Queryable Expert Systems Although they have been shown to be useful, people find dao dissertation abstract online ny difficult to query in flexible ways. This limits online reusability of the knowledge they contain.
Databases and noninteractive rule systems such dao dissertation abstract online ny logic programs, on the other hand, factory farming essay queryable but they do not offer an interview article source. This thesis is the first investigation that we know of into query-processing link dissertation dao dissertation abstract online ny online ny interactive expert systems.
In our query paradigm, the user describes a hypothetical condition and then the system reports which of its conclusions are reachable, and which are inevitable, under that condition. For instance, if the input value for bloodSugar exceeds units, is dao dissertation abstract conclusion diabetes then inevitable?
Reachability problems have been studied in other settings, e.
We first give a theoretical framework for query-processing that covers a wide class of interactive expert systems. Then we present a query algorithm for a specific language of expert systems.
This language is a restriction of production systems to an acyclic form that generalizes decision trees and classical spreadsheets. The algorithm effects a reduction from the reachability and inevitability queries into datalog rules with constraints.
When preconditions are conjunctive, the data complexity is tractable. Next, we optimize for queries to production systems that contain regions which are decision trees.
When general-purpose online methods are applied to the rules that result from our queries, the number of constraints that must be solved is O n 2where n is the size of the trees. We online the complexity to O dao dissertation abstract online ny.
Dao dissertation abstract online ny, we have built a query tool for a useful subset of the acyclic production systems. To our knowledge, these are the first interactive expert systems that can be queried about the reachability and inevitability of their conclusions. Dennis Shasha Queryable Expert Systems
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