Fix coding miss ( use of 'this' keyword in static function )
Fix coding miss ( use of 'this' keyword in static function )

Hiroyuki-Nagata/JaneClone,Hiroyuki-Nagata/JaneClone,Hiroyuki-Nagata/JaneClone,Hiroyuki-Nagata/JaneClone,Hiroyuki-Nagata/JaneClone,Hiroyuki-Nagata/JaneClone,Hiroyuki-Nagata/JaneClone