의학 상식-알코올과 간

이재균,Lee, Jae-Gyun 한국자연공원협회 2006 한국자연공원 Vol.81 No.-

버어 발생을 최소화하기 위한 미세 드릴가공의 절삭 조건

이재균(Jae-Gyun Lee),왕철수(Cheol-Soo Wang) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.1

The micro drilling process is one of the most fundamental and popularly used process in the machining and assembling process because it has high productivity and high precision. However, the problems in micro-hole machining by micro drill, it is difficult to remove chip from drilled hole and supply cutting oil. So, it is necessary to establish optimum drilling condition and develop a new drilling process. The aim of the present study was to investigate the variation of thrust which was concerned with feed rate. Also, the optimum drilling condition which could minimize burr generation was examined in step feed machining process.

모듈러 건축물을 위한 바닥판 시스템의 구조성능 실험

이재균(Lee Jae-Gyun),박지훈(Park Ji-Hun),조봉호(Cho Bong-Ho) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2

Structural performance tests of five candidate slab systems for the unit structure of a modular building construction are conducted. Through two-point static loading tests, the bending moment strengths and secant flexural stiffnesses of the slab systems are obtained and compared. To investigate the serviceability of each slab system, deflection and vibration criteria are examined to an example modular unit structure. In order to consider the effects of the slab system weight, the flexural stiffness of the girder supporting the slab system with satisfactory serviceability is calculated based on a system natural frequency equation and the experimentally obtained flexural stiffness of the slab system. A slab system with cold-formed channels covered and laterally supported by cellulose fiber reinforced cement (CRC) boards shows the best serviceability performance due to its light weight. On the other hand, relatively heavy slab systems in concrete materials show limited serviceability performance despite excellent strength and stiffness.

금속 부식 방지를 위한 Carbon Film 합성

이재균(Jae Gyun Lee) 산업기술교육훈련학회 2016 산업기술연구논문지 (JITR) Vol.21 No.2

Carbon-based materials have been widely investigated for passivation of metallic parts. In this study, laser annealing process was applied to synthesize a carbon film as a passivation layer an a metallic surface. The carbon film was obtained by pre-annealing under hydrogen environment followed by main annealing under methane environment. The pre-annealing process was indispensable to form the carbon film. The carbon film having high crystallinity was achieved by main-annealing with a laser energy of 1800 mJ/cm2. Main-annealing for only 1 minute was sufficient to form the high quality carbon film at the laser energy.

Weighting된 펄스 열을 사용하는 DMTI 시스템의 S/N북 개선 특성

고성선,이재균,윤현배,Go, Seong-Seon,Lee, Jae-Gyun,Yun, Hyeon-Bae 대한전자공학회 1985 전자공학회지 Vol.22 No.2

A method of weighting of a staggered pulse train is presented and an improvement per-formance of the signal-to-noise ratio for each case is compared. As the result of a computer simulation, the signal-to-noise ratio for weighting of a stagger-ed pulse train is a great improvement on the case of an uniform pulse train. The signal-to-noise ratio of optimum weighting is more improved than that of binomial weighting, it is known that the signal-to-noise ratio is improved as the increasing of the number of delay line cancellers, and it is shown that the signal-to-noise ratio is improved by weighting of the MTI output pulses before the integration process.

일정한 펄스 예을 사용한 DMTI 시스템에서 Weighting 방법에 따른 S/N 북 개선 특성에 관한 비교

고성선,이재균,윤현보,Go, Seong-Seon,Lee, Jae-Gyun,Yun, Hyeon-Bo 대한전자공학회 1985 전자공학회지 Vol.22 No.1

디지탈 이동물체지시기 계통(DMTI System)에서 신호대잡음비(SNR)의 저하는 적정처리 전에 디지탈 이동물체지시기의 출력펄스를 weightlng시킴에 의하여 개선될 수 있구 #정상살기의 수가 증가함에 따라 신호대잡음비가 개선됨을 나타내었다. Optimum weighting으로 얻어진 신호대잡음비는 binomial weighting으로 얻어진 것보다 더 커짐을 알았다. 컴퓨터 시뮬레이션 결과를 통하여 각각의 경우에 대한 신호대잡음비의 배선특성을 나타낸다. A degradation of the signal-to-noise ratio (SNR) in a digital moving target indicator system (DMTI System) can be Improved by weighting of the DMTI output pulses before the integration process. and it Is shown that the signal-to-noise ratio Is unproved as the nunlber of delay line cancellers. It is Known that signal-to-noise ratio obtained with optimum weighting is greater than that obtained with binomial weighting. An improvement performance of the signal-to-noise ratio for each case is presented through the results or a computter simulation.

SDR S/W 플랫폼을 활용한 S/W 설계 및 구현

박우람 ( Uram Park ),이재균 ( Jae-gyun Lee ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2

본 논문에서는 SDR SW 플랫폼을 기반으로 활용 분야에 적용될 수 있는 4종 S/W를 제안한다. SDR SW 플랫폼은 OpenAPI로 제공되어 확장성과 활용성 및 유연성 측면에 장점이 있다. 웹 서비스를 기반으로 구현한 4종 SW는 교육용,경계용,감시용,교통용으로 각 …광의 목적성에 따라 사용하는 파형과 밴드를 설정하여 운용하도록 구성하였고, 운용시에 발생한 데이터를 그래프, 도표 등의 시각적으로 사용자에게 정보를 제공한다. 교육용 S/W는 다중대역,다중파형 설정 및 다양한 정보 제공,경계용 S/W는 실외 특정 구역 감시,감시용 S/W는 실내 침입자 탐지,교통용 S/W는 실시간 차량 현황과 과속 탐지 등 각 S/W에 따라 특정 활용 목적에 기능을 구성하여 구현하였다.

V6 디젤 엔진 벤틸레이션 시스템 개발

박병옥(Byung-ok Park),이세영(Se-young Lee),박윤택(Yun-taek Park),이재균(Jae-gyun Lee),남호성(Ho-seong Nam),홍사훈(Sa-hoon Hong) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

엔진 개발시 블로바이 가스 내에 함유되어 엔진 외부로 빠져나가는 블로아웃 오일의 양을 최소화하기 위해, 다양한 구조나 복잡하고 값비싼 기구들을 채택하여 적용하고 있다. 특히 배기가스 규제가 강화됨에 따라, 배기가스에 악영향을 미치는 블로아웃 오일 양을 감소해야 하는 필요성은 더욱 증가하고 있다. 본 논문은 독창적이면서도 단순한 구조를 통해 블로바이 가스 내에 함유된 엔진오일의 분리 성능을 높여서 블로아웃 오일 양을 절감하고, 엔진 외부에 형성된 블로바이 가스용 파이프 및 호스류를 대폭 삭제함으로써 엔진 원가 절감 및 외관 향상과 함께 차량 탑재성 개선 등을 동시에 달성한 내용에 관한 것이다.

낭창성신염 신조직 검색상 관찰된 아포프토시스 소견

윤성철(Sung Chul Yun),조종태(Jong Tae Cho),이재균(Jae Gyun Lee),김용진(Yong Jin Kim) 대한내과학회 1998 대한내과학회지 Vol.55 No.3

N/A Background: A few researches on apoptosis in proliferative glomerulonephritis including lupus nephritis, have been reported on the basis of animal experimental models and human renal biopsy tissues. Systemic lupus erythematosus has been reported as o disease with an apoptosis defect of lymphocyte, so that it leads to the decreased immunologic tolerance and activated autoimmunity. The lupus nephritis is frequently accompanied with a interstitial fibrosis and tubuloepithelial change, as compared to other nephitis. In addition to that, the pathologic evolution from one class to other class is also feasible and these things make us to think that the lupus nephritis is tightly linked to the apoptosis. Method: We evaluated the relationship between the apoptosis and pathologic characteristics, which was focused on class IV, in 22 patients with clinically and biopsy proven lupus nephritis by comparing with control specimens. The study on the apoptosis was observed through in situ DNA nick end-labeling method and the review on the medical history. Results: 1) An apoptosis in glomerulus was observed in only five patients (zero in Class II, 50% in Class IV) of proliferative glomerulonephritis. But 14 patients (50% in Class II, 75% in Class IV) were detected on the site of tubulo-interstitium. 2) The apoptosis detected in tubulo-interstitial area was significantly correlated with nephrotie syndrome (P<0.025), but correlations with the complement serum level, renal function and the used amount of steroid was not determined. Conclusion: The apoptosis of glomerulus in the lupus nephritis was observed in 50% of proliferative cases (especially, in class IV), but in the area of tubulointerstitium, the higher rate (more than 50%) of apoptotic expressions were observed in class II and class IV. The observation on apaptosis in renal tissue could be another prognostic factor.

내수위 조건에 따른 도시내수침수 예보에 관한 연구

추태호(Tai-ho Choo),추연문(Yean-moon Choo),전해성(Hae-seong Jeon),권창헌(Chang-heon Gwon),이재균(Jae-gyun Lee) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.4

전 세계적으로 발생하고 있는 이상기후현상으로 자연재해의 발생빈도와 피해규모가 증가하고 있는 추세이다. 이로 인하여 도시유역의 수문학적 양상이 변화함에 따라 불투수 면적 증가와 함께 증가된 호우로 심각한 내수침수 피해를 가져온다. 이에 인명 및 재산피해를 최소화하기 위하여 내수침수 예측체계가 필요하다. 본 연구에서는 강우강도와 지속시간만으로 침수예측이 가능한 Flood Nomogram을 개발하였다. 내수침수 발생가능이 매우 높고 침수 위험도가 높은 대도시내 침수예상지역의 내수침수피해 특성을 분석하여 내수침수 예보 기준을 설정하는 방법을 제시하였다. 또한 우수맨홀과 우수관경을 기준으로 내수위를 4가지 조건하에 도시내수침수 예보 기준을 다음과 같이 설정하였다. 1) 우수맨홀이 넘칠 때, 2) 우수관경이 가득 찼을 때, 3) 우수관경의 70%에 도달했을 때, 그리고 4) 우수관경의 60%에 도달했을 경우이다. 따라서, 침수가 발생하기 시작하는 강우와 침수피해를 유발하는 강우사상을 통하여, 내수침수가 시작되기 전에 사전대비, 대응할 수 있는 기준과 예측하는 수단으로 활용할 수 있을 것으로 나타났다. The frequency of natural disasters and the scale of damage are increasing due to the abnormal weather phenomenon occurring all over the world. As a result, as the hydrological aspect of the urban watershed changes, the increase in impervious area leads to serious domestic flood damage due to increased rainfall. In order to minimize the damage of life and property, domestic flooding prediction system is needed. In this study, we developed a flood nomogram capable of predicting flooding only by rainfall intensity and duration. This study suggests a method to set the internal water immersion alarm criterion by analyzing the characteristics of the flooding damage in the flooded area in the metropolitan area where flooding is highly possible and the risk of flooding is high. In addition, based on the manhole and the pipe, the water level was set as follows under the four conditions. 1) When manhole overflows, 2) when manhole is full, 3) when 70% of the pipe is reached, and 4) when 60% of the pipe is reached. Therefore, it can be used as a criterion and a predictive measure to cope with the pre-preparation before the flooding starts, through the rainfall that causes the flooding and the flooding damage.