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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。/ n/ }6 w, T% R$ Q7 W
这是一个人力资源调度的小模型。
! A: K; k* q1 A' I5 T6 [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?# C! C! @) ]- Y- i. T2 ]
题目:1 U, t2 n6 p, [0 k/ F& f! f
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and
9 V; G0 v0 C1 R5 `: N r9 f( bout as fast as possible. Therefore, when drivers come to get their photo ID, the following
, s0 l3 I3 \+ c. I% T; [. Lactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll % F2 U% M5 G! R3 O. p
assume the counter is large enough that any number of drivers can obtain and complete
. ~; ^3 M- {" p" L) I1 q0 [- othe form at one time.) The drivers then wait in line for an available photo clerk.
) Q- A1 N4 T, F/ U1 qThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to * R6 `9 i ^5 B& z6 `) e
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
W- K H# D' {, ?between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
* {/ q G, `+ ueveryone else is busy and there are more drivers to be served. The manager works daily
" U! T) \- M- W% T/ r+ r1 Z0 [like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
6 g9 B; \ t+ _2 x3 \4 q' O0 mthere are only 2 computers available at the facility. (Don’t worry about using sets for this ' P3 r6 x9 [" T- n+ A! a' I" O( L
resource.) The computers are used to capture the driver’s signature and to print the + O i6 x; F2 V- Q" S5 }- g9 J
license.
7 f' q i/ Z4 Q) P3 S% W$ qThe process goes as follows: The clerk reviews the form with each driver, takes the
; P' [% ]; R2 Z1 _0 `* q& B: Cdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
7 V/ J4 I, |! ^$ Y* _computer is needed for both the signature capture and for printing the license.) The DMV 0 P' w1 p$ J; C; @, U! M' T* v7 i
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
1 n& W% ~1 U8 P9 N+ Klong as 4 minutes) to review the form and take a driver’s photo, and anywhere between
( }5 n% g1 Z- {% T5 J30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly ; P& Z. P! @' q: J7 E
45 seconds to print and seal the new photo driver’s license. |
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