In this study, the phylogenetic trees of chemokines and chemokine receptorsare produced, based on distance parsimonious method, using available amino acid sequences from GenBank. 通過分析現有的趨化因子和趨化因子受體的氨基酸序列，用距離法和最簡約法構建了聚類圖，探討了趨化因子和趨化因子受體基因家族的系統演化特徵。
Furthermore, based on combining the methods of the fault location and the critical distance, a new method is proposed to determine the regions of voltage sags. 將故障點法與臨界距離法相結合，提出一種計算電壓暫降域的方法。
