Operations Research
A two-stage stochastic programming approach for care providers' shift scheduling problems

Hajar Shirneshan; Ahmad Sadegheih; Hasan Hosseini-Nasab; Mohammd Mehdi Lotfi

Volume 10, Issue 3 , July 2023, , Pages 364-380


  Due to the importance of the health field, the problem of determining the shift scheduling of care providers has been addressed in many studies, and various methods have been proposed to solve it. Considering different skills and contracts for care providers is one of the essential issues in this field. ...  Read More

Operations Research
Routing and scheduling for a home health care problem considering health workers' skills

Elham Samadpour; Rouzbeh Ghousi; Ahmad Makui; Mehdi Heydari

Volume 9, Issue 3 , July 2022, , Pages 249-263


  In Home Health Care (HHC) operations, one of the major aims of HHC centers is to timely meet patients' demands. According to the feedback from HHC centers, their decision-makers deal with some complexity in scheduling and routing of their health workers. Inspired by this point, the present research introduces ...  Read More

Operations Research
A hybrid multi-objective algorithm to solve a cellular manufacturing scheduling problem with human resource allocation

Vahid Razmjooei; Iraj Mahdavi; Selma Gutmen

Volume 9, Issue 2 , June 2022, , Pages 272-287


  A Cellular Manufacturing System (CMS) is a suitable system for the economic manufacture of part families. Scheduling the manufacturing cells plays an effective role in successful implementation of the manufacturing system. Due to the fact that in the CMS, bottleneck machine and human resources are two ...  Read More

Operations Research
A game theory–based model for dental centers in a competitive market of dental tourism under government intervention

Seyed Amin Badri; Negar Yarmohamadi

Volume 9, Issue 1 , March 2022, , Pages 78-94


  The aim of this paper is to propose a mathematical model for two dental centers in a competitive market of dental tourism. Dental tourists are looking for cheaper treatment with proper quality, and dental centers are looking to maximize their profits by providing services to tourists. Government also ...  Read More

Operations Research
Maximum number of parts that can be accurately counted using a weighing scale

Chuck Extrand; Janet Hoskin; Martin Eeg

Volume 8, Issue 3 , September 2021, , Pages 195-208


  Many factors may influence the accuracy of part count by weight, but one of the most ubiquitous and often overlooked causes is part variability. In this work, experiments were performed to quantify the weight variation of injection molded parts and to measure the maximum number of those parts that could ...  Read More

Operations Research
Modeling of the springback in folding using the experimental design method

Walid Meslameni; Chokri Ben Salem

Volume 8, Issue 3 , September 2021, , Pages 290-308


  Bending is one of the most frequently used processes in the sheet metal products industry. The major users are mainly the automotive, aeronautics and electrical engineering industries. It is necessarily a cold forming operation of a flat material, with or without lubricant, obtained notably by exceeding ...  Read More

Operations Research
A new queuing-based mathematical model for hotel capacity planning: a genetic algorithm solution

Saeed Khalili; Masood Mosadegh Khah

Volume 7, Issue 3 , September 2020, , Pages 203-220


  This study presents a new mathematical optimization model using queuing theory to determine the hotel capacity in an optimal manner. For this purpose, a Knapsack model based on the queuing theory is proposed. In this regard, after simulating a hotel's reception system with the help of queuing models ...  Read More

Operations Research
A Designed Electro-flotation Cell for Dye Removal from Wastewater

Fouad El-Hosiny; Mohamed Abdeldayem AbdelKhalek; Khaled Selim; Inge Osama

Volume 4, Issue 2 , October 2017, , Pages 133-147


  An Electro-flotation cell was designed for industrial wastewater treatment. The affecting parameters of the Electro-flotation process such as, pH, initial dye concentration, temperature, current density, current type, ionic strength, stirring speed and number, connection and inter-distance of electrodes ...  Read More

Fuzzy optimization
Shortest Path Problem in Network with Type-2 Triangular Fuzzy Arc Length

Ranjan Kumar; Sripati Jha; Ramayan Singh

Volume 4, Issue 1 , September 2017, , Pages 1-7


  In traditional shortest path problem it is always determined that the parameters (Time, Cost and Distance etc.) are fixed between different nodes. But in real life situations where uncertain parameters exist, parameters are considered as fuzzy numbers. In this paper, we  explained the application ...  Read More