PRISM Forum

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Posted by: George Pyryt (gpyryt@draper.com )
Organization:Draper Laboratory
Date posted: Tue Apr 11 12:14:22 US/Eastern 2000
Subject: Storage reliability
Message:
I would like to calculate the dormant storage reliability of a system using PRISM. I set duty cycle and cycling rate to zero and also did not input any stress parameters for parts. The result gives me a failure rate which includes solder joint and electrical overstress failure rate components for each part in addition to the part nonoperational failure rate. I also applied Process Grade Factor. Is this failure rate comparable to previous approach of using 1% conversion factor for dormant storage? If not, what data should be used to get storage reliability.

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Dormant Storage Failure Rate
Norman B. Fuqua Wed Apr 12 11:02:38 US/Eastern 2000

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Posted by: Leroy Meyers (meyers@generalatronics.com )
Organization:General Atronics Corporation
Date posted: Tue Mar 14 11:22:37 US/Eastern 2000
Subject: PRISM Parameters
Message:
Two Questions:
1. As a follow up to Mr. Dooley's question regarding PRISM acceptance, have international (outside the U.S.) governments or companies began to accept PRISM? 2. I have tried the Demo version of PRISM. I am curious about the Pi and Lambda factor calculations. If I buy the PRISM package, would I receive anything that explains how these factors are calculated? I compare this to a software package that uses the 217 model, like Relex. The software will perform calculations, but I can still look in 217 to determine how a factor was derived.

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PRISM Parameters
David Dylis Fri Mar 17 11:26:50 US/Eastern 2000
international PRISM acceptance
serge CRUZEL Thu Mar 30 6:55:03 US/Eastern 2000

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Posted by: Al Dooling (alfred.l.dooling@lmco.com )
Organization:Lockheed Martin
Date posted: Fri Mar 10 15:39:12 US/Eastern 2000
Subject: PRISM Acceptance
Message:
What companies or government organizations are using PRISM? What has the response been? Do you know if any government/military organization is accepting PRISM output as an alternative to MIL-HDBK-217F.

Replies:
PRISM Acceptance
David Dylis Fri Mar 17 11:02:52 US/Eastern 2000

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Posted by: Kenneth Meyerhoffer (kmeyerho@csw.L-3com.com )
Date posted: Tue Feb 15 11:15:02 US/Eastern 2000
Subject: PRISM common elements database error
Message:
I have installed the PRISM demo but, I am also getting the 'Unable to connect to common elements database. Teminating...' message. My PC meets all of the stated minimum requirements. What next?

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PRISM common elements database error
Serge CRUZEL Wed Feb 16 9:36:31 US/Eastern 2000
PRISM DEMO
Tammy T Sehn Mon Mar 20 9:34:25 US/Eastern 2000

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Posted by: Ananda Perera (Ananda.Perera@honeywell.com )
Organization:Honeywell
Date posted: Sun Jan 30 16:45:24 US/Eastern 2000
Subject: Infant Mortality (IM) Pi Factor
Message:
Reference RAC Journal, Third Quarter-1999 Page 4 Pi_IM Equation:
(1) When SS=0.5; Pi_IM(Instantaneous at 5 Year) = 0.7662 and Pi_IM (Average over 5 Years) = 0.4728. (2) When SS=0.9; Pi_IM(Instantaneous at 5 Year) = 1.3792 and Pi_IM (Average over 5 Years) = 0.8512. Why does Pi_IM Factor increase when Screening Strength (SS)was increased. High Screening Strength is supposed to give lower failure rate. Thanks.

Replies:
Infant Mortality (IM) Pi Factor
Norman B. Fuqua Thu Feb 3 7:44:26 US/Eastern 2000

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