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Multiple characteristics optimization in machining of GFRP composites using Grey relational analysis
, Pages 511-520 Arun Kumar Parida Rajesh Kumar Bhuyan and Bharat Chandra Routara PDF (685K) |
Abstract: In the present work, a multi-response optimization method is used to optimize the machining parameters in turning of glass fiber reinforced polymer (GFRP) composites. Parameters like spindle speed (N), feed rate (f) and depth of cut (d) are taken to obtain the responses such as surface roughness (Ra) and material removal rate (MRR). Taguchi’s L9 orthogonal array has been used for machining the work-piece. Analysis of variance (ANOVA) has been carried out to check the significant process parameter in a single objective performance characteristic. The multiple performance characteristics have been analysed using Grey relational analysis and an appreciable result has been reported with this approach. DOI: 10.5267/j.ijiec.2014.8.001 Keywords: ANOVA, Taguchi Method, Turning, Grey Relational Analysis |
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A production inventory model with exponential demand rate and reverse logistics
, Pages: 521-542 Ritu Raj Naresh Kumar Kaliraman, Shalini Chandra and Harish Chaudhary PDF (685K) |
Abstract: The objective of this paper is to develop an integrated production inventory model for reworkable items with exponential demand rate. This is a three-layer supply chain model with perspectives of supplier, producer and retailer. Supplier delivers raw material to the producer and finished goods to the retailer. We consider perfect and imperfect quality products, product reliability and reworking of imperfect items. After screening, defective items reworked at a cost just after the regular manufacturing schedule. At the beginning, the manufacturing system starts produce perfect items, after some time the manufacturing system can undergo into “out-of-control” situation from “in-control” situation, which is controlled by reverse logistic technique. This paper deliberates the effects of business strategies like optimum order size of raw material, exponential demand rate, production rate is demand dependent, idle times and reverse logistics for an integrated marketing system. Mathematica is used to develop the optimal solution of production rate and raw material order for maximum expected average profit. A numerical example and sensitivity analysis is illustrated to validate the model. DOI: 10.5267/j.ijiec.2014.7.006 Keywords: Imperfect Production, Reverse Logistics, Integrated, Supply Chain |
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A hybrid QFD-based approach in addressing supplier selection problem in product improvement process
, Pages: 543-560 Mehdi Rajabi Asadabadi PDF (685K) |
Abstract: This paper is about creating a hybrid QFD-based approach in which the best supplier is selected considering changing customer needs. In most previous studies employing a QFD approach, the possibility of changing customer needs is ignored. On the other hand, supplier selection is a challenging problem that could have been addressed by such a QFD. This paper attempts to create a hybrid QFD-based approach in which the internal relations between the elements are considered. It connects the new QFD to suppliers’ qualifications to create a hybrid supplier selection process. The best suppliers are selected based on the priorities of customer needs for each level of the product improvement plan. When a product is to be developed, the proposed methodology seems to create an efficient solution for supplier selection problem with respect to quality factors. DOI: 10.5267/j.ijiec.2014.7.005 Keywords: HOQ, Supplier Selection, QFD, MCDM |
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A simulation study on the performance of the sign test, Mann-Whitney test, Hodges-Lehmann estimator and control charts for Normal and Weibull data
, Pages: 561-574 Vadhana Jayathavaj and Adisak Pongpullponsak PDF (685K) |
Abstract: The new method to chart the Hodges-Lehmann estimator control chart is proposed in this study. The evaluation of the three nonparametric control charts - the Sign test (ST), Mann-Whitney (MW), and the Hodges-Lehmann estimator (HL), for the known process distribution using normal and Weibull data represent the symmetric and asymmetric shapes of the process based on the original method through the 10000 run lengths simulation. The result illustrates that the average run length performance of the ST and MW correspond to their respective test statistics but for HL’s performance, the result indicates that the average run length is much greater than that derived from Wilcoxon signed rank statistics. The Hodges-Lehmann estimator control chart by the new approach for the known process distribution will be the alternative method for the process that needs to robust outliers’ properties from this statistics. In addition, the simulation demonstrates that the performances of the Sign test (ST) from mean and median processes are varied in the skewed distribution, and moreover, the Sign test (ST) from the median process represents more accurate performance. Meanwhile, for the control groups, MW generated within control limits or without restriction shows slightly different performance. The performance of dual scheme for the above-mentioned variable parameters control charts also produce the weighted average values that effect from the tight control scheme to the regular control scheme. DOI: 10.5267/j.ijiec.2014.7.004 Keywords: Hodges-Lehmann estimator, Mann-Whitney, Normal distribution, Sign test, Statistical process control, Weibull distribution |
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A production inventory model with flexible manufacturing, random machine breakdown and stochastic repair time
, Pages: 575-588 S.R. Singh and Leena Prasher PDF (685K) |
Abstract: This paper derives a production inventory model over infinite planning horizon with flexible but unreliable manufacturing process and the stochastic repair time. Demand is stock dependent and during the period of sale it depends on reduction on selling price. Production rate is a function of demand and reliability of the production equipment is assumed to be exponentially decreasing function of time. Repair time is estimated using uniform probability density function. The objective of the study is to determine the optimal policy for production system, which maximizes the total profit subject to some constraints under consideration. The results are discussed with a numerical example to illustrate the theory. DOI: 10.5267/j.ijiec.2014.7.003 Keywords: Volume flexible manufacturing system, Stochastic machine breakdown, Stochastic repair time, Stock dependent demand |
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Coordination policy for a three echelon supply chain considering imperfect quality items
, Pages: 589-602 Narayan Singh, Bindu Vaish and S. R. Singh PDF (685K) |
Abstract: In this study, we develop a three echelon supply chain model for items to determine the optimal reliability and production rate, which achieves the biggest total integrated profit for an imperfect manufacturing process. Here, we have taken a supplier, a manufacturer and a retailer in which supplier supplies raw materials to manufacturer, manufacturer produces perfect and imperfect quality items because practically it happens and manufacturer supplies perfect quality items to the retailers. In production system, production facility may shift from an in-control state to an out-of-control state at any random time. The basic assumption of classical economic manufacturing quantity model is that all manufacturing items are of perfect quality but the assumption is not true in practice. The proposed study is formulated assuming that a certain percent of total product is defective. This percentage also varies with production rate and production run time. The defective items are restored in original quality by reworked at some costs to maintain the quality of products in a competitive market. Finally, numerical example and its graphical representation are given to illustrate the proposed model. Sensitivity analysis is also provided to test feasibility of the model. DOI: 10.5267/j.ijiec.2014.7.001 Keywords: Three echelon supply chain, Imperfect production process, Backlogging |
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A simulation optimization approach to apply value at risk analysis on the inventory routing problem with backlogged demand
, Pages: 603-620 Mohammad Abdollahi, Meysam Arvan, Aschkan Omidvar and Fatemeh Ameri PDF (685K) |
Abstract: Inventory Routing Problem (IRP) is defined as the combination of vehicle routing, inventory management and delivery scheduling decisions. In this study, a model for a basic inventory routing problem is proposed, which controls the risk of exceeding capital dedicated to an IRP with a value at risk (VaR) measure. It is assumed that the structure of the basic model is one to many, the time horizon is single period and fleet composition is homogeneous. The objective of the model is to minimize the expected total cost over a planning horizon at the same time considering the affordable risk. Since a stochastic IRP is an NP-hard problem and considering VaR makes it more complex, it is not feasible to solve the large-scale problems through an exact model. Hence, a new simulation optimization procedure is proposed to solve the problem. Finally, a numerical example is presented to demonstrate its accuracy and applicability. DOI: 10.5267/j.ijiec.2014.6.003 Keywords: Inventory Routing Problem, Simulation Optimization, Value at Risk, Risk Averse Distributor, Financial Risk Management |
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8. |
Optimal dynamic pricing and replenishment policies for deteriorating items
, Pages: 621-630 Masoud Rabbani, Nadia Pourmohammad Zia and Hamed Rafiei PDF (685K) |
Abstract: Marketing strategies and proper inventory replenishment policies are often incorporated by enterprises to stimulate demand and maximize profit. The aim of this paper is to represent an integrated model for dynamic pricing and inventory control of deteriorating items. To reflect the dynamic characteristic of the problem, the selling price is defined as a time-dependent function of the initial selling price and the discount rate. In this regard, the price is exponentially discounted to compensate negative impact of the deterioration. The planning horizon is assumed to be infinite and the deterioration rate is time-dependent. In addition to price, the demand rate is dependent on advertisement as a powerful marketing tool. Several theoretical results and an iterative solution algorithm are developed to provide the optimal solution. Finally, to show validity of the model and illustrate the solution procedure, numerical results are presented. DOI: 10.5267/j.ijiec.2014.6.002 Keywords: Dynamic pricing, Replenishment, Advertisement, Time-dependent deterioration rate |
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Selection of industrial robots using the Polygons area method
, Pages: 631-646 Mortaza Honarmande Azimi, Houshang Taghizadeh, Nasser Fegh-hi Farahmand and Jafar Pourmahmoud PDF (685K) |
Abstract: Selection of robots from the several proposed alternatives is a very important and tedious task. Decision makers are not limited to one method and several methods have been proposed for solving this problem. This study presents Polygons Area Method (PAM) as a multi attribute decision making method for robot selection problem. In this method, the maximum polygons area obtained from the attributes of an alternative robot on the radar chart is introduced as a decision-making criterion. The results of this method are compared with other typical multiple attribute decision-making methods (SAW, WPM, TOPSIS, and VIKOR) by giving two examples. To find similarity in ranking given by different methods, Spearman’s rank correlation coefficients are obtained for different pairs of MADM methods. It was observed that the introduced method is in good agreement with other well-known MADM methods in the robot selection problem. DOI: 10.5267/j.ijiec.2014.6.001 Keywords: Robot Selection, Multi-attribute Decision Making (MADM), Polygons Area Method (PAM) SAW, TOPSIS, VIKOR, WPM |
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Application of multi-stage Monte Carlo method for solving machining optimization problems
, Pages: 647-659 Miloš Madić, Marko Kovačević and Miroslav Radovanović PDF (685K) |
Abstract: Enhancing the overall machining performance implies optimization of machining processes, i.e. determination of optimal machining parameters combination. Optimization of machining processes is an active field of research where different optimization methods are being used to determine an optimal combination of different machining parameters. In this paper, multi-stage Monte Carlo (MC) method was employed to determine optimal combinations of machining parameters for six machining processes, i.e. drilling, turning, turn-milling, abrasive waterjet machining, electrochemical discharge machining and electrochemical micromachining. Optimization solutions obtained by using multi-stage MC method were compared with the optimization solutions of past researchers obtained by using meta-heuristic optimization methods, e.g. genetic algorithm, simulated annealing algorithm, artificial bee colony algorithm and teaching learning based optimization algorithm. The obtained results prove the applicability and suitability of the multi-stage MC method for solving machining optimization problems with up to four independent variables. Specific features, merits and drawbacks of the MC method were also discussed. DOI: 10.5267/j.ijiec.2014.7.002 Keywords: Monte Carlo method, Multi-stage, Machining, Optimization, Meta-heuristics |
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