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把同一个系统用不同的软件建模,可以发现很多有趣的地方。
- x4 G. b# H7 j, `$ Q这是一个人力资源调度的小模型。: @) L# y# f0 {. E8 R, k4 }- y
按题目要求分别用ExtendSim和Arena建模,结果发现离开系统的实体数量有差异3个,参数和时间我已经检查过了,没有差异。已知Arena模型没有错,谁知道ExtendSim输出结果为何会有差别?难道是Shift里面的时间点设置有问题吗?
6 i. B; {- [$ w9 }8 e3 x) c题目:
* x6 p% _3 X; H. W* s# ZAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and # Q, h" ], M7 M! @ R4 q3 n! b
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
6 i/ A0 }% n7 M% V( ?activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll % {2 w7 O/ }9 s7 q9 c# D
assume the counter is large enough that any number of drivers can obtain and complete
9 V- {" d; I( M- o& Pthe form at one time.) The drivers then wait in line for an available photo clerk. ; W2 Q7 s8 W) b* b3 x
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to
6 c. ^. G6 Q Z0 }% Q8 D/ J; Z2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 4 m# H( f; C+ _8 z- X, Q
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when q+ C7 H/ L. I+ @% s
everyone else is busy and there are more drivers to be served. The manager works daily " D, h, x; s. p1 B5 |3 _
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, ) s f# W! q. ?& z" A- `. a" a
there are only 2 computers available at the facility. (Don’t worry about using sets for this . p8 g1 T/ M8 G/ Q4 ^, v) W
resource.) The computers are used to capture the driver’s signature and to print the , {" ]3 s4 E- X0 Q8 u
license. / H! [+ }2 ], |8 u# A
The process goes as follows: The clerk reviews the form with each driver, takes the
7 m. h) i8 ]2 g( ~( hdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A 4 U9 k( l q# x3 ?8 J
computer is needed for both the signature capture and for printing the license.) The DMV
( P6 @5 W$ b. d4 C3 Dmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as & e2 W* M: w0 L1 K+ H
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between 6 h& ^: o/ `4 N3 T* z
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly 1 o* o9 v0 ]* m0 H5 T$ T4 k
45 seconds to print and seal the new photo driver’s license. |
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