Noticeable expand ...... but Einstein is also a fallen Angel.... He spent last 30 yeas of his life trying to unify the theory of Weak forces, Strong forces, gravitational and electromagnetic force. He essentially violated his own saying of : "Everything should be made as simple as possible , but no simpler." He tried to make it simpler by an illusion of unification. He also said: "God doesn't play Dice with nature" Quantum mechanic theory proved that, indeed the Dice has been played. Hisenberg uncertainty principal proved that even observations of real experiment is not the reality. We do see this when we do time domain and frequency domain analysis. As we try to detect exact frequency the notion of time becomes inaccurate and as we try to detect at what time precisely the frequency component came to existence then the exact value of frequency becomes fuzzy ( and no the short time Fourier transform or wavelet method do not resolve this) There are lots of "Monday Morning" quarterbacking involved in "Modeling" and "Simulations" which leads erroneously calling them all wrong. Nothing is crisp here. "What is above is below and what is below is above" Let the game begin ........... Regards; Don Pakbaz Silicon Solutions Engineering IBM Systems & Technology Group "Mark Randol" <Mark.Randol@onse mi.com> To Sent by: <si-list@xxxxxxxxxxxxx> si-list-bounce@fr cc eelists.org Subject [SI-LIST] Re: Theory v. practice, 04/03/2006 11:55 following Re: DesignCon quote AM Please respond to Mark.Randol I'd expand on that model a little... A good engineer starts with the simplest model to prove the idea, then adds factors that in their judgment says will be a problem. Normally only a couple things at MOST at a time, to reduce the degrees of freedom when it breaks and needs correcting. The best use the 'extra' effects as a feature in the design when the effect is understood well enough to be predictable and manufacturable enough to be repeatable. =20 I don't remember if it's been requoted here or not, but one attributed to Einstein was "The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience." =20 I prefer the pithier if inaccurate translation , "Everything should be made as simple as possible, but no simpler." It's a simpler model... -- Mark Randol, RF Evaluation & Application Engineer ON Semiconductor 901 S. Mopac Expressway Barton Oaks IV, Suite 343 Austin, TX 78746 512-329-5640 (voice), 512-329-8151 (FAX) =20 > -----Original Message----- > From: Ing. Giancarlo Guida [mailto:gianguida@xxxxxxxx]=20 > Sent: Sunday, April 02, 2006 12:59 PM > To: Mark Randol > Cc: si-list@xxxxxxxxxxxxx > Subject: Re: [SI-LIST] Re: Theory v. practice, following Re:=20 > DesignCon quote >=20 > Hi folks, > I'd like to add my two cents to this interesting discussion. > From my point of view the most important quality of a model=20 > ( and therefore simulation) it is not its accuracy... > but its simplicity. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu