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Extensive Large Scale Real Time Knowledge Based Systems Design: the Sachem Example - page 15 / 17

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© Marc LE GOC - LSIS - DLS03 Dec 3-4 - Tucson

15

One of the advantages of discrete event representation is compactness

50 000 octets of the Sachem Process Data Base are required to produce one octet in the Sachem Event’s Data Base

One year of blast furnace behavior is ~30,000 events

Event’s Data Base = 4.7Mb Sachem Digital Data base = 235,000 Mb

15 years of blast furnace (450,000 events) is only ~70Mb !

To be compared with 15*235,000Mb = 3,525Gb !

Sachem Process Data Base(~5500 variables)

500 < Factor < 1000

Events Log

50 < Factor < 100

Compactness Factor = ~50 000

Process Data (~1100 variables)

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