Simulation – Simulation Study of a Hospital Automated Materials Handling System 2
•Two modeling concepts
•Breaking down the system activities into identifiable event elements
•Use a dynamically changing list of future events
•WIDES – Wisconsin Discrete Event Simulator
•The system had four main components – the database, the scheduler, the simulation program and the output
•Conclusion – a feasible schedule of deliveries has NOT been achieved
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Concept 1: Events can be defined as triggering or triggered.
Concept 2: Use this list in order to monitor the flow of carts in the simulation. This requires a priori knowledge of the precedence relationships for each event within the system.

WIDES is a Fortran and GASP based event simulation language with event-oriented perspective. It is composed of more than fifty subroutines, used as model building blocks in the process of modeling the ACT system

Database - contained the input of the system – user demands for materials (scheduled or unscheduled)
Scheduler – a program written to assist in scheduling deliveries
Simulation program – 2 modules:  the initiation module (initialize system variables and parameters) and the execution module.
Output – messages are constantly output on the CRT. Three types of hard copy output: WIDES trace, ACT movement table and ACT transportation table

With what has been demonstrated through simulation, an erroneous operational plan has been averted from being implemented in the new facility. The simulation has proven to be an invaluable educational tool for all those involved with the ACT system.

(Ross et. al., 1978)