Subject- Optimization Techniques Q) The Stone River Textile Mill was inspected by OSHA and found to be
Question:
Subject- Optimization Techniques
Q) The Stone River Textile Mill was inspected by OSHA and found to be in violation of a number of
safety regulations. The OSHA inspectors ordered the mill to alter some existing machinery to
make it safer (e.g., add safety guards); purchase some new machinery to replace older, dangerous
machinery; and relocate some machinery to make safer passages and unobstructed entrances
and exits. OSHA gave the mill only 8 weeks to make the changes; if the changes were not made
by then, the mill would be fined $100/week of late finishing.
Activity | Description | Normal duration (in weeks) | Normal cost (in $) | Crash Duration (in weeks) | Increment in cost ($) on per week reduction |
1-2 | Order new machinery | 3 | 50 | 2 | 50 |
1-3 | Determine safety changes | 5 | 140 | 4 | 60 |
1-4 | Receive Equipment | 2 | 50 | 1 | 30 |
2-3 | Hire new employees | 5 | 100 | 2 | 40 |
3-5 | Make changes in the existing machinery | 4 | 100 | 2 | 70 |
2-5 | Install new machinery | 7 | 115 | 5 | 30 |
4-5 | Conduct employee safety orientation | 2 | 55 | 2 | ----- |
(a) Determine the normal duration and total cost of the project.
(b) Determine the project schedule and total cost of completing the project in 9 weeks.
(c) Is it economical to compress the schedule beyond 9 weeks? Justify.
(d) What is the minimum cost at which project can be completed?
(e) What is the minimum duration of the project with the minimum cost obtained in part (d)?
Operations Management Creating Value Along the Supply Chain
ISBN: 978-0470525906
7th Edition
Authors: Roberta S. Russell, Bernard W. Taylor