Mathematical modelling
Optimal control strategy on the transmission dynamics of human papillomavirus (HPV) and human immunodeficiency viruses (HIV) coinfection

Eshetu Dadi Gurmu; Boka Kumsa Bole; Purnachandra Rao Koya

Volume 10, Issue 4 , December 2021, , Pages 318-331

https://doi.org/10.22105/riej.2021.294463.1234

Abstract
  In this paper, optimal control theory is applied to Human Papillomavirus (HPV) and Human immunodeficiency viruses (HIV) coinfection model given by using a system of ordinary differential equations. Optimal control strategy was employed to study the effect of combining various intervention strategies ...  Read More

Scheduling
Modeling and Scheduling University Course Timetabling Problems

B. Naderi

Volume 5, 1(4) , November 2016, , Pages 1-15

https://doi.org/10.22105/riej.2017.49167

Abstract
  This paper considers the problem of university course timetabling. In this problem, there are a set of courses, lecturers and classrooms. The objective is to assign schedule courses so as to maximize the total preference of lecturer-course, lecturer-day and course-day. The paper first formulates the ...  Read More

A Novel Discrete Electromagnetism-Like for Fuzzy Open Shop Scheduling Problem with Parallel Machines to Minimize Makespan

A. Jafari; P. Chiniforooshan; F. Mousavinejad; Sh. Shahparvari

Volume 1, Issue 3 , December 2012, , Pages 1-25

Abstract
  In this paper, we consider the fuzzy open shop scheduling problem with parallel machines in each working stage where processing times are vague and are represented by fuzzy numbers. An open shop scheduling problem with parallel machines in each working stage under this condition is close to the real ...  Read More

Designing a Genetic Algorithm to Optimize Fulfilled Orders in Order Picking Planning Problem with Probabilistic Demand

M. Seyedrezaei; S.E. Najafi; A. Aghajani; H. Bagherzadeh Valami

Volume 1, Issue 2 , July 2012, , Pages 40-57

Abstract
  Distribution centers (DCs) play an important key role in supply chain. Delivering the right items to the right customers at the right time, at the right cost is a critical mission of the DCs. Today, customer satisfaction is an important factor for supplier companies in order to gain more profits. Optimizing ...  Read More