Mestrado em Engenharia de Produção

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https://repositorio.ufcat.edu.br/handle/tede/84

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Navegando Mestrado em Engenharia de Produção por Autor "Bachega, Stella Jacyszyn"

Agora exibindo 1 - 5 de 5
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    Modelos de programação linear inteira para variantes do problema de programação de projetos com restrição de recursos
    (Universidade Federal de Goiás, 2018-11-23) Melo, Luciana Vieira de; Queiroz, Thiago Alves de; http://lattes.cnpq.br/8041183668335400; Queiroz, Thiago Alves de; Mundim, Leandro Resende; Bachega, Stella Jacyszyn
    The resource-constrained project scheduling problem has its importance both in the theoretical part, as in the field of operational research, and in practice, with project management in corporate environments and other applications. In this context, some integer linear programming models, solved with the help of an optimization library, were studied for the resource-constrained project scheduling problem. This problem aims at minimizing the makespan, namely, the total completion time of the project, given the scheduling of activities. In order to achieve this objective, a quantitative approach is used, and the research is classified as descriptive with regard to its objective, and bibliographical and experimental with regard to the technical procedures used. The first model has two types of decision variables, while in the second model there is only one type of variable. When considering the insertion of real constraints, in particular, the multi-skill, the multi-mode and time lags, the third, fourth and fifth models are obtained, respectively, from the second model with the addition of such constraints. The models are analyzed with regard to the runtime and the amount of instances solved in optimality. The results of the computational experiments indicate that the second model is a bit more competitive in comparison with the first one, since it was able to solve a larger number of instances, present solutions with a smaller gap and require less computational time. Therefore, the other models started from the second with the addition of practical constraints. The results of the computational experiments indicate that the models with practical constraints can have better performance (that is, related to the number of instances solved, gap value and computational time) when smaller instances are considered. Therefore, developing models that are capable of solving medium and large size instances is a challenge, but, it can bring great advantages for the corporate environment, helping managers in making decisions, reducing waste, improving costs and thus bringing personal well-being.
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    Proposta de melhoria da gestão hospitalar com uso da lean healthcare
    (2021-09-28) Cechin, Débora Paula Borges De Oliveira; Bachega, Stella Jacyszyn; Tavares, Dalton Matsuo; Fernandes, Nilson José; Queiroz José Antonio de,
    Evidências e pesquisas demonstram a necessidade de mudanças no setor de saúde, caracterizando os desafios enfrentados na gestão hospitalar. Aplicações do lean, conhecido como Lean Healthcare, vêm ocorrendo em diversas partes do mundo e inúmeros têm sido seus resultados. Apesar das melhorias que a Lean Healthcare tem proporcionado, pouco tem sido a percepção dos benefícios gerados aos olhos dos clientes. Além disso, nota-se que há um grande interesse em relação a integração da Lean Healthcare com outras técnicas. Assim, para contribuir com a melhoria da perspectiva de valor aos olhos dos clientes e integração da Lean Healthcare com outras técnicas, o presente trabalho tem o objetivo de propor o uso de ferramentas afins a Lean Healthcare para melhoria de processos na gestão de um hospital. Ressalta-se que o foco da melhoria é a redução do lead time do processo. Para isso, foi realizada uma pesquisa aplicada, por meio de uma abordagem qualitativa, com a realização de uma pesquisa bibliográfica e um estudo de caso no setor de exames de imagem de um hospital. As principais técnicas da Lean Healthcare utilizadas no estudo foram o mapeamento do fluxo de valor e a análise dos sete desperdícios, que em conjunto com uma pesquisa aplicada aos clientes do hospital de estudo e a revisão teórica foi construída uma proposta de melhoria. Dentre as melhorias que foram geradas a partir da aplicabilidade da proposta estão a redução do lead time em 22,95%, do tempo de espera em aproximadamente 22,97%, do deslocamento tanto aos clientes quanto dos colaboradores em 13,18%, a diminuição de desperdícios que impactarão diretamente na melhoria da qualidade no atendimento, menor tempo de exposição no ambiente hospitalar e maior satisfação na entrega dos serviços de saúde. Desse modo, o estudo pode contribuir no desenvolvimento científico da área de Lean Healthcare, com propostas para uma melhora nos processos do setor de exames de imagem, maior identificação e definição de valor aos olhos dos clientes e a contribuição para a comunidade acadêmica referente a pesquisas que utilizem ferramentas da Lean Healthcare em conjunto com outras técnicas. Ademais, a pesquisa contribuiu também para que outras instituições de saúde possam enxergar alguns obstáculos referentes ao setor de exames de imagem e apresenta a proposta da inclusão de um sistema (app) para contribuir com a agilidade do processo do agendamento até o resultado do exame, com o foco na diminuição do tempo de espera do paciente.
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    Proposta de processo para desenvolvimento de um centro de descarte e reuso de lixo eletrônico na Universidade Federal de Goiás
    (Universidade Federal de Goiás, 2020-03-10) Silva, Edvaldo Capingote Serafim da; Tavares, Dalton Matsuo; http://lattes.cnpq.br/2307520004470578; Bachega, Stella Jacyszyn; http://lattes.cnpq.br/6057931770645811; Fernandes, Nilson José; Paula, Heber Martins de; Bachega, Stella Jacyszyn
    In an attempt to promote awareness of the destination of electronic waste in universities, it is necessary to adopt sustainable practices that can achieve social, economic and environmental benefits. It has to be said that activities such as recycling or even reusing electronic waste (Green IT actions) considered outdated or useless in IEs, can be an important initiative to reduce the need for raw materials and, thus, contribute positively to reducing pollution in the planet. From this approach, the research problem is defined: how to implement an electronic waste disposal and reuse center in a university? To guide the execution of the study, the hypothesis formulated for the research problem is: a disposal and reuse center ensures that electronic waste is not dispersed in university departments. Thus, the general objective is to propose a center for the disposal and reuse of electronic waste at a university. The specific objectives contribute: in the analysis of legislation (environmental and patrimonial) aimed at the disposal of electronic waste, in public institutions; identification of forms / models for the development of electronic waste disposal and reuse centers; and, development of a scenario for the disposal and reuse of electronic waste in a university via simulation. For this, the literature review was performed with the aid of the CiteSpace® software, using the Web of Science and Scopus databases. The sampling technique was used to find the number of disassembly timings for computer equipment, in order to compose some parameters needed in the simulation. It is also noteworthy that semi-structured scripts were applied in areas of interest, such as CEDIR-USP and UFG bodies, such as CERCOMP and DPAME. It is concluded that the execution of the project stimulates sustainable development, as well as local remanufacturing, recycling or reuse; the increase in the rates of waste collection and the pioneering nature of the disposal of material in a higher education institution in the state of Goiás.
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    Proposta de uso de simulação computacional para incorporação de conceitos e atividades de green it em uma universidade
    (Universidade Federal de Goiás, 2019-03-15) Marques, Carulina; Bachega, Stella Jacyszyn; http://lattes.cnpq.br/6057931770645811; Bachega, Stella Jacyszyn; Fernandes, Nilson José; Tavares, Dalton Matsuo
    The concept of Green IT refers to sustainable technologies and information systems, as well as environmentally correct practices in the field of Information Technology. Universities, which have the role of propagating and applying knowledge, play an important role as disseminators of ideas related to Green IT. Therefore, it is necessary to study ways to achieve sustainable measures in these educational institutions. Based on this assumption, the main objective of the present research is to evaluate, through computer simulation, the environmental impact of a university's computer laboratories in terms of energy consumption and CO2 emission. Through these metrics, it was possible to calculate the value of the eco-efficiency indicator. A review of the literature on the integrated approach of green it and sustainable university themes was also carried out. The method of analysis of cocitations in multiple perspectives was used, which allowed the evaluation of which authors are most frequent in research on the themes , most commonly used keywords, and which topics are best covered when themes are studied together. The novelty is that the integration of the concepts of Sustainable University and Green IT have not yet been approached together in the Campus that will be the target of the research. Therefore the results generated with the research are of importance for the scientific development of the university. The results obtained by joining these approaches will contribute to the achievement of some approaches to sustainable universities, and may be used by national and international universities. In addition, it becomes possible to strengthen scientific researches that have interdisciplinary / transversal traits.
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    Sistema de Gerenciamento Ambiental (SGA): uma proposta para instituições de Ensino Superior (IES)
    (Universidade Federal de Goiás, 2019-03-11) Silva, Lays Capingote Serafim da; Bachega, Stella Jacyszyn; http://lattes.cnpq.br/6057931770645811; Bachega, Stella Jacyszyn; Espinosa, José Waldo Martínez; Paiva, Ed Carlo Rosa
    Environmental problems are a concern of all organizations, including Higher Education Institutions (HEIs). In addition to the responsibility to disseminate technical knowledge, they should educate students to have public awareness about sustainability, as well as being examples within their university campuses, developing actions to reduce and control the environmental impacts generated by them. This dissertation deals with the first strategy of this approach, with the general objective of proposing an EMS model directed to HEI and considering environmental practices in the areas of teaching, research and extension, with a view to the continuous improvement and quality of life of the academic community. The SGA is defended in the literature as a successful tool for HEIs, for managing environmental problems and benefiting campus sustainability. Thus, in order to comply with the general objective, SGA models for HEI were identified in the literature to analyze the structure employed and the practices performed. ANBT NBR ISO 14001: 2015 was the reference that this study is oriented towards the elaboration of the EMS model, so the structure, as well as the procedures and orientations of the norm are used in this proposal. The indicators for the evaluation of environmental performance in the EMS, as well as actions in the scope of teaching, research and extension were obtained through the analysis of important studies in the area of environmental management. As for methodological procedures, the scientific explanation is hypothetical - deductive, since a proposition is analyzed; the research approach is qualitative; the research procedure is the theoretical-conceptual and content analysis was the technique of data analysis. A theoretical framework was used that represents the steps performed for the construction of the proposed model. The main results were: (a) the finding that ISO 14001 is the most used standard, but there are many difficulties for its implementation in Brazil, having only one Brazilian university with the implementation and certification, (b) identifying the relevance of this study (c) the differentials of the proposed model in comparison to the other EMS models, highlighting the particularities in the structure, guidelines for implementation, examples of effective practices for each stage, proposition of three groups of indicators, one of them being the Balanced Scorecard (BSC), in addition to the quality tools that are indicated in some stages of the model. Also, this work promotes contributions in the academic and business fields, insofar as it proposes a model of environmental management system that uses ISO 14001 as a reference; presents a bibliographical research on themes related to sustainability and enables the dissemination and understanding of the responsibilities of HEIs, as well as their role as environmental educators and agents of transformation.