회전자에 정류회로를 가지는 유도전동기의 교류회로 모델에 의한 해석

문경주,조용철,좌종근 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2

In this paper. the characteristics of induction motor which has rotor rectifier circuit are analyzed using a new six elements ac model. The effects of resistance on dc circuit which are caused by current over lap angle and voltage drop of rectifier are considered in the proposed model for this analysis. The proposed model and Sen's five elements ac model which is not considered these effects are used to analyze. and the analyzed results are compared with the experimental results in order to verify the proposed model. It is found that the results of the proposed method are good agreement with the experimental results.

2차측에 정류회로를 이용한 유도전동기의 불평형 전압 운전해석

문경주,조용철,좌종근 濟州大學校 情報通信硏究所 1999 情報通信硏究所論文集 Vol.2 No.-

The Characteristics of unbalanced voltage operation for induction motor which has rectifier circuit in the secondary side are analyzed using a six elements ac circuit model referred to the primary side. The symmetrical component method is used to analyze motor performance and the positive and negative sequence circuit model are composed by taking account of the current overlap angle and the voltage drop of rectifier circuit. The characteristics of induction motor under unbalanced symmetrical voltage are computed and compared with the measured values to verify the proposed method

회전자에 정류회로를 가지는 유도전동기의 교류회로 모델에 의한 해석

조용철,좌종근,문경주 濟州大學校工科大學産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.2

In this paper, the characteristics of induction motor which has rotor rectifier circuit are analyzed using a new six elements ac model. The effects of resistance on dc circuit which are caused by current over lap angle and voltage drop of rectifier are considered in the proposed model for this analysis. The proposed model and Sen's five elements ac model which is not considered these effects are used to analyse. and the analyzed results are compared with the experimental results in order to verify the Proposed model. It is found that the results of the proposed method are good agreement with the experimental results.

발달장애학생을 위한 웹기반 의사소통능력신장 프로그램의 개발과 적용 사례

김동현,유영환,김좌중,천경철,이청용,김봉수 국립특수교육원 2005 연구보고서 Vol.- No.10

발달장애학생의 의사소통능력은 단순한 언어문제 이상의 의미를 지닌다. 의사소통능력은 모든 학습의 기초가 되고 결국 인간의 삶의 질을 좌우하게 하는 중요한 요소가 되고 있기 때문에 의사소통능력에 문제가 많은 발달장애학생에게 있어서 의사소통능력 신장은 매우 중요하다. 발달장애학생의 언어 및 의사소통능력의 결함은 사회적 결함과 인지적 결함에 상호 관련성이 있어 다른 사람으로부터의 의사소통을 이해하는 능력과 자신의 생각을 표현하는 능력이 제한되어 다른 사람과의 상호관계를 맺는데 어려움이 많았다. 따라서 발달장애학생의 언어지도는 생활 장면에서 교수하는 것이 가장 바람직하다고 하겠다. 그러나 지금까지 주로 활용된 전통적인 언어지도 방법은 어휘를 증가시키고, 발화의 길이를 널리는 데는 효과가 있었지만, 학습된 내용을 생활 장면에서의 일반화에는 문제점이 있는 것으로 지적되고 있다. 발달장애학생의 언어지도 방법은 일상생활 속에서 학습 내용을 선정하고 이를 실생활 장면 혹은 이와 유사한 환경에서 효과적으로 지도할 수 있는 적절한 교수 방법이 필요하다. 그래서 발달장애학생의 의사소통능력 신장을 위한 환경중심 언어지도 방법을 활용한 웹(Web)기반 언어지도 프로그램을 개발하였다. 웹(Web)기반 언어지도 프로그램은 제7차 특수학교 기본교육과정과 국립특수교육원에서 발간한 ‘발달장애학생의 언어교육 프로그램(1998)’ 분석을 통하여 개인 · 가정생활, 학교 · 사회생활, 경제 · 여가생활 등의 6개 영역으로 구분하여 각 영역별 학습주제를 선정하였으며, 학습주제에 대한 학습의 진행 형태는 학습목표, 낱말학습, 상황학습, 평가로 진행할 수 있도록 하였으나, 학습자의 현재 수행 능력을 고려하여 능력에 따른 진행의 절차를 학습자가 선택할 수 있게 하였다. 본 프로그램을 적용해본 결과 다음과 같은 교육적인 효과를 얻을 수 있었다. 첫째, 웹을 활용한 가상체험을 통하여 적극적이고 흥미 있는 참여를 유도하며, 학습자 중심의 주도적인 학습과 안내자, 촉진자로서의 교사의 역할을 통해 발달장애학생의 의사소통 능력을 신장시킬 수 있었다. 둘째, 교실에서 이루어지는 지금까지의 수업방식을 탈피하여 학습자가 언제, 어디서나, 누구든지 학습할 수 있는 열린 학습체제의 교육환경을 조성할 수 있었다. 셋째, 문자정보, 그래픽, 애니메이션, 사진, 음성, 비디오 등 다양한 형태의 정보가 상호대화 형식으로 활용되며, 수준별 반복학습을 실시함으로써 교수-학습 방법의 개선뿐만 아니라 양질의 수업을 진행하는데 도움을 줄 수 있었다. 본 프로그램을 활용한 언어지도가 발달장애학생의 의사소통능력 신장을 위한 최선의 방법이라고 말할 수는 없으며, 언어지도의 한 가지 방법이라고 말할 수 있다. 따라서 본 프로그램의 활용한 언어지도는 학교에서 교사가 학생의 능력과 흥미를 고려하여 지도한다면 발달장애 학생의 의사소통능력 신장에 많은 도움이 될 것이다. The developmental disability of the metal handicapped children means more than simple linguistic problem. The developmental disability is the base of all the learning and important factor which decides the happiness of the human being finally, so the extension of mutual understanding ability is so important, in the case of the metal handicapped children who have a problem of the mutual understanding ability. In the case of the metal handicapped children, the defects of the mutual understanding and linguistic ability are related with the social defect and the defect of recognition, and the ability of understanding about mutual relations with other people and self-expression ability are limited. So they have many problems in mutual relations with other people. Therefore, the linguistic instruction of the metal handicapped children is recommended to be done in the living. But, the traditional linguistic instruction which's used mainly as yet, is effective in increase of a vocabulary and the length of a locutionary act, but it has a problem in the popularization of the learning in the real life. The method of the linguistic instruction for the metal handicapped children, should be selected as contents in the real life, and the right learning method which can be done under the real life or the similar environment with it, is needed. Because of the above realities, the linguistic teaching web-based program is developed, using the linguistic instruction which is focused on the environment, for the extension of the mutual understanding ability of the metal handicapped children. In the linguistic teaching web-based program, it is divided with 6 field (personal · home life, school · social life, economical · leisure life) and the educational subject classified by each field is selected, by the analysis of 'The linguistic educational program for the children who have developmental disability' published by the 7th basic education course of special school and the national special education organization. Besides, the progress form of learning about the educational subject is directed by educational goal, word learning, situation learning and valuation, but a learner can choose a procedure followed by ability, regarding to his accomplishment ability. As the result of the application of this program, the educational effects that we could get are the following : 1. We could lead a positive and interesting participation by virtual experience through WEB, and the communication ability of the metal handicapped children was extended by a role of a teacher, as a guide and promoter and a leading learning focused on a learner. 2. The teaching method which is done in school now, is dismissed and we could form the educational environment of the learning system that a learner could learn, without distinction of time, a place and a person. 3. The various form of information, like text, graphic, animation, photo, sound, video and so on, is applied as a form of communication. Therefore, the program was useful in not only the improvement of the teaching-learning method, but also the proceeding of the effective lesson. The linguistic teaching which use this program, can not be the best method of the extension of the mutual understanding ability and it's just one method of linguistic teaching. if the linguistic teaching which use this program is conducted, regarding to a ability and a interest of a student, it will be so useful in the extension of the mutual understanding ability, for the children who have developmental disability.

Calcium Distribution and Relationship between Calcium and Oxalic Acid in Cucumber Plant by Calcium Levels

Jwa-Kyung Sung,Su-Youn Lee,Seong-Yong Park,Ju-Young Lee,Byong-Choon Jang,Beom-Heon Song 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04

We carried out to better understand calcium behavior in plant growing in media with different calcium levels, deficiency (3), normal (1), and surplus (3). Growth of cucumber plants did not appear significant difference among calcium levels by 7 days after transplanting, but growth rate at 14 days was the highest in normal and followed deficiency and surplus. Increase in calcium concentration treated resulted in not only an excessive Ca uptake of plant but also a proportional decrease in Mg contents. In addition, excessive absorbed Ca was preferentially accumulated in stem and root to avoid leaf damage. Oxalate playing a role as a mediator of excessive Ca through Ca-oxalate crystal formation in cell was analyzed. Oxalate content in leaves was proportionally increased with an increase in calcium level in media, and the correlation coefficient was 0.94(>0.001), while Ca and oxalate in stem and roots did not show significant relation. Ca-oxalate crystal isolated from different Ca-treated leaves and stem was observed using SEM-EDX. Large amount of Ca-oxalate crystal was formed with an increase in Ca concentration. This means that excessive Ca in cell is immobilized through the formation of Ca-oxalate crystal with oxalate bio-synthesized.

Effect of Nitrogen on Cell Dynamics at Leaf Growth Zone in Two Rice Varieties

Jwa-Kyung Sung,김태완,이철원,송범헌,Seon-Woong Hwang 한국작물학회 2004 Korean journal of crop science Vol.49 No.3

In plants, nitrogen is the major component for growth and development except for carbon. Leaf growth is based on the division, elongation and maturation of cells, which are consisted of epidermis, mesophyll, bundle sheath, xylem, phloem and so on. Dynamics of these tissues related with nitrogen are required for better understanding. This experiment was begun to evaluate nitrogen effect on the elongation of epidermal and guard cell of two rice (Oryza sativa L.) varieties, Seoanbyeo and Dasanbyeo on May 2000 at Chungbuk national university in Cheongju. After transplaning 15-day-old seedlings into a/5000 pots, the main characteristics related with cell elongation were investigated and evaluated. A maximum leaf length reached to 7 or 8 days after emerged from the collar, and also the leaf elongation rates were greatly affected by increase of N application. The initial and final cell length were about 17 and 130 , respectively. Cell division occurred within 1.0mm from leaf base. In 22kg-N, cells produced a hour were 1.5 to 1.9 and 1.2 to 1.3 fold increased compared to the non-N and 11 kg-N, respectively. At 22 kg-N, cell enlargement of epidermal and guard cell was finished within about 20 (Seoanbyeo) and 15 hours (Dasanbyeo), while it took much time, about 30 hours.

The Releasing Pattern of NH₄⁺ and NO₃⁻ from Organic Materials

Jwa-Kyung Sung(성좌경),Sang-Min Lee(이상민),Yong-Hwan Lee(이용환),Du-Hoi Choi(최두희),Gab-Hee Ryu(류갑희),Tae-Wan Kim(김태완),Beom-Heon Song(송범헌) 한국토양비료학회 2006 한국토양비료학회 학술발표회 초록집 Vol.2006 No.5

Phenolic Compound and Weed Occurrence in Cover Crop-Incorporated Soil

Jwa Kyung Sung,Jun Ga Jung,Sang Min Lee,Yong Hwan Lee,Du Hoi Choi,Tae Wan Kim,Beom Heon Song 한국육종학회 2007 한국육종학회 학술발표회 발표요지 Vol.39 No.-

Effect of UV-B Radiation on the Leaf Growth of Rice Seedling

Jwa-Kyung Sung(성좌경),Su-Yeon Lee(이수연),Tae-Wan Kim(김태완),Seon-Woong Hwang(황선웅),Moon-Hee Park(박문희),Beom-Heon Song(송범헌) 한국토양비료학회 2004 한국토양비료학회지 Vol.37 No.1

The Appraisal for the School Based Tooth Brushing Program Though Establishing the Tooth-Brushing Unit at the School

Jwa, Su-Kyung 대한임상예방치과학회 2010 International Journal of Clinical Preventive Denti Vol.6 No.1

Objective: According to this policy, the public health center at Jung-Gu in Seoul city has decided to extend the school toothbrushing programs from 1 school to 4 schools in 2,008, and tried to appraisal every year. According to this appraisal plan, the author has performed the oral health survey for schoolchildren by checking the variations for caries an oral health or hygiene states in before and 6 months after the program in order to correct unreasonable points and to suggest the proper directions for improvement of oral health for school children. Materials and Method: 3 Primary school children of the 1st and 6th grade were joined as experimental groups and 1 school for control. 382 of the total subjects were selected among the 1st and 6th grade students who has no problems for systemic diseases or orthodontic appliance. Oral exams were done both in control group and 3 of the experimental groups, with the interview for questionnaires about the toothbrushing habits, for 2 times as before and 6months after the program at each school, in the period of May to December, in 2009. Results and Conclusion: There was no significant difference in caries experience both in permanent and deciduous dentition, in 1st grade and 6th grade between 3 experimental group and 1 control group with the equipping various type of toothbrushing unit. It revealed a little bit less in PMA, S-PHP and Snyder test in 6 months later of school based toothbrushing program both in 1st grade and 6th grade, in experimental group than in control group, but it was no significant difference in statistical (p>0.05). The frequency of toothbrushing was the most in Bongrae school, floor type toothbrushing unit, both in 1st grade and 6th grade, otherwise the most frequency for visiting at the toothbrushing unit in Namsan school, as the continuous performing the program for 4 years. There was no significant difference for visiting at the toothbrushing unit between the type of the unite, in 1st grade, but more of frequency in Kwanghee school as classroom typed than in Kwanghee school, newly established with the toothbrushing unite than in Bongrae, as with the floor typed in 6th grade student (p<0.05). The frequency of toothbrushing after lunch, was the most in Namsan school, continuos program performing, compared with the newly established toothbrushing unit, as Kwanghee and Bongrae school (p<0.05). It was recommended that toothbrushing unite would be established with the room type and it should be needed the toothbrushing instruction under the supervision of the school teacher or nurse with continuously, in order to promote the oral hygiene and health.