Ventana software support forum

Ed Gallaher schrieb: > Can anyone provide examples that contradict Jays assertion? I certainly cant. Ive gone through this over and over again, and like you, Ed, at rock bottom I always come up with an accumulation. So Im now a fully paid-up convinced disciple ... regarding _rates_. However with res...

Tom Fiddaman schrieb: > Ive long suspected that Jay is right and that inductors actually are > fundamentally integrators, but with a short time constant (speed of light / > size of device?). Inductors rely for their operation on Faradays Law: |InducedVoltage|=|d(LinkedFlux)/dt|, which essentially tr...

John Eggers schrieb: > In an attempt to have groups experience "systems thinking," we are planning > to have approx five groups of six individuals form a circle, and each group > will be given a number of "Koosh" balls. They will need to devise a plan to > circulate the balls wit...

Wolfgang Schade schrieb: > ... the ASTRA model ... covers whole Western Europe > divided into 4 regions ... It consists of 4 modules: I find this really interesting. If Ive understood you correctly, youve used two orthogonal dimensions in this model: national (regional) structure, and economic struc...

Jay Forrester wrote: > Mathematicians have had some difficulty defining a derivative, and > there is a reason. There is no such thing. Nowhere in nature or > human affairs is a true derivative to be found. Nature only > integrates or accumulates. No instrument can instantaneously > measure a rate; a...

Hi, I am currently putting together a "book" of system dynamics simulations for prospective students of bioinformatics, and I want to include something on bioethics. Unfortunately I dont know a lot about bioethics, and my hope is that someone of you might be able to suggest a relevant bioe...

I would be interested in general to hear from people with experience in running the Beer Game the kinds of issues which typically arise, and the kinds of points made in the debriefing. Niall Palfreyman. n:Palfreyman;Niall tel;work:+49-8161-714814 x-mozilla-html:FALSE org:Weihenstephan University of ...

Andy Ford schrieb: > We managed to keep the sectors integrated in a > manner that led to insights, not confusion... I have long thought that object-oriented modelling and system dynamics had much to learn from each other. In particular, several stocks in a model are often attributes of a single &quo...

John Gunkler schrieb: > ... the people who have been working for two decades on what > was initially called "artificial intelligence" (especially, expert > knowledge capture) have developed protocols for interviewing "expert" > subjects... Hm. An interesting juxtaposition: SD and...

John Gunkler schrieb: > I absolutely love your idea of asking experienced modelers to create > models from the same written description, then asking them to describe > their thinking processes. (There are, I believe, some formal ways of > asking them to describe their thinking.) I must have missed t...

"Raymond T. Joseph" schrieb: > It is fun to see others obsessed with systems! <grin> Isnt it just? Im finding it incredibly addictive myself. > Could you please clarify (by example?) your intent of nonlocality? > I would also like to learn more about the idea of such a concept being > asso...

I find it hard to express my feelings about this thread. Probably the simplest is that I just feel cross. Ive been an excited bystander to this list for about 3 years now, and for a time I joined the SD Society. Unfortunately I found the content of the journal too management-oriented to be of much i...

"Weaver, Elise A" schrieb: > Number of Altruists = 100 - Number of Selfists? This doesnt > seem to capture the depth of what you are after, however. Hi Elise, No, thats right. Im after a _mutual_ link in which it is equally the case that Number of Selfists = 100 - Number of Altruists As I ...

Michael Bean: > Usually, I believe that its a bad idea to run the beer game as a computer > simulation... > Its almost always a bad idea to change the medium for any game or simulation. Yes, Im concerned about that. However this really will be a "hands on" game, with the students making th...

Alan Graham schrieb: > My first objection, then, is to the apparent process of coming up with the > "simplest solution". The discussion gives the strong impression that a > legitimate process for representing constraints is to arbitrarily anoint all > the variables involved as state variab...

John Wolfenden schrieb: > Did you observe any behaviour that could be attributable to different > learning/engagement styles? Oh gosh, I hadnt really thought about that. I tend to just generally pay attention to the V and K sides because thats what most people seem to attend to most consciously, and...

John Sterman schrieb: > 1. we always tell people the game will run 50 weeks... Right, thats what Ill do in future. > 2. what were the incentives? we usually run the game with inventory > costs of $0.50/case/week and backlog costs of $1.00/case/week. We worked with 1Euro/crate.week for inventory and ...

Hi, Many thanks for the many suggestions and advice you all sent. Several people sent cautions about running simulations, since they may miss the "hands on" experience, so at the moment Im planning the following: Ive built a 5-stage model in Stella, based on the 1-stage model provided by S...

Im fascinated by the answers that have been coming in to my question. Theyre showing me that the idea I have niggling at the back of my mind is very different from the main thrust of SD thinking. Whether the idea is actually _useful_ is, of course, another issue again :-). I will try once more now t...

Brian J Barry wrote: > Set up three stocks, Pressure, Volume and Temperature. Stipulate > appropriate initial values. Each stock should have a single flow > controlling up or down exponential adjustment. Formula for this > flow - which, for Pressure, might be called Adjusting Pressure > would be: > ...

Hi, this is a rather urgent question. Im planning on running the Beer Game with a group of about 30-35 students. However I have only ONE Beer Game board, and time is also rather short for the session. So I thought Id cut out a lot of the time-consuming mechanics of the game by running it as a comput...

Hi, I finally ran the computer-simulated Beer Game with a group of students yesterday, and came out with a whole load of surprises and learnings. Since several people on the list asked me to report on the event, I thought Id also take advantage of the opportunity to ask for advice on a couple of iss...

Ive mentioned a couple of times what I see as a problem of representing constraints in SD. I referred on those occasions to the issue of quantum coupling between particles, which doesnt match the strictly causal standpoint of SD. Unfortunately I could never on the spur of the moment think of a more ...

George Richardson schrieb: > ... I cant see what this teaches me about complex systems... Well, I must say, Im gobsmacked at the deafening silence in answer to Georges question. My first reaction was: "What a silly question - doesnt the man know _anything_ about complexity?" Then I started...

Niall Palfreyman schrieb: > ... otherwise I see no problem in using both tools to complement each other. Ivan has pointed out to me that Im missing the point of his question. I said that CAS and SD complement each other, without actually thinking about _how_ exactly they do so. Which of course is pr...