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Central limit theorem for quadratic errors of Nadaraya–Watson regression estimator under dependence
Zhi-Ming Luo,Gyu Moon Song,Tae Yoon Kim 한국통계학회 2011 Journal of the Korean Statistical Society Vol.40 No.4
In this paper, we derive the central limit theorem (CLT) for quadratic error where the Nadaraya-Watson regression estimator is employed under dependence. Our results may be applicable for various nonparametric regression models including nonlinear autoregressive model. In addition, we discuss the usefulness of our results for obtaining test statistics specifying a regression model under dependence. The proof uses CLT for variable degenerate U-statistics due to Kim and Luo (in press).
Ming-Zhi Zhao,Qiang Luo,Liang-Wei Jiang,Ming Wei 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
To investigate the stratigraphic sequence in the ancient Yellow River Delta and further discuss the correlation of compressibility of undisturbed soils with depositional environments, two boreholes were drilled at Liyao test site in Cangzhou, Hebei Province, China. Some basic tests regarding to index properties were performed on sediments from one borehole, and oedometer test was conducted for the “undisturbed samples” collected from the other. The stratigraphic sequence in the study area is classified into four depositional systems in terms of sedimentation environment. Evaluation of sample disturbance shows that the “undisturbed samples” for oedometer test are just slightly disturbed in the sampling process. Since overall compressibility can be divided into intrinsic compressibility and additional one, the environmental factors that can affect soil microstructure are closely correlated with additional compressibility. Thus, the influencing mechanism of depositional rate on additional void index ΔIv was investigated quantitatively. Moreover, the relationship between floating range of yield stress and buried depth is established. Then, the additional compressibility of undisturbed samples can be evaluated with depositional rate and buried depth. Finally, the predicted overall compression curve with the proposed method in this study is compared with the measured curve to verify the reasonability and feasibility.
Empirical Bayesian Markov Chain Model for Random Model Change
Zhi-Ming Luo,김태윤,김범준 계명대학교 자연과학연구소 2014 Quantitative Bio-Science Vol.33 No.1
In this short paper we consider long term binary prediction of stock market by using empirical Bayesian Markov chain model. Our empirical Bayesian MC model is designed to accommodate random change of MC over time. Surprisingly enough, it is shown that empirical Bayesian MC model is homogeneous and has limiting distribution though it accommodates random model change over time. Empirical works are given to illustrate usefulness of our results.
Zhi-Bin Hu,He-An Luo,Xiao-Guang Wang,Ming-Zhi Huang,Lu Huang,Huai-Lin Pang,Chun-Hui Mao,Hui Pei,Chao-Qun Huang,Jiong Sun,Ping-Le Liu,Ai-Ping Liu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
In attempt to lead compounds exhibiting both insecticidal and fungicidal activities, a series of O-benzyl oximeether derivatives were designed and synthesized by introducing β-methoxyacrylate pharmacophore into a scaffold. The insecticidal activity against Aphis fabae and the fungicidal activity against Erysiphe graminis were screened. The title compounds exhibited remarkable insecticidal and fungicidal activities. The most potent compound 6d was identified. Its insecticidal LC50 against A. fabae is 6.4 mg/L, which is lower than that of chlorfenapyr (19.4 mg/L) and even close to the level of imidacloprid (4.8 mg/L). Its fungicidal EC90 in preventive and curative treatment against E. graminis are 2.2 and 4.8 mg/L, respectively, which are lower than azoxystrobin (7.0 and 5.9 mg/L). These results indicate that compound 6d can be considered as a lead for further developing new O-benzyl oxime-ether typed candidates with both fungicidal and insecticidal activities.
Hu, Zhi-Bin,Luo, He-An,Wang, Xiao-Guang,Huang, Ming-Zhi,Huang, Lu,Pang, Huai-Lin,Mao, Chun-Hui,Pei, Hui,Huang, Chao-Qun,Sun, Jiong,Liu, Ping-Le,Liu, Ai-Ping Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
In attempt to lead compounds exhibiting both insecticidal and fungicidal activities, a series of O-benzyl oximeether derivatives were designed and synthesized by introducing ${\beta}$-methoxyacrylate pharmacophore into a scaffold. The insecticidal activity against Aphis fabae and the fungicidal activity against Erysiphe graminis were screened. The title compounds exhibited remarkable insecticidal and fungicidal activities. The most potent compound 6d was identified. Its insecticidal $LC_{50}$ against A. fabae is 6.4 mg/L, which is lower than that of chlorfenapyr (19.4 mg/L) and even close to the level of imidacloprid (4.8 mg/L). Its fungicidal $EC_{90}$ in preventive and curative treatment against E. graminis are 2.2 and 4.8 mg/L, respectively, which are lower than azoxystrobin (7.0 and 5.9 mg/L). These results indicate that compound 6d can be considered as a lead for further developing new O-benzyl oxime-ether typed candidates with both fungicidal and insecticidal activities.
Key Application Technologies of High Efficiency Power Quality Control Systems
Ding-Guo Liu,Zhi-kang Shuai,Chun-ming Tu,Ying Cheng,An Luo 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3
Large capacity reactive power compensation and harmonic control in the low-voltage grid of an enterprise, are important technical means to improve power quality and reduce power loss. In this paper, the principle of an efficient power quality controller is analyzed. Then, key application technologies of the HPQC which would influence the performances of the HPQC are studied. Based on an analysis of the harmonic shunt problem, a frequency dividing control strategy of the HPQC continuous subsystem is proposed. A parameter design method of the HPQC discrete subsystem and its installation method are also proposed to ensure the system compensation effect. HPQC systems have been designed for a copper foil plant. The effectiveness of this paper has been verified by the simulation and application results.
Key Application Technologies of High Efficiency Power Quality Control Systems
Liu, Ding-Guo,Shuai, Zhi-Kang,Tu, Chun-Ming,Cheng, Ying,Luo, An The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3
Large capacity reactive power compensation and harmonic control in the low-voltage grid of an enterprise, are important technical means to improve power quality and reduce power loss. In this paper, the principle of an efficient power quality controller is analyzed. Then, key application technologies of the HPQC which would influence the performances of the HPQC are studied. Based on an analysis of the harmonic shunt problem, a frequency dividing control strategy of the HPQC continuous subsystem is proposed. A parameter design method of the HPQC discrete subsystem and its installation method are also proposed to ensure the system compensation effect. HPQC systems have been designed for a copper foil plant. The effectiveness of this paper has been verified by the simulation and application results.
Ya-Li Zhang,Hong-Zhi Zhang,Ming-Wei Du,Wei Li,Hong-Hai Luo,Wah-Soon Chow,Wang-Feng Zhang 한국식물학회 2010 Journal of Plant Biology Vol.53 No.1
Under severe water stress, leaf wilting is quite general in higher plants. This passive movement can reduce the energy load on a leaf. This paper reports an experimental test of the hypothesis that leaf wilting movement has a protective function that mitigates against photoinhibition of photosynthesis in the field. The experiments exposed cotton (Gossypium hirsutum L.) to two water regimes: waterstressed and well-watered. Leaf wilting movement occurred in water-stressed plants as the water potential decreased to −4.1 MPa, reducing light interception but maintaining comparable quantum yields of photosystem II (PS II; Yield for short) and the proportion of total PS II centers that were open (qP). Predrawn Fv/Fm (potential quantum yield of PS II) as an indicator of overnight recovery of PS II from photoinhibition was higher than or similar to that in wellwatered plants. Compared with water-stressed cotton leaves for which wilting movement was permitted, water-stressed cotton leaves restrained from such movement had significantly increased leaf temperature and instantaneous CO2assimilation rates in the short term, but reduced Yield, qP,and Fv/Fm. In the long term, predrawn Fv/Fm and CO2assimilation capacity were reduced in water-stressed leaves restrained from wilting movement. These results suggest that, under water stress, leaf wilting movement could reduce the incident light on leaves and their heat load, alleviate damage to the photosynthetic apparatus due to photoinhibition,and maintain considerable carbon assimilation capacity in the long term despite a partial loss of instantaneous carbon assimilation in the short term.
Central limit theorems for nonparametric estimators with real-time random variables
Kim, Tae Yoon,Luo, Zhi-Ming Blackwell Publishing Ltd 2010 Journal of time series analysis Vol.31 No.5
<P>In this article, asymptotic theories for nonparametric methods are studied when they are applied to real-time data. In particular, we derive central limit theorems for nonparametric density and regression estimators. For this we formally introduce a sequence of real-time random variables indexed by a parameter related to fine gridding of time domain (or fine discretization). Our results show that the impact of fine gridding is greater in the density estimation case in the sense that strong dependence due to fine gridding severely affects the major strength of nonparametric density estimator (or its data-adaptive property). In addition, we discuss some issues about nonparametric regression model with fine gridding of time domain.</P>
Using the dependent wild bootstrap for the nonparametric goodness-of-fit test for density functions
Kim, Taeyoon,Park, Cheolyong,Ha, Jeongcheol,Luo, Zhi-Ming,Hwang, Sun Young Taylor Francis 2016 Statistics Vol.50 No.4
<P>In this paper, we consider the well-known nonparametric consistent model-specification test for the stationary density function (see [Ait-Sahalia Y. Testing continuous-time models of the spot interest rate. Rev Financ Stud. 1996;9:385-426; Li Q. Nonparametric testing of closeness between two unknown distribution functions. Econ Rev. 1996;15:261-274; Fan Y, Ullah A. On goodness-of-fit tests for weakly dependent processes using kernel method. J Nonparametric Stat. 2000;11:337-360]) and reinvestigate it carefully using asymptotics and simulation. Our work reveals that the test is subject to power and size distortions, which are mainly caused by dependence or convergence rate changes under the null and alternative hypothesis. A dependent wild bootstrap is newly suggested as a feasible remedy to such distortions. Our result provides a complete explanation as well as a solution to the problem that experienced by Ait-Sahalia [Testing continuous-time models of the spot interest rate. Rev Financ Stud. 1996;9:385-426], that is, that the test rejects true models too often when independent and identically distributed asymptotic critical values are used.</P>