Fuzzy Logic

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janogues

Joined: 02 Dec 2001
Posts: 19

11 Dec 2001 21:07

Is somebody working with Fuzzy Logic?

Thanks Wink

Phytex

Joined: 16 Dec 2001
Posts: 176

13 Feb 2002 12:40

Yes, I'm working with Fuzzy Logic? What you want?

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Stu

Joined: 25 Apr 2001
Posts: 13
Location: Wales UK

16 Feb 2002 1:22

Hi,
I have been doing bits and pieces with fuzzy logic for the past few years, mainly for students, with C code and simulation.
I am willing to help..as i am bored as hell at the moment
Regards
Stu

Phytex

Joined: 16 Dec 2001
Posts: 176

08 Mar 2002 12:09

Can you send me some source code, then I have a look on it!

Manji

Joined: 01 Jan 1970
Posts: 17

09 Mar 2002 11:08

FYZZY LOGIC is very interesting area of control and electronics engineering.
there is a powerful tool named FUZZYTECH
that generates c code from block diagram.
I think it was in FILMAN.

mypooka

Joined: 30 Dec 2001
Posts: 41

09 Mar 2002 23:15

The site confused me.
what is a good learning
program, for code output!

105389

Joined: 08 Nov 2001
Posts: 26

10 Mar 2002 22:48

try

http://www.fuzzytech.com/

http://www.inform-ac.com/

for info

tcsa35

Joined: 19 Mar 2002
Posts: 224
Helped: 2

14 Jun 2004 14:08 Fuzzy Logic

Please can you share some books about fuzzy logic.

ChAoS666

Joined: 28 Apr 2004
Posts: 23
Location: Thailand

20 Jun 2004 4:55 Re: Fuzzy Logic

tcsa35 wrote:

Please can you share some books about fuzzy logic.

you can get it at h**p://www.ece.osu.edu/~passino/books.html Cool

I hope its good resource for you.

Daneshgar

Joined: 11 Nov 2003
Posts: 23
Location: Iran

28 Jun 2004 14:09 Re: Fuzzy Logic

I am working whit Fuzzy Logic and VHDL coke for Fuzzy Processor.

This PDF is good for start in Fozzy Logic.

Sorry, but you need login in to view this attachment

dumbfrog2

Joined: 07 Sep 2004
Posts: 9

27 Sep 2004 17:04 Re: Fuzzy Logic

There is a book called "Design of Analog Fuzzy Logic Controllers in CMOS Techonologies" in the EDA book fourm. Currently, I am reading it and it is very interesting.

zmath

Joined: 14 Jun 2003
Posts: 62

27 Sep 2004 17:34 Fuzzy Logic

http://www.seattlerobotics.org/encoder/mar98/fuz/flindex.html

wang.mickey

Joined: 29 Aug 2004
Posts: 9

01 Oct 2004 17:44 Re: Fuzzy Logic

try

h**p://www.fuzzytech.com/

h**p://www.inform-ac.com/

for info

peakwmh

Joined: 08 Oct 2004
Posts: 7

08 Oct 2004 14:12 Fuzzy Logic

vhdl would take advantages, but it may uses mouts of LE

engineer

Joined: 09 Apr 2005
Posts: 62
Helped: 1

16 Apr 2005 22:24 Re: Fuzzy Logic

sorry,
but what's this fuzzy logic?
why it's called fuzzy
I only know Logic
please don't be angry with me as I'm still studying electrical engineering
thanks in advance

XNOX_Rambo

Joined: 13 Jul 2002
Posts: 437
Helped: 87
Location: Far out, man!

16 Apr 2005 23:23 Re: Fuzzy Logic

Check here:
http://www.webopedia.com/TERM/f/fuzzy_logic.html

ME

Joined: 14 Mar 2002
Posts: 1523
Helped: 13

17 Apr 2005 8:35 Re: Fuzzy Logic

engineer wrote:

sorry,
but what's this fuzzy logic?
why it's called fuzzy
I only know Logic
please don't be angry with me as I'm still studying electrical engineering
thanks in advance

Always try to look a word up at www.answers.com before asking the meaning:
http://www.answers.com/fuzzy-logic

as_518

Joined: 10 Apr 2005
Posts: 80
Helped: 5

20 Apr 2005 17:46 Re: Fuzzy Logic

in the normal logic any statement could either be true or false. in fuzzy logic any statement is true to degree and false to degree. to be more simple normal logic is black and white while fuzzy logic is a full colored. for example if we talk about tall people in normal logic we must but a clear crisp statment like " any one taller than 180 cm is tall" but what about some one 179 cm in fuzzy logic he is still tall but with a degree of say 179/180. to read more about the principles of fuzzy logic see the fuzzy system handbook by earl cox

hgb

Joined: 09 Jun 2004
Posts: 22
Location: México.

20 Apr 2005 18:18 Re: Fuzzy Logic

I question if is posible to aply normal logic add infinitum to aproximate the result? or any like is called?

You say:

if(height >= 1.80) then is tall
else not

when in fuzzy can be some like?

Code:

#define MINIMUN_STEP_FOR_FLOAT_VALUE 0.00000001f
degree=0
limit = 1.80

while(height != limit){
if( height >= limit){
degree++;
height -= MINIMUN_STEP_FOR_FLOAT_VALUE;
}else{
degree--;
height += MINIMUN_STEP_FOR_FLOAT_VALUE;
}
}

Tought the two boolean value can be used for aproximate the "degree" is that fuzzy?

Also a two bolean state can aproximate only if the number is representable, like the number PI can be aproximated in the two sides of the line with fractional numbers, but none of then will reach it ¿?

Jack// ani

Joined: 02 Dec 2004
Posts: 488
Helped: 25

20 Apr 2005 19:13 Re: Fuzzy Logic

Daneshgar wrote:

I am working whit Fuzzy Logic and VHDL coke for Fuzzy Processor.

This PDF is good for start in Fozzy Logic.

Hi Daneshgar,

Will you please put some more info about your attachment. Who is the author, is it a book or tutorial?

as_518

Joined: 10 Apr 2005
Posts: 80
Helped: 5

21 Apr 2005 0:23 Re: Fuzzy Logic

fuzzy logic uses membership function for tall people it may be that we consider all above 180cm is certainly tall i.e mf=1 and that all whome less than 150 is certaily not tall i.e mf=0. and drawe aline between the two points we get the mf.
mf
1 1 0------------
1 0
.5 1 0
1 0
0 1----------------o---------------0------ tall
150 180
for example if someone tall is 165 its membership function in tall people is .5

fuzzy

Joined: 25 Sep 2004
Posts: 109
Helped: 10

22 Apr 2005 8:31 Re: Fuzzy Logic

This good ic for fuzzy microcontroller and all software free

http://www.st.com/stonline/products/support/micro/st5/prod.htm

as_518

Joined: 10 Apr 2005
Posts: 80
Helped: 5

27 Apr 2005 0:07 Re: Fuzzy Logic

it is worth to mention that fuzzy logic was ininted by lotfi zhadeh

He was born in 1921 in Baku, Soviet Azerbaijan; but in truth, as creator of the concept of "Fuzzy Logic", Lotfi Zadeh belongs to a world where there are no boundaries limited to time or place. He really is best characterized as an internationalist. He's quick to shrug off nationalism, insisting there are much deeper issues in life. "The question really isn't whether I'm American, Russian, Iranian, Azerbaijani, or anything else," he'll tell you. "I've been shaped by all these people and cultures and I feel quite comfortable among all of them."

It's a vivid example of how in real life Zadeh shuns abrupt absolute categories that don't take into account life's complexities. It's the same kind of thinking that characterizes Fuzzy Logic, an unorthodox theory which he invented which is impacting computer technology.

Born of an Azerbaijani father on assignment as a journalist from Iran, and a Russian mother who was a physician, Zadeh enjoyed a privileged life those early years of his life in Baku. But at the age of ten, when Stalin introduced collectivization of farms throughout the Soviet Union, widespread famine followed, and the Zadeh family moved back to his father's homeland. There he continued his education in English in a private Presbyterian school in Tehran. After high school, he sat for the national university exams and placed second in the entire country. In 1942, he was graduated from the University of Tehran in electrical engineering.

During World War II, he moved to the US and took a Master's degree from Massachusetts Institute of Technology (MIT) in 1946 and a Ph.D. from Columbia (New York) in 1949, where he began teaching systems theory. Since 1959, Zadeh has taught at Berkeley, first in the Electrical Engineering (EE) Department where he became Chair in 1963, and later in the Computer Science Division (EECS).

Retirement?
Since 1991, he's been officially "retired" though it's hard to imagine how he could keep a busier schedule. He still continues to go to his office on campus everyday when in town; but conferences and consultations, often abroad, keep him away, on average, a few days each week. He generally takes the "red-eye" flights to the East Coast, preferring to travel all night because his schedule is too tight to spend much time hanging around in airports and hotels.

Lotfi Zadeh, in person, is a lean, quiet, unpretentious, unassuming sort of man. He's often described as extremely gracious-a "gentleman" in the European sense of the word-even by those who don't agree with him. He's methodical, given to details, a "pencil person" (preferring the eraser's tentativeness over pen). During his leisure, he's extremely fond of photography though he used to have more time for it in years past than now. Black and white portraiture (with its fine nuances of grays, of course) is his favorite. He has photographed quite a few famous people himself, including Presidents Truman and Nixon.

His original paper on Fuzzy Logic published in 1965 encountered skepticism and, in his words, occasional, downright hostility. Nearly thirty years later, the controversy surrounding Fuzzy Logic is still with us, though not to the same extent. The numerous applications of Fuzzy, especially in Japan, are too visible to be denied.

He's gifted with a mind that provides the flexibility to address learned scientists as well as the most unindoctrinated novice by describing scientific principles in concrete tangible examples from everyday life. He tries to best to be accessible to both groups.

Although Fuzzy logic has a much longer reach than traditional logical systems, Zadeh is the first to admit that it is not a panacea. "There are and will be many tasks which humans can perform with ease and which lie beyond the capability of any computer, any machine and any logical system that we can conceive of today."

How Big is "Fuzzy"?
Who knows? Zadeh is too busy pushing forward to keep up with how far the field has expanded. His office in the newly constructed Computer Science Building at Berkeley is stacked floor to ceiling with reprints of articles related to Fuzzy. He believes that people are studying this field in every country which offers advanced education. Twelve journals are now published which include the word "Fuzzy" in their title. An estimated 15,000 articles have been published, although it's hard to be exact as some appear in obscure journals in remote parts of the world. An estimated 3,000 patents have been applied for and 1,000 granted. The Japanese, with 2,000 scientists involved in Fuzzy Logic, have been very quick to incorporate Fuzzy Logic in the design of consumer products, such as household appliances and electronic equipment and one company, Mitsushita (which sells under the name of Panasonic and Quasar) acknowledged that in 1991-1992 alone, they had sold more than 1 billion dollars worth of equipment that used Fuzzy Logic. The concept is so popular there that the English word has entered the Japanese language, though the Japanese pronounce it more like "fudgy" than "fuzzy".

Zadeh's intellectual contributions are myriad. He's listed in "Who's Who in the World" and since the late 1980s when the Japanese became interested, the field has expanded exponentially. So, too have the acknowledgments of these contributions with honors such as the esteemed Honda Prize in Japan in 1991, medals, honorary memberships, doctorates, fellowships, editorships, and chairmanships from all over the world. Azerbaijan Republic is among those who have honored him in 1993 when they bestowed an honorary Professorship from the Azerbaijan State Oil Academy.

Characteristically, Zadeh is "down-to-earth", always holding abstract scientific concepts up to a reality check of their practical utility of whether they "do us any good." Since the applications of Fuzzy Logic to real life situations are infinite; it's extremely likely that we'll be hearing about Zadeh for a long, long time to come.

yakroo

Joined: 07 Nov 2005
Posts: 44

30 May 2006 8:24 Fuzzy Logic

What web have sample Code C?

hifimusic

Joined: 04 Jun 2006
Posts: 1

04 Jun 2006 17:41 Re: Fuzzy Logic

I am interested in researching fuzzy logic application for non linear industrial control systems. can someone suggest a book for this topic?

Added after 3 minutes:

If somebody could give me a link to an ebook, that will be even better.

newelltech

Joined: 23 Aug 2006
Posts: 217
Helped: 32

24 Aug 2006 16:38 Re: Fuzzy Logic

I have taken courses in fuzzy logic from Bart Kosko and other leaders at UC San Diego and have used fuzzy logic in some simple designs. But truthfully, I think it's a waste of time for most applications. The only real applications that I've seen are thermostats and cruise controls. Both of which can be implemented just as well using conventional approaches. It's a great catch phrase and looks good on your resume, but not worth the time.
Sure, some engineers may have experience and tools and be able to crank out a design that works, but it still requires a lot of 'tweaking' and experience to get it working properly.
I may sound jaded but my experience and that of fellow engineers has been less than favorable.
However, I'm open to changing my mind if there are new tools and techniques that I don't know about.

Robby

Joined: 24 Jan 2002
Posts: 46

25 Aug 2006 8:51 Re: Fuzzy Logic

Hello,

who can tell me how to get access to the fileman. I cannot se any button or link on the forum page! I have enough points I believe.

Do anybody have a fuzzy tool determined to create C code from rules and member funktions? The FUZZY*** mentioned above for example?

Thx

Robby