Previous studies have primarily focused on converting point clouds(PC)into a dense mech of 3Dfinite element models,neglecting the conversion of PCs into as-built wireframe models with two-node elements for line elemen...Previous studies have primarily focused on converting point clouds(PC)into a dense mech of 3Dfinite element models,neglecting the conversion of PCs into as-built wireframe models with two-node elements for line elements such as beams and columns.This study aims to demonstrate the feasibility of this direct conversion,utilizing building framing patterns to create wireframe models.The study also integrates the OpenSeesPy package for modal analysis and double integration for bending estimation to demonstrate the application of the presented method in robotic inspection.Results indicate the successful conversion of a 4-story mass timber building PC to a 3D structural model with an average error of 7.5%under simplified assumptions.Further,two complex mass timber shed PCs were tested,resulting in detailed wireframe models.According to resource monitoring,our method can process∼593points/second,mostly affected by the number of neighbors used in thefirst stage of sparse points removal.Lastly,our method detects beams,columns,ceilings(floors),and walls with their directions.This research can facilitate various structural modeling directly based on PC data for digital twinning and autonomous robotic inspection.展开更多
在低气压环境下对两节点模型进行了修正,同时通过实测皮肤温度验证了其准确性。在此基础上对热环境评价指标——标准有效温度(SET*)进行了计算,分析了低气压下SET*的变化规律,并在不同低气压环境下对ASHRAE Standard 55中的舒适区进行...在低气压环境下对两节点模型进行了修正,同时通过实测皮肤温度验证了其准确性。在此基础上对热环境评价指标——标准有效温度(SET*)进行了计算,分析了低气压下SET*的变化规律,并在不同低气压环境下对ASHRAE Standard 55中的舒适区进行了修正。计算结果表明,在相同环境参数条件下,随着大气压力的降低,对应的标准有效温度降低。相应地,随大气压力的下降,人体舒适区范围向干球温度较高的方向移动。低气压环境下舒适区对应的干球温度上下限值均比常压下高,且温差范围增大。展开更多
目的:探讨胸、腹腔镜中期(Ⅱ、Ⅲ期)食管癌切除术二野淋巴结清扫的安全性、根治性及临床价值。方法:回顾性对比分析2009年1月至2013年7月胸、腹腔镜手术和开放手术行二野淋巴结清扫的Ⅱ、Ⅲ期食管癌410例资料(开放组193例、全腔镜组217...目的:探讨胸、腹腔镜中期(Ⅱ、Ⅲ期)食管癌切除术二野淋巴结清扫的安全性、根治性及临床价值。方法:回顾性对比分析2009年1月至2013年7月胸、腹腔镜手术和开放手术行二野淋巴结清扫的Ⅱ、Ⅲ期食管癌410例资料(开放组193例、全腔镜组217例)。2组性别、年龄、术前合并症、肿瘤侵犯深度、肿瘤位置等无显著性差异(P>0.05)。比较两组手术情况、术后并发症等,分析两种手术方式的临床效果。结果:与开放组比较,腔镜组术中出血量少[(206±138)m L vs.(240±111)m L,t=2.726,P=0.007],清扫淋巴结多[(26.6±8.6)枚vs.(21.7±9.2)枚,t=-5.626,P<0.001],胸腔手术时间短[(157±36)min vs.(166±31)min,t=-2.696,P=0.007],总体并发症发生率低[25.8%(56/217)vs.35.2%(68/193),χ2=4.303,P=0.038]。全腔镜组肺部感染、心律失常的发生率明显低于开放组(P<0.05),而吻合口狭窄、声音嘶哑发生率高于开放组(P<0.05)。结论:胸、腹腔镜联合食管癌切除二野淋巴结清扫术安全、可行,淋巴结清扫更彻底,值得在Ⅱ、Ⅲ期食管癌中推广应用。展开更多
文摘Previous studies have primarily focused on converting point clouds(PC)into a dense mech of 3Dfinite element models,neglecting the conversion of PCs into as-built wireframe models with two-node elements for line elements such as beams and columns.This study aims to demonstrate the feasibility of this direct conversion,utilizing building framing patterns to create wireframe models.The study also integrates the OpenSeesPy package for modal analysis and double integration for bending estimation to demonstrate the application of the presented method in robotic inspection.Results indicate the successful conversion of a 4-story mass timber building PC to a 3D structural model with an average error of 7.5%under simplified assumptions.Further,two complex mass timber shed PCs were tested,resulting in detailed wireframe models.According to resource monitoring,our method can process∼593points/second,mostly affected by the number of neighbors used in thefirst stage of sparse points removal.Lastly,our method detects beams,columns,ceilings(floors),and walls with their directions.This research can facilitate various structural modeling directly based on PC data for digital twinning and autonomous robotic inspection.
文摘在低气压环境下对两节点模型进行了修正,同时通过实测皮肤温度验证了其准确性。在此基础上对热环境评价指标——标准有效温度(SET*)进行了计算,分析了低气压下SET*的变化规律,并在不同低气压环境下对ASHRAE Standard 55中的舒适区进行了修正。计算结果表明,在相同环境参数条件下,随着大气压力的降低,对应的标准有效温度降低。相应地,随大气压力的下降,人体舒适区范围向干球温度较高的方向移动。低气压环境下舒适区对应的干球温度上下限值均比常压下高,且温差范围增大。
文摘目的:探讨胸、腹腔镜中期(Ⅱ、Ⅲ期)食管癌切除术二野淋巴结清扫的安全性、根治性及临床价值。方法:回顾性对比分析2009年1月至2013年7月胸、腹腔镜手术和开放手术行二野淋巴结清扫的Ⅱ、Ⅲ期食管癌410例资料(开放组193例、全腔镜组217例)。2组性别、年龄、术前合并症、肿瘤侵犯深度、肿瘤位置等无显著性差异(P>0.05)。比较两组手术情况、术后并发症等,分析两种手术方式的临床效果。结果:与开放组比较,腔镜组术中出血量少[(206±138)m L vs.(240±111)m L,t=2.726,P=0.007],清扫淋巴结多[(26.6±8.6)枚vs.(21.7±9.2)枚,t=-5.626,P<0.001],胸腔手术时间短[(157±36)min vs.(166±31)min,t=-2.696,P=0.007],总体并发症发生率低[25.8%(56/217)vs.35.2%(68/193),χ2=4.303,P=0.038]。全腔镜组肺部感染、心律失常的发生率明显低于开放组(P<0.05),而吻合口狭窄、声音嘶哑发生率高于开放组(P<0.05)。结论:胸、腹腔镜联合食管癌切除二野淋巴结清扫术安全、可行,淋巴结清扫更彻底,值得在Ⅱ、Ⅲ期食管癌中推广应用。
