MT1_514_F06_sol

MT1_514_F06_sol - ISE 514 GEZA BOTTLIK MIDTERM SOLUTION...

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ISE 514 Fall 2006 GEZA BOTTLIK MIDTERM SOLUTION 09/28/06 Problem No. 1 The forecasts and orders for a product are given in the table below for 12 months. The usual MPS quantity is 250 units. The lead-time is 3 periods. What must the minimum initial inventory be so that no late orders will result? Fixed order fence is 3 periods. What will you tell the customer if that customer wants to order 60 units to be delivered in period 6? Why? What actions will you have to take if you accept the order? (15 points) The first available MPS is in period 3 due to the lead time. If we have that receipt, our table look like this: Period Initial Inv 1 2 3 Forecast 80 70 80 Orders 90 80 75 POH -90 -170 5 MPS 250 So we need 170 for the initial inventory. Completing the record: Period Initial Inv 1 2 3 4 5 6 7 8 9 10 11 12 Forecast 80 70 80 80 70 70 80 70 80 90 70 70 Orders 90 80 75 78 69 72 58 58 76 35 25 0 POH 170 80 0 175 95 25 203 123 53 223 133 63 243 MPS 250 250 250 250 The ATP in period 6 is 250 – 72-58-58 = 62, so we can accept the order . If we accept the order, we will have to move the receipt from period 9 to 8 Period Initial Inv 1 2 3 4 5 6 7 8 9 10 11 12 Forecast 80 70 80 80 70 70 80 70 80 90 70 70 Orders 90 80 75 78 69 132 58 58 76 35 25 0 POH 170 80 0 175 95 25 143 63 243 163 73 3 183 MPS 250 250 250 250 Many of you assumed that you were in week 1, instead of zero and came up with 245 for the inventory. If we continue from that point, the ATP in week 6 is negative and we would have to add a receipt in that week to accept the order. Also remove the receipt in period 7 and add one in 9 from 10. Problem No. 2 The processing times and due dates for each job in a shop are: Job 1 2 3 4 5 6 Type A A A A B B Processing time 6 3 4 3 4 3 Due date 12 14 16 9 17 19 Page 1 Period Initial Inv 1 2 3 4 5 6 7 8 9 10 11 12 Forecast 80 70 80 80 70 70 80 70 80 90 70 70 Orders 90 80 75 78 69 72 58 58 76 35 25 0
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ISE 514 Fall 2006 GEZA BOTTLIK MIDTERM SOLUTION 09/28/06 The type refers to the penalty (as a function of completion time) that is assessed the job. Type A is the tardiness and Type B is the absolute value of the lateness. Sequence the jobs to minimize the
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This note was uploaded on 10/08/2010 for the course ISE 514 taught by Professor Bottlik during the Fall '08 term at USC.

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MT1_514_F06_sol - ISE 514 GEZA BOTTLIK MIDTERM SOLUTION...

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