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최창균(Chang Keun Choi),윤광식(Kwang Sik Yoon),이승복(Seung Bock Lee),정안철(An Chul Jeong),안병진(Byung Jun Ahn),문도호(Do Ho Moon),도승경(Sung Kyoung Doh),곽현진(Hyun Jun Kwak),김용훈(Yong Hoon Kim),이홍순(Hong Soon Lee),유수웅(Soo 대한내과학회 1998 대한내과학회지 Vol.55 No.1
N/A Objective : Pattern with essential hypertension g ally shows the same circadian pattern as the normothensive person with a night-time reduction or DIP in blood pressure in sleep. The definition of Dipper and Non-dipper are assigned according to arbitrary criteria e.g. a night time average blood pressure which is at least 10% less than the average daytime blood pressure. Prospective evidence that the absence of an overnight dip is a strong adverse prognostic. indicator for target organ damage .Thus we investigate circardian rhythm of blood pressure, related target organ damage, its frequency & drug in hypertensive subjects. Method: 24hr ambulatory blood pressure monitoring, history taking, physical examination, fundoscopy, ECG, chest X ray, dipstick urinanlysis, serum creatinine level are performed in essential hypertensive subjects. Exclusion criteria are duration of hypertension over 5 years, DM, renovascular hypertension & heart failure. Results : Total 42 patients performed study.17 subjects classify dipper group,25 subjects classify non-dipper group. Between dipper 8c non-dipper group shows no significantly difference at stroke history, C/T ratio over 0.5 in chest X-ray, left ventrcular hypertrophy in ECG,ST-T change in ECG, proteinuria & serum creatinine level. Non-dipper group shows significantly difference to dipper group in frequency of hypertensive retinopathy and number of combined drug used subjects. Conclusion Number of hypertensive retinopathy is significantly frequency in non-dipper group. Hypertensive retinopathy is atherosclerotic complication, thus we predict other target organ damage, therefore non-dipper type circardian rhythm of blood pressure is adverse prognostic factor for target organ damage of hypertensive subjects.
최창균 ( C . K . Choi ) 한국화학공학회 1976 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.14 No.3
Natural convection in an initially stagnant horizontal layer of fluid heated from below has received considerable attention since it is a simple example of convective motion generated by the instability of a basic state. Traditionally, it is called Be´nard convection. The principal convection mechanisms have been identified: buoyancy forces resulting from thermally induced density gratients and/or interfacial forces due to surface tension variations produced by temperature gradients. The facts and the problems of Be´nard convection in which turbulence gradually emerges from an ordered pattern are discussed here. Additionally, thermal convection with flowing films and convection induced by gas absorption and electric fields are introduced.
최창균(Changkyun Choi),김태환(Taehwan Kim),박정호(Jeongho Park),이주원(Juwon Lee),남상우(Sangwoo Nam),박주영(Jooyoung Park) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
최근 들어 비지도 학습(unsupervised learning)은 다양한 분야에서 연구되고 적용되며 많은 주목을 받고 있다. 그리고 다양한 비지도 학습방법 중 최근 긍정적인 샘플(positive sample)과 부정적인 샘플(negative sample)간의 유사성과 비 유사성을 학습하는 대조 학습(contrastive learning)을 이용한 사전 학습(pre-training) 방법이 많은 관심을 받으며 연구되고 있다. 이러한 사전 학습 방법은 컴퓨터 비전 등의 분야에서 지도 학습시 데이터의 부족이나 새로운 데이터가 주어졌을 때 정확도 감소 등의 문제를 해결하기 위해 연구되고 있다. 본 논문에서는 이전 연구들의 우수한 결과를 통해 주요 방법론으로 대두되고 있는 대조 학습을 이용하여 생성 모델(generative model)을 사전 학습하고 실제 사용자로부터 얻어진 고차원 센서 데이터를 저차원의 잠재 공간(latent space)상에 표현하고 그 결과를 비교함으로써 사전 학습과 생성 모델의 시너지를 탐구하였다.