Identification of QTLs for agronomic traits in indica rice using an RIL population

Feifei Xu,Yan Huang,Jinsong Bao 한국유전학회 2015 Genes & Genomics Vol.37 No.10

Increasing grain weight and breeding for ideal plant architecture are two means to improve the productivity of rice. Quantitative trait locus (QTL) mapping was conducted on ten yield component traits using a recombinant inbred line population derived from an indica 9 indica cross (M201 9 JY293). Correlation analysis revealed that plant height, panicle length and flag leaf length, classified as plant morphology traits, were positively correlated with grain shape traits such as thousandgrain weight, grain length and grain width. Two tillering traits, total and effective tiller numbers, showed negative correlations with nearly all the other traits tested. A total of 37 QTLs were detected over the 2-year study period, and 14 of them were identified in both years. Four clustered QTLs corresponding to known genes/QTLs (GW2, GS3, qGL3 and qTGW3.3) were revealed on chromosomes 2 and 3, which had pleiotropic effects on grain weight and plant architecture traits. QTL mapping demonstrated that qGL3 was a major QTL controlling grain length and weight, as well as plant height, panicle length and flag leaf length in rice. Three new QTLs, qTGW3.0, qGL2.2 and qETN4, were detected in both years and worth attention in breeding for high-yield rice varieties.

한·중 대학생이 지각한 부모양육태도와 심리적 독립이 진로태도성숙에 미치는 영향

허비비(Xu Feifei),강진령(Kang, Jinryung) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.6

본 연구의 목적은 한국과 중국 대학생을 비교하여 양국의 부모양육태도와 심리적 독립성이 진로태도성숙에 미치는 영향을 알아보고자 하였다. 이를 위해 한국 서울특별시와 중국 상해특별시에 소재한 4개의 4년제 대학교 재학생 237명을 대상으로 설 문지를 실시하였다. 한국과 중국 대학생이 지각하는 부모양육태도, 심리적 독립성,진로태도성숙의 비교를 위해 독립표본 t-검정을 실시하였고, 부모양육태도와 심리적독립성이 각각 진로태도성숙에 미치는 영향을 검증하고자 다중회귀분석을 하였다. 연구결과는 한국과 중국 대학생이 지각하는 부모양육태도, 심리적 독립성, 진로태도성숙의 차이에서 전반적으로 한국이 중국보다 높게 나타났다. 변수 간 영향관계 검증결과에서 첫째, 한국은 부의 자율과 성취 그리고 모의 자율, 중국은 부의 애정과 자율 그리고 모의 자율과 성취가 진로태도성숙에 정적 영향을 미치는 것으로 나타났다. 둘째, 한국은 부모로부터의 기능적 독립과 갈등적 독립이 진로태도성숙에 정적영향을 미치는 것으로 나타났으며 태도적 독립은 진로태도성숙에 부적 영향을 미치 는 것으로 나타났다. 중국은 부로부터의 기능적 독립 그리고 모로부터의 기능적 독립과 갈등적 독립이 진로태도성숙에 정적 영향을 미치고, 태도적 독립이 진로태도성숙에 부적 영향을 미치는 것으로 나타났다. 이러한 결과는 한국과 중국 부모를 대상 으로 부모교육을 통해 양육태도에 대한 고찰의 필요가 있음을 말하며, 대학 입학 전청소년시기부터 자립과 독립에 대한 프로그램을 적용하여 진로태도성숙을 향상시켜 진로선택과 결정에 도움을 줄 수 있을 것이다. The purpose of this study was to make a comparison between South Korean and Chinese college students, and investigate the effects of the parenting attitudes and psychological independence perceived by college students on the career attitude maturity in both countries. To these, 237 students of all the grades at four universities in Seoul, and Shanghai participated in this study. Independent-sample t-test was performed to compare perceived parenting attitudes, psychological independence, and career attitude maturity between South Korean and Chinese college students. Multiple regression analysis was performed to assess the effects of parenting attitudes and psychological independence on career attitude maturity and stepwise regression analysis was carried out to identify the factors having significant effects. As for the results of the study, South Korean students were at higher levels of both determination, preparation, independence, and purposefulness and entire career attitude maturity than Chinse ones. As for the affecting relations among variables, first, father and mother s autonomy and achievement positively affected career attitude maturity in South Korea and father s affection and autonomy, mother s autonomy and achievement positively affected career attitude maturity in China. Second, functional and conflicting independence from father and mother positively affected career attitude maturity in South Korea, whereas career attitude maturity was positively affected by functional independence from father and conflicting independence from mother but was negatively affected by attitudinal independence in China. The results of this study suggest the need to consider parenting attitudes through education for South Korean and Chinese parents and it is necessary to begin applying a self-reliance and independence program in adolescence before going to ollege with the objective of improving career attitude maturity and assisting them with career selection and decision.

Thermal Model for Power Converters Based on Thermal Impedance

Xu, Yang,Chen, Hao,Lv, Sen,Huang, Feifei,Hu, Zhentao The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6

In this paper, the superposition principle of a heat sink temperature rise is verified based on the mathematical model of a plate-fin heat sink with two mounted heat sources. According to this, the distributed coupling thermal impedance matrix for a heat sink with multiple devices is present, and the equations for calculating the device transient junction temperatures are given. Then methods to extract the heat sink thermal impedance matrix and to measure the Epoxy Molding Compound (EMC) surface temperature of the power Metal Oxide Semiconductor Field Effect Transistor (MOSFET) instead of the junction temperature or device case temperature are proposed. The new thermal impedance model for the power converters in Switched Reluctance Motor (SRM) drivers is implemented in MATLAB/Simulink. The obtained simulation results are validated with experimental results. Compared with the Finite Element Method (FEM) thermal model and the traditional thermal impedance model, the proposed thermal model can provide a high simulation speed with a high accuracy. Finally, the temperature rise distributions of a power converter with two control strategies, the maximum junction temperature rise, the transient temperature rise characteristics, and the thermal coupling effect are discussed.

A Novel Model of Stock Data Mining with M/G/1 Queue for Evaluation of Stock Crash

Qingzhen Xu,Feifei Zhang 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.5

Data mining is the process of searching the information from a large amount of data. In order to evaluate the stock crash this paper proposes general decrementing service M/G/1 queue system with multiple adaptive vacations to find information related to stock crash in data about Shanghai Composite Index. We use the probability generating function (P.G.F.) of stationary queue length and LST of waiting time, and their stochastic decomposition to calculate Existing money flow. Existing Money flow calculation model is improved based on the stationary queue length and LST of waiting time. We program to achieve the stock of existing money flow algorithm, and get the number of existing money flow. The improved algorithm can early warn the stock market crash. The empirical result shows that: There will be a rise in price before the Stock Market Crash, and the stock of existing money inflow begin to decrease. The stock market crash fell for at least six months. The stock market crash fell by at least fifty-five percent. Most of the stock market crash fell by over seventy-percent. The stock market crash down time is inversely proportional to the magnitude of the decline. If the down time is short, the magnitude of the decline is large. If the down time is long, the magnitude of the decline is small. The stock market crash is great harm to investors.

Difference in Lake Water Area Derived from Different Resolution Imagery

Rong Xu,Zengxiang Zhang,Feifei Sun,Qingke Wen,Fang Liu 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.4

In order to study the difference in lake water area derived from satellite images with different resolutions, the lake distribution maps with 30 m, 250 m and 500 m spatial resolution were derived from HJ-1A/B and MODIS data acquired in the same period. It is showed that the area estimates derived from both 250 m MODIS and 500 m MODIS have strong correlations with those derived from HJ-1A/B data for lakes with area larger than 10 km2. And 500 m MODIS data can get nearly the same estimates as 250 m MODIS data. For further analysis of the difference in lake water area, those lakes were divided into three groups according to the shape indices of lake water body, which were calculated with the results extracted from HJ-1A/B imagery. Taking HJ-1A/B lake maps as reference, it is found that the error of estimates from MODIS data increases when the lake area decreases and the shape complexity increases.

Thermal Model for Power Converters Based on Thermal Impedance

Yang Xu,Hao Chen,Sen Lv,Feifei Huang,Zhentao Hu 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6

In this paper, the superposition principle of a heat sink temperature rise is verified based on the mathematical model of a plate-fin heat sink with two mounted heat sources. According to this, the distributed coupling thermal impedance matrix for a heat sink with multiple devices is present, and the equations for calculating the device transient junction temperatures are given. Then methods to extract the heat sink thermal impedance matrix and to measure the Epoxy Molding Compound (EMC) surface temperature of the power Metal Oxide Semiconductor Field Effect Transistor (MOSFET) instead of the junction temperature or device case temperature are proposed. The new thermal impedance model for the power converters in Switched Reluctance Motor (SRM) drivers is implemented in MATLAB/Simulink. The obtained simulation results are validated with experimental results. Compared with the Finite Element Method (FEM) thermal model and the traditional thermal impedance model, the proposed thermal model can provide a high simulation speed with a high accuracy. Finally, the temperature rise distributions of a power converter with two control strategies, the maximum junction temperature rise, the transient temperature rise characteristics, and the thermal coupling effect are discussed.

Genome‑wide association study of vitamin E using genotyping by sequencing in sesame (Sesamum indicum)

Qiang He,Feifei Xu,민명현,추상호,김규원,박용진 한국유전학회 2019 Genes & Genomics Vol.41 No.9

Background At least eight structurally related forms of vitamin E occur in nature, four tocopherols and four tocotrienols, all of which are potent membrane-soluble antioxidants. In this study, we detected two major isoforms in sesame (Sesamum indicum L.) seed: γ-tocopherol and β-tocotrienol. The objective of this study is to investigate the genetic basis of these vitamin E isoforms. Methods We conducted a genome-wide association study (GWAS) using 5962 genome-wide markers, acquired from 96 core sesame accessions. The GWAS was performed using generalized linear (GLM) and mixed linear (MLM) models. Results LG08_6621957, on chromosome 8, was detected as having a significant association with γ-tocopherol in both models. It explained 20.9% of γ-tocopherol variation in sesame. For β-tocotrienol, no significant loci were detected according to the two models, but one locus, SLG03_13104062, explained 17.8% of the phenotypic variation. Based on structure and phylogenetic studies, the 96 accessions were clearly clustered into two subpopulations. Conclusion This study on sesame demonstrates and provides an evidence that genotyping by sequencing (GBS) based GWAS can be used to identifying important loci for small growing crops. The significant SNPs or genes could be useful for improving the vitamin E content in sesame breeding programs.

Study of the Non-Linearity on TiO2(0 0 1) Surface with Oxygen Defects: A First-Principles Study

Yuehua Dai,Xu Zhang,Chengzhi Ma,Zhiyong Pan,Feifei Wang,Wenjuan Lu,Jin Yang,Fei Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.8

First-principles plane-wave pseudopotential calculations were performed to study the energetics and electronic structures of oxygen defects on rutile TiO2(0 0 1). The influence of the material thickness on non-linearity (NL) was studied. With the increase in the thickness, the NL became stronger. Calculating the site-projected density of states by applying an external electric field showed that the NL of the bulk is due to the exchange of electrons between O 2p orbitals and Ti 3d orbitals. Finally, the influence of oxygen defects—oxygen vacancies (Vo), oxygen interstitials (Oi), and oxygen vacancies/oxygen interstitial (Vo + Oi) pairs (Frenkel pair defects)—on the NL of TiO2 was studied. These results demonstrate that the band gap (Eg) of TiO2 became gradually narrower as the electric field increased. The Stark effect and defects can lead to the splitting of degenerate energy levels. Stronger electric fields increase the band splitting and reduce Eg. With the increase in the Vo concentration, the decrease in the splitting amplitude and width of the energy level lead to weakening of the transfer of electrons between O and Ti atoms and optimizing the NL of TiO2. Therefore, the incorporation of Vo plays a significant role in improving the NL of TiO2.

Grid-Connected Dual Stator-Winding Induction Generator Wind Power System for Wide Wind Speed Ranges

Shi, Kai,Xu, Peifeng,Wan, Zengqiang,Bu, Feifei,Fang, Zhiming,Liu, Rongke,Zhao, Dean The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4

This paper presents a grid-connected dual stator-winding induction generator (DWIG) wind power system suitable for wide wind speed ranges. The parallel connection via a unidirectional diode between dc buses of both stator-winding sides is employed in this DWIG system, which can output a high dc voltage over wide wind speed ranges. Grid-connected inverters (GCIs) do not require booster converters; hence, the efficiency of wind energy utilization increases, and the hardware topology and control strategy of GCIs are simplified. In view of the particularities of the parallel topology and the adopted generator control strategy, we propose a novel excitation-capacitor optimization solution to reduce the volume and weight of the static excitation controller. When this excitation-capacitor optimization is carried out, the maximum power tracking problem is also considered. All the problems are resolved with the combined control of the DWIG and GCI. Experimental results on the platform of a 37 kW/600 V prototype show that the proposed DWIG wind power system can output a constant dc voltage over wide rotor speed ranges for grid-connected operations and that the proposed excitation optimization scheme is effective.

재한 중국인 유학생의 실패공포와 내현적 자기애가 학업지연행동에 미치는 영향

곽이문(Guo Yiwen),허비비( Xu Feifei),임현수(Lim Hyunsu),강진령(Kang, Jinryung) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.23

본 연구는 재한 중국인 유학생의 학업지연행동에 영향을 미치는 개인 내적 요인에 대해 탐색하는데 목적을 갖고 있다. 이를 위해 2016년 2월부터 3월에 걸쳐 서울특별시에 소재한 4년제 2개 대학의 중국인 유학생 214명을 대상으로 설문조사를 실시하 였으며, 회수된 자료는 SPSS 23.0을 이용하여 빈도분석 및 Pearson상관분석, 성별에 따른 차이를 보기위한 t-검증, 그리고 다중회귀분석을 실시하였다. 연구결과는 다음과 같다. 첫째, 재한 중국인 유학생의 실패공포, 내현적 자기애와 학업지연행동은 유의한 정적 상관을 나타냈다. 둘째, 재한 중국인 유학생의 실패공포와 내현적 자기애는 학업지연행동에 정적 영향을 미치는 것으로 나타났다. 셋째, 재한 중국인 여학생이 남학생보다 실패공포, 내현적 자기애, 그리고 학업지연행동의 정도가 전체적으로 높은 결과를 나타냈다. 이와 같은 결과는 실패공포와 내현적 자기애가 학업지연행동에 어떤 영향을 미치는지 과정을 설명하고 성별에 따른 차이를 확인하였다는 것, 그리고 중국인 유학생의 심리적 특성에 맞는 적합한 교육 및 학업상담을 제공하는 기초자료로써 본 연구의 의의가 있다. The purpose of the study is to find out the effects of fear of failure and convert narcissism on academic procrastination among Chinese students who study in Korean university. For this purpose, 214 Chinese student’s survey results were collected from whom studying at four-year universities two in Seoul. And statistical analysis was carried out using SPSS 23.0. From the beginning, both independent sample T-test and Pearson Correlation Coefficient (PCC) have been utilized to study the gender differences and correlation of fear of failure, covert narcissism of Chinese students, respectively. At the end, multiple regression analysis is used to validate the impact from fear of failure and covert narcissism on academic procrastination. The results of the study are as follows: Firstly, the research results indicates the meaningful correlations among fear of failure, convert narcissism and academic procrastination of Chinese students. Secondly, the research results of impact from fear of failure and convert narcissism on academic procrastination of Chinese students shows that the fear of failure and the covert narcissism both have positively impact on academic procrastination. Last but not least, according to the gender difference study, following meaningful results are achieved: Female students tend to have slightly heavier behavior in academic procrastination than male students and there are relatively more female students than male students in each sub factors of fear of failure and covert narcissism. based on these results, the importance and necessary is obvious to conduct a research according impact on academic procrastination from fear of failure and convert narcissism. And this study is meaningful as a basic data to provide appropriate education and psychological counseling for Chinese students who study in Korea.