|
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. q2 Y1 l9 Y/ t1 [
这是一个人力资源调度的小模型。
- G) F7 R. U6 [# t S0 Y& }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?
0 O& |$ ~% E6 V3 ^. N题目:5 b# p/ X( ]+ M8 H! ?. H3 Q- ?
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and
" F6 B3 p) G3 e' s2 {! ~+ oout as fast as possible. Therefore, when drivers come to get their photo ID, the following
* ~$ k6 S( ^7 iactivities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll 6 {, h8 T' F! X* l% P$ L
assume the counter is large enough that any number of drivers can obtain and complete 0 q7 v! Q0 R- u+ J; r) J
the form at one time.) The drivers then wait in line for an available photo clerk.
( U' s9 W, M: L* a5 R; _5 G1 QThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to
3 i( s% M/ c; {0 B2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break * p1 U# {6 ^( X* x
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when 1 e# q& j5 S0 o. O% @' @+ l# E5 U
everyone else is busy and there are more drivers to be served. The manager works daily
t, i7 d& \6 G* Mlike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, & H; J I6 ?) P" n" E
there are only 2 computers available at the facility. (Don’t worry about using sets for this ; t1 K. Q( T; o* r1 r, R
resource.) The computers are used to capture the driver’s signature and to print the
3 `: z7 |8 \- E5 u2 wlicense.
5 s* c7 S% K: v# \8 [( SThe process goes as follows: The clerk reviews the form with each driver, takes the 8 z, \% ~$ \$ R- ]7 F4 Y
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A ; `- A6 b) [+ r% P3 \; G
computer is needed for both the signature capture and for printing the license.) The DMV
; }0 s% L6 y+ h9 |. M, Gmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as , Q$ u' b6 f8 g" {9 j3 k
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between
" n: [( r) ~" Y4 ]* K1 z& t30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
5 g8 Z8 U$ M' k# t Z' V H45 seconds to print and seal the new photo driver’s license. |
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?注册
x
|