Questions tagged [simulation]

For questions related to the use of computer models to estimate performance measures for complex systems, typically under uncertainty.

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Optimizing a distribution to a much more flatter distribution

I have a distribution of values that are the output of a simulation(not stochastic). I want to optimize the parameter such that output distribution are a lot more flatter than they are with non-...
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1 vote
1 answer
76 views

Where to download SISCO-simulator for integrated supply chain operations

I am trying to find the software called SISCO (Simulator For Integrated Supply Chain Operations). It is developed by Chatfield et al. (2006)1. However, it seemed that the authors did not include the ...
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9 votes
2 answers
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Significant bias introduced into simple simulation

This question has been asked on Cross Validated Introduction Service is allocated to an infinite source of customers i.e. there is always a service in progress. The duration of the $i^{th}$ service ...
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0 votes
1 answer
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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,...
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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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  • 121
4 votes
1 answer
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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: ...
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  • 429
1 vote
1 answer
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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 ...
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3 votes
0 answers
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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 ...
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8 votes
2 answers
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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 ...
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  • 81
5 votes
2 answers
1k 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 ...
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1 vote
1 answer
179 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 ...
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3 votes
1 answer
291 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 ...
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6 votes
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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 ...
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6 votes
1 answer
100 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 ...
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10 votes
1 answer
1k views

Simulation in Python

What is the most common package for discrete-event simulation in the OR community? I have found SimPy package.
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13 votes
2 answers
510 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 ...
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15 votes
5 answers
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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, ...
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22 votes
5 answers
3k 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 ...
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5 votes
2 answers
534 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 ...
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22 votes
4 answers
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 ...
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  • 907
14 votes
4 answers
450 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?
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  • 369
11 votes
1 answer
266 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 ...
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