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Journal of Systems Engineering and Electronics 2021年第5期32卷 1212-1220页

作者： YOU Yang JIN guang PAN Zhengqiang guo Rui College of Systems Engineering National University of Defense TechnologyChangsha 410073China Institute of Systems Engineering Academy of Military SciencesBeijing 102300China

Iterated local search(ILS)is used to construct the optimal experimental designs for multi-dimensional constrained spaces,in which the inner loop is based on the stochastic coordinate-exchange(SCE)*** time a local optimal solution is found by the SCE algorithm,the perturbation operator is applied to it,and then a new solution is explored in the areas where the exchange of coordinates may produce improvement,so as to retain the features and attributes of the current optimal solution and avoid the defects of random *** implement the iterated local coordinate-exchange algorithm for experimental designs in the multi-dimensional constrained *** addition,sensitivity analysis was conducted to analyze the impacts of the parameters on the performance of the proposed *** we compared the performance of the proposed algorithm to the SCE algorithm using the random restart *** analysis shows that the proposed algorithm is better than the SCE algorithm in terms of efficiency and quality,especially in the experimental designs for high-dimensional constrained space.

关键词： constrained space experimental design coordinate-exchange iterated local search(ILS)

Long non-coding RNAs play an important role in regulating photoperiod-and temperature-sensitive male sterility in rice

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Science China(Life Sciences) 2017年第4期60卷 443-444页

作者： Jingxin guo Yao-guang Liu State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Key Laboratory of Plant Functtonal Genomicsand Biotechnology of Guangdong Provincial Higher Education Institutions College of Life Sciences South China Agricultural University Guangzhou 510642 China

Rice(Oryza sativa L.)is a major food crop for more than half of the world’s ***,increasing rice production is of great *** successful development of hybrid rice in the 1970s was an important achievement for increasing yield potential,since hybrid rice varieties produce higher yields than inbred varieties(Cheng et al.,2007).In plants,male sterility refers to the inability of producing dehiscent anthers and functional pollen(Chen and Liu,2014).

关键词： sterility inbred pollen alleles inability producing recessive fertility regulating sterile

Markov Jump Processes in Estimating Sharing of Identity by Descent

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Acta Mathematicae Applicatae Sinica 2021年第1期37卷 183-191页

作者： xian CHEN Wei guo Xu-min NI School of Mathematical Sciences Xiamen UniversityXiamen 361005China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China Department of Mathematics Beijing Jiaotong UniversityBeijing 100044China

Identity by descent(IBD)sharing is a very important genomic feature in population genetics which can be used to reconstruct recent demographic *** this paper we provide a framework to estimate IBD sharing for a demographic model called two-population model with *** adopt the structured coalescent theory and use a continuous-time Markov jump process{X(t),t≥0}to describe the genealogical process in such *** we apply Kolmogorov backward equation to calculate the distribution of coalescence time and develop a formula for estimating the IBD *** simulation studies show that our method to estimate IBD sharing for this demographic model is robust and accurate.

关键词： IBD sharing structured coalescent theory Markov jump process Kolmogorov backward equation

Sliding mode tracking control for miniature unmanned helicopters

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Chinese Journal of Aeronautics 2015年第1期28卷 277-284页

作者： xian Bin guo Jianchuan Zhang Yao Zhao Bo The Institute of Robotics and Autonomous System Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical Engineering and Automation Tianjin University

A sliding mode control design for a miniature unmanned helicopter is presented. The control objective is to let the helicopter track some predefined velocity and yaw trajectories. A new sliding mode control design method is developed based on a linearized dynamic model. In order to facilitate the control design, the helicopter＇s dynamic model is divided into two subsystems,such as the longitudinal-lateral and the heading-heave subsystem. The proposed controller employs sliding mode control technique to compensate for the immeasurable flapping angles＇ dynamic effects and external disturbances. The global asymptotic stability（GAS） of the closed-loop system is proved by the Lyapunov based stability analysis. Numerical simulations demonstrate that the proposed controller can achieve superior tracking performance compared with the proportionalintegral-derivative（PID） and linear-quadratic regulator（LQR） cascaded controller in the presence of wind gust disturbances.

关键词： unmanned sliding miniature compensate quadratic cascaded subsystem disturbance facilitate linearized

Progressive Furniture Model Decimation with Texture Preservation

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Journal of Computer Science & Technology 2019年第6期34卷 1258-1268页

作者： Zhi-guang Pan Chu-Hua xian Shuo Jin Gui-Qing Li School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China BlueFire AI CentralHong KongChina

In digital furniture design, skillful designers usually use professional software to create new furniture designs with various textures and then take advantage of rendering tools to produce eye-catching design results. Generally, a fine-grained furniture model holds many geometric details, inducing significant time cost to model rendering and large data size for storage that are not desired in application scenarios where efficiency is greatly emphasized. To accelerate the rendering process while keeping good rendering results as many as possible, we develop a novel decimation technique which not only reduces the number of faces on furniture models, but also retains their geometric and texture features. Two metrics are utilized in our approach to measure the distortion of texture features. Considering these two metrics as guidance for decimation, high texture distortion can be avoided in simplifying the geometric models. Therefore, we are able to build multi-level representations with different detail levels based on the initial design. Our experimental results show that the developed technique can achieve excellent visual effects on the decimated furniture model.

关键词： furniture design model decimation texture preservation progressive representation

Dynamical output feedback stabilization for neutral systems with mixed delays

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第8期9卷 1043-1049页

作者： Wei QIAN guo-jiang SHEN You-xian SUN State Key Lab of Industrtal Control Technology Zhejiang University Hangzhou 310027 China Department of Computer Science and Technology Henan Polytechnic University Jiaozuo 454000 China

This paper is concerned with the issue of stabilization for the linear neutral systems with mixed delays. The attention is focused on the design of output feedback controllers which guarantee the asymptotical stability of the closed-loop systems. Based on the model transformation of neutral type, the Lyapunov-Krasovskii functional method is employed to establish the delay-dependent stability criterion. Then, through the controller parameterization and some matrix transformation techniques, the desired parameters are determined under the delay-dependent design condition in terms of linear matrix inequalities (LMIs), and the desired controller is explicitly formulated. A numerical example is given to illustrate the effectiveness of the proposed method.

关键词： Neutral systems Mixed delays Output feedback stabilization Linear matrix inequality (LMI)

Molecular Control of Male Reproductive Development and Pollen Fertility in Rice

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Journal of Integrative Plant Biology 2012年第12期54卷 967-978页

作者： Jing-Xin guo Yao-guang Liu State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources College of Life SciencesSouth China Agricultural University

Anther development and male fertility are essential biological pro- cesses for flowering plants and are important for crop seed produc- tion. Genetic manipulation of male fertility/sterility is critical for crop hybrid breeding. Rice （Oryza sativa L.） male sterility phenotypes, including genic male sterility, hybrid male sterility, and cytoplasmic male sterility, are generally caused by mutations of fertility-related genes, by incompatible interactions between divergent allelic or non-allelic genes, or by genetic incompatibilities between cytoplas-mic and nuclear genomes. Here, we review the recent advances in the molecular basis of anther development and male fertility-sterility conversion in specific genetic backgrounds, and the interactions with certain environmental factors. The highlighted findings in this review have significant implications in both basic studies and rice genetic improvement.

关键词： Anther development cytoplasmic male sterility hybrid sterility male fertility meiosis rice.

Maternal weight,blood lipids,and the offspring weight trajectories during infancy and early childhood in twin pregnancies

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World Journal of Pediatrics 2023年第10期19卷 961-971页

作者： Wei Zheng Ke-Xin Zhang xian-xian Yuan Jin-Ying Luo Jia Wang Wei Song Sheng-Nan Liang Xiao-Xin Wang Cui-Mei guo guang-Hui Li Division of Endocrinology and Metabolism Department of ObstetricsBeijing Obstetrics and Gynecology HospitalCapital Medical UniversityBeijing 100026China Beijing Maternal and Child Health Care Hospital Beijing 100026China Obstetrics and Gynecology Department Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics&Gynecology and PediatricsFujian Medical UniversityFuzhou 350001China

Background The intrauterine environment has a profound and long-lasting influence on the health of the ***,its impact on the postnatal catch-up growth of twin children remains ***,this study aimed to explore the maternal factors in pregnancy associated with twin offspring *** This study included 3142 live twin children born to 1571 mothers from the Beijing Birth Cohort Study conducted from 2016 to 2021 in Beijing,*** and corrected weight-for-age standard deviation scores of the twin offspring from birth to 36 months of age were calculated according to the World Health Organization Child Growth *** corresponding weight trajectories were identified by the latent trajectory *** factors in pregnancy associated with the weight trajectories of the twin offspring were examined after adjustment for potential *** Five weight trajectories of the twin children were identified,with 4.9%(154/3142)exhibiting insufficient catch-up growth,30.6%(961/3142),and 46.8%(1469/3142)showing adequate catch-up growth from different birth weights,and 15.0%(472/3142)and 2.7%(86/3142)showing various degrees of excessive catch-up *** short stature[adjusted odds ratio(OR)=0.691,95%confidence interval(CI)=0.563–0.848,P=0.0004]and lower total gestational weight gain(GWG)(adjusted OR=0.774,95%CI=0.616–0.972,P=0.03)were associated with insufficient catch-up growth of the *** stature(adjusted OR=1.331,95%CI=1.168–1.518,P<0.001),higher pre-pregnancy body mass index(BMI)(adjusted OR=1.230,95%CI=1.090–1.387,P<0.001),total GWG(adjusted OR=1.207,95%CI=1.068–1.364,P=0.002),GWG rate(adjusted OR=1.165,95%CI=1.027–1.321,P=0.02),total cholesterol(TC)(adjusted OR=1.150,95%CI=1.018–1.300,P=0.03)and low-density lipoprotein-cholesterol(LDL-C)(adjusted OR=1.177,95%CI=1.041–1.330)in early pregnancy were associated with excessive growth of the *** pattern of weight trajectories was similar bet

关键词： Maternal weight Multifetal Offspring growth Twin pregnancy

Dynamics of Poly(methyl methacrylate)in Ionic Liquids with Different Concentration and Cationic Structures

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Chinese Journal of Polymer Science 2023年第2期41卷 315-324页

作者： Huan Luo Xi He Gang Liu Yan-Hua Niu guang-xian Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering of ChinaSichuan UniversityChengdu610065China

The dynamic behavior of entangled poly(methyl methacrylate)(PMMA)chains in both the traditional monocationic ionic liquid(MIL)and synthetic dicationic ionic liquid(DIL)with the same anion bis[(trifluoromethyl)sulfonyl]imide([TFSI]−)has been examined over the wide composition range using differential scanning calorimetry and rheological ***/DIL and PMMA/MIL systems exhibit two glass transitions in the midrange of composition due to self-concentration *** in DIL shows slower relaxation behavior,however,after the iso-free-volume correction,the terminal relaxation timeτ_(0)of PMMA in both the DIL and MIL presents the power law behaviorτ_(0)∼ϕ^(v)with exponent v conforming to experimental results for conventional polymer solutions(v=2.0±0.2).At high ILs concentration(70%),the entanglement molecular weight M_(e)of PMMA/DIL system is lower than that of PMMA/MIL system owing to the formation of additional physical network in DIL,while the difference of M_(e)is reversed at low ILs *** composition dependence might be related to the fact that the probability of formation of physical cross-linking points in linked double imidazolium ring increases with the increase of DIL *** recovered creep strain of PMMA/DIL is almost 18 times of PMMA/MIL,exhibiting significantly better viscoelastic behavior.

关键词： Ionic liquids Terminal relaxation time Entanglement molecular weight Creep-recovery behavior

Zero-bit watermarking resisting geometric attacks based on composite-chaos optimized SVR model

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The Journal of China Universities of Posts and Telecommunications 2011年第2期18卷 94-101页

作者： GAO guang-yong JIANG guo-ping Center for Control & Intelligence Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Information Science & Technology Jiujiang University Jiujiang 332005 China

The problem to improve the performance of resisting geometric attacks in digital watermarking is addressed in this *** on the optimized support vector regression（SVR）,a zero-bit watermarking algorithm is *** proposed algorithm encrypts the watermarking image by using composite chaos with large key space and capacity against prediction,which can strengthen the safety of the proposed *** using the relationship between Tchebichef moment invariants of detected image and watermarking characteristics,the SVR training model optimized by composite chaos enhances the ability of resisting geometric *** analysis and simulations demonstrate that the proposed algorithm herein possesses better security and stronger robustness than some similar methods.

关键词： Tchebicbef moment invariants composite chaos SVR zero-bit watermarking