This paper considers a different version of the parallel machines scheduling problem in which the parallel jobs simultaneously requirea pre-specifiedjob-dependent number of machines when being processed.This relaxation departs from one of the classic scheduling assumptions. While the analytical conditions can be easily statedfor some simple models, a graph model approach is required when confli...

Manufacturing performances tend to produce defects due to various reasons which can be improved by identifying and eliminating them using six sigma. In the present work, DMAIC (Define, Measure, Analyze, Improve and Control) has been used to reduce the number of vehicle engine rejection. In define phase problem was defined by selecting the core issues concerned. In the measure phase data was col...

This study investigates single-machine due-date assignment and scheduling problems with a job-dependent aging effect under a deteriorating maintenance activity consideration simultaneously. The maintenance activity can be scheduled immediately after any one of the jobs has been completed. In order to model the problem more realistic, we assume that: (1) once the maintenance activity has been co...

This paper considers single-machine position-dependent weights scheduling problem with past-sequence-dependent delivery times and truncated sum-of-processing-times-based learning effect. The objective is to minimize the weighted sum of due date, number early jobs tardy jobs, where are weights. Under common slack date different assignments, optimal properties given, corresponding solution algori...

Abstract Opportune and accurate identification of Date pests during storage, is prerequisite for reducing pest damages having a good export. The present study aimed to define new sampling method three main storage Oryzaephilus surinamensis (Linnaeus), Ephestia kuehniella (Zeller) Plodia interpunctella (Hübner) in date Deiri Cultivar, by Spectrophotometer. experiments were conducted completely r...