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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 c, ? R. G, R$ D: z% H
这是一个人力资源调度的小模型。
# _- M6 _6 @8 l1 C* {: Z: `- h6 R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?
7 Q/ V+ [; p/ ?. {) Z: ]" e题目:
! `/ \, ~- j/ n* WAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and 7 t: _- X" |0 N
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
: g: O; A: U- Pactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll ( C- w, F# V2 `9 H; D& u5 B% m; J
assume the counter is large enough that any number of drivers can obtain and complete
' X: Z: z3 e5 U/ D$ l6 h2 Pthe form at one time.) The drivers then wait in line for an available photo clerk.
" X! f8 U3 y: l! pThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 9 P k; N/ @2 L2 V: n
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break , a/ @/ n# U, t/ D
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when 8 \8 w4 G+ c, A
everyone else is busy and there are more drivers to be served. The manager works daily 2 ]. s3 G6 c. M5 R7 b; M
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
) D( A1 r" R) T# G+ @; Lthere are only 2 computers available at the facility. (Don’t worry about using sets for this : b1 Z! o7 @6 C/ g9 U# J; ]# _ e
resource.) The computers are used to capture the driver’s signature and to print the ) k" W( z& C4 \8 w# b6 }, y
license. 8 e* g; G* Q, @/ e) a/ |9 A
The process goes as follows: The clerk reviews the form with each driver, takes the - T: G' o5 U0 j3 B+ @
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
9 ]$ ~ ]7 O: q8 bcomputer is needed for both the signature capture and for printing the license.) The DMV
, y' i% F% T: fmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
4 g0 y7 r/ v+ m2 T% i) Blong as 4 minutes) to review the form and take a driver’s photo, and anywhere between 9 Q; E4 j) o+ t$ r1 ~
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
2 Y/ x8 _8 J$ P( N: A/ V45 seconds to print and seal the new photo driver’s license. |
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