Spring 2007

Newsletter Home | Contact | GRC



Featured Application


Modeler's Corner


GoldSim News


What's Cooking


Tips and Tricks


Knowledge Base


Model Library


Interesting Links



Working with Vectors and Matrices: In many models the use of vectors and matrices can greatly simplify model construction.   GoldSim includes many tools to help you work with vector and matrix type elements.  All of these tools can be accessed by right-clicking in any input field, selecting Function in the context menu, and then selecting Array Operators.  Particularly useful are the GetRow, GetColumn and GetItem functions added in version 9.50.   These functions allow you to dynamically specify row and column indices using links to other GoldSim elements.




The GoldSim Knowledge Base contains articles addressing frequently asked questions, workarounds for known problems, and advice on applying GoldSim. The Knowledge Base is available from within the GoldSim Resource Center (GRC).

We encourage you to visit the Knowledge Base, as even expert users are likely to find useful information there.



The GoldSim Model Library allows GoldSim users to build on the experience and knowledge of others by sharing models. The Library is available from within the GoldSim Resource Center (GRC).

New models that have recently been added include:

Model 62: Using a Status Element to Turn Processes On and Off. This model illustrates how a Status element can be used to turn processes on and off.  In this particular example, a pump is turned on and off based on the water level in a pond.

Model 63: Comparing Marketing Program Alternatives. This example compares the effectiveness of three different marketing approaches.

Model 64: Computing and Recording the Difference Between Initial and Final Values. This model reads in a long historic record of daily rainfall (in this case, over 100 years), and uses this data to cycle through a number of realizations of a shorter period (in this case, 10 years).

Model 65: Sampling Historic Time Series Data to Simulate Daily Rainfall. This model reads in a long historic record of daily rainfall (in this case, over 100 years), and uses this data to cycle through a number of realizations of a shorter period (in this case, 10 years).

If you have a model that you think would be worth posting to the library, please send it, along with a description, to support@goldsim.com.



Simulationists' Code of Ethics: A proposed code of professional ethics for modelers that addresses such issues as personal development, professional competence, trustworthiness, property rights and due credit.

A Skeptics Guide to Computer Models: A little dated, but the lessons still apply. Models are based upon assumptions, and those assumptions are often unstated and unchallenged.




Spring 2007 GoldSim Newsletter

GoldSim's mission is to help you make better decisions in an uncertain world by providing state-of-the-art software, training and expert consulting. Our GoldSim simulation software package provides the power, flexibility, and usability to efficiently simulate and understand the future behavior of complex systems in business, engineering, and science.

Since this newsletter is for you, we encourage you to share your comments and contributions with us. Please email your thoughts to support@goldsim.com.


GoldSim Conference

Save the Date: 2007 GoldSim User Conference and Training Seminar in San Francisco, October 23-26

We are pleased to announce that the 2007 GoldSim User Conference will be held on Thursday and Friday, October 25-26 in San Francisco, California.  Just prior to the conference, we will offer two concurrent training seminars: Basic GoldSim Modeling on October 23-24, and Advanced GoldSim Modeling on October 24 (with topics chosen based on registrant's suggestions). The conference is a terrific opportunity to increase your knowledge of GoldSim, ask questions directly to GoldSim developers, and network with other GoldSim users.

The agenda for the conference includes sessions to improve your GoldSim skills, presentation of a number of papers from our most experienced and knowledgeable users, a poster session so you can see how other users apply GoldSim, and a model contest so you can show off your GoldSim skills. We will also be featuring a group modeling exercise this year that promises to be both fun and highly educational. As always, we have scheduled several social events in the evenings so that you can enjoy the sights of one of the world's most vibrant cities while networking with fellow GoldSim users.

Conference details (including agenda, venue, costs, and a call for papers), along with a registration form will be available within the next week on our website.  We will send out a short note to everyone on the Newsletter list when this information is available.


Featured GoldSim Application

Addressing Global Warming: Applying GoldSim to C02 Sequestration

Mounting evidence of global problems associated with excess atmospheric CO2 requires a solution that can be implemented quickly, safely, and economically.  Given these constraints, researchers worldwide have concluded that geologic sequestration is the best available option.  Los Alamos National Laboratory (LANL) has developed a system-level model for geologic sequestration that tracks the fate of CO2 and is designed to include all associated risks.  The system-level CO2 sequestration model, called CO2-PENS (Predicting Engineered Natural Systems) uses GoldSim as an upper level platform. This article briefly discusses LANL's modeling framework.



GoldSim News

Version 9.6 of GoldSim Released

Version 9.60 of GoldSim was recently released. This new version has a number of new features, including:

  • The Material Time Series and Information Time Series elements have been retired, replaced by a single new Time Series element that is simpler and more versatile.  Existing models with Material or Information Time Series elements will be automatically converted.  Among other capabilities, the new Time Series element is capable of recording a time series that can be ‘played back’ later.

  • Options have been added to the Simulation Settings dialog allowing users to use calendar-based timesteps (monthly, quarterly, or annual) as opposed to constant timesteps.

  • Results inside of SubModels can now be saved and viewed.

  • The user interface and functionality for External elements and External Pathways (in the CT Module) has been enhanced. Among other improvements, external functions can now input and output Time Series.

In addition to these major changes, a large number of additional enhancements were also made to GoldSim to improve its overall performance and usability. A more complete list of changes can be found in the Release Notes.

All current members of the GoldSim Subscription Program can download Version 9.6 right now from the GoldSim Resource Center (GRC).


Free GoldSim Reliability Elements

Did you know that all GoldSim versions provide access to the Reliability Learning Edition, allowing you to use up to ten Reliability elements? The Reliability Module (RL) allows you to probabilistically simulate and analyze the reliability and performance of complex engineered systems over time. For example, with RL, you can predict the reliability of a new mine conveyor system, evaluate the safety of a proposed space station, or determine the fault tolerance of a new network topology. You can access RL elements simply by creating a new model. For further examples, you can download RL models from the GoldSim Resource Center.


GoldSim Reliability Webinar

GoldSim invites you to an Introduction to the Reliability Module webinar on April 26th, 2007 at 8:30 AM PST (-8 hours GMT). Andrew Burns will discuss the basic features of the Reliability elements and show how they can be used to simplify modeling of system states in your GoldSim models. This webinar is a great way to see how you might take advantage of the Reliability Learning Edition (included with GoldSim Pro) in your own models. Click here to send an email to Tim Schmitt to receive an invitation. Depending upon the response, a second time may be added to better accommodate attendees in Asia and Australia. Send us a note and we'll let you know!

GoldSim and Sandia Sign Partnering Agreement

GoldSim Technology Group recently signed a four-year Cooperative Research and Development Agreement (CRADA) with Sandia National Laboratories (Sandia).  The objective of the CRADA is to help create the next generation software package for evaluating complex engineering problems. This collaborative effort will provide an advanced computing solution that directly supports Sandia’s mission as the Lead Laboratory for the United States Department of Energy's Yucca Mountain Project (the evaluation of a potential high-level radioactive waste repository at Yucca Mountain, Nevada). In addition to supporting Sandia's ongoing efforts at Yucca Mountain, the collaboration may also have direct benefits for a wide variety of other applications of interest to both Sandia and GoldSim, including simulation of water resources problems, and engineering reliability analysis for energy, space and defense systems.


Modeler's Corner

Running Models Using Calendar-Based Timesteps

GoldSim allows you to run models based on either elapsed time or calendar date/time.  Running calendar date/time models, however, can be a bit tricky, since calendar-based models are complicated due to the variability of the basic time units (e.g., the number of days in a month changes for each month). This short article discusses a new GoldSim feature that makes it easy to create calendar-based, non-constant (e.g., monthly, quarterly) timesteps.



What's Cooking

Beyond Version 9.6

We are already working on a number of items for our next release (targeted for late 2007). One of our major efforts currently revolves around Dashboard Redesign.

An increasing number of users rely on models with Dashboards (control panels that allows others to easily edit and run your models). In response to this, we are currently implementing a redesign of our Dashboard Module to incorporate user requests and add a number of powerful new features.

As always, we encourage user requests and suggestions. If you have specific feedback, please contact us at support@goldsim.com.


© 2007 GoldSim Technology Group LLC. You can unsubscribe or subscribe to this Newsletter at our website.