The optimization of injection molding process for polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends is studied using Taguchi method and principalcomponent analysis (PCA). Four controllable process factors ...The optimization of injection molding process for polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends is studied using Taguchi method and principalcomponent analysis (PCA). Four controllable process factors are studied at three levels each in themanufacturing process. The L_9 orthogonal array is conducted to determine the optimum processfactor/level combination for single quality of mechanical properties. In addition, the principalcomponent analysis is employed to trans-form the correlated mechanical properties to a set ofuncorrelated components and to evaluate a comprehensive index for multi-response cases. Then theoptimum process factor/level combination for multiple qualities can be determined. Finally, theanalysis of variance is used to find out the most influential injection molding parameter for singleand multiple qualities problems.展开更多
We consider a manpower planning problem with single employee type over a long planning horizon and analyze the optimal recruitment and dismissal polices. Dynamic demands for manpower must be fulfilled by allocating en...We consider a manpower planning problem with single employee type over a long planning horizon and analyze the optimal recruitment and dismissal polices. Dynamic demands for manpower must be fulfilled by allocating enough number of employees. Costs for every employee include salary, recruitment and dismissal costs, in particular, setup costs when recruitment/dismissal activities occur. We formulate the problem as a multi-period decision model. Then we analyze properties of the problem and give an improved dynamic programming algorithm to minimize the total cost over the entire planning horizon. We report computational results to illustrate the effectiveness of the approach.展开更多
文摘The optimization of injection molding process for polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends is studied using Taguchi method and principalcomponent analysis (PCA). Four controllable process factors are studied at three levels each in themanufacturing process. The L_9 orthogonal array is conducted to determine the optimum processfactor/level combination for single quality of mechanical properties. In addition, the principalcomponent analysis is employed to trans-form the correlated mechanical properties to a set ofuncorrelated components and to evaluate a comprehensive index for multi-response cases. Then theoptimum process factor/level combination for multiple qualities can be determined. Finally, theanalysis of variance is used to find out the most influential injection molding parameter for singleand multiple qualities problems.
文摘We consider a manpower planning problem with single employee type over a long planning horizon and analyze the optimal recruitment and dismissal polices. Dynamic demands for manpower must be fulfilled by allocating enough number of employees. Costs for every employee include salary, recruitment and dismissal costs, in particular, setup costs when recruitment/dismissal activities occur. We formulate the problem as a multi-period decision model. Then we analyze properties of the problem and give an improved dynamic programming algorithm to minimize the total cost over the entire planning horizon. We report computational results to illustrate the effectiveness of the approach.
