本文提出了一种可以带来启发式知识指导蚂蚁在二维网格空间移动。降低移动蚂蚁的随机性，避免了产生“未分配的数据对象”。我们通过实验结果表明，这种改进的聚类启发式蚁群算法具有优越性并减少在经典算法的运行时间。-An improved heuristic ant—clustering algorithm(HAC)is presented in this paper．A device of memory bank is proposed，which can bring forth heuristic

HAC 层次聚类算法，这个算法建立簇是进过特殊计算的，在合并之后进行评价-The algorithm for building clusters is computationally optimized. After merging the clusters only those matrix elements that are affected by merging are recalculated. The speed is increased in several hundred time

HAC 层次聚类算法，这个算法建立簇是进过特殊计算的，在合并之后进行评价-The algorithm for building clusters is computationally optimized. After merging the clusters only those matrix elements that are affected by merging are recalculated. The speed is increased in several hundred time

hierarchical Archimedean copulas (HAC) for the US, the German and the Japanese stock market.(financial contagion is modelled by means of hierarchical Archimedean copulas (HAC) for the US, the German and the Japanese stock market. The time-varying nat