A multi-objective optimization model for multiple project scheduling and multi-skill human resource assignment problem based on learning and forgetting effect and activities' quality level

Milad Hematian; Mirmehdi Seyyedesfahani; Iraj Mahdavi; Nezam Mahdavi Amiri; Javad Rezaeian

Volume 7, Issue 2 , August 2020, , Pages 98-118


  One of the most important aspects of human resource management is the allocation of the workforce to activities. Human resource assignment to project activities for its scheduling is one of the most real and common issues in project management and scheduling. This becomes even more significant when human ...  Read More

Balancing public bicycle sharing system by defining response rates for destinations

Behzad Maleki Vishkaei; Iraj Mahdavi; Nezam Mahdavi Amiri; Esmaile Khorram

Volume 7, Issue 1 , June 2020, , Pages 19-34


  Public Bicycle Sharing System (PBSS) is used as a way to reduce traffic and pollution in cities. Its performance is related to availability of bicycles for picking up and free docks to return them. Existence of different demand types leads to the emergence of imbalanced stations. Here, we try to balance ...  Read More

Three-stage mining metals supply chain coordination and air pollutant emission reduction with revenue sharing contract

Hamed Homaei; Iraj Mahdavi; Ali Tajdin

Volume 7, Issue 1 , June 2020, , Pages 107-123


  One of the main concerns of all industries such as mine industries is to increase their profit and keep their customers through improving quality level of their products; but increasing the quality of products usually releases air pollutants. Nowadays the management of air pollutant emissions with harmful ...  Read More

Simulated annealing and artificial immune system algorithms for cell formation with part family clustering

Iraj Mahdavi; Sara Firouzian; Mohammad Mahdi Paydar; Mahdi Saadat

Volume 7, Issue 1 , June 2020, , Pages 191-219


  Cell formation problem (CFP) is one of the main problems in cellular manufacturing systems. Minimizing exceptional elements and voids is one of the common objectives in the CFP. The purpose of the present study is to propose a new model for cellular manufacturing systems to group parts and machines in ...  Read More

A new approach for solving fuzzy multi-objective quadratic programming of water resource allocation problem

Hadi Nasseri; Abdollah Baghban; Iraj Mahdavi

Volume 6, Issue 2 , December 2019, , Pages 78-102


  This paper describes an application of fuzzy multi-objective quadratic model with flexible constraints for optimal allocation of limited available water resources among different water-user sectors. Due to the fact that, water resource allocation problem is one of the practical and essential subjects ...  Read More

Particle swarm optimization for a bi-objective web-based convergent product networks

R. Hassanzadeh; I. Mahdavi; N. Mahdavi-Amiri

Volume 2, Issue 1 , June 2015, , Pages 41-60

  Here, a collection of base functions and sub-functions configure the nodes of a web-based (digital)network representing functionalities. Each arc in the network is to be assigned as the link between two nodes. The aim is to find an optimal tree of functionalities in the network adding value to the ...  Read More