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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。
- x8 y( q2 B/ X这是一个人力资源调度的小模型。# j$ t" K' \2 N8 X/ i1 l4 I, C
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?& _( V- R& S& E* O7 Y; ?
题目:5 C& q. k1 e! c) ^: M
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and 8 C$ w' G( d2 _5 }% f# {
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
7 f6 D6 |2 w& E9 pactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
5 Q! @. n# p! ?+ \ _% Dassume the counter is large enough that any number of drivers can obtain and complete
! G( d# F7 F, r# w: Mthe form at one time.) The drivers then wait in line for an available photo clerk.
$ p S3 @+ D3 p# ?- iThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to
: s% c* x: t4 ]/ n6 [2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 0 }+ ?# i( {0 o. F8 ?0 z
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
" }# z" V1 n/ ~" Ieveryone else is busy and there are more drivers to be served. The manager works daily 3 s) A2 x7 a7 r( ?: C$ `
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
9 D: n2 v+ [9 t$ w/ ~there are only 2 computers available at the facility. (Don’t worry about using sets for this
: L4 i$ L9 R9 h9 k- Q' ?) Nresource.) The computers are used to capture the driver’s signature and to print the ( A2 R$ d( C* T( a' Y
license. - s: r4 I8 w; a* `# i4 X
The process goes as follows: The clerk reviews the form with each driver, takes the
S' x3 a+ w3 C; C- a2 U, U" Bdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
" m% s& {/ F- `' ? o; zcomputer is needed for both the signature capture and for printing the license.) The DMV
- \3 {% j& ]8 ]# v hmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as 1 ^# d! ]1 O7 R/ K1 E- d5 a
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between % ?6 L O4 z# E! p$ n$ [6 y. s
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
* S" E% F y0 K( w8 [6 n- u6 ~45 seconds to print and seal the new photo driver’s license. |
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