Carlos Fernando Jung

RFID‐Env: methods and software simulation for RFID environments

Purpose – The purpose of this paper is to present the results of an analytical and experimental research for the development of an innovative product designated RFID environment (RFID‐Env). This software is designed for the use of professionals in computer systems and plant engineering who are engaged in research and development (R&D) of ultra high frequency (UHF) passive radio frequency identification (RFID) systems as applied to the management and operation of logistic supply chains.Design/methodology/approach – The RFID‐Env makes it possible to simulate on computer screens a complete RFID‐Env by processing user data on the technical and physical characteristics of real or virtual RFID‐Envs. Information outputted can include descriptions of the performance to be expected from a given configuration and detailed reports as to whether that particular configuration will succeed in reading all the RFID tags flowing through a defined system.Findings – The paper shows the models and methods on how these simula...

18 comparative aspects between Lean and Six Sigma

Purpose – This paper aims to presents a conceptual comparative analysis of Lean manufacturing and Six Sigma, highlighting 18 critical aspects between such approaches and their respective implications for management decision-making. Design/methodology/approach – Qualitative approach based on the results obtained from literature review about Lean and Six Sigma. Findings – The main points of divergence between Lean and Six Sigma have been highlighted based on 18 criteria. Seventeen criteria are proposed as a result of a review of the literature and one criterion, and “quality control”, is suggested by the authors. Research limitations/implications – This article mitigates the literature gap regarding whether and how Lean and Six Sigma are synergistic approaches. Practical implications – This study enables decision-makers to evaluate the Lean and Six Sigma practices. The results of the analysis performed originated three observations: first, both approaches are predominantly complementary; second, it is possi...

APLICAÇÃO DO PROJETO DE EXPERIMENTOS PARA OTIMIZAÇÃO DE UMA INOVAÇÃO TECNOLÓGICA

Este artigo apresenta os resultados da aplicacao da tecnica de planejamento de experimentos (DOE) em uma inovacao de media complexidade tecnologica. Trata-se de uma churrasqueira portatil, construida a partir da reutilizacao de um botijao de gas para refrigeracao considerado como residuo apos a utilizacao do gas. O objetivo do experimento foi determinar quais os fatores que influenciam na variavel de resposta tempo de coccao para assar distintos tipos de carne na churrasqueira portatil. O planejamento do experimento foi realizado utilizando-se a tecnica de Projeto de Experimentos. Foi utilizado um projeto fatorial fracionado 25-1 sem repeticoes contemplando 16 ensaios. Os resultados foram analisados utilizando-se a analise de regressao onde foram investigadas, alem dos fatores principais, as interacoes de dois fatores. Com a equacao de regressao e possivel prever os tempos de coccao para cada uma das combinacoes dos niveis dos fatores controlaveis.

Análise de referências utilizadas por pesquisadores na revista Gestão & Produção

This article presents the results of a descriptive research with quantitative approach and strategy based on the documentary method, with the aim of analyzing the references listed in articles appearing in regular publications of the Journal “Gestao & Producao” by adapting the concepts of bibliometric citation analysis. Given the objective of the research, an analysis was made of the reference lists specifying: 1) how subjects investigated the documents referenced in the articles, 2) as elements of deterministic variables obtained by analyzing references and, 3) as the type of bibliographic research resource. Based on these parameters, documents were analyzed used in the theoretical basis of the articles by means of identification, mapping and quantitative determination: a) of the items listed in each study; b) the mean life of the literature; c) the language; d) the frequency of use of references and; e) research front. As a result, the main aspects of the sources of researches on which studies in Production Engineering and its sub areas are based were mapped.

Deterministic propagation model for RFID using site-specific and FDTD

The conduction of experiments to evaluate a tag orientation and its readability in a laboratory offers great potential for reducing time and costs for users. This article presents a novel methodology for developing simulation models for RFID (radio-frequency identification) environments. The main challenges in adopting this model are: (1) to find out how the properties of each one of the materials, on which the tag is applied, influence the read range and to determine the necessary power for tag reading and (2) to find out the power of the backscattered signal received by the tag when energised by the RF wave transmitted by the reader. The validation tests, performed in four different kinds of environments, with tags applied to six different kinds of materials, six different distances and with a reader configured with three different powers, showed achievements on the average of 95.3% accuracy in the best scenario and 87.0% in the worst scenario. The methodology can be easily duplicated to generate simulation models to other different RFID environments.

ESTRATÉGIAS DE REDUÇÃO DA VARIABILIDADE DE PROCESSOS NA INDÚSTRIA CALÇADISTA

EnglishThis article presents a case study of a Brazilian company, operating in the footwear sector, located in Parobe city, in the Valley of Paranhana, in the state of Rio Grande do Sul. The process analyzed showed high failure rates of manufactured batches and by quality analysis tools, the Statistical Process Control tools were applied to analyze the variability. The tools applied were the control charts, process capacity and capability analysis, histogram, Pareto chart and cause and effect analysis. The main results of the study were the reduction of the rejection indices of the process to zero and improvement in the capacity index from 0,424 to 1,52, demonstrating the reduction of the sources of variation of the production process and reaching the objectives The research. This research can be used by academics and professionals to improve the competitive performance of footwear companies portuguesEste artigo apresenta um estudo de caso de uma empresa brasileira, atuante no setor calcadista, localizada na cidade de Parobe, no Vale do Paranhana, no estado do Rio Grande do Sul. O processo analisado demonstrava altos indices de reprovacao dos lotes fabricados e atraves da analise de ferramentas da qualidade, aplicaram-se as ferramentas do controle estatistico de processo para analisar a variabilidade. As ferramentas aplicadas foram ascartas de controle, analise de capacidade e capabilidade do processo, histograma, grafico de Pareto e a analise de causa e efeito. Como principais resultados do estudo, identificaram-se a reducao dos indices de rejeicao do processo para zero, e melhoria no indice do capabilidade de 0,424 para 1,52, demonstrando a reducao das fontes de variacao do processo produtivo e atingindo-se os objetivos da pesquisa. Essa pesquisa pode ser usada por academicos e profissionais para melhorar o desempenho competitivo de empresas calcadistas

REDUÇÃO DO IMPACTO AMBIENTAL NA PRODUÇÃO DE CERÂMICAS: IMPLICAÇÕES E ANÁLISE DE INVESTIMENTOS

A fabricacao de cerâmica e tijolos e por natureza geradora de altos indices de perdas e residuos ambientais. O presente estudo avaliou a partir das tecnicas de controle estatistico de processos um possivel investimento a ser realizado no processo de extrusao e verificou o resultado de um investimento realizado no processo de secagem visando minimizar os impactos ambientais e otimizar os processos. Os principais resultados da pesquisa mostraram que a melhoria no processo de extrusao atraves da aquisicao de uma retifica se mostrou economicamente viavel, uma vez que o tempo de amortizacao do investimento ficou satisfatorio para a empresa. Ja no caso da melhoria no processo de secagem, o tempo de amortizacao do investimento foi avaliado em sessenta e dois meses, que apesar de ser um tempo elevado em termos estrategicos, tal melhoria faz parte de um programa de ampliacao da producao da industria estudada. Concluiu-se que as tecnicas de controle estatistico de processos podem ser usadas de forma relevante para a decisao de investimentos que envolvem reducao do impacto ambiental e otimizacao da producao da producao de cerâmicas.

Balanceamento de fluxo ou balanceamento de capacidade? análises e proposições sistêmicas

Manufacturing performance improvement can be achieved in several different ways. On the one hand, the search for high efficiency and maximized utilization in all system resources through balancing the capacity of productive resources, for example, is still a common practice in manufacturing companies. On the other hand, there are companies that adopt flow balancing practices in their production system, which promote high efficiency and utilization only in the restrictive resources of the system, the bottlenecks. Given these possibilities, the main objective of this paper is to evaluate the manufacturing implications and differences between flow balancing and capacity balancing. An analysis identifying the variables that are critical to this managerial decision making process was carried out. A literature review on this topic was conducted, and subsequently, the analysis was performed based on the System Thinking approach. This approach, among other things, allows the identification of effect-cause-effect relationships. The results obtained demonstrated points of convergence and divergence between these two views. It was found that adopting managerial decisions considering flow balancing combined with certain practices of capacity balancing can help increase the company overall gains.

Um modelo para avaliação do potencial estratégico de projetos de p&d de inovação tecnológica

This paper presents a model for assessing the strategic potential of Research & Development (R&D) projects in technological innovation applied to Program of Technology Innovation Centers of the State of Rio Grande do Sul, Brazil Through a bibliographical study, were analyzed models of selection and prioritization of projects, the Critical Success Factor (CSF), guidelines of the Program and treatment methods and data processing. We propose a platform for acquisition, processing and data output, together with a set of indicators to establish a strategic score that allows the selection and ranking of projects. The model proposed in addition to select and rank projects in R &D facilitates the evaluation of strengths and weaknesses of the analyzed projects.

Percepção de alunos de engenharia de produção acerca da utilização da metodologia da problematização no ensino de QFD

This paper presents the results of a case study that had the purpose to evaluate the students’ perception about the use of the problematization methodology, to teach QFD method (Quality Function Deployment) in a Course of Engineering of Production, in the south of the Brazil. The problematization methodology contemplates a didactic-pedagogic approach starting from real situation-problem. The steps used for validation of the work were: (i) systematic presentation of the QFD method for the students, (ii) attendance and aid in the practical application of the method in local industries (iii) evaluation of the diffi culties and of the acquired knowledge by the students. The results demonstrate the possibility to teach QFD through practical situations lived in the day by day for the students, in a short space of time and in an effective way, offering a signifi cant learning.