1. An optimization model for aggregate production planning and control: a genetic algorithm approach

S. M. Ahmed; T. K. Biswas; C. K. Nundy

Volume 8, Issue 3 , Summer 2019, Pages 203-224

http://dx.doi.org/10.22105/riej.2019.192936.1090

Abstract
  In this paper, an optimization model for aggregate planning of multi-product and multi-period production system has been formulated. Due to the involvement of too many stakeholders as well as uncertainties, the aggregate production planning sometimes becomes extremely complex in dealing with all relevant ...  Read More

2. A framework to evaluate and improve supply chain: FAHP based case study on a supermarket

Sh. Haldar; Ch. L. Karmaker; Sk. R. Hossain

Volume 8, Issue 3 , Summer 2019, Pages 225-242

http://dx.doi.org/10.22105/riej.2018.149536.1060

Abstract
  Nowadays, the supply chain has become a buzzword in the business field. Only the supply chain can help to lead a business in an organized way. However, in a supermarket, the supply chain is very important, but it needs to ensure better communication with supplier, customer, and internal management too. ...  Read More

3. An optimization model for cold chain food distribution

A. K. Garside

Volume 8, Issue 3 , Summer 2019, Pages 243-253

http://dx.doi.org/10.22105/riej.2019.202178.1097

Abstract
  Food product has a characteristic of continuous quality deterioration until the food is consumed. Cold chain distribution can improve the sustainability of the product quality but requires a more significant investment for storage facilities and vehicles as well as higher operation cost to control the ...  Read More

4. Calculation of fuzzy matrices determinant

F. Babakordi; N. A. Taghi-Nezhad

Volume 8, Issue 3 , Summer 2019, Pages 254-261

http://dx.doi.org/10.22105/riej.2019.202666.1098

Abstract
  Matrix and its determinant are two basic tools, which are important in financial, accounting, and economic affairs. Therefore, in this paper, a simple and effective method is proposed to obtain the determinant of fuzzy matrices. First, using arithmetic operations based on Transmission Average (TA),the ...  Read More

5. Some fixed point results involving a general LW-type cyclic mapping in complete b-metric-like spaces

S. Q. Weng

Volume 8, Issue 3 , Summer 2019, Pages 262-273

http://dx.doi.org/10.22105/riej.2019.195844.1093

Abstract
  In recent years, the research of the fixed point theorem is a hot topic all the time. In this paper, we propose the notion of new mapping, that is, a general LW-type cyclic mapping, in a complete b-metric-like spaces. Then, we obtain the existence and uniqueness theorem of its fixed point. Moreover, ...  Read More

6. A signed distance method for solving multi-objective transportation problems in fuzzy environment

H. Abd El-Wahed Khalifa

Volume 8, Issue 3 , Summer 2019, Pages 274-282

http://dx.doi.org/10.22105/riej.2019.193041.1091

Abstract
  This paper aims to study the multi-objective transportation problem with fuzzy parameters. These fuzzy parameters represented as (α, β) interval-valued fuzzy numbers instead of the normal fuzzy numbers. Using the signed distance ranking, the problem converted into the corresponding crisp ...  Read More

7. Evaluation of the efficiency by DEA a case study of hospital

Kh. Ghaziyani; B. Ejlaly; S. F. Bagheri

Volume 8, Issue 3 , Summer 2019, Pages 283-293

http://dx.doi.org/10.22105/riej.2020.211600.1106

Abstract
  Data Envelopment Analysis (DEA) is a nonparametric technique used to determine the relative efficiency of Decision Making Units (DMUs). Results from DEA analysis yield important information regarding the optimal operating capabilities of each unit. This paper studies DEA to hospital sectors and identifies ...  Read More