This author has not been identified. Look up 'Ruihua Song' in GoogleThis author has not been identified. Look up 'Dingquan Wang' in GoogleThis author has not been identified. Look up 'Jian-Yun Nie' in GoogleThis author has not been identified. Look up 'Ji-Rong Wen' in GoogleThis author has not been identified. Look up 'Yong Yu' in Google