Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!simulation From: simulation@uflorida.cis.ufl.edu (Moderator: Paul Fishwick) Newsgroups: comp.simulation Subject: SIMULATION DIGEST V10 N5 Message-ID: <20767@uflorida.cis.ufl.EDU> Date: 22 Aug 89 13:55:14 GMT Sender: fishwick@uflorida.cis.ufl.EDU Reply-To: simulation@uflorida.cis.ufl.edu Lines: 155 Approved: fishwick@uflorida.cis.ufl.edu Volume: 10, Issue: 5, Tue Aug 22 09:55:05 EDT 1989 +----------------+ | TODAY'S TOPICS | +----------------+ (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 post to comp.simulation via USENET * Archives available via FTP to bikini.cis.ufl.edu, login as 'anonymous', use your last name as the password, change directory to pub/simdigest. * Simulation Tools available by doing above and changing the directory to pub/simdigest/tools. ----------------------------------------------------------------------------- Return-Path: 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 ------------------------------ 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. ------------------------------ From: Bill Harris 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 ------------------------------ END OF SIMULATION DIGEST ************************