I think many of the neters can answer half of the last question.  Or with a visual impression.  Even the Chinese engineers.  
--------------------------
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----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Thu Nov 12 09:41:18 2009
Subject: Re: [TN] Engelmaier expression etc.

That sounds like the kind of meeting you sit in where you say nothing 
and try and nod your head at the right times to disguise the fact that 
you're suffering from clue deficit syndrome.

I have no idea to the answer to any of your questions.

Best regards to Norris and Landzberg.



Hernefjord Ingemar wrote:
>  
> Participated in a meeting about LGA/QFN/BGA reliability and life. Have a couple of qs.
>
> 1.NN (Neural Networks) often contain up to 20 parameters. Will these models really be useful in practice? Seems a lot to complicated to me.
>
> 2.What is Norris-Landzberg equation? Has it to do with extrapolation of accelerated test results?
>
> 3.About damage during ramp vs. damage during dwell (temp cycling), how do you decide data which mirrors real operational conditions?
>
> 4.Is Matlab 7.6.0 useful for practical reliability calculation, or is it just research tool?
>
> 5. What is the Engelmaier expression? Has it to do with Werner's face after a couple of beer?
>
> /Inge
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-- 
Eric Christison Msc
Mechanical Engineer
Consumer & Micro group
Imaging Division

STMicroelectronics (R&D) Ltd
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