GH-Bladed를 이용한 풍력발전기의 질량 불평형 및 공력 비대칭 특성 분석

문대선(Dae Sun Moon),김성호(Sung Ho Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5

소형 풍력발전기의 MPPT 제어 실험을 위한 장비 개발

문대선(Dae-Sun Moon),육의수(Ui-Su Yuk),김성호(Sung-Ho Kim) 한국유체기계학회 2010 한국유체기계학회 학술대회 논문집 Vol.2010 No.12

칼만필터 및 인공신경망에 기반한 가변속 풍력발전 시스템을 위한 비선형 제어기 설계

문대선(Dae-Sun Moon),김성호(Sung-Ho Kim) 한국지능시스템학회 2010 한국지능시스템학회논문지 Vol.20 No.2

최근 풍력발전 시스템은 가장 빨리 발전하고 있는 신재생 에너지원중 하나로 각광을 받고 있으며, 풍력발전 시스템의 주된 관심사는 어떻게 광범위한 풍속의 변화에서도 효율적으로 시스템을 동작시키는 가에 있다. 가변속 풍력발전 시스템은 고정속 풍력발전 시스템에 비해 더 높은 에너지 효율, 낮은 컴포넌트 스트레스를 달성할 수 있다는 장점을 갖는다. 일반적으로 가변속 풍력발전 시스템의 제어를 위해서는 풍속정보의 취득이 필수적으로 요구된다. 하지만 풍속계 등에 의해 측정된 풍속은 여러 요인에 의해 정확하지 않다는 문제점을 갖는다. 이에 본 연구에서는 풍속의 추정을 위한 칼만 필터와 칼만 필터에 의해 추정된 정보를 사용하여 학습된 인공신경망으로부터 최적의 로터 회전 속도를 유추할 수 있는 새로운 형태의 가변속 풍력발전 시스템을 위한 제어 알고리듬을 제안하고자 한다. 또한 Matlab의 시뮬링크를 사용하여 다양한 시뮬레이션 수행하여 제안된 기법의 유용성을 확인하고자 한다. As the wind has become one of the fastest growing renewable energy sources, the key issue of wind energy conversion systems is how to efficiently operate the wind turbines in a wide range of wind speeds. Compared to fixed speed turbines, variable speed wind turbines feature higher energy yields, lower component stress and fewer grid connection power peaks. Generally, measurement of wind speed is required for the control of variable speed wind turbine system. However, wind speed measured by anemometers is not accurate owing to various reasons. In this work, a new control algorithm for variable speed wind turbine system based on Kalman filter which can be used for the estimation of wind speed and artificial neural network which can generate optimum rotor speed is proposed. Also, to verify the feasibility of the proposed scheme, various simulation studies are carried out by using Simulink in Matlab.

풍력발전기를 위한 신경망 기반의 풍속 추정 및 MPPT 기법에 관한 연구

문대선(Dae-Sun Moon),김성호(Sung-Ho Kim) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.2

최근 풍력발전 시스템은 가장 빨리 발전하고 있는 신재생 에너지원중 하나로 각광을 받고 있으며, 풍력발전 시스템의 주된 관심사는 어떻게 광범위한 풍속의 변화에서도 효율적으로 시스템을 동작시키는 가에 있다. 일반적으로 풍속은 풍력발전시스템의 동특성에 큰 영향을 미치는 요소이다. 따라서 많은 풍력발전 제어 알고리즘은 성능향상을 위해 풍속의 측정을 요구하게 된다. 그러나 불행히도 풍속계와 같은 센서에 의한 실효 풍속의 정확한 측정은 어려운 실정이며 따라서 제어 시스템의 동작을 위해 풍속은 여러 가지 기법을 통해 추정되고 있는 실정이다. 이에 본 연구에서는 신경망 학습을 통해 현재 풍속을 추정한 후 추정된 풍속을 이용하여 최대 전력점을 추종하는 방법을 제안하고자 하며, 제안된 기법의 유용성 검증을 위해 실제 제작된 실험환경에서의 적용실험을 수행하였다.

풍력발전기를 위한 신경망 기반의 풍속 추정 및 MPPT 기법에 관한 연구

문대선(Dae-Sun Moon),김성호(Sung-Ho Kim) 한국지능시스템학회 2010 한국지능시스템학회논문지 Vol.20 No.6

최근 풍력발전 시스템은 가장 빨리 발전하고 있는 신재생 에너지원중 하나로 각광을 받고 있으며, 풍력발전 시스템의 주된 관심사는 어떻게 광범위한 풍속의 변화에서도 효율적으로 시스템을 동작시키는 가에 있다. 일반적으로 풍속은 풍력발전시스템의 동특성에 큰 영향을 미치는 요소이다. 따라서 많은 풍력발전 제어 알고리즘은 성능향상을 위해 풍속의 측정을 요구하게 된다. 그러나 불행히도 풍속계와 같은 센서에 의한 실효 풍속의 정확한 측정은 어려운 실정이며 따라서 제어 시스템의 동작을 위해 풍속은 여러 가지 기법을 통해 추정되고 있는 실정이다. 이에 본 연구에서는 신경망 학습을 통해 현재 풍속을 추정한 후 추정된 풍속을 이용하여 최대 전력점을 추종(MPPT)하는 방법을 제안하고자 하며, 제안된 기법의 유용성 검증을 위해 실제 제작된 실험환경에서의 적용실험을 수행하였다. As the wind has become one of the fastest growing renewable energy sources, the key issue of wind energy conversion systems is on how to efficiently operate the wind turbines in a wide range of wind speeds. In general, the wind speed is the main factor that impact on the dynamics of wind turbine system. Wind turbine algorithms are thus required to improve the performance of wind speed measurements. However, the accurate measurement of the effective wind speed using wind gauge and similar sensors is difficult such that control systems are needed for wind speed estimation using various techniques. Therefore, this research suggests the Maximum Power Point Tracking (MPPT) method for tracking the wind speed based on neural networks. Design experiments were carried out in laboratory environment to validate the application of the proposed method.

태권도 초임사범의 일상을 통해 본 현재의 애로점과 미래 고민 탐색

문대선(Moon, Dae-Soun),이철원(Lee, Chul-Won),전성범(Chun, Sung-Bum) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.4

This study was designed to explore daily life of newly appointed Taekwondo instructors who’s work experience were under 3 years, in order to take close look and understand the Taekwondo industry and the industry’s practician. The selected research participants were 8 Taekwondo instructors from K city of Gyeonggi Province. As a qualitative research, non-probability sampling of purposeful sampling was used to select the participants. The data was collected from December 2014 to March 2015, consisting of in-depth interview, participant observation, related literature investigation. Furthermore, with the 20 years of Taekwondo industry involvement, first author’s analytic opinion and thoughts in form of autoethnographic discussion were used for the data. As a result of the study, first of all, particular characteristics of Taekwondo instructors’ life with somewhat different attendance time and job specification were drawn. Secondly, problems within the training hour such as recreation focused rather than Taekwondo training itself, conflict with trainnee’s parents, and conflict with co-workers. Thirdly, ‘passion payment’ was found in Taekwondo industry as well. Fourth of all, young instructors were not sure of their future career in current industry due to its unstability.

성인 태권도 참여자의 신체적 자기개념, 자아탄력성 및 생활만족의 관계 분석

문대선(Moon, Dae-Soun),이철원(Lee, Chul-Won),한지훈(Han, Jee-Hoon) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3

This study is to define the Relationship among Physical self-concept, self-resilience and life satisfaction of Adult Taekwondo Participants. This study was analyzed with convenient sampling method of 300 current 2016-adult taekwondo participants who live in Seoul and Gyeonnggi-do, and every questionaries were written in self-administration method. The collected data was analyzed by using the program SPSS WIN Ver.21, with frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis, multiple regression and simple regression. As a result of verifying the relationship between the variables is as follows. First, physical appearance, endurance, muscle -the sub factors of Physical self-conceptwere shown to have a statistically significant effect on the self-resilience. Second, Self-esteem -the sub factor of Physical self-concept- was shown to have a statistically significant effect on the life satisfaction. Third, self-resilience of the adults Taekwondo participants was shown to have a statistically significant effect on life satisfaction.

태권도 참여 대학생들의 열정, 자신감과 행복감의 관계

문대선(Moon, Dae-Soun),이철원(Lee, Chul-Won),고대선(Ko, Dae-Sun) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4

The purpose of this study was to verify the relationship among taekwondo passion, confidence and happiness. The 350 survey questionnaires were distributed the subjects who participate in taekwondo in Seoul and Gyeonggi province. Due to the reliability of data, 350 samples were put to actual analysis. By using SPSS Windows ver. 21.0 and AMOS 18.0, data were analyzed through frequency analysis, reliability analysis, correlation analysis, confirmatory factor analysis and path analysis. The results were as followings. First, taekwondo passion had a significant influence on confidence. Second, taekwondo had a significant influence on happiness. Third, confidence had a significant influence on happiness. Fourth, confidence mediated between taekwondo passion and happiness. Thus, this study shows the importance of confidence to accomplish happiness through taekwondo passion.

여성의 태권도 참여경험 분석: 근거이론

문대선 ( Dae Sean Moon ),이철원 ( Chul Won Lee ) 연세대학교 체육연구소 2013 체육연구논문집 Vol.20 No.1

The purpose of this study was to analyze and provides the structure through women’s participating in taekwondo. For the purpose of this study, active six women participants were selected who are attending taekwondo studio were located in G city, Gyounggi-do, three times a week more than six months using requtational sampling method. The sampling was collected for four weeks, starting from June 24th 2013, using in-depth interview with program participant and observation. The grounded theory was applied to the interview data in order to derived key-words. The results after analysis process were as follows. First, after in-depth interview with participants, total of 104 key words were categorized. Through the first categorization procedures, 19 sub-categories was classified, and second categorization tasks can be explained by incorporating for properties of the top 9 categories were derived. Second, the foaming process of a paradigm for the taekwondo participation women was explained by six elements shown in <Figure 1>. Casual condition is an explanation of the reason choosing taekwondo; diet effects, limits of physical condition, and familiarity. The situational contexts are appeal of taekwondo; yearn for target, fun. Central phenomenon is a women participate in taekwondo; cultivating toughness, fitness, a sense of belonging. The external constraints and internal constraints were shown in the mediated conditions stage. The external constraints are family’s view, other people’s view while internal constraints are time limits and hesitation. Interaction strategies are the joy of family participation and pleasure of self-development. As a result, taekwondo enjoyment shows a consensus and the pleasure of exercise, for the direction of taekwondo development of women needs conversion of recognition and programs, experience.

Ti 및 Mo 첨가에 따른 치과 CAD/CAM용 Ni-Cr 및 Co-Cr합금의 표면분석

문대선(Dae-Sun Moon),최한철(Han-Cheol Choe) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.3

In this study, surface analysis of Ni-Cr and Co-Cr alloys with addition of Ti and Mo for dental CAD/CAM use has been researched experimentally. The surface characteristics of the alloys were examined by Vickers hardness test, bonding strength test, surface roughness test, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction spectroscopy. The shrinkage of the sintered Ni-Cr alloy alloy was slightly larger than that of Ni-Cr-Ti alloy, and larger than Co-Cr alloy. Also, the addition of Mo showed a tendency to decrease shrinkage somewhat. From the result of XRD analysis, NiCr, Ni₃Cr and Ni₃Ti were observed in the sintered Ni-13Cr-xTi and Ni-13Cr-xMo alloys. In addition, σ-CrCo, Co₂Mo₃ and TiCo₂ were formed in the sintered Co-Cr-xTi and Co-Cr-xMo alloys. Surface hardness of Ti and Mo added alloy was higher than those of Ni-Cr and Co-Cr alloy. The bond strength between sintered alloy and porcelain was 16.1 kgf/㎟ for Ni-13Cr alloy, 17.8 kgf/㎟ for Ni-13Cr-5Ti alloy, and 8.2 kgf/㎟ for Ni-13Cr-10Ti alloy, respectively.