Lab related questions (15 points in total):
- What is the function of create and dispose module in Arena? (2)
- True or false? Arena software consists of multiple levels of modeling. (1)
- List the default delay types for process module. Discuss the values required for each type.
(2) - What is status bar and where is it located in the Arena user interface? (2)
- Which area is known as model window in Arena? Arena has two different kinds of
views, what are they? (3) - The problem we solved at lab session with one resource (drill press). Change the delay
type to Weibull distribution with parameters β= 7.78 and α = 3.91. Run the simulation
and compare the result with the previous one. (5)
Lecture related questions (85 points in total): - Describe the steps in a simulation study. (5)
- Draw an event graph to describe the following events. If there are unnecessary events, please draw
a new event graph after deleting those unnecessary events. (6)
The occurrence times of E1 type events are assumed by using historical data in the initialization step.
The occurrence of E2 may cause the occurrence of E1 immediately. E2 may be scheduled after E3 with a
random delay. E4 may be scheduled immediately after E1. E3 may occur after E4 with a random delay. - True or False (14):
(1) Simulations usually output random results. It is mainly due to our lack of knowledge of the system. If
we have a very accurate and detailed model to describe the system, we could always gain constant
output.
(2) Arena software consists of multiple levels of modeling, from the low level that uses general-purpose
languages to the high level that offers application solution templates.
(3) The coin flipping model is a discrete model.
(4) An event graph could be used to identify necessary entities.
(5) Attributes are used to describe specific entities.
(6) State variables are used to describe the whole model.
(7) Number of entities in a model can change over the time in a simulation. - Name at least one type of entities, at least 3 attributes, 1 resource, necessary events and state
variables, input and output for the following systems:
(1) A grocery store: customers come to the store and will be served in a first-come-first-serve way. The
goal is to analyze average utilization of cashiers (15)
(2) Hospital emergency room: It has several ventilators for patients to use. The ventilators may be
working, or may break down sometimes and waiting for technicians to repair. The goal is to analyze the
average out-of-service time of the ventilators in the emergency room. (15) - What are the main features of discrete event system simulation? Please explain these features
using the example of single-server queue system simulation with excel we discussed in week3 lecture
as an example. (15)
Hint: the features were discussed in week2 lecture. The example of single-server queue system
simulation with excel is in week3: simulating with spreadsheets, Single server queue system.xls - In the loan application process simulation model we discussed in class, please describe the system,
its events, system status variables, and input data needed for running the simulation. (15)