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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。
# D1 Q* g- m& Q8 g9 v/ C这是一个人力资源调度的小模型。$ P- j' }( Z# w. j1 T! 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?' d# N) ~% V! o/ ~. U
题目:
4 M1 C2 N; `4 ]. pAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and * U2 j, u8 T4 V3 _! S" R( m; k: ^
out as fast as possible. Therefore, when drivers come to get their photo ID, the following ' G+ |: u" j3 u. \
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll / I7 J3 H3 e ~4 ~
assume the counter is large enough that any number of drivers can obtain and complete
% e- b6 z i3 }9 o0 I8 Bthe form at one time.) The drivers then wait in line for an available photo clerk. 7 K; g6 l* D& W9 ]* J
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to : N, y5 ?: P+ a) | S$ V
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 1 R* H7 ?* P, o0 d- L3 b: B* ~
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
5 l G! ]6 z6 r, E/ Q3 J5 ceveryone else is busy and there are more drivers to be served. The manager works daily
4 n6 M- m# x, y5 w1 m5 xlike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, " S/ ]9 v/ R$ a m4 c+ k' x% {
there are only 2 computers available at the facility. (Don’t worry about using sets for this 6 a! q8 ` w& ~# {4 K
resource.) The computers are used to capture the driver’s signature and to print the
3 I, d5 K) }+ P0 u3 Hlicense. 0 @2 i9 Z; {- C% g
The process goes as follows: The clerk reviews the form with each driver, takes the . `) E( q0 V: L! Y' `6 t
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
0 }7 ~8 n+ r0 ?1 C& J+ Vcomputer is needed for both the signature capture and for printing the license.) The DMV
/ C3 V, i' L" E* Emanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as ! K: W7 @ m& P4 i- ?$ x+ p H
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between
" M/ O2 V& r2 ]6 z& |9 X! h0 \30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
) q- t2 C5 \1 X45 seconds to print and seal the new photo driver’s license. |
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