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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。
$ w! I# _% Z. @! I* B5 }/ c这是一个人力资源调度的小模型。
& |2 C$ E o, h& D/ z8 Z. c* t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?
: h8 G. R; w% ^7 T7 V6 F题目:+ V. M3 q+ m: f. A! E; `
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and . p$ J; O* u9 [7 Y
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
) ^# {6 P0 U5 H& y# vactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
9 s; Q" A. c$ h% A6 n* Y) R; ?5 oassume the counter is large enough that any number of drivers can obtain and complete
0 z& v2 F* J1 g, d# C6 _the form at one time.) The drivers then wait in line for an available photo clerk. ) Q3 [2 G& {/ q. T
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to
* N) Q2 E8 S3 Z+ r" V6 O2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break " p4 A. o6 \, A& j, Q) y7 E
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
* z8 p( a, l* ?, ]everyone else is busy and there are more drivers to be served. The manager works daily
( x: |! b0 u) xlike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints,
; m3 e9 U4 N: S9 Hthere are only 2 computers available at the facility. (Don’t worry about using sets for this
2 C& K' I2 S4 D! P6 X0 M9 \resource.) The computers are used to capture the driver’s signature and to print the
" F! X( T2 |, o' glicense. ; X) _& X) T: G! E8 L0 A+ H+ b% B- Q) x
The process goes as follows: The clerk reviews the form with each driver, takes the
) c' k. `6 E& n$ {" l3 Xdriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
7 B, r Z, k, x0 ?; {. E& K0 o7 M8 qcomputer is needed for both the signature capture and for printing the license.) The DMV - c$ v, o2 T8 b
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as + R) R B& ?! h6 w4 z. s8 l
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between * `6 B! \. L! X% y c2 j6 C
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
* K2 c; K1 C! L1 C45 seconds to print and seal the new photo driver’s license. |
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