The straight skeleton of a polygon is the geometric graph obtained by tracing the vertices during a mitered offsetting process. It is known that the straight skeleton of a simple polygon is a tree, and one can naturally derive directions on the edges of the tree from the propagation of the shrinking process. In this paper, we ask the reverse question: Given a tree with directed edges, can it be...

We study the computation of the straight skeleton of a planar straight-line graph (PSLG) by means of the triangulation-based wavefront propagation proposed by Aichholzer and Aurenhammer in 1998, and provide both theoretical and practical insights. As our main theoretical contribution we explain the algorithmic extensions and modifications of their algorithm necessary for computing the straight ...

Introduction: The primary aim of facial reanimation surgery is to restore tone, symmetry, and movement to the paralyzed face. Hypoglossal-facial end-to-side anastomosis provides satisfactory facial reanimation in the irreversible proximal injury of the facial nerve. This study discussed the facial function results of end-to-side anastomosing of hypoglossal nerve to facial nerve when the i...

In a clinical evaluation, thirty-one patients with thoracic esophageal cancer who were treated from 1997 to 2000 were selected as subjects including those who underwent hand sewn anastomosis method, circular stapler method and triangular anastomosis method. Incidence of anastomosis failure was 27.3%, 25.0% and 8.3% for the hand sewn anastomosis method, circular stapler method and triangular ana...

The natural history of total pulmonary venous connection (TAPVC) is unfavorable per se. We describe a modified technique of intra-atrial repair in infants with supra- and infracardiac TAPVC. Twenty patients were treated. The median age at repair was 16 (range 3-62) days. Echocardiography and multi-detector row computed tomography were used to confirm the diagnosis. Our policy was to perform sur...

OBJECTIVE We present two cases of type A aortic dissection repaired with the help of biological glue, that were followed by acute limb ischemia due to embolism of glue. METHODS AND RESULTS A 30-year-old man was diagnosed with aortic dissection from left coronary sinus to right subclavian artery. Under deep hypothermic circulatory arrest (DHCA), distal aortic anastomotic site was reconstructed...

Optimal graft design has been an objective of many researchers to find correlations between hemodynamics and graft failure. Compared to planar grafts, the helical graft configurations improve hemodynamic performance including the promotion of flow mixing and reduction of flow stagnation regions. In order to evaluate the advantages and disadvantages of the suggested helical type bypass graft mod...