Conceptual modeling

Modeling Variability ,[object Object],[object Object],[object Object],[object Object]

Generating Random Numbers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Linear Congruential Method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Using Random Numbers to generate events ,[object Object],[object Object],95 – 00 1 .05 6 90 – 94 .95 .05 5 75 – 89 .90 .15 4 35 – 74 .75 .40 3 10 – 34 .35 .25 2 00 – 09 .1 .10 1 Random Digit Assignment Cumulative Frequency Observed Frequency Service Time (minutes)

Random Variates ,[object Object],[object Object]

Example of a random variate generator

Conceptual Modeling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conceptual Modeling ,[object Object],[object Object],[object Object]

What is conceptual modeling? ,[object Object],[object Object]

Elements of Conceptual Modeling ,[object Object],[object Object],[object Object],[object Object]

Elements of Conceptual Modeling ,[object Object],[object Object]

Representing the Conceptual Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Representing the Conceptual Model ,[object Object],Customers (inter arrival time) Queue Capacity Service (Service time distribution)

Representing the Conceptual Model ,[object Object],Customer Arrives Space in Queue? Queue for Service Customer Served Customer Leaves Server Available? No No Yes Yes

Framework for Conceptual Modeling Source: Simulation by Robinson, 2004 Inputs Experimental Factors Simulation Model Outputs Responses Model Objectives Problem Situation

Methods of Model Simplification ,[object Object],[object Object],[object Object],[object Object]

Simplification Approaches ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Guidelines for simplification ,[object Object],[object Object],[object Object]

Data Collection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Types of Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Dealing with Unobtainable Data ,[object Object],[object Object]

Other Data Issues ,[object Object],[object Object],Time TBF1 Machine down time TBF2

Data Representing Unpredictable Variability (Random) ,[object Object],[object Object],[object Object],[object Object]

Verification and Validation ,[object Object],[object Object]

Conceptual modeling

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Conceptual modeling