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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。' v4 `3 J" o$ u: x R) K
这是一个人力资源调度的小模型。/ n4 C; T, N: b 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?: x2 j. O _8 g2 y9 Q- w
题目:# n6 k1 G5 Y1 a! q7 U1 X
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and ( K1 ^' u, K% d# U8 l
out as fast as possible. Therefore, when drivers come to get their photo ID, the following + O, S9 C$ V* w/ q( b+ t8 m' J
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
# _. l2 i- O- n# k) z& Q% p- r5 Sassume the counter is large enough that any number of drivers can obtain and complete
; Q# A6 J& p# H, g, ]- o, W/ Wthe form at one time.) The drivers then wait in line for an available photo clerk. ) I# K/ v# i: v$ \6 I. H
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 8 W4 v# ]( C& e+ b; ]$ {8 P
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break : _- J7 K% d& r& G7 o# \3 ?9 T; M
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when $ |( e* i( Q8 ]8 W) \
everyone else is busy and there are more drivers to be served. The manager works daily & T( g7 w$ x; V; ?7 K9 `: j
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
7 x4 | H2 ~! Ethere are only 2 computers available at the facility. (Don’t worry about using sets for this
) J, v6 ?1 w4 e) Y1 k% L7 ?resource.) The computers are used to capture the driver’s signature and to print the
# }6 X. p' W/ A9 x& N( i/ rlicense.
0 P- e3 x: v4 z" `The process goes as follows: The clerk reviews the form with each driver, takes the
$ c" g/ j& @* N/ b2 adriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A 4 ?. [1 ^2 l4 y2 f
computer is needed for both the signature capture and for printing the license.) The DMV ( f7 M5 o: l9 _ y1 m
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
6 v( A/ t1 \% A+ R0 h$ ilong as 4 minutes) to review the form and take a driver’s photo, and anywhere between $ y; C) \4 t% r0 Q1 z* [6 _
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly " n1 _5 R. z1 \ Z! W
45 seconds to print and seal the new photo driver’s license. |
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