Went over Page 733 Problem 4 & 5 see lecture notes in mgmt840 section of thumb drive for answers (10-4-2010.xls)

It may be useful to utilize tables of known values so that Excel sheets do not become confusing•

Went over Learning Curves 2nd

This is a number usually under 1•If this is true T(n) = T(1)*n^b•

2^(b)= L○

B = log(L)/log(2)○

T(2n)/T(n) = L (where L is learning curve)•

Reality may not exactly fit the model•

T(2n)/T(n) = constant (where T = time of production of n units)

Went over homework third…. see lecture notes in mgmt840 section of thumb drive for answers (10-4-2010.xls)

Went over Page 86 Problem 5 next: see homework assignment Went over Problem 6 from Page 86 next, as a class member had a question about it.

2 components, one is the standby for the other.

You need to multiply .2 (the failure chance) by .2

.2*.2=0.04

Formula is =P(A fail) * P(B fail)

Went over the following problem from Quiz 2 Went over PowerPoint lectures 5-8

Chapter 5 Lecture

Similar production is done over and over (flow-shop)○

In a job shop Volume is high and Variety is low•

Projects are more specific then the flow-shops•

Flow-Shop○

Project○

Batch○

More training

Job-Shop○

Assembly-Line○

5 types of productions•

IE: Rate of Ford cars is 20/hour R = 20/hr (Throughput) Cycle time is 1/20 (ie: 1 every 3 minutes)

○

L (length in the line) L = 100 cars○

W (weight) W = L/R = 100/20 = 5 hours○

Little's Law is Weight * Rate = Length•

Sometimes increasing utilization is not the best goal•

Performance Measures○

See things that you may not have seen before○

If the process is important create the flowchart!!!○

These are the standard symbols of flow charts

○

Makes everything easier to understand○

A storage area between stages where output of a stage is placed prior to being used in a downstream stage

□

Buffer -

Occurs when the activities in a stage must stop because there is no place to deposit the item

□

Blocking -

Occurs when the activities in a stage must sop because there is no work

□

Starving -

Bottleneck-

There can be several stages or one stage○

Flowcharts help truly understand everything about a project•

Cycle Time:200 parts per day, 8 hour day

8/200=0.04 0.04 *60 = 2.4 per minute

Flowchart Example (from Las Vegas Example in Chapter 5)

MIDTERM WILL BE OPEN BOOK!!!In-Class Lecture 10/4/2010Tuesday, September 21, 201011:29 PM

Lecture Notes 10-4-2010 Page 1

there is no place to deposit the item

Occurs when the activities in a stage must sop because there is no work

□

Starving -

Stage that limits the capacity of the process□

Bottleneck-

Not made until you order it○

Customizable○

Make to order•

IE: supermarket, goods are stocked on shelves and you buy them if you want them

○

Make to stock•

Total average value of inventory Sum of the value of raw materials, work-in-process, and finished goods inventory

○

Inventory = flow time * Throughput rate (make sure to match units)•

Cost of goods sold divided by the average inventory value•

Inventory turns•

Inverse of inventory turns scaled to days•

Days-of-supply•

There is a long-term relationship between inventory, throughput, and flow time

•

Inventory = Throughput rate X Flow time•

Little’s law•

See PowerPoint 5 for a good example of Little's Law on Slides 15-26•

Measuring Process Performance:

Lecture Notes 10-4-2010 Page 2