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Optimized Complex Power Quality Classifier Using One vs. Rest Support Vector Machines

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Energy and Power Engineering 2017年第10期9卷 568-587页

作者： David De Yong Sudipto Bhowmik Fernando magnago Universidad Nacional de Río Cuarto Río Cuarto Argentina Nexant INC Chandler AZ USA

Nowadays, power quality issues are becoming a significant research topic because of the increasing inclusion of very sensitive devices and considerable renewable energy sources. In general, most of the previous power quality classification techniques focused on single power quality events and did not include an optimal feature selection process. This paper presents a classification system that employs Wavelet Transform and the RMS profile to extract the main features of the measured waveforms containing either single or complex disturbances. A data mining process is designed to select the optimal set of features that better describes each disturbance present in the waveform. Support Vector Machine binary classifiers organized in a “One Vs Rest” architecture are individually optimized to classify single and complex disturbances. The parameters that rule the performance of each binary classifier are also individually adjusted using a grid search algorithm that helps them achieve optimal performance. This specialized process significantly improves the total classification accuracy. Several single and complex disturbances were simulated in order to train and test the algorithm. The results show that the classifier is capable of identifying >99% of single disturbances and >97% of complex disturbances.

关键词： Complex Power Quality Optimal Feature Selection One vs. Rest Support Vector Machine Learning Algorithms Wavelet Transform Pattern Recognition

Monitoring and Controlling Services for Electrical Distribution Systems Based on the IEC 61850 Standard

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Energy and Power Engineering 2011年第3期3卷 299-309页

作者： Rodrigo Prat Gustavo Rodriguez Fernando magnago 不详

International standards are being developed to promote rapid configuration and integration into the utility automation system. In order to take advantage of modern technology to provide new benefits to users of substation automation, the International Electrotechnical Commission (IEC) has developed and released a new global standard for substation automation, named IEC 61850. This aim of this paper is to provide a basic technical overview of substation automation and the standard IEC 61850. It will discuss the benefits of each major aspect of this standard and it will describe how these concepts can be used in the development and implementation of tools related to Substation Automation. The application of communication standards and protocols to facilitate data exchange within the substation environment is presented. In addition, the model is implemented using a small distribution system that plans to utilize new communication technology following the IEC 61850 standard. Finally it proposes a set of laboratories to be used as the core of an undergraduate course. Results illustrate that the communication approach as proposed by IEC 61850 fulfills the real-time requirements for control and protection of distribution system.

关键词： Substation Automation IEC 61850

Turner-Kieser Syndrome or Iliac Horn Syndrome, a Challenge for the Anesthesiologist: A Case Report and a Literature Review

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Open Journal of Anesthesiology 2022年第3期12卷 99-104页

作者： Erika Amorim Melo Moreira Kelly Ribeiro Moura Barboza Suellen Leal Pagano Michelle magnago Ribeiro Vinicius Santana Nunes João magnago Santos Vila Velha University Department of Anesthesiology Vila Velha Brazil Vila Velha University Department of Gastroenterology Vila Velha Brazil Department of Anesthesiology Federal University of Esp&iacute rito Santo Vit&oacute ria Brazil Department of Anesthesiology Evang&eacute lico Hospital Vit&oacute ria Brazil

Turner-Kieser syndrome is a rare genetic disorder, autosomal dominant, which is related to variable gene expression and high penetrance, due to mutations in the LMX1B gene that affects connective tissue. The clinic has characteristics with alterations in nails, knees, elbows, and presence of iliac horns that makes the anesthetic difficult. However, data in the literature needs more research on this area. The present report is a cesarean section under general intravenous anesthesia performed on a 32-week pregnant woman due to the maternal risk of full-term evolution and aims to contribute to the anesthetic management of patients with this syndrome as there are few descriptions in the literature regarding the anesthetic management in Turner-Kieser syndrome. Even being a case report, the syndrome is rare and it is important to be reported to all anesthesiologists becoming aware of its management and to choose the best technique and anticipate possible complications. During general anesthesia, the technique chosen for the case reported here, we emphasize the risks of possible difficulty in intubating and positioning the patient, as well as renal impairment caused by changes in the cardiovascular autonomic response due to the choice of some drugs. Therefore, in the present report, our option was intravenous general anesthesia because of maternal complications, where fast acting drugs without renal metabolism or excretion were selected, resulting in an uneventful anesthetic procedure.

关键词： Rare Disease Pregnancy Anesthesia Neuraxial Block Case Report

Short-Term Scheduling of Combined Cycle Units Using Mixed Integer Linear Programming Solution

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Energy and Power Engineering 2013年第2期5卷 161-170页

作者： Juan Alemany Diego Moitre Herminio Pinto Fernando magnago Department of Electrical & Electronic Engineering National University of Rio Cuarto Rio Cuarto Argentina Nexant Inc. Chandler USA

Combined cycle plants (CCs) are broadly used all over the world. The inclusion of CCs into the optimal resource scheduling causes difficulties because they can be operated in different operating configuration modes based on the number of combustion and steam turbines. In this paper a model CCs based on a mixed integer linear programming approach to be included into an optimal short term resource optimization problem is presented. The proposed method allows modeling of CCs in different modes of operation taking into account the non convex operating costs for the different combined cycle mode of operation.

关键词： Combined Cycle Plants Unit Commitment Mixed Integer Linear Programming

Soil and altitude drive diversity and functioning of Brazilian Páramos(campo de altitude)

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Journal of Plant Ecology 2017年第5期10卷 771-779页

作者： Andreza Viana Neri Gladson Ramon Alves Borges João Augusto Alves Meira-Neto Luiz Fernando Silva magnago Ian Michael Trotter Carlos Ernesto GRSchaefer Stefan Porembski Departamento de Biologia Vegetal Laboratório de Ecologia e Evolução de PlantasUniversidade Federal de ViçosaPH RolfsS/NCampus UniversitárioViçosaMinas Gerais 36570-900Brazil Departamento de Biologia Setor de Ecologia e ConservaçãoUniversidade Federal de LavrasLavrasMinas Gerais 37200-000Brazil Departamento de Economia Rural Universidade Federal de ViçosaPH RolfsS/NCampus UniversitárioViçosaMinas Gerais 36570-900Brazil Departamento de Solos Universidade Federal de ViçosaPH RolfsS/NCampus UniversitárioViçosaMinas Gerais 36570-900Brazil Allgemeine und Spezielle Botanik Institut für BiowissenschaftenUniversität RostockWismarsche Str.8D-18051 RostockGermany

Aims the vegetation on Brazilian Páramos consists of assemblages that are driven mainly by the influence of strong environmental *** is very important to understand the effect of environmental varia-tion on taxonomic diversity and on functional *** the lack of information about the functional diversity in Brazilian Páramos,we analyzed for the first time the effects of altitude and edaphic attributes on functional traits,as well as on taxonomic and functional *** also wanted to answer the questions:Which ecological strategies are favorable in high-altitude grassland?Does soil attributes determine distributions of traits in high-altitude grassland?considering the studied altitudinal gradient is altitude an important variable in the community assembly?Methods the study was conducted on three mountains:Mammoth(1850 m),Elephant(1790 m)and totem(1690 m)in Serra do Brigadeiro State Park,Minas Gerais State,*** mountains represent the‘Serra das cabeças’,a smaller ridge that is surrounded by the Atlantic Forest,one of the 25 hotspot of *** samples were taken using 100 plots of 1 m2 per mountain that were randomly *** plants except mosses were *** taxonomic diversity was evaluated using richness,Shannon diversity,effective number of species and Pielou *** the functional diver-sity,we considered the functional richness,functional evenness and functional *** linear models(GLM/Poisson and quasi-Poisson)were used to evaluate the effect of abiotic variables(altitude,soil depth and soil chemical attributes)on biotic variables(number of species and individuals,life form,dispersal and fruit type)and ordinary least squares regression to evaluate the effect of abiotic variables on the functional and taxonomic *** Findingsthe soil variables presented a considerable edaphic gradient associated with *** soil in Serra das cabeças plays an important role for the

关键词： mountain conservation vegetation islands functional diversity life form highland grassland functional traits

Soil and climate equally contribute to changes in the species compositions of Brazilian dry forests across 300 km

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Journal of Plant Ecology 2020年第2期13卷 171-176页

作者： Daniel M.Arruda Luiz F.S.magnago Ricardo R.C.Solar Reinaldo Duque-Brasil Priscyla M.S.Rodrigues Rubens M.Santos Carlos E.G.R.Schaefer Instituto de Geociências Universidade Federal de Minas GeraisBelo HorizonteMinas GeraisBrazil Centro de Formação em Ciências e Tecnologias Agroflorestais Universidade Federal do Sul da BahiaItabunaBahiaBrazil Instituto de Ciências Biológicas Universidade Federal de Minas GeraisBelo HorizonteMinas GeraisBrazil Instituto de Ciências da Vida Universidade Federal de Juiz de ForaGovernador ValadaresMinas GeraisBrazil Colegiado de Ecologia Universidade Federal do Vale do São FranciscoSenhor do BonfimBahiaBrazil Departamento de Ciências Florestais Universidade Federal de LavrasLavrasMinas GeraisBrazil Departamento de Solos Universidade Federal de ViçosaViçosaMinas GeraisBrazil

Aims Understanding the factors that control biodiversity distributions at different spatial scales has been a key challenge for conservation *** biodiversity,reflected in differences in species compositions among sites(beta diversity),can be derived from species replacement(turnover)and is driven by multiple ***,we sought to tackle this issue through two questions related to threatened Brazilian seasonally dry forests:(i)what is the contribution of species turnover to beta diversity?and(ii)which factors drive variations in species compositions among forest patches?Methods We sampled tree species and environmental variables(soils and climate)in 17 dry forest patches spaced almost 300 km *** used the beta diversity partitioning framework to determine the contribution of *** used redundancy analysis,with properly controlled spatial structure,to assess the contributions of the environmental and spatial factors to the variations of the species *** Findings Beta diversity among the patches was mainly represented by the turnover component(98.2%),with Simpson dissimilarity superior to other regions of the country(means of 0.89 and 0.71 in multiple site and pairwise measures,respectively).The environmental factors measured explained more than space,representing 30.3%of the variation of the species composition,of which 28.1%was nonspatially *** suggest that 300 km represents a threshold at which edaphic and climatic predictors have similar effects in determining community turnover(14.9%and 12.6%,respectively,without spatial structure).Thus,conservation strategies should be considered across landscapes to effectively protect tropical forest diversity,as even considering the different climatic aspects covered by the scale,landscaped edaphic varieties are important drivers of species turnover.

关键词： beta diversity environmental filter habitat fragmentation landscape structure phytogeography

Multiple Criteria Analysis for Energy Storage Selection

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Energy and Power Engineering 2011年第4期3卷 557-564页

作者： Alexandre Barin Luciane N. Canha Alzenira R. Abaide Karine F. magnago Breno Wottrich Ricardo Q. Machado 不详

In view of the current and predictable energy shortage and environmental concerns, the exploitation of renewable energy sources offers great potential to meet increasing energy demands and to decrease depend- ence on fossil fuels. However, introducing these sources will be more attractive provided they operate in conjunction with energy storage systems (ESS). Furthermore, effective energy storage management is essential to achieve a balance between power quality, efficiency, costs and environmental constraints. This paper presents a method based on the analytic hierarchy process and fuzzy multi-rules and multi-sets. By exploiting a multiple criteria analysis, the proposed methods evaluate the operation of storage energy systems such as: pumped hydro and compressed air energy storage, H2, flywheel, super-capacitors and lithium-ion storage as well as NaS advanced batteries and VRB flow battery. The main objective of the study is to find the most appropriate ESS consistent with a power quality priority. Several parameters are used for the investigation: efficiency, load management, technical maturity, costs, environmental impact and power quality.

关键词： Multiple Criteria Analysis Fuzzy Sets AHP Method Energy Storage Systems Power Quality

Water availability drives gradients of tree diversity,structure and functional traits in the Atlantic-Cerrado-Caatinga transition,Brazil

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Journal of Plant Ecology 2018年第6期11卷 803-814页

作者： Marcela de Castro Nunes Santos Terra Rubens Manoel dos Santos Jamir Afonso do Prado Júnior José Marcio de Mello José Roberto Soares Scolforo Marco Aurélio Leite Fontes Ivan Schiavini Aliny Aparecida dos Reis Inacio Thomaz Bueno Luiz Fernando Silva magnago Hans ter Steege Departamento de Ciências Florestais Universidade Federal de LavrasCampus UniversitárioPO Box 3037LavrasMinas Gerais 37200-000Brazil Instituto de Biologia Universidade Federal de UberlândiaCampus Umuarama-Bloco 2DPO Box 593UberlândiaMinas Gerais 38400-902Brazil Applied Ecology and Conservation Lab Programa de Pós‐graduação Ecologia e Conservação da BiodiversidadeUniversidade Estadual de Santa CruzIlhéusBahia 45662-900Brazil Naturalis Biodiversity Center Vondellaan 55Postbus 95172300 RA LeidenThe Netherlands Coordenação de Botânica Museu Paraense Emílio GoeldiAv.Magalhães Barata 376PO Box 399BelémPara´66040-170Brazil

Aims Climate and soil are among the most important factors determin-ing variation in tree communities,but their effects have not been thoroughly elucidated to date for many vegetation *** this study,we evaluate how climate and soil gradients affect gradients of vegetation composition,species diversity and dominance,structure and functional traits(seed mass and wood density)using over 327000 trees in 158 sites distributed along environmental gradients in the transitions among the Atlantic forest,Cerrado and Caatinga in Minas Gerais State(MG),Brazil(nearly 600000 km2).Methods Gradients in species,genus and family abundance in addition to basal area,stem density,species diversity(Fisher’s alpha),domin-ance percentage,seed mass and wood density were correlated using multiple regressions with environmental variables,as summarized in four principal component analysis axes(two climatic-precipi-tation seasonality and temperature range-and two edaphic-soil fertility and soil moisture).Additionally,ordinary kriging maps were used to better illustrate the *** Findings Multiple regression models indicate that all variables but domin-ance percentage were affected by one or more of the environmental gradients,but the average R2 was low(26.25%).Kriging maps rein-forced the patterns observed in the regression *** seasonality and soil moisture gradients were the most important gra-dients affecting vegetation *** finding suggests that water availability is an important determinant of vegetation features in these vegetation transitions.

关键词： climate environmental gradient soil southeastern Brazil vegetation

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贝尔格曼街住宅,格拉茨,奥地利

世界建筑 2002年第9期 84-87页

作者： V.M.兰普格纳尼 M.德利 S.里戈尼

该群住宅位于离玛丽亚·兰库维茨市中心约500m的一处三角地段,其西北沿兰库维茨河.

关键词：居住环境建筑设计环境设计贝尔格曼街住宅