Engineering Optimization
1. Data envelopment analysis for estimate efficiency and ranking operating rooms: a case study

Sh. Ghasemi; A. Aghsami; M. Rabbani

Volume 10, Issue 1 , Winter 2021, , Pages 67-86

http://dx.doi.org/10.22105/riej.2021.247705.1143

Abstract
  Data Envelopment Analysis (DEA) is one of the non-parametric methods for evaluating each unit's efficiency. Limited resources in the healthcare system are the main reason for measuring the efficiency of hospitals. Because Operating Rooms (OR) are the most vital part of any hospital, we determine the ...  Read More

Engineering Optimization
2. Formulation of a customer-oriented product and determination of optimum design parameters using response surface methodology

Sh. T. Alam

Volume 9, Issue 4 , Autumn 2020, , Pages 349-363

http://dx.doi.org/10.22105/riej.2020.256074.1147

Abstract
  The development of a product demands numbers of consideration and customer-based product dominates the present market. This study aims to formulate a customer-oriented product and investigate the optimum design parameters level for this formulation. The customer-oriented product named 'CNC PCB Plotter' ...  Read More

Engineering Optimization
3. Proposing the use of fine stone cutting factory as recycled materials in concrete and study of design economy and environmental protection

M. Sayadi; M. Ghomi

Volume 9, Issue 3 , Summer 2020, , Pages 271-285

http://dx.doi.org/10.22105/riej.2020.258012.1150

Abstract
  During the past years, extensive studies have been performed on concretes containing rice husk ash and recycled aggregates, which have shown the advantages of those concretes. Comparison of recycled concrete materials from the aggregates of quarrying plants for use in laboratory mixtures is the difference ...  Read More

Engineering Optimization
4. Integrated and periodic relief logistics planning for reaction phase in uncertainty condition and model solving by PSO algorithm

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

Volume 8, Issue 4 , Autumn 2019, , Pages 294-311

http://dx.doi.org/10.22105/riej.2020.219060.1120

Abstract
  Disaster relief logistics is considered to be one of the major activities in disaster management. This research studies response phase of the disaster management cycle. To do so, a multi-purpose integrated model for a three-level relief cycle logistics is provided under an uncertainty condition and on ...  Read More

Engineering Optimization
5. Study on the effect of different types of crude oils on the rate of corrosion and the properties of some selected ferrous metals

S. Aluvihara; J. K. Premachandra

Volume 8, Issue 1 , Spring 2019, , Pages 66-76

http://dx.doi.org/10.22105/riej.2019.170944.1078

Abstract
  Crude oil is a predominant natural resource and also it causes the metallic corrosion in the industry of crude oil refining due to some corrosive properties of crude oils. In the current research, it is expected to investigate the effect of such compounds of crude oils on the rate of corrosion of seven ...  Read More

Engineering Optimization
6. Scheduling Project Crashing Time Using Linear Programming Approach: Case Study

K. Chitra; P. Halder

Volume 6, Issue 4 , Autumn 2017, , Pages 283-292

http://dx.doi.org/10.22105/riej.2017.96572.1010

Abstract
  In today’s competitive environment completing a project within time and budget, is very challenging task for the project managers. This aim of this study is to develop a model that finds a proper trade-off between time and cost to expedite the execution process. Critical path method (CPM) is used ...  Read More

Engineering Optimization
7. Reviewing on Nanotechnology for Creating Antimicrobial for Chicken Feed: Max-Min Optimization Approach

A. H. Niknamfar; H. Esmaeili

Volume 6, Issue 4 , Autumn 2017, , Pages 312-327

http://dx.doi.org/10.22105/riej.2017.100933.1021

Abstract
  Nanotechnology deals with studies of phenomena and manipulation on elements of matter at the atomic, molecular and macromolecular level (rangefrom1to100nm), where the properties of matter are significantly different from properties at larger scales of dimensions. Nanotechnology is science, engineering, ...  Read More

Engineering Optimization
8. Determination of Optimum Smoothing Constant of Single Exponential Smoothing Method: A Case Study

C. L. Karmaker

Volume 6, Issue 3 , Autumn 2017, , Pages 184-192

http://dx.doi.org/10.22105/riej.2017.49603

Abstract
  Exponential smoothing is a sophisticated forecasting method that works based on previous forecast plus a percentage of the forecast error. A key issue of this technique is the proper choice of exponential smoothing constant. In order to minimize forecasting errors, choosing an appropriate value of smoothing ...  Read More