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具有输入量化和执行器故障的非线性多智能体系统的自适应包容控制

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高师理科学刊 2024年第7期44卷 15-27页

作者：石琳武力兵辽宁科技大学理学院辽宁鞍山114051

研究了一类具有输入量化、外部扰动及动态领导者的非线性严格反馈多智能体系统的自适应容错包容控制问题.通过建立带有未知估计的阻尼项、正时变积分函数、一阶滤波器和补偿信号的参数更新律,提出了一种自适应反步控制方案.该方案在补... 详细信息

研究了一类具有输入量化、外部扰动及动态领导者的非线性严格反馈多智能体系统的自适应容错包容控制问题.通过建立带有未知估计的阻尼项、正时变积分函数、一阶滤波器和补偿信号的参数更新律,提出了一种自适应反步控制方案.该方案在补偿滤波误差的同时在虚拟控制律中引入新的光滑函数来降低量化的影响,利用有界估计法克服了故障只能发生有限次的限制,保证所有跟随者的输出收敛于领导者的输出所形成的凸包内,且所有的信号都是有界的.仿真结果验证了该方案的有效性.

关键词：多智能体系统输入量化执行器故障自适应反步控制包容控制

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一类时滞多智能体系统的事件触发容错控制

兰州工业学院学报 2024年第3期31卷 95-102页

作者：崔国飞武力兵辽宁科技大学理学院辽宁鞍山114051

针对时变通讯时滞下,具有执行器故障和参数不确定性的多智能体系统事件触发一致性控制问题,利用线性矩阵不等式(LMI)技术,设计了反馈控制增益矩阵;为降低通信资源的消耗,设计了基于模型的动态事件触发机制;通过李雅普诺夫稳定性理论证... 详细信息

针对时变通讯时滞下,具有执行器故障和参数不确定性的多智能体系统事件触发一致性控制问题,利用线性矩阵不等式(LMI)技术,设计了反馈控制增益矩阵;为降低通信资源的消耗,设计了基于模型的动态事件触发机制;通过李雅普诺夫稳定性理论证明了容错控制算法在间歇通信的情况下实现了多智能体系统一致性,且排除了芝诺行为。

关键词：多智能体系统容错控制事件触发控制线性矩阵不等式(LMI) 通讯时滞

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多天线无线充电器的安全布置研究

计算机科学 2024年第8期51卷 345-353页

作者：任美璇邓鹏赵悦汪笑宇王超戴海鹏吴黎兵武汉大学国家网络安全学院武汉430072 计算机软件新技术国家重点实验室(南京大学) 南京210023 苏州大学计算机科学与技术学院江苏苏州215006 郑州大学网络空间安全学院郑州450001

多天线无线充电器的安全布置问题(SPINNER)涉及给定一组无线可充电设备和一组无线充电器,每个充电器都配备了多根有向天线,需确定其功率水平和策略(包括充电器的位置和天线方向),以最大化整体充电效用,并确保目标区域内任意位置均满足... 详细信息

多天线无线充电器的安全布置问题(SPINNER)涉及给定一组无线可充电设备和一组无线充电器,每个充电器都配备了多根有向天线,需确定其功率水平和策略(包括充电器的位置和天线方向),以最大化整体充电效用,并确保目标区域内任意位置均满足电磁辐射安全约束。文中考虑了两种场景,分别是具有给定位置集的多天线无线充电器的安全布置(SPINNER-G)和具有任意点的多天线无线充电器的安全布置(SPINNER-A)。首先,采用分段常数函数近似非线性充电功率函数,并将二维区域划分为有限数量的子区域,使得无限的电磁辐射安全约束减少为有限个。然后,针对SPINNER-G,提出了一种最大覆盖集提取方法,以限制无线充电器的方向。针对SPINNER-A,构造了最大相交情况,以限制充电器的位置和方向。文中提出了两种基于线性规划的贪心方案,分别求解SPINNER-G和SPINNER-A,近似比均为1/2-ε。仿真结果表明,所提算法在充电效用方面相比3种对比算法至少提高了54.2%。

关键词：多天线无线充电器有向充电安全布置充电调度近似算法

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泌尿系统术后留置双J管患者并发尿路感染列线图预测模型建立及验证

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华北理工大学学报（医学版） 2024年第2期26卷 111-116页

作者：吴利兵曹勇庒华厉波李超群日照市中心医院泌尿外科山东日照276800

目的通过建立泌尿系统术后留置双J管患者尿路感染(UTI)临床预测模型,提高临床对于此类患者的诊治能力。方法选择2018年1月~2022年7月本院泌尿外科接受手术留置双J管患者为研究对象,经病历筛选最终入组研究对象共137例,将尿路感染患者纳... 详细信息

目的通过建立泌尿系统术后留置双J管患者尿路感染(UTI)临床预测模型,提高临床对于此类患者的诊治能力。方法选择2018年1月~2022年7月本院泌尿外科接受手术留置双J管患者为研究对象,经病历筛选最终入组研究对象共137例,将尿路感染患者纳入UTI组,未发生尿路感染者纳入非UTI组。对性别、年龄、体质量指数(BMI)、双J管留置时间、合并糖尿病、尿路感染史、术前营养控制状态评分(COUNT)、手术时间、双J管侧别、合并肾功能不全情况进行统计,采用R-studio 4.0.2软件的“RMS”函数包完成多因素Logistic回归模型建立、列线图绘制,模型及单因素对双J管感染的诊断价值分析采用受试者工作特征曲线(ROC)进行评价。结果UTI组与非UTI组性别、年龄、BMI、合并糖尿病、手术时间、双J管侧别、合并肾功能情况比较差异无统计学意义(P>0.05),UTI组双J管留置时间、术前COUNT评分、尿路感染史比例均高于非UTI组(P<0.05);多因素Logistic回归分析结果发现双J管留置时间、尿路感染史、术前COUNT评分均为泌尿系统术后留置双J管相关尿路感染的独立影响因素(P<0.05),Bootstrap法对预测模型列线图进行内部验证,Hosmer-Lemeshow检验结果显示χ2=6.753,P=0.325,说明模型具有良好的校准度;ROC分析结果显示,双J管留置时间、尿路感染史、术前COUNT评分预测术后尿路感染的曲线下面积(AUC)分别为0.793、0.747、0.750,3个单因素联合建立的预测模型预测术后尿路感染的AUC为0.925,均具有良好的预测效能(P<0.05)。结论基于双J管留置时间、尿路感染史、术前COUNT评分所建立的预测模型对泌尿系统术后留置双J管患者尿路感染的发生概率有较好的预测能力,可在早期识别尿路感染高风险人群。

关键词：泌尿系统手术双J管尿路感染预测模型列线图

A certificateless Multi-receiver Encryption scheme based on SM2 signature algorithm

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高置信计算(英文) 2023年第1期3卷 66-74页

作者： Jinglin Zou Debiao He Sheng Bi libing wu Zhe Liu Cong Peng School of Cyber Science and Engineering Wuhan UniversityWuhan 430072China Changjiang River Scientific Research Institute Wuhan 250031China School of Cyber Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The Multi-receiver Encryption(MRE)scheme can meet the secure data transmission requirements in multicast and broadcast *** meet compliance,critical information infrastructure in China should be protected with Chinese national commercial cryptographic *** an MRE scheme based on Elliptic Curve Cryptography(ECC)is one of the current design methods with better flexibility and ***,the research on MRE schemes based on SM2 elliptic curve public-key cryptography is still in a blank *** paper proposes a Certificateless SM2-based Multireceiver Encryption(CL-SM2-MRE)*** prove the security of the CL-SM2-MRE scheme under the Random Oracle Model(ROM)and analyze the performance.

关键词： SM2 Certificateless multireceiver encryption Provable security

Efficient nitrate electroreduction over Mn-doped Cu catalyst via regulating N-containing intermediates adsorption configuration

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Science China Chemistry 2024年第6期67卷 1969-1975页

作者： Limin wu Shunhan Jia libing Zhang Ruhan Wang Jiaqi Feng Xiaofu Sun Buxing Han Beijing National Laboratory for Molecular Sciences CAS Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesCenter for Carbon Neutral ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China College of Chemical Engineering and Environment China University of PetroleumBeijing102249China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai200062China

The electrochemical reduction of NO_(3)^(-)to NH_(3)holds promise for economic and environmental benefits,presenting an energyefficient alternative to the traditional Haber-Bosch ***,challenges exist due to its sluggish kinetics,multiple intermediates,and various reaction *** this study,Mn-doped-Cu catalyst was synthesized and employed for electrochemical NO_(3)^(-)-to-NH_(3)*** doping of Mn into Cu resulted in exceptional performance,achieving a FE of 95.8%and an NH_(3)yield rate of 0.91 mol g^(-1)h^(-1)at-0.6 V in a neutral electrolyte at low NO_(3)^(-)*** experimental studies and theoretical calculations revealed that the Mn dopant enhanced the kinetic rate of NO_(2)~--to-NH_(3)and induced a distinct configuration of**** alteration decreased the energy barrier of*NO-to-*NOH,consequently promoting the conversion of NO_(3)^(-)-to-NH_(3).

关键词： nitrate reduction electrocatalysis ammonia synthesis N-intermediate green chemistry

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Multiscale microstructural consideration of enhanced shear strength in TiAl intermetallic/K4169 alloy composite joints prepared by vacuum brazing with(Ti,Zr)-Ni-based amorphous filler metal

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Journal of Materials Science & Technology 2024年第5期172卷 51-70页

作者： Liangliang Zhang Honggang Dong Peng Li Baosheng wu Yueting Ma libing Huang Chao Li Jiachen Li School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China

TiAl intermetallic could be used to replace Ni-based alloy in assemblies to generate excellent specific strength.A(Ti,Zr)-Ni-based amorphous filler metal Ti_(21.25)Zr_(25)Ni_(25)Cu_(18.75)(at.%)was designed using a cluster-plus-glue-atom model to successfully vacuum braze K4169 and TiAl bimetallic *** various brazing temperatures and holding time,the quantitative relationships between lattice distortion,grain boundary,dislocation density,and hardness,elastic modulus,shear strength of the joints were ***,the fracture mechanism of the joints was *** brazed seam mainly consisted of solid diffusion reaction layers(ZonesⅠandⅢ)and filler metal residue zone(ZoneⅡ).When the brazing temperature increased to 1030℃,grain refinement occurred in the brazed ***Ⅰwas primarily composed of(Ni)ss[0-11]+TiNi[011]/(Cr,Fe,Ni)ss[0-11]/(Ti,Zr)Ni[0-1-1]+(Cr,Fe,Ni)ss[0-11].The(Ti,Zr)(Ni,Cu)[001]and(Ti,Zr)(Ni,Cu)[101]intermetallic compound-based solid solutions were formed in ZoneⅡ.And the lattice distortion of(Ti,Zr)(Ni,Cu)[101]and(Ti,Zr)(Ni,Cu)[001]was 32.05%and 14.82%,*** a result,the proportion of low angle grain boundaries(LAGBs)and deformed grains in ZoneⅡrose to 38.6%and 38.7%.In ZonesⅠandⅢ,the proportion of LAGBs reduced to 8%and 3.4%,*** the holding time increased,the long-range diffusion of Al in ZoneⅡcaused the(Ti,Zr)(Ni,Cu)[001]with cubic structure to transform into(Ti,Zr)(Ni,Cu,Al)[00-1]with hexagonal crystal system structure,where the lattice distortion was 4.42%and 10.49%for a and *** 1030℃/10 min,the average geometrically nec-essary dislocation densities(GNDs)in ZonesⅠ,ⅡandⅢwere 9.87×10^(14)m^(-2),8.55×10^(14)m^(-2)and 11.4×10^(14)m^(-2),***,the shear strength of joints reached 322 MPa due to the lattice distortion,dislocation strengthening and fine grain ***,the plastic and brittle hard phases were generated in ZoneⅡand displayed a mechanical interlocking structure tha

关键词： K4169/Ti_(21.25)Zr_(25)Ni_(25)Cu_(18.75)/TiAl composite joints Intermetallic compound-based solid solution Lattice distortion Elastic modulus

A mobile edge computing-based applications execution framework for Internet of Vehicles

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Frontiers of Computer Science 2022年第5期16卷 131-141页

作者： libing wu Rui ZHANG Qingan LI Chao MA Xiaochuan SHI School of Computer Science Wuhan UniversityWuhan 430000China School of Cyber Science and Engineering Wuhan UniversityWuhan 430000China Shenzhen Research Institute of wuhan University Shenzhen 518052China

Mobile edge computing(MEC)is a promising technology for the Internet of Vehicles,especially in terms of application offloading and resource *** existing offloading schemes are sub-optimal,since these offloading strategies consider an application as a *** comparison,in this paper we propose an application-centric framework and build a finer-grained offloading scheme based on application *** our framework,each application is modelled as a directed acyclic graph,where each node represents a subtask and each edge represents the data flow dependency between a pair of *** vehicles and MEC server within the communication range can be used as candidate offloading ***,the offloading involves assigning these computing nodes to *** addition,the proposed offloading scheme deal with the delay constraint of each *** experimental evaluation show that,compared to existing non-partitioning offloading schemes,this proposed one effectively improves the performance of the application in terms of execution time and throughput.

关键词： mobile edge computing application partition directed acyclic graph offloading Internet of Vehicles

Efficient and Secure Authentication Scheme with Conditional Privacy-Preserving for VANETs

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Chinese Journal of Electronics 2016年第5期25卷 950-956页

作者： XIE Yong wu libing ZHANG Yubo SHEN Jian School of Computer Science Wuhan University School of Information and Engineering Jingdezhen Ceramic Institute State Key Laboratory of Software Engineering Wuhan University School of Computer and Software Nanjing University of Information Science and Technology

The goal of authentication scheme for Vehicular ad hoc networks(VANETs) is to ensure reliability and integrity of message. Due to the timeliness of traffic-related messages and the highly dynamic nature of VANETs, it still is a challenge to solve the three key issues simultaneously, i.e. security, efficiency and conditional privacy-preserving, on the design of authentication scheme for VANETs. To address this challenge, an efficient Conditional privacy-preserving authentication(CPPA) scheme is proposed in this paper. Compared with the most recent proposed CPPA schemes, our proposed scheme markedly decreases the computation costs of the message-signing phase and the message verification phase, while satisfies all security requirements of VANETs and provides conditional privacy-preserving.

关键词： VANETs Authentication scheme Security Conditional privacy-preservation Efficiency