检索结果-南通市图书馆

Unified numerical predictor-corrector guidance based on characteristic model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国空间科学技术（中英文） 2024年第4期44卷 40-49页

作者： MENG Bin ZHANG Hangning zhao yunbo Beijing Institute of Control Engineering Beijing 100094China National Key Laboratory of Space Intelligent Control Beijing 100094China University of Science and Technology of China Hefei 230026China

Aerocapture is one of the key technologies for low-cost transportation,with high demands of autonomy,accuracy,and robustness of guidance and control,due to its high reliability requirements for only one chance of trying.A unified numerical predictor-corrector guidance method based on characteristic models for aerocapture is *** numerical predictor-corrector guidance method is used to achieve autonomy and high accuracy,and the characteristic model control method is introduced to achieve *** the same time,by transforming path constraints,characteristic model equations including apogee deviation and altitude differentiation are *** on the characteristic model equations,a unified guidance law which can satisfy path constraints and guidance objectives simultaneously is *** guidance problems,guidance deviation is not directly obtained from the output of the dynamics at present,but is calculated through integral and algebraic ***,the method of directly discretizing differential equations cannot be used to establish characteristic models,which brings great difficulty to characteristic modeling.A method for characteristic modeling of guidance problems is proposed,and convergence analysis of the proposed guidance law is also ***,a joint numerical simulation of guidance and control considering navigation deviation and various uncertainties is conducted to verify the effectiveness of the proposed *** proposed unified method can be extended to general aerodynamic entry guidance designs,providing theoretical and methodological support for them.

关键词： aerocapture path constraint characteristic model unified numerical predictor-corrector guidance convergence

Modelling and Optimizing Motherboard Functional Testing in Laptop Manufacturing

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年

作者： KANG Yu BAI Peng WANG Kangcheng zhao yunbo DONG Shaojie Department of Automation & Institute of Advanced Technology University of Science and Technology of China Institute of Artificial Intelligence Hefei Comprehensive National Science Center Department of Automation University of Science and Technology of China Institute of Advanced Technology University of Science and Technology of China

Functional testing is key to fulfill quality control in laptop manufacturing and is of great economic value. However, due to the unavailability of practical data, mathematical model and systematic perspective, it has barely been touched from the academic community to date. For the first time,this work provides technical understanding of the key principles of functional testing, mathematically models the general framework, elucidates existing testing strategy under the proposed framework and model, and finally proposes a specified optimization strategy which outperforms existing *** work lays the model foundation for the further optimization of functional testing, and can be regarded as a good example of how a systematic approach can solve practical industrial challenges.

关键词：

银杏硫酸盐木质素组分分离及其抗肿瘤构效研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

林产化学与工业 2024年第1期44卷 17-23页

作者：谢益民岳园园赵云博魏鑫湖北工业大学制浆造纸研究院湖北武汉430068 湖北工业大学绿色轻工材料湖北省重点实验室湖北武汉430068

为了从硫酸盐木质素中提取具有抗肿瘤活性的成分,以不同极性的溶剂对银杏硫酸盐木质素(KL)进行分级,利用MTT法研究各分级组分的抗肿瘤活性;根据抗肿瘤活性结果,利用中压制备液相色谱对抑制效果最明显组分进行纯化,采用质谱、^(13)C NMR... 详细信息

为了从硫酸盐木质素中提取具有抗肿瘤活性的成分,以不同极性的溶剂对银杏硫酸盐木质素(KL)进行分级,利用MTT法研究各分级组分的抗肿瘤活性;根据抗肿瘤活性结果,利用中压制备液相色谱对抑制效果最明显组分进行纯化,采用质谱、^(13)C NMR等方法确定其结构,并分析构效关系。FT-IR分析结果表明:KL具有与银杏磨木木质素(MWL)相似的结构;分级组分的总酚含量(TPC)随着其相对分子质量增加而降低。抗肿瘤实验结果表明:乙醚可溶组分(LC2)对人源肺癌A549细胞的抑制作用最强,IC_(50)值为(366.09±6.39) mg/L。LC2纯化结果发现,分离出的化合物L7的抗肿瘤活性最好,对肺癌A549细胞的IC_(50)值为(89.44±2.13) mg/L。质谱、^(13)C NMR测试结果表明:化合物L7是酚羟基上连接着2-丙醛取代基的β-5结构的松柏醛二聚体。木质素小分子物质的苯丙烷单元侧链上醛基的增加会提高抗癌活性,但是醚键的增加会降低抗癌活性。

关键词：硫酸盐木质素分级组分生理活性化合物抗肿瘤活性化学结构

促进学生科学探究核心素养发展的教学设计——以“现代生物进化理论的由来”为例

在线全文

学校读者我要写书评

暂无评论

生物学通报 2024年第6期59卷 36-38页

作者：赵云波甘肃省正宁县第一中学甘肃庆阳745300

以“现代生物进化理论的由来”为例,通过创设真实学习情境,以问题链驱动学生的高阶思维,让学生了解生物进化理论,应用生物进化理论解决在实际问题中遇到的困难,评价拉马克、达尔文进化学说的优势和局限以及理论的发展过程,从而发展科学... 详细信息

以“现代生物进化理论的由来”为例,通过创设真实学习情境,以问题链驱动学生的高阶思维,让学生了解生物进化理论,应用生物进化理论解决在实际问题中遇到的困难,评价拉马克、达尔文进化学说的优势和局限以及理论的发展过程,从而发展科学思维、科学探究和社会责任。

关键词：情境创设核心素养教学设计高中生物学

The Dynamics Characteristics of Flexible Spacecraft and Its Closed-Loop Stability with Passive Control

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2021年第3期34卷 860-872页

作者： MENG Bin zhao yunbo Beijing Institute of Control Engineering Beijing 100094China Science and Technology on Space Intelligent Control Laboratory Beijing 100094China Zhejiang University of Technology Hangzhou 310014China

Passive control is the most popular methodology for flexible spacecraft while it remains an open problem whether the closed-loop performance can be achieved only with passive control subject to the coupling modes of rigid and ***,the closed-loop performance of passive PD control based on the dynamics of the Euler angle parameterization of spacecraft,which has been widely used in practice,is yet to be *** these challenges,by introducing the input-output exact linearization theory and Lyapunov theory,the authors show that the closed-loop performance for flexible spacecraft with rigid and flexible modes can be achieved by adjusting the parameters of the passive controllers sufficiently *** is done by firstly transforming the flexible spacecraft dynamics into an exact feedback linearization standard form,and then analyzing the closed-loop performance of flexible spacecraft.

关键词： Closed-loop stability flexible spacecraft internal dynamics input-output exact linearization passive control

Dynamic data packing towards the optimization of QoC and QoS in networked control systems

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第1期59卷 72-80页

作者： KANG Yu zhao yunbo Department of Automation and State Key Laboratory of Fire Science University of Science and Technology of China Key Laboratory of Technology in Geo-Spatial Information Processing and Application System Chinese Academy of Sciences Department of Automation Zhejiang University of Technology

A class of networked control systems is investigated whose communication network is shared with other applications. The design objective for such a system setting is not only the optimization of the control performance but also the efficient utilization of the communication resources. We observe that at a large time scale the data packet delay in the communication network is roughly varying piecewise constant, which is typically true for data networks like the Internet. Based on this observation, a dynamic data packing scheme is proposed within the recently developed packet-based control framework for networked control systems. As expected this proposed approach achieves a fine balance between the control performance and the communication utilization: the similar control performance can be obtained at dramatically reduced cost of the communication resources. Simulations illustrate the effectiveness of the proposed approach.

关键词： networked control systems packet delay variation dynamic data packing quality of control quality of service

Bipartite Consensus of Discrete-Time Double-Integrator Multi-Agent Systems with Measurement Noise

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2018年第6期31卷 1525-1540页

作者： MA Cuiqin zhao Weiwei zhao yunbo School of Mathematical Sciences Qufu Normal UniversityQufu 273165China. No.1Senior Middle School of Qufu Qufu 273165China College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

The effects of measurement noise are investigated in the context of bipartite consensus of multi-agent systems. In the system setting, discrete-time double-integrator dynamics are assumed for the agent, and measurement noise is present for the agent receiving the state information from its neighbors. Time-varying stochastic bipartite consensus protocols are designed in order to lessen the harmful effects of the noise. Consequently, the state transition matrix of the closed-loop system is analyzed, and sufficient and necessary conditions for the proposed protocol to be a mean square bipartite consensus protocol are given with the help of linear transformation and algebraic graph theory. It is proven that the signed digraph to be structurally balanced and having a spanning tree are the weakest communication assumptions for ensuring bipartite consensus. In particular, the proposed protocol is a mean square bipartite average consensus one if the signed digraph is also weight balanced.

关键词： Bipartite consensus discrete-time double-integrator measurement noise multi-agent systems

Predictive Event-Triggered Control for Disturbanced Wireless Networked Control Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2021年第3期34卷 1028-1043页

作者： zhao yunbo PAN Xiaokang YU Shiming College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

The control and scheduling for wireless networked control system with packet dropout and disturbance are investigated.A prediction based event triggered control is proposed to reduce data transmissions while preserving the robustness against external ***,a trigger threshold is especially designed to maintain the difference of the estimated and actual states below a proper boundary when system suffers from packet *** a predictive controller is designed to compensate for packet dropouts by utilizing the packet-based control *** sufficient conditions to ensure the closed-loop system being uniformly ultimately bounded are derived,with consequently the controller gain *** examples illustrate the effectiveness of the proposed approach.

关键词： Event-trigger packet-based control wireless networked control systems

肌少症与老年局部进展期结直肠癌患者长期预后的相关性分析

在线全文

学校读者我要写书评

暂无评论

中华老年医学杂志 2024年第7期43卷 851-856页

作者：胡雪晴赵赟博聂鑫施红李琳北京医院肿瘤内科、国家老年医学中心、中国医学科学院老年医学研究院北京100730 北京医院老年医学科、国家老年医学中心、中国医学科学院老年医学研究院北京100730

目的探讨肌少症与老年局部进展期结直肠癌(LACRC)患者长期预后的相关性。方法回顾性分析2014年1月至2018年12月北京医院接受根治性切除术、TNM分期为Ⅱ~Ⅲ期的205例70岁及以上老年LACRC患者的临床资料,应用术前30 d内的腹部CT测量第3腰... 详细信息

目的探讨肌少症与老年局部进展期结直肠癌(LACRC)患者长期预后的相关性。方法回顾性分析2014年1月至2018年12月北京医院接受根治性切除术、TNM分期为Ⅱ~Ⅲ期的205例70岁及以上老年LACRC患者的临床资料,应用术前30 d内的腹部CT测量第3腰椎截面的骨骼肌面积(SMA),肌少症的定义为骨骼肌指数(SMI)(SMI=SMA/身高^(2))男性≤52.4 cm^(2)/m^(2)、女性≤38.5 cm^(2)/m^(2),比较肌少症和非肌少症两组患者的临床和病理情况,分析肌少症对老年LACRC术后患者长期预后的影响。结果205例患者中,63.4%(130/205)患者患有肌少症。与非肌少症患者比较,肌少症组患者中80岁及以上高龄老年人比例更高(χ^(2)=6.420、P=0.011)、超重或肥胖的比例更低(χ^(2)=9.366、P=0.009)、接受辅助化疗比例和术后5年无疾病生存率更低(χ^(2)=6.257、7.347,P=0.012、0.007)。Kaplan-Meier分析结果显示,非肌少症组的老年LACRC患者无疾病生存(DFS)率优于肌少症组患者(Log-rankχ^(2)=6.919、P=0.009);非肌少症组老年LACRC患者中,辅助化疗组DFS率优于非辅助化疗组(Log-rankχ^(2)=4.745、P=0.029)。多因素Cox回归分析结果显示,TNM分期为Ⅲ期(HR=1.634,95%CI:1.110~2.404,P=0.013)和患肌少症(HR=1.509,95%CI:1.017~2.238,P=0.041)是老年LACRC患者长期预后不良的影响因素。结论肌少症和老龄及体质指数相关,患有肌少症的老年LACRC患者长期预后欠佳,非肌少症的老年LACRC患者可能获益于辅助化疗。

关键词：结直肠肿瘤预后肌少症