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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。" ?: t8 V2 l7 p+ W; Y
这是一个人力资源调度的小模型。7 k$ Z( D0 X* U, c0 k0 r+ A; I
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?8 d3 b* P/ D8 s& c* a& S% I; v
题目:
* w5 f i# n a6 P2 d4 kAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and
3 u. \$ R7 c# b+ `( ~4 mout as fast as possible. Therefore, when drivers come to get their photo ID, the following 8 u7 A6 r3 F% t# Y3 V
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
$ L2 w. P0 E3 V Oassume the counter is large enough that any number of drivers can obtain and complete + U2 p. @. ?& l4 _* g) Y
the form at one time.) The drivers then wait in line for an available photo clerk. + w7 C. v3 N/ v, q$ d
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 9 I9 v: f9 r! |4 U
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
) I' s- K+ I- \6 \8 ?! {between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
+ j; s/ R0 `- W3 zeveryone else is busy and there are more drivers to be served. The manager works daily : w/ `. V( H# R4 Y! Q$ |
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, $ k# L" f* a) l) n
there are only 2 computers available at the facility. (Don’t worry about using sets for this - K {2 @- V- t' K; X/ j) g
resource.) The computers are used to capture the driver’s signature and to print the & A) t- k' w7 q( _7 g3 U0 v( {
license. % S* ?4 R+ H/ {6 p/ J' q
The process goes as follows: The clerk reviews the form with each driver, takes the
% f6 V' G! c- I" V. y% ]/ I% n) b7 Pdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
2 F! _0 P6 F5 ~computer is needed for both the signature capture and for printing the license.) The DMV ; a* u4 T7 C( m$ k3 x: E, h
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
( G1 k% `% x: Jlong as 4 minutes) to review the form and take a driver’s photo, and anywhere between
& D2 \5 h2 q! v30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly & W7 y% U0 o+ K% c( o q$ g
45 seconds to print and seal the new photo driver’s license. |
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