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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。* L- S. e3 y' A6 O7 w! a* t/ m! w0 v0 q
这是一个人力资源调度的小模型。/ W# F, g& m. O) w1 a' P+ Z
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?0 e q1 C; Z- J' ~
题目:
! F" O* |6 v" P" W2 C3 F" [! F# DAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and
/ i5 W9 Y' }9 b3 z, N/ w$ Lout as fast as possible. Therefore, when drivers come to get their photo ID, the following 8 o$ _4 o5 G" f& i# d. G5 _
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll 4 ?% b% j; @( ]" L: i
assume the counter is large enough that any number of drivers can obtain and complete : X: Y; T, F4 s9 G5 V* I/ b, z/ K m
the form at one time.) The drivers then wait in line for an available photo clerk. 9 }/ I, {" m' m- I
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 5 _. }* F. r6 d; H& x8 ~- a/ t; S
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 6 p+ n( a8 v$ [, g& d, ?) E; t
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when 0 p' F; H1 O4 ]+ @1 p# D
everyone else is busy and there are more drivers to be served. The manager works daily
8 b) P4 r: ?! i6 }6 u5 L" z Y) ulike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
( U7 W( L8 z+ a5 v* ~ A# ~" pthere are only 2 computers available at the facility. (Don’t worry about using sets for this
3 D# w5 v, A* o. C0 hresource.) The computers are used to capture the driver’s signature and to print the h, p) W2 {& R; W; `; C% v
license. " {7 _" L1 C7 d) \
The process goes as follows: The clerk reviews the form with each driver, takes the s" c' H) N" `0 a; h% a
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A ' W$ W6 h7 e7 ?& V
computer is needed for both the signature capture and for printing the license.) The DMV
) X2 G3 ]8 t$ o1 Z) ~" I' p Rmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as K+ L, r+ T ~/ P9 ?# D
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between 6 C) n5 {% R: h- X: \4 s* @ ~
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
2 o3 a7 D( [$ x$ l4 f& L45 seconds to print and seal the new photo driver’s license. |
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