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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。
3 `" v6 Q9 D; l+ k这是一个人力资源调度的小模型。* H/ [, f. }+ R
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?2 c/ V7 h( {0 C, V) B, R
题目:; B" j2 V. g1 F! u! S7 P1 S
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and
& d' a k! i3 A3 c1 Q, Nout as fast as possible. Therefore, when drivers come to get their photo ID, the following
3 W' I$ H% F1 y. a; Y) R7 H. d0 ?activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll
5 ^8 f+ N- [" e, L W+ { Eassume the counter is large enough that any number of drivers can obtain and complete
3 H- K7 \: b0 U$ O- I9 I/ G0 C" @the form at one time.) The drivers then wait in line for an available photo clerk. 5 U3 @+ p1 U* f# m
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 3 U7 X4 ?6 o/ A }% _; b
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
$ U2 \6 \' A* q' i; a$ nbetween 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
: S$ T" Z/ w, Q) O: n/ h, q1 Beveryone else is busy and there are more drivers to be served. The manager works daily
5 m9 p) C0 V, f |/ {( Flike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, 8 B: i3 W& |: F3 @0 d0 W# O
there are only 2 computers available at the facility. (Don’t worry about using sets for this
6 C- u' I4 W0 o. u4 j" yresource.) The computers are used to capture the driver’s signature and to print the
" ~8 x# [% P0 M/ S) o4 ?0 n8 Flicense.
+ Q" \5 G& ?5 H# A' L W ]The process goes as follows: The clerk reviews the form with each driver, takes the
8 q; b2 v, i: {" h; t {1 M4 adriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A * q* {. S1 a6 ~! }1 c
computer is needed for both the signature capture and for printing the license.) The DMV 0 p" \& l3 ~, `
manager knows that it normally takes 3 minutes (some as short as 2 minutes, others as
6 p1 L1 s1 |- O$ C# rlong as 4 minutes) to review the form and take a driver’s photo, and anywhere between
; {8 H4 U K; I& x* F; S8 ]30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
3 C8 ?$ {' J. X$ i1 s45 seconds to print and seal the new photo driver’s license. |
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