本文利用等腰正交的性质和相关理论研究R~2空间上的度量椭圆的结构和性质及与等腰正交有关的几何常数。
By the theories of isosceles orthogonality, the properties and structure of metric ellipses in R~2and the geometry constants associated with isosceles orthogonality are studied in this paper.
传统金融理论通常把收益率的方差作为风险的度量指标，并在选择证券组合时假设市场方差为常数。
We usually take variance as the index of capital market venture, and suppose that the variance of market return is a constant.
针对现有的无监督异常检测技术的不足之处，提出了一种基于样本分布异常数据实例度量方法。
Aiming at the weaknesses of current unsupervised anomaly detection techniques, a measurement approach about samples distribution of anomaly data is proposed.
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