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Development cost prediction of general aviation aircraft projects with parametric modeling

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Chinese Journal of Aeronautics 2019年第6期32卷 1465-1471页

作者： Xiaonan CHEN Jun HUANG mingxu yi School of Aeronautic Science and Technology Beihang University

The study of the development cost of general aviation aircraft is limited by small samples with many cost-driven factors. This paper investigates a parametric modeling method for prediction of the development cost of general aviation aircraft. The proposed technique depends on some principal components, acquired by utilizing P value analysis and gray correlation analysis. According to these principal components, the corresponding linear regression and BP neural network models are established respectively. The feasibility and accuracy of the P value analysis are verified by comparing results of model fitting and prediction. A sensitivity analysis related to model precision and suitability is discussed in detail. Results obtained in this study show that the proposed method not only has a certain degree of versatility, but also provides a preliminary prediction of the development cost of general aviation aircraft.

关键词： BP neural network Development cost General aviation aircraft Gray correlation analysis Linear regression P value analysis Parametric modeling Preliminary prediction Sensitivity analysis

Acoustic Scattering Performance for Sources in Arbitrary Motion

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Computer Modeling in Engineering & Sciences 2017年第1期113卷 89-108页

作者： Yunpeng Ma Lifeng Wang mingxu yi School of Aeronautic Science and Technology Beihang UniversityBeijingChina

In this paper,an analytical time domain formulation based on Ffowcs Williams-Hawkings(FW-H)equation is derived for the prediction of the acoustic velocity field generated by moving *** provides the imposition of the Neumann boundary condition on a rigid scattering *** order to calculate the scattering sound pressure of the duct,a thin-body boundary element method(BEM)has been *** radiate sound pressure is calculated using the acoustic analogy FW-H *** scattering effect of the duct wall on the propagation of the sound wave is presented using the thin-body *** results for a pulsating sphere,dipole source,and a tail rotor verify the *** sound pressure directivity and scattering effect are shown to demonstrate the applicability and validity of the approach.

关键词： Scattering performance Ffowcs Williams-Hawkings equation acoustic velocity boundary element method

Efficient Security Sequencing Problem over Insecure Channel Based on Homomorphic Encryption

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China Communications 2016年第9期13卷 195-202页

作者： mingxu yi Lifeng Wang Yunpeng Ma School of Aeronautic Science and Engineering Beihang University

In the field of sequencing of secret number,an important problem is how to establish an efficient and secure protocol for sorting the secret *** a powerful tool in solving privacy sequencing problems,secure multipart computation is more and more popular in anonymous voting and online *** the present study,related secure computation protocol for sequencing problem is not many by *** order to improve the efficiency and safety,we propose a security sequencing protocol based on homomorphic *** also give analysis of correctness and security to highlight its feasibility.

关键词： homomorphic encryption privacy sequencing problem secure multipart compu- tation information transformation

Linear random search and engineering estimation of sinkage for launching carrier aircraft

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Science China(Technological Sciences) 2019年第6期62卷 996-1002页

作者： ZHONG Guo HUANG Jun ZHOU ZeYang yi mingxu School of Aeronautic Science and Engineering Beijing University of Aeronautics and Astronautics

A linear random search algorithm(LRSA) is developed to determine the critical value of takeoff weight limited to the safe flight track sinkage and an engineering estimation method(EEM) is proposed to calculate the sinkage of carrier aircraft launch in real time. Based on the analysis of free flight after leaving the carrier, the equations are established to participate into engineering estimation of flight track sinkage. Thanks to the proposed search algorithm, the maximum takeoff weight of carrier aircraft with safe catapult launch flight track sinkage is generated in few steps. The results of sinkage estimation and the search algorithm are in good agreement with that of aircraft catapult launch simulation. The main contribution of this manuscript is the establishment of simple and accurate engineering estimation for carrier aircraft launch flight track sinkage and the development of robust and efficient search algorithm for the critical value with safe catapult criteria.

关键词： carrier aircraft launch flight track sinkage engineering estimation linear random search simulation

Guidelines for application of high-content screening in traditional Chinese medicine:concept,equipment,and troubleshooting

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Acupuncture and Herbal Medicine 2024年第1期4卷 1-15页

作者： Xuechun Chen Lu Li mingxu Zhang Jian Yang ChunMing Lyu yizhou Xu Yang Yang yi Wang Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang UniversityHangzhouChina Department of Cardiology Hangzhou First People’s HospitalHangzhouChina National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxingChina Molecular Devices Shanghai Corporation ShanghaiChina National Key Laboratory of Chinese Medicine Modernization Tianjin University of Traditional Chinese MedicineTianjinChina Science and Technology Experiment Center Shanghai University of Traditional Chinese MedicineShanghaiChina Engineering Research Center of Innovative Anticancer Drugs Ministry of Educationhangzhou China

High-content screening(HCS)technology combines automated high-speed imaging hardware and single-cell quantitative *** can greatly accelerate data acquisition in cellular fluorescence imaging and is a powerful research technique in traditional Chinese medicine(TCM).An increasing number of laboratories and platforms,including TCM laboratories,have begun utilizing HCS ***,this technology is still in its infancy in TCM research and there is a lack of sufficient experience with the associated concepts,instrument configurations,and analysis *** improve the understanding of HCS among researchers in the field of TCM,this paper summarizes the concept of HCS,software and hardware configuration,the overall research process,as well as common problems and related solutions of HCS in TCM research based on our team’s previous research experience,providing several research examples and an outlook on future perspectives,aiming to provide a technical guide for HCS in TCM research.

关键词： High-content imaging High-content screening Traditional Chinese medicine

D-band 4600 m wireless transmission with rates exceeding 100 Gbit/s based on photonics aided technologies

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Science China(Technological Sciences) 2024年第9期67卷 2968-2970页

作者： ZHAO XianMing YU JianJun YANG XiongWei WEI yi LI WeiPing TAN JingWen WANG mingxu ZHANG QiuTong ZHANG Bing BIAN ChengZhen TIAN Peng HAN Yang ZHANG Qingyi YU JianGuo ZHAO Feng Harbin Institute of Technology Harbin 150001China Key Laboratory for Information Science of Electromagnetic Waves Fudan UniversityShanghai 200433China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Automation Xi’an University of Posts and TelecommunicationsXi’an 710121China

With the rise of emerging applications such as artificial intelligence(AI),virtual reality(VR), and short videos, the number of Internet terminals has increased dramatically [1]. According to the Cisco Annual Traffic Survey Report, annual traffic is growing at a compound annual growth rate of 20%[2]. To meet exploding growth in traffic demands, researchers have turned their attention to license-free high-band millimeter wave(MMW), such as W-band(75–110 GHz), D-band(110–170 GHz), and terahertz band(THz) [3,4].

关键词： millimeter exceeding artificial

Legendre小波求解非线性分数阶Fredholm积分微分方程

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辽宁工程技术大学学报（自然科学版） 2012年第3期31卷 405-408页

作者：尹建华任建娅仪明旭河北民族师范学院数学与计算机系河北承德067000 燕山大学理学院河北秦皇岛066004

为了求解非线性分数阶Fredholm积分微分方程的数值解,通过Legendre多项式,得出了Legendre小波,并由block pulse函数给出了Legendre小波的分数阶积分算子矩阵,利用block pulse函数与Legendre小波的积分算子矩阵的性质将非线性分数阶Fredh... 详细信息

为了求解非线性分数阶Fredholm积分微分方程的数值解,通过Legendre多项式,得出了Legendre小波,并由block pulse函数给出了Legendre小波的分数阶积分算子矩阵,利用block pulse函数与Legendre小波的积分算子矩阵的性质将非线性分数阶Fredholm积分微分方程转化为非线性代数方程组,进而可以求得原积分微分方程的数值解.结果表明:随着点数的增多,数值解的精度也越来越高.文中给出的算例表明了该方法的可行性和有效性.

关键词： Legendre多项式 Legendre小波 Fredholm积分微分方程非线性 block pulse函数算子矩阵分数阶微分数值解

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Legendre小波求解超奇异积分

计算数学 2012年第2期34卷 195-202页

作者：陈一鸣仪明旭魏金侠陈娟燕山大学理学院河北秦皇岛066004

超奇异积分的数值算法一直是近些年来研究的重要课题.基于超奇异积分的Hadamard有限部分积分定义,本文给出了利用Legendre小波计算超奇异积分的方法.当奇异点位于区间内时,由于Legendre小波具有很好的正交性、显式表达式以及小波函数的... 详细信息

超奇异积分的数值算法一直是近些年来研究的重要课题.基于超奇异积分的Hadamard有限部分积分定义,本文给出了利用Legendre小波计算超奇异积分的方法.当奇异点位于区间内时,由于Legendre小波具有很好的正交性、显式表达式以及小波函数的可计算性,将区间内的奇异点变换到区间端点处,再利用区间端点处Hadamard有限部分积分的定义,进而可以计算p+1(p∈N^+)阶超奇异积分.文中最后给出的算例表明了该方法的可行性和有效性.

关键词：超奇异积分 Legendre小波 Hadamard有限部分积分近似值

面向多源协调互济的AGC指令两阶段分配方法

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电力系统保护与控制 2024年第14期52卷 71-81页

作者：雷雨向明旭黄子蒙许懿杨知方国网重庆市电力公司重庆400015 输变电装备技术全国重点实验室(重庆大学) 重庆400044

高比例新能源电力系统的惯量支撑能力弱、随机波动性强,电网频率质量难以得到保障。引入不同品类调频资源共同参与自动发电控制(automatic generation control,AGC)是应对上述问题的有效手段,但这也要求AGC指令分配能够适配不同品类资... 详细信息

高比例新能源电力系统的惯量支撑能力弱、随机波动性强,电网频率质量难以得到保障。引入不同品类调频资源共同参与自动发电控制(automatic generation control,AGC)是应对上述问题的有效手段,但这也要求AGC指令分配能够适配不同品类资源的差异化调节特性。对此,提出面向多源协调互济的AGC指令两阶段分配方法。首先,将不同资源分别安排至与自身调节特性相匹配的超前分配阶段和实时分配阶段。其次,在实时分配阶段提出基于资源调节优先级的AGC指令分配策略,根据不同品类资源的调节特性以及电网频率状况对资源调节优先级进行设定,以互补利用各类资源的调节优势。然后,在超前分配阶段,建立优化分配模型以实现不同品类资源的协调最优利用。同时,嵌入与资源剩余调节裕度相关的惩罚项,以保障资源持续调节能力。最后,基于电网实际数据的算例仿真验证了所提方法的有效性。

关键词：自动发电控制指令分配多源协调互济持续调节能力