title: Application of revised version of neural independent component analysis to classification problems of confiscated methamphetamine.
abstract: Recently, profiling the chemical substances in illegally distributed drugs has been needed in order to reveal the drug channels. However, this kind of profiling is often difficult because such drugs contain various kinds of impurities and the quantity of these impurities changes. Due to these circumstances, several methods, including a slightly revised ICA (Independent Component Analysis) by a Hebbian learning artificial neural network, were applied for profiling illegally distributed methamphetamine. Eventually, better classification results with the ICA than with other methods were obtained. These results show that ICA could make it easier to profile illegally distributed methamphetamine.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Osaka University, Yamadaoka, Suita, Osaka, Japan. ttakagi@phs.osaka-u.ac.jp
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Takagi
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Makino
authors.forename: Yuko
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Kousuke
authors.initials: K
authors.lastname: Okamoto
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Yamashita
authors.forename: Tomoko
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Masahiko
authors.initials: M
authors.lastname: Yokota
authors.forename: Ken
authors.initials: K
authors.lastname: Kurokawa
authors.forename: Teruo
authors.initials: T
authors.lastname: Yasunaga
mesh_terms: D000465:Algorithms; D000697:Central Nervous System Stimulants / Q000032:analysis*; D004340:Drug Contamination; D008401:Gas Chromatography-Mass Spectrometry; D013287:Illicit Drugs / Q000032:analysis*; D008694:Methamphetamine / Q000032:analysis*; D016571:Neural Networks, Computer; D025341:Principal Component Analysis
chemical_list: D000697:Central Nervous System Stimulants; D013287:Illicit Drugs; D008694:Methamphetamine