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An Integrated Approach for Enhancing the Quality of the Product by Combining Robust Design and Customer Requirements

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QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL 2014年第8期30卷 1285-1292页

作者： Shahriari, Hamid Haji, Mehdi Janizade Eslamipoor, Reza KN Toosi Univ Technol Dept Ind Engn Tehran Iran Sharif Univ Technol Ind & Syst Engn Dept Tehran Iran

Enhancing the quality of the product has always been one considerable concern of production process management, and this subject gave way to implementing so many methods including robust design. In this paper, robust design utilizes response surface methodology (RSM) considering the mean and variance of the response variable regarding system design, parameter design, and tolerance design. In this paper, customer requirements and robust design are regarded simultaneously to achieve enriched quality. Subsequently, with a non-linear programming, a novel method for integrating RSM and quality function deployment has been proposed to achieve robustness in design. The customer requirements are regarded in every stage of product development process meaning system design, parameter design and tolerance design. To validate the applicability of the proposed approach, it has been implemented in a real case of chemical industry. Research findings show that the proposed method is much better than other existing methods including MSE and dual response methods. According to this method, the resulted mean is better than MSE method, and more importantly, the variance of the process is approximately 14% and 10% lesser than dual response and MSE method. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： robust design response surface methodology (RSM) quality function deployment customer non-linear programming

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A bioeconomic analysis of an emerald ash borer invasion of an urban forest with multiple jurisdictions

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RESOURCE AND ENERGY ECONOMICS 2014年第1期36卷 270-289页

作者： Kovacs, Kent F. Haight, Robert G. Mercader, Rodrigo J. McCullough, Deborah G. Univ Arkansas Dept Agr Econ & Agribusiness Fayetteville AR 72762 USA US Forest Serv No Res Stn St Paul MN 55108 USA Washburn Univ Dept Biol Topeka KS 66621 USA Michigan State Univ Dept Entomol E Lansing MI 48824 USA Michigan State Univ Dept Forestry E Lansing MI 48824 USA

Bio-invasions occur in management mosaics where local control affects spread and damage across political boundaries. We address two obstacles to local implementation of optimal regional control of a bio-invasion that damages public and private resources across jurisdictions: lack of local funds to protect the public resource and lack of access to protect the private resource. To evaluate these obstacles, we develop a spatial-dynamic model of the optimal control of emerald ash borer (EAB) in the Twin Cities metropolitan area of Minnesota, USA. We focus on managing valuable host trees with preventative insecticide treatment or pre-emptive removal to slow EAB spread. The model includes spatial variation in the ownership and benefits of host trees, the costs of management, and the budgets of municipal jurisdictions. We develop and evaluate centralized strategies for 17 jurisdictions surrounding the infestation. The central planner determines the quantities of trees in public ownership to treat and remove over time, to maximize benefits of surviving trees net costs of management across public and private ownerships, subject to constraints on municipal budgets, management activities, and access to private trees. The results suggest that centralizing the budget across jurisdictions rather than increasing any one municipal budget does more to increase total net benefits. Strategies with insecticide treatment are superior to ones with pre-emptive removal because they reduce the quantity of susceptible trees at lower cost and protect the benefits of healthy trees. Increasing the accessibility of private trees to public management substantially slows EAB spread and improves total net benefit. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Invasive species Management Spatial control Emerald ash borer non-linear programming

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Simulation-optimization via Kriging and bootstrapping: a survey

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JOURNAL OF SIMULATION 2014年第4期8卷 241-250页

作者： Kleijnen, Jack P. C. Tilburg Univ NL-5000 LE Tilburg Netherlands

This article surveys optimization of simulated systems. The simulation may be either deterministic or random. The survey reflects the author's extensive experience with simulation-optimization through Kriging (or Gaussian process) metamodels, analysed through parametric bootstrapping for deterministic and random simulation and distribution-free bootstrapping (or resampling) for random simulation. The survey covers: (1) simulation-optimization through 'efficient global optimization' using 'expected improvement' (EI);this EI uses the Kriging predictor variance, which can be estimated through bootstrapping accounting for the estimation of the Kriging parameters;(2) optimization with constraints for multiple random simulation outputs and deterministic inputs through mathematical programming applied to Kriging metamodels validated through bootstrapping;(3) Taguchian robust optimization for uncertain environments, using mathematical programming-applied to Kriging metamodels-and bootstrapping to estimate the variability of the Kriging metamodels and the resulting robust solution;(4) bootstrapping for improving convexity or preserving monotonicity of the Kriging metamodel.

关键词： simulation optimization stochastic process non-linear programming risk

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Source and Channel Optimal Rate LDPC Code Design for one Sender in BE-MAC with Source Correlation 7

Source and Channel Optimal Rate LDPC Code Design for one Sen...

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7th International Symposium on Telecommunications (IST)

作者： Tavakoli, H. Univ Guilan Fac Engn Dept Elect Engn Rasht Iran

ISBN: (纸本)9781479953592

In this paper, we present an extension of the semi-definite programming formulation of the optimal rate code design in single link Binary Erasure Channel (BEC) proposed by the authors to the Binary Erasure Multiple Access Channel (BE-MAC) with two sources correlation. This new way can be easily extended to the multiple access senders. Simulation results show the efficiency and effectiveness of the new approach in practice.

关键词： Binary Erasure Channel Binary Erasure Multiple Access Channel linear programming non-linear programming Semidefinite programming

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Model and Design of Cogeneration System for Different Demands of Desalination Water, Heat and Power Production

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Chinese Journal of Chemical Engineering 2014年第3期22卷 330-338页

作者：吴现力胡仰栋伍联营李红 College of Chemistry and Chemical Engineering Ocean University of China

In order to improve the energy efficiency, reduce the CO2 emission and decrease the cost, a cogenera- tion system for desalination water, heat and power production was studied in this paper. The superstructure of the cogeneration system consisted of a coal-based thermal power plant （TPP）, a multi-stage flash desalination （MSF） module and reverse osmosis desalination （RO） module. For different demands of water, heat and power production, the corresponding optimal production structure was different. After reasonable simplification, the process model ot each unit was built. The economical model, including the unit investment, and operation and maintenance cost, was presented. By solving this non-linear programming （NLP） model, whose objective is to minimize the annual cost, an optimal cogeneration system can be obtained. Compared to separate production systems, the optimal system can reduce 16.1%-21.7% of the total annual cost. showing this design method was effective.

关键词： cogeneration system thermal power plant multi-stage flash desalination reverse osmosis desalination non-linear programming optimal design

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Evaluation of Maximum Reliability Using Co-efficient of Variance for Parallel System Model

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JOURNAL OF INFORMATION & OPTIMIZATION SCIENCES 2015年第4期36卷 393-403页

作者： Razak, K. Abdul Rajakumar, K. TRP Engn Coll SRM Grp Dept Math Tiruchirappalli Tamil Nadu India Trichy Engn Coll Dept Math Tiruchirappalli Tamil Nadu India

The reliability analysis of a component or a system is an important concept in almost all engineering disciplines. In general, fuzzy sets are used to analyze the system reliability. The system reliability may be formed as linear or nonlinear programming with cost function in fuzzy environment. To analyze the fuzzy system reliability, the reliability of each component of the system is represented as fuzzy number in nature. In this paper, we have presented the parallel system model with fuzzy cost function to evaluate the maximum reliability subject to minimum cost using trapezoidal fuzzy number and to find out the Co-efficient of Variance for each membership function. A numerical example is given to illustrate the model for nonlinear programming and to evaluate the system reliability.

关键词： Fuzzy sets Fuzzy Reliability Parallel system Trapezoidal fuzzy number non-linear programming

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A wavelet hybrid method based on ARIMA and support vector regression forecasts

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INTERNATIONAL JOURNAL OF ENERGY AND STATISTICS 2015年第2期3卷

作者： Teixeira Junior, Luiz Albino Rodrigues, Samuel Bellido Carreno Franco, Edgar Manuel Lindbeck da Silva, Arinei Carlos Fed Univ Latin Amer Integrat Latin Amer Inst Technol Infrastruct & Terr Foz Do Iguacu PR Brazil Univ Fed Parana Postgrad Program Numer Methods Engn Curitiba Parana Brazil State Univ West Parana Dept Elect Engn Cascavel PR Brazil

In this paper, we put forward a new hybrid methodology to generate forecasts of time series. Indeed, the proposed forecaster is a HWCF that integrates the following techniques: wavelet decomposition;ARIMA models;SVRs;wavelet combination of forecasts;and non-linear programming. Basically, the HWCF is able to capture, simultaneously, linear and non-linear auto-dependence structures exhibited by a time series, which are represented, at time t, by both the linear and non-linear combined forecasts: L-C,L-t and N-C,N-t, respectively. After obtaining the combined forecasts L-C,L-t and N-C,N-t, they are summed (i. e., L-C,L-t + N-C,N-t = yh,t), producing the hybrid forecast yh,t, for each instant t. The numerical results show that HWCF achieved relevant accuracy gains in forecasting process of the annual time series of sunspot, when comparing with other ten competitive forecasters.

关键词： Wavelet decomposition ARIMA model support vector regression hybrid wavelet combination non-linear programming

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An FPTAS for minimizing a class of low-rank quasi-concave functions over a convex set

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OPERATIONS RESEARCH LETTERS 2013年第2期41卷 191-196页

作者： Goyal, Vineet Ravi, R. Columbia Univ New York NY 10027 USA Carnegie Mellon Univ Tepper Sch Business Pittsburgh PA 15213 USA

We consider the problem of minimizing a class of quasi-concave functions over a convex set. Quasi-concave functions are generalizations of concave functions and NP-hard to minimize in general. We present a simple fully polynomial time approximation scheme (FPTAS) for minimizing a class of low-rank quasi-concave functions. Our algorithm solves a polynomial number of linear minimization problems and computes an extreme point near-optimal solution. Therefore, it applies directly to combinatorial 0-1 problems where the convex hull of feasible solutions is known. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Quasi-concave programming non-linear programming non-convex programming Polynomial approximation schemes

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Analyzing the price skimming strategy for new product pricing

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SCIENTIA IRANICA 2013年第6期20卷 2099-2108页

作者： Shavandi, H. Zare, A. G. Sharif Univ Technol Dept Ind Engn Tehran Iran

This article presents a new model for pricing a new product considering a skimming pricing strategy in the presence of competition. We consider two periods for price setting, including skimming and an economy period. The problem is to decide on skimming as well as economy price, in order to maximize total profit. The derived model is a non-linear programming model and we have analyzed the structure and properties of an optimal solution to develop a solution method. Analytical results, as well as managerial insights, are presented by mathematical and numerical analyses. (C) 2013 Sharif University of Technology. All rights reserved.

关键词： Skimming pricing non-linear programming New product development Pricing policy Competition

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Thermodynamic simulation of transesterification reaction by Gibbs energy minimization

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FLUID PHASE EQUILIBRIA 2013年 341卷 12-22页

作者： Yancy-Caballero, Daison M. Guirardello, Reginaldo Univ Estadual Campinas UNICAMP Sch Chem Engn BR-13083852 Campinas SP Brazil

In this study, simultaneous chemical and phase equilibrium calculations were carried out by the method of direct Gibbs energy minimization to perform a thermodynamic analysis of transesterification reaction of soybean oil with both ethanol and methanol in order to improve the processes for producing biodiesel. The CONOPT solver was used to solve the problem as a nonlinear programming model in the GAMS (R) 23.2.1 software. In addition, the UNIFAC model was employed to describe the liquid phase non-idealities. A strategy of balance of radicals is proposed to satisfy the requirement of conservation of number of moles in the specific case of transesterification reaction, in order to take into account the degrees of freedom of reacting system without explicitly writing all individual reactions. The results showed that the use of optimization techniques associated with the GAMS software are useful and efficient tools to calculate the chemical and phase equilibrium by minimizing of the Gibbs energy, provided that different initial guesses are used. Furthermore, the computational times spent in the calculations were quite small. (C) 2012 Elsevier B.V. All rights reserved.

关键词： Biodiesel Gibbs energy minimization Chemical and phase equilibrium non-linear programming GAMS

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