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Re: [ontolog-forum] Conjunction and Disjunction

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Ed Barkmeyer <edbark@xxxxxxxx>
Date: Fri, 10 Jul 2009 13:06:24 -0400
Message-id: <4A577510.5000605@xxxxxxxx>
Rich Cooper wrote:    (01)

> Given two statements detected by the sensors, there is absolutely no  
> reason to choose AND over OR as the interpretation.    (02)

I sure hope Rich isn't in the business of building automata.  Consider a 
security system with two sensors, one of which notices whether there is 
a person in a restricted area, and the other notices whether there is an 
authorized personnel badge in the same restricted area.    (03)

I want the security rule to read:
   IF person detected AND NOT badge detected, THEN Sound Alarm.    (04)

By comparison:
   IF person detected OR NOT badge detected, THEN Sound Alarm
will probably produce continuous cacophony. ;-)    (05)

So, yes, there is absolutely a very strong reason to choose AND over OR 
in interpreting the sensor input.    (06)

-Ed    (07)

P.S. With apologies to Rich, this strikes me as an excellent candidate 
for Hatlo's Inferno. (for those of you old enough to remember) ;-)    (08)

Edward J. Barkmeyer                        Email: edbark@xxxxxxxx
National Institute of Standards & Technology
Manufacturing Systems Integration Division
100 Bureau Drive, Stop 8263                Tel: +1 301-975-3528
Gaithersburg, MD 20899-8263                FAX: +1 301-975-4694    (09)

"The opinions expressed above do not reflect consensus of NIST,
  and have not been reviewed by any Government authority."    (010)

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