Simulation and modeling - Old Questions

Simulation is the imitation of the operation of a real-world process or system over time. Simulation involves the generation of an artificial history of the system, and the observation of that artificial history to draw inferences concerning the operating characteristics of the real system that is represented.

Steps in simulation study

1.Problem formulation

     Clearly state the problem.

2. Setting of objectives and overall project plan

     How we should approach the problem.

3. Model conceptualization

     Establish a reasonable model.

4. Data collection

    Collect the data necessary to run the simulation (such as arrival rate, arrival process, service discipline, service rate etc.).

5. Model translation

     Convert the model into a programming language.

6. Verification

     Verify the model by checking if the program works properly. Use common sense.

7. Validation

     Check if the system accurately represent the real system.

8. Experimental design

     How many runs? For how long? What kind of input variations?

9. Production runs and analysis

     Actual running the simulation, collect and analyze the output.

10. Repetition

     Repeat the experiments if necessary.

11. Document and report

     Document and report the results.

12. Implementation: Implement the simulated system in the real world if the simulation results show that it is advantageous to implement the new system or policy.

Limitations of simulation