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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。- L8 Y A; A, Q
这是一个人力资源调度的小模型。& ?& o. V3 N* o* _0 G i1 o
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?
5 i7 W. m3 ~ f2 d5 Q$ N$ v题目:
& z( U' B9 G% z" ZAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and
$ n' q# b+ ^7 [) l" _out as fast as possible. Therefore, when drivers come to get their photo ID, the following * a- m# h$ h4 t' `! K8 E
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
* }3 I# }* j3 I) s+ `& w0 H6 N9 N1 Dassume the counter is large enough that any number of drivers can obtain and complete ' l7 G" ?% |" L
the form at one time.) The drivers then wait in line for an available photo clerk. , r; i" N, M5 F6 F. \
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 0 O- }7 f% Z/ r5 S; U( y
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
$ W% B+ _+ [$ c0 zbetween 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
- v% U6 A7 [0 p' A& ? heveryone else is busy and there are more drivers to be served. The manager works daily - i3 n3 Q7 Q7 O/ U5 Z6 `, G
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
( T7 @( }3 r W, ?* ]# [there are only 2 computers available at the facility. (Don’t worry about using sets for this 4 Y9 _7 X2 i% M. w* f! h
resource.) The computers are used to capture the driver’s signature and to print the - h5 I+ h- Z2 q# U
license. , S$ K1 [, ~3 c+ u2 t
The process goes as follows: The clerk reviews the form with each driver, takes the
1 N9 e. v8 K! V% e+ X- \! g. ddriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A ( R" P+ W- @ X: ^
computer is needed for both the signature capture and for printing the license.) The DMV
' ]! z% ]- h- U ?( Xmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
! H! K6 f* d: m( B. E$ D, w2 b5 ?long as 4 minutes) to review the form and take a driver’s photo, and anywhere between 2 @/ L0 b/ O R$ C4 B2 ~
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
; @0 W: B" r# P; `$ k( J% J1 S45 seconds to print and seal the new photo driver’s license. |
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