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Volume: 9, Issue: 9, Thu Jul  6 14:04:24 EDT 1989

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| TODAY'S TOPICS |
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(1) FORTRAN Simulation Routines
(2) Scheduling/Unscheduling
(3) Information Systems Newsgroup Formation
(4) Expanding the Simulation Forum

* Moderator: Paul Fishwick, Univ. of Florida
* Send topical mail to: simulation@uflorida.cis.ufl.edu
* 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.



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Date: Mon, 3 Jul 89 14:03:48 EDT
From: mroth@BLACKBIRD.AFIT.AF.MIL (Mark A. Roth)
To: simulation@bikini.cis.ufl.edu
Subject: FORTRAN simulation routines


Does anyone have knowledge or access to a set of FORTRAN subroutines
which implements a basic simulation engine (time keeping and event
scheduling, random variate generation, etc.)?  I was reading about
some PASCAL implemtations in the Winter 87 Simulation Conference and
thought surely someone had done it in FORTRAN.

Mark Roth
AFIT/ENG
WPAFB, OH 45433
mroth@afit.af.mil



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To: Paul Fishwick <fishwick@fish.cis.ufl.edu>
Subject: Re: SIMULATION DIGEST V9 N8 
In-Reply-To: Your message of Sat, 01 Jul 89 13:24:15 D.
Date: Tue, 04 Jul 89 14:45:40 PDT
From: Sanjai Narain <narain%pluto@rand.org>


 Reply to Steve Glicker
 ----------------------

My motivation in asking the question about scheduling/unscheduling was
that I would like to reason about programs written using the
discrete-event technique.  As these concepts are associated with it,
whether or not they form part of the "main model", it is essential to know
what is their semantics, i.e. deeper purpose.

For example, a natural question is whether it is possible to schedule only
those events which would never be unscheduled?  If not, why not?

As I mentioned previously, we have developed a new formalism called DMOD
in which concepts of scheduling/unscheduling and event queues are shown to
be logically dispensable.  However, it seems to successfully capture the
intuitions captured by the discrete-event technique.  Furthermore, it can
represent states which change gradually over time, such as position.
State changes need not be discrete.

In the light of DMOD we believe that scheduling and unscheduling are
methods of enforcing the logic of abstract causality rules which refer to
the future of causing events. If this is so, these more declarative
rules can directly form the simulation program (as is the case in DMOD).

Regards.

Sanjai Narain



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Organisation: University of Technology, Delft  The Netherlands.
To: comp-simulation%hp4nl@uunet.UU.NET
Path: dutrun!winffww
From: dutrun!winffww@uunet.UU.NET (Folkert W. Wierda)
Newsgroups: news.groups,comp.simulation,comp.databases,comp.cog-eng
Subject: *** CALL FOR DISCUSSION: creation of COMP.INFORMATIONSYSTEMS ***
Date: 6 Jul 89 10:16:03 GMT
Followup-To: news.groups
Organization: Delft University of Technology, The Netherlands


*****************************************************
ALL REACTIONS ONLY TO NEWS.GROUPS!!!!!
*****************************************************


CALL FOR DISCUSSION ON CREATING COMP.INFORMATIONSYSTEMS

The field of INFORMATION SYSTEMS at the moment does not
have it's own forum for discussion. Not only is it
missing on USENET, also on other networks an area for
discussions and exchange on topics like design of
information systems, decision support systems,
organizational impact of information systems,
support tools for designing information systems, research
methods in information systems, information planning,
etc. is lacking.

After consulting Henk Sol, Ralph Sprague and Gordon Davis
and several other researchers in the field of IS we have 
come to the conclusion that we should try to create such a
discussion area. In our view this discussion area should 
be COMP.INFORMATIONSYSTEMS. It should be part of the COMP 
tree, because we are talking about computerized information 
systems. 

In our view the area should be MODERATED, in order to be
able to filter out the postings that have nothing to do
with information systems. Moderation means just filtering,
appropriate postings will appear unchanged. Moderation 
will be performed by Alexander Verbraeck and 
Folkert W. Wierda at Delft University of Technology, 
Department of Information Systems.

This discussion on creating COMP.INFORMATIONSYSTEMS
starts at July 6, and will continue till August 5. At
that same day a call for votes will be posted, that
continues till September 5. Please remember that all
contributions to this discussion should be posted to
news.groups.

For any further questions and suggestions about the
proposed newsgroup it is also possible to contact us 
by E-mail.

 ------------------------------------------------------
Alexander Verbraeck       winfave@hdetud1.bitnet
                          winfave@dutrun.uucp
Folkert W. Wierda         winffww@hdetud1.bitnet
                          winffww@dutrun.uucp
Delft University of Technology
Department of Information Systems
P.O.Box 356   2600 AJ Delft    The Netherlands
 ------------------------------------------------------



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Date: Thu, 6 Jul 89 13:54:35 -0400
From: Paul Fishwick <fishwick@fish.cis.ufl.edu>
To: simulation@ufl.edu
Subject: volunteers wanted


Are there any volunteers out there who would like to do the following
for the digest?

  (1) Condense news stories connected with simulation. Especially from
      magazines such as Discover, Sci. American, Science, NewsWeek,
      Time, etc. 

  (2) Provide book reviews on simulation related topics.

  (3) A quote from someone's book that has lasting significance.

  (4) A list of Ph.D. dissertations and M.S. theses connected with
      simulation.

  (5) A list of bibliography citations (preferably in the form used
      by LATEX and Scribe) for a special subtopic.

  (6) A review on a simulation software package.

I'm sure that I have missed out a lot! If you have any ideas, please
send them in! Electronic news groups have the potential to become
on-line publications in their own right. Pictures can be included
eventually when this medium becomes more tractable. In the mean time,
we can copy the way that current magazines and journals do things
(with departments and sections...).

-paul

+------------------------------------------------------------------------+
| Prof. Paul A. Fishwick.... INTERNET: fishwick@bikini.cis.ufl.edu       |
| Dept. of Computer Science. UUCP: gatech!uflorida!fishwick              |
| Univ. of Florida.......... PHONE: (904)-335-8036                       |
| Bldg. CSE, Room 301....... FAX is available                            |
| Gainesville, FL 32611.....                                             |
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END OF SIMULATION DIGEST
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