Questions tagged [simulation]
For questions related to the use of computer models to estimate performance measures for complex systems, typically under uncertainty.
34
questions
24
votes
5
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 ...
- 937
22
votes
5
answers
5k
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 ...
- 1,143
15
votes
5
answers
5k
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, ...
14
votes
4
answers
970
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?
- 379
13
votes
2
answers
553
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 ...
- 636
11
votes
1
answer
400
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 ...
- 1,895
11
votes
1
answer
2k
views
Simulation in Python
What is the most common package for discrete-event simulation in the OR community?
I have found SimPy package.
- 400
10
votes
2
answers
562
views
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 ...
- 463
8
votes
2
answers
94
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 ...
- 81
6
votes
1
answer
109
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 ...
- 459
6
votes
0
answers
61
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 ...
- 161
5
votes
2
answers
2k
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 ...
4
votes
2
answers
585
views
Using the "true" sample rather than sampling from a distribution - is there a name for this?
I have drawn X-many samples from a population. I want to use this data to drive inputs for a Monte Carlo simulation (or similar). The population may be a real world measurement, or it could be the ...
- 203
4
votes
1
answer
103
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:
...
- 429
4
votes
2
answers
819
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 ...
4
votes
0
answers
30
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 ...
- 636
3
votes
1
answer
105
views
Can simulation be known as a practical AI?
AI algorithms, specifically in industries, can be used to work and manipulate the data to estimate or learn this data to achive a solution or prepare trained data to feed that into an optimization ...
- 8,882
3
votes
1
answer
271
views
Optimization for Stochastic Simulations
This questions stems from my original question here. I have a system, where each 'run' is a simulation of agents switching between tasks (or states) as in a Markov Chain. I would like to find ways to ...
- 325
3
votes
1
answer
874
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 ...
- 141
3
votes
1
answer
73
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.
I ...
- 131
2
votes
1
answer
79
views
Need a multi-optimization environment or plugin in Anylogic
currently I am working on a model to simulate the supply chain of a group of warehouses in a country using Anylogic. Then I need to multi-optimize these outputs to get the best one based on optimizing ...
- 51
2
votes
1
answer
74
views
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-...
- 69
2
votes
1
answer
100
views
How does one model weather in Simio and have it change how vehicles operate within the model?
For context, I am using the Simio modeling software for an OR class, and for fun I am making a simulation model of the traffic outside my dorm. I have recreated the layout and distance of the streets, ...
- 143
2
votes
0
answers
27
views
What are process-based DES and event-based DES, exactly?
I have occasionally heard the terms "process-based DES" and "event-based DES".
For example, from SimPy:
SimPy is a process-based discrete-event simulation framework based on ...
- 131
2
votes
0
answers
54
views
Optimization-simulation: is this sensible?
This is my problem:
I am planning camping trips for multiple people. Each person will be given a route. The routes may intersect at some points. They all start their trip simultaneously. Whenever two ...
- 666
2
votes
0
answers
46
views
Monte Carlo simulation of (potentially) correlated multiple time series
I am seeking help on how to perform Monte Carlo simulations on (potentially) correlated time series. I have a single product (e.g., men's wallets) that are sold out of seven stores in the same city. ...
- 763
2
votes
0
answers
97
views
Supply chain simulation is not working. Any help please?
I am trying to simulate a supply chain scenario. Demand is random (e.g. between 100-400 units) and lead time vary 2 to 4 days for each supply. The holding cost(h), penalty cost (p) for lost_sales, ...
- 21
1
vote
1
answer
127
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 ...
- 167
1
vote
1
answer
60
views
What methods exist for tree search over a large complex state representation?
Tree search over a state space often assumes that the state can be represented compactly and repeated in each node of the search tree.
Suppose I have a large simulation with 100000's of entities each ...
- 636
1
vote
1
answer
90
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 ...
- 173
1
vote
1
answer
274
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 ...
- 2,309
1
vote
0
answers
12
views
Open-Source DES for perishable goods
Can anybody point to examples of using open-source discrete event simulation packages (simpy, salabim, ...
- 763
0
votes
1
answer
95
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,...
- 55
0
votes
0
answers
46
views
monte carlo for a selection problem
What type of Monte Carlo simulation is suitable for solving this problem? Also, how can we select results after simulation to guarantee feasibility?
