ISYE6644 Simulation Midterm 2 -Exam.pdf

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What is the name of Arena's primary modeling approach "world view"? A) Process-Interaction B) Event-Scheduling C) Continuous Modeling Flowchart D) Mixed Modeling E) Event-Interaction - ANSWER-A) ... Process Interaction What sequence of Arena modules would you use to generate customer arrivals, use a server , and then have customers leave the system after they're done with the server? - ANSWER-Create-Process-Dispose (ARENA) TRUE or FALSE? A Create module allows you the use a variety of customer interarrival time distributions. - ANSWER-TRUE (ARENA) What is Seize-Delay-Release? - ANSWER-Grab at least one resource (server), spend time getting served, and then free the server for the next customer. If you seize and the server isn't available, you may have to wait in a queue. (ARENA) What is a seize-delay? - ANSWER-Grab at least one resource and spend time getting served. Remember to release the server sometime later, else he gets deadlocked and a giant line will form. (ARENA) What is a delay-release? - ANSWER-Use a previously seize'd for a while, and then free him for the next guy to use. (ARENA) Which of the following action sequences can you find in a Process module? A) Delay B) Seize-Delay C) Delay-Release D) Seize-Delay-Release E) All of the above - ANSWER-all of duh abuv (ARENA) TRUE or FALSE? A process is generally considered to consist of both a resource and its associated queue. - ANSWER-TRUE (ARENA) TRUE or FALSE? You can change the number of servers on duty (i.e., the capacity) for a resource using the Resource spreadsheet. - ANSWER-TRUE (ARENA) TRUE or FALSE? You can a queue discipline from FIFO to LIFO with one click by using the Queue spreadsheet. - ANSWER-TRUE Which property is not desirable for a good pseudo-random number generator? (a) The numbers must appear to be Unif(0,1). (b) The numbers be approximately independent. (c) We should be able to generate the PRNs very, very quickly. (d) We must be able to look up the series of PRNs from a table. (e) We can reproduce any sequence of PRNs if called upon to do so. - ANSWER-(d) We must be able to look up the series of PRNs from a table. What is a random device? - ANSWER-Considered a lousy generator, nice randomness properties. However, Unif(0,1) sequence storage is tough so it's tough to repeat experiment. An example is flip a coin or least significant digits of atomic clock What is a random number table? - ANSWER-It is a lousy random number generator that used to be used in like the 1950s, lots of digits supplied in tables. What is the mid-square method (J. von Neumann) for random number generation? - ANSWER-Idea: Take the middle part of the square of the previous random number. Its pretty shitty and it tends to degenerate (all results end up being 0 at some point when you are iterating) Which of the following PRN generators aren't very good? a) Generators involving physical devices such as coin flips or least significant digit readings from an atomic clock. b) Random number tables. c) von Neumann's mid-square method. d) Fibonacci and additive congruential generators. e) All of the above. - ANSWER-e) All of the above. [Show More]

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