resource limitation in zero time may cause to some profitable projects not to be selected in project selection problem, thus simultaneous project portfolio selection and scheduling problem has received significant attention. in this study, budget, investment costs and earnings are considered to be stochastic. the objectives are maximizing net present values of selected projects and minimizing v...

this paper considers the economic lot scheduling problem, that is, the problem of scheduling several products on a single facility so as to minimize holding and setup costs. combination of frequency and timing as well as production quantity make this problem np-hard. a heuristic is developed to obtain a good solution to elsp. the proposed heuristic makes use of the simulated annealing technique...

data grid is an infrastructure that controls huge amount of data files, and provides intensive computational resources across geographically distributed collaboration. the heterogeneity and geographic dispersion of grid resources and applications place some complex problems such as job scheduling. most existing scheduling algorithms in grids only focus on one kind of grid jobs which can be data...

Shop floor level operations planning significantly affect the production system performance. Traditionally, in a production system, maintenance planning and production scheduling have been considered and optimized independently. However, these two aspects of operations planning do have an interaction effect on each other and hence need to be considered jointly for improving the system performan...

High-Variety, Low-Volume (HVLV) manufacturing systems are built to produce parts of several types in small quantities and under multiple production objectives. They relate to job-shop systems well known by researchers. One of the most studied assumptions of HVLV systems scheduling is considering that machines may be periodically unavailable during the production scheduling. This article deals w...

When firms operate in a make-to-order environment, they must set due dates (or lead times) which are both relatively soon in the future and can be met reliably in order to compete effectively. This can be a difficult task, since there is clearly an inherent tradeoff between short due dates, and due dates that can be easily met. Nevertheless, the vast majority of due date scheduling research ass...

This paper addresses the Hybrid Flow Shop (HFS) scheduling problems to minimize the total work-in-process inventory. Job scheduling problems are one of the oldest and real world combinational optimization problems. It is multi objective and complex in nature. There exist some criteria that must be taken into consideration when evaluating the quality of the proposed schedule. Consideration of jo...

BACKGROUND In Canadian hospitals, which are typically financed by global annual budgets, overuse of operating rooms is a financial risk that is frequently managed by cancelling elective surgical procedures. It is uncertain how different scheduling rules affect the rate of elective surgery cancellations. METHODS We used discrete event simulation modelling to represent perioperative processes a...

Scheduling is an important process widely used in manufacturing, production, management, computer science, and so on. Appropriate scheduling can reduce material handling costs and time. Finding good schedules for given sets of jobs can thus help factory supervisors effectively control job flows and provide solutions for job sequencing. In simple flow shop problems, each machine operation center...

The main contribution of this work is to apply tabu search based algorithms for solution of scheduling of jobs in CMS environment. An attempt has been made in this work to vary the job sequencing so that optimal sequencing of jobs can be achieved. The idea behind this work is to perturb sequences in the search of better results. More the number of sequences higher will be the degree of the opti...