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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。
" Y: A2 f6 C- M1 K* U; u这是一个人力资源调度的小模型。
' L2 U; e0 Q$ e7 f( \- l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 Q4 E4 A9 R, y( n9 o% V
题目:2 b( u6 w, b; ^3 Q" ?+ G: i3 O
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and 5 R' _1 P8 Y$ B) G. I
out as fast as possible. Therefore, when drivers come to get their photo ID, the following + a d( D: V7 D+ L( k- d# K
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll 0 ~ B. u) x" X3 ?# X
assume the counter is large enough that any number of drivers can obtain and complete 3 {1 V7 ^9 D6 S& C( z
the form at one time.) The drivers then wait in line for an available photo clerk.
; W! E+ u) n3 U- x5 }* vThe drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to * E. F$ X5 w5 u# W" D. W u9 [/ Q, F
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break
3 E7 O6 C- @9 U! Cbetween 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
% b4 W& y% E. qeveryone else is busy and there are more drivers to be served. The manager works daily
6 t+ i* x1 ^ n# n/ D7 Slike Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, - }0 c; b) C* W* o; i( [
there are only 2 computers available at the facility. (Don’t worry about using sets for this / ~% C5 f4 }/ S7 v
resource.) The computers are used to capture the driver’s signature and to print the
3 Q# z+ a. }$ Rlicense. " Y5 d" e R0 z3 o: L( B
The process goes as follows: The clerk reviews the form with each driver, takes the
! ` H& ]* M$ [: q" J; udriver’s photo, captures the driver’s signature, and prints the completed license. (Note: A ; G' Y% r) E# t* C4 k! x5 ]/ g
computer is needed for both the signature capture and for printing the license.) The DMV
! k# y4 c; s% L! ]6 U6 ?* amanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as ; |( B# I/ y7 i: h+ z
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between
9 Z$ J. `% _, ]4 t% e" \30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly 0 Q( n: E2 `; d' `3 G- o" C7 i: y
45 seconds to print and seal the new photo driver’s license. |
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