[IEEE 2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - Chonburi, Thailand (2009.05.6-2009.05.9)] 2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology - Mobile electronic nose based on carbon nanotube-SnO2 gas sensors: Feature extraction techniques and its application