Homework #1 Chapter 1 1

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Homework #1 Chapter 1 1.5.What is the purpose of a process plan? List the types of information normally included in the plan. 1.x. Define the term WIP (Work-in-Process) Chapter 2 2.2 Describe the typical decision levels in a production planning system and indicate the inputs and outputs at each level. 2.5 What is the difference between inventory position and on-hand inventory? 2.6 A product is produced in batches of 100 units. The machine requires 1 hour of setup time. Unit processing time is 10 minutes but the machine can process up to 5 units at a time. After processing, each unit must spend 2 hours on a cooling rack before it can be used. There is no limit to the number of units that can be cooled at a time. Assuming there is no additional waiting time for the machine, find the production throughput time for batches of this product. 2.9 It costs a development lab $250 to fabricate a prototype part. The normal learning curve is 90 percent. Estimate the unit variable cost after 1,000 items are produced. 2.15 In a stable system inventory averages $10,000,000. The company sells $35,000,000 per year. What is the average time product spends in the system? How many inventory turns are there per year Chapter 3 3.2 What is the difference between top-down and bottom-up forecasting? 3.5 Demand for the past four periods has been 104, 108, 105, 99. Estimate the initial value of the simple exponential smoothing statistic by averaging the historical data. Update the statistic using the four periods of data. What is your forecast for period 5? Use a smoothing factor of 0.2. 3.8 Annual shipments of glass food containers for the past decade are given in Table 3.5. Plot these data, hypothesize an appropriate model form, estimate the parameters, and forecast shipments for 1993 and 1994. 3.9 Quarterly shipments of glass food containers for the past three years are given in Table 3.6. Plot these data, hypothesize an appropriate model form, estimate the parameters and forecast for the next year. 3.11 Using the newsprint shipments in Table 3.4 , fit an first order autoregressive model of the form Dt = ? 0 + ? 1 Dt −1 + ? t . 3.17 Quarterly sales (in thousands of units) of a product over the last two years have been 26, 29, 30, 27, 28, 32, 33, and 30. Plot the data and forecast for the next period using Winter’s 3.18 In problem 17, assume sales for the ninth quarter turned out to be 32. Update your parameter estimates and forecast sales for period 10. Table 3.4 Newsprint Shipments Year 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Shipments 4234. 4735. 4526. 4674. 5065. 4927. 5115. 5310. 5415. 5515. 6007. 6152. 6464. 6396. Year 1983 1984 1985 1986 1987 Table 3.5. Annual Glass Beverage Shipments Shipments Year 60,108. 1988 64,302. 1989 59,935. 1990 62,795. 1991 62,673. 1992 Shipments 66,675. 67,973. 71,967. 74,683. 73,346. Table 3.6. Quarterly Glass Container Demand Year 1990 1991 1992 First Qtr. 17,446. 17,595. 17,785. Second Qtr. 17,748. 19,360. 18,338. Third Qtr. 18,971. 19,413. 19140. Fourth Qtr. 17,802. 18,315. 18,083.