This author has not been identified. Look up 'Tinghuai Ma' in GoogleThis author has not been identified. Look up 'Wei Tian' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'B. Wang' in GoogleThis author has not been identified. Look up 'D. H. Guan' in GoogleThis author has not been identified. Look up 'Sung Young Lee' in Google