Squashed commit of the following:

commit 4c3b62e0b100931582fe055244e99451896cf4f4
Author: lhyo <srlhyo@gmail.com>
Date:   Tue Nov 12 18:58:18 2013 +0000

    revise all the work before send it!

commit 1ed2394ccc3f3672880dfc55cd99ece3e9debc8a
Author: lhyo <srlhyo@gmail.com>
Date:   Tue Nov 12 18:56:12 2013 +0000

    pay attention on grammar mistakes!