거대아에 대한 임상적 관찰

이남훈(NH Lee),이춘노(CN Lee),강정대(JD Kang),안관순(GS Ahn) 대한산부인과학회 1976 Obstetrics & Gynecology Science Vol.19 No.2

1. The incidence of large fetuses weighing 4 kg or more was 5.81% of the total deliveries and the babies weighing 4.5Kg or more was 0.79% of the total 2. Over half of large fetuses (50.87%) were born at 40 or 41 weeks of gestation and 40.53% were over 42 weeks of gestation. 3. The large fetus was more frequency seen in multipara and as the parity increases, the incidence of large fetus was gradually elevated, especially in pare 3 or 4. 4. The majority of large fetuses were found to be born either in mothers aged 30-34 (8.04%) or in 35-39 (8.68%) 5. Most cases of large fetuses were male (61.32%) in their sex and the female fetuses were found in 38.68%(male : female = 3:2) 6. Incidence of anemia in mothers with large fetuses was 7.32% and the anemia was more common in multipare (7.94%) than in primipara (5.48%) 7. Medical complications were noted in 17 cases (5.92%) among 287 mothers with large fetuses the most common complications were diabetes (12cases or 4.17%). Of which overt diabetes was found in 2 cases (1.10%) and prediabetes in 10 cases (5.5%) 8. Obstetrical complications were found in 106 cases (37.21%). The uterine dysfunction (12.89%) and the toxemias (6.97%) were most frequent complications. 9. The babies were born vaginarloute in 75.61% and abdominal route in 24.39%. 10. The rate of cesarean section was 3 times high compaaring with overall and major indication for cesarean section was cephalopelivic disproportion (62.8%) repeat cesarean section (17.14%) and fetal distress (12.86%) 11. The shoulder dystocia occured in 5 cases (1.74%) 12. There were 4 cases of perinatal loss, of which three cases were stillbirth and one cases was neonatal death.

벨트 이송 시스템의 결함 진단을 위한 시뮬레이션

이남훈(Lee, Nam-Hoon),유상헌(Lyu, Sang-Heon),인용석(Ihn, Yong-Seok),최연선(Choi, Yeon-Sun),구자춘(Koo, J.C.) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.4

As functional requirements of automatic office machines like printers, Automatic Tellex Machines(ATMs), copying machines are on a trend for the higher speed and precision, extensive technical advances are being developed and implemented in the industry. Media transport system is a device to convey a sheet of paper in ATMs and printers. The stability of media transport system is a matter of concern as their operating throughput rapidly increases. And defects of belts or rollers in a transport system directly affect the level of stability of the system. Therefore an automatic diagnostic system for predicting various defects is necessary for the stable operation of the media transport system. A simulation based on multi-body dynamics has been done for a feasibility study of a system design for the defect anticipation.

음식점과 집단급식소의 자외선 살균소독기 사용실태

이남훈 ( Nam Hoon Lee ),김남일 ( Nam Il Kim ),목철균 ( Chul Kyoon Mok ) 한국산업식품공학회 2007 산업 식품공학 Vol.11 No.3

다중스크린을 이용한 전통극 활성화 연구 -「달빛아래 태양을 품다」 제작사례를 중심으로-

이남훈 ( Nam Hun Lee ),김태형 ( Tae Hyung Kim ) 커뮤니케이션디자인학회 2012 커뮤니케이션 디자인학연구 Vol.38 No.-

전통극 활성화를 위한 다양한 시도들이 이루어지고 있는 상황에서 본고에서는 다중스크린을 이용해서 영상미디어 퍼포먼스의 형태로 접근하려고 한다. 이에 「달빛아래 태양을 품다」의 사례를 통해 다양한 접근시도들을 논의하고 이에 다중스크린을 활용한 사례를 정리하고자 한다. 이를 증명하기 위해 요셉 스보보다의 이론을 들어 다중스크린의 영상적 효과를 증명하고자 한다. 결국 전통극의 활성화를 위한 다양한 접근 중 영상적 접근을 강조하고 이에 단순한 영상활용이 아닌 다중스크린의 활용적인 부분을 통한 접근법을 대안으로 내세운다. 미디어 포퍼먼스 의 공간이 결국 무대화가 되어 기존의 전통극의 양식을 탈피하고 관객의 참여가 자연스럽게 유도되어 기존의 극장적 프레임이 파괴되고 관객이 주체가 되는 새로운 형태가 된다고 볼 수 있다. Traditional performance for the activation of various attempts made in this paper in situations where using a multi-screen performance in the form of visual media is trying to access, This <under the moonlight cherish the sun> with examples of attempts to discuss various approaches utilizing such cases a multi-screen, would like to clean up. To prove their theory of Joseph, Waynesboro, for a more multi-screen is to prove the effectiveness of the youngsangjeok. Eventually jeontonggeuk youngsangjeok of various approaches for the activation of this simple approach emphasizes the use of imaging applications, not part of a multi-screen as an alternative approach naeseunda through. Media performance as the end stage of the space is a painter, and breaking away from traditional forms of jeontonggeuk the participation of the audience is induced naturally existing geukjangjeok frame is destroyed, the principal audience can see that the new form.

어류의 동작속도에 따른 키프레임 추출법

류남훈(NamHoon Ryu),반경진(KyeongJin Ban),김경옥(KyeongOg Kim),오경숙(KyeongSug Oh),이혜미(HyeMi Lee),이상진(SangJin Lee),김응곤(EungKon Kim) 한국통신학회 2009 한국통신학회 학술대회논문집 Vol.2009 No.6

컴퓨터 그래픽스 기술을 접목한 디지털 영상 콘텐츠 산업이 점차 증가하면서, 해저환경을 비롯한 다양한 분야의 콘텐츠가 개발되고 있다. 해저환경을 표현함에 있어서 가장 핵심인 어류의 자연스러운 움직임을 표현하는 방법으로 핵심이 되는 몇 개의 프레임을 제작 후 이 프레임들의 값들을 참고하여 중간 프레임을 산출하는 방법이다. 본 논문에서는 이 방법에 진자개념을 적용하여 사인곡선을 그리며 움직이는 꼬리의 움직임을 표현함으로써 자연스러운 어류의 움직임을 표현하고자 한다.

동적격자변형기법을 이용한 2차원 실린더의 와류유발진동에 대한 수치해석

이남훈(Namhun Lee),백지영(Jiyoung Baek),이승수(Seungsoo Lee) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.1

이 논문에서는 2 차원 실린더의 와류유발진동에 따른 Lock-in 현상에 대해 수치해석을 수행하였다. 실린더의 운동을 모사하기 위해 변형격자와 고정격자를 이용하였다. 스프링상사기법을 이용하여 격자를 변형하였다. 격자수 및 시간 간격 등을 조절해 얻은 수렴된 수치해가 비교 및 검증에 사용되었다. 또한, 유체-구조 결합 방법들의 효율성과 정확도를 비교 검토하였다. In this paper, numerical simulations are performed on the lock-in phenomena of vortex induced vibration(VIV) of a two dimensional cylinder. A deforming grid as well as a rigidly moving grid are used to simulate the movement of the cylinder. The grid deformation is accomplished by the linear spring analogy. Converged solutions, which are obtained by controling the grid size and the non-dimensional time step, are used for comparison and validation of the analysis results. Moreover, the efficiency and the accuracy of the coupling methods for fluid-structure interaction are examined.

GPU를 이용한 고속 스페클 제거 알고리즘에 관한 연구

이건(Geon Lee),이명준(Myung-Jun Lee),정남훈(Nam-Hoon Jeong),최재호(Jae-Ho Choi),김경태(Kyung-Tae Kim) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.9

합성 개구면 레이다(synthetic aperture radar: SAR) 영상 생성 시, 영상의 한 해상도 셀 내에 다수의 산란자가 존재할 경우, 산란자들로부터 반사되어 돌아오는 신호가 상호간에 간섭을 일으켜 영상 내의 화소의 강도를 불규칙적으로 변화시키며, 이러한 불규칙적인 강도를 지닌 화소들을 스페클이라고 한다. 스페클은 화소 탐지 시 오탐지율을 증가시키고, 탐지율을 떨어트리며, 이러한 문제를 해결하기 위해 스페클 제거 필터들이 개발되었다. 그러나 스페클 제거 성능이 우수한 필터들은 처리 시간이 길어 실시간 처리와 같은 고속 처리가 중요한 상황에서 사용할 수 없었다. 본 논문에서는 스페클 제거 필터의 처리 속도를 증가시키기 위하여 그래픽 처리 장치(graphics processing unit: GPU)를 사용하였으며, 기존의 스페클 제거 필터의 알고리즘을 GPU의 병렬화 연산에 맞춰 최적화시키고, SAR 영상에 대하여 최적화한 알고리즘과 기존의 알고리즘을 수행하여 수행시간 및 필요로 하는 데이터 공간을 분석하였다. When a synthetic aperture radar (SAR) image is created, if there are some scatterers in the resolution cell, the reflected signals from the scatterers interfere with each other, causing irregular changes in the intensity of pixels in the image called speckles. Speckles increase the false alarm rate and decrease the pixel detection rate. Therefore, speckle reduction filters have been developed to reduce the influence of speckles. However, filters that reduce large amounts of speckles have a long processing time; therefore, they are costly to use in real-time applications, in which quick processing is crucial. This study used a graphics processing unit (GPU) to increase the processing speed of speckle reduction filters and optimized the existing speckle reduction algorithm to run in parallel with a GPU. Furthermore, we compared the processing time and data capacity of existing and optimized algorithms.

CVT 경차의 럼블 노이즈 개선에 관한 연구

이남훈(Namhoon Lee),윤재원(Jaewon Youn),이정근(Jungkeun Rhee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

GM Korea has developed new CVT mini vehicle reflecting customers concerns about low fuel economy at high speed and lack of power in the current AT vehicle. Currently adopting CVT system is increasing due to following reasons. 1) CVT can provide better fuel economy than AT by enabling the engine to run at its most efficient rpm for a range of vehicle speeds and continuous gear ratio change. 2) It can be used to maximize the performance of a vehicle by allowing the engine to turn at the rpm at which it produces maximum torque and power. 3) It is more comfortable than AT by minimizing shift shock with continuous gear ratio change. But additional N&V issues, result in weight increase compare with AT, should be treated and optimized well. During the CVT vehicle development, rumble noise in vehicle interior was issued. Generally main source of rumble noise is crankshaft and powertrain bending but main contributor is structure-born noise transferred by engine and transmission mounting system. Rumble noise is problematic if mounting system design is not optimized for the powertrain vibration mode or it can’t minimize or amplify the powertrain rumble vibration. This paper shows root-cause of rumble noise and its improvement process which appeared in the CVT vehicle development process. Applying Red-X method, WOW BOB vehicles were chosen to compare the noise level difference and to estimate contribution and improvement potential of each component and N&V test have been carried out for these selected items.

EU5 2.0/2.2L 디젤엔진의 NVH 개발

이남훈(Namhoon Lee),백승목(Seungmok Baek),박원식(Wonsik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

GMDAT has developed new EU5 2.0 and 2.2 liter L4-cylinder turbocharged diesel engines that have improved power, lower exhaust gas emissions and better NVH performance compared to the previous EU4 engine. Nowadays customers want not only performance and fuel economy but also better NVH performance. To satisfy these consumer expectations, GMDAT set the NVH target as best in segment and to meet this target, engine hardware as well as combustion noise have been improved at each stage of engine development process. This paper will describe the NVH development process of the engine, including target setting process from benchmarking, NVH improvements of engine components and solutions for quality issues during development process.

시리즈 C : 수학학습부진아 지도를 위한 도움자료의 개발과 효과 분석

이남훈 ( Nam Hoon Lee ),권성룡 ( Sung Yong Kwon ) 한국수학교육학회 2005 初等 數學敎育 Vol.9 No.2