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Equivalent sample theory of networked control systems and its application

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Journal of Systems Engineering and Electronics 2008年第6期19卷 1199-1202页

作者： Ji Shunping Lu Yuping Wang shipeng Coll. of Automation Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China Sanjiang Univ. Nanjing 210012 P. R. China

The equivalent sample theory and its application in analysis of networked control system （NCS） are presented. After analyzing NCS＇s scheduling in master-slave mode, the characteristics of time delay and sample are summarized. Looking on master station visiting the slave station as a special sample process, the theory of equivalent sample is presented. And based on it, the stability of a kind of NCS is analyzed. The criterion to determine the upper bound of transmission delay is introduced, which guarantees the stability. Finally, an example with simulation shows the availability and usability of this analysis method.

关键词： networked control system equivalent sample theory stability

Gene mutations and clinical phenotypes in Chinese children with Blau syndrome

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Science China(Life Sciences) 2017年第7期60卷 758-762页

作者： Caifeng Li Junmei Zhang shipeng Li Tongxin Han Weiying Kuang Yifang zhou Jianghong Deng Xiaohua Tan Department of Rheumatology and Immunology Beijing Children's Hospital Capital Medical University National Center for Children's Health Beijing 100045 China

The mutations of CARD15 gene and clinical features of Chinese patients with Blau syndrome were analyzed. We identified10 missense mutations, out of which five were new: R334 L, E383 D, R471 C, C495 R and D512 F. The rest of them, R334 W,R334Q, G481 D, M513 T and R587 C, have been reported previously. Among all the mutations, R334 W, R334 Q and C495 R had the highest frequency. Blau syndrome was found at early age after birth. It began with lepidic rash and symmetric polyarthritis and was phenotypically characterized by typical rash, arthritis, iridocyclitis and arteritis. Cardiac involvement was also found in Blau syndrome. In addition to nerve deafness, renal involvement, osteochondroma and central nervous system involvement were also found in our patients. Therefore, Chinese children with Blau syndrome have unique gene mutations and complicated clinical phenotypes. Pathologic examination and CARD15 mutation testing should be considered for diagnosis as early as possible for suspected patients.

关键词： Blau syndrome genetic mutation clinical phenotype

On the error bounds of nonconforming finite elements

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Science China Mathematics 2010年第11期53卷 2917-2926页

作者： MAO shipeng SHI ZhongCi The State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering ComputingAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China

We prove that the error estimates of a large class of nonconforming finite elements are dominated by their approximation errors, which means that the well-known Cea’s lemma is still valid for these nonconforming finite element methods. Furthermore, we derive the error estimates in both energy and L2 norms under the regularity assumption u ∈ H1+s(Ω) with any s > 0. The extensions to other related problems are possible.

关键词： nonconforming finite elements Cea’s lemma error estimates

Mechanical design and analysis of a novel variable stiffness actuator with symmetrical pivot adjustment

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Frontiers of Mechanical Engineering 2021年第4期16卷 711-725页

作者： Yiwei LIU shipeng CUI Yongjun SUN State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

The safety of human-robot interaction is an essential requirement for designing collaborative ***,this paper aims to design a novel variable stiffiiess actuator(VSA)that can provide safer physical human-robot interaction for collaborative *** A follows the idea of modular design,mainly including a variable stiffiiess module and a drive *** variable stiffiiess module transmits the motion from the drive module in a roundabout maimer,making the modularization of VS A *** the key component of the variable stiffiiess module,a stiffness adjustment mechanism with a symmetrical structure is applied to change the positions of a pair of pivots in two levers linearly and simultaneously,which can eliminate the additional bending moment caused by the asymmetric *** design of the doubledeck grooves in the lever allows the pivot to move freely in the groove,avoiding the geometric constraint between the ***,the VSA stiffiiess can change from zero to infinity as the pivot moves from one end of the groove to the *** facilitate building a manipulator in the future,an expandable electrical system with a distributed structure is also *** calibration and control experiments are performed to evaluate the physical performance of the designed *** results show that the VSA stiffiiess is close to the theoretical design ***,the VSA with a proportional-derivative feedback plus feedforward controller exhibits a fast response for stiffiiess regulation and a good performance for position tracking.

关键词： variable stiffiiess actuator variable stiffness module drive module symmetrical structure doubledeck grooves expandable electrical system

Quick identification of guidance law for an incoming missile using multiple-model mechanism

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Chinese Journal of Aeronautics 2022年第9期35卷 282-292页

作者： Yinhan WANG shipeng FAN Jiang WANG Guang WU School of Aerospace Engineers Beijing Institute of TechnologyBeijing 10081China Beijing Aerospace Automatic Institute Beijing 100854China

A guidance law parameter identification model based on Gated Recurrent Unit(GRU)neural network is established. The scenario of the model is that an incoming missile(called missile)attacks a target aircraft(called aircraft) using Proportional Navigation(PN) guidance law. The parameter identification is viewed as a regression problem in this paper rather than a classification problem, which means the assumption that the parameter is in a finite set of possible results is discarded. To increase the training speed of the neural network and obtain the nonlinear mapping relationship between kinematic information and the guidance law parameter of the incoming missile, an output processing method called Multiple-Model Mechanism(MMM) is proposed. Compared with a conventional GRU neural network, the model established in this paper can deal with data of any length through an encoding layer in front of the input layer. The effectiveness of the proposed Multiple-Model Mechanism and the performance of the guidance law parameter identification model are demonstrated using numerical simulation.

关键词： Gated recurrent unit Multiple-model mechanism Neural networks Parameter identification Regression models

CONVERGENCE AND SUPERCONVERGENCE ANALYSIS OF LAGRANGE RECTANGULAR ELEMENTS WITH ANY ORDER ON ARBITRARY RECTANGULAR MESHES

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Journal of Computational Mathematics 2014年第2期32卷 169-182页

作者： Mingxia Li Xiaofei Guan shipeng Mao School of Science China University of Geosciences (Beijing) Beijing 100083 China Department of Mathematics Tongji University Shanghai 200092 China LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

This paper is to study the convergence and superconvergence of rectangular finite elements under anisotropic meshes. By using of the orthogonal expansion method, an anisotropic Lagrange interpolation is presented. The family of Lagrange rectangular elements with all the possible shape function spaces are considered, which cover the Intermediate families, Tensor-product families and Serendipity families. It is shown that the anisotropic interpolation error estimates hold for any order Sobolev norm. We extend the convergence and superconvergence result of rectangular finite elements to arbitrary rectangular meshes in a unified way.

关键词： Lagrange interpolation Anisotropic error bounds Arbitrary rectangular meshes,Orthogonal expansion Superconvergence.

试析“中华文明探源工程”重要成果融入高校思政课教学

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西部学刊 2024年第6期 89-92页

作者：胡腾允李士鹏河南科技学院马克思主义学院新乡453003 河南科技学院音乐与舞蹈学院新乡453003

将“中华文明探源工程”重要成果融入高校思政课教学,把思政课堂打造成传播中华文明的主阵地,旨在提升中华文明的影响深度和广度。首先对“中华文明探源工程”及其重要研究成果进行概述;其次从时代要求、思政课创新、对大学生进行思想... 详细信息

将“中华文明探源工程”重要成果融入高校思政课教学,把思政课堂打造成传播中华文明的主阵地,旨在提升中华文明的影响深度和广度。首先对“中华文明探源工程”及其重要研究成果进行概述;其次从时代要求、思政课创新、对大学生进行思想引导等三个方面阐述融入的必要性;最后从教材内容、教学方式、网络育人平台、实践教学等多角度对其融入的举措尝试探析。以期学生充分了解中华民族的过去,自觉传播中华文明,坚定文化自信。

关键词：中华文明探源工程高校思政课教学传播中华文明文化自信以史育人

EXPLICIT ERROR ESTIMATES FOR MIXED AND NONCONFORMING FINITE ELEMENTS

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Journal of Computational Mathematics 2009年第4期27卷 425-440页

作者： shipeng Mao Zhong-ci Shi LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

In this paper, we study the explicit expressions of the constants in the error estimates of the lowest order mixed and nonconforming finite element methods. We start with an explicit relation between the error constant of the lowest order Raviart-Thomas interpolation error and the geometric characters of the triangle. This gives an explicit error constant of the lowest order mixed finite element method. Furthermore, similar results can be ex- tended to the nonconforming P1 scheme based on its close connection with the lowest order Raviart-Thomas method. Meanwhile, such explicit a priori error estimates can be used as computable error bounds, which are also consistent with the maximal angle condition for the optimal error estimates of mixed and nonconforming finite element methods.

关键词： Mixed finite element Nonconforming finite element Explicit error estimate,Maximal angle condition.

2023年全国游泳冠军赛男子50m蛙泳技术特征分析

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体育科学研究 2024年第3期28卷 78-86页

作者：张明飞邓世鹏集美大学体育学院福建厦门361021

蛙泳作为我国竞技游泳的传统优势项目一直备受关注。为进一步帮助运动员优化技术与提升成绩,对全国游泳冠军赛男子50m蛙泳运动员的技术特征进行研究。运用文献资料、视频解析、数理统计、案例分析等研究方法,分析和阐释我国高水平男子50... 详细信息

蛙泳作为我国竞技游泳的传统优势项目一直备受关注。为进一步帮助运动员优化技术与提升成绩,对全国游泳冠军赛男子50m蛙泳运动员的技术特征进行研究。运用文献资料、视频解析、数理统计、案例分析等研究方法,分析和阐释我国高水平男子50m蛙泳运动员的技术特征。结论:(1)冠军孙佳俊同国内选手相比,各个分段的用时与游速皆领先,但主要是凭借卓越的出发技术和破水衔接能力夺得冠军。(2)孙佳俊和覃海洋同亚当·皮蒂相比,在出发15m时间、划水次数与游速上差距悬殊。(3)国内选手奖牌组与非奖牌组相比,在出发反应时、出水距离、划次、划幅与划频上并无显著性差异,但在出发15m时间、途中游时间、冲刺5m时间和游速上具备显著性差异。

关键词：蛙泳竞技游泳蛙泳技术特征