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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。# [2 v/ w$ D3 U" t/ e# b' t( F: b. r
这是一个人力资源调度的小模型。
- Y+ a4 s! a/ ~$ {5 ~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?
& S1 c" ?. R" z4 R5 \3 @+ _- w$ b) m, }题目:
% n* v) x7 k) q9 h- J( H xAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and ) |* w; L* Y- R, B7 @3 v \: Y
out as fast as possible. Therefore, when drivers come to get their photo ID, the following 6 q9 T) p0 D. X! \' `
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll & k. C0 J, z; s D3 A( Q! [2 b
assume the counter is large enough that any number of drivers can obtain and complete
- B: ^( \* E/ e; f1 }# dthe form at one time.) The drivers then wait in line for an available photo clerk. $ n9 C+ _0 P8 v1 F3 j
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 2 Q8 F, f1 \6 e
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break # o8 y% u+ ~. V" C! @
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
. U6 V5 ?2 l" ^3 c1 g5 Meveryone else is busy and there are more drivers to be served. The manager works daily , F) {2 L( b; D
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, ' T; `! m0 u7 r5 [5 g
there are only 2 computers available at the facility. (Don’t worry about using sets for this
! G3 Y7 U, M5 ]; B( [5 r; kresource.) The computers are used to capture the driver’s signature and to print the
. \: [" R- a: Y2 f; n# Q2 jlicense.
& E5 q& `7 Z9 C4 C2 AThe process goes as follows: The clerk reviews the form with each driver, takes the
4 F( Y: k* l3 u+ Qdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A 8 \5 L9 c9 [' |) s
computer is needed for both the signature capture and for printing the license.) The DMV
6 O6 f* J1 N4 x1 H, vmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
. f) `! B( w; ~* j& T' c# q8 olong as 4 minutes) to review the form and take a driver’s photo, and anywhere between
1 |0 c" v4 j& q3 |30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
6 F9 M; K) V) u3 \8 `45 seconds to print and seal the new photo driver’s license. |
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