Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-07 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To observe the effect of one lung ventilation (OLV) preconditioning on perioperative oxygenation during pediatric video-assisted thoracoscopic surgeries (VATS). Methods A total of 171 children aged 5 days to 11 years underwent VATS for empyema dissection and abscess excisions (n=55), mediastinal tumor resection (n=34), repair of the diaphragmatic hernia or diaphragmatic plication (n=21), pulmonary lobectomy or biopsy (n=43), or esophageal disease (n=18). Of these patients, 127 were younger than 3 years of age. A 5-Fr pediatric endobronchial blocker was used for OLV with a delivered inspired oxygen fraction (FiO2) of 1.0. After lateral decubitus, a sequential protocol of a 5- to 8-min OLV preconditioning and a 5-min two lung ventilation (TLV) was performed followed by OLV again before incision for VATS. In cases of a SpO 2 <95% without malposition of the blocker during OLV, a 5 cm H2O positive end expiratory pressure was applied; TLV was maintained for a SpO2 <90%. Results OLV provided good surgical conditions in 160 cases. Acceptable saturations were achieved in 166 cases during OLV. In 2 cases in empyema group and 3 in esophageal disease group, the ventilation protocol was converted to intermittent TLV during the operation due to hypoxemia. In esophageal disease group, the procedure and OLV duration, postoperative ventilation time and length of stay (LOS) were the longest among the groups, and the number of cases developing postoperative atelectasis was greater than that in diaphragmatic hernia and pulmonary disease groups. In empyema and esophageal disease groups, the oxygenation index (PaO2 /FiO2) after total collapse of the lung in OLV and after extubation were lower than that in mediastinal tumor group (P<0.05 or 0.01). Conclusion OLV preconditioning can maintain an acceptable oxygenation during pediatric OLV. A longer procedure and OLV duration is associated with a prolonged postoperative length of ventilation and LOS.
Subjects: Computer Science >> Computer Hardware Technology Subjects: Computer Science >> Computer Network submitted time 2017-03-09
Abstract：全球路由表的高速膨胀使得当前的互联网域间路由系统的可扩展性面临着严峻的挑战。为了缩减路由表,很多研究提出了新的路由解决方案。本文在介绍了互联网路由系统现状之后,从较高层次上将存在的路由解决方案分为短期方案、路由架构和可扩展路由算法三部分，着重讨论了路由算法和路由架构这两类工作,对经典的可扩展路由算法和路由架构进行了分析和比较，最后对尚未解决的问题和未来的研究方向进行了总结和展望。
Peer Review Status:
Awaiting Review
Subjects: Computer Science >> Computer Application Technology Subjects: Computer Science >> Computer Network submitted time 2017-03-09
Abstract：对等传输（P2P）内容分发系统能大幅减轻对等传输内容提供商的分发代价，提高系统的可扩展性。但是，覆盖网络和底层网络的不匹配导致了网络资源的浪费，产生了大量的冗余流量，激化了内容提供商和网络运营商（ISP）之间的矛盾。因此，如何有效利用底层网络的带宽资源，降低对等传输内容分发系统对ISP 网络的流量压力，是目前对等传输内容分发系统研究的热点，也是对等传输系统可持续发展的关键。本文从对等传输缓存、位置感知技术和数据调度算法三个维度出发详细阐述了不同的对等传输流量优化技术，探讨了各种技术的适用环境，指出了存在的问题和未来的方向。
Peer Review Status:Awaiting Review
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