In this study, the phylogenetic trees of chemokines and chemokine receptorsare produced, based on distance parsimonious method, using available amino acid sequences from GenBank. 通过分析现有的趋化因子和趋化因子受体的氨基酸序列，用距离法和最简约法构建了聚类图，探讨了趋化因子和趋化因子受体基因家族的系统演化特征。
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. 将故障点法与临界距离法相结合，提出一种计算电压暂降域的方法。
