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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。
1 R* U3 G& i O6 S- U这是一个人力资源调度的小模型。; H% _' Z; q: W: O6 @
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?+ G* ^4 A/ {! b6 R8 k$ x$ d9 W. t
题目:$ c. g3 Q/ [8 u# l, e; X
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and & G9 p- }. g1 V5 h2 p+ i' e) n" [
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
! ~5 k3 p+ D% X7 dactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
6 E! c: W; ~3 f' r1 ?assume the counter is large enough that any number of drivers can obtain and complete # x& ~: H" `; L
the form at one time.) The drivers then wait in line for an available photo clerk. # R$ D8 K0 w: y' w. Q. y. q" `
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to * C! A) \( Y" a. S, g/ n
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
5 }( o" }$ w! z8 r- ?- ]between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when ( M, ]: E3 z& {5 \! p2 S' J
everyone else is busy and there are more drivers to be served. The manager works daily
4 `& P9 Y2 }4 plike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
( ^0 {4 v& j# F: ^% ^0 p3 Ythere are only 2 computers available at the facility. (Don’t worry about using sets for this
8 N, T9 f1 T3 p. z! k* g3 `* Dresource.) The computers are used to capture the driver’s signature and to print the ! K; [8 Q: m$ j
license.
' ?- x* _4 p0 S, H$ f ]6 z1 n5 @The process goes as follows: The clerk reviews the form with each driver, takes the
' ]- v) L/ Y, s' Z7 l" g" n E) Udriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
/ Q$ b$ d% c- n- L0 C7 K1 ]% K tcomputer is needed for both the signature capture and for printing the license.) The DMV 8 A$ q* N5 g& Z/ \' s3 a/ X) }
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
- J5 E) ?: S+ h) J* ]: ]# plong as 4 minutes) to review the form and take a driver’s photo, and anywhere between
, t. b# u6 [( ?6 A" v30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
- }7 z* h# `1 ^9 x _* f45 seconds to print and seal the new photo driver’s license. |
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