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( Soohyun Bae ),( Kwang Won Seo ),( Soyeoun Lim ),( Jong Joon Ahn ),( Yangjin Jegal ),( Seung Won Ra ),( Taehoon Lee ),( Byung Ju Kang ),( Jin Hyoung Kim ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: Cavitary pulmonary tuberculosis (TB) is known to remain infectious for longer periods than non-cavitary pulmonary TB, which is nearly non-infectious with two weeks anti-TB medication. However, there is verly little studies about this, so it is not known whether there is a correlation between the persistence of infectiousness and the number of cavities or volume of cavities. Objectives: The purpose of this study was to identify the quantitative computed tomography features and clinical values to predict the presistence of infectiousness in cavitary TB patients. Method: A total of 304 TB patients were selected from the cohort of TB in Ulsan university hospital. The study subjects were classified into two groups according to the Acid-fast bacilli Ziehl-Neelsen staining in sputum. The two groups were compared with respect to demographic data, clinical characteristics, sputum AFB stain, mycobacterial culture and quantitative CT values. Results: Among 304 patients, 80 were enrolled for analysis. 43 patients (54%) were positive sputum AFB stains. Compared to negative sputum AFB stain group, the positive sputum AFB stain group had more systemic symptom and larger maximal size of cavity. Treatment duration for last culture positive was 37.9 ± 64.7 days (p = 0.01), which is significantly longer in AFB positive group. Conclusion: Cavitary lesion was associated with a infectiousness, more systemic symptom, longer duration of culture conversion. Quantitative analysis of CT showed that volume and size of cavities were associated with persistent infectiousness in TB patients.
SooHyun Bae,Minkyu Han,Changyoung Kim,Hyeji Lee,안종준,김진형,Byung Ju Kang 대한의학회 2020 Journal of Korean medical science Vol.35 No.10
Background: Usually, high-flow nasal cannula (HFNC) therapy is indicated for de novo acute hypoxemic respiratory failure (AHRF). Although only a few researches have examined the effectiveness of HFNC therapy for respiratory failure with hypercapnia, this therapy is often performed under such conditions for various reasons. We investigated the effectiveness of HFNC therapy for AHRF patients with hypercapnia compared to those without hypercapnia. Methods: All consecutive patients receiving HFNC therapy between January 2012 and June 2018 at a university hospital were enrolled and classified into nonhypercapnic and hypercapnic groups. We compared the outcomes of both groups and adjusted the outcomes with propensity score matching. Results: A total of 862 patients were enrolled, of which 202 were included in the hypercapnic group. HFNC weaning success rates were higher, and intensive care unit (ICU) and hospital mortality was lower in the hypercapnic group than in the nonhypercapnic group (all P < 0.05). However, no statistical differences in HFNC weaning success (adjusted P = 0.623, matched P = 0.593), ICU mortality (adjusted P = 0.463, matched P = 0.195), and hospital mortality (adjusted P = 0.602, matched P = 0.579) were noted from the propensity- adjusted and propensity-matched analyses. Additionally, in the propensity score-matched subgroup analysis (according to chronic lung diseases and causes of HFNC application), there was also no significant difference in outcomes between the two groups. Conclusion: In AHRF with underlying conditions, HFNC therapy might be helpful for patients with hypercapnia. Large prospective and randomized controlled trials are required for firm conclusions.
배수현(Soohyun Bae),오원욱(Wonwook Oh),강윤묵(Yoonmook Kang),이해석(Hae-Seok Lee),김동환(Donghwan Kim) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.2
When the PV module is illuminated in a high temperature region, solar cells are also exposed to the high temperature external environment. The operating temperature of the solar cell inside the module is increased, which causes the power drops. Various efforts have been made to reduce the operating temperature and compensate the power of solar cells according to the outdoor temperature such as installing of a cooling system. Researches have been also reported to lower the operating temperature of solar cells by improving the heat dissipation properties of the backsheet. In this study, we conducted a test to measure the internal temperature of each module components and the external temperature when the light was irradiated according to the surrounding temperature. Backsheets with different thermal conductivities were compared in the test. Finally, in order to explain the temperature difference between the solar cell and the outside of the module, we proposed an evaluation method of the heat transfer characteristics of photovoltaic modules with different backsheet.
Rapid Thermal Process를 이용한 실리콘 태양전지의 국부적 후면 전극 최적화
배수현(Bae, Soohyun),박성은(Park, Sungeun),김영도(Kim, Young Do),박효민(Park, Hyomin),김수민(Kim, Soo Min),김성탁(Kim, Seongtak),김현호(Kim, Hyunho),탁성주(Tark, Sung Ju),김동환(Kim, Dongwhan) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
현재 상용화되고 있는 단결정 실리콘 태양전지는 알루미늄 페이스트를 이용하여 후면의 전 영역에 전계를 형성한다. 최근에는 고효율을 얻기 위하여 후면에 패시베이션 효과와 장파장에 대한 반사도를 증가 시키는 SiNx막을 증착 후, 국부적으로 전계를 형성하는 국부 후면 전극(Local back surface field)기술이 연구되고 있다. 본 연구에서는 전면만 텍스쳐 된 단결정 실리콘 웨이퍼를 이용하였다. Plasma Enhanced Chemical Vapor Deposition(PECVD)를 이용하여 전,후면에 SiNx를 증착 하였고 후면의 국부적인 전극 패턴 형성을 위하여 SiNx 식각용 페이스트를 사용한 스크린 프린팅 기술을 이용하였다. 스크린 프린팅을 이용하여 패턴이 형성된 후면에 알루미늄을 인쇄 한 후 Rapid Thermal Process(RTP)를 이용하여 소성 공정 조건을 변화시켰다. 소성 조건 동안 형성되는 후면 전계층은 peak 온도와 승온속도, 냉각 속도에 따라 형상이나 특성이 변화하기 때문에 소성 조건을 변화시키며 국부적 후면 전계 형성의 최적화에 관한 연구를 수행하였다. 패이스트를 이용하여 SiNx를 식각 후 광학 현미경(Optical Microscopy)을 사용하여 SiNx의 식각 유무를 살펴보았고, RTP로 형성된 국부 전계층의 형성 두께, 주변 부분의 형상을 살피기 위해 도핑 영역을 혼합수용액으로 식각하여 주사 전자 현미경(SEM)을 이용하여 관찰 하였다. 또한 후면의 특성을 살펴보기 위해 분광 광도계(UV/VIS/NIR Spectrophotometer)를 사용하여 후면 SiNx층의 유무에 따른 반사도를 비교, 측정 하였다.