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지역난방 열사용시설의 열교환기 성능에 대한 실험적 연구
김주완(Kim Joo-Wan),백영진(Baik Young-Jin),이영수(Lee Young-Soo),조성환(Cho Sung-Hwan),정대헌(Chung Dae-Hun) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
District Heating System(DH) is one of the most excellent system in terms of energy saving and environmental protection. In order to comply with the global energy crisis and environment problem , it is necessary to research and develop the energy utilization technology with the reduction of the primary energy usage. Although the incresing rate of energy consumption started to attenuate , the entire growth in Korea. The energy demand in Korea increses by annual 3.7% during the period from 2000 to 2006. And it is expected that we should take a charge of the greenhouse gas reduction obligation by the Climatic Charge Convention(Kyoto Protocol) during the 2nd pledge period(2013~2017). This thesis reports something about comparisons between Braze & Gasket heat exchanger.
항행 및 항법 : 레이저 센서에서 두 개의 특징점을 이용한 이동로봇의 항법
김주완 ( Joo Wan Kim ),심덕선 ( Duk Sun Shim ) 한국항행학회 2014 韓國航行學會論文誌 Vol.18 No.2
이동로봇의 주행에는 주로 바퀴 엔코더, 비전, 초음파, 레이저 센서가 많이 사용된다. 바퀴의 엔코더는 추측항법으로 시간에 따라 오차가 누적되기 때문에 단독 사용으로는 정확한 로봇의 위치를 계산할 수가 없다. 비전 센서는 풍부한 정보를 제공하지만 정보추출에 시간이 많이 소요되고, 초음파 센서는 거리정보의 정확도가 떨어지기 때문에 항행에 사용하기에는 어려움이 있다. 반면 레이저 센서는 비교적 정확한 거리정보를 제공하여 주므로 주행 센서로 사용하기 적합하다. 본 논문에서는 레이저 거리계에서 각도를 추출하는 방법을 제안하고 칼만 필터를 사용하여 레이저 거리계에서 추출한 거리 및 각도와 바퀴 엔코더에서 추출한 거리 및 각도에 대한 정합을 수행한다. 일반적으로 레이저 거리계 사용시 특징점 하나를 사용한 경우에 그 특징점이 변하거나 새로운 특징점으로 이동할 때 오차가 커질 수가 있다. 이를 보완하기 위해 이동 로봇의 주행 시 레이저 스캐너에서 두 개의 특징점들을 사용하는 방법을 사용하여 이동 로봇의 항법 성능이 향상됨을 보인다. Mobile robots use various sensors for navigation such as wheel encoder, vision sensor, sonar, and laser sensors. Dead reckoning is used with wheel encoder, resulting in the accumulation of positioning errors. For that reason wheel encoder can not be used alone. Too much information of vision sensors leads to an increase in the number of features and complexity of perception scheme. Also Sonar sensor is not suitable for positioning because of its poor accuracy. On the other hand, laser sensor provides accurate distance information relatively. In this paper we propose to extract the angular information from the distance information of laser range finder and use the Kalman filter that match the heading and distance of the laser range finder and those of wheel encoder. For laser scanner with one feature point error may increase much when the feature point is variant or jumping to a new feature point. To solve the problem, we propose to use two feature points and show that the positioning error can be reduced much.
골프 드라이버샷 동작에서 공 속도에 따른 운동학적 변인 비교
김주완(Kim, Joo-Wan),천영진(Chun, Young-Jin) 한국사회체육학회 2016 한국사회체육학회지 Vol.0 No.64
The purpose of this study was to compare three-dimensional imaegs through the analysis of the kinematic variables of the ball speed when the driver shot in competitio nof high school athletes, the analysis for this purpose. For this study, were enrolled in the eight high school athletes who participated in The 13th of Konkuk University President championship. Using a total of two camera sand one Flightscope recorded in Gunsan CC 6 hole Lake Course. Data Base through the recording had Coordinate using KWON3D 3.01. The result of this study can be summarized as follows. Had swing time in accordance with phase has appeared as a lowgroup in a ADD-TOP intervals shorter than the highgroup, in the case of BST-IMP phase showed that the lowgroup shorter than the parent group, the total swing time of this lowgroup than the highgroup It is shown to be short. Compared to a lowgroup of a highgroup head movements are seen as more significant difference between left and right when the back-swing Top statistically about the movement of the hand occurred(p<.05). This appeared to be highgroup caulking angle is lower than the lowgroup, the shoulder angle at impact was found to be greater than the lowgroup is highgroup, the difference in the angle at address and at impact angles showed that the higher greater group. Sacral angle was take the form which bowed all the backswing top, impact, in the case of highgroup showed a form similar to the upright swing impact. X-factor value of this lowgroup was higher than highgroup, the X-factor impact when the value of this lowgroup was higher than the highgroup. Angular velocity body is a lowgroup showed faster than the highgroup, the pelvis showed a higher angular velocity is faster than the lowgroup.
지역난방시스템에 의한 공동주택의 외기보상제어 적용에 관한 실험적 연구
김주완(Joo-Wan Kim),유재성(Jae-Sung Ryu),조성환(Sung-Hwan Cho),이영수(Young-Soo Lee),정상훈 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The objectives of this study are to find the optimal control method for apartment house with district heating system experimentally. An experimental facility consisting of small sized district heating system including heat exchangers and floor heating room have been built. The facility enables to compare the results of various control methods. This study have experimented about typical supply water temperature control method, outdoor reset control method and predictive optimal control method. Results show that outdoor reset control method was able to save heating energy until 7% more than typical supply water temperature control method. And the predictive optimal control method have showed most effective method control.