International Journal of Research in Industrial EngineeringInternational Journal of Research in Industrial Engineering
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Sat, 16 Feb 2019 17:14:58 +0100FeedCreatorInternational Journal of Research in Industrial Engineering
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Feed provided by International Journal of Research in Industrial Engineering. Click to visit.Development of a doctor scheduling system: a constraint satisfaction and penalty minimisation ...
http://www.riejournal.com/article_80629_7548.html
Doctor scheduling is a complex, costly and time-consuming exercise. This study develops a constraint satisfaction and penalty minimisation scheduling model for meeting ‘hard constraints’ and minimises the cost of violating ‘soft constraints’, i.e. the user inputs, the total number of doctors to be scheduled, the maximum penalty to be met, and the minimum number of doctors to be assigned per shift. The algorithm creates a schedule which checks against all the constraints. The total schedule penalty associated with the constraint violations should be less than or equal to the user input penalty. If this condition is met, the schedule gets produced as the final and near-optimal solution. The model is managed to create a near optimal schedule with the minimal rule violations. However, it is challenging to provide a schedule with no rule violations. Such a situation is shown by the amount of computational time required to create a zero-penalty schedule, hours or even days needed to create a zero-penalty schedule. The system creates a schedule for a short period (weekly schedule) to promote flexibility; however, such a system does not promote fairness. Fairness is achieved through a cyclic schedule with rotations equal to the total number of doctors being scheduled. The system is managed to create a streamlined and flexible working environment and helped to improve the quality of healthcare. An optimization protocol can be incorporated into the system to reduce the search space and get the best optimal schedule since it is possible to get many schedules under the same user-defined parameters.Fri, 30 Nov 2018 20:30:00 +0100A 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 +0100A framework to evaluate and improve supply chain: FAHP based case study on a supermarket
http://www.riejournal.com/article_80556_7548.html
Nowadays, the supply chain has become a buzzword in the business field. The only supply chain can help to lead a business in an organized way. However, in a supermarket, the supply chain is very important, but they need to ensure better communication with the supplier, customer, and internal management too. Each factor of the supply chain has a good effect on itself. The purpose of this research is to explore the important supermarket supply chain factors found in the literature and from supply chain experts and to develop a framework which can help to arrange the criteria in a sequence from most important to the worst by considering each sector of the supply chain. This paper has studied one of the supermarkets in Bangladesh, namely Save ‘n’ Safe. Authors have taken FAHP, one of the tools of MCDM, to figure it out the most effective factors. The result reveals that managing inventory, internal information sharing, and accurate demand forecasting are the most affected factors for the Save ‘n’ Safe (a supermarket). Finally, some recommendations have been given to improve the existing situation. This study can be used not only in the other supermarkets but also any other retail or grocery shops.Fri, 30 Nov 2018 20:30:00 +0100Developing 360 Degree Performance Evaluation Method for School Teachers
http://www.riejournal.com/article_82717_0.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 the empowering human resources, reduction of dissatisfaction and complaints. This can result in eliminating discrimination or unfair judgments and therefor 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 into 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 is to answer is increased drastically. So we develop a method called EVMP to elicit the preference vector of pairwise comparison matrices with missing entries. The new developed method is tested in a school and generated results were proved by experts.Wed, 13 Feb 2019 20:30:00 +0100Implementation of fuzzy rule-based algorithms in p control chart to improve the performance of ...
http://www.riejournal.com/article_80176_7548.html
In the statistical process control when the process is very sensitive and control limit shifts are the prime concerns, there fuzzy control charts can be a better solution. In decision making, extra “rather in control” and “rather out of control” decisions facilitate to find out the slight changes in the control chart. The automation of fuzzy control chart in the Excel VBA makes the data input and decisions making process faster. The vagueness of the data is removed as the charts deal with the triangular or trapezoidal area rather than some points in the control limits. Alongside the fuzzy control charts, Marcucci approach has been followed to find out the goodness-of-fit of the samples and to find out the effectiveness of fuzzy control charts.Fri, 30 Nov 2018 20:30:00 +0100On solving two- person zero- sum fuzzy matrix games via linear programming approach
http://www.riejournal.com/article_82776_0.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 determinstic 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.Fri, 15 Feb 2019 20:30:00 +0100Optimum solar and wind model with particle optimization (PSO)
http://www.riejournal.com/article_80496_7548.html
Although the development of science and technology in the present era has increased human satisfaction from life, it has caused the problems such as environmental pollution and increased demand for energy carriers, especially fossil fuels. Considering that fossil fuels can be exhausted, the most suitable solutions to address the consequences are the use of renewable energy sources to generate electricity. In this paper, using the Particle Cumulative Optimization (PSO) algorithm, we have tried to design an optimal photovoltaic and winding model to supply the power of an area in such a way that the electrical charge generated by this system has the reliable capability and economically viable. Fri, 30 Nov 2018 20:30:00 +0100Assessing the Awareness of Local Consumerâ€™s Product Producers towards Packaging Standards in ...
http://www.riejournal.com/article_82718_0.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. The research employs a descriptive design in carrying it out where a sample of 120 respondents from different companies were given a list of questions regarding packaging and also inspection was 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 of companies train their employee only once when they employ them. It was also noted that, local producers mainly focuses on the ability of the package to contain the product paying less attention to 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 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.Wed, 13 Feb 2019 20:30:00 +0100Trend extrapolation of domestic air travel demand in Nigeria (2018-2030)
http://www.riejournal.com/article_80301_7548.html
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 in Nigeria from year 2010 to 2017 was compared with the forecast. There seems to be periods of fluctuations in the demand for domestic air passenger travel in Nigeria from year 2010 to 2017 which are expected to have effect on the forecast of domestic air travel. Calculation and computation reveals that the coefficient of determination R2 is 0.203 which signifies a high error term such that the explanation level is very low; hence the prediction or forecast is unreliable. Despite the decline in the forecast of domestic air passenger demand in the future, and the fact that the forecast is unreliable, hence inconclusive as shown from the coefficient of determination, government agencies should be sensitive to the forecast and try to adopt new policies and strategies that will improve the demand for domestic air passenger travel in Nigeria.Fri, 30 Nov 2018 20:30:00 +0100Number Theoretic Properties of the Commutative Ring Z_n
http://www.riejournal.com/article_82715_0.html
This paper deals with the number theoretic properties of non-unit elements of the ring Z_n. Let D be the set of all non-trivial divisors of a positive integer n. Let D_1 and D_2 be the subsets of D having the least common multiple which is 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 D_1 and D_2 in Z_n. We explored the results on these sets based on all the characterizations of n. We obtained a formula for enumerating the cardinality of the set of all non-unit elements in Z_n whose principal ideals are equal and further we present an algorithm for enumerating these sets of all non-unit elements.Wed, 13 Feb 2019 20:30:00 +0100