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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。
% }% s. T" s% E" g/ L这是一个人力资源调度的小模型。) B! K) Y6 H9 b- K3 `# k
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?
. O/ N6 h: \9 u6 R7 `/ C- H% y1 f* P. A题目:
6 r. i8 Y: X) Y6 Q6 y+ H' g% A% i. gAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and
& Y: q1 A( n* \5 o3 _) Dout as fast as possible. Therefore, when drivers come to get their photo ID, the following 2 D; ?9 s9 G/ l" [
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
8 P) l/ I. L( p6 c! |$ Passume the counter is large enough that any number of drivers can obtain and complete 8 T; I: T; W% o+ b
the form at one time.) The drivers then wait in line for an available photo clerk.
" w* s7 |8 B# R' o( v3 `The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to # {, k" J- S" h0 D7 S7 \
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 4 ~1 M1 _! Y3 k8 r7 \5 X
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
4 \) c( h0 m1 t9 q8 g' i+ T& ~everyone else is busy and there are more drivers to be served. The manager works daily
7 e+ W6 |/ r" n6 b' Slike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, " D9 e; N2 q9 @" c9 o+ A' J* h
there are only 2 computers available at the facility. (Don’t worry about using sets for this 1 a$ q A2 S4 a) F8 W) K8 Y1 H: U8 i
resource.) The computers are used to capture the driver’s signature and to print the ) @5 \! G/ r& Z6 f" V6 T+ m
license.
" r/ U o8 p# k6 I' N, ?' b; tThe process goes as follows: The clerk reviews the form with each driver, takes the 4 d6 W" a* d. E' _, H8 s6 n
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
$ ~2 G. }+ X" `9 \5 v) @+ Wcomputer is needed for both the signature capture and for printing the license.) The DMV $ _/ [+ t( G8 G
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
. ?" K3 V& U. \long as 4 minutes) to review the form and take a driver’s photo, and anywhere between " J- n: z% o8 Z
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly % z8 d2 g" D% ^% m8 `& ?
45 seconds to print and seal the new photo driver’s license. |
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