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pl:prolog:pllib:electrical_network_kb [2019/06/27 15:50] |
pl:prolog:pllib:electrical_network_kb [2019/06/27 15:50] (aktualna) |
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| + | ====== Electrical network kb ====== | ||
| + | {{tag>knowledge_base electronics}} | ||
| + | ===== Description ===== | ||
| + | A knowledge base for identifying faults in an electric network | ||
| + | |||
| + | **Source**: PROLOG programming for artificial intelligence, 3rd Edition, Harlow, 2001, ISBN 0-201-40375-7. | ||
| + | ===== Download ===== | ||
| + | Program source code: {{electrical_network_kb.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | % Figure 16.3 A knowledge base for identifying faults in an electric | ||
| + | % network such as the one in Figure 16.2. | ||
| + | |||
| + | :- op( 200, xfy, [:, ::]). | ||
| + | :- op( 185, fx, if). | ||
| + | :- op( 190, xfx, then). | ||
| + | :- op( 180, xfy, or). | ||
| + | :- op( 160, xfy, and). | ||
| + | :- op( 140, fx, not). | ||
| + | |||
| + | % A small knowledge base for locating faults in an electric network | ||
| + | |||
| + | % If a device is on and not working and its fuse is intact | ||
| + | % then the device is broken. | ||
| + | |||
| + | broken_rule :: | ||
| + | if | ||
| + | on(Device) and | ||
| + | device( Device) and | ||
| + | (not working(Device)) and | ||
| + | connected( Device, Fuse) and | ||
| + | proved( intact( Fuse)) | ||
| + | then | ||
| + | proved( broken( Device)). | ||
| + | |||
| + | % If a unit is working | ||
| + | % then its fuse is OK. | ||
| + | |||
| + | fuse_ok_rule :: | ||
| + | if | ||
| + | connected( Device, Fuse) and | ||
| + | working( Device) | ||
| + | then | ||
| + | proved( intact( Fuse)). | ||
| + | |||
| + | |||
| + | % If two different devices are connected to a fuse and | ||
| + | % are both on and not working then the fuse has failed. | ||
| + | % NOTE: This assumes that at most one device is broken! | ||
| + | |||
| + | fused_rule :: | ||
| + | if | ||
| + | connected( Device1, Fuse) and | ||
| + | on( Device1) and | ||
| + | (not working( Device1)) and | ||
| + | samefuse( Device2, Device1) and | ||
| + | on( Device2) and | ||
| + | (not working( Device2)) | ||
| + | then | ||
| + | proved( failed( Fuse)). | ||
| + | |||
| + | |||
| + | same_fuse_rule :: | ||
| + | if | ||
| + | connected( Device1, Fuse) and | ||
| + | connected( Device2, Fuse) and | ||
| + | different( Device1, Device2) | ||
| + | then | ||
| + | samefuse( Device1, Device2). | ||
| + | |||
| + | device_on_rule :: | ||
| + | if | ||
| + | working( Device) | ||
| + | then | ||
| + | on( Device). | ||
| + | |||
| + | |||
| + | fact :: different( X, Y) :- not (X = Y). | ||
| + | |||
| + | fact :: device( heater). | ||
| + | fact :: device( light1). | ||
| + | fact :: device( light2). | ||
| + | fact :: device( light3). | ||
| + | fact :: device( light4). | ||
| + | |||
| + | fact :: connected( light1, fuse1). | ||
| + | fact :: connected( light2, fuse1). | ||
| + | fact :: connected( heater, fuse1). | ||
| + | fact :: connected( light3, fuse2). | ||
| + | fact :: connected( light4, fuse2). | ||
| + | |||
| + | |||
| + | askable( on(D), on('Device')). | ||
| + | |||
| + | askable( working(D), working('Device')). | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
