HDTenEightyP/NetNews huggingface dataset:
From: bai@rainier.eng.ohio-state.edu (Baback A. Izadi)
Newsgroups: comp.parallel
Subject: Torus vs. Hypercube
Date: 27 Dec 92 20:19:10 GMT
Organization: The Ohio State University Dept of Electrical Engineering

Couple of weeks ago, I think heard a speaker claiming that
2-dimensional Torus and hypercube have basically the same
topology. How could this be true? If it is, can someone
point me to some references?

Thank you

Baback
Newsgroups: comp.parallel
From: maniattb@cs.rpi.edu (Bill Maniatty)
Subject: Re: Torus vs. Hypercube
Apparently-To: comp-parallel@cis.ohio-state.edu
Organization: Clemson University
Date: Wed, 30 Dec 1992 23:13:59 GMT

In article <1992Dec30.212717.23993@hubcap.clemson.edu>, heller@Think.COM (Steve Heller) writes:
|> In article <1992Dec30.124438.28257@hubcap.clemson.edu> maniattb@cs.rpi.edu (Bill Maniatty) writes:
|> 
|>    |> The fact that the 4^2 torus is isomorphic to the binary 4-cube led to an
|>    |> interesting question here at TMC about six months ago.
|>    |> 
|>    |> Is the 4^k torus isomorphic to the binary 2k-cube?
|>    |> 
|>    |> The answer and the proof (which I found quite fun) is left as an excercise
|>    |> to the reader.
|> 
|>    Is this a closely guarded corporate secret :-) ?

Sorry, I just couldn't resist teasing.  Thanks for posing an interesting problem
Steve.

|> 
|> NOT!  I'll be glad to send more information to anyone who wants it.  I
|> didn't want to spoil a fun excercise, though.  And besides, after many
|> years in school, it's fun to be able to use that phrase oneself.
|> 
|> -steve
|> 

Actually we did this one in our office, and have a surprisingly
simple informal solution to it.  This is an interesting result.

Bill
-- 
|
|	maniattb@cs.rpi.edu - in real life Bill Maniatty
|
From: vasu@anolis.bnr.usu.edu (Vasu Nugala)
Newsgroups: comp.parallel
Subject: Re: Parallel OS
Keywords: Chorus, Mach, Helios
Date: 28 Dec 92 01:55:47 GMT
Reply-To: vasu@anolis.bnr.usu.edu (Vasu Nugala)
Organization: Utah State University, Logan, UT.

In article <1992Dec21.153610.2810@hubcap.clemson.edu> David Phelps writes:
|>I wonder if anyone out there can help me on the subject of the following
|>parallel operating systems :
|>
|>Helios
  This is actually not an operating system but is a shell which incorporates
  all the necessary inter communication facilities for distributed computing
  applications. hack in ftp.uni-kl.de in /pub2 for better details. I know this
  site has some info. but am not sure whether it serves your purpose or not.
|>Chorus
  This is actually developed by Chorus Systems from France. you can get some
  info from faui43.informatik.uni-erlangen.de in pub/doc/chorus.
|>Mach
  This has ipc done by using tasks and threads and other stuff. some info (an      understatement) is available in cs.cmu.edu in /mach3.

  Hope these are of any help. cheers :-)

------------------
   Vasu Nugala
   e-mail: vasu@dim.cs.usu.edu       USnail:
                or                     PO Box 1336
           vasu@anolis.bnr.usu.edu     Logan, UT 84322.
   Phone: (801) 752-1241
Newsgroups: comp.parallel,comp.object
From: erwin@trwacs.fp.trw.com (Harry Erwin)
Subject: Re: Load balancing in object-oriented systems
Apparently-To: comp-parallel@uunet.uu.net
Organization: TRW Systems Division, Fairfax VA
Date: Mon, 21 Dec 1992 18:11:11 GMT

I haven't seen much useful on computer performance engineering in
object-oriented systems, particularly those like Smalltalk-80 or my C++
multitasking stuff, where a lot of CPU is used up by the executive. I will
say that even some Ada tasking environments show evidence that the
programmers don't understand these issues. (Integrating inter-task and
external IO tends to be a pain and a half, since both the operating system
and the executive are messing around with the same task input queues.)
Running a debugger can be eye-opening, particularly if there is a lot of
inheritance and objects are being zeroed at allocation, as required by the
TCSEC. Since load-balancing requires some sort of predictive model for the
load generated by specific applications, the potential for unstable
behavior and thrashing is significant. I've done some work here, but not
enough.

Checking the CMG and SIGMETRICS back issues, it doesn't look like there's
much that has been published. If you come up with something, you might
think about publishing. An article titled "CPE for OO Systems" would
probably be an automatic "accept" for CMG' 93. Think about it.

Cheers,
-- 
Harry Erwin
Internet: erwin@trwacs.fp.trw.com


Newsgroups: comp.parallel
From: heller@Think.COM (Steve Heller)
Subject: Re: Torus vs. Hypercube
Organization: Thinking Machines Corporation, Cambridge MA, USA
	<1992Dec29.210648.18508@hubcap.clemson.edu>
	<1992Dec30.124438.28257@hubcap.clemson.edu>
Date: 30 Dec 92 10:05:09

In article <1992Dec30.124438.28257@hubcap.clemson.edu> maniattb@cs.rpi.edu (Bill Maniatty) writes:

   |> The fact that the 4^2 torus is isomorphic to the binary 4-cube led to an
   |> interesting question here at TMC about six months ago.
   |> 
   |> Is the 4^k torus isomorphic to the binary 2k-cube?
   |> 
   |> The answer and the proof (which I found quite fun) is left as an excercise
   |> to the reader.

   Is this a closely guarded corporate secret :-) ?

NOT!  I'll be glad to send more information to anyone who wants it.  I
didn't want to spoil a fun excercise, though.  And besides, after many
years in school, it's fun to be able to use that phrase oneself.

-steve

Newsgroups: comp.parallel
From: David Karr <karr@cs.cornell.EDU>
Subject: Re: Torus vs. Hypercube
Apparently-To: comp-parallel@eddie.mit.edu
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
Date: Tue, 29 Dec 1992 01:22:33 GMT

In article <1992Dec27.201910.28352@ee.eng.ohio-state.edu> bai@rainier.eng.ohio-state.edu (Baback A. Izadi) writes:
>Couple of weeks ago, I think heard a speaker claiming that
>2-dimensional Torus and hypercube have basically the same
>topology. How could this be true?

First of all, I was under the impression that the usual interpretation
of a "torus" network was *always* 2-D.  Perhaps the speaker meant "2-D
hypercube," i.e. the 4-node hypercube, which would in fact match the
4-node 2x2 torus.

Also, it turns out the 16-node (4-D) hypercube and the 16-node 4x4 torus
have the same topology.  But that's the largest number of nodes for
which this can occur, because in higher dimensions the hypercube nodes
have degree 5 or greater, but the torus nodes have degree 4.

>If it is, can someone
>point me to some references?

Leighton has lengthy discussions about both 2-D arrays (including the
torus) and hypercubes, but none that I recall about this point.

-- David Karr (karr@cs.cornell.edu)
From: tbruseha@hollywood.ems.cdc.com (Tom Brusehaver)
Newsgroups: comp.robotics
Subject: Re: DOS in real-time, is there a problem?
Date: 22 Dec 92 14:36:26 GMT
Organization: Empros Systems International, a division of Ceridian

In article <1992Dec20.153543.537@doc.bmd.trw.com> nickgill@doc.bmd.trw.com writes:
>Hello,
>
>I am looking for any information on DOS in a real-time enviroment.
>Please e-mail me if you know of any leads on problems that occured
>in a real-time environment or on embedded computers as a result of DOS.
>Thanks,
>Nick

I once supported a real-time monitoring system in a factory that was
on a [MS]DOS system.  The whole thing was written in Turbo Pascal, and
used a non-standard graphics display (NEC PC-8000), most of the
comments in the code were in japanese, as were some of the function
names (jikan=time).

Bascially there was a central launcher program that would fork off the
actual working tasks.  The one task would read the inputs, and put the
values in a shared memory area.  The next task would process this
fresh data.  The next task was based on the current display desired,
and would put the appropriate information on the screen.  I think this
task would also poll the touch screen (another mess in itself).

The main screen would show a summary of the factory.  The next screens
would show the 5 individual areas.  Then there was an individual item
display showing status.  There was also some end of month reports, and
end of year reports.

The biggest problem with this whole system was the polled nature.
There were no event driven interfaces (although I suppose there could
have been.  The touch screen processor (yup, a whole processor
dedicated to the screen), queued about 10 actions (touch, release 2
actions, although drag didn't work, and my japanese wasn't good enough
to figure out if it were possible).  The actual problems were reported
down a serial line, and that had a huge buffer also.

Also if there were any loops, or any of the modules launched never
came back, nothing got serviced.  The display looked like everything
was working, but something else would report that error.

Tommy
From: Don.Golding@f2206.n124.z1.fidonet.org (Don Golding)
Sender: FredGate@ocitor.fidonet
Newsgroups: comp.robotics
Subject: IT'S TIME TO UNITE!
Date: Wed, 23 Dec 1992 01:48:01

I know how you feel.  I started Angelus Research for robotics 
products.  My first is Whiskers the Robot.  He is an intelligent 
robot using the 68HC11 as his brain.  He can hear, sing, avoid 
obstacles using and multitasking preemptive background task.  All 
for $395.  I will send you some literature.
 * Origin: The Interocitor*AI/Robotics*214-258-1832 (1:124/2206)
From: sinster@cse.ucsc.edu (Darren Senn)
Newsgroups: comp.robotics
Subject: Miniboard parts kits.  My response.
Date: 29 Dec 92 21:00:45 GMT
Organization: University of California, Santa Cruz
NNTP-Posting-Host: tioga.ucsc.edu

[flame mode on]

I have explained this about a dozen times before.  I'm getting thoroughly
pissed off.

There were 183 kits ordered.  It's been taking me, on average, about 4
hours to pack each individual kit and double-check the contents.  That's a
total of about 700 hours of work.

I was a part time student, and a 3/4 time worker.  That means I had absolutely
no time during the week to work on this.  If I spend 32 hours every weekend
on this (that leaves no time for homework, eating, cleaning the house, etc.),
that's 20 weeks!

I've been working my butt off every weekend since mid-November when
I got the first set of parts from the suppliers.  I worked clean through
Thanksgiving vacation and all during Christmas vacation.  I even worked
during finals week for you people!

Of the 6 people who volunteered to help me pack, not a single person helped.

I've now got one person who's volunteered to help me one day this coming
weekend.  And i'm happy as hell for it.

But I'm sick and tired of working my ass off for you thankless curs and
getting complaints over and over for how long this has been taking.  You
think I'M happy about it?!

When I first noticed that it was taking longer than I thought to do
this, I started sending orders out with next day air mail using my own
money.  That was far too expensive, so I stopped.  I've already lost
more than $400 on this, and I've still got lots of kits to ship!

A couple people were kind enough to send me thank you notes.  For those
people I'm thankful.  I appreciate it, but it hasn't made much progress
towards making this worthwhile.

If you don't believe this post, I still have all receipts and documentation.

[flame mode off]

I've finished my tirade.  Now back to your regularly scheduled programming.
From: rg@msel.unh.edu (Roger Gonzalez)
Newsgroups: comp.robotics
Subject: Re: Denning Mobile Robotics Address?
Date: 20 Dec 92 12:08:33
Organization: Denning Mobile Robotics
NNTP-Posting-Host: nymph.msel.unh.edu
In-reply-to: doug@cc.gatech.edu's message of Thu, 17 Dec 1992 02:10:21 GMT

>>>>> "Doug" == Doug MacKenzie <doug@cc.gatech.edu> writes:

Doug> Denning is not on the Network.

Well, not officially, but unofficially very much so.

-Roger
 
--
ARTIFICIAL FLOWERS:  Pieces of plastic and metal, crudely fashioned to
  bear a limited, superficial resemblance to real flowers, but with no
  credible attempt to match their internal complexity in terms of form,
  function, or behavior.

ARTIFICIAL INTELLIGENCE: Really smart computers.

Roger Gonzalez - rg@msel.unh.edu     (508) 658-7800 (fax -2492)
Denning Mobile Robotics, 21 Concord Street, Wilmington MA 01887
Newsgroups: comp.robotics
From: gat@forsight2.jpl.nasa.gov (Erann Gat)
Subject: Re: RWI Address Needed
Organization: Jet Propulsion Laboratory
Date: Tue, 22 Dec 1992 17:02:48 GMT

In article <7240@sersun1.essex.ac.uk> callv@essex.ac.uk writes:
>
>I should be very grateful if someone could send me the address
>of RWI (Real World Interface) who make small mobile bases. Their
>address is not in the FAQ (although they are mentioned in the
>list of mobile robot companies).

Real World Interface
P.O. Box 270
Dublin, NH 03444

(603) 563-8871

E.

Newsgroups: comp.robotics
From: fculpepp@norfolk.vak12ed.edu (Fred W. Culpepper)
Subject: Re: IR remote timing
Organization: Virginia's Public Education Network (Norfolk)
Date: Tue, 22 Dec 92 15:57:34 GMT

Check the post on infrared that appears earlier in this
newsgroup.  I think it might contain the information you want.

Fred Culpepper

fculpepp@norfolk.vak12ed.edu

---
Newsgroups: comp.robotics
From: carrasco@bcars103.bnr.ca (Sylvano Carrasco)
Subject: Re: 68hc11e2fn cancelled?!?!?!
Organization: Bell-Northern Research Ltd, Ottawa, Canada
Date: Tue, 22 Dec 92 21:12:53 GMT

In article <QfBnlsO00YUoQO034q@andrew.cmu.edu>, cb1p+@andrew.cmu.edu (Chris Beasley) writes:
|> I have been talking to a lady named Dee at Motorola at 800-392-2016 and
|> she is telling me that the 68hc11e2fn has been "cancelled" and that
|> the new part number replacing it is the 68hc11811e2fn.
|> 
|> Does anybody have any information about this?  Is this new part going
|> to work with the miniboards?  I have a cuple of samples of the e2fn on
|> order but they are not to be forthcoming and she sez the 811e2fn will.
|> 
|> I hope this is going to work with the miniboards because otherwise I
|> am like David Byrne...  "Still waiting!  A-A-Ahm Still waiting!" :-(
|> Cb

Chris,
I beileve that the recommended processor for the miniboard is the

68HC811E2FN

not the 68HC11E2FN. I'm not sure what the 68HC11811E2FN is. Double-check
Fred Martin's docs on that chip number, then check with Dee again.

Merry Xmas
-----------
Sylvano

+------------------+------------------------------+----------------+
|  Sylvano Carrasco|   Bell-Northern Research     |  #define       |
|  (613) 763-4109  |   P.O. Box 3511 Station 'C'  |     Opinions   |
|                  |   Ottawa, Ontario.           |        My_Own  |
|  CARRASCO@BNR.CA |   Canada.  K1Y 4H7           |                |
+------------------+------------------------------+----------------+
Xref: sparky comp.robotics:2720 rec.crafts.metalworking:40
From: mww@eng.cam.ac.uk (Mark Wright)
Newsgroups: comp.robotics
Subject: robot arm info required
Date: 21 Dec 92 13:44:37 GMT
Distribution: comp.robotics
Organization: Cambridge University Engineering Department, UK

Hello,
      I have to quickly aquire a robot for research into eye/hand
coordination, structure from motion and neural net control for several
students. This would have to be towards the cheaper end of the market
or a second hand machine (approx 11k pounds). I would welcome general
advice and experiences of specific models from end users.

NB. I have looked through comp.robotics FAQ and archive.
A rough spec would be:
1. preferably 6 degrees of freedom (5 acceptable if too costly).
2. repeatability approx of 0.1mm.
3. speed approx 1000mm/sec or better.
4. payload approx 2kg or better.
5. ability to program in world and tool coordinates.
6. ability to interface at a lower level for students interested
   in research into control algorithms.
7. ability to incrementally change path in realtime
   according to information from vision and other sensors.

Of particular importance is the last point, I notice that most
of the cheaper robots use rs232c interfaces, I wonder what kind of
cycle times people are getting for this kind of sensor control loop.

Models I have considered are: Scorbot-er VII, Movemaster EX RV-M1 etc.
Has anyone got experience of these or could suggest others?
All information gratefully recieved.
-------------------------------------------------------------
Mark Wright
Speech, Vision and Robotics Group
Cambridge University Engineering Department
Trumpington Street, Cambridge, England CB2 1PZ
Tel: +44-223-332754 Fax:+44-223-332662
EMail: mww@eng.cam.ac.uk
-------------------------------------------------------------
From: cb1p+@andrew.cmu.edu (Chris Beasley)
Newsgroups: comp.robotics
Subject: 68hc11e2fn cancelled?!?!?!
Date: 22 Dec 92 06:04:08 GMT
Article-I.D.: andrew.QfBnlsO00YUoQO034q
Organization: Carnegie Mellon, Pittsburgh, PA

I have been talking to a lady named Dee at Motorola at 800-392-2016 and
she is telling me that the 68hc11e2fn has been "cancelled" and that
the new part number replacing it is the 68hc11811e2fn.

Does anybody have any information about this?  Is this new part going
to work with the miniboards?  I have a cuple of samples of the e2fn on
order but they are not to be forthcoming and she sez the 811e2fn will.

I hope this is going to work with the miniboards because otherwise I
am like David Byrne...  "Still waiting!  A-A-Ahm Still waiting!" :-(
Cb
From: sinster@cse.ucsc.edu (Darren Senn)
Newsgroups: comp.robotics
Subject: Re: Darren Senn: where is my kit?
Date: 29 Dec 92 20:30:03 GMT
Organization: University of California, Santa Cruz
NNTP-Posting-Host: tioga.ucsc.edu

In article <1992Dec29.101725.1@hiramb.hiram.edu> bushbo@hiramb.hiram.edu writes:
[...]
>This september i placed an order with you for the miniboard kit, and i 
>expected to receive it late Oct. or early Nov. and i have yet to receive it
>to this date...what happened? I would like you to put a tracer on the package
>if it was sent else send me the kit or refund my money! I would like to have
>my kit soon for i am in desperate need to put my ideas to work...thanks

I have been trying to get in contact with your for three months.  Your
email address has never worked.  I can't send packages to P.O. Boxes,
and you never sent me postage for your order.

I'm posting this personal message to netnews, despite the fact that it
violates USENET courtesy, because nothing else has worked.

Jeez.
From: sarkar@tuna.cis.upenn.edu (Nilanjan Sarkar)
Newsgroups: comp.robotics
Subject: Help for Technical Report from CMU
Date: 31 Dec 92 21:13:46 GMT
Distribution: usa
Organization: General Robotics and Active Sensory Perception (GRASP) Lab, 
	      University of Pennsylvania

Hi,
	I need to locate a technical report from Robotics Institute, CMU
which has been suggested by a reviewer of my paper. 

	The number is: CMU-RI-TR-86-4 by Wallace et. al.

Now, is there any FTP site for TR? Otherwise, could you please let
me know the address I should write to?

Actually, I need a reference of a method called "pure pursuit" which
is supposedly mentioned in that TR at page 65. I know, it is asking
a bit too much, but I will be immensely grateful if anyone could mail
me a copy of that TR or at least photocopies from say page 60-70. I will
bear all the expenses.

I will truly appreciate any help. Thanks a lot. Have a happy new year.

--Nilanjan



Newsgroups: comp.robotics
From: rsdoyle@swift.cs.tcd.ie
Newsgroups: comp.robotics
Subject: Prometheus (European Project) Information sought
Date: 20 Dec 92 22:59:56 GMT
Organization: Computer Science Department, Trinity College Dublin


	I am looking for information on the European project 'Prometheus'.
If there is anyone out there who is either working on this project or
who knows about it, I would like to find out as much about it as I can.

Thank you

Rory Doyle
email: rsdoyle@cs.tcd.ie
From: cpg@cs.utexas.edu (Carlos M. Puchol)
Newsgroups: comp.robotics
Subject: Re: Miniboard parts kits
Date: 24 Dec 1992 16:11:08 -0600
Organization: Department of Computer Sciences, UT Austin
NNTP-Posting-Host: thor.cs.utexas.edu

sinster@cse.ucsc.edu (Darren Senn) writes:
! cpg@cs.utexas.edu (Carlos M. Puchol) writes:
!
!!I remember seeing some messages about some people not having received
!!the parts kits from Mr. Darren Senn. I haven't received the kits
!!yet and he doesn't answer the mail. Could someone post his (new?) telephone
!!for all those  who have not received the kits. I would like to have a chat
!!with him.
!
!I've been answering mail and getting kits out.  I know this is going much
!longer than it should have, but please bear with me.  My phone number is
!down below, in my .signature.
!-- 
!Darren Senn                                            Phone:    (408) 454-9074
!sinster@scintilla.capitola.ca.us                       Snail:     129 Goss Ave.
!Wasurenaide -- doko e itte mo soko ni anata wa iru yo.     Santa Cruz, Ca 95065

Well, I sent Darren Senn some mail (to both the new and old addresses), have
called him several times these last days, and noone answers the phone ... and I
haven't received the kits nor any reply ... when are we going to receive them?
I bought a batch for some people and me, and they are also worried.

I wonder how many people is out there that has not received the kits.

-- Carlos

Newsgroups: comp.robotics
From: Clint.Laskowski <Clint.Laskowski@mixcom.mixcom.com>
Subject: GET A LIFE!
Organization: Milwaukee Internet Xchange BBS, Milwaukee, WI U.S.A.
Distribution: usa
Date: Thu, 31 Dec 1992 18:59:03 GMT

In <C04q71.n24.2@cs.cmu.edu> fitz@frc.ri.cmu.edu (Kerien Fitzpatrick) writes:

>I don't know about others, but if all this group is going to be is a
>pissing match about miniboard kits then let's get another group going
>or send these guys off to a miniboard group.

>This is COMP.ROBOTICS ----- not comp.miniboards.where's.my.order.

[ more drivel deleted ]

Hey, there is not that much that goes on in this newsgroup
anyway... why not let the people who have something to say
about one of the most interesting developments in this
newsgroup (ie. the miniboard) say it?

I believe Darren's problems in completing all the miniboard
orders has a lot to do with robotics and its maturing as an
industry of the future.

So why don't you just ignore the posts if you don't like 'em?

How do others feel?

- Clint

-- 
===============================================================================
CLINT LASKOWSKI                                           Home:  (414) 571-0739
435 Southtowne Drive, Apt. J-202                    Voice Mail:  (414) 778-7675
South Milwaukee, Wisconsin  53172          Internet: clint.laskowski@mixcom.com
===============================================================================
Newsgroups: comp.robotics
From: epperson@adobe.com (Mark Epperson)
Subject: What is the MiniBoard???
Organization: Adobe Systems Incorporated
Date: Tue, 22 Dec 1992 21:39:45 GMT

Can someone post the specifications, cost and ordering information to the net?

Mark Epperson
Newsgroups: comp.robotics
From: cs911225@ariel.yorku.ca (KEN E WILLMOTT)
Subject: IR remote timing
Organization: York University, Toronto, Canada
Date: Mon, 21 Dec 1992 16:51:53 GMT

Hi,
I found the postings about the Sony infrared remote control
protocol interesting, but I was alarmed to note that it did
not seem to mesh with the readings I got from 3 different
controls in use in my living room. These are an RCA t.v.,
an Onkyo receiver, and a Jerrold tuner.

Here is what I found (presence of signal = logic 1):

First, there is an AGC stabilization pulse, followed by a short
break. Then come the mysterious bit patterns (I'll get to them).

Signal			Duration	Polarity
------			--------	________

AGC pulse		18.5 ms		1
pause			850 us		0
50 3-bit patterns	1125 us		(see below)

Each 3-bit patterns consists of three 375 us. long bits.
The first two are always the same, and convey the binary
information. The last is always set to 0.

When these bits are laid out end to end, they look like
the following (actual data from one of my controllers):

11 01 11 01 10 10 10 11
01 01 10 10 11 10 10 10
10 11 11 01 11 11 01 01
01

There are two interesting features of this stream, neither
of which I am sure is always true, or merely an artifact
of the particular button I chose.

1) The pattern 00 never appears
2) The pattern 10 never precedes the pattern 01

If anybody out there has more information to add to this,
I would be eternally grateful.

	-Ken