1. Central Mechanical Engineering Research Institute; M.G. Avenue, Durgapur-713209, WB, India. Tel.: ; Fax: ; E-mail: nandiarup@yahoo.com
2. Department of Computer Science, University of Applied Sciences BS/WF; Salzdahlumer Str. 46/48, 38302, Wolfenbuettel, Germany, E-mail: f.klawonn@fh-wolfenbuettel.de