KMV模型用来计算违约率和违约距离，已知违约率求市场波动率-KMV model is used to calculate the default rate and default distance, the known default rate for the market volatility

KMV模型求解-方程与方程组的数值解、KMV模型方程组的求解(KMV Model Solution - Numerical Solution of Equations and Systems and Solution of KMV Model Equations)