Questions tagged [simulation]
For questions related to the use of computer models to estimate performance measures for complex systems, typically under uncertainty.
19
questions
0
votes
1answer
44 views
lsqcurvefit error in simulation of demands in MATLAB
I want to simulate the demand of a factory. This is not a real problem, the demand follows this relation $D= AB^2C^3$ where $A$, $B$ and $C$ have normal distributions: $$A\sim N(10,2.5),\quad B\sim(6,...
2
votes
0answers
22 views
Are there standard symbols to describe discrete event simulations (DES)
I just wonder, whether there is a good reference for the symbols used in a flow chart to describe a DES process. I am looking for something like Kendall notation, but with a reference to the symbols.
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3
votes
1answer
78 views
To calculate the time needed for a vacuum robot to cover whole area
A vacuum robot runs on randomized direction when it is operating in a room.
I want to know how long it takes to fully cover the whole area (or at least most part of the area) with given information:
...
1
vote
1answer
86 views
How to generate data for test?
I am working on the following problem:
I have a scheduling problem with time-varying capacities and other characteristics that are not treated in classic Job Shop or Flow Shop.
How to generate such ...
3
votes
0answers
20 views
Is this the same as Agent Based DES or something different?
DES (Discrete Event Simulation) is a simulation paradigm which can be applied to some OR problems, if combined with SO (Simulation Optimisation).
AB-DES (Agent-Based DES) is an adaptation where the ...
8
votes
2answers
77 views
Alternatives for real-world data collection in simulation courses for Fall 2020
I teach a discrete-event system simulation course in Fall 2020. As with most DES simulation courses, students have term projects that involve gathering real-world data and building stochastic input ...
5
votes
2answers
708 views
Monte-Carlo Simulations in inventory management
I am using Monte-Carlo simulations in Microsoft Excel to determine optimum reorder points and safety stock levels. I have the demand patterns of the last one year of the product. Using that I can ...
1
vote
1answer
116 views
Model Simulation in PYOMO
I have an optimization model that I have developed within the PYOMO framework and I am unable to solve the model in a reasonable amount of time using the BARON solver. I have been instructed not to ...
3
votes
1answer
102 views
In Linear programming, how to determine if shadow price does not change linearly?
As the title says, in linear programming, is there a way to determine that the shadow price does not change linearly for a resource?
I understand one way is to simulate but is there a way to tell ...
6
votes
0answers
42 views
DOE Output Versus Testing Against Baseline
I am doing some output analysis on a discrete event simulation model and trying to interpret the results. My first step was to run the baseline model to get the response variable, let's say it's 10 ...
6
votes
1answer
91 views
How to decide the hiring headcount for a retail department
The job responsibility is exactly the same in the department.
The department has a total number of working hours required.
The total retention is about 50% a year, and the hiring cost is about $2000 ...
10
votes
1answer
1k views
Simulation in Python
What is the most common package for discrete-event simulation in the OR community?
I have found SimPy package.
13
votes
2answers
481 views
Simulation optimisation: Monte carlo simulation, regression, optimise within regression model?
Can you help me identify if this technique has a standard name to help me explore the literature?
Suppose I have a black-box stochastic simulation parameterised by $X=[x_1,...,x_p]$ with some single ...
14
votes
5answers
2k views
Good textbook for queueing theory and performance modeling
Can someone recommend a good self-study textbook for queueing theory and performance modeling? My interest is in applying this to understanding the behavior of some real-world server networks, ...
21
votes
5answers
2k views
Validation and verification of mathematical models
Within the subject of simulation I have found some literature on validation and verification (e.g. Sargent's paper). My question is, what techniques do you use to validate and verify your mathematical ...
4
votes
2answers
307 views
Queuing models in R, $\lambda$ Little
It's noted that the number of folks in a stationary system will maintain an average equal to the rate of arrival multiplied by the mean of the service distribution.
The formula $L = \lambda w$ is ...
22
votes
4answers
2k views
OR-backed serious games
A "serious game" is a game (usually a simulation) designed for a primary purpose other than pure entertainment. Games like the beer game or the fresh connection can be considered serious games serving ...
14
votes
4answers
275 views
Good distribution assumptions for customer demand in a supply chain
Why do we normally assume normal distribution/Poisson distribution for customer demand in a supply chain? Are there other good distribution assumptions?
11
votes
1answer
229 views
How to fit a Beta distribution to three estimates from an “expert”?
I'm modeling a process time, $X$, for a simulation study and have an "expert" estimate of the minimum, $\hat a$, the most likely (mode), $\hat m$, and the maximum, $\hat b$.
I'd prefer to avoid the ...
