This paper is concerned with assessing the impact that scheduling can have on the performance of semiconductor wafer fabrication facilities. The performance measure considered here is the mean throughput time (sometimes called cycle time, turnaround time or manufacturing interval) for a lot of wafers. A variety of input control and sequencing rules are evaluated using a simulation model of a re...

Traditionally,machine scheduling research is concernedwith the sequencing of tasks on one machine or on several parallel or different machines, subject to a set of constraints. Over the years, researchers have studied a huge variety of problems, developing numerous heuristics, approximation and exact algorithms, and complexity results. Some of these problems are interesting because of their int...

scheduling is an important subject of production and operations management area. in flow-shop scheduling, the objective is to obtain a sequence of jobs which when processed in a fixed order of machines, will optimize some well defined criteria. the concept of transportation time is very important in scheduling. transportation can be done by robots. in situations that robots are used to transpor...

This thesis deals with the development of mathematical models and algorithms for optimizing refinery crude-oil operations schedules. The problem can be posed as a mixed-integer nonlinear program (MINLP), thus combining two major challenges of operations research: combinatorial search and global optimization. First, we propose a unified modeling approach for scheduling problems that aims at brid...

Contention scheduling (Cooper & Shallice 2000) is a wellknown action selection mechanism in cognitive science. It can account for normal action sequencing of daily routine actions in humans as well as for various errors exhibited by impaired human subjects. In this paper, we examine the potential of contention scheduling as an action selection mechanism for artificial agents, in particular robo...

Nowadays, nurses scheduling is one of the most important challenges with which health care centers are encountered. The significance of nurses’ work quality has led researchers to be concerned about scheduling problems, which have an impact on nurses’ performance. Observing the interests of hospital and patients, providing their satisfaction, and meeting their needs are among the main objective...

Suppose that we wish to solve such sequencing problems as the flow shop scheduling problem or the traveling salesperson problem. This paper reports computational experiments that shed light on how large a problem we might be able to solve, assuming that our work is done using a spreadsheet-based approach and the conventional hardware and software available to today's undergraduate student: a la...

-This paper describes the design, development and results from a high fidelity human-in-the-loop simulation of an integrated set of trajectory-based automation tools providing precision scheduling, sequencing and controller merging and spacing functions. These integrated functions are combined into a system called the Terminal Area Precision Scheduling and Spacing (TAPSS) system. It is a strate...

A Job-Shop Scheduling is a process–organized manufacturing facility. Its main characteristics are that a great diversity of jobs is performed. A Job-Shop produces goods (parts) and these parts have one or more alternatives process plans. Each process plan consists of a sequence of a operations and these operations require resources and have certain (predefined) duration on machines. The Job-Sho...

The scheduling of activities to transport oil derivative products through a pipe network is a complex combinatorial problem that presents a hard computational solution. During the scheduling horizon, many batches are pumped from (or pass through) different areas. Pipes are shared resources. The balance between the demand requirements and the production campaigns, while satisfying inventory mana...