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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。
- Q- _5 h. o8 r. o+ _这是一个人力资源调度的小模型。) g$ R1 s3 k" K6 E( [: g* j
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?! m0 b0 V# r% w- I9 `, i; G3 S# L
题目:
6 L, E2 O9 L' E/ PAt the DMV photo license center, the current “rule of thumb” is to get the drivers in and 3 D: @8 d2 y6 X2 n
out as fast as possible. Therefore, when drivers come to get their photo ID, the following
+ D6 _* _/ H) N, ~$ ~activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll ) H" v& y7 D3 R3 p8 Y9 A
assume the counter is large enough that any number of drivers can obtain and complete
6 }5 K2 b0 d7 { V) F' d i1 xthe form at one time.) The drivers then wait in line for an available photo clerk. ; m0 |. W$ ~% @; d( K/ \
The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to ) W+ [1 i3 C1 k/ H" Z
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 6 M8 ~8 N" N- y* V7 K6 n
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when
, C7 g- N1 U$ a8 severyone else is busy and there are more drivers to be served. The manager works daily
' R2 I* @& W* q2 D8 _' Z9 J" p# J4 N- [like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, ) Q! h. U* }0 n) F* ?/ _9 ^$ v( ?
there are only 2 computers available at the facility. (Don’t worry about using sets for this
% A x1 _% Z; C( o6 O) k! bresource.) The computers are used to capture the driver’s signature and to print the
. O; y( m! z! d% e7 I, z, Y* mlicense.
: C# H, K% n% B$ U b- NThe process goes as follows: The clerk reviews the form with each driver, takes the " n8 b" K6 Z% Z3 w$ {& y- y
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A
+ A6 ]# v, F, V% Ucomputer is needed for both the signature capture and for printing the license.) The DMV
5 f) a; z4 T$ y$ o% C+ Jmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as * w2 e. r" Q5 D- j) P, \
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between # f0 J4 H) H, ^) D k
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly & ?9 h3 r& |2 R$ `
45 seconds to print and seal the new photo driver’s license. |
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