Neural marching cubes for open surfaces(面向开放表面的神经移动立方体算法)

移动立方体（marching cubes，MC）是一种经典的等值面提取算法，但此算法建立在将空间点划分为内部点和外部点基础上，只适用于封闭表面的重建。为解决此问题，提出一种面向开放表面的神经移动立方体算法。通过引入称作无关点的新的空间点分类，因无关点与内部点、外部点以及无关点之间形成的空间区域不存在零等值面，从而可连通三维形状的内部和外部。无关点可通过与表面间的距离直接判断，无需复杂的网络或计算。同时，用引入注意力机制的残差模块代替原网络，以改善重建效果。此外，设计新的曲面细分，借助无关点实现对开放表面的重建。最后，通过加入对边缘的平滑处理，提高边缘部分的重建质量。在多项评估指标下对封闭表面和开放表面进行了测试，证明所提方法不仅能重建封闭表面，而且实现了对开放表面的高质量重建

Lymph Node Dissection Is a Risk Factor for Short-Term Cough after Pulmonary Resection

Cough is a common complication after pulmonary resection. However, the factors associated with cough that develop after pulmonary resection are still controversial. In this study, we used the Simplified Cough Score (SCS) and the Leicester Cough Questionnaire (LCQ) score to investigate potential risk factors for postoperative cough. Between January 2017 and June 2021, we collected the clinical data of 517 patients, the SCS at three days after surgery and the LCQ at two weeks and six weeks after surgery. Then, univariate and multivariate analyses were used to identify the independent risk factors for postoperative cough. The clinical baseline data of the cough group and the non-cough group were similar. However, the cough group had longer operation time and more blood loss. The patients who underwent lobectomy were more likely to develop postoperative cough than the patients who underwent segmentectomy and wedge resection, while the patients who underwent systematic lymph node dissection were more likely to develop postoperative cough than the patients who underwent lymph node sampling and those who did not undergo lymph node resection. When the same lymph node management method was applied, there was no difference in the LCQ scores between the patients who underwent wedge resection, lobectomy and segmentectomy. The lymph node resection method was an independent risk factor for postoperative cough (p < 0.001). Conclusions: Lymph node resection is an independent risk factor for short-term cough after pulmonary resection with video-assisted thoracoscopic surgery, and damage to the vagus nerve and its branches (particularly the pulmonary branches) is a possible cause of short-term cough. The mechanism of postoperative cough remains to be further studied

Towards the ultimate PMT waveform analysis for neutrino and dark matter experiments

Photomultiplier tube (PMT) voltage waveforms are the raw data of many neutrino and dark matter experiments. Waveform analysis is the cornerstone of data processing. We evaluate the performance of all the waveform analysis algorithms known to us and find fast stochastic matching pursuit the best in accuracy. Significant time (up to 2 times) and energy (up to 1.07 times) resolution boosts are attainable with fast stochastic matching pursuit, approaching theoretical limits. Other methods also outperform the traditional threshold crossing approach in time resolution.Comment: Source code is hosted at https://github.com/heroxbd/waveform-analysi