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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.
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.
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.
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.
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.
지능형 클러스터링 기법에 기반한 풍력발전 고장 검출 시스템
문대선(Dae-Sun Moon),김선국(Seon-Kook Kim),김성호(Sung-Ho Kim) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.1
Nowadays, the utilization of renewable energy sources like wind energy is considered one of the most effective means of generating massive amounts of electricity. This is evident in the rapid increase of wind farms all over the world which comprise a huge number of wind turbines. However, the drawback of utilizing wind turbines is that it requires maintenance, which could be a costly operation. To keep the wind turbines in pristine condition so as to reduce downtime, the implementation of CMS (Condition Monitoring System) and FDS (Fault Detection System) is mandatory. The efficiency and accuracy of these systems are crucial in deciding when to carry out a maintenance process. In this paper, a fault detection system based on intelligent clustering method is proposed. Using SCADA data, the clustering model was trained and evaluated for its accuracy through rigorous simulations. Results show that the proposed approach is able to accurately detect the deteriorating condition of a wind turbine as it nears a downtime period.
소형 풍력발전시스템을 위한 무선 원격 모니터링 시스템 개발
문대선(Dae-Sun Moon),김성호(Sung-Ho Kim) 한국지능시스템학회 2012 한국지능시스템학회논문지 Vol.22 No.4
최근 전 세계적인 기후변화와 기존 화석연료와 관련된 전 지구적인 관심사는 풍력발전에 대한 많은 관심을 불러 왔다. 특히, 10Kw이하의 소형 풍력발전시스템은 전 세계적으로 많은 국가에서 활발히 설치되고 있는 실정이다. 일반적으로 소형풍력발전 시스템이 상업적인 목적으로 설치되기 위해서는 해당 풍력발전시스템의 성능 인증이 필수적으로 요구된다. 이를 위해서는 효율적인 운영이 가능한 풍력발전 원격 모니터링 시스템의 개발이 요구된다. 이에 본 연구에서는 새로운 형태의 지그비 기반의 무선통신 기법을 이용한 무선 원격 모니터링 시스템을 제안하고자 하며 제안된 기법의 유용성 확인을 위해 실제 실험을 수행하고자 하였다. Recently, concern over climate change and global politics associated with traditional fossil fuel energy sources has driven significant increase in wind energy utilization over the past decade. Especially, small wind turbine systems below 10㎾ are actively developed by several companies from all over the world. Generally, for the small wind turbine systems to be installed for commercial purposes, the performance of the system should be certified. For this, wireless remote monitoring system should be developed for efficient monitoring. In this work, a new type of wireless remote monitoring system based on Zigbee communication is proposed. Furthermore, practical experimentations are carried out to verify the feasibility of the proposed scheme.