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The product-mold-machine manufacturing problem

IFAC-PapersOnLine 2022年第10期55卷 866-871页

作者： Nelson Troncoso Héctor Cancela Pedro Piñeyro Franco Quezada Óscar C. Vásquez University of Santiago of Chile (USACH) Faculty of Engineering Program for the Development of Sustainable Production Systems (PDSPS) Chile University of Santiago of Chile (USACH) Faculty of Engineering Industrial Engineering Department Chile Departamento de Investigación Operativa Instituto de Computación (InCo) Facultad de Ingeniería Universidad de la República Uruguay

This paper introduces the product-mold-machine manufacturing problem, which is related to the manufacturing process of tires, plastics, ceramics, and glass. Each product has its own shape and mechanical properties obtained from processing a specific mold on a machine. Each machine can process a set of molds at the same time and, hence, the processing time on a machine depends on the longest processing time among the set of molds on the machine. The objective is to find a production plan that minimizes the total number of periods needed to meet the demand of each product, considering a limited number of machines, molds, changeover times, and incompatibilities constraints. We provide a mixed integer linear programming model for the problem and propose two constructive heuristics of polynomial-time, which provide upper bounds on the optimal value and easy-to-implement feasible solutions. Numerical experiments carried out over instances based on real data show the effectiveness of the proposed approaches.

关键词： Scheduling Lot-sizing Makespan Combinatorial Optimization Heuristics

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Drivers of the World Tourism: A Regional View

SSRN

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SSRN 2023年

作者： Ventura, Rodrigo V. Fernandes, Elton Cabo, Manoela de Mello Carvalho, Carla F. Fernandes, Vicente Aprigliano COPPE Production Engineering Program UFRJ Federal University of Rio de Janeiro Rio de Janeiro Brazil COPPE Transportation Engineering Program UFRJ Federal University of Rio de Janeiro Rio de Janeiro Brazil IBGE Brazilian Institute of Geography and Statistics Rio de Janeiro Brazil Escuela de Ingeniería de Construcción y Transporte Pontificia Universidad Católica de Valparaíso Chile

The commercial air transport innovation and its technological evolution, especially after the Second World War, are fundamental factors in the people's movement growth between the nations of the planet. Advances in air transport and income growth have allowed more and more people to realise the dream of getting to know and interacting with cultures from other countries, most times very far from their places of residence. Many studies examine the travel demand evolution more broadly or specifically between locations, which we can characterise as tourist demand. The quest to understand the drivers that move people between different destinations on the planet is a fundamental element of the company's planning and for the public policies formulation. This study contributes to this sense, analysing three socioeconomic factors of the world reality: globalisation, the countries’ economic structure and this structure's dynamics. Using panel data regression analysis methodology and the World Bank's world development indicators, relationships between the international tourism evolution and the mentioned socioeconomic factors are estimated and discussed. Each of the three perspectives analysed shows a strong relationship with the historical demand for tourism. The globalisation indicator revealed a growing positive impact on the level of tourist movement. The country's economic structure indicator showed a significant difference between countries, which suggests the need to examine tourism according to regions concept. Among dynamics indicators, income was the major factor in the tourism indicators variation. © 2023, The Authors. All rights reserved.

关键词： Regression analysis

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Georeferencing System for Maneuvering of Autonomous Truck in Mining Environment

Georeferencing System for Maneuvering of Autonomous Truck in...

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International Carpathian Control Conference (ICCC)

作者： Emanuel Francisco Vicentini Carvalho Lucas Silva De Oliveira Murillo Ferreira Dos Santos Paolo Mercorelli Matheus Carvalho Gouveia Master Degree Program in Automation and Systems CEFET-MG Leopoldina Brazil Department of Mechatronics Engineering CEFET-MG Divinópolis MG Brazil Department of Electroelectronics CEFET-MG Leopoldina Brazil Institute for Production Technology and Systems (IPTS) Leuphana University of Lüneburg Lüneburg Germany Electrical Engineering B. Sc UFJF-MG Juiz de Fora MG Brazil

ISBN: (数字)9798350350708

ISBN: (纸本)9798350350715

Mining automation began in the 1960s to increase safety in underground mines. Today, robotic and autonomous systems perform specific mining activities, creating new oppor-tunities and a more efficient and safe industry. This paper proposes a novel solution for instrumentation for autonomous trucks working in open-pit mines, specifically during the parking maneuver to load ore. In this case, new hardware and firmware are developed to compute the future coordinates of the excavator bucket using two Global Positioning Systems (GPS) receivers. In this approach, employing the concept of geometry and information from the GPS receivers, the future coordinates of the excavator bucket are calculated and made available to control the system, parking the autonomous truck in the desired position. The results demonstrate the accurate positioning of the off-highway truck during the ore-loading process, allowing for the correct execution of the truck's autonomous positioning maneuver.

关键词： Automation Receivers Excavation Hardware Real-time systems Safety Vehicle dynamics

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A Short Review on Oil Palm Biomass as Feedstock for Pyrolysis Process 2nd

A Short Review on Oil Palm Biomass as Feedstock for Pyrolysi...

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2nd International Conference on Recent Advances in Mechanical engineering, RAME 2020

作者： Shrivastava, Pranshu Kumar, Anil Palamanit, Arkom Energy Technology Program Faculty of Engineering Prince of Songkla University 15 Karnjanavanich Rd. Hat Yai Songkhla90110 Thailand Department of Mechanical Production & Industrial and Automobile Engineering Delhi Technological University Shahbad Daulatpur Delhi110042 India Centre for Energy and Environment Delhi Technological University Shahbad Daulatpur Delhi110042 India Energy Technology Program Department of Specialized Engineering Faculty of Engineering Prince of Songkla University 15 Karnjanavanich Rd. Hat Yai Songkhla90110 Thailand

ISBN: (纸本)9789811596773

Oil palm biomass is one of the potential biomasses to produce biofuels and several value-added products because of its favorable physicochemical characteristics and its abundance in the Southeast Asia particularly. This paper presents an overview of oil palm biomass as a feedstock for pyrolysis process. The primary characteristics of oil palm biomass based on chemical composition, ultimate analysis, and proximate analysis including the recent developments in thermochemical conversion technologies for value-added products from slow pyrolysis and fast pyrolysis are briefly explained. The properties of bioproducts like bio-oil and biochar in terms of fuel properties in comparison with petroleum fuel are also mentioned. The future prospects along with the major challenges for the usage of oil palm biomass as a potential biomass for bioproducts production are also mentioned. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Biomass Bioproducts Oil palm biomass Pyrolysis

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The strategies of private higher educational institutions during the Covid-19 pandemic. A review of literature

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Social Sciences and Humanities Open 2023年第1期8卷 100581页

作者： do Lago, Mauricio Maynard Fernandes, Elton Barboza, Raphael Cunha COPPE Production Engineering Program UFRJ Federal University of Rio de Janeiro Rio de Janeiro Brazil COPPE Transportation Engineering Program UFRJ Federal University of Rio de Janeiro Rio de Janeiro Brazil Cefet-RJ – Centro Federal de Educação Tecnológica Celso Suckow da Fonseca Rio de Janeiro Brazil

This paper sought a qualitative/quantitative bibliometric approach, using the literature review, to present the main strategies with a bias toward sustainability, used by private Higher Education Institutions, in an attempt to neutralize the effects of the lockdown caused by the Covid-19 pandemic. To meet the reliability requirements of the source of the papers used, a search was made in the Web of Science and Scopus databases, where 47 papers were selected. As a result, there was a scattering of strategic actions in several works. However, no actions were identified that orientated to deliberate planning, as a way of confrontation with the new environment that was quickly established, caused by the Covid-19 pandemic. Instead, we found fragmented or emerging strategic actions, mostly concentrated on Teaching activities as a possible response, given the circumstances, to a situation that presented itself as an emergency. This study divides the actions identified in the strategic areas of the Institutions into Teaching, Research, Extension, Business Management, and Teacher Training. © 2023

关键词： Covid-19 Private university Strategy Sustainable management

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Vitrification of hazardous wastes from ship recycling: circular economy solutions for asbestos and synthetic vitreous fibers

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Environmental Science and Pollution Research 2025年第13期32卷 8183-8200页

作者： Pereira, Newton Narciso de Castro Bertagnolli, Denise da Silva, Ladário Faria, Eliel Eleutério Junior, José Mauro Moraes de Araujo de Monteiro Barros, Munique Eva Paiva Miranda, Tainara Alves de Oliveira Lima, Eduardo da Silva Almeida, Vitor Duarte Department of Production Engineering School of Industrial Engineering and Metallurgy at Volta Redonda - EEIMVR – Federal Fluminense University UFF Av. dos Trabalhadores 420 – Sala C77 Vila Sta. Cecília RJ Volta Redonda27255-125 Brazil Department of Chemistry Exact Sciences Institute Federal Fluminense University UFF Rua Desembargador Ellis Hermydio Figueira 783 RJ AterradoVolta Redonda27213-145 Brazil Department of Physics Exact Sciences Institute Federal Fluminense University UFF Rua Desembargador Ellis Hermydio Figueira 783 RJ AterradoVolta Redonda27213-145 Brazil Department of Physics Universidade Federal de Roraima Av. Cap. Ene Garcez N. 2413 Paricarana Roraima Boa Vista69310-000 Brazil Departament of Metallurgical Engineering Federal Fluminense University UFF Av. dos Trabalhadores 420 Vila Sta. Cecília RJ Volta Redonda27255-125 Brazil Physics Post-Graduate Program Brazilian Center for Physics Research Rua Doutor Xavier Sigaud 150 Urca RJ Rio de Janeiro22290-180 Brazil Physics Post-Graduate Program Physics Institute Federal Fluminense University UFF Av. Gal. Milton Tavares de Souza S/nº Praia Vermelha Campus RJ Niterói24210-346 Brazil

Ship recycling at the end of its useful life presents significant environmental and health challenges due to the presence of hazardous materials, such as asbestos and synthetic vitreous fibers (SVFs). This study aimed to convert SVFs and asbestos into safe, reusable co-products by incorporating them into a glassy matrix. The materials were melted at 1200 °C for 1 h with utilization of niobium pentoxide (Nb2O5) to lower fusion temperatures. Samples collected from an offshore vessel and platform being recycled in Rio de Janeiro, Brazil, were analyzed using energy-dispersive x-ray spectroscopy (EDS) and scanning electron microscopy (SEM), revealing the presence of SVFs but not asbestos. Seven types of glass were produced, with their non-crystalline, glassy nature confirmed by the presence of an amorphous halo in X-ray diffraction (XRD) and a glass transition observed in differential scanning calorimetry (DSC). These findings demonstrate the potential to transform hazardous waste into value-added products, advancing a circular economy in ship recycling operations. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Asbestos

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Exploring barriers to ICT adoption in road freight operations

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Procedia Computer Science 2025年 253卷 1702-1711页

作者： Mario Henrique Callefi Sara Yumi Shiramizu Luiz Antonio de Carvalho Matthias Thürer Syntia Lemos Cotrim Lucas Daniel Del Rosso Calache Chair of Factory Planning and Intralogistics Chemnitz University of Technology 09125 Chemnitz Germany Department of Textile Engineering State University of Maringá Avenue Reitor Zeferino Vaz S/n Goioerê 87360-000 Brazil Post graduation program in Production Engineering State University of Maringá Avenue Colombo 5790 Maringá 87020-900 Brazil Sao Paulo State University (Unesp) School of Engineering Campus of Sao Joao da Boa Vista Av. Profa. Isette Corrèa Fontão 505 São João da Boa Vista 13876-750 Brazil

This study investigates barriers to adopting Information and Communication Technology (ICT) in road freight transportation, a sector where operational efficiency is crucial. A mixed-method approach comprising a Systematic Literature Review, the Fuzzy Delphi Method, and the Best and Worst Method was employed to evaluate these barriers. Five main obstacles were identified: lack of top management and investor support, resistance to change, absence of economic and political incentives, uncertainties regarding return on investment, and high technology investment costs. The most significant barrier was the lack of top management support, which influenced investment and strategic decisions. Theoretically, the research enhances understanding of technology adoption barriers in road freight transportation, providing insights for future academic and practical applications. From a managerial point of view, this study offers insights to improve ICT adoption strategies, thereby boosting sector efficiency and competitiveness.

关键词： ICT adoption barriers Road freight transportation Multi-criteria decision making

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Fast-Track 24-Hour UPA: Analysis of opportunities and continuous improvements through IRAMUTEQ

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IFAC-PapersOnLine 2022年第10期55卷 221-226页

作者： SMA Chaves R.D Calado S. C Bourguignon L.E.V Viera J.R.S Ramos L.E.M Rodrigues A.D Saldanha O.O. Braga Neto Postgraduate Program in Science and Biotechnology Institute of Biology Fluminense Federal University Niterói Brazil Production Engineering Department. Federal Fluminense University Volta Redonda Brazil Institute of Biology Fluminense Federal University Niterói Brazil Production Engineering Department. Federal Fluminense University Rio das Ostras Brazil Postgraduate Program in Sciences Technologies and Inclusion (PGCTIn) Fluminense Federal University Niterói Brazil Department of Nursing Fluminense Federal University Rio das Ostras Brazil DAHU/ Ministry of Health Brazil Brazil DAHU/ Ministry of Health Brazil

Overcrowded public emergency services are global issues and their serious healthcare problems are widely discussed in literature. Therefore, there are high rates of morbidity and mortality due to lack of specialized care, especially regarding low-acuity patients identified as those responsible for overcrowded services in scientific literature. Thus, a Lean Healthcare approach was developed in order to understand Fast Track applications in Emergency Care Units (UPA 24H) through a descriptive qualitative research using a statistical data analysis software called IRAMUTEQ, which processes data obtained from technical reports prepared during the Lean Project at 24-Hour UPA..

关键词： Lean Healthcare Fast Track UPA 24 H Emergency Departments IRAMUTEQ

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Overall Equipment Effectiveness: Required but not Enough—An Analysis Integrating Overall Equipment Effect and Data Envelopment Analysis

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Global Journal of Flexible Systems Management 2020年第2期21卷 191-206页

作者： Piran, Fabio Antonio Sartori De Paris, Alaércio Lacerda, Daniel Pacheco Camargo, Luis Felipe Riehs Serrano, Rosiane Cassel, Ricardo Augusto Production and System Engineering Graduate Program Universidade Do Vale Do Rio Dos Sinos São Leopoldo RS Brazil Federal Institute of Education Science and Technology of Rio Grande Do Sul- Campus Erechim Erechim RS Brazil Production Engineering Graduate Program Universidade Federal Do Rio Grande Do Sul Porto Alegre RS Brazil

The efficiency levels at which companies turn inputs into outputs may increase their competitive capacity. Nevertheless, in the literature, there is a lack of methods allowing evaluation of the performance of operations in production systems that take into account all of their components. The objective of this study is to present an analysis of efficiency for a production system using DEA and OEE in an integrated manner (DEA/OEE). To achieve this objective, we conducted a case study of a bus manufacturer and a comparative analysis using the results obtained by DEA/OEE compared with the results of the OEE measured in an operation of the company studied. The efficiency measured by DEA/OEE presents differences in relation to OEE results. The analysis of the causes of such differences pointed out that action taken to improve the OEE indicator decreased the efficiency of the operation analyzed. This study evidences that decision-making focused on improving OEE on its own may lead to an increase in the consumption of resources during an operation. Such an increase does not necessarily increase production levels and may reduce technical efficiency. © 2020, Global Institute of Flexible Systems Management.

关键词： Data envelopment analysis Operational performance evaluation Overall equipment effectiveness Performance measurement

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Queuing Theory: Contributions and Applications in the Field of Health Service Management – A Bibliometric Approach

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IFAC-PapersOnLine 2022年第10期55卷 210-214页

作者： A.B. Santos R.D. Calado A.C.S. Zeferino S.C. Bourguignon Postgraduate Program in Science and Biotechnology Institute of Biology Fluminense Federal University Niterói Brazil Production Engineering Department. Fluminense Federal University Volta Redonda Brazil Institute of Biology Fluminense Federal University Niterói Brazil

This article aims to analyze contributions and applications of Queuing Theory (QT) in solving health service management problems. A literature bibliometric review was carried out to present a chronological classification of health care systems examined with the aid of queuing models with the purpose of describing the main trends in QT application to assist decision makers in health services. Methodology: A bibliometric review was carried out to investigate the area of health supported by queuing models. Articles describing models of problems were sought and their topics or keywords related to QT and health care or health problems of the population. Results: 314 articles addressing the applications of QT in Health Care Management (HCM) from 2014 and 2020 were analyzed. Conclusion: It was found that QT contributes to improve health services and provides managers with resources to achieve such improvement. It was also evidenced that it is widely applied in emergency services.

关键词： Queue Theory Simulation Bibliometric Review Fast Track Lean Healthcare

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