Chapter 4: Supply and Demand Planning and Control

: Prepare a schedule starting at 9 a.m. for the following patients of Dr. Schafer:

Johnny Appleseed, a splinter on his left thumb.

Mark Borino, a new patient.

Joyce Chang, a new patient.

Amar Gavhane, 102.5-degree (Fahrenheit) fever.

Sarah Goodsmith, an immunization. T

Tonya Johnston, well-baby check-up.

JJ Lopez, a new patient.

Angel Ramirez, well-baby check-up.

Bobby Tool right, recheck on a sprained ankle.

Rebecca White, a new patient.

Doctor Schafer starts work promptly at 9 a.m. and enjoys taking a 15-minute coffee break around 10:15 or 10:30 a.m. Apply the priority rule that maximizes scheduling efficiency. Indicate whether or not you see an exception to this priority rule that might arise. Round up any times listed in the case study (e.g., if the case study stipulates 5 or 10 minutes, then assume 10 minutes for the sake of this problem).

Question: The SOT rule provides an optimal solution in some evaluation criteria. Should the manager of a bank use the SOT rule as a priority rule? Why?

Question: Why does batching cause so much trouble in workcenters?

Question: What job characteristics would lead you to schedule jobs according to “longest processing time first”?

Question: The following list of jobs in a critical department includes estimates of their required times:

What is the schedule?

What is the mean flow time?

What is the new schedule?

What is the new mean flow time?

Annual demand for a product is 13,000 units; weekly demand is 250 units with a standard deviation of 40 units. The cost of placing an order is \(100, and the time from ordering to receipt is four weeks. The annual inventory carrying cost is \)0.65 per unit. To provide a 98 percent service probability, what must the reorder point be? Suppose the production manager is told to reduce the safety stock of this item by 100 units. If this is done, what will the new service probability be?

Question: Compare and contrast JIT, MRP, and synchronized manufacturing, stating their main features, such as where each is or might be used, amounts of raw materials and work-in-process inventories, production lead times, and cycle times, and control methods.

Compare the importance and relevance of quality control in JIT, MRP, and synchronous manufacturing.

Discuss how a production system is scheduled using MRP logic, JIT logic, and synchronous manufacturing logic.

Discuss what is meant by forward loading and backward loading.