HDTenEightyP/NetNews huggingface dataset:
From: mwette@csi.jpl.nasa.gov (Matt Wette)
Subject: Re: Solution of matrix Equation AX=XB
Originator: mwette@mr-ed
Organization: Jet Propulsion Laboratory
Distribution: na
Date: Sat, 21 Nov 1992 17:49:43 GMT


In article <3784@news.cerf.net>, heimbold@nic.cerf.net (John Heimbold) writes:
|> In article <6611@dciem.dciem.dnd.ca> sjm@dciem.dciem.dnd.ca (Stewart Moorehead) writes:
|> >
|> > I am recording the 6D position (x,y,z,roll,pitch,yaw) of an object
|> > using two independant devices. Since these devices have different
|> > reference frames a transformation matrix, call it X, must be
|> > calculated. To calculate X, the equation AX=XB must be solved, with A
|> > and B being known 4x4 matrices. I have found two methods which claim to
|> > solve for X. They were proposed by Roger Tsai and Reimar Lenz (June
|> > 1989 IEEE Transactions on Robotics and Automation) and by C. C. Wang
|> > (April 1992). Both of these methods work if I pre-define X and create
|> > some 'cooked' data around it, however when I use actual data that was
|> > recorded using teh devices I get an incorrect answer. The devices being
|> > used are any two of : Northern Digital's Optotrak, Logitech's 3D mouse,
|> > and Polhemus Fastrak. I feel that the inherent error in these devices
|> > may be too great for the methods being used.
|> > I would appreciate it if anyone has information regarding these methods
|> > or the devices being used. If anyone has solved a similar problem
|> > please respond.
|> > You can send mail to sjm.dretor.dciem.dnd.ca
|> 
|> The problem as you stated it may or may not be well defined.
|> First of all, as stated, there may be many solutions for X
|> analogous to finding a set of eigenfunctions for X.  To see this,
|> consider A=B.  In this case X=0 is a solution as well as X equal
|> to the identity matrix.  This is one example of multiple solutions
|> to the equation.
|> 
|> Next, consider the problem definition.  Since you want to estimate
|> X, try a statistical estimation approach.  Formulate the problem
|> by doubling the number of measurements (assumming that they are
|> noisey) and then figure how to use this information to estimate
|> X.  A similar category of problem is in photogrammetry where one
|> estimates the location and orientation of a camera given the 
|> photograph and some measured points in the "true" scene.

Consider the following:
	A*X = X*B
is equivalent to 
	(A (x) I  -  I (x) B) * vec(X) = 0
where (x) is the Kronecker product and vec() is an operation which
stacks the columns of X into a vector.  Thus, the equation is a linear
system of 16 equations in 16 unknowns.  If A (x) I - I (x) B is full
rank then X=0 is the only solution.  Otherwise, the solution set is the
set of matrices X for which vec(X) spans the kernel of A (x) I - I (x) B.

Check out the following paper:

    author=     {P. Lancaster},
    title=      {Explicit Solutions of Linear Matrix Equations},
    journal=    {SIAM Review},
    volume=     {12},
    number=     {4},
    pages=      {544-566},
    month=      {October},
    year=       {1970}

Matt Wette
-- 
mwette@csi.jpl.nasa.gov
Newsgroups: sci.engr.control,sci.engr.civil,sci.engr.control
From: zwork@starfighter.den.mmc.com (Michael Corvin)
Subject: Re: Factory noise elimination2
Organization: Martin Marietta Astronautics Group
Date: Thu, 19 Nov 1992 21:48:06 GMT

In article <1992Nov19.170622.13991@mailer.cc.fsu.edu>, meyers@lorenz.ocean.fsu.edu (Steve Meyers) writes:
|> 
|> The name of the company is Andrea Electronic Corp. Anyone 
|> have an opinion on their new claims.
|> 
|> Steve

I have heard nothing about them.  However, I was wondering if
they are using active noise cancelling technology (?).  Some years
ago I saw a report (from England, I believe) about a noise
cancelling system used industrially on a gas turbine generator
exhaust stack.  A ring of drivers mounted around the stack were
driven with the phase-reversed noise signal and achieved a significant
reduction in the net noise strength.  They took an impressive amount
of wattage to run, but the power consumed was a small fraction of
the generator output.

A similar approach could be used in the vicinity of any noisy
machinery.  The acoustics would probably get difficult in diverse factory
environments, however.

Active noise reduction (ANR) is in use in a number of aviation
headsets.  The first commercial product was offered by Bose a
few years ago and there are now at least three other makers
offering them.  The passive attenuation properties of the headsets
reduce the higher frequency noise significantly (21dB is typical).
The ANR is used to reduce the mid to lower frequency noise.  Their
effectiveness is highly praised by pilots (who can afford them...).

-----------------------------------------------------------------------------
Michael Corvin 	      				zwork@starfighter.den.mmc.com
GN&C research & development 		   Martin Marietta Astronautics Group
-----------------------------------------------------------------------------
===============    My views, not Martin Marietta's   ========================
-----------------------------------------------------------------------------
Xref: sparky sci.engr.control:277 sci.aeronautics:2467 sci.engr:2282
From: vorwald@oasys.dt.navy.mil (John Vorwald)
Newsgroups: sci.engr.control,sci.aeronautics,sci.engr
Subject: Translating from Xanalog to Simulink
Date: 15 Nov 92 16:12:34 GMT
Article-I.D.: oasys.27497
Reply-To: vorwald@oasys.dt.navy.mil (John Vorwald)
Followup-To: sci.engr.control
Organization: Carderock Division, NSWC, Bethesda, MD

I will be translating several large simulation models from Xanalog to
Simulink.  I do not have any experience with Simulink (yet), but I have used
Systembuild extensively, and also Xanalog.
  Translating the low level algorithm files (Xanalog) to mex files (MatLab)
should be straightforward.  However, I am wondering if there is a translation
program for converting the block diagrams in Xanalog to the equivalent block
diagrams in Simulink.
  My present plan for translating the block diagrams is labor intensive: 
print the Xanalog block diagrams, then manually input the block diagram into
Simulink.  However, these are large simulation models with several layers of
block diagrams, and a large number of algorithm files.

Thanks for any suggestions

John Vorwald
P.S.  In a perfect world, ISI, Math Works, Xanalog, _______ (fill in your
favorite controls/simulation package) would adapt a common, interchangeable,
representation of systems.  In a less perfect world they would provide
translators.  In a minimal perfect world they would provide a text base
language to input the graphical block diagrams, instead of depending on point
and shoot devices for inputing the control structure.  Let's see, where do we
live...
Newsgroups: sci.engr.control
From: control3@McRCIM.McGill.EDU (Mark Readman)
Subject: environmental control systems
Originator: control3@gauguin.mcrcim.mcgill.edu
Keywords: HVAC agricultural control
Organization: McGill Research Centre for  Intelligent Machines
Date: Sat, 21 Nov 92 03:48:24 GMT



I am looking for references on modeling and control
of temperature, humidity, ventilation and how they interact
with each other. I have found some stuff in ASHRAE
but not much in control journals.
The application we have in mind is agricultural
so anything in tha area would also be of interest.
Thanks.
Mark.
-- 


------------------------------------------------------------------------------
Mark Readman                |  McGill Research Centre for Intelligent Machines
From: heimbold@nic.cerf.net (John Heimbold)
Newsgroups: sci.engr.control
Subject: Re: Solution of matrix Equation AX=XB
Date: 20 Nov 92 18:18:01 GMT
Distribution: na
Organization: CERFnet

In article <6611@dciem.dciem.dnd.ca> sjm@dciem.dciem.dnd.ca (Stewart Moorehead) writes:
>
> I am recording the 6D position (x,y,z,roll,pitch,yaw) of an object
> using two independant devices. Since these devices have different
> reference frames a transformation matrix, call it X, must be
> calculated. To calculate X, the equation AX=XB must be solved, with A
> and B being known 4x4 matrices. I have found two methods which claim to
> solve for X. They were proposed by Roger Tsai and Reimar Lenz (June
> 1989 IEEE Transactions on Robotics and Automation) and by C. C. Wang
> (April 1992). Both of these methods work if I pre-define X and create
> some 'cooked' data around it, however when I use actual data that was
> recorded using teh devices I get an incorrect answer. The devices being
> used are any two of : Northern Digital's Optotrak, Logitech's 3D mouse,
> and Polhemus Fastrak. I feel that the inherent error in these devices
> may be too great for the methods being used.
> I would appreciate it if anyone has information regarding these methods
> or the devices being used. If anyone has solved a similar problem
> please respond.
> You can send mail to sjm.dretor.dciem.dnd.ca

The problem as you stated it may or may not be well defined.
First of all, as stated, there may be many solutions for X
analogous to finding a set of eigenfunctions for X.  To see this,
consider A=B.  In this case X=0 is a solution as well as X equal
to the identity matrix.  This is one example of multiple solutions
to the equation.

Next, consider the problem definition.  Since you want to estimate
X, try a statistical estimation approach.  Formulate the problem
by doubling the number of measurements (assumming that they are
noisey) and then figure how to use this information to estimate
X.  A similar category of problem is in photogrammetry where one
estimates the location and orientation of a camera given the 
photograph and some measured points in the "true" scene.


-- 
-------------------------------------------
- John Heimbold  -  heimbold@cerf.net - -
-------------------------------------------    
Newsgroups: sci.engr
From: mike@drseus.jsc.nasa.gov (Mike Ross)
Subject: Re: Contraption building ideas?????
Organization: Lockheed Engineering & Sciences Company
Distribution: na
Date: Mon, 23 Nov 1992 16:51:36 GMT

One I saw in school was make an ordinary mouse-trap into a car,
and see which one goes the farthest on the energy stored in the
trap.  Winning model put vinyl LPs on each side (Barry Manilow,
I think :-) ), with string from trap bar to axle wraparound.


								Mike

-- 
******************************** mike@drseus.jsc.nasa.gov *****
* Michael L. Ross/C33 | Lockheed Engineering & Sciences Co.   *
* Robotics Department | 2400 Nasa Rd. 1, Houston, TX 77062    *
*(713)333-7094 voice,(713)333-7201 fax**********boring, eh?****
From: ps02@ns1.cc.lehigh.edu (PENELOPE E. SMITH)
Newsgroups: sci.engr
Subject: Re: disgusted engineer
Date: 17 Nov 92 19:56:53 GMT
Organization: Lehigh University

In article <1992Nov14.011351.12569@access.usask.ca>, choy@skorpio.usask.ca (I am
 a terminator.) writes:
 (etc  to the effect that an IE is discouraged with management having nothing
 to do with the actual productivity of the plant)

The correct attitude to take in this position is that you are being paid to
spend time at the plant doing nothing !  Of course, such a situation won't
last forever, but the IE has almost no power to change it at all.  Thus, the
IE should do two things:
    1) Stop being depressed - do a hobby or something outside work.
    2) Prepare for the inevitable, and find another job, or at least do
    professional development so he will be employable when the inevitable
    happens.
Of course, if the management is lying, then you don't have to exactly tell the
truth to management, either.  Don't lose sleep - find some **real** (by
your internal definitions) but small project, and do it for its own sake.  By the way,
the general low morale and depression indicates that you should consider
looking at the plant emissions within the building.

    Good luck,
-- 
 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Penelope E. Smith               PS02@NS.CC.LEHIGH.EDU
Department of Mathematics       PS02@LEHIGH.BITNET
Lehigh University
Bethlehem, PA
Xref: sparky sci.engr:2298 sci.engr.mech:550 comp.lang.fortran:4372
From: alan@dmsmelb.mel.dms.CSIRO.AU (Alan Miller)
Newsgroups: sci.engr,sci.engr.mech,comp.lang.fortran
Subject: Re: is there a PD s/w library for IMSL-like routinesin F77??
Date: 19 Nov 92 22:06:56 GMT
Organization: CSIRO, Div. of Mathematics & Statistics, Melbourne, Vic., AUSTRALIA

In article <1992Nov13.051437.2235@ucsu.Colorado.EDU> hatay@spot.Colorado.EDU (Ferhat F. Hatay) writes:
>In article <BxJ00w.A2o@acsu.buffalo.edu> v087mxgb@ubvmsd.cc.buffalo.edu (Shawn E Thompson) writes:
>>
>>hi all,
>>
>>
>>Can someone point me to a public domain source
>>(or some such thing) for some fortran subroutines
>>for matrix manipulation.
>>
>>
>>Thanks!
>>
>>
>>Shawn E. Thompson                        |Senior Engineer/Development Mgr 
>>v087mxgb@ubvms.cc.buffalo.edu            |Leica, Incorporated
>>University @ Buffalo                     |PO Box 123
>>Graduate School of Mechanical Engineering|Buffalo, NY 14240-0123
>>------------------------------------------+-----------------------------------
>>"Nothin ever grows in this rotten old hole, and everthing is stunted and lost..
>>and nothin really rocks n nothin really rolls and nothin's ever worth the cost"
>>                                                               --- Meatloaf
>
>
>Thanks to Dr. Jack Dongarra from Oak Ridge National Lab 
>and Dr. Eric Grosse from AT&T labs and the other workers 
>in the numerical analysis field. A public domain treasure
>is available to the users. Various eigenproblem, linear 
>algebra and numerical solvers are available. For more 
>information send e-mail with one line message
>
>  send index  
>
>  to netlib@research.att.com. 
>
>
>  Good Luck. 
>
>-- 
>Ferhat F. Hatay                        || Disclamer: |||||||||||||||||
>Aerospace Engineering Sciences         || I speak for myself unless || 
>University of Colorado, Boulder        || otherwise indicated.      ||
>e-mail: hatay@spot.colorado.edu        |||||||||||||||||||||||||||||||

Another alternative is the NSWC Maths library.   The only way I know of
getting a copy (it is only supplied in Fortran source form) is to write
to Dr. Alfred Morris, Engineering & Information Systems Dept., Naval
Surface Warfare Center, Dahlgren, VA 22448-5000, USA.   It covers roughly
the same subjects as NAG/IMSL.

-- 
Alan Miller, Quality Improvement Project
CSIRO Division of Mathematics & Statistics, Melbourne, Australia
Phone: +61 3 542-2266   Fax: +61 3 542-2474  E-mail: alan@mel.dms.csiro.au
Mail: CSIRO DMS, Private Bag 10, Clayton, Vic. 3168, Australia
Newsgroups: sci.engr
From: harald@efads2.tuwien.ac.at (Harald Stadlbauer)
Subject: MMS
Reply-To: harald@efads2.tuwien.ac.at (Harald Stadlbauer)
Organization: Technical University Vienna, INFA
Date: Tue, 17 Nov 1992 16:08:28 GMT


Please, can anybody tell me where I can find a detailed description of MMS 
(Manufacturing Message Specification)?

Many thanks

    Harald



-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
Harald Stadlbauer, Institute of Flexible Automation, Technical University of 
                   Vienna, Gusshausstr. 27-29, A-1040 Vienna, AUSTRIA
                   e-mail: harald@efads1.tuwien.ac.at
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
Newsgroups: sci.engr
From: drkhoe@nmt.edu (ONID)
Subject: Survey - Research
Organization: New Mexico Tech
Date: Thu, 19 Nov 1992 03:25:33 GMT

                              QUESTIONNAIRE
                         TO EXAMINE CAFFEINE USE
                        AMONG COMPUTER SCIENTISTS
                         AND ELECTRICAL ENGINEERS
                                     
Most of us enjoy consuming caffeine in one form or another. The purpose of
this questionnaire is to examine how much caffeine is being consumed, what
form the caffeine is being consumed in, and who is consuming it.

Please answer these questions with email to: bob@jupiter.nmt.edu
with the subject 'survey'.

**Please do not post your answers, that will waste bandwidth**

You don't have to quote the whole article, just use 6 lines or so:
EXAMPLE
	1 CS
	2 85 cans
	3 Jolt
	4 5 pots
	5 none (gives me a headache)
	6 45 Vivarin/hr.

Thank you!

1. What is your field of work/study?
    EE       CS        BothNeither

2. How much soda do you consume per day (average)?
    ________

3. What kind of soda do you drink?
    ________

4. How much coffee do you consume per day (average)?
    ________

5. How much tea?
    ________

6. Do you take any caffeinated pills? If so, how many?
    Vivarin  NoDoze    Maximum Strength Excedrin
    ______   ______    ______

bob@jupiter.nmt.edu
Bob "Chunkstyle" Broilo
-- 
----------------------------------------------------------------------------
Amiga to the Bone | SF2 Fanatics: Can you hang with the Guile combo's?
Moshing - the number one dance in America.  Kill the preacher hang the pope.
-------------------------------drkhoe@nmt.edu-------------------------------
From: dominick@protocol.zycad.com (Dom Paniscotti)
Newsgroups: sci.engr
Subject: Requirements Parsing
Date: 20 Nov 1992 11:58:36 -0500
Organization: Protocol, a Division of ZYCAD Corporation
Distribution: world
Reply-To: dominick@protocol.zycad.com
NNTP-Posting-Host: hayaku.protocol.zycad.com
Keywords: requirements


I'm interested in getting some information on the topic of
automated extraction of requirements from text.  If anyone
knows of any papers, programs, YACC grammers, ... etc, please 
let me know.

BTW, I'm not sure if this is the correct group to post in,
if you know of a better group, tell me, I'll post there instead. 

			Thanks,
				Dom
Newsgroups: sci.engr
From: jeffc@ee.ubc.ca (Jeffrey Chow)
Subject: Contraption building ideas?????
Organization: University of BC, Electrical Engineering
Distribution: na
Date: Sun, 22 Nov 1992 23:02:20 GMT

Hi,

  I'm leading a group of people in a contraption building activity.
I'm looking for ideas for contraptions which exploit creativity and
innovation on the part of the participants.       

  The people(mostly adults from late teens to mid 20s) will be given
approximately one hour to design and build the contraption to see who
has built the most engineeringly sound device.  I'm looking for contraption
ideals which do not require expertise in any specific area of engineering,
and would be cheap and fun to build.

  Some contraptions that have been built before include:
    - a contraption to protect a raw egg from cracking when dropped
        from a fixed height
    - paper plane with largest wingspan which could fly the farthest
    - balloon powered cardboard cars with the longest range

  Anybody got some other neat ideals????

  Thanks in advance,

    Jeff
Newsgroups: sci.engr
From: maven@lerc.nasa.gov (Larry Fishbach)
Subject: Re: Searching for free info....
Reply-To: maven@hercules.lerc.nasa.gov
Organization: NASA Lewis Research Center, Cleveland, OH
Date: Mon, 23 Nov 1992 13:26:48 GMT

In article <1992Nov22.201108.133437@ua1ix.ua.edu>, kkavikon@ha21.eng.ua.edu (Kishen Kavikondala) writes:
> Hi,
>  
>   Does anybody know of any Public domain on-line service for
>   tracking technical papers / books ? i.e for a particular
>   author, is there any way of getting a list of all his technical papers ?
>   Your help will be greatly appreciated.
> 
>   My e mail add. is sudh@comec4.mh.ua.edu
> 
>   Thanx in advance.
>   Sudhakar
> 
>   ~
>   ~
>   ~
> 

The NASA RECON System can do the searches you want.  I don't know
if it's free but you probably could contact NASA Marshall and ask
at the library there if it isn't free if they would do the search
for you.
-- 
*******************************************************************************
maven@hercules.lerc.nasa.gov   Larry Fishbach @ NASA Lewis Cleveland Ohio
"Everything here is my own opinion"   Quoth the Maven "Evermore"
*******************************************************************************
From: ucess2j@ucl.ac.uk (Dr Jaroslav Stark)
Newsgroups: sci.engr.civil
Subject: MSc in Structural Design
Date: 23 Nov 92 09:36:36 GMT
Organization: Bloomsbury Computing Consortium

**********************************************************************

MSc in Structural Design

**********************************************************************

The Department of Civil and Environmental Engineering at
University College London offers a unique new MSc in Structural Design.

Brief Details:

1 calendar year full-time, 2 calendar years part-time. Content: project based
course for the development of design skills; interpretation of briefs,
design thinking, teamwork, communication. Lectured modules in design
theory, creativity, qualitative analysis, history, building engineering,
construction economics and optional topics in advanced engineering
mechanics. Run in collaboration with leading firms of consulting 
engineers.

Course Tutor: Dr. John Eyre, Department of Civil and Environmental Engineering,
University College London, Gower Street, London WC1E 6BT. UK.
Tel: 071-387-7050, x 2718, Fax: 071-380-0986.

E-mail can be addressed to me (j.stark@ucl.ac.uk) and I will pass it on.
Distribution: world
Organization: Bloomsbury Computing Consortium, London
Keywords: 
Newsgroups: sci.engr.civil
From: echacon@dcc.uchile.cl (Ernesto Chacon)
Subject: Impermeabilizacion de puentes con geomembranas
Originator: echacon@dcc.uchile.cl
Date: Mon, 16 Nov 1992 22:48:42 GMT
Organization: Universidad de Chile, Depto. de Ciencias de la Computacion


       Necesito informacion sobre el uso de geomembranas y geotextiles en la
   construccion y reparacion de los tableros de los puentes de hormigon.
       Necesito saber las formas de construccion, normas sobre los ensayos
   que se le deben realizar, y especificaciones de las caracteristicas que 
   deben cunplir estos materiales para su buen funcionamiento.

                                        Ernesto
                               echacon@anakena.dcc.uchile.cl
From: drparul@sportster.ksu.ksu.edu (TRANSCEND  G O D)
Newsgroups: sci.engr.civil
Subject: expert system shell pc+
Date: 19 Nov 1992 12:32:04 -0600
Organization: Kansas State University
NNTP-Posting-Host: sportster.ksu.ksu.edu

 i have trouble in running pc+ a developement shell for an
 expert systems.

 the problem is not during developement of expert system but
 during preparation of runtime version of developed expert system
 it gives problem..

 if any one has any idea or experience with pc+   
 help me in solving this problem...

 thanks in advance


shri j kotdawala

drparul@matt.ksu.ksu.edu
From: jimb@orion.oac.uci.edu (Jim Barrera)
Subject: Re: Gender depicting pictograms
Newsgroups: sci.engr.civil
Organization: University of California, Irvine
Date: 16 Nov 92 16:18:40 GMT
Distribution: sci

So spake Bob von Buelow <bobv@spike.Jpl.Nasa.Gov>:

> Recently the subject of pictograms for restroom/toilet doors came up
> over in alt.folklore.urban.  One gentleman claims he has seen the
> symbol 'circle' on a mens room and the 'triangle' on women's.  Others
> doubt this and my personal experience has been the reverse, that is
> 'triangle' for men and 'circle' for women.  Is there a civil engr
> handbook that would identify the correct symbol usage?

You are correct.  The use of  circle = woman  and  triangle = man
is what is traditionally used on genealogical charts.  

I don't know of any specifications or codes which require these
symbols.  The Uniform Building Code doesn't seem to say anything
about it.  Try asking some architects.

`jimb