To register two three - dimension ( 3d ) medical images , the algorithm makes the intensity histogram of the images on the basis of pixel intensity and then iteratively transforms the images rigidly to minimize the intensity differences between the images and determines the one to one correspondence between the pixels 首先根据三维医学图像的象素浓度信息计算出三维图像的浓度直方图，再叠代地对图像进行刚体变换使得配准图像间的浓度距离最小，实现配准图像象素之间的一一对应。
A discretization equation is derived by using a finite volume method in three - dimensional cylindrical polar coordinate system . algebraic equations are solved by iteration with a line - by - line method that is a combination of tdma in axial and radial directions , ctdma in tangential direction and adi method in three directions . the pressure and velocity coupling are solved with the simple algorithm 在三维圆柱坐标下，利用有限体积法推导离散方程；在轴向与径向用三对角矩阵法( tdma ) ，在周向采用循环三对角矩阵法( ctdma ) ，采用交替方向亚松弛叠代法( adi )求解方程；推导同位网格下的压力修正方程，用simple算法处理速度与压力的耦合；为加速收敛，采用适当的松弛因子。
The chapter 9 establishes one two - overlapping generations model , analysis the macro - economic effect of the system transform . the chapter 10 uses one simple vertical equilibrium model , discusses the probability and process of gaining the equilibrium by extend the coverage without reform the current scheme . as the last chapter of the whole paper , chapter 11 summarizes the paper conclusions 其中：第九章建立了简单的两期叠代模型，分析了养老保险制度转轨的宏观经济影响，考察了制度转轨的时机与条件；第十章建立了简单的横向均衡模型，探讨了在制度内实现均衡的现实性、可能性，并对引进新的参保对象实现制度的横向均衡进行了数值模拟。
It mainly includes the discussion of its control subject , object and basic procedures , the research of its model of optimization control , system substitution control and feedback control , the coordination and fuzzy control methods and other more practical control measures 主要内容包括：讨论了绿色营销绩效的控制主体、控制客体和控制基本程序；研究了绿色营销绩效的优化控制模型、系统叠代控制模型和反馈控制模型；提出了协调控制方法、模糊控制方法和较为具体的控制措施。
