ISYE 6644 Midterm 2 Questions With Explanations Of Answers.

What is process interaction? - correct answer Consider a generic customer (entity) and the sequence of events and activities (processes) it undergoes as it moves through the system. At any time the system may have many entities interacting with each other as they compete for resources. What is the template panel in Arena? - correct answer Where you get your "stuff" i.e. blocks, processes. Which options in the toolbar help with various visualization aids? - correct answer Arrange, Object, Window What does the Tools option in the toolbar have? - correct answer Lots of cool toys, including Input Analyzer, OptQuest, AVI capture, macros, etc What are some "blocks"/modules in the top half of the Basic Process Template? - correct answer Create, Process, Dispose, Decide, Batch, Separate, Assign, Record How do you add more advanced templates in Arena? - correct answer File > Template Panel > Attach What items are available in the bottom half of the Basic Process panel? What do they do? - correct answer Attribute, Entity, Queue, Resource, Variable, Schedule, Set They are spreadsheets that are both informational and allow us to change certain system parameters e.g. the Variable s/s defines global quantities such as WIP Briefly explain the Create-Process-Dispose trio - correct answer Create: Periodically generate customer arrivals Process: Have work performed on the customers; maybe have to wait in line Dispose: Customers leave the system after service What fields are in the Create module? - correct answer Name, Entity (Customer) Type, Time Between Arrivals, Entities per Arrival, Max Arrivals, First Creation What fields are in the Process Module? - correct answer Name, Type, Logic, Delay Type What actions can you take in the Process module and what options can you set within these actions? - correct answer Delay Seize-Delay-Release Seize-Delay Delay-Release You can set how many resources (workers) to Seize or Release What is the Resource spreadsheet? - correct answer A spreadsheet with a list of resources that the model is using. Can set capacity, which is the number of resource on duty. A resource is regarded as identical and interchangeable. Can create a new resource in the process module or the resource spreadsheet. What is the Schedule spreadsheet? - correct answer Can set schedules for servers. Enter schedule into duration box. Can also set schedule for arrivals e.g. in Create change Time Between Arrivals to schedule. What can an entity do at a Decide module? - correct answer 2-way by Chance N-way by Chance 2-way by Condition N-way by Condition What are attributes? - correct answer Each customer passing through the system has various properties (attributes). What are variables? - correct answer Unlike attributes, whose values are specific to each customer, variables are global. If changed, it gets changed everywhere e.g. WIP What can you do with an Assign module? - correct answer You can change attributes and variables e.g. entity pictures What is the Attribute Spreadsheet? - correct answer Keeps track of existing attributes that you might define in an Assign module What is the Variable Spreadsheet? - correct answer Pretty much the same as Attribute spreadsheet What is the Entity spreadsheet? - correct answer Allows you to set initial picture What are internal variables - correct answer Arena keeps track of and continuously updates lots of stuff as the simulation runs Examples: TNOW (current sim time) NR(Barber) - # of resource Barber's servers now working NQ(Process 1.Queue) = # of customers in that queue Create 1.NumberOut = # of customers who have so far left the module Create 1 What kinds of display information can you display while a simulation is running? - correct answer Clock, calendar, variable displays, histograms, graphs What does the batch module do - correct answer Combines multiple customers into one super customer. Type = permanent means customers will lose their identities What does separate do - correct answer Duplicates a single entity or split multiple entities that have been combined in a Batch module. If dealing with a permanent batch, usually use