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Ecolego is a powerful and flexible software tool for creating dynamic models and performing deterministic or probabilistic simulations. Ecolego can be used for conducting risk assessments of complex dynamic systems evolving over time with any number of species. Ecolego has specialised databases and other add-ons designed for the field of radiological risk assessment.
The graphical user interface helps the user to define and manage building blocks, parameters, species and simulation settings. Ecolego also helps to create reports, to plot simulation results, to perform probabilistic simulations and sensitivity analysis.
Easy management of blocks, parameters, materials and other settings.
Hierarchical containers facilitates construction and documentation of large and complex models.
Projects are easily managed using the project browser, which displays a hierarchical view of blocks, parameters, contaminants and other objects. Multiple projects can be open simultaneously
Copy-paste of parameters, containers, blocks and materials within and between projects.
Tool tips present information about selected objects, such as equations, units, “used by” or “uses” relationships.
Hyperlinks allow the user to jump to different parts of the model.
Creation of models using interaction matrices
Sub-system modules can be created to create re-usable components
Documentation of models using images, hyperlinks, categories, units and comments
Parameters and blocks can be created on-the-fly while equations are written
Listings of all undefined objects or illegal values
Generates full reports that can be saved in many different formats including the Adobe PDF format
Automatic handling of nuclide decay and ingrowth (requires Radionuclide Toolbox
Possibility to call user-written functions in Java or Matlab during simulation.
Powerful numerical solvers for complex and dynamic systems. Fixed and variable step size solvers of ordinary differential equations for stiff problems.
Support for probabilistic simulations using Monte Carlo or Latin Hypercube sampling.
Advanced editor for probability density functions.
Parameter sensitivity analysis. Pearson, Spearman, EASI correlation coefficients and regression coefficients. Several other methods available with the Sensitivity Analysis Toolbox (EIKOS)
Many different types of result charts and tables are available for simulation outputs.
Subversion support for modelling collaboration and version handling
Radionuclide database. Radionuclide Toolbox
External parameter database connection for sharing and management of quality assured project parameters. Parameter Database Toolbox
Sub-system module library
Export and import of parameter values and results to/from Microsoft Excel.
Ecolego Player is a free software for making assements using models created with Ecolego. This way you can distribute your Ecolego models to customers and colleagues.
Ecolego Player features the same functionality as Ecolego, with the exception that the model structure can not be changed.
ODE toolbox feature powerful numerical solvers of ordinary differential equations. Both variable and fixed step size solvers are available, as well as solvers for stiff systems.
Set up system of ordinary differential equations using graphical blocks (
Compartment|compartments and Transfer|transfers )
Supports both linear and non-linear transfers
Variable step size solvers
Fixed step size solvers * Runge-Kutta 1-5
The Eikos Sensitivy Analysis Toolbox supports “state of the art” sensitivity analysis methods (local as well as global). Sensitivity analysis (SA) is used to assess the influence of model parameters on model predictions.
The Eikos Sensitivity toolbox is an optional fully integrated module for Ecolego and is thus most suitable for using with Ecolego models, although external models are also supported by exporting/importing samples of model inputs and/or model predictions.
Correlations between parameters may be induced by rank order correlation (method of Iman and Conover). The supported sampling techniques are: Monte carlo, Latin Hypercube and Quasi-random LPt. The SA methods included are:
Eikos provides a Graphical User Interface (GUI) which let you:
It is also possible to perform sensitivity analysis on groups of parameters (using extensions of the Sobol or EFAST methods). In this way the influence of each of the selected parameters as well as any combination of them is accounted for when computing the sensitivity indices on a given output.
The radionuclide toolbox features a database containing all nuclide isotopes and their decay constants and decay energies. It also contains the parent-daughter relationships between a radionuclide and its decay products.
When the radionuclide toolbox is used together with the ODE toolbox, Ecolego will automatically calculate ingrowth and decay for each state in the model.
The parameter database is a free product which can be set up to centralize and quality assure parameter data. Storing parameters in the parameter database assures that data is traceable and transparent.
Ecolego and its sub-products are platform independent and run on 32/64 bit Win2000/XP/Vista/7, MacOSX, Linux and Unix.
ECOLEGO - A toolbox for radioecological risk assessment Proceedings of the International Conference on the Protection from the Effects of Ionizing Radiation, IAEA-CN-109/80. Stockholm: International Atomic Energy Agency. 229 - 232.
Further AMBER and Ecolego Intercomparisons SKI Report 2004:05 SSI Report 2004:01
AMBER and Ecolego Intercomparisons using Calculations from SR 97 SKI Report 2003:28, SSI report 2003:11
Ekström P-A, 2005. Eikos. A Simulation Toolbox for Sensitivity Analysis. M.Sc. thesis, Uppsala University, UPTEC Report IT 05 015.
Poster (Proceedings of The 2nd International Conference on Radioactivity in the Environment, ISBN 82-90362-21-8. 2-6 October 2005 in Nice, France. 361-364.)
Ekström P-A, Broed R, 2006. Sensitivity Analysis Methods and a Biosphere Test Case Implemented in Eikos. Posiva Working Report 2006-31, 84 pp.