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1. 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 , Winter 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

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2. Application of total productive maintenance in service organization

A. Y. Ali

Volume 8, Issue 2 , Spring 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

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3. Number theoretic properties of the commutative ring Zn

Sh. Sajana; D. Bharathi

Volume 8, Issue 1 , Spring 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

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4. Multi-objective sequence dependent setup times hybrid flowshop scheduling: A literature review

F. Ghassemi Tari; M. Rezapour Niari

Volume 7, Issue 3 , Autumn 2018, , Pages 254-306

http://dx.doi.org/10.22105/riej.2018.145136.1057

Abstract
  Multi-criteria sequence dependent setup times scheduling problems exist almost everywhere in real modern manufacturing world environments. Among them, Sequence Dependent Setup Times-Multi-Objective Hybrid Flowshop Scheduling Problem (SDST-MOHFSP) has been an intensifying attention of researchers and ...  Read More

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5. Fixed point theorems of LW-type Lipschitz cyclic mappings in complete B-metric-like spaces

Sh. Weng; Y. Zhang; D. P. Wu

Volume 7, Issue 2 , Summer 2018, , Pages 136-146

http://dx.doi.org/10.22105/riej.2018.143285.1051

Abstract
  The research of Fixed Point Theorems (FPTs) plays an important role in nonlinear analysis. It is of great theoretical significance and profound application value to study general abstract theory in a B-Metric-Like Space (BMLS). So, it is an important topic to study the Fixed Point Theory (FPT) in a BMLS. ...  Read More

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6. Difference divisor graph of the finite group

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

Volume 7, Issue 2 , Summer 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

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7. 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 , Spring 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