Introduction to DiscreteEvent Simulation

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COMP8700 Agent-Directed Simulation
Introduction to Discrete-Event Simulation
Dr. Levent Yilmaz MSNet Auburn MS
Laboratory Computer Science Software
Engineering Auburn University, Auburn, AL
36849 http//www.eng.auburn.edu/yilmaz
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Agent-Directed Simulation
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Aim

• The aim of this lecture is to overview the
  fundamentals, underlying principles, conceptual
  frameworks, and the life-cycle of a
  discrete-event simulation study.

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• The initialization include the assignment of
  initial values to all the attributes.
• Fixed time increment is as the time flow
  mechanism.
• If an activitys condition is satisfied, the
  actions of that activity are executed.

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• The three phase approach combines activity
  scanning and event scheduling frameworks.
• Unlike the two-phased approach the time flow
  mechanism implements a variable time increment
  approach.
• All B (bound to occur unconditional) activities
  with occurrence times equal to the simulation
  clock are executed before activity scanning takes
  place.

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• Under this framework the life cycle of an object
  that moves through and interacts with the
  processes of the system is represented.
• Initialization phase creates the attributes and
  dynamic objects.
• In the clock update phase the time is advanced to
  the move time of the front-end object of the FOL.
• All objects with equivalent move time are
  transferred to COL, which is processed in the
  scan phase.

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• Problem formulation is the process by which the
  initially communicated problem is translated into
  a formulated problem sufficiently well defined to
  enable specific research action.
• Not enough attention is given in the life cycle.
• The accuracy of problem formulation greatly
  affects the acceptability and credibility of
  simulation results.

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