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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.
유전자 알고리즘을 이용한 퍼지제어 프로그램의 자동 설계
박세환,이광형(Seihwan Park),Hyung-Kwang Lee 한국정보과학회 1998 정보과학회논문지(B) Vol.25 No.9
Fuzzy control has been used successfully in many practical applications. In traditional methods, experience and control knowledge of human experts are needed to design fuzzy controllers. However, it takes much time and cost. In this paper, an automatic design method for fuzzy controllers using genetic algorithms is proposed. The proposed method includes an effective encoding scheme and new genetic operators. Those proposed genetic operators maintain the correspondence between membership functions and control rules. It can generate a new fuzzy control program. The proposed method is applied to the truck backing problem and the cart centering problem. The result of experiment has been satisfactory as compared with other design methods using genetic algorithms. 퍼지제어는 많은 실제 분야에서 성공적으로 사용되어 왔다. 포지제어기를 설계하는 데 있어서 전통적인 방법은 전문가의 경험과 지식을 사용하는 것이다. 그러나 이 방법은 많은 시간과 비용이 필요하다. 따라서 전문가의 개입없이 퍼지제어기를 설계하는 방법이 연구되어 왔다. 본 논문에서는 유전자 알고리즘을 이용하여 퍼지제어기를 설계하는 방법을 제안한다. 제안된 방법은 효과적인 부호화 방법과 퍼지제어기의 특성을 고려한 유전 연산자로 구성된다. 이것은 새로운 퍼지제어 프로그램을 생성시킬 수 있다. 본 논문에서는 성능 평가를 위해 트럭 후진 주차 문제와 수레 제어 문제와 같은 실제적인 문제들에 적용시켜 만족할만한 결과를 보였다.
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.
2-bit/cell Folded Split Gate Flash Memory의 제작 방법
박세환(Se Hwan Park),박일한(Il Han Park),조성재(SeongJae Cho),윤장근(Jang-Gn Yun),이정훈(Jung Hoon Lee),이동화(Dong Hua Li),김두현(Doo-Hyun Kim),이길성(Gil Sung Lee),김윤(Yoon Kim),이종덕(Jong Duk Lee),박병국(Byung-Gook Park) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
A new 2-bit/cell SONOS flash memory device is designed. The device has recessed channel and a supplementary gate named as a select gate. The designed structure looks like a folded form of conventional one, so we call the device Folded Split Gate (FSG) flash memory
박세환(Se-Hwan Park),김종윤(Jong-Yun Kim),이영현(Young-Hyun Lee) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
Due to the IoT and wearable devices including P2P/M2M/P2M devices popularization, explosive increment of data traffic is born development needs of 5G mobile communication system in high-speed/high-volume/high-quality. In this study, will explain on the 5G service prospect and technology development issues, industry development strategy, contemporary review in 5G system for the next generation wireless communication.