The research work has been seldom done about cloverleaf junction expression in a 3-dimensional city model (3DCM). The main reason is that the cloverleaf junction is often in a complex and enormous construction. Its ma...The research work has been seldom done about cloverleaf junction expression in a 3-dimensional city model (3DCM). The main reason is that the cloverleaf junction is often in a complex and enormous construction. Its main body is bestraddle in air,and has aerial intersections between its parts. This complex feature made cloverleaf junction quite different from buildings and terrain, therefore, it is difficult to express this kind of spatial objects in the same way as for buildings and terrain. In this paper,authors analyze spatial characteristics of cloverleaf junction, propose an all-constraint points TIN algorithm to partition cloverleaf junction road surface, and develop a method to visualize cloverleaf junction road surface using TIN. In order to manage cloverleaf junction data efficiently, the authors also analyzed the mechanism of 3DCM data management, extended BLOB type in relational database, and combined R-tree index to manage 3D spatial data. Based on this extension, an appropriate data展开更多
目的:观察单侧下肢手术患者应用改良超声引导"三叶草法"腰丛神经阻滞后的麻醉效果。方法:根据随机数字表法,将我院2020年12月~2023年3月期间收治的86例单侧下肢手术患者分为A组(n=43)和B组(n=43)。A组手术期间接受超声引导&qu...目的:观察单侧下肢手术患者应用改良超声引导"三叶草法"腰丛神经阻滞后的麻醉效果。方法:根据随机数字表法,将我院2020年12月~2023年3月期间收治的86例单侧下肢手术患者分为A组(n=43)和B组(n=43)。A组手术期间接受超声引导"三叉戟"LPB技术定位,B组手术期间接受改良超声引导"三叶草法"定位。对比两组一次神经阻滞成功率、调整穿刺针方向次数、定位时间、穿刺时间、麻醉效果优良率、疼痛视觉模拟评分(VAS),同时观察两组治疗期间不良反应发生情况。结果:B组的一次神经阻滞成功率高于A组,调整穿刺针方向次数少于A组,定位时间、穿刺时间短于A组(P<0.05)。B组麻醉效果优良率高于A组(P<0.05)。B组术后6 h、12 h、24 h VAS评分低于A组(P<0.05)。两组不良反应发生率对比未见差异(P>0.05)。结论:与超声引导"三叉戟"LPB技术应用于单侧下肢手术患者相比,改良超声引导"三叶草法"定位可缩短定位时间、穿刺时间,减少调整穿刺针方向次数,减轻术后疼痛,提高麻醉效果。展开更多
文摘The research work has been seldom done about cloverleaf junction expression in a 3-dimensional city model (3DCM). The main reason is that the cloverleaf junction is often in a complex and enormous construction. Its main body is bestraddle in air,and has aerial intersections between its parts. This complex feature made cloverleaf junction quite different from buildings and terrain, therefore, it is difficult to express this kind of spatial objects in the same way as for buildings and terrain. In this paper,authors analyze spatial characteristics of cloverleaf junction, propose an all-constraint points TIN algorithm to partition cloverleaf junction road surface, and develop a method to visualize cloverleaf junction road surface using TIN. In order to manage cloverleaf junction data efficiently, the authors also analyzed the mechanism of 3DCM data management, extended BLOB type in relational database, and combined R-tree index to manage 3D spatial data. Based on this extension, an appropriate data
文摘目的:观察单侧下肢手术患者应用改良超声引导"三叶草法"腰丛神经阻滞后的麻醉效果。方法:根据随机数字表法,将我院2020年12月~2023年3月期间收治的86例单侧下肢手术患者分为A组(n=43)和B组(n=43)。A组手术期间接受超声引导"三叉戟"LPB技术定位,B组手术期间接受改良超声引导"三叶草法"定位。对比两组一次神经阻滞成功率、调整穿刺针方向次数、定位时间、穿刺时间、麻醉效果优良率、疼痛视觉模拟评分(VAS),同时观察两组治疗期间不良反应发生情况。结果:B组的一次神经阻滞成功率高于A组,调整穿刺针方向次数少于A组,定位时间、穿刺时间短于A组(P<0.05)。B组麻醉效果优良率高于A组(P<0.05)。B组术后6 h、12 h、24 h VAS评分低于A组(P<0.05)。两组不良反应发生率对比未见差异(P>0.05)。结论:与超声引导"三叉戟"LPB技术应用于单侧下肢手术患者相比,改良超声引导"三叶草法"定位可缩短定位时间、穿刺时间,减少调整穿刺针方向次数,减轻术后疼痛,提高麻醉效果。
