Purpose: To study the clinical value of bi-direction drainage by PTCD in the therapy of malignant obstructive jaundice.
目的：探讨通过PT CD内外引流对恶性阻塞性黄疸的治疗价值以及操作方法的改进。
For the images of bad light conditions, propose an algorithm which first rotates coordinates and then bi-direction reconstruction.
针对光照条件不好的图像，提出了一种先旋转坐标轴，后双向重建的算法。
The mobile host adaptively chooses bi-direction tunneling or remote subscription to perform the multicast handoff according to its mobility pattern.
移动主机根据移动模式和当前移动状态自适应地选择双向隧道机制或者远程加入机制完成组播切换。
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