Journal Information Maejo International Journal of Science and Technology (ISSN 1905-7873 © 2011), the international journal for preliminary communications in Science and Technology is the first peerrefereed scientific journal of Maejo University (www.mju.ac.th). Intended as a medium for communication, discussion, and rapid dissemination of important issues in Science and Technology, articles are initially published online in an open access format, which thereby gives authors the chance to communicate with a wide range of readers in an international community. Publication Information MIJST is published triannually. Articles are available online and can be accessed free of charge at http://www.mijst.mju.ac.th. Printed and bound copies of each volume are produced and distributed to authors and selected groups or individuals. This journal and the individual contributions contained in it are protected under the copyright by Maejo University. Abstracting/Indexing Information MIJST is covered and cited by Science Citation Index Expanded, SCOPUS, Journal Citation Reports/Science Edition, Zoological Record, Chemical Abstracts Service (CAS), SciFinder Scholar, Directory of Open Access Journals (DOAJ) and Google Scholar. Contact Information Editorial office: Maejo International Journal of Science and Technology (MIJST), 1st floor, Orchid Building, Maejo University, San Sai, Chiang Mai 50290, Thailand Tel: +66-53-87-3880 E-mails:
[email protected] MAEJO INTERNATIONAL JOURNAL MAEJO INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY OF SCIENCE AND TECHNOLOGY Editor Duang Buddhasukh, Maejo University, Thailand. The International Journal for the Rapid Publication of Preliminary Associate Editors Communications in Science and Technology Jatuphong Varith, Maejo University, Thailand. Wasin Charerntantanakul, Maejo University, Thailand. Morakot Sukchotiratana, Chiang Mai University, Thailand.