Questions
The following gives the number of pints of type A blood used at Woodlawn Hospital in the past 6 weeks.
The following gives the number of pints of type A blood used at Woodlawn Hospital in the past 6 weeks.
| WEEK OF | PINTS USED |
|---|---|
| August 31 | 360 |
| September 7 | 389 |
| September 14 | 410 |
| September 21 | 381 |
| September 28 | 368 |
| October 5 | 374 |
a. Forecast the demand for the week of October 12 using a 3-week moving average.
b. Use a 3-week weighted moving average, with weights of .1, .3, and .6 using .6 for the most recent week. * Then, forecast demand for the week of October 12.
c. Compute the forecast for the week of October 12 using exponential smoothing with a forecast for August 31 of 360 and a=.2
In: Other
A horizontal force of P = 56kN is applied to joint C. Each pin has a diameter of 25 mm and is subjected to double she...
A horizontal force of P = 56kN is applied to joint C. Each pin has a diameter of 25 mm and is subjected to double shear.
Determine the average shear stress developed in pin Aof the truss.
In: Other
Consider again that the company making tires for bikes is concerned about the exact width of its cyclocross tires
Consider again that the company making tires for bikes
is concerned about the exact width of its cyclocross tires. The
company has a lower specification limit of 22.8 mm and an upper
specification limit of 23.2 mm. The standard deviation is 0.15 mm
and the mean is 23 mm. The company now wants to reduce its defect
probability as 0.01. To what level would it have to reduce the
standard deviation in the process to meet this
target?
In: Other
George Kyparisis owns a company that manufactures sailboats. Actual demand for George's sailboats during each of...
George Kyparisis owns a company that manufactures sailboats. Actual demand for George's sailboats during each of the past four seasons was as follows:
| Season | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Winter | 1,440 | 1,240 | 1,000 | 960 |
| Spring | 1,500 | 1,440 | 1,640 | 1,540 |
| Summer | 1,000 | 2,100 | 2,040 | 2,000 |
| Fall | 640 | 750 | 670 | 520 |
George has forecasted that annual demand for his sailboats in year 5 will equal 6,500 sailboats.
Based on the given data and using the multiplicative seasonal model, the demand level for George's sailboats in the spring of year 5 will be _______ sailboats (enter a whole number).
In: Other
An axial flow fan 1.83 m diameter is designed to run at a speed of 1400 rev/min with an average axial air velocity of 12.2 m/s
An axial flow fan 1.83 m diameter is designed to run at a speed of 1400 rev/min with an average axial air velocity of 12.2 m/s. A quarter scale model has been built to obtain a check on the design and the rotational speed of the model fan is 4200 rev/min. Determine the axial air velocity of the model so that dynamical similarity with the full-scale fan is preserved. The effects of Reynolds number change may be neglected.
A sufficiently large pressure vessel becomes available in which the complete model can be placed and tested under conditions of complete similarity. The viscosity of the air is independent of pressure and the temperature is maintained constant. At what pressure must the model be tested?
In: Other
What is the economic production quantity?
Race One Motors is an Indonesian car manufacturer. At its largest manufacturing facility, in Jakarta, the company produces subcomponents at a rate of 305 per day, and it uses these subcomponents at a rate of 12,700 per year (of 250 working days). Holding costs are $3 per item per year, and ordering costs are $31 per order.
a) What is the economic production quantity? 561.21 units (round your response to two decimal places).
b) How many production runs per year will be made? 22.63 production runs (round your response to two decimal places)
c) What will be the maximum inventory level? 467.71 units (round your response to two decimal places).
d) What percentage of time will the facility be producing components? 16.66 % enter your response as a percentage rounded o two decimal laces
e) What is the annual cost of ordering and holding inventory? $ 701.57 (round your response to two decimal places)
In: Other
(Yoggo Soft Drink) A small, privately owned Asian company is producing a private-label soft drink, Yoggo....
(Yoggo Soft Drink) A small, privately owned Asian company is producing a private-label soft drink, Yoggo. A machine-paced line puts the soft drinks into plastic bottles and then packages the bottles into boxes holding 10 bottles each. The machine-paced line is com-prised of the following four steps: (1) the bottling machine takes 1 second to fill a bottle, (2) the lid machine takes 3 seconds to cover the bottle with a lid, (3) a labeling machine takes 5 seconds to apply a label to a bottle, and (4) the packaging machine takes 4 seconds to place a bottle into a box. When a box has been filled with 10 bottles, a worker tending the packaging machine removes the filled box and replaces it with an empty box. Assume that the time for the worker to remove a filled box and replace it with an empty box is neg-ligible and hence does not affect the capacity of the line. At step 3 there are two labeling machines that each process alternating bottles; that is, the first machine processes bottles 1, 3, 5, . . . and the second machine processes bottles 2, 4, 6, . . . . Problem data are sum-marized in the table following.
a. What is the process capacity (bottles/hour) for the machine-paced line?
b. What is the bottleneck in the process?
c. If one more identical labeling machine is added to the process, how much is the increase in the process capacity going to be (in terms of bottles/hour)?
d. What is the implied utilization of the packaging machine if the demand rate is 60 boxes/ hour? Recall that a box consists of 10 bottles.
In: Other
Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently...
Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 3150, and the previous request was at cylinder 1805 (Hint: this indicates the reading head's moving direction). The queue of pending requests, in FIFO order, is:
3511, 2332, 2800, 3192, 658, 1296, 1918, 1356, 5936, 2527
Starting from the current head position, what is the total distance in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms?
a. FCFS
b. SSTF
c. SCAN
d. LOOK
e. C-SCAN
f. c-LOOK
In: Other
The actual demand for the patients at Omaha Emergency Medical Clinic for the first 6 weeks of this year follows:
The actual demand for the patients at Omaha Emergency Medical Clinic for the first 6 weeks of this year follows:
| WEEK | ACTUAL NO. OF PATIENTS |
|---|---|
| 1 | 65 |
| 2 | 62 |
| 3 | 70 |
| 4 | 48 |
| 5 | 63 |
| 6 | 52 |
Clinic administrator Marc Schniederjans wants you to forecast patient demand at the clinic for week 7 by using this data. You decide to use a weighted moving average method to find this fore-cast. Your method uses four actual demand levels, with weights of 0.333 on the present period, 0.25 one period ago, 0.25 two periods ago, and 0.167 three periods ago.
a) What is the value of your forecast?
b) If instead the weights were 20, 15, 15, and 10, respectively, how would the forecast change? Explain why.
In: Other
Brine (specific gravity 1.20) is flowing through a standard 80-mm pipe at a maximum rate...
Brine (specific gravity 1.20) is flowing through a standard 80-mm pipe at a maximum rate of 0.9 m3/min. In order to measure the rate of flow, a sharp-edged orifice, connected to a simple U-manometer is to be installed. The maximum reading of the manometer is to be 400 mm Hg. What size orifice should be installed? Repeat, assuming a venturi meter is used instead of an orifice.
In: Other
Consider a production line with five stations. Station 1 can produce a unit in 9 minutes....
Consider a production line with five stations. Station 1 can produce a unit in 9 minutes. Station 2 can produce a unit in 10 minutes. Station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. Station 4 can produce a unit in 5 minutes. Station 5 can produce a unit in 8 minutes. Which station is the bottleneck station?
In: Other
What is the optimal order quantity and the minimum annual cost for Bell Computers to order, purchase, and hold these integrated chips?
Bell Computers purchases integrated chips at $350 per chip. The holding cost is $34 per unit per year, the ordering cost is $121 per order, and sales are steady at 400 per month. The company's supplier, Rich Blue Chip Manufacturing, Inc., decides to offer price concessions in order to attract larger orders. The price structure is shown below .
| Rich Blue Chip's Price Structure | |
|---|---|
| Quantity Purchased | Price/Unit |
| 1-99 units | $350 |
| 100-199 units | $325 |
| 200 or more units | $300 |
a) What is the optimal order quantity and the minimum annual cost for Bell Computers to order, purchase, and hold these integrated chips?
The optimal order quantity after the change in pricing structure is ______units (enter your response as a whole number).
The total annual cost for Bell computers to order, purchase, and hold the integrated chips is ________(round your response to the nearest whole number).
b) Bell Computers wishes to use a 10%
holding cost rather than the fixed $37 holding cost in part a. What is the optimal order quantity, and what is the optimal annualcost?
The optimal order quantity after the change in the holding cost calculation is ______units (enter your response as a whole number).
The total annual cost for Bell computers to order, purchase, and hold the integrated chips is ________round your response to the nearest whole number).
In: Other
Thomas' Bike Shop stocks a high volume item that has a normally distributed demand during the reorder period.
Thomas' Bike Shop stocks a high volume item that has a normally distributed demand during the reorder period. The average daily demand is 70 units, the lead time is 4 days, and the standard deviation of demand during the reorder period is 15.
a. How much safety stock provides a 95% service level to Thomas?
b. What should the reorder point be?
In: Other
Calculate D in rectangular coordinates at point P(2, -3, 6) produced by
D3.2. Calculate D in rectangular coordinates at point P(2, -3, 6) produced by: (a) a point charge QA-55 mC at Q(-2, 3, -6); (b a uniform line charge ?ρLB 20 mC/m on the x axis; (c) a uniform surface charge density ρsc 120 μC/ m" on the plane z =-5 m.
In: Other
4-8. The load of 800 lb is supported by the four 304 stain- less steel wires...
The load of 800 lb is supported by the four 304 stain-less steel wires that are connected to the rigid members AB and DC. Determine the angle of tilt of each member after the load is applied. The members were originally horizontal, and each wire has a cross-sectional area of 0.05 in2.
In: Other