[std-interval] Re: applications in space science
Mihály Csaba Markót
markot at sztaki.hu
Thu Aug 17 13:23:07 PDT 2006
Dear Colleagues,
I would like to add some comments to the discussion as a Technical
Officer of the mentioned study: (The T.O. title means that I represented
the ESA side which awarded a research contract in this subject.)
- The study was intended to be a very initial assessment of the
applicability of interval ODE solvers for special space flight problems.
Because of the short contract period (4 months) I did not expect any
particularly detailed results.
- The numerical results indeed proved that the tested existing
general-purpose, "off-the-shelf" interval solvers are not comparable
with non-interval ones in term of the time of propagation, due to the
overestimation. Nothing really surprising...
- Note that the study was done by a team which has primary focus on
space research and had less previous expertize with interval tools.
Unfortunately, I was not successful with my plan to award a parallel
contract also to a primarily interval-oriented team. This way I got a
report on "what happens in some simple scenarios", but nothing on "why
the interval solvers fail so earlier" and "how to improve/tune these
solvers to achieve better results".
- All in all, I still find this study as a good "ammunition" - not
because of the achieved results but because we pointed out the need of
reliable methods in this field and made some initial contacts with the
space science community - in the hope of further collaborations.
Regards,
Mihaly
--
Dr. Mihaly Csaba Markot
Computer and Automation Research Institute
Hungarian Academy of Sciences
Phone: +36 1 279 6112, Fax: +36 1 209 5267
----------------------------- Original message -----------------------------
Subject: Re: [std-interval] FW: applications
Sent by: "Lawrence Crowl" <lawrence.crowl at gmail.com>
Date: Thu, August 17, 2006 12:24 am
Address: "For discussions concerning the C++ standardization of
intervals" <std-interval at compgeom.poly.edu>
--------------------------------------------------------------------------
I'm not an expert in the domain, but my read of the conclusions
is that the interval approach wasn't helpful. Apparently, the
integration process failed far earlier than non-interval integration.
How are we interpreting the conclusions differently?
On 8/15/06, George Corliss <George.Corliss at marquette.edu> wrote:
> > Friends,
> >
> > Ned Neddialkov had sent this pointer which may be of interest to
this list
> > for use as "ammunition" that intervals are good.
> >
> > ------ Forwarded Message
>> > > From: Ned Nedialkov <nedialk at mcmaster.ca>
>> > > Date: Thu, 27 Jul 2006 13:45:01 -0400
>> > > Subject: applications
>> > >
>> > > I discovered recently a very thorough study of applications of
>> > > interval methods, in particular integration, to space flight
mechanics:
> >
http://www.esa.int/gsp/ACT/doc/ACT-RPT-04-4105-ARIADNA-Assessing_the_Accurac
> > y_of_Interval_arithmetic_Estimates.pdf
> >
> > ------ End of Forwarded Message
> >
> > The ESA Technical Officer, Mihaly Markot, was a student of Tibor
Tsendes.
> >
> >
> > Dr. George Corliss
> > Electrical and Computer Engineering
> > Marquette University
> > P.O. Box 1881
> > 1515 W. Wisconsin Ave.
> > Milwaukee, WI 53201-1881
> > George.Corliss at Marquette.edu
> > 414-288-6599 (office); 288-4400 (GasDay);
> > 288-6280 (Dept.); 288-5579 (fax)
> > Office: Haggerty Engineering 296
> > Www.eng.mu.edu/corlissg
> >
> >
> > _______________________________________________
> > Std-interval mailing list
> > Std-interval at compgeom.poly.edu
> > http://compgeom.poly.edu/mailman/listinfo/std-interval
> >
-- Lawrence Crowl _______________________________________________
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