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김창남,변용수,김정만,김의간,Kim Chang-Nam,Byun Young-Su,Kim Jeong-Man,Kim Ue-Kan 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
In order to compute the radiated sound from a vibrating structure, the Rayleigh's integral equation has to be derived from the Helmholtz equation using Green's function. Generally, the surface velocity in the Rayleigh's integral equation uses the root mean square(rms) velocity. The calculation value is too large, because it's not considered cancelation. On the other hand. using the complex velocity, the sound pressure is calculated too small, because it considers that sound is perfectly canceled out. Therefore, this thesis proposes a correction factor(CF) which considers vibration modes and the method by which to calculate the radiating sound pressure. The theoretical results are compared with the experimental values, and the proposed method can be verified with confluence.
김창남,Kim, Chang-Nam 대한출판문화협회 1997 출판저널 Vol.205 No.-
다양한 영역으로 관심 폭을 넓힌 문화담론은 최근 종합적인 문화론과 전문.세분화된 접근의 두가지 양상을 띤다. 올해도 이런 경향은 지속될 것이며 미래문화적 변화에 대한 욕구로 정보통신혁명의 문화적 영향에 대한 다양한 관심이 표출될 것이다.
Aortic Composite Valve Graft의 이식시 인조혈관을 이용한 좌 관상동맥의 문합술 1례 보고
김창남,최종범,최형호,Kim, Chang-Nam,Choe, Jong-Beom,Choe, Hyeong-Ho 대한흉부심장혈관외과학회 1996 Journal of Chest Surgery (J Chest Surg) Vol.29 No.6
Aortic composite valve graft를 이식하는 술식에서 관상동맥을 문항하는 방법에 따라 그 단점과 합병증을 가지고 있다. 종래에 주로 이용되었던 방법과 달리, composite graf 문합부의 긴장을 줄여 출혈을 최소화하고 만기에 발생할 수 있는 가성 대동맥류를 방지할 수 있는 술식을 서술하고자 한다. 저자들은 심한 대동맥판 폐쇄부전이 합병된 급성 대동맥 박리 (DeBakey Type I)를 가진 40세 남자에서 composite graft의 이식과본변형술식을시행했다 본술식에서 좌관상동맥구에 직경 10mm의 인조혈관을문합하고 그 원위부를 composite gray떼 문합하였으며 우 관상동맥 단추편은 composite graf떼 직접 문합하였다. 이 방법으로 판륜 가까이에 위치한 좌관상동맥구를 과도한 긴장없이 composite gray에 쉽게 부착할 수 있어서 술후 출혈 및 가성동맥류의 발생을 최소화할 수 있을것으로 사료된다. The usual methods for the re-attachment of coronary ostia to the ascending aortic conduit have several disadvantages and potential complications. A novel, straight forward technique is described that allows for tension free anastomoses to be co structed with minimal risk of blood loss and a reduced risk of reoperation for false aneurysms at the anastomoses. We performed this technique for the treatment of a 40-yrs-old male patient of acute aortic dissection (Stanford Type A, DeBakey Type I) with severe aortic re- gurgitation. The techinque comprised anastomosis of a beveled interposition tube graft to the left main coronary artery ostium, and its proximal anastomosis to the ascending aortic graft after seating the com- posite valve graft in the prepared aortic annulus. With this technique, the low-Iying or distant left main coronary ostium can be easily reattached to the ascending conduit without undue tension.
복합 건축자재의 물질전달계수를 이용한 실내 오염물질 농도 예측방법
김창남(Kim Chang-Nam),이윤규(Lee Yun Gyu),이승복(Leigh Seung Bok),김태연(Kim Tae Yeon) 한국건축친환경설비학회 2007 한국건축친환경설비학회 논문집 Vol.1 No.2
In order to predict the indoor air pollutant, the VOCs emission rate is used through small chamber in the design process. However, the small chamber method has limitations as the convective mass transfer coefficient, the most important factor when predicting VOCs contamination of indoor air, is different between the small chamber result and the measured data in the actual building. Furthermore, the existing studies which analyzed mass transfer coefficient in the small chamber were directed on the small chambers developed at the time and FLEC(Field and Laboratory Emission Cell), thus, are different from the current small chamber which has been changed with improvements. The purpose of this study is to determine the emission rate of pollutant in double-layered building materials, and predict the indoor pollutant concentration through the CFD(Computational of Fluid Dynamics) and CRIAQ2 based on the mass transfer coefficient on singled-layered building material by using the current small chamber widely used in Korea. Futhermore, this study used the new convective mass transfer coefficient(hm') which indicates the existing convective mass transfer coefficient(hm) including VOC partition coefficient(k). Also, formaldehyde was selected as target pollutant.