|
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。
0 X4 D5 d$ j$ y& g, A. e这是一个人力资源调度的小模型。
/ L6 w7 H, w$ q s' u. ]* R+ J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?
2 p- b2 m6 e2 i4 e题目:+ j" Z# l1 P2 F8 H: Q" x1 X N
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and ( A3 w0 o/ Y. y2 y" N. B( q9 [
out as fast as possible. Therefore, when drivers come to get their photo ID, the following - @* T! H7 l& L* ?2 R$ x
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
; m9 S1 ?6 v% m- o7 }4 uassume the counter is large enough that any number of drivers can obtain and complete
5 `) D: V9 G0 X3 S" v. `0 E' tthe form at one time.) The drivers then wait in line for an available photo clerk. # M: d, I3 H, J$ G% x
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to ' x1 [8 u" u7 h$ y
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break ; F9 W' y; C! L' P
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when % b+ z) [8 X* v2 o7 s
everyone else is busy and there are more drivers to be served. The manager works daily
8 Z! ?* Z& [& ~; ]like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, $ m4 ]6 g- n' e4 T | [5 M
there are only 2 computers available at the facility. (Don’t worry about using sets for this ) l; w) {: C+ O7 a8 n
resource.) The computers are used to capture the driver’s signature and to print the 3 u6 J8 m6 Y. l$ r: R
license.
3 B: s9 i5 @+ P$ s; r6 |& @% E6 GThe process goes as follows: The clerk reviews the form with each driver, takes the
- u. v5 x0 M) y% mdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
+ e* t% S' }& U$ J5 R; ^. |computer is needed for both the signature capture and for printing the license.) The DMV ) e2 e" d. k2 ?- c, y
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
; ]; z; m2 D1 @) Z/ p$ {long as 4 minutes) to review the form and take a driver’s photo, and anywhere between
O* m- V4 ^/ ~2 n0 f30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
) D5 G; F7 l" O9 s: q45 seconds to print and seal the new photo driver’s license. |
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?注册
x
|