simulation@uflorida.cis.ufl.edu (Moderator: Paul Fishwick) (08/22/89)
Volume: 10, Issue: 5, Tue Aug 22 09:55:05 EDT 1989
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| TODAY'S TOPICS |
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(1) On a Quote from Sim. Digest
(2) Printed Circuit Board Simulator Wanted
(3) Modeling with Systems Dynamics
* Moderator: Paul Fishwick, Univ. of Florida
* Send topical mail to: simulation@bikini.cis.ufl.edu OR
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Return-Path: <popeye!srcnance@vtodie.cs.vt.edu>
Date: Mon, 14 Aug 89 09:00:52 edt
From: popeye!srcnance@vtodie.cs.vt.edu
To: vtodie!simulation@bikini.cis.ufl.edu
Subject: Quote from Recent Simulation Digest
Cc: fishwick\@bikini.cis.ufl.edu@vtodie.cs.vt.edu
The quote from Nietzsche in a recent Simulation Digest provides
a good sized "meal for thought:"
There are terrible people who, instead of solving a problem, bungle it
and make it more difficult for all who come after. Whoever can't hit
the nail on the head should, please, not hit it at all. --- Friedrich Nietzsche
As one who enjoys restoring old cars, I have uttered something
similar (but not so elegantly) on several occasions. Yet, the
contrary argument is that research often proceeds through the
partial successes of several and not the brilliance of only one.
This "thought meal" also serves up a common dish in computer
science: "just because I call it a ______ does not mean that
it is the _____ that everyone else is talking about." To clarify,
I attended the Washington Ada Symposium in June and heard several
talks on object oriented design and reusability. Strangely (to me)
in two talks which lauded the virtues of ood, the terms "inheritance"
and "class" were not used. When I asked about the absence of the
former (which, knowing a little about Ada, I could have provided
AN answer), the presenter informed that object oriented design
as espoused by Booch was different from object oriented programming
(and presumably what some have called the object oriented paradigm).
You can guess my reaction to this -- it will remain uncharacterized
in print.
Dick Nance
nance@vtopus.cs.vt.edu
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Date: Wed, 16 Aug 89 15:57:37 -0200
From: hbr@elctr.dk (Hans B| Randgaard)
To: simulation-request%dkuug@bikini.cis.ufl.edu
Subject: repost of PCB simulator query
Subject: Repost: Public domain Printed Board Circuit SIMULATOR wanted
Newsgroups: comp.misc,comp.lsi.cad,comp.lsi,comp.simulation
Keywords: stuck-at-zero stuck-at-one stuck-open shorts
This is a repost. I didn't get ANY ANSWERS(from the whole
world) AT ALL the last time I made the query.
Maybe it was the wrong news groups, maybe nobody know of any
such thing which is public or maybe the query is too silly to
answer; I don't know. But couldn't any of you who are into this
please give me a response.
---------------------------------------------------------------
I represent a sub-project in an independent project consortium
developing software and hardware for test of PCBs(printed circuit
boards) and components containing the relatively new concept:
Boundary Scan(also referred to as JTAG V2.0 and IEEE P1149.1).
I would be very happy if someone would give me a reference for a public
domain PCB SIMULATOR, which will simulate the following faults:
stuck-at-zero
stuck-at-one
stuck-open
and shorts
or at least just some of them.
We are going to use the simulator to assist our diagnostic tools to
verify PCB boards(using boundary scan), which is supposed to be
tested on a variety of testers. To ensure NOT to treat somebody
unfairly and choose a commercial simulator we will try to
base the diagnostic tools on a public domain simulator.
I will appreciate if answers will be mailed to me.
Thanks in advance.
Hans Randgaard.
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From: Bill Harris <billh@hplsla.hp.com>
Subject: Question for Simulation Digest
To: simulation@bikini.cis.ufl.edu
Elmto: simulation@uflorida.cis.ufl.edu
Date: Mon, 21 Aug 89 11:22:04 PDT
Return-Receipt-To: billh@hplsla.hp.com
X-Mailer: Elm [version 1.7]
Over the past couple of years, I've become interested in using systems
dynamics as a modeling and simulation tool to study the ramifications of
business decisions in practical situations. However, I haven't found much
recent literature on this topic. Furthermore, some of Forrester's original
work seems predicated on the notion that the nature of the nonlinearities
in a typical nonlinear differential equation tend to make it rather
insensitive to parameter values. However, recent reading that I've done on
the chaotic behavior of nonlinear differential equations would indicate
that this is a dangerous assumption to make.
Can anyone give me a brief summary of the present thinking on the
application of system dynamics? I realize that it has always been a
somewhat controversial approach to modeling, but I'm curious if it has
totally fallen into disfavor. If so, what were the major reasons; if not,
can someone give me pointers to recent descriptions of applications?
Thanks,
Bill Harris
billh%hplsla@hplabs.hp.com
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