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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。. J8 d. Z% w/ f" e+ i5 t. x
这是一个人力资源调度的小模型。
: ~+ h$ [ i6 J5 P. q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?' Q: d; d2 Q5 _8 V# S
题目:7 e7 P- }) L* }
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and
5 q x; ~* I! @. t; nout as fast as possible. Therefore, when drivers come to get their photo ID, the following
7 x+ }8 _; `+ i. dactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll $ y; X" g" S6 P! G( R
assume the counter is large enough that any number of drivers can obtain and complete # o. n7 h* g1 Q' {5 f8 z
the form at one time.) The drivers then wait in line for an available photo clerk. 6 _3 d9 Q. L6 H5 ?4 J
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to ; q u* Z# U0 N
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
( m* M( G7 f; f' i0 {between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
. r+ k& d1 b' `% V# J7 D. C# Weveryone else is busy and there are more drivers to be served. The manager works daily
, r$ [0 K1 `" ]! k6 W8 u3 F# glike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, & p" g3 d& k, |; l
there are only 2 computers available at the facility. (Don’t worry about using sets for this
# z; h( s2 t e% ^0 O8 Oresource.) The computers are used to capture the driver’s signature and to print the
- I" A. z9 ~& [( Dlicense.
; G# U8 j* X; VThe process goes as follows: The clerk reviews the form with each driver, takes the 1 C3 ^4 K& Z. i1 O) H
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A 4 N4 v' I: A; A) o- @- S
computer is needed for both the signature capture and for printing the license.) The DMV 6 x k# N4 H$ i. D0 M
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
$ Y$ ^' q& {* L2 B$ Q# `long as 4 minutes) to review the form and take a driver’s photo, and anywhere between " A# ?- [+ f( l9 P7 u
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
2 x A2 c8 T! [45 seconds to print and seal the new photo driver’s license. |
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