检索结果-南通市图书馆

Cooperative maneuver decision making for multi-UAV air combat based on incomplete information dynamic game

在线全文

学校读者我要写书评

暂无评论

Defence Technology(防务技术) 2023年第9期27卷 308-317页

作者： Zhi Ren Dong Zhang shuo tang Wei Xiong Shu-heng Yang School of Astronautics Northwestern Polytechnical UniversityXi'an710072China Shaanxi Aerospace Flight Vehicle Design Key Laboratory Northwestern Polytechnical UniversityXi'an710072China

Cooperative autonomous air combat of multiple unmanned aerial vehicles(UAVs)is one of the main combat modes in future air warfare,which becomes even more complicated with highly changeable situation and uncertain information of the *** such,this paper presents a cooperative decision-making method based on incomplete information dynamic game to generate maneuver strategies for multiple UAVs in air ***,a cooperative situation assessment model is presented to measure the overall combat ***,an incomplete information dynamic game model is proposed to model the dynamic process of air combat,and a dynamic Bayesian network is designed to infer the tactical intention of the *** a reinforcement learning framework based on multiagent deep deterministic policy gradient is established to obtain the perfect Bayes-Nash equilibrium solution of the air combat game ***,a series of simulations are conducted to verify the effectiveness of the proposed method,and the simulation results show effective synergies and cooperative tactics.

关键词： Cooperative maneuver decision Air combat Incomplete information dynamic game Perfect bayes-nash equilibrium Reinforcement learning

在线全文

学校读者我要写书评

暂无评论

新疆和田花帽实物测绘研究

服装设计师 2024年第2期 33-41页

作者：沈飞吴小军唐硕徐岩单刘艺北京服装学院服装艺术与工程学院

佩戴花帽是维吾尔族人民的重要生活习俗,在日常社交、走亲访友、节日聚会等场合中佩戴花帽,不仅是对民族文化传统的传承,也是对长辈、亲友的尊重,更是民族审美意趣的体现。本研究报告对新疆和田地区所收集的花帽进行数据测量与绘制,剖... 详细信息

佩戴花帽是维吾尔族人民的重要生活习俗,在日常社交、走亲访友、节日聚会等场合中佩戴花帽,不仅是对民族文化传统的传承,也是对长辈、亲友的尊重,更是民族审美意趣的体现。本研究报告对新疆和田地区所收集的花帽进行数据测量与绘制,剖析花帽的制作结构、分析花帽的装饰图案题材、构图与纹样造型,研究花帽的装饰工艺方法,力求通过实物研究对新疆和田花帽进行数据记录与传统手工技艺的分析,在保护民族优秀传统文化的同时,期望为当下设计领域提供参考与借鉴。

关键词：新疆和田花帽测绘

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

新型高增益耦合电感二次型变换器

电力电子技术 2024年第5期58卷 123-125页

作者：李洪珠唐硕张博源宋承航辽宁工程技术大学电气与控制工程学院辽宁葫芦岛125105

将开关-耦合电感单元引入二次型变换器,采用一个耦合电感和两个独立电感,在开关管关断时,电感为电容充电;导通时,利用电容为负载供电。与传统变换器相比,所提出的变换器采用更少的器件,能得到高电压增益效果与低占空比。采用了降低电压... 详细信息

将开关-耦合电感单元引入二次型变换器,采用一个耦合电感和两个独立电感,在开关管关断时,电感为电容充电;导通时,利用电容为负载供电。与传统变换器相比,所提出的变换器采用更少的器件,能得到高电压增益效果与低占空比。采用了降低电压应力的电容,二极管和半导体开关,开关管应力更低。提出了稳态和比较性能分析,制作了一台140W实验平台,给出实验数据与结论,验证了理论分析的正确性。

关键词：二次型变换器耦合电感高增益电压应力

基于AnyLogic的直升机后送救护组医疗设备器材需求模型构建

在线全文

学校读者我要写书评

暂无评论

医疗卫生装备 2024年第5期45卷 28-33页

作者：唐硕李觅贺丽周邦富周亮肖南张治钢陆军军医大学大坪医院野战卫生装备与器材研究室重庆400042 陆军军医大学第一附属医院心血管内科重庆400038

目的:构建直升机后送救护组医疗设备器材需求模型,以为不同任务下合理配备机载医疗设备器材提供参考。方法:收集整理常规医疗处置及紧急医疗处置时间、医疗处置所需的基本医疗设备器材等基础数据,采用AnyLogic的多智能体建模方法,将伤... 详细信息

目的:构建直升机后送救护组医疗设备器材需求模型,以为不同任务下合理配备机载医疗设备器材提供参考。方法:收集整理常规医疗处置及紧急医疗处置时间、医疗处置所需的基本医疗设备器材等基础数据,采用AnyLogic的多智能体建模方法,将伤病员、设备器材、医护作为智能体模块,通过彼此间的逻辑关系建立智能体之间的访问规则,从而构建直升机后送救护组医疗设备器材需求模型。以直8加改装救护直升机为平台装载救护组和伤病员为例,模拟多种轻重伤病员混合的后送任务,采用该模型记录100次模拟飞行的医疗处置等待时间、完成率、医护利用率和设备器材需求数据,并进行分析。结果:采用该模型可从电子设备类、救护操作器材类、辅助小器材类、卫生耗材类等方面为直升机后送救护组的多种后送任务提供通用的医疗设备器材配备方案。结论:该模型为直升机后送救护组医疗设备器材的合理配备提供了新思路和参考依据。

关键词：直升机后送 AnyLogic 医疗设备器材需求模型多智能体建模

Analysis of optimal initial glide conditions for hypersonic glide vehicles

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2014年第2期27卷 217-225页

作者： Yan Xiaodong Lyu Shi tang shuo School of Astronautics Northwestern Polytechnical University Science and Technology on Aerospace Flight Dynamics Laboratory

Hypersonic glide vehicles （HGVs） are launched by a solid booster and glide through the atmosphere at high speeds. HGVs will be important means for rapid long-range delivery in the future. Given that the glide is unpowered, the initial glide conditions （IGCs） are crucial for flight. This paper aims to find the optimal IGCs to improve the maneuverability and decrease the con- straints of HGVs. By considering the IGCs as experiment factors, we design an orthogonal table with three factors that have five levels each by using the orthogonal experimental design method. Thereafter, we apply the Gauss pseudospectral method to perform glide trajectory optimization by using each test of the orthogonal table as the initial condition. Based on the analytic hierarchy process, an integrated indicator is established to evaluate the IGCs, which synthesizes the indexes of the maneuverability and constraints. The integrated indicator is calculated from the trajectory opti- mization results. Finally, optimal IGCs and valuable conclusions are obtained by using range anal- ysis, variance analysis, and regression analysis on the integrated indicator.

关键词： Analytic hierarchy process Hypersonic glide vehicles Optimization Orthogonat experimentaldesign Trajectory

Flight control for air-breathing hypersonic vehicles using linear quadratic regulator design based on stochastic robustness analysis

在线全文

学校读者我要写书评

暂无评论

信息与电子工程前沿：英文版 2017年第7期18卷 882-897页

作者： Lin CAO shuo tang Dong ZHANG College of Astronautics Northwestern Polytechnical University Xi 'an 710072 China Shaanxi Aerospace Flight Vehicle Design Key Laboratory Xi 'an 710072 China

吸气式高超声速飞行器(air-breathing hypersonic vehicle,AHV)的飞行动力学模型具有高度非线性与多变量耦合等特性,且受到内部不确定性与外部干扰的综合影响,因此需要具有强鲁棒性与高精度的控制器。本文介绍了一种改进的基于随机鲁棒... 详细信息

吸气式高超声速飞行器(air-breathing hypersonic vehicle,AHV)的飞行动力学模型具有高度非线性与多变量耦合等特性,且受到内部不确定性与外部干扰的综合影响,因此需要具有强鲁棒性与高精度的控制器。本文介绍了一种改进的基于随机鲁棒性分析的线性二次调节器(linear-quadratic regulator,LQR)设计方法,用于AHV的纵向飞行控制器设计。首先,应用输入输出反馈线性化技术设计LQR控制器。其次,基于系统参数的不确定性,将系统鲁棒性表征为满足稳定性与设计指标要求的概率,并构建系统鲁棒性与LQR参数之间的映射关系。为了实现系统鲁棒性最大化的目标,提出一种全新的混合粒子群优化算法对LQR的控制参数进行寻优计算。在优化迭代的过程中,使用切诺夫边界理论确定蒙特卡洛估计的随机样本量。最后,仿真结果表明该优化算法可以高效地获取满足设计要求的LQR控制参数最优解。

关键词：吸气式高超声速飞行器随机鲁棒性分析二次线性调节器粒子群优化改进混合粒子群算法

奶酪中氨基甲酸乙酯含量GC-MS/MS检测预处理条件优化

在线全文

学校读者我要写书评

暂无评论

中国酿造 2024年第4期43卷 253-257页

作者：梁建英唐烁刘丽君谢瑞龙高玉杰胡雪李翠枝吕志勇内蒙古伊利实业集团股份有限公司内蒙古呼和浩特010110 国家市场监管重点实验室(乳及乳制品检测与监控技术) 上海200127

该研究建立气相色谱-三重四级杆串联质谱(GC-MS/MS)法测定奶酪中氨基甲酸乙酯含量的外标定量检测方法,对样品预处理条件进行优化,并对该检测方法进行方法学考察。结果表明,最佳前处理条件为在样品中加2 mL去离子水混匀,加入1 mL乙腈提取... 详细信息

该研究建立气相色谱-三重四级杆串联质谱(GC-MS/MS)法测定奶酪中氨基甲酸乙酯含量的外标定量检测方法,对样品预处理条件进行优化,并对该检测方法进行方法学考察。结果表明,最佳前处理条件为在样品中加2 mL去离子水混匀,加入1 mL乙腈提取,于0℃、转速6000 r/min条件下离心8 min,上清液采用碱性硅藻土固相萃取柱(2 g/10 mL)净化,正己烷淋洗,20 mL二氯甲烷洗脱,对洗脱液氮吹至约0.5 mL,甲醇定容后GC-MS/MS检测,外标法定量。该检测方法在5~200 ng/mL质量浓度范围内线性关系良好,相关系数R2>0.99。定量限为0.01 mg/kg,检出限为0.005 mg/kg,在高中低三个添加水平的加标回收率试验中,回收率为69.1%~90.7%,精密度试验结果的相对标准偏差(RSDs)为4.2%~11.1%。该方法便于操作,检测结果准确,适用于奶酪中氨基甲酸乙酯含量的测定。

关键词：奶酪氨基甲酸乙酯气相色谱-三重四级杆串联质谱法预处理条件优化

Data Recovery Based on Intelligent Pattern Matching

在线全文

学校读者我要写书评

暂无评论

China Communications 2010年第6期7卷 107-111页

作者： Yi Junkai tang shuo Li Hui Beijing University of Chemical Technology Beijing 10029 P. R. China

To solve the problem of data recovery on free disk sectors, an approach of data recovering based on intelligent pattern matching is proposed in this paper. Different from the methods based on the file directory, this approach utilizes the consistency among the data on the disk. A feature pattern library is established based on different types of files according to the internal constructions of text. Data on sectors will be classified automatically by data clustering and evaluating. When the conflict happens on data classification, the digestion will be initiated by adopting context pattern. Based on this approach, the paper achieved the data recovery system aiming at pattern matching of txt, word and PDF files. Raw and formatting recovery tests proved that the system works well.

关键词：模式匹配数据恢复智能磁盘扇区文件目录内部结构背景图案 Word

Effects of long-term partial substitution of inorganic fertilizer with pig manure and/or straw on nitrogen fractions and microbiological properties in greenhouse vegetable soils

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第6期23卷 2083-2098页

作者： shuo Yuan Ruonan Li Yinjie Zhang Hao'an Luan Jiwei tang Liying Wang Hongjie Ji Shaowen Huang State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China/Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China Institute of Agricultural Resources and Environment Hebei Academy of Agriculture and Forestry SciencesShijiazhuang 050051China College of Resources and Environment Henan Agricultural UniversityZhengzhou 450002China College of Forestry Hebei Agricultural UniversityBaoding 071000China

Partial substitution of inorganic fertilizers with organic amendments is an important agricultural management *** 11-year field experiment(22 cropping periods)was carried out to analyze the impacts of different partial substitution treatments on crop yields and the transformation of nitrogen fractions in greenhouse vegetable *** treatments with equal N,P_(2)O_(5),and K_(2)O inputs were selected,including complete inorganic fertilizer N(CN),50%inorganic fertilizer N plus 50%pig manure N(CPN),50%inorganic fertilizer N plus 25%pig manure N and 25%corn straw N(CPSN),and 50%inorganic fertilizer N plus 50%corn straw N(CSN).Organic substitution treatments tended to increase crop yields since the 6th cropping period compared to the CN *** the 8th to the 22nd cropping periods,the highest yields were observed in the CPSN treatment where yields were 7.5-11.1%greater than in CN *** 11-year fertilization,compared to CN,organic substitution treatments significantly increased the concentrations of NO_(3)^(-)-N,NH_(4)^(+)-N,acid hydrolysis ammonium-N(AHAN),amino acid-N(AAN),amino sugar-N(ASN),and acid hydrolysis unknown-N(AHUN)in soil by 45.0-69.4,32.8-58.1,49.3-66.6,62.0-69.5,34.5-100.3,and 109.2-172.9%,*** analysis indicated that soil C/N and OC concentration significantly affected the distribution of N *** highest concentrations of NO_(3)^(-)-N,AHAN,AAN,AHUN were found in the CPSN *** substitution treatments increased the activities ofβ-glucosidase,β-cellobiosidase,N-acetyl-glucosamidase,L-aminopeptidase,and phosphatase in the *** substitution treatments reduced vector length and increased vector angle,indicating alleviation of constraints of C and N on soil *** substitution treatments increased the total concentrations of phospholipid fatty acids(PLFAs)in the soil by 109.9-205.3%,and increased the relative abundance of G^(+)bacteria and fungi taxa,but decreased the relat

关键词： organic substitution management greenhouse vegetable production N fractions microbial community composition extracellular enzyme activity enzyme stoichiometry coefficients