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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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 ...
Galen's user avatar
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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?
Mohammad Reza Salehizadeh's user avatar
1 vote
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Open-Source DES for perishable goods

Can anybody point to examples of using open-source discrete event simulation packages (simpy, salabim, ...
Ralph Asher's user avatar
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, ...
Miss Mae's user avatar
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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 ...
gmn's user avatar
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3 votes
1 answer
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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 ...
A.Omidi's user avatar
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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 ...
P. Hopkinson's user avatar
2 votes
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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. ...
Ralph Asher's user avatar
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 ...
Hussam Aoun's user avatar
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 ...
Raghav Thakar's user avatar
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 ...
Brendan Hill's user avatar
2 votes
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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, ...
Roger's user avatar
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1 answer
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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-...
almostKapil's user avatar
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 ...
Jayyu's user avatar
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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 ...
Dylan Solms's user avatar
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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,...
ramin's user avatar
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3 votes
1 answer
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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. I ...
Christoph's user avatar
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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: ...
Mark K's user avatar
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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 ...
Approximations's user avatar
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 ...
Brendan Hill's user avatar
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 ...
Ted's user avatar
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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 ...
Nishant Kumar Gupta's user avatar
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 ...
GrayLiterature's user avatar
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 ...
Edv Beq's user avatar
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6 votes
0 answers
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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 ...
Yolo_chicken's user avatar
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 ...
janicebaratheon's user avatar
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.
Junior MIP's user avatar
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 ...
Brendan Hill's user avatar
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, ...
Kevin S. Van Horn's user avatar
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 ...
Djames's user avatar
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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 ...
pulselaserman_quantum's user avatar
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 ...
Libra's user avatar
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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?
Yinan's user avatar
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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 ...
SecretAgentMan's user avatar