An introduction to simulation modeling of resource-sharing activities with the concept of the Sequence Step Algorithm.

1. (V) Resource-Sharing Activities 1
RESOURCE-SHARING ACTIVITIES
IN REPETITIVE PROJECTS
Model and schedule resource-sharing activities
for the Sequence Step Algorithm
Presented by
Chachrist Srisuwanrat
2008

2. (V) Resource-Sharing Activities 2
4. RESOURCE-SHARING ACTIVITIES
 Activities sharing one or more
resources, called “resource-sharing
activities”
 “Shared Resources”
 How to schedule shared resources?
 What could be the problems?

3. (V) Resource-Sharing Activities 3
Examples of Repetitive Projects with
Resource-Sharing Activities

4. (V) Resource-Sharing Activities 4
Considerations When Scheduling
Resource-Sharing Activities
 Need to collect CIT and determine CLT
• In which sequence step?
 Need to delay resources’ arrival dates to eliminate
idle time
• Can the idle time in shared resources be eliminated?
 Need to allocate shared resource to activities
• Which resource-sharing activity gets the shared
resource first?
 Imposing CLT might change:
• CIT for the shared resource itself and of other resources
• Working sequences for the shared resource?
Supplementary Presentation V

5. (V) Resource-Sharing Activities 5
Scheduling Resource-Sharing Activities
 When using SQS-AL to schedule repetitive projects with
resource-sharing activities, schedulers must pay
attention to:
• Increasing idle time from SQS to SQS
• Changes in work sequence for shared resources
• Slow production rates of dependents between the
resource-sharing activities
• Precedence relationships between resource-sharing
activities (e.g., direct or indirect)
• Proximity of start dates for resource-sharing activities
• Effect of assigning CLT on their dependents

6. (V) Resource-Sharing Activities 6
(a) Determine CLTXY in SQS2
(b) Determine CLTXY in SQS3
In Which SQS? (SQS2 or SQS3)
Activities X and Y share the
same Resource ResXY.

7. (V) Resource-Sharing Activities 7
Can the idle time in shared be
eliminated?
(a) Determine CLTXY in SQS2 (b) Determine CLTXY in SQS4

8. (V) Resource-Sharing Activities 8
(a) Using two dedicated resources (b) Introducing a work break
(c) Speeding Activity B (d) Lowering Activities X and Y
Solutions for shared resources when their idle time cannot be eliminated

9. (V) Resource-Sharing Activities 9
Does the working sequences
change after assigning CLT?