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황선호(Sun Ho Hwang) 한국자료분석학회 2023 Journal of the Korean Data Analysis Society Vol.25 No.4
최근 우리나라는 급격한 인구 고령화 현상과 관련하여 높은 노인빈곤율을 보여주고 있으며,이로 인해 고령층의 소득보장에 대한 관심이 높아지고 있다. 본 연구에서는 국민노후생활보장패널조사 자료를 이용해 고령층에서 관찰되는 소득 위험을 추정하고자 하며, 이를 위해 소득의 지속성 관점에서 실증분석을 하려고 한다. 먼저 패널 분위회귀분석 방법론을 이용하여 가계소득의확률적인 부분을 영구적 소득 성분과 일시적 소득 성분으로 분리한다. 영구적 소득 성분은 1차Markov 확률과정을 따르며, 임시적 소득 성분은 시간에 따라 독립적이고 영구적 소득 성분과 독립적이라고 가정한다. 영구적 소득 성분을 이용하여 소득의 지속성을 추정하고, 시뮬레이션을 통해 영구적 소득 충격이 소득에 미치는 동태적 효과를 분석하였다. 분석 결과, 고령층의 가구 소득에 비선형적 지속성이 존재함을 발견하였다. 또한, 영구적 소득 충격의 동태적 효과가 과거의소득 이력에 따라 다르게 나타난다는 것을 알 수 있었다. 이러한 결과는 노동시장에 참여하고있는 연령층을 대상으로 한 연구와 차이를 보인다. 특히, 영구적 소득 충격은 고령층 가구 소득에 더 민감하게 영향을 미치는 것으로 분석되었다. This study estimates income risk observed among the elderly using the Korean Retirement and Income Study data. In order to decompose household income into permanent and transitory components, the quantile-based panel data framework is employed. The permanent component is assumed to follow a first-order Markov process, and the transitory component is assumed to be independent over time and also independent of the persistent components. I estimate the income persistence from the estimated permanent income component, and analyze the dynamic effects of permanent income shocks on income through simulations. The results show the presence of nonlinear persistence in the household income of the elderly. Furthermore, it is observed that the dynamic effects of permanent income shocks vary depending on the past income history. These findings differ from studies focused on the age groups participating in the labor market. In particular, the permanent income shocks have a significant impact on the income of elderly households. In particular, the permanent income shocks have a significant impact on the income of elderly households.
황선호(Sun-ho Hwang),윤재식(Jae-sik Yoon),김병일(Byung-il Kim) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.4
In this study, niobium powder was made from potassium heptafluoroniobite(K₂NbF?) using sodium(Na) as a reductant and KCl, KF as a diluent based on the hunter metallothermic reduction method. The excesses of reductant were varied from 0%, 3%, 5% and 7%. When 7% excess of sodium was used, the un-reacted sodium remained in the reacted product. The niobium powder has been achieved by reducing 50 g of K₂NbF? with 5% sodium excess in a charge at a reduction temperature of 850℃. The proportion of fine fraction decreased appreciably and the yield of niobium powder improved from 65% to 85% with the increase of sodium excess. The average particle size of niobium powder is improved from 0.2 microns to 0.3 microns in the 5% excess sodium.
일차적 관상동맥 중재술로 치료한 진성 다혈구증 환자에서 발생한 급성 심근경색증
황선호 ( Sun Ho Hwang ),윤남식 ( Nam Sik Yoon ),김주한 ( Ju Han Kim ),안영근 ( Young Keun Ahn ),정명호 ( Myung Ho Jeong ),강정채 ( Jung Chaee Kang ) 대한내과학회 2007 대한내과학회지 Vol.72 No.4
Polycythemia vera is a chronic myeloproliferative disease characterized by clonal proliferation that arises at the level of the pluripotent stem cell and is also characterized by multiple episodes of bleeding or thrombotic complications. Rarely, polycythemia vera causes coronary arterial occlusion and can lead to ischemic heart disease. We experienced a case of acute ST elevation myocardial infarction in a 70-year-old man with polycythemia vera, who had been treated with hydoxyurea and phlebotomy since August 2005. He complained of severe chest pain of a one-hour duration and an ECG revealed an acute anterior ST elevation myocardial infarction. His leukocyte count was 18,700/mm3, red blood cell count 6,790,000/mm3, hemoglobin level 16.6 g/dL and platelet count 520,000/mm3. A diagnostic coronary angiography showed critical stenosis in the middle left anterior descending artery (LAD) and thrombotic total occlusion in the first diagonal branch (D1). Successful primary percutanenous coronary intervention was performed using a drug eluting stent in the LAD and balloon angioplasty for the D1 lesion. (Korean J Med 72:426-432, 2007)
지하역사 공기조화기 장착용 판넬형 부직포필터 성능 연구
황선호(Sun-Ho Hwang),배성준(Sung-Joon Bae),신창헌(Chang-Hun Shin),박윤호(Youn-Ho Park),권순박(Soon-Bark Kwon),김세영(Se-Young Kim) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
As the life quality is higher and higher, the requirement for the clean air in a subway station is strongly being increased. Therefore, many researches have been performed about that. Seoulmetro has taken many parts and has applied latest products for the higher level of air quality. However, by various kinds of facilities, it is hard to maintain the facilities and verify their performances. Therefore it is better to use qualified air filter system by the performance test at subway stations than to apply newly developed one without any verification. This study is focused on the performance verification for a panel structure, which consists of non-woven fabric, to suggest the standard of air filter systems.
재진입기구를 사용한 풍선재진입술을 통해 내막하-내막하공간으로 얕은넙다리동맥 폐쇄를 성공적으로 재개통한 1예 난외표제 : 말초혈관질환에서의 풍선재진입술
송호영 ( Ho Yeong Song ),정일형 ( Il Hyung Jung ),강충 ( Chung Kang ),남동인 ( Dong In Nam ),안홍주 ( Hong Ju An ),이상선 ( Sang Sun Lee ),강훈 ( Hun Kang ),조상철 ( Sang Cheol ),황선호 ( Sun Ho Hwang ),김완 ( Wan Kim ),강원유 ( W 전북대학교 의과학연구소 2014 全北醫大論文集 Vol.38 No.1
혈관내재개통술은 말초혈관질환의 만성완 전폐쇄의 치료로 널리 사용되고 있다. 재진입기구의 성장은 이런 중재술을 더욱 용이하게 만들었다. 하지만 복잡한 혈관상태는 재진입술을 어렵게 한다. 이에 저자들은 왼쪽 얕은넙다리동맥의 만성완전폐쇄를 가진 85세 남환에서 내막하공간에서 다른 내막하공간으로 재진입기구를 삽입하여 풍선재진 입술을 성공적으로 시행한 증례를 경험하였기에 보고하는 바이다. Endovascular revascularization is widely used in the treatment of chronic total occlusion of the peripheral artery disease. The development of re-entry devices has made this intervention easier. However, complicated vascular conditions make re-entry challenging. Here, we report a case of an 85-year-old man with complicated chronic total occlusion of the left superficial femoral artery successfully treated by using a re-entry device from a subintimal space to another subintimal space by balloon re-entry technique.
금속열환원 공정에서 반응온도가 니오븀 분말 특성에 미치는 영향
윤재식,이영미,황선호,김병일,Yoon, Jae-Sik,Lee, Young-Mi,Hwang, Sun-Ho,Kim, Byung-Il 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.2
Niobium powder was made from potassium heptafluoroniobite ($K_2NbF_7$) as the raw material using sodium (Na) as a reducing agent based on the hunter process. The apparatus for the experiment was designed and built specifically for the present study. The niobium particle size greatly increased as the reduction temperature increased from $710^{\circ}C$ to $800^{\circ}C$. The particle size was fairly uniform, varying from $0.09{\mu}m$ to $0.4{\mu}m$ depending on the reduction temperatures. The niobium powder morphology and particle size are very sensitive to a reaction temperature in the metallothermic reduction process. The yield of niobium powder increased from 55% to 80% with a increasing a reaction temperature.
생활폐기물(生活廢棄物) 소각(燒却) 비산(飛散)재의 소성(燒成) 조건(條件)에 따른 Calcium Chloroaluminate 합성(合成) 거동(擧動)에 관한 연구(硏究)
유광석,이성호,황선호,안지환,Yoo, Kwang-Suk,Lee, Seong-Ho,Hwang, Sun-Ho,Ahn, Ji-Whan 한국자원리싸이클링학회 2010 資源 리싸이클링 Vol.19 No.5
The aim of this study is to investigate the behaviors of synthesis of Calcium Chloroaluminte($11CaO{\cdot}7Al_2O_3{\cdot}CaCl_2$) under the melting temperature of municipal solid waste incineration fly ash(MSWI fly ash); $900^{\circ}C-1300^{\circ}C$ of sintering temperature. A sludge generated from a water purification plant (SW) was also used to fill up $Al_2O_3$ source, which might be deficient in MSWI fly ash. MF and SW were mixed at mixing ratio of 10 to 7, which is the mole ratio of CaO to $Al_2O_3$ of calcium Chloroaluminte. Mixed samples were sintered in the opened sintering reactor and the closed sintering reactor, respectively. The results showed that calcium chloroaluminte was formed at $1,000^{\circ}C$ in both reactors, but the temperature of decomposition of calcium chloroaluminte depended upon sintering reactor type; an opened sintering reactor and a closed sintering reactor, owing to the vaporization velocity of Cl. 본 연구에서는 생활폐기물 소각 비산재를 활용하여 유리화 온도보다 낮은 소결 온도에서 calcium chloroaluminte($11CaO{\cdot}7Al_2O_3{\cdot}CaCl_2$, 본문에서는 CCA로 표기)의 시멘트 광물을 합성하였다. CCA를 합성 시 $Al_2O_3$ 성분 부족한 양은 정수 슬러지를 부 원료로 첨가하였다. 생활폐기물 소각 비산재의 CaO 성분과 정수 슬러지를 10:7로 혼합하여 $900^{\circ}C-1300^{\circ}C$ 소결 온도에 따른 CCA 합성 거동을 관찰하였다. 혼합 시료는 개방형(Opened System) 소결 조건 전기로와 밀폐형(Closed System) 소결 조건 전기로에서 온도에 따른 CCA 합성 거동을 관찰한 결과, CCA 합성은 개방형과 밀폐형 모두 $1,000^{\circ}C$에서 합성이 되었다. 그러나 소성 분위기로 볼 때 개방형보다는 밀폐형의 소성 조건에서 CCA의 합성율이 높았으며, 이는 소각재 소성 과정에서 Cl의 휘발 거동에 따라 CCA의 합성율 및 분해 온도가 결정되는 것으로 나타났다.