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정상 폐활량을 보이는 성인 환자에서 $FEF_{25{\sim}75%}$를 통한 기관지확장제 반응의 예견
박세환,이승엽,강승모,선춘식,김현경,이병훈,이재형,김상훈,Park, Se-Hwan,Lee, Seung-Yup,Kang, Seung-Mo,Seon, Choon-Sik,Kim, Hyun-Kyung,Lee, Byoung-Hoon,Lee, Jae-Hyung,Kim, Sang-Hoon 대한결핵및호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.71 No.3
Background: When patients with chronic respiratory symptoms have a normal spirometry result, it is not always easy to consider bronchial asthma as the preferential diagnosis. Forced expiratory flow between 25% and 75% of vital capacity ($FEF_{25{\sim}75%}$) is known as a useful diagnostic value of small airway diseases. However, it is not commonly used, because of its high individual variability. We evaluated the pattern of bronchodilator responsiveness (BDR) and the correlation between $FEF_{25{\sim}75%}$ and BDR in patients with suspicious asthma and normal spirometry. Methods: Among patients with suspicious bronchial asthma, 440 adult patients with a normal spirometry result (forced expiratory volume in one second [$FEV_1$]/forced vital capacity [FVC] ${\geq}70%$ & $FEV_1%$ predicted ${\geq}80%$) were enrolled. We divided this group into a positive BDR group (n=43) and negative BDR group (n=397), based on the result of BDR. A comparison was carried out of spirometric parameters with % change of $FEV_1$ after bronchodilator (${\Delta}FEV_1%$). Results: Among the 440 patients with normal spirometry, $FEF_{25{\sim}75%}%$ predicted were negatively correlated with ${\Delta}FEV_1%$ (r=-0.22, p<0.01), and BDR was positive in 43 patients (9.78%). The means of $FEF_{25{\sim}75%}%$ predicted were $64.0{\pm}14.5%$ in the BDR (+) group and $72.9{\pm}20.8%$ in the BDR (-) group (p<0.01). The negative correlation between $FEF_{25{\sim}75%}%$ predicted and ${\Delta}FEV_1%$ was stronger in the BDR (+) group (r=-0.38, p=0.01) than in the BDR (-) group (r=-0.17, p<0.01). In the ROC curve analysis, $FEF_{25{\sim}75%}$ at 75% of predicted value had 88.3% sensitivity and 40.3% specificity for detecting a positive BDR. Conclusion: BDR (+) was not rare in patients with suspicious asthma and normal spirometry. In these patients, $FEF_{25{\sim}75%}%$ predicted was well correlated with BDR.
Status of Development of Pyroprocessing Safeguards at KAERI
박세환,안성규,장홍래,한보영,김봉영,김동선,김호동,이채훈,오종명,서희,신희성,원병희,구정회,Park, Se-Hwan,Ahn, Seong-Kyu,Chang, Hong Lae,Han, Bo Young,Kim, Bong Young,Kim, Dongseon,Kim, Ho-Dong,Lee, Chaehun,Oh, Jong-Myeong,Seo, Hee,Shin, Hee Korean Radioactive Waste Society 2017 방사성폐기물학회지 Vol.15 No.3
The Korea Atomic Energy Research Institute (KAERI) has developed a safeguards technology for pyroprocessing based on the Safeguards-By-Design (SBD) concept. KAERI took part in a Member-State Support Program (MSSP) to establish a pyroprocessing safeguards approach. A Reference Engineering-scale Pyroprocessing Facility (REPF) concept was designed on which KAERI developed its safeguards system. Recently the REPF is being upgraded to the REPF+, a scaled-up facility. For assessment of the nuclear-material accountancy (NMA) system, KAERI has developed a simulation program named Pyroprocessing Material Flow and MUF Uncertainty Simulation (PYMUS). The PYMUS is currently being upgraded to include a Near-Real-Time Accountancy (NRTA) statistical analysis function. The Advanced Spent Fuel Conditioning Process Safeguards Neutron Counter (ASNC) has been updated as Non-Destructive Assay (NDA) equipment for input-material accountancy, and a Hybrid Induced-fission-based Pu-Accounting Instrument (HIPAI) has been developed for the NMA of uranium/transuranic (U/TRU) ingots. Currently, performance testing of Compton-suppressed Gamma-ray measurement, Laser-Induced Breakdown Spectroscopy (LIBS), and homogenization sampling are underway. These efforts will provide an essential basis for the realization of an advanced nuclear-fuel cycle in the ROK.
Se Hwan Park(박세환),Moon Gul Lee(이문걸) 한국산업경영시스템학회 2017 한국산업경영시스템학회지 Vol.40 No.1
Artillery fire power due to effectiveness which is hard to predict well-planned and surprising attack can give a fear and shock to the personnel and is a very core weapon system and takes a critical role in wartime. Therefore in order to maximize operational effectiveness, Army required protecting artillery and takes a quick attack action through rapid construction of artillery’s positions. The artillery use artillery’s position to prevent exposure by moving to other position frequently. They have to move and construct at new artillery’s positions quickly against exposing existed place by foe’s recognition. These positions should be built by not manpower but engineering construction equipment. Because artillery positions have to protect human and artillery equipment well and build quickly. Military engineering battalion have lots of construction equipment which include excavator, loader, dozer, combat multi-purposed excavator, armored combat earthmover dump truck and so on. So they have to decide to optimal number of Team combining these equipments and determine construction sequence of artillery’s position in operational plan. In this research, we propose to decide number of Team efficiently and allocate required construction’s positions for each Team under constraints of limited equipments and time. To do so, we develop efficient heuristic method which can give near optimal solution and be applied to various situation including commander’s intention, artillery position’s priority or grouping etc. This heuristic can support quick and flexible construction plan of artillery positions not only for using various composition’s equipment to organize Teams but also for changing quantity of positions.
유한요소 해석을 이용한 PS 텐던 외부 자화 용 센서 최적 설계
박세환 ( Park Se-hwan ),김학선 ( Kim Hak-sun ),김준경 ( Kim Junkyeong ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
현재 공용중인 PSC I형 거더 교량의 경우 공용연수에 따라 노후화되어 안전등급이 지속적으로 낮아지고 있지만, 안전도의 핵심인 PSC 교량의 내부 PS 텐던의 긴장 응력이 현재 시행하고 있는 정밀안전진단방법의 경우 정확한 정보를 파악하기가 어려운 실정이다. 따라서 유한요소 해석을 이용하여 외부 비접촉형 EM 센서의 검증을 진행 함으로써, 원거리 자기장에 의한 PS 텐던의 외부 자화 및 이를 이용한 긴장 응력 계측을 위한 센서의 최적 설계에 대한 연구를 진행하였다. 자화를 위한 양측 자화 코일의 거리는 I형 거더의 하부 두께를 고려하여 양측 자화 코일의 거리를 약 1.5[m]로 설정하였으며 유한요소 해석 결과 PS텐던 위치에서 생성되는 자속밀도가 약 0.2[mT]로 측정되었으며 이를 이용하여 내부 텐던의 자화가 가능함을 검증하였다.