具有任意自由度的B样条非均匀细分*

为了便于工程实际应用，非均匀细分方法现在已经成为计算机图形学和几何建模中的热点问题。本文提出一个具有任意自由度的B样条非均匀细分算法，其实现与B样条均匀细分即Lane–Riesenfeld细分方法相似。该算法包含了非均匀d环结构生成的双重控制点，其中d环相似于d度均匀B样条曲线的Lane-Riesenfeld算法中均匀的d环结构。Lane-Riesenfeld算法是由B样条曲线基函数的连续卷积公式直接得出的，而本文的算法是blossoming方法的一个扩展。对于非均匀B样条曲线来说，本文的节点插入方法比之前的方法更简单更有效。

Non-uniform subdivision for B-splines of arbitrary degree

This paper proposes a cross-layer packet scheduling scheme based on the HSDPA system for supporting diverse QoS requirements of mixed services. During the process, mixed services are classified according to service types, QoS levels and user status. We introduce service QoS and channel status parameters into computation to estimate probability, try to achieve a balance between mixed services quality and system performance. Simulation results indicate that our scheme has superior performance in the domain of transmission delay, data throughput.