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Search Results: 1 - 10 of 17627 matches for " Miguel Afonso; "
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Processos de pensamento da TOC como alternativa sistêmica de análise organizacional: uma aplica??o em saúde pública
Sellitto, Miguel Afonso;
Gest?o & Produ??o , 2005, DOI: 10.1590/S0104-530X2005000100008
Abstract: this paper discusses the use of the toc (theory of constraints) thought process as an alternative to systemic organizational analyses. we begin with a conceptual review of systemic thought, a reference to one of the various methods available in the literature, and a review of the basics and main concepts of the toc. this is followed by the discussion of a case study, in which the toc method was applied in a public health service organization, and a comparison of the toc method and the systemic method. the conclusion of this paper discusses the relation between the methods and systemic situations, outlining the kinds of situation in which each method seems to work best by producing acceptable organizational results.
Inteligência Artificial: uma aplica??o em uma indústria de processo contínuo
Sellitto, Miguel Afonso;
Gest?o & Produ??o , 2002, DOI: 10.1590/S0104-530X2002000300010
Abstract: this paper describes an application of the fuzzy logic control and cbr in the continuous process industry. the techniques are discussed inside the larger branch of knowledge called artificial intelligence (ai), which can be related with the decision-making process in companies. artificial intelligence is pinpointed as a science that can support decisions in an easier and more precisely way than others methods as models and process indicators management. the steps for the erection of an expert system, built mainly from human empirical experiences, are also discussed. the paper comes to an end by presenting a decision-making routine in a thermochemical process, in the cement industry, as performed by an expert system decision-maker, based in cbr and fuzzy logic, and leading to a discussion about results and performance gains, in comparison with human-guided action in the same process.
Formula??o estratégica da manuten??o industrial com base na confiabilidade dos equipamentos
Sellitto, Miguel Afonso;
Produ??o , 2005, DOI: 10.1590/S0103-65132005000100005
Abstract: this paper reports the use of reliability and maintainability assessments in the strategic formulation of industrial maintenance. the method was a double case study. the paper begins by a theoretical review of related concepts of stochastic variables and processes as a basis to address concepts and features from reliability studies and modeling, suited to use in managing the industrial maintenance. one then describes the two studied cases, in which the reliability techniques were applied, in modeling the times to failure and times to the repair for the sake of settling the strategic formulation of industrial maintenance in metal-mechanic plants. supported by results, this paper discusses the cases, arising requirements to the use of the reliability, mainly related to the information system.
Inteligência Artificial: uma aplica o em uma indústria de processo contínuo
Sellitto Miguel Afonso
Gest?o & Produ??o , 2002,
Abstract: Este trabalho descreve uma aplica o da lógica fuzzy de controle e do CBR (Raciocínio Baseado em Casos) na indústria de processo contínuo. Essas técnicas s o discutidas dentro do campo de conhecimentos da Inteligência Artificial, associadas ao processo de tomada de decis es empresariais. A Inteligência Artificial é apontada como um campo de conhecimentos que pode apoiar a tomada de decis es de um modo mais simples e mais preciso do que outros métodos, tais como a modelagem e a gest o por indicadores. As etapas para a constru o de um sistema especialista, construído principalmente a partir de experiências empíricas humanas, também s o discutidas. O trabalho se encerra apresentando uma rotina de tomada de decis o em um processo termoquímico na indústria cimenteira conduzida por um sistema especialista baseado em CBR e lógica fuzzy, e uma discuss o sobre resultados comparados com operadores humanos nas mesmas condi es.
Medi??o do inventário em processo e tempo de atravessamento em manufatura por modelagem em redes de Petri e diagrama de resultados
Facchin, Tiago;Sellitto, Miguel Afonso;
Gest?o & Produ??o , 2008, DOI: 10.1590/S0104-530X2008000200008
Abstract: this paper presents a method to measure work-in-process and leadtime in a manufacturing system. the method consists of modeling manufacturing by petri nets, providing as input for the model the initial load of the process and a production plan, running it and obtaining from the simulation the moments of completion of the orders. using the throughput diagram and the funnel formula, we then calculate the mean simulated value of the work-in-process that the plan will produce in the manufacturing system. finally, we discuss how the results can be used to underpin management decisions on issues such as actual work-in-process, buffers and manufacturing constraints.
Embalagens retornáveis para transporte de bens manufaturados: um estudo de caso em logística reversa
Adlmaier, Diogo;Sellitto, Miguel Afonso;
Produ??o , 2007, DOI: 10.1590/S0103-65132007000200014
Abstract: this paper describes a case study in reverse logistics, dealing with returnable packaging, suitable for international transportation of parts required by diesel engines assembly operations. the study refers to cylinder heads, exported from brazil to usa, by sea. the paper begins by revisiting issues in reverse logistics. then describes the case, supported by information gathered by researchers with technical personnel from the firm. beyond the pure facts, the researchers aimed to find out why the firm took such a decision, comparing the exportation process, how it was and how it is now, and the operation of a reverse distribution channel. the text assesses financials, logistics and environmental benefits from the actions, relating critically theory and practice.
Medi??o e controle do tempo de atravessamento em um sistema de manufatura
Sellitto, Miguel Afonso;Walter, Cláudio;
Gest?o & Produ??o , 2008, DOI: 10.1590/S0104-530X2008000100012
Abstract: this paper presents a method for the measurement of the lead-time and work-in-process in manufacturing. the measurement was used in an organizational control process in manufacturing, in which the controlled variate was the order lead-time. this kind of control can be useful in manufacture strategies formulated to compete in tbc (time-based competition). we presented the method, who includes elements from the queuing theory, and concerns about simplifying complex manufacturing arrays, in order to facilitate the analysis. in order to test and refine the method, we studied a case in a footwear manufacture system. we collected data from orders and, by statistical techniques and computational simulation, describe how lead-time behaves, in a stochastic way. as the objective was not reached by the measurement, a managerial diagnosis was made, pointing up undesirable effects that addressed control actions. in order to verify the effectivity of the actions, we had new data collected and the measurement method was again applied. this time, the objective of lead-time was reached, showing that the actions were appropriate. results of the case was analyzed, leading to conclusions and continuities cues.
Constru??o de indicadores para avalia??o de conceitos intangíveis em sistemas produtivos
Sellitto, Miguel Afonso;Ribeiro, José Luis Duarte;
Gest?o & Produ??o , 2004, DOI: 10.1590/S0104-530X2004000100007
Abstract: this paper describes the development and application of a method for developing measurements for intangible values in productive systems. nowadays, mainly in service organizations, intangible values are been used for modeling phenomena, understanding problems, proposing and implementing strategies. from concepts presented in the measurements theory, the philosophy of science and multivariate statistics, an approach for modeling theoretic terms relevant to productive systems is developed. the approach comprises a theoretical mapping of non-manifested variables, definition of constructs, definition of state variables, which can be related to intermediate concepts and supporting manifested variables, which can assume categorical formats, assessed by appropriate techniques like questionnaires. after the definitions, one can represent the focused phenomenon by a path-diagram. if the diagram takes a treelike form, multiple regressions may be used and the mathematical formulation becomes easier. if the diagram takes a systemic form, including circular relationships, a more complex mathematical treatment is required, escaping from the scope of this paper. the proposed approach is illustrated through a case study where the capacity of understanding the lean thinking concept was assessed in fifteen passengers transportation companies from porto alegre, brazil. the results are discussed and suggestions for the continuity of the research are presented.
Medi??o e pré-controle do desempenho de um plano de a??es estratégicas em manufatura
Sellitto, Miguel Afonso;Walter, Cláudio;
Gest?o & Produ??o , 2005, DOI: 10.1590/S0104-530X2005000300013
Abstract: this paper discusses a methodology to measure and precontrol the performance of a strategic manufacturing action plan. a research premise is that the methodology can change measurements as rapidly as modifications in the competitive environment occur, thus keeping the strategy aligned with strategic manufacturing goals. a case study was conducted at a mechanical tools manufacturer to test and refine the method. the company's incremental manufacturing strategy, consisting of six goals and fifteen courses of action, was revamped and a multicriterial approach applied to define indicators and their weights. based on the current performance measured by the indicators, the method assesses each action's potential to contribute toward achieving the objectives. it then goes on to evaluate the gaps between the performance objectives, current performance and the performance expected to result from those actions, subject to investment constraints. this approach allows for modifications of the strategy, enhancing feedforward performance and characterizing the strategic precontrol action. some of the results of this case study are discussed, prompting alternatives for continuity.
Avalia??o do desempenho de uma manufatura de equipamentos eletr?nicos segundo critérios de competi??o
Sellitto, Miguel Afonso;Walter, Cláudio;
Produ??o , 2006, DOI: 10.1590/S0103-65132006000100004
Abstract: this paper reports the performance assessment of a manufacturer firm of electronic equipment in terms of his competitive priorities. the research goal is to propose and test a method for this assessment, beginning with a focus group led by the researcher with the strategic management team of the firm, in which the manufacturing strategy in use was reported as a tree-like structure, weighted with the aid of the ahp. the structure gave rise to a questionnaire, in which the team assessed the actual performance of the strategy as a hole and issue by issue. by comparing the assessed performance with the relative importance of the strategic issues, one can prioritize strategy formulations for the manufacture. for the sake of continuity, one suggests the use of the method for modifications in the existing strategy and for pointing out direct-measured indicators, in addiction to the indirect assessing method now developed.
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