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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。# `5 b% X, W- k6 a d
这是一个人力资源调度的小模型。
3 \: j6 b/ m: v- L7 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?, O2 P" b1 S! {- u {
题目:. z6 y2 _4 F0 U# c8 h6 G8 J
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and ' {4 V e' S3 i8 A1 D& p, {
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
, H/ _: M9 d, I' L8 q; F7 Y8 Q) w2 Jactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll 9 h' v3 ^' E4 `! Y
assume the counter is large enough that any number of drivers can obtain and complete
6 i2 d [# G, }- y3 ?the form at one time.) The drivers then wait in line for an available photo clerk. ) f( F5 z- o0 r7 t
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to
: b# g6 k) e1 ?( R2 J2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 4 _ k, S5 C3 K' a) Z3 j1 k0 ^3 x
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when 3 Q4 s. \9 ^0 \. f
everyone else is busy and there are more drivers to be served. The manager works daily 3 p. V* p# R$ k U3 p$ B6 ~
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, . x1 T+ f& c" P" r2 d
there are only 2 computers available at the facility. (Don’t worry about using sets for this
5 T, h: k" K3 tresource.) The computers are used to capture the driver’s signature and to print the 2 c1 S/ G; G; T- W7 [ o4 s0 X
license. ) c' y( E& i' s2 K6 [1 F
The process goes as follows: The clerk reviews the form with each driver, takes the ; ^4 o: V6 y9 m% d: x5 H$ D
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
- x8 N$ [6 j* I2 {computer is needed for both the signature capture and for printing the license.) The DMV 5 a4 ] Z: |/ m- O
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
! M; a" z7 m7 s, r$ c1 r+ x3 Ulong as 4 minutes) to review the form and take a driver’s photo, and anywhere between
) p& i- e5 _9 S30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly C' Y5 S. Q9 Z' p
45 seconds to print and seal the new photo driver’s license. |
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