Management Sciences
Relationship between passengers’ satisfaction and service quality in murtala muhammed international airport, Lagos, Nigeria

A. Adeniran; S. O. Fadare

Volume 7, Issue 3 , November 2018, , Pages 349-369

http://dx.doi.org/10.22105/riej.2018.134686.1045

Abstract
  The study examines the relationship between passengers’ satisfaction and service quality in MMIA. The sample size for the study is a total of three hundred and eighty-four (384), meanwhile, 58.3 percent of response rate was valid for data analysis. 49.1 percent valid questionnaire responses were ...  Read More

Data Envelopment Analysis, DEA
The survey of data envelopment analysis models in fuzzy stochastic environments

F. Z. Montazeri

Volume 8, Issue 4 , December 2019, , Pages 366-383

http://dx.doi.org/10.22105/riej.2020.219518.1121

Abstract
  One of the best techniques for evaluating the performance of organizations is data envelopment analysis. Data Envelopment Analysis (DEA) is a non-parametric method for evaluating the performance of decision-making units (DMUs) that recognizes the relative performance of DMUs based on mathematical programming. ...  Read More

Inventory, logistics, and transportation
Trend extrapolation of domestic air travel demand in Nigeria (2018-2030)

A. Adetayo Adeniran; K. Olufunto Adedotun

Volume 7, Issue 4 , December 2018, , Pages 468-481

http://dx.doi.org/10.22105/riej.2018.143367.1052

Abstract
  Trend analysis of domestic air travel demand in Nigeria was examined based on yearly passenger demand from 2010 to 2017. Ordinary Least Square (OLS) regression was used to forecast for twelve years (2018 to 2030) demand for domestic air passenger travel in Nigeria. The demand for domestic air passenger ...  Read More

Engineering Optimization
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 , April 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

Other
Six Sigma-DMAIC and food waste hierarchy-based framework for reducing food waste in University canteens in Ethiopia

A. Y. Ali

Volume 9, Issue 1 , March 2020, , Pages 77-83

http://dx.doi.org/10.22105/riej.2020.209160.1105

Abstract
  The aim of this paper is to propose a Six Sigma-DMAIC and food waste hierarchy-based framework that can be successfully implemented by Ethiopian University canteen managers to reduce food waste in a sustainable way. The importance of this research is twofold. First, the Six Sigma-DMAIC methodology is ...  Read More

Other
Unsteady Magnetohydrodynamic Stagnation Point Flow of a Nanofluid over a Slendering Stretching Sheet Using Buongiorno’s Model

R. V. M. S. S. Kiran Kumar; G. Vindo Kumar; S. V. K. Verma

Volume 7, Issue 1 , April 2018, , Pages 84-105

http://dx.doi.org/10.22105/riej.2018.102367.1028

Abstract
  This paper aimed to model and analyze the unsteady hydromagnetic boundary layer stagnation point nanofluid flow over a non-linear stretching surface through porous medium with variable wall thickness. The effects of radiation, dissipation, and slip velocity are taken into account. The formulation of ...  Read More

Mathematical modelling
Non-Standard Finite Difference Schemes for Solving Singular Lane-Emden Equation

H. Saberi Najafi; A. Yaghoubi

Volume 6, Issue 2 , June 2017, , Pages 161-171

http://dx.doi.org/10.22105/riej.2017.92303.1001

Abstract
  In this paper we construct Non-Standard finite difference schemes (NSFD) for numerical solution of nonlinear Lane-Emden type equations which are nonlinear ordinary dierential equations on semi-infinite domain. They are categorized as singular initial value problems. This equation describes a variety ...  Read More

Other
Difference divisor graph of the finite group

R. V M S S Kiran Kumar; T. Chalapathi

Volume 7, Issue 2 , September 2018, , Pages 235-242

http://dx.doi.org/10.22105/riej.2018.133136.1042

Abstract
  Let (Zn, +) be a finite group of integers modulo n and Dn a non-empty subset of Zn containing proper devisors of n. In this paper, we have introduced the difference divisor graph Diff (Zn, Dn) associated with Zn whose vertices coincide with Zn such that two distinct vertices are adjacent if and ...  Read More

Mathematical modelling
Influence of Wall Properties on the Peristaltic Flow of a Jeffrey Fluid in a Uniform Porous Channel under Heat Transfer

G. C. Sankad; P. S. Nagathan

Volume 6, Issue 3 , November 2017, , Pages 246-261

http://dx.doi.org/10.22105/riej.2017.98628.1014

Abstract
  Incompressible Jeffrey fluid under peristalsis is considered into permeable conduit. Magnetic effect and slip effect are studied for this channel in the existence of wall slip and heat transfer. Time average velocity, heat transfer coefficient and temperature are obtained analytically underneath the ...  Read More

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

H. Abd El-Wahed Khalifa

Volume 8, Issue 3 , September 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

Numerical Analysis
A Barzilai Borwein Adaptive Trust-Region Method for Solving Systems of Nonlinear Equation

F. Rahpeymaii; M. Kimiaei

Volume 6, Issue 4 , December 2017, , Pages 339-349

http://dx.doi.org/10.22105/riej.2017.101854.1027

Abstract
  In this paper, we introduce a new adaptive trust-region approach to solve systems of nonlinear equations. In order to improve the efficiency of adaptive radius strategy proposed by Esmaeili and Kimiaei [8], Barzilai Borwein technique (BB) [3] with low memory is used which can truly control the trust-region ...  Read More

Banking industry
A new method for solving fuzzy linear fractional programming problem with new ranking function

S. Kumar-Das

Volume 8, Issue 4 , December 2019, , Pages 384-393

http://dx.doi.org/10.22105/riej.2020.220850.1123

Abstract
  Because of uncertainty in the real life applications, reaching to the optimal solution is always time consuming and even sometimes impossible. In order to overcome these limitations the fuzzy set theory is introduced to handle it but not only incomplete information but also indeterminate and inconsistent ...  Read More

Cloud-based IoT: integration cloud computing with internet of things

Javad Pourqasem

Volume 7, Issue 4 , December 2018, , Pages 482-494

http://dx.doi.org/10.22105/riej.2018.88380

Abstract
  Internet of Things (IoT) technology is based on interconnected things in a dynamic and distributed environment. The IoT contains many widely pervasive and heterogeneous small things with limited storage, energy resources, and processing capacities. These limitations are an obstacle for developing IoT ...  Read More

Other
Number theoretic properties of the commutative ring Zn

Sh. Sajana; D. Bharathi

Volume 8, Issue 1 , April 2019, , Pages 77-88

http://dx.doi.org/10.22105/riej.2019.159539.1065

Abstract
  This paper deals with the number theoretic properties of non-unit elements of the ring Zn. Let D be the set of all non-trivial divisors of a positive integer n. Let D1 and D2 be the subsets of D having the least common multiple which are incongruent to zero modulo n with every other element of D ...  Read More

Machine Learning
Movie recommendation system using machine learning

F. Furtado; A. Singh

Volume 9, Issue 1 , March 2020, , Pages 84-98

http://dx.doi.org/10.22105/riej.2020.226178.1128

Abstract
  Nowadays, the recommendation system has made finding the things easy that we need. Movie recommendation systems aim at helping movie enthusiasts by suggesting what movie to watch without having to go through the long process of choosing from a large set of movies which go up to thousands and millions ...  Read More

Econometric Models
Solving Monetary (MIU) models with Linearized Euler Equations: Method of Undetermined Coefficients

S.F. Fakhrehosseini; Meysam kaviani

Volume 6, Issue 2 , June 2017, , Pages 172-183

http://dx.doi.org/10.22105/riej.2017.94115.1005

Abstract
  This paper attempts to solve a benchmark money in utility model by first order Taylor approximation to the policy function. After a brief summary of recent development in first order Taylor approximation in solving dynamic stochastic general equilibrium models, we choose Sidrauski’s Money in utility ...  Read More

Manufacturing and Logistics
Ultrasonic testing for mechanical engineering domain: present and future perspective

A. Sharma; A. K. Sinha

Volume 7, Issue 2 , September 2018, , Pages 243-253

http://dx.doi.org/10.22105/riej.2018.100730.1018

Abstract
  Ultrasonic testing uses high frequency sound waves of a range between 0.5 to 15 MHz to conduct testing. The basic principle and applications of ultrasonic testing techniques is enormous use under the domain of mechanical engineering applications. Importance of ultrasonic testing of rails, train wheels, ...  Read More

Total quality management and quality engineering
Removal of Copper Ions from Liquid Wastes by Adsorption Technique

E. Nassef; A. Mahmoud; H. Salah; Y. El-taweel

Volume 6, Issue 3 , November 2017, , Pages 255-268

http://dx.doi.org/10.22105/riej.2017.101704.1026

Abstract
  The present study aims to removal of copper ions (Cu2+) as a heavy metal ion from aqueous solution by a high inorganic molecular weight compound. This compound is modified clay (activated bentonite) which is used in oil well drilling, and obtained from local company. The experimental results showed that ...  Read More

Evaluation of the efficiency by DEA a case study of hospital

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

Volume 8, Issue 3 , September 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

Computational Intelligence
Restricting shoulder surfing: a modified graphical password Technique

P. Pandey

Volume 8, Issue 4 , December 2019, , Pages 394-405

http://dx.doi.org/10.22105/riej.2020.219732.1122

Abstract
  Graphical passwords are the ways in which user click on the image or user can select the image to authenticate themselves instead of giving passwords. This technique is more secure that textual password techniques. In this article, the shoulder surfing preventive mechanism of graphical password authentication ...  Read More

Scheduling
Modeling and Scheduling University Course Timetabling Problems

B. Naderi

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

http://dx.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

Inventory, logistics, and transportation
Solving a Bi-Objective Transportation Vehicle Routing Problem for Waste Collection by a New Hybrid Algorithm

H. Farrokhi-Asl; R. Tavakkoli-Moghaddam

Volume 5, 1(4) , November 2016, , Pages 16-42

http://dx.doi.org/10.22105/riej.2017.49168

Abstract
  This paper is an extension of the well-known vehicle routing problem (VRP) consisting of two stages. The first and second stages deal with the vehicle routing and transportation problems, respectively. Waste collection is one of the applications of the considered problem in a real world situation. A ...  Read More

Data Envelopment Analysis, DEA
The Methods of Ranking based Super Efficiency

M. Nayebi; F Hosseinzadeh Lotfi

Volume 5, 1(4) , November 2016, , Pages 43-66

http://dx.doi.org/10.22105/riej.2017.49169

Abstract
  The science of Data Envelopment Analysis (DEA) evaluates the effectiveness of decision making units. But, one of the problems of Data Envelopment Analysis (DEA) is that, if the number of units with the same efficiency equal to one was more than one, then we couldn’t select the best between them. ...  Read More

Other
Application of total productive maintenance in service organization

A. Y. Ali

Volume 8, Issue 2 , June 2019, , Pages 176-186

http://dx.doi.org/10.22105/riej.2019.170507.1076

Abstract
  This paper discusses the application of TPM in copy centre in Woldia University located in Woldia town, north wollo, Amhara region, Ethiopia. The problem encountered in the centre includes long waiting time due to frequent breakdown of equipment, unpleasant work environment, defective product etc. This ...  Read More

Human factors, ergonomics, and safety
Ergonomic furniture design for secondary girls school in Bangladesh

Md. Rahman; Md. Hasan; Ms. B. Datta

Volume 8, Issue 2 , June 2019, , Pages 187-202

http://dx.doi.org/10.22105/riej.2019.183323.1086

Abstract
  This study has been carried out to evaluate the number of mismatches between secondary girl student’s anthropometry and existing furniture dimensions in Bangladesh. In this study, 375 students (girls) are in classes 6-10 in the age group between 10-15 years that have randomly selected from three ...  Read More