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차나무(Camellia sinensis)에서 剪枝처리의 强度와 時期가 생육 및 품질에 미치는 영향
이진호(Jin-HO Lee) · 이민석(Min-Seuk Lee) · 이정대(Jung-dae Lee) · 유주(Ju Yoo) · 김영걸(Young-Gul Kim) 한국차학회 2006 한국차학회지 Vol.12 No.2
Pruning is one of the most effective techniques in the tea cultural practice that controls the formation of trunks and branches. In order to find out the suitable intensity and time for pruning, we had tea plants pruned at two different times varying the pruning intensity : tea plants were first pruned at a height of 50cm, 60cm, and 70cm from the surface of the earth respectively on May 30th, 2004, which was 15 days later after the first tea crop, and the second pruning was done at a height of 50cm, 55cm, 60cm, and 65cm from the surface of the earth on July 11th, 2004, 15 days later after the second tea crop. According to the experiment, the more intensive pruning was, the longer bud length and the more opened leaves we could get regardless of the time. It also showed the result that as a pruning position was lowered, the sprouting rate got higher. In addition, the first tea crop showed a lower response to higher pruning intensity, while the yield at the unit area(20cm 20cm) increased except 50cm pruning after the second tea crop. Finally, both the whole and unit area yield turned out to be low when pruned below 50cm after the second tea crop. Therefore, it is considered as a noneffective pruning condition. In conclusion, varying pruning conditions is not recognized to affect on the quality of the first tea crop, because there is no meaningful correlation between chemical component content of tea leaves and different pruning conditions.
NPC 인버터 시스템에서 개방성 고장시 PWM 특성을 이용한 새로운 고장 검출 방법
李正大(Jung-Dae Lee),金兌珍(Tae-Jin Kim),河東鉉(Dong-Hyun Ha),玄東石(Dong-Seok Hyun) 대한전기학회 2008 전기학회논문지 Vol.57 No.7
In this paper, a novel fault detection method is proposed when the neutral-point-clamped inverter has a open-circuit fault in the switching device. This proposed method is configured with simple circuit and is achieved by a simple algorithm using the inherent characteristic of the continuous Pulse Width Modulation. Also, this method has the fast fault detection ability and is much simpler to embody, in comparison with conventional fault detection methods. This ability to detect fault minimizes harmful effect which are such as DC-link voltage unbalance and overstress to other switching devices. Therefore, this proposed fault detection method can improve reliability of NPC inverter system. Experimental results are presented to verify the validity of proposed fault detection method.
태권도의 집단 공동적, 개연적, 권력 집중적, 남성 중심적 문화양상에 관한 연구
이정대 ( Jeong Dae Lee ),Todd Gilson,이봉 ( Bong Yi ) 국기원 2010 국기원태권도연구 Vol.1 No.2
태권도는 주로 겨루기, 격파, 품새, 기타 호신술 등을 통하여 태권도가 나타내고자 하는 육체, 정신, 사회적 자아의 수련 이미지를 표출하고 있다. 본 연구 포괄적으로 태권도 수련의 사회학적 이해를 넓히는 데 그 목적이 있으며 이를 통하여 태권도에서 나타날 수 있는 제반 사회문화적 현상, 특히 전통적인 여러 특이 양상들은 물론 성(性; gender) 혹은 남성성에 관한 현상들에 관하여 비판론적(critical) 접근방법을 통해 그 사회학적 이해를 넓히고자 하는 데 궁극적 목적이 있다. 이와 같은 연구 목적을 얻고자 미 중서부 미시건지역의 한 대학 태권도 수업과정에 참여하였고 참여관찰법과 설문법을 사용하여 다양한 사회문화적 양상들을 함께 얻어낼 수 있었다. 결과적으로 태권도 수련을 통하여 타(서구) 스포츠와 구분되어지는 집단 공동적(collectivistic), 개연적(probabilistic), 권력 집중적(power-centered), 그리고 남성 중심적(masculine)인 사회문화적 양상들이 표면적으로 다양하게 표현되고 있음을 확인하게 되었고 태권도를 통해 볼 수 있는 이러한 사회문화적 양상들이 어느 특정 사회집단에 지양 혹은 배타적이 될 수 있는 보수적인 형태로 유지되고 있음을 본 연구는 밝히고 있다. Taekwondo is often showcased with sparring, breaking, forms, and some other types of self-defense skills to demonstrate the primary images of Taekwondo disciplines on physical, mental, and social oneself. The study has conducted a critical examination of what consider as cultural productions in the lineage of the contemporary social patterns as presented and expressed through Taekwondo as to socio-cultural traditions, gender, and masculinities. The purpose of the study was to aid Taekwondo practitioners to become more reflective and critical to the sociological realm of human relationships in their sport as a humane sport activity for all regardless of any social statuses. For the study, regular Taekwondo club classes were observed at a mid-Michigan university for a one-semester term. During the study, formal interviews were also conducted to examine the socio-cultural traditions, gender, and masculinities in Taekwondo. As a result, the distinctive features of Taekwondo were demonstrated with many unique collectivistic, probabilistic, power-centered, and masculine aspects of culture. Along with more in-depth analyses on the findings, it is suggested that Taekwondo explicitly maintains many traditional features with its employment of cultural conservativeness.
은행지점의 입지특성 및 점포특성이 매출에 미치는 영향에 관한 연구
이정대(Lee, Jeong-Dae),김재태(Kim, Jae-Tae) 한국주거환경학회 2014 주거환경(한국주거환경학회논문집) Vol.12 No.3
Recently, banks are going through the reduction or relocation to strengthen its competitiveness. However, since face to face business activities are the most important role in bank, reduction can not be determined easily. So, this research aims to guide basic data about closing and opening strategy of the bank by analysing how much the Locational Characteristic and Store Characteristic of bank affects sales. In this research, we used multiple regression analysis and the objects are 138 banks in Bundang and Pangyo new city. The dependent variable, sales, is based on the 2012 data and independent variable is categorized into population, store, economy, land, location and access characteristics. As a result, first, bank branch needs at least 3 years of settlement period after opening. Second, the sales decreases when the distance from the subway station is too close or the subway user is too much. Third, when the distance from the large shopping center or community service is close, the bank sales tend to increase. Forth, population does not seem to affect the increase of sales. This result can be used for the opening and closing of bank branches for basic data.
BLDC 전동기 운전 특성을 이용한 새로운 고장 검출 기법 구현
이정대(Jung-Dae Lee),박병건(Byoung-Gun Park),김태성(Tae-Sung Kim),류지수(Ji-Su Ryu),현동석(Dong-Seok Hyun) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a novel sensorless fault detection algorithm for a brushless DC(BLDC) motor drive system. This proposed method is configured without the additional sensor for fault detection and identification. The fault detection and identification are achieved by a simple algorithm using the operating characteristic of the BLDC motor. This proposed method can also be embedded into existing BLDC motor drive systems as a subroutine without excessive computational effort. The feasibility of a novel sensorless fault detection algorithm is validated in simulation.