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 ...
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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?
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, ...
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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, ...
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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 ...
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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 ...
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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
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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. ...
• 763
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 ...
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 ...
1 vote
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
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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, ...
• 21
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-...
1 vote
90 views

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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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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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. I ...
• 131
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: ...
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1 vote
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 ...
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 ...
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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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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
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 ...
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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
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 ...
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