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ISYE 6644 Midterm 2 Questions and answers | Updated 2024/25 RATED A+
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ISYE 6644 Midterm 2 Questions and answers | Updated 2024/25 RATED A+
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ISYE 6644 Midterm 2 Questions andanswers | Updated 2024/25 RATED A+
Briefly explain the Create-Process-Dispose trio - Correct Answers Create: Periodically
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generate customer arrivals
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Process: Have work performed on the customers; maybe have to wait in line
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Dispose: Customers leave the system after service
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How do you access SMART demos - Correct Answers Libraries > Documents > Rockwell
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Software > Arena
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How do you add more advanced templates in Arena? - Correct Answers File > Template
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Panel > Attach
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Record Module - Correct Answers Collect statistics when an entity passes through the
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module
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What actions can you take in the Process module and what options can you set within
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these actions? - Correct Answers Delay
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Seize-Delay-Release
Seize-Delay
Delay-Release
You can set how many resources (workers) to Seize or Release
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What are advanced sets - Correct Answers Found in advanced process panel, used for
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crazy types of sets e.g. sets of sequences. Think of it as a vector
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What are attributes? - Correct Answers Each customer passing through the system has
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various properties (attributes).
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What are Blocks template? - Correct Answers They're sort of a self-contained language
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related to SIMAN, very specialized and low-level. Mainly used because certain blocks can
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only connect with these blocks (e.g. Queue -> Seize)
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What are different ways you can travel between stations? - Correct Answers Resource
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(e.g. an assistant) - Seize-Release
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Transporter (e.g. a car) - Request-Free, requires Distance Set ll ll ll ll ll ll ll ll
Conveyor - Access-Exit, requires a Segment Set ll ll ll ll ll ll
What are fake customers? - Correct Answers Used to accomplish various tasks during a
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sim e.g. calculate normal probabilities, keep track of time period, trigger breakdown
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, What are internal variables - Correct Answers Arena keeps track of and continuously
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updates lots of stuff as the simulation runs
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Examples:
TNOW (current sim time) ll ll ll
NR(Barber) - # of resource Barber's servers now working ll ll ll ll ll ll ll ll
NQ(Process 1.Queue) = # of customers in that queue ll ll ll ll ll ll ll ll
Create 1.NumberOut = # of customers who have so far left the module Create 1
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What are some "blocks"/modules in the top half of the Basic Process Template? - Correct
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Answers Create, Process, Dispose, Decide, Batch, Separate, Assign, Record
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What are some important Transfer Panel Modules and what do they do - Correct Answers
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Station - Somewhere you can go
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Route - Tells you where you're going. Similar to Connect except it takes time
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Enter - General way to get into a Station
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Leave - General way to depart a Station
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What are some lousy generators? - Correct Answers Random devices
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Random number tables ll ll
Mid-square method (square a number and take the middle parts) ll ll ll ll ll ll ll ll ll
Fibonacci and Additive Congruential Generators (Xi = Xi-1 + Xi-2)mod m) ll ll ll ll ll ll ll ll ll ll
What are some other really good combined generator? - Correct Answers L'Ecuyer with a
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cycle length of 2^191
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Matsumoto and Nishimura's Mersenne Twister with period of 2^19937 - 1 ll ll ll ll ll ll ll ll ll ll
What are some ways to handle different service times? - Correct Answers 1. Pre-assign
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the service times as an attribute in an assign module
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2. Use Assign to store each customer's arrival time as an attribute using TNOW
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3. Record departure times, allowing us to get average cycle times for any of the 3 types of
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parts
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or ll
Instead of assign module, wait until the Process module and use logical expression
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(x==y)=1 if x=y, 0 otherwise.
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E.g. (Entity.Type == Part A) * TRIA(1,3,4) + (Entity.Type == Part B) * WEIB(2.5,5.3)
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What are the desired properties of the algorithm that produces PRNs? - Correct Answers
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Output appears to be iid Unif(0,1)
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Very Fast ll
Ability to reproduce any sequence it generates
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What are the types of failures rules? - Correct Answers Ignore (complete service of
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current customer and reduce repair time)
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