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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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Here the problem characteristic is to determine current through a<br />

component or the voltage drop across a component <strong>and</strong> the specifications for<br />

the problem include voltage drop across or current through a different<br />

component. Once the (input) specifications <strong>and</strong> the (output) requirements of<br />

the problems are known, we have to search concepts that can represent the<br />

problems. In case of electrical circuits, Kirchoff’s laws, Ohm’s laws,<br />

Thevenin’s theorem, reciprocity theorem, superposition theorem, etc.<br />

correspond to concepts that may be used to represent the problem. The next<br />

task is to design structures to organize knowledge. In electrical circuit<br />

problems, ‘finding structures’ means determining the appropriate rules<br />

(laws/theorems) to represent the problem. For instance, in a simple loop, when<br />

the current through a passive component is known, <strong>and</strong> the value of the<br />

component is also known, we can employ Ohm’s law to find the drop across<br />

it. When the currents through some of the components <strong>and</strong> /or voltage drops<br />

across one or more components are known <strong>and</strong> there exist a number of loops,<br />

we could employ Kirchoff’s law or Maxwell’s loop equation. Thus the<br />

structures in the present context could be of the following type.<br />

IF & & <br />

THEN use .<br />

Here, the input specification <strong>and</strong> the output requirement correspond to<br />

voltage <strong>and</strong> currents supplied <strong>and</strong> to be evaluated respectively. The<br />

‘configuration’ in the present context may refer to number of loops (one or<br />

more). A look at fig. 21.2 will be useful to underst<strong>and</strong> the structure used to<br />

formulate concepts.<br />

1. IF & & <br />

THEN apply .<br />

2. IF & <br />

&<br />

<br />

THEN apply .<br />

3. IF & & <br />

THEN apply .<br />

.<br />

.<br />

.<br />

Fig. 21.2: Instances of the structure representing a concept.<br />

It may be added here that the structure describing the concepts need not<br />

be always IF-THEN statements. Structure <strong>and</strong> pointers, filler <strong>and</strong> slots or any<br />

other AI techniques commonly used to represent knowledge could equally<br />

represent it. After the construction of the structure is over, its component,

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