为了更好地进行版权保护，针对现有数字水印算法存在的缺点，提出了一种新的不对称公钥水印思想，并首先指出目前用于版权保护的鲁棒性数字水印算法所存在的缺点和不对称公钥水印算法的优点，然后提出能克服这些缺点的不对称公钥水印算法思想；同时根据算法模型的需要，设计了一种新的具有较好相关特性的伪随机序列。并对其自相关特性进行了证明；最后具体描述了所提出的算法实例，并进行了仿真试验。试验结果证明，该算法思想是可行的，所设计的算法实例具有较好的鲁棒性和较强的抗攻击能力。

In this paper the method to calculate intangible quality cost is put forward for the first time based on the production and management characteristics of coal preparation plant．A model for assessment of quality management performance of coal preparation plant is established on the ground of quality cost. By using of CIMS integration environment the strategy to carry out the model and the application example are also offered．It provides a new and feasible way to asses pe rformance quality management of coal preparation plant.