International Journal of Research in Industrial EngineeringInternational Journal of Research in Industrial Engineering
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Wed, 19 Jun 2019 09:44:01 +0100FeedCreatorInternational Journal of Research in Industrial Engineering
http://www.riejournal.com/
Feed provided by International Journal of Research in Industrial Engineering. Click to visit.A simulated annealing optimization algorithm for equal and un-equal area construction site ...
http://www.riejournal.com/article_82716_0.html
Construction site layout planning (CSLP) is an important problem because of its impact on time, cost, productivity, and safety of the projects. In this paper, CSLP is formulated by the quadratic assignment problem (QAP). At first, two case studies including equal and un-equal area facilities were solved by the simulated annealing optimization algorithm. Then, the obtained results had been compared with the other papers. The comparisons show that the proposed SA is as efficient as ACO, PSO, CBO, ECBO, WOA, WOA-CBO, and ACO-PA which had been proposed by other papers for the same problems. As a result, the comparisons show that SA is as capable as other meta-heuristics of solving the combinatorial optimization problems like CSLP, while the hardware properties and computational times had been compared. Besides the comparisons, the design of experiments shows the relationship between each SA parameter and the computational time of the algorithm. Also, the history of convergence of the proposed SA indicates the high speed of reaching the optimal solution and the artificial intelligence of the proposed SA.Wed, 13 Feb 2019 20:30:00 +0100Multi-objective linear mathematical programming for solving U-shaped robotic assembly line balancing
http://www.riejournal.com/article_83032_11196.html
In recent years, robots have been an eminent solution for manufacturers to facilitate their process and focus on a variety of their products. As the importance of robot usages, our paper focuses on the robotics assembly line. In this paper, we have considered the cycle time, robot operational costs, robot purchase costs, and robot energy consumptions. In the following, we add robot failure rates to have an efficient and high-quality assembly line. The presented model is a multi-objective problem, therefore, the linear programming methods as goal programming and augmented ε-constraint method are applied to optimize the problem. In the end, we have considered a case study to examine and show the applicability of the proposed model on the real situation.Sun, 31 Mar 2019 19:30:00 +0100On solving two-person zero-sum fuzzy matrix games via linear programming approach
http://www.riejournal.com/article_82776_11196.html
In this paper, a two-person zero-sum matrix game with fuzzy numbers payoff is introduced. Using the fuzzy number comparison introduced by Rouben's method (1991), the fuzzy payoff is converted into the corresponding deterministic payoff. Then, for each player, a linear programming problem is formulated. Also, a solution procedure for solving each problem is proposed. Finally, a numerical example is given for illustration. Sun, 31 Mar 2019 19:30:00 +0100Developing 360 degree performance evaluation method for school teachers
http://www.riejournal.com/article_82717_11196.html
The purpose of this study is to provide a proper method for evaluating performance of teachers, which leads to authorities awareness about the quality and quantity of activities that are acceptable to the organization; also creating the grounds for empowering human resources, reduction of dissatisfaction, and complaints. This can result in eliminating discrimination or unfair judgments and therefore reduction of tensions, and conflicts between managers and employees. The Analytic Hierarchy Process (AHP) which was developed by Saaty is a decision analysis tool. It has been applied to many different decision fields. In this paper, we use AHP as a performance assessment tool to inquire diverse assessments in the organization about the performance of each employee. Since the number of the items to be compared in AHP is increased, the number of pairwise comparisons that each assessor answer, are increased drastically. So, we develop a method called EVMP to elicit the preference vector of pairwise comparison matrices with missing entries. The newly developed method is tested in a school; the generated results have been proved by experts.Sun, 31 Mar 2019 19:30:00 +0100Assessing the awareness of local consumer’s product producers towards packaging standards in ...
http://www.riejournal.com/article_82718_11196.html
Packaging plays an important role in ensuring that the produced product is well contained, protected, and preserved. Due to its significance, the researcher decided to undertake research aiming at examining the awareness of local producers towards products’ packaging. This research employs a descriptive design in carrying it out where a sample of 120 respondents from different companies give a list of questions regarding packaging and also inspection is done in the market to observe how the products have been packed. Findings revealed that the awareness of Tanzanian local producers is still very low whereby 75% of packaging workers are unskilled. Also, training regarding packaging is not conducted in an effective manner as most companies train their employee only once when they employ them. It is also noted that the local producers mainly focus on the ability of the package to contain the product paying less attention to the ability of the package to protect and preserve. Based on these findings, it is suggested that the knowledge of value chain management has to be imparted to local producers by the local business institution. It is also proposed that training should be given frequently to packaging crew to ensure they do their job effectively. Moreover, it is recommended that to increase the efficiency and cost reduction, it is better for companies to employ experienced workers or those with at least form six or high level of education in packaging section as it is easy to train and they can understand easily. Sun, 31 Mar 2019 19:30:00 +0100Stuff scheduling in capillary marketing and analyse of its impact on the company’s financial ...
http://www.riejournal.com/article_84312_11196.html
In today’s competitive business environment, supply chain performance is one of the most critical issues in the various industries; there is much argumentation about the fact that supply chain performance is the basis of the supply chain management efficiency. In this regard, the distribution sector is the most important part of the supply chain. Due to the pulse of a company is in the hands of its sales and distribution department. This article proposes a new mixed integrated linear programming model MILP for scheduling distribution channel membership based on capillary marketing by considering staffs experiences at Pak's pasteurized dairy in one month. The purpose of this study is to reduce the costs of the company along with the increase in sales. Constraints affecting target functions such as minimum sales per employee and maximum overtime days are also considered. The computational experiment by GAMS software demonstrates the effectiveness of the model in reaching its objectives.Sun, 31 Mar 2019 19:30:00 +0100Study on the effect of different types of crude oils on the rate of corrosion and the ...
http://www.riejournal.com/article_84428_11196.html
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 different types of ferrous metals which are frequently used in the crude oil refining industries. The sulfur content, salt content, acidity, and mercaptans content of each crude oil are determined in order to use XRF analyzer, salt analyzer, and titration methods. A set of equal size metal pieces are immersed in both crude oils separately for 15, 30, and 45 days and their corrosion rates are determined by using relative weight loss after these time periods while observing the corroded metal surface under the optical microscope, and the dissolved metal concentration in each crude oil sample is tested by the AAS. The hardness of each metal piece is tested before and after the immersion in crude oil with the aid of Vicker’s hardness tester. It is found that a higher amount of sulfur, acidity, and mercaptans and lower amount of salt present in Das blend than Murban. We have found there is some significant rate of corrosion from most of the metals and higher amount of dissolved metallic concentration in samples of both crude oils with respect to those metals. It is observed that there is a slight reduction in hardness of all metal pieces due to the corrosion.Sun, 31 Mar 2019 19:30:00 +0100Number theoretic properties of the commutative ring Zn
http://www.riejournal.com/article_82715_11196.html
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 and congruent to zero modulo n with at least one another element of D, respectively. Then D can be written as the disjoint union of D1 and D2 in Zn. We explore the results on these sets based on all the characterizations of n. We obtain a formula for enumerating the cardinality of the set of all non-unit elements in Zn whose principal ideals are equal. Further, we present an algorithm for enumerating these sets of all non-unit elements.Sun, 31 Mar 2019 19:30:00 +0100Excessive sound noise risk assessment in textile mills of an Ethiopian- Kombolcha textile ...
http://www.riejournal.com/article_85623_0.html
In countries like Ethiopia, the textile industries are facing a big problem of sound noise pollution. In these countries, the industrial hearing conservation program is not yet clearly developed. Thus, characterizing excessive noise pollutions in textile industries have been the aim of this research project and Kombolcha Textile Mill (KTM) is chosen as the case study. The study is concerned with the noise exposure and its characteristics at the different section of the Textile Mill. Before the actual excessive noise level measurements were collected in the Textile Mill, main areas where measurements were done had to be identified. This was done by prior physical observation and A-Weighted time-averaged sound pressure levels (L_Aeq) survey. More than one hundred walkthrough measurement points were done inside the textile mill. These data were analyzed using MATLAB software packages. Based on our analysis, the spinning and the weaving sections of the mills with its unit processes were identified as potential noise pollution in the factory. On these sections, the measurements were done for 4 – 5 h/d. The instrument used for measurements was a precision integrated portable professional sound level meter. The findings revealed that the KTM employees are working in hazardous environments of above 90 dB, which is the recommended safe limit of noise in the working environment for 8 h used in international standard. As a result an engineering and administration programs which includes different methods of how to control the problem has been recommended for conserving hearing at the KTM.Tue, 26 Mar 2019 19:30:00 +0100Application of total productive maintenance in service organization
http://www.riejournal.com/article_85624_0.html
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 leads to disrupt of the university programs such as exams, trainings and so on. This paper uses TPM for solving the above mentioned problem by employing Overall equipment effectiveness (OEE). The OEE value on the centre is 35% which is less than world class standard of 85%. Therefore, the center needs urgent improvement in typical equipment maintenance management program. Advantages of TPM for the center includes better utilized equipment, clean and pleasant workplace, highly motivated employee, and satisfied customer.Tue, 26 Mar 2019 19:30:00 +0100Ranking efficient DMUs using the Tchebycheff norm with Fuzzy data in DEA
http://www.riejournal.com/article_88475_0.html
In many real applications, the data of production processes cannot be precisely measured. Hence the input and output of decision making units (DMUs) in data envelopment (DEA) may be imprecise or fuzzy-numbered, in original DEA models, inputs and outputs are measured by exact values on a ratio scale, therefore conventional DEA can't easily measure the performance of DMUs and ranking them. The researcher introduce mane deferent model for ranking DMUs by fuzzy number. In this paper we proposed a new method by using the Tchebycheff norm for ranking DMUs with fuzzy data. We explain our method by numerical example with triangular fuzzy number.Fri, 07 Jun 2019 19:30:00 +0100