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INTEGRAL-TYPE TESTS FOR GOODNESS-OF-FIT

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Journal of Systems Science & Complexity 2010年第4期23卷 784-795页

作者： Junjian ZHANG guoying li College of Mathematics Guangxi Normal University Guilin 541004 China College of Applied Sciences Beijing University of Technology Beijing 100124 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

A family of integral-type goodness-of-fit tests is investigated. This family includes some existing tests, such as the Cramer-von Mises test and Anderson-Darling test, etc. The asymptotic distributions of the tests in the family under the null and local alternative hypotheses are established. The almost sure convergence under a fixed underlying distribution is obtained. Furthermore, simulations are conducted to compare the powers of the tests in the family. Simulation results show that for different alternatives, the more powerful tests are different, and the parameter ）, has great influence on the tests in small sample cases.

关键词： Asymptotic distribution goodness-of-fit integral-type tests power comparison.

LARGE SAMPLE AND ROBUST PROPERTIES OF L^2-MEDIAN

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Journal of Systems Science & Complexity 2010年第6期23卷 1133-1142页

作者： Tianfa XIE guoying li College of Applied Sciences Beijing University of Technology Beijing 100124 China. Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China.

As a competitive depth, L^2-depth is modified from L^2-depth. Its induced median is called L^2-median. Basic properties of the median and its sample version are provided. Especially, the strong consistency of sample median is gained under weaker condition. Robustness of the median and its sample version is discussed. Besides ease of computation, it is shown that L^2-median has both good large-sample and robust properties. Simulation studies are also given to compare the breakdown point of L^2-median with that of other depth-induced medians.

关键词： Breakdown point consistency data depth influence function multivariate median.

Model of water-sediment regulation in Yellow River and its effect

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Science China(Technological Sciences) 2011年第4期54卷 924-930页

作者： li guoying SHENG lianXi 1 Yellow River Conservancy Commission Zhengzhou 450003China Northeast Normal University Changchun 130024China

Water-sediment regulation of the Yellow River is to regulate and control the flow and sediment transport relationship of the lower reaches through reservoirs on the main streams and tributaries to create balance between water and sediment so that sediment transport capacity of the downstream channels can be maximized,shrinking of channels be contained,and medium flood channel be restored and *** years' research by the Yellow River Conservancy Commission(YRCC) reveals the water and sediment transport relationship that will prevent sedimentation at the downstream river *** on this relationship and coming sediment and water conditions in the Yellow River basin,the YRCC,with maximized use of reservoirs on the main streams and tributaries,has developed three models of water-sediment regulation:single Xiaolangdi Reservoir-dominated regulation,space scale water-sediment match,and mainstream reservoirs joint *** water-sediment regulations based on these three models have resulted in an average drop of 1.5 m in the main channel of the downstream 800 km river and an increase of carrying capacity from 1800 to 4000 m3/***,the wetland ecosystems of estuarine delta has also been improved and restored significantly.

关键词： water-sediment regulation Yellow River effect

Testing for the maximum cell probabilities in multinomial distributions

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Science China Mathematics 2005年第7期48卷 972-985页

作者： XIONG Shifeng li guoying Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

This paper investigates one-sided hypotheses testing for p, the largest cell probability of multinomial distribution. A small sample test of Ethier (1982) is extended to the general cases. Based on an estimator of p, a kind of large sample tests is proposed. The asymptotic power of the above tests under local alternatives is derived. An example is presented at the end of this paper.

关键词： multinomial distribution, hypothesis testing, maximum multinomial probability, order statistics,asymptotic distribution, local alternatives.

GENERAliZED p-VALUES FOR TESTING REGRESSION COEFFICIENTS IN PARTIALLY liNEAR MODELS

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Journal of Systems Science & Complexity 2010年第6期23卷 1118-1132页

作者： Huimin HU Xingzhong XU guoying li School of Statistics and Mathematics Shandong University of Finance Jinan 250014 China. Department of Mathematics Beijing Institute of Technology Beijing 100081 China. Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China.

The one-sided and two-sided hypotheses about the parametric component in partially linear model are considered in this paper. Generalized p-values are proposed based on fiducial method for testing the two hypotheses at the presence of nonparametric nuisance parameter. Note that the nonparametric component can be approximated by a linear combination of some known functions, thus, the partially linear model can be approximated by a linear model. Thereby, generalized p-values for a linear model are studied first, and then the results are extended to the situation of partially linear model. Small sample frequency properties are analyzed theoretically. Meanwhile, simulations are conducted to assess the finite sample performance of the tests based on the proposed p-values.

关键词： Fiducial inference frequency property generalized p-value hypothesis testing partially linear model.

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玉米育种均格式锥体排种器仿真分析试验

农机化研究 2025年第1期47卷 173-177,184页

作者：曹潘冬丁勇李振佐李国莹杨然兵青岛农业大学机电工程学院山东青岛266109 青岛普兰泰克机械科技有限公司山东青岛266109 海南大学机电工程学院海口570228

针对玉米育种试验过程中出苗率低、现有条播排种器播种不均匀无法满足试验要求等问题,在现有条播排种器基础上进行优化设计;通过在锥体上增加均格的方式来提高排种均匀性,分析了锥体倾斜角度、均格数量和锥体转速对均格式锥体排种器排... 详细信息

针对玉米育种试验过程中出苗率低、现有条播排种器播种不均匀无法满足试验要求等问题,在现有条播排种器基础上进行优化设计;通过在锥体上增加均格的方式来提高排种均匀性,分析了锥体倾斜角度、均格数量和锥体转速对均格式锥体排种器排种性能的影响,并进行仿真试验。试验结果表明:在锥体转速为0.8 rad/s、锥体倾斜角为48.1°、锥体均格数量为30个时,排种性能最优,排种均匀性变异系数降为20.295%;影响排种均匀性的主次因素为锥体均格数量>锥体倾角>锥体转速。田间试验表明:对比无均格锥体排种器,优化后的均格式锥体排种器排种均匀性变异系数降低18.73%,排种器的排种性能显著提升,能够满足小区试验要求。

关键词：排种器均格式锥体排种均匀性仿真玉米

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高精度小区播种机自校正系统研究

农机化研究 2025年第2期47卷 44-48页

作者：李振佐杨然兵曹潘冬李国莹丁勇青岛农业大学机电工程学院山东青岛266109 海南大学机电工程学院海口570228 青岛普兰泰克机械科技有限公司山东青岛266109

在小区育种试验的播种环节过程中,小区行长和间隔的精准控制尤为关键,现常用的控制方式为北斗定位系统控制和编码器控制,但目前民用的北斗定位模块经过差分处理后,基本上接收北斗卫星发送的信号频率只能达到20 Hz,造成整个控制过程不是... 详细信息

在小区育种试验的播种环节过程中,小区行长和间隔的精准控制尤为关键,现常用的控制方式为北斗定位系统控制和编码器控制,但目前民用的北斗定位模块经过差分处理后,基本上接收北斗卫星发送的信号频率只能达到20 Hz,造成整个控制过程不是连续的。根据编码器的基本原理可知,控制精度虽低于北斗卫星,但编码器两个脉冲发送间隔低于北斗定位系统接收频率。为此,将编码器与北斗定位系统相互融合,设计了一种高净度的小区播种机自校正系统。大量田间试验结果表明:所研究的小区播种机自校正系统能够将小区长度误差精度控制在0.67%以内,相较于传统的编码器和北斗定位模式而言精度大大提升。

关键词：小区育种北斗定位系统编码器自校正

Inference for ordered parameters in multinomial distributions

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Science China Mathematics 2009年第3期52卷 526-538页

作者： XIONG ShiFeng li guoying Academy of Mathematics and Systems Sciences Chinese Academy of SciencesBeijing 100190China

This paper discusses inference for ordered parameters of multinomial distributions. We first show that the asymptotic distributions of their maximum likelihood estimators (MLEs) are not always normal and the bootstrap distribution estimators of the MLEs can be inconsistent. Then a class of weighted sum estimators (WSEs) of the ordered parameters is proposed. Properties of the WSEs are studied, including their asymptotic normality. Based on those results, large sample inferences for smooth functions of the ordered parameters can be made. Especially, the confidence intervals of the maximum cell probabilities are constructed. Simulation results indicate that this interval estimation performs much better than the bootstrap approaches in the literature. Finally, the above results for ordered parameters of multinomial distributions are extended to more general distribution models.

关键词： multinomial distribution ordered parameters weighted sum estimator asymptotic normality 62F07 62F12

Investigation of the solubility and dispersion degree of calf skin collagen in ionic liquids

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Journal of Leather Science and Engineering 2019年第1期1卷 123-134页

作者： Sicong liu Qian li guoying li National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu 610065People’s Republic of China Key Laboratory of Leather Chemistry and Engineering(Ministry of Education) Sichuan UniversityChengdu 610065People’s Republic of China

The dissolution of collagen in ionic liquids(ILs)was highly dependent on the polarity of ILs,which was influenced by their sorts and ***,the solubility and dispersion degree of collagen in two sorts of ILs,namely 1-ethyl-methylimidazolium tetrafluoroborate([EMIM][BF4])with low polarity and 1-ethyl-3-methylimidazolium acetate([EMIM][Ac])with high polarity in a concentration range from 10% to 70% at 10℃ were *** 150 mg of collagen was added to 30 mg of ILs,the minimum soluble collagen concentration was 0.02 mg/mL in 70%[EMIM][BF4]with lowest polarity and the maximum was 3.57 mg/mL in 70%[EMIM][Ac]with highest polarity,which indicates that soluble collagen and insoluble collagen fibers were both *** insoluble collagens,differential scanning calorimetry showed that the thermal-stability was weakened when increasing the ILs concentration and polarity,and the fiber arrangement was looser with a more uniform lyophilized structure,observed by atomic force microscopy and scanning electron *** soluble collagens,electrophoresis patterns and Fourier transform infrared spectroscopy showed that no polypeptide chain degradation occurred during dissolution,but the thermal denaturation temperature decreased by 0.26℃~7.63℃ with the increase of ILs concentrations,measured by ultra-sensitive differential scanning ***,the aggregation of collagen molecules was reduced when ILs polarity was increased as determined by fluorescence measurements and dynamic light scattering,which resulted in an increased loose fiber arrangement observed by atomic force *** the structural integrity of collagen needs to be retained,then the ILs sorts and concentrations should be considered.

关键词： Ionic liquids concentrations Collagen solubility Structural integrity Dispersion degree Aggregation state