e4332187   
   From: walter@bytecraft.com   
      
   Bill Silvert wrote:   
      
   > On Apr 6, 11:16 pm, "bint"  wrote:   
   > >    Do you know of any examples where fuzzy logic has been used to control   
   > > the shape of an object, or the path of something, in a way that would have   
   > > been difficult otherwise?   
   >   
   > I think that this is getting out of hand. Here is a simple example   
   > which you can read in greater detail in any book on bicycle mechanics.   
   > You want a bicycle wheel to be as close to a perfect circle as   
   > possible, and the instructions on how to do this are fuzzy. Basically   
   > they consist of commands such as "if the wheel wobbles to the left you   
   > loosen the left spoke and tighten the right spoke." The further it is   
   > out of true, the more you loosen and tighten the spokes. Although the   
   > instructions to human mechanics are fuzzy,  were to construct a machine to true the wheels automatically (probably   
   > such machines exist), a fuzzy controller would be appropriate for   
   > implementation.   
   >   
   > Bill Silvert, a.k.a. Bicycle Bill   
      
   Bill,   
      
   Linguistic variables are the stuff we as humans understand best. Many   
   of the fuzzy logic problems are the manipulation of linguistic variables.   
      
   You could code your bicycle wheel adjustment as a series of fuzzy rules.   
      
   A few years ago late at night I was preparing for a talk on fuzzy logic   
   and I made myself a bowl of soup. The instructions were almost all   
   linguistic references. For example, "Bring to a boil over medium-high   
   heat, whisking constantly".   
      
   There is a museum in Oxford England of old scientific instruments. The   
   old thermometers have scales calibrated in linguistic references like   
   "freezing", "cold" , "hot" and "very hot" which leads one to wonder if   
   the natural form of measurement may be linguistic and not crisp.   
      
      
   Regards,   
      
   --   
   Walter Banks   
   Byte Craft Limited   
   1 (519) 888-6911   
   http://www.bytecraft.com   
   walter@bytecraft.com   
      
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