Breeding of Tetraploid in Platycodon grandiflorum (Jacq.)A. DC. by Colchicine treatment

Kim,Ik-Hwan,Kim,Hag-Hyun,Hong,Eui-Yon,Yun,Jong-Sun,Yun,Tae,Hwang,Ju-Kwang,Lee,Cheol-Hee 한국자원식물학회 2003 Plant Resources Vol.6 No.3

Present studies were carried out to produce tetraploid plants by colchicine treatment using seeds, seedlings and shoot tips of Platycodon grandiflorum in Campanulaceae. The most successful colchicine treatment for tetraploid production in P. grandiflorum was soaking treatment using 0.01 and 0.5% colchicine solution for 1 hour and 12 hours, respectively. Morphological characteristics of both diploid and tetraploid were similar, but tetraploid plants had more leaves. Compared to diploid, tetraploid had the larger stomata, but less number of stomata. Fresh weight of tetraploids was 20∼40% heavier than that of diploid.

Breeding of Tetraploid in Codonopsis lanceolata (Sieb. et Zucc.) Trautvetter by Colchicine Treatment

Kim,Ik-Hwan,Kim,Hag-Hyun,Hong,Eui-Yon,Yun,Jong-Sun,Yun,Tae,Hwang,Ju-Kwang,Lee,Cheol-Hee 한국자원식물학회 2003 Plant Resources Vol.6 No.3

Present studies were carried out to produce tetraploid plants by colchicine treatment using seeds, seedlings and shoot tips of Codonopsis lanceolata. Three tetraploid plants of C. lanceolata were produced from seeds which absorbed 0.1 % colchicine solution for 12 hours, and 0.5% colchicine solution for 1 and 6 hours from seedlings, respectively. But tetraploid was not produced from shoot tips treated by colchicine solution. Compared to diploid, tetraploid plants had larger stomata, but less number of stomata. Fresh weight of tetraploid plants was 1.4∼3.6 times heavier than diploid plants.

강원도 원주지역 초·중·고등학생의 식습관 및 섭식행동에 관한 단면연구

허혜경,박소미,김기연,김춘배,안정숙,송희영,김기경 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.1

Purpose : The purpose of this study was to investigate the dietary habits of students in order to identify risk groups according to their Body Mass Index (BMI), and to compare the eating behavior of students in the normal range (19<I≤24) and those in risk groups (BMI≤19, 24<I≤27, BMI>). Method : 1176 elementary school students, 850 middle school students and 672 high school City, were the participants The instrument for this study was a structured questionnaire that included demographic data as well as dietary habits, and the eating behavior instrument developed by Stunkard &essick(1985) and revised by Kim &im (1997). Result : 1) As students moved up in grade level their dietary habits became more irregular and the degree that students chewed food was reduced 2) As students moved up in grade level, a greater number of the students did not eat breakfast. The reasons given were that there were not enough time before classes started(40.4%) and a lack of appetite in the morning(10.6%) in high school students. 3) As for supper, from 67.8 to 81.9% of subjects reported having regular supper. However the rest of the subjects did not eat supper because of anorexia and fear of weight gain. 4) The results identified risk groups according to their BMI showed that for elementary school students, 55.9% were in the low weight group, 5.5% in the overweight group, and 0.9% in the obese group. For middle and high school students, 40.6% and 35.5% respectively were in the low weight group, 7.4% and 6.3% in the overweight group, and 4.1% and 2.5% the obese group. 5) Comparisons of the eating behavior of students in the normal weight group with that of those in the three risk groups showed that there were significant differences in 'hunger' and 'cognitive restraint of eating' in elementary school students, and significant differences in 'cognitive restraint of eating' in middle and high school students. Conclusion : The results of this study show that management of diet in school health sholud be addressed from both the aspect of lack of nutrition and that of excess nutrition. In other words, good diet is as important for students in the low weight group as it is f3r those in the overweight and obese groups. The estatblishment of good dietary habits and eating behavior in students, by nurses and dieticians should be done by providing repeated diet education and involvement in diet counseling.

초음파 주파수와 음향밀도에 따른 하수슬러지 전처리 특성

김대용,정연화,김한석,정진희,성낙창 東亞大學校 建設技術硏究所 2008 硏究論文集 Vol.31 No.2

The objective of this study was to investigated the pretreatment characteristics of sewage sludge by ultrasonic process. Excess sewage sludge was sampled from N sewage treatment plant (STP) in B city. The ultrasonic processor was designed to operate with 28 kHz and 40 kHz,independently. During sonication experiment, sludge samples were stirred by agitator. The acoustic densities were changed 33 to 139 W/L by control of current strength. The sonication time was in the range of 10 min and 40 min. The total chemical oxygen demand (TCOD) and soluble chemical oxygen demand (SCOD) of sludge were analyzed with K2Cr207 Closed Reflux Method. The results showed that sonication with 28 kHz of acoustic frequency is better than sonication of 40 kHz in incensement of SCOD/TCOD ratio. Also, the sludge solubilization rates increased as the sonication time and acoustic density increased. The application of dual frequency sonication for sludge pretreatment can be interest for sewage treatment plants having problems in sludge treatment and disposal.

Bayesian Estimation of the Ratio of Two Means using Dirichlet Process Prior

Kim,Hee-Jae,Won,Ho-Yon 한국자료분석학회 2001 Journal of the Korean Data Analysis Society Vol.3 No.4

In the past, there have been computational difficulties with the model which adapted the Dirichlet process prior. However, using the MCMC, computational difficulties can be solved. In this paper, the populations of interest is the ratio of two exponential populations and two Poisson populations. The Dirichlet process prior is used to provide a nonparametric Bayesian estimate of a ratio of two means. The proposed procedure is applied to some real and artificial examples, and compare it with classical estimator.

중세 남녀 속옷의 특성

김주애,이연희 服飾文化學會 2003 服飾文化硏究 Vol.11 No.2

This study analyzes how social environment infuenced underclothes and characteristic which underclothes have is associated with the outer garment and the underclothes in the Middle Ages. As a result, I can get the next conclusion First, throughout the Middle Ages, body was involved with the sense of same and sin influenced by the religious austerity. This mentality was applied to the underclothes. As underclothes are not generally revealed, it is recognized to be not important but inefficient. Second, in the late Middle Ages, as the outer garment reveal the body line, the underclothes are affected by it. So men's and women's distinction in the outer garment is applied to the underclothes. In the second quarter of the 14C, class distinction and sexual attraction certainly present on the outer garment but are not applied to the underclothes. The conception that underclothes might express the spirit of the changing times, in sympathy with the outer garment, did not enter the medieval mind. Third, the function of protect the body is emphasized the underclothing in the Middle Ages, whereas it was important to identify rank sign in the histroy of underclothes. Throughout the Middle Ages the underclothing of both sexes is emphasized utilitarian in function rather than class distinction and sexual attraction. But women exposed their body line in thin chemise to represent sexual attraction in the late Middle Ages.

개에서 심실 조율부위 및 조율주기에 따른 혈역학적 변화

김희열,김재형,노태호,김종진,진승원,유기동,이만영,채장성,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.9

설문조사자료의 분석을 위한 통계페키지의 활용

김희재,원호연 慶星大學校 1988 論文集 Vol.9 No.2

The purpose of this study is to compare SPSS with SAS, the statistical package, about the treatment difference analysis, the regession analysis, the correlation analysis and analsis of variance of the assumption that the following was normally carried out the establishment method of a question, establishing samples, deciding sample size and examination method. And this study is to show the appropriate selection and applications of statistical package and optimum analysis method about statistical data which was surveyed.

전기자동차 운전을 위한 직류타여자 전동기의 쵸퍼제어

한경희,강승욱,김용주,정연택,이승환 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-

Recently, the speed control of electric motorcar usually adapts the chopper control method by the development of power electronics and semiconductor manufacturing techniques. When the chooper control is adapted to the speed control of electric motorcar. D.C.series motor is mostly used because of the large starting torques and good control characteristics. But with respect to the economy, D.C. separately excited motor with shunt characteristics is profitable because of high adhesivesness and consumption. So, we compare the characteristics of the bilateral variable-ratio chopper controlled D.C. separately exited motor with that of the D.C. series motor theoretically and experimentally, and present the method which is able to simplify the main chopper circuit by selecting among the forward powering, forward regenerative braking, backward powering, and backward regenerative braking only by using the main chopper control signal. Also, control method is studied which has similar driving characteristics to that of the gasoline motorcar.

질소-프로판-공기 분위기에서 유동상 침탄 특성

黃龍吉,李相和,金榮熙 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1

The effect of air : propane ratios on the microstructure of carburized layers, internal oxidation characteristics and carburizing atmospheres during fluidized-bed carburizing under the nitrogen-6% propane base atmosphere were investigated At air : propane ratios less then 3 : 1 carbon potential of fluidized bed carburizing at mosphere was shown to be settled down to good carburizing condition, while carbon potential was shown to be decreased abruptly and CO₂ content increased exceedingly at air : propane ratios greater than 3 : 1. Under the same carburizing condition, the effective case depth of the carburized specimens decreased with Nicontent. At the given ratio of air to propane, the depths of internal oxidation layer appered to be increased almost linearly as carburizing time and the total contents of Si, Mn and Cr of steel increased. For air : propane ratios less than 3 : 1 at 930℃ it was concluded that the most effective carburizing condition and the control of internal oxidation could be obtained easily.