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다래(Actinidia arguta)의 揷木에 관한 硏究
沈慶久,安永熙,黃重樂 成均館大學校 1982 論文集 Vol.32 No.-
Actinidia arguta PLANCH, native to mountains and wooded areas of Korea, are expected as edible landscape plants. Actinidia arguta are perenial and deciduous climbing plants with flesh leaves and strong vines, and flowered from May to June and matured from September to October. It is recommened that cuttings should be taken from the one-year-old stem after maturation. A percentage of successful propagation by cuttings has not yet studied in detail. This objective of this study was conducted to investigate the potential of Pergola materials of wild Actinidia arguta, and to determine the influence of rooting hormone and H_2SO_4 on the rooting of shoot cuttings and to compare female and male plants in rooting. Only cutting of one-year-old stems were collected for this experiment, Rooting beds in a green house were filled with vermiculite and installed the electric wires for heating under the beds. Rooting beds were closed with polyethylen film to maintain temperature and humidity. The results are summarized as follows. The rooting percentage of male plants are higher than that of female plants. The male plants cuttings tended to have the largest root systems in the colsed bed. The highest rootlet numbers resulted with higher concentration of auxin-treated cuttings. for 30 sec. Cuttings treated with IBA 1000ppm rooted better and had larger root systems than other hormone treatment combinations.
다래 密閉揷木時 發根促進劑 處理와 揷木床 溫度差異가 發根에 미치는 影響
沈慶久,安永熙,黃重樂,李基誼 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.1
Bowers(Actinidia arguta planch) grow widely in the mountains of Korea. This deciduous vine is now considered worth while to exploit as an outstanding edible landscape plant. The present study was carried out to find out the suitable propagation method of bowers For this experiment, cuttings were taken from the one-year-old stem. Rooting beds in a green house were filled with vermiculite and installed with the electric wires for heating under the beds. Rooting bed were closed with polyethylene film to maintain temperature and humidity. The results obtained are summarized as follows. The rooting percentage and rootlet number of male plant are higher than that of female plant. The male and female plants cuttings tended to have the largest root system in the 20±2℃ cutting bed. Cuttings treated with IBA 500ppm 30 secdip rooted better and larger root systems than other treatments. The rooting percentage, length of root and rootlet number in the 20±2℃ bed temperature was higher than those in the 15±2℃.
Adjustments of Dispersion Statistics in Extended Quasi-likelihood Models
Choong Rak Kim(김충락),Mee Seon Jeong(정미선) 한국통계학회 1993 응용통계연구 Vol.6 No.1
본 논문에서는 과산포 혼합 모형인 음이항 분포와 베타이항 분포에서 피어슨 형태 및 데비언스 형태의 분산치 교정에 대한 효과를 수리적으로 비교했다. 이들 과산포 혼합 모형은, 평균과 분산을 동시에 모형화 하는데 매우 유용한 준우도함수의 중요한 구성원이다. 모의실험을 통해서 분산치의 교정이 평균, 산포모수에 따라 어떻게 달라지는지 비교 연구하였다. In this paper we study numerical behavior of the adjustments for the variances of the Pearson and deviance type dispersion statistics in two overdispersed mixture models; negative binomial and beta-binomial distribution. They are important families of an extended quasi-likelihood model which is very useful for the joint modelling of mean and dispersion. Comparisons are done for two types of dispersion statistics for various mean and dispersion parameters by simulation studies.
Extended Quasi-likelihood Estimation in Overdispersed Models
Kim, Choong-Rak,Lee, Kee-Won,Chung, Youn-Shik,Park, Kook-Lyeol The Korean Statistical Society 1992 Journal of the Korean Statistical Society Vol.21 No.2
Samples are often found to be too heterogeneous to be explained by a one-parameter family of models in the sense that the implicit mean-variance relationship in such a family is violated by the data. This phenomenon is often called over-dispersion. The most frequently used method in dealing with over-dispersion is to mix a one-parameter family creating a two parameter marginal mixture family for the data. In this paper, we investigate performance of estimators such as maximum likelihood estimator, method of moment estimator, and maximum quasi-likelihood estimator in negative binomial and beta-binomial distribution. Simulations are done for various mean parameter and dispersion parameter in both distributions, and we conclude that the moment estimators are very superior in the sense of bias and asymptotic relative efficiency.
Detecting Influential Observations on the Smoothing Parameter in Nonparametric Regression
Kim, Choong-Rak,Jeon, Jong-Woo The Korean Statistical Society 1995 Journal of the Korean Statistical Society Vol.24 No.2
We present formula for detecting influential observations on the smoothing parameter in smoothing spline. Further, we express them as functions of basic building blocks such as residuals and leverage, and compare it with the local influence approach by Thomas (1991). An example based on a real data set is given.
Variable Selection Criteria in Regression
Kim, Choong-Rak The Korean Statistical Society 1994 Journal of the Korean Statistical Society Vol.23 No.2
In this paper we propose a variable selection criterion minimizing influence curve in regression, and compare it with other criteria such as $C_p$(Mallows 1973) and adjusted coefficient of determination. Examples and extension to the generalized linear models are given.
Score Tests for Overdispersion
Kim, Choong-Rak,Jeong, Mee-Seon,Yang, Mee-Yeong The Korean Statistical Society 1994 Journal of the Korean Statistical Society Vol.23 No.1
Count data are often overdispersed, and an appropriate test for the existence of the overdispersion is necessary. In this paper we derive a score test based on the extended quasi-likelihood and the pseudolikelihood after adjusting to the Bartlett factor. Also, we compare it with Levene (1960)'s F-type test suggested by Ganio and Schafer (1992).