Ventana software support forum

The system dynamics methods are suitable in general. But changing paths in the middle of a project might be more catastrophic than your current situation. You should re-think where you are: Your experienced in UML, your client is not communicating well with your programmers. Communication difficulti...

Kim, I hope we can more clearly understand the semantic difficulties around using the work "validate". From Websters Dictionary, there are two opportunities: 1) To mark with an indication of official sanction. 2) To establish the soundness of Thus, a group of people can agree to the use of...

Finn, You pointed out some of the considerable pitfalls of using a systematic method to solve generic problems. But there is an up side. It is usually beneficial for us to characterize the systems we work in/with. The selling example is great. We should be aware of the generic components to consider...

Lets make sure we are talking about the same thing. Below, I see: "Yaman, can you find a single name that works for either discrete-time or continuous-time?" But I believe the discussion was more along the lines of discrete-event systems and continuous-process systems. If we pursue "d...

8 JEAN-JACQUES, I thought it would be fun to address two points of your posting: 1) "One of the problem is to find a sufficiently small period ot time, to order the arrival of events. The order of arrival is always important in discrete simulation. This is generally not a problem unless the dis...

Roland, Texas Instruments worked on such a project through the 90s and then sold everything they had developed to Accenture (www.accenture.com/). The fundamental problem TI had in this endeavor was to define the goal - the objective function for the optimization. The engineering team had concerns fo...

David, System Dynamics may help you study a system with dynamics, that is a system with stocks and flows, but your condensers normal mode of operation is more than likely in steady state. As such, all relationships can be dealt with algebraically. While SD tools are great at managing complex relatio...

Joel gave a very good summary. For free, try a google search on design of experiment: http://www.google.com/search?as_q=&num=10&hl=en&ie=UTF-8&oe=UTF-8&btnG=Googl e+Search&as_epq=Design+of+experiment&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=& as_qdr=all&a...

There probably is no business looking for SD. Business have problems/opportunities they need solutions to. We can not expect to walk into a business a say "See how good this company did by addressing its problems with SD!" The first thing to do is get to know your potential client; learn t...

J.J. Laublé From: "ALLOCAR SRASBOURG" It seems that this task may take some introspection. What I read from you was that you would not approach them with the topic of SD because you know how they would respond. If you have experienced this behavior from them in the past, it may be due to y...

I have to thank John Sterman for awakening me to the ghosts in my machines. As such, I need a more objective concept of learning. It would be instructive to address an agent subjected to a process which results in learning a behavior. So there is an agent which is to learn a process, a training proc...

I like Richard Hammings commentary on modeling which points out the importance is not in the numbers the model produces but the insight the numbers bring. Our goals are diverse - a good thing. If some wish to design models that learn, we have to opportunity to study learning. If one of our goals to ...

Sorry for the interruption, but I am so focused on this topic that I couldnt let this opportunity lie. Specifically, "if a model that learns/changes could lose its problem focus". If we look at the hill climbing problem, we could find that a given hill climbing routine assigned to climb an...

Marsha, Thank you for the energy and thoughtfulness you put into the message. It has given me a lot to consider and some to comment on. First I would like to ask you not to be too discourage about your finding of the ridged view “we do x when y occurs”. I have run into this for decades. It is not yo...

I like the approach but I am a little lost in the detail of: * the desired state "s" is a changing goal. It describes a learned * response. Is it the intent to describe this optimization process as a learning process? So this should be valid when the end point is fixed (a given state) or c...

My favorite approach comes from control systems engineering. It is automatic tuning. An example could be the controller on an elevator. The objective is to locate the correct position to stop the elevator at a floor with an accuracy of 2mm and to do so quickly but not jerky and dont overshoot the en...

I have really enjoyed this topic. A little research shows that the Defense Modeling and Simulation Office (https://www.dmso.mil/) has supported the development of an integrating concept labeled High Level Architecture (HLA). More info can be found at: http://www.mitre.org and http://www.omg.org/. Th...

We have seen some very informative links to important issues in the health industry. I would like to add my two meager comments: 1) Consider what your supporters are interested in. 2) Consider what you are interested in. 3) It may not be necessary (or possible) to exercise pertinent models with the ...

The write up by Eric Wolstenholme was very exciting. Hearing politicians address a rational basis at least promising. What would be additionally informative is hearing of the process which was used to develop the model and present the findings. Was there bipartisan review? Data validation? Ray From:...

Yes, as Jim Hines points out, this is extremely valuable. It would be appropriate to set up a list server to address this issue so as not to clog the normal SD channel. There are many examples of specification development and recommended practices development on the web. It would be appropriate to h...

I just had to add one more that I have noticed. The number of TV
advertisements by lawyers promoting civil action for LTDs. This may have a
correlation with a lack of other jobs to do.

Ray
From: "Ray on EV1" <rtjoseph@ev1.net>

The latest issue of The Industrial Physicist had an article on how to apply
the predator-prey model to sales. One of the three parameters of the model
can be viewed as attractiveness.

Ray
From: "Ray on EV1" <rtjoseph@ev1.net>

Sheila, You will probably get URLs from numerous others so I will focus on just one issue. It is usually best to define the problem before generating a solution. Although it would be possible and a fun (and impressive) mountain to climb, having different machines for different aspects of a business ...

Timothy, It would be advantageous to differential between marketing and sales. Where a marketing strategy can be carried out on the web or at retail (and numerous other forms not addressed), phone is typical a sales campaign form. This is also true if the web action is mass emails. Telemarketing hou...

Timothy, Yes. I have often provided the margin calculations differentiating sales channels. Every industry I have worked with does this on a continuing basis. But, they always approach it algebraically. Since youve brought it to this channel, I am guessing that you are interested in the dynamics. Th...