An analytic function f in the unit disk D ：= {z ∈ C ： ｜z｜ 〈 1}, standardly normalized, is called close-to-convex with respect to the Koebe function k（z） ：= z/（1-z）2, z ∈ D, if there exists δ ∈ （-π/2,...An analytic function f in the unit disk D ：= {z ∈ C ： ｜z｜ 〈 1}, standardly normalized, is called close-to-convex with respect to the Koebe function k（z） ：= z/（1-z）2, z ∈ D, if there exists δ ∈ （-π/2,π/2） such that Re {eiδ（1-z）2f′（z）} 〉 0, z ∈ D. For the class C（k） of all close-to-convex functions with respect to k, related to the class of functions convex in the positive direction of the imaginary axis, the Fekete-Szego problem is studied.展开更多
A closed-chain robot has several advantages over an open-chain robot, such as high mechanical rigidity, high payload, high precision. Accurate trajectory control of a robot is essential in practical-use. This paper pr...A closed-chain robot has several advantages over an open-chain robot, such as high mechanical rigidity, high payload, high precision. Accurate trajectory control of a robot is essential in practical-use. This paper presents an adaptive proportional integral differential （PID） control algorithm based on radial basis function （RBF） neural network for trajectory tracking of a two-degree-of-freedom （2-DOF） closed-chain robot. In this scheme, an RBF neural network is used to approximate the unknown nonlinear dynamics of the robot, at the same time, the PID parameters can be adjusted online and the high precision can be obtained. Simulation results show that the control algorithm accurately tracks a 2-DOF closed-chain robot trajectories. The results also indicate that the system robustness and tracking performance are superior to the classic PID method.展开更多
目的:对比中心静脉导管(CVC)胸腔闭式引流术(TCD)与胸腔穿刺抽液术治疗结核性胸膜炎(TBP)患者的效果。方法:回顾性选取2020年1月至2023年6月濮阳市第五人民医院60例TBP患者病例资料,按手术方案不同分为两组。以接受CVC-TCD治疗的30例患...目的:对比中心静脉导管(CVC)胸腔闭式引流术(TCD)与胸腔穿刺抽液术治疗结核性胸膜炎(TBP)患者的效果。方法:回顾性选取2020年1月至2023年6月濮阳市第五人民医院60例TBP患者病例资料,按手术方案不同分为两组。以接受CVC-TCD治疗的30例患者列为A组,以接受胸腔穿刺抽液术治疗的30例患者列为B组。对比两组手术效果、围术期指标、术前、术后14 d CD4^(+)/CD8^(+)炎性因子[干扰素-γ(IFN-γ)、肿瘤坏死因子-α(TNF-α)、γ-干扰素诱导蛋白10(IP-10)]、免疫功能(CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+))水平、并发症发生率。结果:A组手术优良率96.67%(29/30)相较于B组73.33%(22/30)更高(P<0.05);A组胸液吸收时间、退热时间相较于B组更短,胸膜厚度、抽液总量相较于B组更低(P<0.05);A组术后14 d血清IFN-γ、TNF-α、IP-10水平相较于B组更低(P<0.05);A组术后14d CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+)水平相较于B组更高(P<0.05);A组并发症发生率3.33%(1/30)相较于B组26.67%(8/30)更低(P<0.05)。结论:与胸腔穿刺抽液术治疗TBP患者相比,经CVC-TCD治疗可进一步提升手术效果,优化围术期指标,缓解机体炎性反应状态,提高免疫功能,降低并发症发生风险。展开更多
文摘An analytic function f in the unit disk D ：= {z ∈ C ： ｜z｜ 〈 1}, standardly normalized, is called close-to-convex with respect to the Koebe function k（z） ：= z/（1-z）2, z ∈ D, if there exists δ ∈ （-π/2,π/2） such that Re {eiδ（1-z）2f′（z）} 〉 0, z ∈ D. For the class C（k） of all close-to-convex functions with respect to k, related to the class of functions convex in the positive direction of the imaginary axis, the Fekete-Szego problem is studied.
基金Project supported bY the National Natural Science Foundation of China （Grant No.50375085）, and the Natural Science Foundation of Shandong Province （Grant No.Y2002F13）
文摘A closed-chain robot has several advantages over an open-chain robot, such as high mechanical rigidity, high payload, high precision. Accurate trajectory control of a robot is essential in practical-use. This paper presents an adaptive proportional integral differential （PID） control algorithm based on radial basis function （RBF） neural network for trajectory tracking of a two-degree-of-freedom （2-DOF） closed-chain robot. In this scheme, an RBF neural network is used to approximate the unknown nonlinear dynamics of the robot, at the same time, the PID parameters can be adjusted online and the high precision can be obtained. Simulation results show that the control algorithm accurately tracks a 2-DOF closed-chain robot trajectories. The results also indicate that the system robustness and tracking performance are superior to the classic PID method.
文摘目的:对比中心静脉导管(CVC)胸腔闭式引流术(TCD)与胸腔穿刺抽液术治疗结核性胸膜炎(TBP)患者的效果。方法:回顾性选取2020年1月至2023年6月濮阳市第五人民医院60例TBP患者病例资料,按手术方案不同分为两组。以接受CVC-TCD治疗的30例患者列为A组,以接受胸腔穿刺抽液术治疗的30例患者列为B组。对比两组手术效果、围术期指标、术前、术后14 d CD4^(+)/CD8^(+)炎性因子[干扰素-γ(IFN-γ)、肿瘤坏死因子-α(TNF-α)、γ-干扰素诱导蛋白10(IP-10)]、免疫功能(CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+))水平、并发症发生率。结果:A组手术优良率96.67%(29/30)相较于B组73.33%(22/30)更高(P<0.05);A组胸液吸收时间、退热时间相较于B组更短,胸膜厚度、抽液总量相较于B组更低(P<0.05);A组术后14 d血清IFN-γ、TNF-α、IP-10水平相较于B组更低(P<0.05);A组术后14d CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+)水平相较于B组更高(P<0.05);A组并发症发生率3.33%(1/30)相较于B组26.67%(8/30)更低(P<0.05)。结论:与胸腔穿刺抽液术治疗TBP患者相比,经CVC-TCD治疗可进一步提升手术效果,优化围术期指标,缓解机体炎性反应状态,提高免疫功能,降低并发症发生风险。
