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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。! |2 K+ K& I/ l5 y1 f
这是一个人力资源调度的小模型。9 y% j+ P- `2 [8 ^% N/ O. 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?6 I- y1 i$ F3 S& ]9 R
题目:1 _6 r! V: i# u! Y% K- l
At the DMV photo license center, the current “rule of thumb” is to get the drivers in and
7 B. @$ _' m+ H4 v( o% Yout as fast as possible. Therefore, when drivers come to get their photo ID, the following 0 P+ ]8 |! }; R- X r$ ^
activities occur: Drivers go to a large counter, pick up a blank form, and fill it out. (We’ll $ i: U5 }" r/ b. C! R* m% w
assume the counter is large enough that any number of drivers can obtain and complete
7 l* O# j: @+ y0 [* Y4 athe form at one time.) The drivers then wait in line for an available photo clerk.
% x' c/ b- P& _% p0 ^The drivers are serviced by: 1 part-time clerk (Rich) who works daily from 10 a.m. to 8 I; ^" l0 i. Q. z1 w
2 p.m., 1 full-time clerk (Ann) who works daily from 8 a.m. to 5 p.m. with an hour break 2 |2 Z) y1 K$ i! N" A# O N
between 10:30 a.m. and 11:30 a.m., and the site manager (Dina) who only helps when * I; M* S" g/ `
everyone else is busy and there are more drivers to be served. The manager works daily 8 y& b. `0 R( X4 m( e3 [7 o
like Ann, but gets her break from 1:15 p.m. to 2:15 p.m. Due to budgetary constraints, ! S% \3 U6 p' q: U% F( n* G
there are only 2 computers available at the facility. (Don’t worry about using sets for this * F1 i$ }/ h# L) Y
resource.) The computers are used to capture the driver’s signature and to print the ( ?% r# s) R1 T4 T8 Y, N0 s
license.
# |! }0 a9 i# U$ f7 vThe process goes as follows: The clerk reviews the form with each driver, takes the / U3 I) }1 u& y
driver’s photo, captures the driver’s signature, and prints the completed license. (Note: A 7 @: P- ~7 W7 b
computer is needed for both the signature capture and for printing the license.) The DMV
3 z; b2 \8 C3 |( Xmanager knows that it normally takes 3 minutes (some as short as 2 minutes, others as 9 B7 L9 t( n. Q" ?+ e
long as 4 minutes) to review the form and take a driver’s photo, and anywhere between ' N, h" o' q* Z7 _& J
30 and 60 seconds to capture the driver’s signature electronically. It then takes exactly
~3 ?& I2 [; k; L: `# b45 seconds to print and seal the new photo driver’s license. |
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