摘要：The spiral has been studied for the first time in the book “About the spirals”, by Archimedes （Greece, 287-212 BC）. In America, the design of spirals seems to have been used previous to Archimedes＇ time, although in the Northwest of Argentina the appearance of this figure in ceramics can be dated between the years 800 and 1,400 （AD）. The spiral is found in cave paintings, in pumpkin carvings and in pottery, particularly those painted inside of plates （pucos in Quechua language）.There can be seen simple linear spirals, double spirals and spirals filled with squares, spirals in two, facing each other symmetrically, as well as spirals joined to bodies of animals. The number of spires detected in the largest spiral is 12, a number of evidently sacred characteristics. When there are several spirals in an earthenware vessel, it can be seen that all of them spin to the same side whether it is clockwise or not. This could have been caused by the predominance of the use of either one hand or the other by the ancient artist. This paper is produced with computer methods used to design spirals in the computer, either Archimedes or the logarithmic ones. Finally, the book： “Man and his symbols” of the psychiatrist Carl Gustav Jung （1875-1961） help to understand this congruencies. In this paper, Mathematics is complemented with the Archeology of art and Psychology.

摘要：针对广义网络控制系统,该文研究了其同时具有测量和控制数据丢失的问题。首先把广义系统进行等价变换使其变为正常系统。然后采用满足Bernoulli分布的随机变量来描述多测量和多控制数据包的随机丢失问题。设计的输出反馈控制器使得闭环系统渐近稳定且满足给定的性能约束。利用矩阵不等式方法给出了动态输出反馈控制器存在的充分条件。采用改进的CCLM算法给出了输出反馈控制器设计参数的求解方法。最后数值例子表明了所提设计方法的有效性。