DTIC ADA040807: Models of the US Army Worldwide Logistic System (MAWLOGS). Volume IVA. Addendum to Programmer-s Guide.Report as inadecuate




DTIC ADA040807: Models of the US Army Worldwide Logistic System (MAWLOGS). Volume IVA. Addendum to Programmer-s Guide. - Download this document for free, or read online. Document in PDF available to download.

Download or read this book online for free in PDF: DTIC ADA040807: Models of the US Army Worldwide Logistic System (MAWLOGS). Volume IVA. Addendum to Programmer-s Guide.
This volume is an addendum to AD-923 126L, AD-923 127L, and AD-923 132L.


Author: Defense Technical Information Center

Source: https://archive.org/


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THE BDM CORPORATION CHAPTER I I WRITING CONTINUOUS FLOW MODULES A.
BASIC DIFFERENCES The basic difference in discrete event and continuous flow models requires significant differences in the programming of modules for the different families.
A discrete event model represents only significant events in the system occurring at random times.
In a continuous flow model, a rigid time stepping procedure is set up to update all variables in the system at the same time. Although continuous flow verbs are designed to be utilized in a model description in the same manner as those in the discrete event families, the programming structure of continuous flow verbs is quite different.
A typical discrete event verb represents the processing of a demand or shipment which is characterized by a set of attributes in the arrays ATRIB or HOLD.
A verb expects certain attributes to be used for specified purposes and will alter those attributes and pass their contents back to the calling program or store them in a file for later processing.
The set of attributes is sent through the node network system by references to different nodes and exists as an entity throughout its lifetime, either in a verb during processing, in the time file waiting for the next event to occur, or in a queue at a node. In contrast, continuous flow models represent the rates of flow between nodes and the levels of materiel at nodes in the system.
The continuous flow verbs contain equations to calculate these rates and levels at every time step, based on values from the previous time step.
There is no identifiable set of attributes representing an individual demand or shipment traveling through the system.
The level of detail in a continuous flow module is determined by what types of rates and levels are represented and what interactions between them simulated.
Since a module does the same thing every time step, the size of the time step in a model determines how THE BDM CORPORATION It closely the model repre...





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