed a 24% prevalence of current IPV (during the previous 12 months). The study’s multivariate model for adult women revealed the following as main predictors for IPV: a woman’s agreement with traditional gender roles (OR = 4.35, CI95% = 2.20 - 8.60), and women with a history of childhood sexual abuse (OR = 2.76, CI95% = 1.68 - 4.55). The main predictor of IPV in pregnant adolescents was their partners’ frequency of alcohol consumption: often/usually (OR = 6.49, CI95% = 2.18 - 19.33). Conclusion: To this date, Mexico has not been able to guarantee universal screening methods for IPV as a part of prenatal care protocols. The phenomenon of IPV towards pregnant women neither has been followed-up by further research nor has been identified as a public health problem in spite of the seriousness of its implications for women and their offspring.

关键词： Partner Violence in Pregnancy Adolescents & Adults Mexico

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On Simple Completely Reducible Binary-Lie Superalgebras over sl<sub>2</sub>(F)

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Advances in Pure Mathematics 2015年第5期5卷 314-323页

作者： Manuel arenas Departamento de Matemática Facultad de Ciencias Universidad de Chile Santiago Chile

In this article, we prove that if B is a simple binary-Lie superalgebra whose even part is isomorphic to sl2(F) ?and whose odd part is a completely reducible binary-Lie-module over the even part, then B is a Lie super... 详细信息

关键词： Binary-Lie Super-Algebras

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MillenniumDB:An Open-Source Graph Database System

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Data Intelligence 2023年第3期5卷 560-610页

作者： Domagoj Vrgoc Carlos Rojas Renzo Angles Marcelo arenas Diego Arroyuelo Carlos Buil-Aranda Aidan Hogan Gonzalo Navarro Cristian Riveros Juan Romero Instituto Milenio Fundamentos de los Datos(IMFD) Vicuna Mackenna 4860Macul 7820436Chile Pontificia Universidad Catolica de Chile San JoaquinSantiago 7820436Chile Universidad de Talca Camino Los Niches Km.1CuricoRegion del Maule 3340000Chile Universidad Tecnica Federico Santa Maria Avenida Espana 1680Valparaiso 2390123Chile DCC Universidad de ChileBeauchef 851Edificio NorteTercer PisoSantiagoRegion Metropolitana 8370456Chile

In this systems paper,we present MillenniumDB:a novel graph database engine that is modular,persistent,and open *** is based on a graph data model,which we call domain graphs,that provides a simple abstraction upon which a variety of popular graph models can be supported,thus providing a flexible data management engine for diverse types of knowledge *** engine itself is founded on a combination of tried and tested techniques from relational data management,state-of-the-art algorithms for worst-case-optimal joins,as well as graph-specific algorithms for evaluating path *** this paper,we present the main design principles underlying MillenniumDB,describing the abstract graph model and query semantics supported,the concrete data model and query syntax implemented,as well as the storage,indexing,query planning and query evaluation techniques *** evaluate MillenniumDB over real-world data and queries from the Wikidata knowledge graph,where we find that it outperforms other popular persistent graph database engines(including both enterprise and open source alternatives)that support similarqueryfeatures.

关键词： Graph databases Knowledge graphs Worst-case optimal joins Domain graphs

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Thiol-Mediated Reduction of <i>Staphylococcus aureus</i>Tellurite Resistance

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Advances in Microbiology 2014年第4期4卷 183-190页

作者： Benoit Pugin Fabián A. Cornejo Jaime A. García Waldo A. Díaz-Vásquez Felipe A. arenas Claudio C. Vásquez Departamento de Biología Facultad de Química y Biología Universidad de Santiago de Chile Santiago Chile Departamento de Biología Facultad de Química y Biología Universidad de Santiago de Chile Santiago Chile Facultad de Ciencia Universidad San Sebastián Santiago Chile

The goal of this work was to enhance tellurite toxicity against Gram positive bacteria, especially Staphyloccocus aureus. Using a combination of assays (growth inhibition zones, growth curves, and minimal inhibitory concentrations), tellurite toxicity against this bacterium was tested in the presence of various SH- and OH-containing compounds. Results showed that the noxiousness of tellurite was strongly enhanced in the presence of 2-mercaptoethanol or dithiothreitol. The potentiating effect was observed in S. aureus ATCC 6538 (the model organism of this study) and in other Gram positive bacteria such as Bacillus subtillis ATCC 6051 and the methicillin-resistant S. aureus strain 622-4. No enhancing effect was observed in Gram negative bacteria such as Escherichia coli BW25113, Salmonella Typhimurium LT2 and Klebsiella pneumoniae ATCC 11388. These results open new perspectives for studying the treatment of multidrug-resistant Gram positive bacteria, which are responsible for numerous nosocomial infections.

关键词： Tellurite 2-Mercaptoethanol Tellurite Toxicity Staphylococcus aureus

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