Pesquisa Operacional最新文献

BI-LEVEL MODEL: NEW APPROACH TO DYNAMIC VEHICLE ALLOCATION IN SUPPLY CHAIN 双层模型:供应链车辆动态分配的新方法

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00266695

J. Neves, S. F. Lucas, Gisele Campos Neves, J. Weissmann

引用次数: 0

GLOBAL PERFORMANCE EVALUATION BASED ON MULTIVARIABLE STATISTICAL CONTROL OF A PUBLIC UTILITY COMPANY 基于多变量统计控制的公用事业公司全局绩效评价

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00270103

Ana Gabriela Banquez Maturana, T. Herrera

引用次数: 0

PERFORMANCE ANALYSIS OF A BRAZILIAN CALL CENTER WITH IMPATIENT CUSTOMERS USING M/Gc/1+G AND M/G/c+G QUEUING MODELS 使用M/Gc/1+G和M/G/c+G排队模型对巴西呼叫中心不耐烦客户的绩效分析

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00271290

Sidney Carlos Ferrari, R. Morabito

{"title":"PERFORMANCE ANALYSIS OF A BRAZILIAN CALL CENTER WITH IMPATIENT CUSTOMERS USING M/Gc/1+G AND M/G/c+G QUEUING MODELS","authors":"Sidney Carlos Ferrari, R. Morabito","doi":"10.1590/0101-7438.2023.043.00271290","DOIUrl":"https://doi.org/10.1590/0101-7438.2023.043.00271290","url":null,"abstract":". This study analyzes performance measures in a Call Center with impatient customers, who may leave the system before being served. The abandonment of the waiting line is a measure of the subjective perception of the quality of the services offered, being one of the main concerns of the managers of Call Center systems. Based on data extracted from the case study of a Brazilian company, it is shown that the analytical queuing models M/G c /1+G and M/G/ c +G, with generic distributions to represent service times and generic distributions (particularly mixed distributions) to represent patience times, can be effective to evaluate the congestion problem of this Call Center. The sampling performance measures of this case are compared with the measurements obtained through the M/G c /1+G and M/G/ c +G models, using non-mixed and mixed distributions based on Exponential, Fatigue Life and Normal distributions to represent customers’ patience. We are not aware of other studies in the literature in this line of research. The results indicate that, in general, the use of analytical queuing models with abandonment, exploring more elaborate distributions to model service times and mixed distributions for patience times, are more accurate in evaluating this Call Center than other queuing models with abandonment, such as the M/M/ c +M, M/M/ c +G and M/G/ c +M.","PeriodicalId":35341,"journal":{"name":"Pesquisa Operacional","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67470367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FUZZY-BASED DECISION SUPPORT SYSTEM FOR PRIVATE BANKING 基于模糊的私人银行决策支持系统

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00264857

Drance Meira de Oliveira Filho, Adiel Teixeira de Almeida Filho, Luciano Ferreira, M. Righi, D. Borenstein

{"title":"FUZZY-BASED DECISION SUPPORT SYSTEM FOR PRIVATE BANKING","authors":"Drance Meira de Oliveira Filho, Adiel Teixeira de Almeida Filho, Luciano Ferreira, M. Righi, D. Borenstein","doi":"10.1590/0101-7438.2023.043.00264857","DOIUrl":"https://doi.org/10.1590/0101-7438.2023.043.00264857","url":null,"abstract":". Private banking is one of the most profitable services offered by financial institutions in Brazil. In this service, a client should consider the suitability of a range of banking product, during his or her life based on dynamic objectives. It is a very complex service that involves regulation from governmental agencies, financial institutions’ interests, and clients’ objectives. It is not uncommon for these aspects to be conflicting, hindering the decision-making process and leading to unwanted decisions. This paper describes the development of a decision support system (DSS) for private banking, called OptPri-vate, that integrates the suitability assessment with the portfolio selection, enabling the investor to choose a portfolio based on several and conflicting objectives. The DSS considers the investment selection problem in two interconnected subproblems: suitability and capital allocation. In the former, the DSS is based on an integrated modeling approach that considers legal aspects and investors’ preferences throughout a fuzzy multiple-attribute decision-making approach (MADM), called FTOPSIS-Class. In the latter, a fuzzy multi-objective optimization model uses the sorting results from the previous step to define a portfolio, simultaneously considering risk, return, and the investor’s profile. To facilitate the DSS application, linguistic variables are used in several aspects of the decision-making process, including risk exposure. The DSS was validated using field tests at a well-respected private bank in Brazil. The DSS recommends more suitable portfolios, in line with the investor’s profile, with greater profitability and less volatility than those recommended by the financial analysts for all test cases.","PeriodicalId":35341,"journal":{"name":"Pesquisa Operacional","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67469846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

STUDY FOR DECENTRALIZATION OF NAVAL POWER IN THE BRAZILIAN NAVY: STRUCTURING AND MATHEMATICAL MODELING IN THE LIGHT OF THE ELECTRE-MOR METHOD 巴西海军权力下放研究:基于电-多方法的结构与数学建模

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00263808

Igor Pinheiro de Araújo Costa, Isaque David Pereira de Almeida, M. Moreira, A. Terra, Sérgio Mitihiro do Nascimento Maêda, C. F. Gomes, M. Santos

{"title":"STUDY FOR DECENTRALIZATION OF NAVAL POWER IN THE BRAZILIAN NAVY: STRUCTURING AND MATHEMATICAL MODELING IN THE LIGHT OF THE ELECTRE-MOR METHOD","authors":"Igor Pinheiro de Araújo Costa, Isaque David Pereira de Almeida, M. Moreira, A. Terra, Sérgio Mitihiro do Nascimento Maêda, C. F. Gomes, M. Santos","doi":"10.1590/0101-7438.2023.043.00263808","DOIUrl":"https://doi.org/10.1590/0101-7438.2023.043.00263808","url":null,"abstract":". The Brazilian Navy (BN) has its combatant force concentrated in an area with only one exit to the sea. Nevertheless, Brazil has an extensive coast that needs to be patrolled and, in case of any kind of conflict, the BN must be able to defend the sovereignty and interests of the country. For this purpose, a robust and decentralized naval force is necessary, which allows the fulfillment of its mission. This paper aims to classify the most suitable cities in Brazil to be established as naval bases by applying the ELECTRE-MOr hybrid method. Seventeen cities were analyzed, which have an opening to the sea and a pre-existing minimum port structure. The alternatives were evaluated by specialists from the BN, with more than twenty years of active service, in the light of operational, economic and strategic criteria. As a result, five alternatives were classified as the most indicated headquarters for the decentralization of the naval power: Bel´em/PA, S˜ao Luis/MA, Fortaleza/CE, Recife/PE and Aratu/BA. This article presents relevance to academia and society, as it represents the application of a method in the state of the art to support the decision-making process in a significant problem for the sovereignty of Brazil, presenting a methodology that can be applied in issues of tactical, operational, strategic and political levels.","PeriodicalId":35341,"journal":{"name":"Pesquisa Operacional","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67469838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A NEW MODELLING FOR THE AIRCRAFT LANDING PROBLEM AND MATHEURISTIC APPROACH TO SOLVE THE PROBLEM WITH A LARGE NUMBER OF AIRCRAFT 提出了一种新的飞机降落问题的建模方法，并给出了求解飞机降落问题的数学方法

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00266290

Lorrany Cristina da Silva, Fernanda Yuka Ueno, M. Santos, A. Carvalho

{"title":"A NEW MODELLING FOR THE AIRCRAFT LANDING PROBLEM AND MATHEURISTIC APPROACH TO SOLVE THE PROBLEM WITH A LARGE NUMBER OF AIRCRAFT","authors":"Lorrany Cristina da Silva, Fernanda Yuka Ueno, M. Santos, A. Carvalho","doi":"10.1590/0101-7438.2023.043.00266290","DOIUrl":"https://doi.org/10.1590/0101-7438.2023.043.00266290","url":null,"abstract":". Air traffic management has become increasingly complex due to the increasing use of air transport. One of the main management bottlenecks is planning the efficient use of runways for takeoff and landing. This paper aims to investigate the Aircraft Landing Problem, which seeks to minimize earliness and tardiness in aircraft landing time, assigning them to a runway to land and sequencing them. A new mathematical formulation based on Job Shop was proposed for the problem, comparing it with four mathematical formulations in the literature; three directly comparable and another containing a particularity that does not allow a direct comparison with the other formulations. Computational tests were performed on 49 instances of the literature using the Gurobi Optimizer optimization package. These mathematical formulations commonly used for the ALP present difficulties in finding the optimal solution when the number of aircraft to land is large, i.e., more than 50 aircraft. Therefore, we proposed a matheuristic to solve instances with a greater number of aircraft than the Gurobi Optimizer cannot solve optimally. This matheuristic first finds an initial solution using relax-and-fix (RF) and then fix-and-optimize (FO) improves the found solution. Comparisons were also made using the first feasible solution obtained by Gurobi and then was improved with FO. Among the matheuristic variations, the one that obtained the best result was the combination of RF with FO and this also showed efficiency in relation to the work in the literature that uses FO.","PeriodicalId":35341,"journal":{"name":"Pesquisa Operacional","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67469859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RECOVERY OF A GREEN HOSPITAL SYSTEMS BASED ON ISO 14001: 2015 STANDARDS 恢复基于iso 14001: 2015标准的绿色医院系统

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00265411

Khelood A. Mkalaf, Nedaa Alshaheen, R. Al-Hadeethi, Ammar F. J. Al-Bazi

引用次数: 0

REDISTRIBUTING MULTIPLE INPUTS WITH A PARABOLIC DEA MODEL 用抛物型dea模型重新分配多个输入

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00267995

Luíza Serra Moreira, J. C. Soares de Mello, Lídia Ângulo Meza

引用次数: 0

DECOMMISSIONING OFFSHORE OIL AND GAS PRODUCTION SYSTEMS WITH SMAA-ExpTODIM SMAA-ExpTODIM用于海上油气生产系统的退役

Pesquisa Operacional Pub Date : 2023-08-21 DOI: 10.1590/0101-7438.2023.043.00267436

Yarly Queiroz de Lima, Flavio Autran Monteiro Gomes, A. Leoneti

{"title":"DECOMMISSIONING OFFSHORE OIL AND GAS PRODUCTION SYSTEMS WITH SMAA-ExpTODIM","authors":"Yarly Queiroz de Lima, Flavio Autran Monteiro Gomes, A. Leoneti","doi":"10.1590/0101-7438.2023.043.00267436","DOIUrl":"https://doi.org/10.1590/0101-7438.2023.043.00267436","url":null,"abstract":". This study addresses the application of the Stochastic Multicriteria Acceptability Analysis (SMAA) technique, in combination with the Exponential TODIM method (ExpTODIM), by taking into consideration proposition made by Petrobras to the Brazilian National Agency for Petroleum, regarding the de-commissioning of both Marlim and Voador production fields. The new approach called SMAA-ExpTODIM takes into consideration different perspectives of participants involved in decision making regarding decom-missioning projects and incorporates them to its results. Besides incorporating decision makers’ uncertainties and ignorance zones, this new approach explicitly considers the decision making based on the different perspectives of the Proponent and of the Regulator. The application of the SMAA-ExpTODIM approach increased robustness by adopting different probability functions for stochastic variables, for the process of formulating and modeling the decommissioning issue. This was undertaken to represent profiles associated with aversion or propensity to risks faced by institutional decision makers. For each decision maker profile, different preference structures or comfort levels are created with a choice between decision alternatives.","PeriodicalId":35341,"journal":{"name":"Pesquisa Operacional","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67470399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

OPTIMAL ALLOCATION OF FLEET OF HELICOPTERS AND AIRPORTS TO TRANSPORT PASSENGERS IN OFFSHORE MARITIME UNITS 直升机机队和机场的最佳配置，以运送海上单位的乘客

Pesquisa Operacional Pub Date : 2023-03-13 DOI: 10.1590/0101-7438.2023.043.00263236

Hugo Lustosa Pereira, V. F. Ferreira Filho, Igor Girão Peres Vianna

{"title":"OPTIMAL ALLOCATION OF FLEET OF HELICOPTERS AND AIRPORTS TO TRANSPORT PASSENGERS IN OFFSHORE MARITIME UNITS","authors":"Hugo Lustosa Pereira, V. F. Ferreira Filho, Igor Girão Peres Vianna","doi":"10.1590/0101-7438.2023.043.00263236","DOIUrl":"https://doi.org/10.1590/0101-7438.2023.043.00263236","url":null,"abstract":". The choice and distribution of the optimal fleet mix of helicopters to service the offshore air operation is an important logistical problem that has a potential to reduce costs considered in the oil and gas industry. The variability of helicopter models and sizes, as well as the possible operational restrictions of airport bases and airspace, requires that adequate numerical techniques of Operational Research are applied. In this context, this work develops a model to determine the trajectories and distances traveled between airport bases and offshore maritime units and vice-versa, through an airspace modeled by a directed graph. Also develop a helicopter performance model to obtain the estimated payload and flight times for each specified mission and last but not least an integer linear programming model to allocate an optimal fleet and airport mix for passenger transport through the use of different helicopter sizes. The model was applied to offshore units operating in the Santos basin due to their strategic importance in the oil and gas industry. The results obtained included a map of preferred regions for two different helicopter sizes (large and medium), the weekly flight tables showing the allocation of helicopters and airport for different demand scenarios, additionally the impact of fuel prices on different airport bases and the concentration of movements on air routes are also evaluated in order to complement the analysis.","PeriodicalId":35341,"journal":{"name":"Pesquisa Operacional","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67469794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0