GoldSim Spring 2010 Newsletter

	Spring 2010
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	GoldSim News
	Featured Application
	Modeler's Corner
	What’s Cooking
	Tips and Tricks
	Model Library

Reservoir’s state variable “is_Full”: Since GoldSim 10.1 the Reservoir element has a new state variable output called “is_Full” that reports True if the Reservoir is at its upper bound. This output enables you to define inputs to the Reservoir in terms of the condition of the Reservoir itself without creating recursive loops.

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 84: Water Balance Model for a Pervious Catchment: This GoldSim model does the calculations of the pervious catchment water balance module of the Hydrologic Simulation Program Fortran (HSPF-PERLND PWATER module). For more details, read the featured GoldSim application article on the right.

Model 85: A Stochastic Weather Generator: The WGEN weather generator model has been rewritten in a GoldSim model. The GoldSim model produces daily time series of minimum and maximum temperature, precipitation, and solar radiation based on annual and monthly statistics.

Model 3: Discrete Version of an Acute Infection Model: An acute infection model has been available in the Model Library and in the Player Examples installed with GoldSim application. However, the problem was originally modeled continuously which worked only when the population was sufficiently large. We have added a discrete version of this model that provides a better solution for low population values.

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.

Spring 2010 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 News

GoldSim 10.11 Service Pack 1 Released

GoldSim Version 10.11 SP1 (Service Pack 1) was released on April 2, 2010. Version 10.11 SP1 is a minor upgrade which corrects some minor problems found in Version 10.11. We encourage all users who have installed GoldSim 10.1 or 10.11 to install this upgrade.

All current members of the GoldSim Subscription Program can download the GoldSim Version 10.11 SP1 installation file from the GoldSim Resource Center (GRC). Both a full installation and a small patch file (that updates 10.11) are available.

GoldSim Training Sessions in the USA and Australia

Seattle: July 21-22, 2010

A 2-day GoldSim training course will be held at our offices in Issaquah, Washington (just outside of Seattle) on July 21 and 22, 2010.

This two-day workshop will provide a general introduction to the use of GoldSim. It will be of value to new users, and will also serve as an excellent refresher course (and introduction to new features) for existing users.

The cost is US$1000 per attendee and includes continental breakfast and lunch both days. Free 60-day temporary licenses will also be provided to any attendees who require a license.

Further details and a registration form can be found here.

Brisbane: August 2-4, 2010

A 3-day GoldSim training course will be held in Brisbane, Australia from August 2 to 4, 2010.

The first two days of the workshop will focus on GoldSim basics, with the third (optional) day focusing on the use of the Contaminant Transport module.

This 3-day workshop will provide a general introduction to the use of GoldSim. It will be of value to new users, and will also serve as an excellent refresher course (and introduction to new features) for existing users.

The cost is AU$1300 per attendee for the 3-day course, and AU$900 for the 2-day course. Continental breakfast and lunch are included all three days. Free 60-day temporary licenses will also be provided to any attendees who require a license.

Further details and a registration form can be found here.

Featured GoldSim Application

Hydrologic Simulation Program – Fortran (HSPF) Water Balance Model in GoldSim

The Hydrologic Simulation Program - Fortran (HSPF) has become one of the most widely used conceptual rainfall-runoff models since it was developed as the Stanford Watershed Model in the 1960s. Though the model has had many applications, it has a couple of critical weaknesses. It is very difficult to use by non-experts, and it does not support Monte Carlo simulations to account for uncertainty in its input parameters. To develop a more user-friendly runoff model supporting Monte Carlo simulation, the water balance module of HSPF was rewritten in GoldSim.

Modeler’s Corner

Shifting Time Series Data - Using Historic Data in Predictive Models

In many predictive models, there is a need to shift historic data so it can be applied to simulations of the future. GoldSim 10.1 and later versions include Time Shifting options that enable you to easily time-shift Time Series data in an appropriate and consistent manner. This Modeler’s Corner will walk you through this new feature and discuss the various time-shifting options.

What's Cooking

Beyond GoldSim Version 10.11

Here are some of the things we are currently working on for the next version:

A Script element that allows you to create complex procedural code within GoldSim. In addition to supporting all of the functions and features of Expressions, the Script element supports nested if, then, else statements, and various looping options (e.g., For, Do, While).

Scenario management features to assist in the definition and display of alternative scenarios in a model.