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Man Pyo Chung, M.D., Ph.D.,Park Jong Sun,Kim Song Yee,유홍석,Jin Woo Song,정성환,Lee Jae Ha,이홍렬,Choi Sun Mi,김영환,Yonghyun Kim,최혜숙,Lee Jongmin,어수택,Kim Tae-Hyung,Kim Sang-Heon,Lee Won-Yeon,김이형,Lee Hyun Kyung 대한결핵및호흡기학회 2022 Tuberculosis and Respiratory Diseases Vol.85 No.2
Background: The Korea Interstitial Lung Disease Study Group has made a new nationwide idiopathic pulmonary fibrosis (IPF) registry because the routine clinical practice has changed due to new guidelines and newly developed antifibrotic agents in the recent decade. The aim of this study was to describe recent clinical characteristics of Korean IPF patients.Methods: Both newly diagnosed and following IPF patients diagnosed after the previous registry in 2008 were enrolled. Survival analysis was only conducted for patients diagnosed with IPF after 2016 because antifibrotic agents started to be covered by medical insurance of Korea in October 2015.Results: A total of 2,139 patients were analyzed. Their mean age at diagnosis was 67.4±9.3 years. Of these patients, 76.1% were males, 71.0% were ever-smokers, 14.4% were asymptomatic at the time of diagnosis, and 56.9% were at gender-agephysiology stage I. Occupational toxic material exposure was reported in 534 patients. The mean forced vital capacity was 74.6% and the diffusing capacity for carbon monoxide was 63.6%. Treatment with pirfenidone was increased over time: 62.4% of IPF patients were treated with pirfenidone initially. And 79.2% of patients were treated with antifiboritics for more than three months during the course of the disease since 2016. Old age, acute exacerbation, treatment without antifibrotics, and exposure to wood and stone dust were associated with higher mortality.Conclusion: In the recent Korean IPF registry, the percentage of IPF patients treated with antifibrotics was increased compared to that in the previous IPF registry. Old age, acute exacerbation, treatment without antifibrotics, and exposure to wood and stone dust were associated with higher mortality.
김만선 ( Man-sun Kim ),양형정 ( Hyung-jeong Yang ),김정식 ( Jeong-sik Kim ),김선희 ( Sun-hee Kim ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.2
데이타 마이닝을 위하여 수집된 대용량의 데이타를 여과 없이 기계학습에 적용하는 것은 많은 시간과 비용이 요구될 뿐만 아니라 저장 공간면에서도 비효율적이다. 선별적 샘플링은 이러한 상황에서 매우 효율적으로 적용할 수 있도록 원본 데이타의 특성을 가능한 반영하여 새로운 훈련 데이타를 생성하는 방법이다. 본 연구에서는 신경망의 하나인 SOM을 적용한 선별적 샘플링을 수행하는데 있어서 여러 가지 선택 문제를 효과적으로 해결하기 위한 실험을 수행한다. 실험 결과로는 두 가지 결과를 얻었다. 1) 충분한 맵 사이즈를 선택해야 학습 데이타의 함축적인 특성을 잘 반영한다, 2) 선택적 샘플링을 위한 유닛선택 방법에서는 의미없는 유닛을 제거함으로서 분류 성능향상을 얻을수 있다.
김형만(Hyung-Man Kim),최영(Young Choi),서용위(Yong-Wie Seo),이동제(Dong-Je Lee),최주원(Jao-Won Choi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Thermal judder has been effected by the thermal deformation of the brake disk. High friction heat is generated during braking and concentrated to particular regions of the brake disk. The heat is transferred to the air through the brake disk. Because the temperature distribution on the disk is irregular, thermal deformation has been occurred during braking. In this study, thermal deformation analysis of brake disk by FEM has been practiced. The results of the analysis show the deformed shape and temperature distribution of the brake disk. The deformed shape due to the thermal judder has been verified at the early stage of the braking.
김형만(Hyung-Man Kim),배명환(Myung-whan Bae),박재윤(Jae Yoon Park) 한국자동차공학회 2001 한국자동차공학회 Workshop Vol.2001 No.-
Numerical simulation on the EGR system of a diesel engine is investigated for the simultaneous reductions of NOx and soot emissions. As an example of the simulation, EGR system with the bypass venturi was optimized using the simulation codes of I-D <br/> AVL-BOOST and 3-D AVL-FIRE. Simulation capabilities of AVL-FlRE include spray mixing, various combustion models and radiation sub-models to model the diesel engine combustion. AVL-BOOST is used as a simulation tool for numerical engine cycle investigations. The NOx formation is based on the extended Zeldovich mechanism, which predicts the thermal contribution to NOx. The concentration of soot in the exhaust is governed by its formation and oxidation processes during the engine cycle. AVL-FlRE and AVL-BOOST simulation codes have proven to be reliable tools.