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연안 해양기상(해상풍, 수온) 관측을 위한 항공기 원격탐사 시스템
김덕진,조양기,강기묵,김진우,김승희,Kim, Duk-Jin,Cho, Yang-Ki,Kang, Ki-Mook,Kim, Jin-Woo,Kim, Seung-Hee 한국해양학회 2013 바다 Vol.18 No.1
인공위성은 넓은 지역에 대한 전 세계의 정보를 획득하는데 유용하지만, 좁은 지역에 대한 적시적소에 촬영하는 데는 한계가 있다. 이러한 단점을 극복하기 위하여 본 연구에서는 항공기 원격탐사 시스템을 구축하였다. 항공기 원격탐사시스템은 SAR센서와 열적외선 센서로 구성되어 있으며, 획득된 자료의 방사 및 기사보정을 위하여 GPS, IMU, 온도/습도계 등도 설치하였다. SAR영상은 표면 거칠기에 따라 민감하게 반응하여 밝기 값이 달라지게 되며, 해양에서는 바람에 의해 쉽게 생성 되는 표면 장력파의 진폭이 이러한 표면 거칠기를 야기한다. 따라서 정량화된 SAR의 후방산란과 해상풍 사이의 관계식을 통해 해상풍 추출이 가능하다. 한편, 열적외선 센서는 물체의 온도를 측정하는데 유용하며, 물체와 센서 사이의 대기에 의한 효과를 보정한 후 수온 추출이 이루어진다. 이 두 센서를 탑재한 항공기로 서해안 일대를 4차례 시험비행을 수행하였으며, 이로부터 획득된 SAR 및 열적외선 영상의 품질이 연안환경 모니터링 및 해양기상 자료 추출에 충분함을 보여주었다. Although space-borne satellites are useful in obtaining information all around the world, they cannot observe at a suitable time and place. In order to overcome these limitations, an airborne remote sensing system was developed in this study. It is composed of a SAR sensor and a thermal infrared sensor. Additionally GPS, IMU, and thermometer/hygrometer were attached to the plane for radiometric and geometric calibration. The brightness of SAR image varies depending on surface roughness, and capillary waves on the sea surface, which are easily generated by sea winds, induce the surface roughness. Thus, sea surface wind can be estimated using the relationship between quantified SAR backscattering coefficient and the sea surface wind. On the other hand, thermal infrared sensor is sensitive to measure object's temperature. Sea surface temperature is obtained from the thermal infrared sensor after correcting the atmospheric effects which are located between sea surface and the sensor. Using these two remote sensing sensors mounted on airplane, four test flights were carried out along the west coast of Korea. The obtained SAR and thermal infrared images have shown that these images were useful enough to monitor coastal environment and estimate marine meteorology data.
고등학교 태권도선수의 동기, 자아탄력성 및 탈진의 관계
김덕진 ( Duk-jin Kim ) 대한무도학회 2016 대한무도학회지 Vol.18 No.2
본 연구는 고등학교 태권도선수를 대상으로 동기와 탈진의 관계를 조사하고, 동기와 탈진의 관계에서 자아탄력성의 매개효과를 검증하고자 하였다. 연구 대상은 J지역에서 개최된 태권도 대회에 참가한 고등학교 태권도선수 217명(남학생 137명, 여학생 80명, 평균연령 17.7세)이었다. 참여자들은 동기, 자아탄력성 및 탈진 질문지에 자기평가기입법으로 작성하였다. 수집한 자료는 SPSS 18.0과 AMOS 18.0 통계프로그램을 사용하여 기술통계, 확인적 요인분석, 신뢰도분석과 상관관계분석 및 구조방정식모형분석을 실시하였다. 이러한 절차를 통해 얻은 연구결과는 다음과 같다. 첫째, 동기는 자아탄력성에 유의한 정(+)의 직접 영향을 미치는 것으로 나타났다. 둘째, 자아탄력성은 탈진에 유의한 부(-)의 영향을 미치는 것으로 나타났다. 마지막으로 자아탄력성은 동기와 탈진의 관계를 부분적으로 매개하는 것으로 나타났다. 이러한 연구결과는 동기가 높은 수준의 자아탄력성을 통해 엘리트 태권도선수의 탈진을 예방할 수 있다는 것을 제안하며, 교육적 함의와 미래 방향에 대해 논의하였다. The aims of this study were to examine the relationship between motivation and burnout, and whether these relationships are mediated by ego-resilience. Participants were 217(137 males, 80 females; mean age 17.7 years) high school taekwondo athletes who participated taekwondo games in the Jeju province. Participants completed the behavioral regulation exercise questionnaire, ego-resilience questionnaire, and burnout questionnaire. A series of data analysis such as descriptive analysis, confirmatory factor analysis, reliability analysis, correlation analysis, and structural equation model(SEM) analysis were conducted using SPSS 18.0 and AMOS 18.0 program. The conclusions of this study based on the results are as follows: First, motivation had positive effect on ego-resilience. Second, ego-resilience had negative effect on burnout. Finally, ego-resilience partially mediated the relationship between motivation and burnout. These findings suggest that motivation may offer some protection from burnout for taekwondo athletes due to higher levels of ego-resilience, and are discussed in terms of its educational implications and future direction.
여가스포츠 상황에서 자기결정이론에 근거한 운동 목표내용 척도개발과 이론적 모형 검증
김덕진(Duk Jin Kim) 한국여가레크리에이션학회 2015 한국여가레크리에이션학회지 Vol.39 No.1
Grounded in self-determination theory(SDT), this study had two purpose: (a) distinguishes between intrinsic and extrinsic exercise goals, which tend to fall in to two separate constructs; and (b) examine the associations between exercise goal content, basic psychological need and leisure sport motivation. Developed by SDT researchers, the Aspiration Index or Life Goal Content has been widely explored. However, it has not previously been evaluated in Korea. The exercise goal content is designed to assess the constructs of intrinsic goal and extrinsic goal content. In a sample of leisure sport participants, exploratory and confirmatory analyses supported a 20-item solution consisting of 5 factors and revealed that a hypothesized second-order, two-factor model fits well with the observed data. The exercise goal content also showed good reliability and construct validity in the study 1. Additionally, the study 2 tested a model of the assumed sequential relationships among exercise goal content, psychological need and leisure sport motivation. The hypothesized mediational roles of psychological needs satisfaction was also studied. Consequently, intrinsic goal content had significant direct psychological need and autonomous motivation, and indirect effect on autonomous motivation. Whereas, extrinsic goal content had only significant direct on psychological need and controlled motivation.
2층식 호기성 여상 시스템에서의 하수의 질산화 특성에 관한 연구
김덕진 ( Duk Jin Kim ),임도영 ( Do Young Lim ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.6
The aim of this study is to evaluate the performance and nitrification of a two-media BAF system composed of a double-layer bed. The hydraulic load was set at 37.5m3/m2·day. The empty bed contact time (EBCT) of the filter bed was 1.3 hour. The backwash was carried out every 48 hours; combined sour air and water backwash(5min), followed by water backwash (10min). The water and air backwash application rate was set at 0.05m3/min, 0.22m3/min, respectively. As a result, both BOD and SS removal performance was stable with a removal efficiency of 75% or more regardless of the water quality at more than 15℃. The nitrification reaction started rapidly from the upper part of the filter bed by the point of 60cm at 27℃, at the point of 90cm in case of 13℃. The nitrification reaction was affected by not only the water temperature but also the influence of the removal situation of BOD and SS in the upper part of the filter bed. Additionally, it is possible to quantitatively predict the nitrification rate with an empirical equation with the coefficient water temperature and SS load.