文档介绍：Operations Scheduling
Operations Management
petitive Advantage
CHASE AQUILANO JACOBS
ninth edition
Chapter 15
Chapter 15 Operations Scheduling
Work Center Defined
Typical Scheduling and Control Functions
Job-shop Scheduling
Examples of Scheduling Rules
Shop-floor Control
Principles of Work Center Scheduling
Issues in Scheduling Service Personnel
Work Center Defined
A work center is an area in a business in which productive resources anized and work pleted.
May be a single machine, a group of machines, or an area where a particular type of work is done.
Capacity and Scheduling
Infinite loading (Example: MRP)
Finite loading
Forward scheduling
Backward scheduling (Example: MRP)
Typical Scheduling and Control Functions
Allocating orders, equipment, and personnel.
Determining the sequence of order performance.
Initiating performance of the scheduled work.
Shop-floor control.
Work-Center Scheduling Objectives
Meet due dates
Minimize lead time
Minimize setup time or cost
Minimize work-in-process inventory
Maximize machine utilization
Priority Rules for Job Sequencing
1. e, first-served (FCFS)
2. Shortest operating time (SOT)
3. Earliest due date first
4. Earliest start date first (due date-lead time)
5. Least slack time remaining (STR) first
Priority Rules for Job Sequencing (Continued)
6. Least slack time remaining (per operation as opposed to per job) first
7. Smallest critical ratio (CR) first
(due date-current date)/(number of days remaining)
8. Smallest queue ratio (QR) first
(slack time remaining in schedule)/(planned remaining queue time)
9. e, first served (LCFS)
10. Random order or whim
Schedule Performance Measures
Meeting due dates of customers or downstream operations.
Minimizing the flow time (the time a job spends in the process).
Minimizing work-in-process inventory.
Minimizing idle time of machines or workers.
Example of Job Sequencing: e First-Served
Answer: FCFS Schedule
Suppose you have the four jobs to the right arrive for pr