<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"/>  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> The next LispDen meeting will be at 6:00 PM on Wednesday, 16 November 2005 at the Gordon Biersch Restaurant and Brew Pub at Flatirons Mall in <st1:place w:st="on"><st1:City w:st="on">Broomfield</st1:City>, <st1:State w:st="on">CO</st1:State></st1:place>.  I will present the PLT Scheme Simulation Collection (see the synopsis below).  This builds on the PLT Scheme Science Collection that was described at a previous LispDen meeting.  The presentation will be followed by a workshop, so bring your laptop if you want to play with the simulation package.  I have attached a pdf of the presentation slides.<o:p></o:p> <o:p> </o:p> I am also in the process of moving the code development to the Schematics project at SourceForge.  Thanks to Noel Welsh and the other Schematics folks for setting that up for me – and my apologies for taking so long to actually do it.<o:p></o:p> <o:p> </o:p> Here is a synopsis of the presentation.<o:p></o:p> <o:p> </o:p> I am attempting to recreate - and extend - in PLT Scheme the knowledge-based simulation environment I used to have in Symbolics Common Lisp. It consists of three PLT Scheme collections: Science Collection, Simulation Collection, and Inference Collection. The PLT Scheme Science Collection is a port of portions of the GNU Scientific Library (GSL) that provides a foundation for implementing the other collections, as well as providing data analysis functions. The PLT Scheme Science Collection has been released via PLaneT. Version 2.0, which includes ordinary differential equations, will soon be released. <o:p></o:p> The PLT Scheme Simulation Collection provides a simulation engine for combined discrete-event (based on a process interaction model) and continuous simulation models. The PLT Scheme Simulation Collection will soon be released to PLaneT. The PLT Scheme Inferencing Collection provides a rule-based inference engine.<o:p></o:p> <o:p> </o:p> In this talk, I will present the PLT Scheme Simulation Collection.  I will start with a simplified discrete-event simulation engine (less than three pages of documented Scheme code) to show how to build a continuation-based simulation engine.  Examples and demonstrations will be used throughout the presentation.<o:p></o:p> <o:p> </o:p> Doug Williams<o:p></o:p> <o:p> </o:p> </div> </body> </html>