Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2767

Full Length Research Paper

A self organizing map (SOM) guided rule based system for freshwater tropical algal analysis and prediction

M. Sorayya1*, S. Aishah1, B. Mohd. Sapiyan2 and S. A. Sharifah Mumtazah3
1Institute of Biological Sciences (ISB), University Malaya, Kuala Lumpur, Malaysia. 2Faculty of Science Computer and Information Technology, University Malaya, Kuala Lumpur, Malaysia. 3Faculty of Engineering, Universiti Putra Malaysia (UPM), Serdang, Malaysia.
Email: [email protected]

  •  Accepted: 23 May 2011
  •  Published: 30 October 2011

Abstract

This paper describes the feasibility study of applying a hybrid combination of Kohonen self organizing feature maps (SOM) and a rule based system in predicting the biomass of selected algae division (Chlorophyta) at tropical Putrajaya Lake (Malaysia). The system was trained and tested on an over five years of limnological time-series data sampled from Putrajaya Lake. Results from trained SOM were used to extract rules of relationships between input variables and the Chlorophyta biomass which was used to construct a rule based system. Selected input variables were water temperature, Secchi depth and nitrate nitrogen (NO3-N). The rules extracted conformed to findings as postulated in literatures. The overall rule based system yielded an accuracy of 73%.

 

Key words: Kohonen self organizing feature maps, prediction, rule based system, chlorophyta.