Copyright (C) 2011 by Information System Engineering Research Labolatory, Burapha University
    http://iserl.buu.ac.th
    iserl.callcenter@gmail.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your opinion) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, see  (GPLv2)
    or write to the Free Software Foundation, Inc., 51 Franklin Street,
    Fifth Floor, Boston, MA02110-1301, USA.