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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。, Z% A8 x! y! `/ r, Z( m) R5 {1 E
这是一个人力资源调度的小模型。
* K, w/ q5 E5 B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?" S# f5 X0 l- {' U5 o! t! l
题目:( Q5 Q0 Y/ J3 z; ]' h i
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and / t0 C& x5 h) b; \5 H/ k
out as fast as possible. Therefore, when drivers come to get their photo ID, the following . f( X. e" o- f- }( @
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll 2 B2 S+ N% T& T8 P1 b( z: I
assume the counter is large enough that any number of drivers can obtain and complete - e$ o8 G9 ^+ H! R; C1 U
the form at one time.) The drivers then wait in line for an available photo clerk. 0 y9 t6 V! z, R) h" G; D
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to ( o0 @+ A* p0 k' ?/ {2 K* X
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 3 S/ Z R1 u# j' z& C. X
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
8 b! H) O+ j- ?* ]2 ^9 p* o0 _everyone else is busy and there are more drivers to be served. The manager works daily
2 v R! ~4 U$ _ p8 Y% ~like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, ; M( w' \7 `4 A) b+ z. V
there are only 2 computers available at the facility. (Don’t worry about using sets for this
, _+ U: Z5 o: E& c! Jresource.) The computers are used to capture the driver’s signature and to print the
: z# g; t8 X' l, S7 Q. V3 Jlicense. ( G" J% l4 }7 ~$ i8 B# ^
The process goes as follows: The clerk reviews the form with each driver, takes the
& ^' k# M! ^. g2 |driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
/ m% ?0 J( Y: tcomputer is needed for both the signature capture and for printing the license.) The DMV . Z$ j& ?# d9 z2 l
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as / U7 [' v5 s/ T3 A f4 b& ~1 n
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between ! A3 n# x& t L. r4 P. l- `4 p% w
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly : G. o: Z7 A3 Y, f
45 seconds to print and seal the new photo driver’s license. |
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