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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。
; m6 D# @6 u( `! U( |9 y# @这是一个人力资源调度的小模型。
) F, _( ^ P7 l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 @0 c8 O7 l2 E$ D7 X9 i
题目:
: k' c% r+ N% {& i/ HAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and
4 }; ]# Y' T) Vout as fast as possible. Therefore, when drivers come to get their photo ID, the following
5 i6 p$ N) v4 U9 y( H7 D7 factivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
$ l2 L+ G: J/ W6 ~, Z0 J9 d4 Wassume the counter is large enough that any number of drivers can obtain and complete . O, E9 Y& c9 o
the form at one time.) The drivers then wait in line for an available photo clerk.
2 }2 c" k; o7 x5 f6 c+ eThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to W$ G7 A& a' Z5 ?
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break & }( |! A' s0 E# @( T( f
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
* ~, h4 J4 N) e, R: B- feveryone else is busy and there are more drivers to be served. The manager works daily 6 m8 c2 ]4 f+ A, {. Z# x C$ }
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
: Q* O" `8 l/ T+ z; R% J; Ithere are only 2 computers available at the facility. (Don’t worry about using sets for this
) l% `3 ?# [6 l' tresource.) The computers are used to capture the driver’s signature and to print the ) j8 w6 C* |, k# N, R0 J
license. ' m8 v! H' `: V& P7 Y
The process goes as follows: The clerk reviews the form with each driver, takes the 3 Z+ K( @5 x& V& D c
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A # [/ I3 n7 i) P) H, s6 r( H( S7 W
computer is needed for both the signature capture and for printing the license.) The DMV
* Q* d$ r8 F3 t) s3 d' g6 [+ omanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
; R& U& ]% O5 Ylong as 4 minutes) to review the form and take a driver’s photo, and anywhere between 7 [3 ?0 I7 F. {* E$ u+ z: M
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
2 H6 {) g9 Z/ N, h( x+ T' o45 seconds to print and seal the new photo driver’s license. |
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