The solution of the projection on inward concave composition surface of cylinder and cone is discussed. and the critical point on the projection is calculated with analytical method.
本文着重介绍内凹的圆柱和圆锥组合面上落影的求法，并尝试利用解析的方法，求出落影上的特殊点。
The BFGS algorithm applied in GCS is analyzed and pointed out two shortcomings: (1) always trapped in local optimal solution; (2) can not pass through the critical point.
分析了BFGS算法在约束求解中的应用，指出了在约束求解这一特定的领域利用BFGS算法进行约束求解的两大缺陷：（1）容易陷入局部最优解：（2）无法穿越临界点。
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