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Collision Avoidance Strategy Supported by LTE-V-Based Vehicle Automation and Communication Systems for Car Following

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Tsinghua Science and Technology 2020年第1期25卷 127-139页

作者： jiayang li Yi Zhang Mengkai Shi Qi liu Yi Chen Department of Mathematics Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Department of AutomationTsinghua UniversityBeijing 100084China Tsinghua-Berkeley Shenzhen Institute(TBSI) Shenzhen 518055China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Nanjing 210096China Beijing Nebula link Tech.Co.Ltd Beijing 100080China Network Technology Research Institute China UnicomBeijing 100044China

We analyzed and improved a collision avoidance strategy, which was supported by Long Term EvolutionVehicle(LTE-V)-based Vehicle-to-Vehicle(V2 V) communication, for automated vehicles. This work was completed in two steps. In the first step, we analyzed the probability distribution of message transmission time, which was conditional on transmission distance and vehicle density. Our analysis revealed that transmission time exhibited a near-linear increase with distance and density. We also quantified the trade-off between high/low resource reselection probabilities to improve the setting of media access parameters. In the second step, we studied the required safety distance in accordance with the response time, i.e., the transmission time, derived on the basis of a novel concept of Responsibility-Sensitive Safety(RSS). We improved the strategy by considering the uncertainty of response time and its dependence on vehicle distance and density. We performed theoretical analysis and numerical testing to illustrate the effectiveness of the improved robust RSS strategy. Our results enhance the practicability of building driverless highways with special lanes reserved for the exclusive use of LTE-V vehicles.

关键词： vehicle automation and communication collision avoidance Long Term Evolution-Vehicle(LTE-V) Responsibility-Sensitive Safety(RSS)

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An unprecedented one-arrow-two-hawks strategy achieves high yield with early flowering in rice

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Molecular Plant 2022年第9期15卷 1412-1414页

作者： Hong Yu Ning Shao jiayang li State Key Laboratory of Plant Genomics and National Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyThe Innovative Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

By 2021,nearly 9%of the global population was still suffering from *** has estimated that the world population will reach 9.7 billion in 2050(United Nations,2019;Tian et al.,2021),which requires a 2.4%increase per year for the yields of major ***,current growth rates are only half of this,imposing serious challenges in increasing grain yield by crop *** growth and development mainly require energy and nutrients,and thus it is generally considered that the crop yield could be increased by elevating photosynthetic efficiency and higher nitrogen-use ***,the uptake and transport of nitrogen must be coordinated with carbon fixation and production of carbohydrates by ***,effective strategies for optimizing the carbon/nitrogen status in crops are still relatively limited and therefore require new promising targets.

关键词： crops yield suffering

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基于流—固—热耦合的高温伺服阀蛇形流道散热罩散热效率研究

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航空科学技术 2024年第2期35卷 81-91页

作者：徐铭谦张健李佳洋东北林业大学黑龙江哈尔滨150040 哈尔滨工业大学黑龙江哈尔滨150001

电液伺服系统具有液控负载大、响应快的特点,因此其被广泛应用于航空领域。由于飞行器处于高温工况时,电液伺服系统会受极大影响,不利于飞行器的正常工作。针对这一问题,本文采用流—固—热多场耦合的方法对高温伺服阀散热罩蛇形流道进... 详细信息

电液伺服系统具有液控负载大、响应快的特点,因此其被广泛应用于航空领域。由于飞行器处于高温工况时,电液伺服系统会受极大影响,不利于飞行器的正常工作。针对这一问题,本文采用流—固—热多场耦合的方法对高温伺服阀散热罩蛇形流道进行了优化研究。首先,介绍了流—固—热三场耦合的理论基础,设计了7种散热罩的结构参数模型,分别建立了散热罩物理模型及流体模型。其次,在此基础上分析了7种模型的散热效果。研究结果表明,增加流道条数并不能提升散热效率,而增加散热罩沟槽宽度和沟槽深度可以提高散热效率,但散热效果并不明显。如要达到散热要求,可以通过增大散热流体流量、降低散热流体温度来实现。

关键词：电液伺服阀高温工况散热罩流—固—热三场耦合散热效率

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Advances in the regulation and crosstalks of phytohormones

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Chinese Science Bulletin 2009年第22期54卷 4069-4082页

作者： XIONG GuoSheng li jiayang WANG YongHong State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing) Institute of Genetics and Deve-lopmental Biology Chinese Academy of Sciences Beijing 100101 China

Various mutants defective in phytohormone biosynthesis and signaling pathways have been identified and characterized recently. Functional analysis of corresponding genes has greatly enriched our knowledge of phytohormone biosynthesis, transport, and signal transduction. Moreover, identification of phytohormone receptors and dissection of cross-talks among phytohormones allow us to elucidate the molecular basis of actions of phytohormones. The recent comprehensive work on the regulation of the biosynthesis, transport and signaling of phytohormones will help us to understand phytohormone actions in plant growth and development and their potential application in crop improvement. In this review, we summarize the latest work about phytohormones actions and highlight some common issues in this field.

关键词：激素调节植物激素串扰激素合成信号途径信号转导分子基础生物合成

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肺炎克雷伯菌外膜囊泡的研究进展

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医学研究与战创伤救治 2024年第6期37卷 657-662页

作者：周志涛李家扬吴秀文(综述) 任建安(审校) 南京医科大学金陵临床医学院(东部战区总医院)全军普通外科研究所南京210002

肺炎克雷伯菌是一种典型的肠杆菌科条件致病菌,也是六大超级细菌“ESKAPE”中的一员,通常定植在人类呼吸道和肠道,可引起肺炎、脑膜炎和血流感染等多种感染。外膜囊泡(OMV)是由革兰阴性菌自发分泌的具有生物学活性的囊泡状结构,含有多... 详细信息

肺炎克雷伯菌是一种典型的肠杆菌科条件致病菌,也是六大超级细菌“ESKAPE”中的一员,通常定植在人类呼吸道和肠道,可引起肺炎、脑膜炎和血流感染等多种感染。外膜囊泡(OMV)是由革兰阴性菌自发分泌的具有生物学活性的囊泡状结构,含有多糖、外膜蛋白和核酸等成分。现有研究证实肺炎克雷伯菌OMV在病原菌致病机制、传递效应因子以及与宿主相互作用等方面发挥重要作用。文章主要围绕肺炎克雷伯菌OMV的基本信息、生物学功能以及生物医学应用等方面进行讨论,对肺炎克雷伯菌OMV的最新研究进展进行综述。

关键词：外膜囊泡肺炎克雷伯菌病原体与宿主相互作用致病机制

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机器人关节机械驱动下手臂位置的闭环控制

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机械设计与研究 2024年第1期40卷 121-124,135页

作者：苏永华李佳阳韩蓉田易之戴璐广西制造工程职业技术学院智能制造工程学院南宁530105 哈尔滨石油学院机械工程学院哈尔滨150000 新疆大学电气工程学院乌鲁木齐830000 广西壮族自治区海洋研究院南宁530022

由于机器人的手臂运动涉及到非线性动力学效应,使得手臂的运动模式复杂,手臂位置闭环控制难度较大、精度较低。为此,提出机器人关节机械驱动下手臂位置闭环控制方法。利用力矩传感器在关节上展开力矩反馈来完成机械驱动机器人的动力学建... 详细信息

由于机器人的手臂运动涉及到非线性动力学效应,使得手臂的运动模式复杂,手臂位置闭环控制难度较大、精度较低。为此,提出机器人关节机械驱动下手臂位置闭环控制方法。利用力矩传感器在关节上展开力矩反馈来完成机械驱动机器人的动力学建模,通过动力学模型准确估计动力学参数;基于模糊神经网络改进PID控制器,模糊神经网络可以作为PID控制器的前馈部分,导致输入动力学参数可提供更准确的控制信号。将期望的轨迹参数、关节力矩参数等动力学参数作为PID控制器控制目标,通过粒子群算法通过不断迭代和优化找到最优解,实现对机器人手臂位置展开闭环控制。实验结果表明,该方法的控制稳定性强、控制精度高,关节角误差在1%以内,且关节力矩变化幅度较小。

关键词：机械驱动闭环控制改进粒子群算法 PID控制模糊神经网络

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Activation-Tagged Suppressors of a Weak Brassinosteroid Receptor Mutant

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Molecular Plant 2010年第1期3卷 260-268页

作者： Bin Kang Hao Wang Kyoung Hee Nam jiayang li Jianming li Department of Molecular Cellular and Developmental Biology University of Michigan 830 N. University Ann Arbor MI 48109-1048 USA Division of Biological Sciences Sookmyung Woman's University 52 Hyochangwon-gil Yongsan-gu Seoul 140-742 Korea State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China

Brassinosteroids （BRs） are important plant hormones that act synergistically with auxin to regulate a variety of plant developmental and physiological processes. In the past decade, genetic and biochemical studies have revealed a linear signaling pathway that relies on protein phosphorylation to transmit the BR signal into the nucleus, altering ex- pression of hundreds of genes to promote plant growth. We conducted an activation-tagging based suppressor screen to look for Arabidopsis genes that, when overexpressed by inserted 35S enhancer elements, could suppress the dwarf phe- notype of a weak BR receptor mutant bril-301. This screen identified a total of six dominant activation-tagged bril sup- pressors （atbs-Ds）. Using a plasmid rescue approach, we discovered that the bril-301 suppression effect in four atbs-D mutants （atbs3-D to atbs6-D） was caused by overexpression of a YUCCA gene thought to be involved in tryptophan- dependent auxin biosynthesis. Interestingly, the three activation-tagged YUCCA genes belong to the YUCCA IIA subfamily that includes two other members out of 11 known Arabidopsis YUCCA genes. In addition, our molecular studies revealed a T-DNA insertion near a basic helix-loop-helix gene in atbsl-D and a T-DNA insertion in a region carrying a BR biosynthetic gene in atbs2-D. Further studies of these atbs-D mutants could lead to better understanding of the BR signaling process and the BR-auxin interaction.

关键词： Brassinosteroid BRI1 bril-301 auxin YUCCA.

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Retrospective and perspective of rice breeding in China

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Journal of Genetics and Genomics 2018年第11期45卷 603-612页

作者： Shiwei Bai Hong Yu Bing Wang jiayang li State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental BiologyThe Innovative Academy of Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Breeding is the art and science of selecting and changing crop traits for the benefit of human beings. For several decades, tremendous efforts have been made by Chinese scientists in rice breeding in improving grain yield, nutrition quality, and environmental performance, achieving substantial progress for global food security. Several generations of crop breeding technologies have been developed, for example,selection of better performance in the field among variants(conventional breeding), application of molecular markers for precise selection(molecular marker assisted breeding), and development of molecular design(molecular breeding by rational design). In this review, we briefly summarize the advances in conventional breeding, functional genomics for genes and networks in rice that regulate important agronomic traits, and molecular breeding in China with focuses on high yield, good quality,stress tolerance, and high nutrient-use efficiency. These findings have paved a new avenue for rational design of crops to develop ideal varieties with super performance and productivity.

关键词： Rice breeding Heterosis Breeding by rational design Molecular breeding

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Identification of auxin responsive genes in Arabidopsis by cDNA array

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Chinese Science Bulletin 2002年第7期47卷 548-552页

作者： Bao Fang Hu Yuxin li jiayang Institute of Genetics Chinese Academy of Sciences100101BeijingChina

The plant hormone auxin influences a variety of developmental and physiological processes. But the mechanism of its action is quite unclear. In order to identify and analyze the expression of auxin responsive genes, a cDNA array approach was used to screen for genes with altered expression from Arabidopsis suspension culture after IAA treatment and was identified 50 differentially expressed genes from 13824 cDNA clones. These genes were related to signal transduction, stress responses, senescence, photosynthesis, protein biosynthesis and transportation. The results provide the molecular evidence that auxin influences a variety of physiological processes and pave a way for further investigation of the mechanism of auxin action. Furthermore, we found that the expression of a ClpC (regulation subunit of Clp protease) was repressed by exogenous auxin, but increased in dark-induced senescing leaves. This suggests that ClpC may be a senescence-associated gene and can be regulated by auxin.

关键词： cDNA array auxin responsive genes Arabidopsis thaliana ClpC senescence-associated genes.

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Arabidopsis Indole Synthase, a Homolog of Tryptophan Synthase Alpha, is an Enzyme Involved in the Trp-independent Indole-containing Metabolite Biosynthesis

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Journal of Integrative Plant Biology 2008年第9期50卷 1070-1077页

作者： RuiZhang Bing Wang Jian Ouyang jiayang li YonghongWang State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biologythe Chinese Academy of Sciences Beijing 100101 China Graduate School the Chinese Academy of Sciences Beijing 100039 China

The plant tryptophan （Trp） biosynthetic pathway produces many secondary metabolites with diverse functions. Indole- 3-acetic acid （IAA）, proposed as a derivative from Trp or its precursors, plays an essential role in plant growth and development. Although the Trp-dependant and Trp-independent IAA biosynthetic pathways have been proposed, the enzymes, reactions and regulatory mechanisms are largely unknown. In Arabidopsis, indole-3-glycerol phosphate （IGP） is suggested to serve as a branchpoint component in the Trp-independent IAA biosynthesis. To address whether other enzymes in addition to Trp synthase ~ （TSA1） catalyze IGP cleavage, we identified and characterized an indole synthase （INS） gene, a homolog of TSA1 in Arabidopsis. INS exhibits different subcellular localization from TSA1 owing to the lack of chloroplast transit pepUde （cTP）. In si//co data show that the expression levels of INS and TSA1 in all examined organs are quite different. Histochemical staining of INS promoter-GUS transgenic lines indicates that INS is expressed in vascular tissue of cotyledons, hypocotyls, roots and rosette leaves as well as in flowers and siliques. INS is capable of complementing the Trp auxotrophy of Escherichia co// AtrpA strain, which is defective in Trp synthesis due to the deletion of TSA. This implies that INS catalyzes the conversion of IGP to indole and may be involved in the biosynthesis of Trp-independent IAA or other secondary metabolites in Arabidopsis.

关键词： Arabidopsis indole-3-acetic acid indole synthase secondary metabolite tryptophan

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