| In
this issue: |
Issue 92,
October 2008
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Reliability HotWire is a
service of ReliaSoft
Corporation
To subscribe or update your e-mail preferences, go to
http://www.weibull.com/hotwire/index.htm
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Hot Topics
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Can the Likelihood Value be
Greater Than 0?
ReliaSoft's Weibull++
and ALTA software
packages provide the option to use the Maximum Likelihood
Estimation (MLE) parameter estimation method. With this method,
the set of values that maximize the likelihood function is used
as the estimated parameters for the distribution. Many
reliability engineers have the impression that the natural
logarithm of the likelihood function (Ln-likelihood) is always
negative, or in other words, that the likelihood value should
always be less than 0. However, this is not true. In this
article, we will explain the reason why the Ln-likelihood
function can be greater than 0. To read more, see
http://www.weibull.com/hotwire/issue92/hottopics92.htm
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Reliability Basics |
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Derating for Electronic Components
Derating is a technique usually employed in electrical power and
electronic devices, wherein the devices are operated at less
than their rated maximum power dissipation, taking into account
the case/body temperature, the ambient temperature and the type
of cooling mechanism used. In this article, we will briefly
explain the theoretical background of derating and how it is
applied.
To read more, see
http://www.weibull.com/hotwire/issue92/relbasics92.htm
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Tool Tips |
- Can I change my experiment
design in DOE++ after I have created it?
- How can I add items from
another
BlockSim project to the project I'm currently working
on?
To read more, see
http://www.weibull.com/hotwire/issue92/tooltips92.htm
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Latest Software Updates |
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New service releases are now
available for Weibull++
(SR 7.5.5), ALTA (SR
7.5.5),
DOE++ (SR 1.0.2),
BlockSim (SR 7.0.6)
and MPC 3 (SR 3.0.16). To
determine the compile revision of the application on your
computer, select About from the Help menu.
More Software Downloads...
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Hot News |
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Wanted: Your Ideas! - We know many of you
have great ideas that could morph into compelling
presentations for the
2009 International Applied Reliability Symposium, North
America, which will be held in San Diego, California
from June 9 - 12, 2009. Step one is to submit your
presentation proposal to the ARS committee by the
December 5, 2008 deadline. Complete details,
including the required proposal submission form, are
available at
http://www.ARSymposium.org/present.htm. Keep in
mind, too, that selected presenters will receive
complimentary registration to the event, along with
an event shirt, a small gift and a chance to win one of
the Excellent Presentation Awards. Don't miss out
on this great opportunity! |
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Public FRACAS Seminar - For the first time
ever, ReliaSoft is offering
RS 475 FRACAS Principles and Applications in a
public format, November 18 - 19, 2008 in
Tucson, Arizona. This two-day course provides an
overview of the fundamentals of Failure Reporting,
Analysis and Corrective Action Systems (FRACAS).
Emphasis is placed on configuring and using ReliaSoft's
XFRACAS
software for incident reporting, failure analysis,
problem resolution and other related analyses. For a
detailed course outline, please visit
http://www.ReliaSoft.com/seminars/gencourses/rs475.htm.
To register online, simply visit
https://Store.ReliaSoft.com/ or contact our sales
team in the USA at +1-520886-0410. |
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MIL-HDBK-217 Revision -
MIL-HDBK-217, which is used for reliability
prediction of electronic equipment, is being revised and
updated. The Defense Standardization Program Office
(DSPO), a division of the U.S. Department of Defense,
has tasked the Crane Division of the Naval Surface
Warfare Center (NSWC) with executing this revision. To
this end, NSWC Crane is soliciting test and field
part data from the reliability community. For more
information, please visit
http://www.weibull.com/mil_std/mil_hdbk_217_revision.pdf. |
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Upcoming Public
Training Event Calendar |
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October 2008 |
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October 13 - 17, 2008:
RS 540 Reliability and
Maintainability Analysis for Repairable
Systems
in
Paphos, Cyprus |
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October 20 - 21, 2008:
RS 470 Failure Modes,
Effects and Criticality Analysis
in
Singapore |
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October 22 - 24, 2008:
International Applied
Reliability Symposium
in
Singapore |
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October 27 - 31, 2008:
MSMT Foundations
in
Tucson, Arizona |
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November 2008 |
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November 10 - 14, 2008:
MSMT Foundations
in
Melbourne, Australia |
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November 10 - 11, 2008:
RS 401(C) Reliability and
Life Data Analysis (Condensed)
in
New Delhi, India |
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November 17 - 21, 2008:
MSMT Foundations
in
Bordeaux, France |
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November 18 - 19, 2008:
RS 475 FRACAS Principles
and Applications
in
Tucson, Arizona |
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November 20 - 21, 2008:
RS 490 Standards Based
Reliability Prediction
in
Tucson, Arizona |
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December 2008 |
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December 3 - 5, 2008:
RS 511 Application of
Reliability Growth Models in
Developmental Testing and Fielded
Systems
in
Tucson, Arizona |
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December 3 - 5, 2008:
RS 521 Advanced
Accelerated Life Testing Analysis
in
Tucson, Arizona |
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December 3 - 5, 2008:
RS 560 Fundamentals of
Design for Reliability
in
Singapore |
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December 10 - 12, 2008:
RS 588 DOE: Experiment
Design and Analysis
in
Tucson, Arizona |
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December 15 - 19, 2008:
RS 540 Reliability and
Maintainability Analysis for Repairable
Systems
in
Chennai, India |
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Contribute to HotWire |
Contributions Welcomed
As always, your feedback and contributions are appreciated.
ReliaSoft is able to provide the most user-friendly reliability
software packages and support because we listen to our
customers. This applies to our newsletters and publications as
well. We welcome any suggestions or contributions you may have
for Reliability HotWire. If you have a topic or article
that you think would be useful to the readers of Reliability
HotWire, feel free to contact us. |
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Copyright 2008 ReliaSoft
Corporation, ALL RIGHTS RESERVED
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