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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。( d7 _0 D/ ?# T7 v; S/ m
这是一个人力资源调度的小模型。. {' G& R+ Q+ } H# v7 Z
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?
4 p4 y' Q; F4 e题目:
z$ D& l# `4 S& H* |+ v: V! I( ?At the DMV photo license center, the current “rule of thumb” is to get the drivers in and - T. _+ [+ E4 p! X# j- A
out as fast as possible. Therefore, when drivers come to get their photo ID, the following $ W& U9 p: @$ e4 n& B
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll # S* _6 X8 u) ~) {# B
assume the counter is large enough that any number of drivers can obtain and complete 4 m% T6 _' [& R! x8 p
the form at one time.) The drivers then wait in line for an available photo clerk.
- g. m9 r8 k1 t& d) B3 FThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to
' P9 V9 {5 |6 r/ u) S+ p* Y- E2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 6 p2 N6 D! Y; R o6 f" U
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
# s2 n" K, W* ?& ?everyone else is busy and there are more drivers to be served. The manager works daily 5 o) d! ?! T$ h. L' C
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, 3 j% g0 z) J( t+ E8 k8 R
there are only 2 computers available at the facility. (Don’t worry about using sets for this ' \8 `2 M" H j/ G7 A3 Q: a) a5 W
resource.) The computers are used to capture the driver’s signature and to print the & r9 R4 ]/ v" x! l$ q
license. ; }1 S7 w9 z% u$ k
The process goes as follows: The clerk reviews the form with each driver, takes the
, ^5 I- m/ A, R5 ~& E6 \: }; `driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
& }' G% }. g( N4 Tcomputer is needed for both the signature capture and for printing the license.) The DMV
1 `/ ]9 p" W4 I# t& kmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as ( U( x6 P/ x6 e& F0 d( e
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between
: I, K# l; X) A7 T4 ^( H30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly ' J: W& W7 T0 Z& F' p' Z; M
45 seconds to print and seal the new photo driver’s license. |
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