벽 일체형 채광장치의 성능평가 연구

송규동,이주윤,유정연 대한건축학회 2004 대한건축학회논문집 Vol.20 No.12

Recently, various daylighting systems have been developed and applied to buildings However, existing daylighting systems are of no practical use due to a high initial cost and difficulties in maintenance In addition, there is a main problem of securing sufficient additional space for collecting daylight and to be available in the overcast sky A wall-integrated daylighting system, which is the subject of this study and doesn't need additional space for collecting daylight, is a very useful daylighting system, because it can substitute for a vertical wall of a building The purpose of this study was to evaluate the daylighting performance of the wall-integrated daylighting system using two mock-up models The performance of the general windows were compared with that of the wall-integrated daylighting system placed on the windows in terms of illuminance distribution on the work plane at the height of 75cm and illuminance distribution on the south wall Also The purpose of this study is to find methods to minimize glare problems of a newly developed wall-integrated daylighting system A total of six glare reduction methods were comparatively tested through measurements with physical scale models The six glare reduction methods included light-guiding ceiling, planer light shelf, parabolic light shelf, horizontal louvers, vertical louvers and prismatic panel, all of which were attached to the wall-integrated daylighting system The measurements were conducted under direct sunlit conditions for the winter solstice, summer solstice and the equinox

관상동맥 누공에 의한 급성 심근 경색 1예

서유승,최재웅,송창섭,조용범,양진수,박준섭,정인수 대한내과학회 2003 대한내과학회지 Vol.65 No.2

관상동맥 동정맥루 기형은 매우 드문 질환으로 치료가 불필요한 경우가 대부분이나 coronary steal 현상으로 인해 증상이 발생하거나 합병증이 발생한 환자에 대해선 치료를 요한다. 최근에는 시술에 적합한 누공을 가진 선택된 환자군을 대상으로 카테터를 이용한 중재적 시술이 시행되어 수술적 치료와 유사한 결과를 얻고 있다. 저자들은 젊은 남자에서 관상동맥 동정맥루 기형과 동반된 급성 심근 경색증을 진단하여 비 수술적 방법인 카테타 코일 색전술로 성공적 치료 후 증상 및 심근 재관류에 호전을 보인 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. We report a case of coronary fistula between the left anterior descending and main pulmonary artery complicating acute non-Q wave myocardial infarction. A 27-year-old man visited emergency department because of severe chest pain lasting two hours. The electrocardiogram showed ST segment elevation in precordial leads V3~6. Cardiac enzymes were as follows;CK-MB:36.44 IU/L T-T:0.489 ng/mL, CPK:542 IU/L, and LDH:475 IU/L. The thallium-201 dipyridamole stress perfusion scan showed perfusion defect and reversed redistribution in the anteroseptal wall. The coronary angiogram revealed coronary artery fistula between the proximal left anterior descending artery and main pulmonary artery without significant stenoses of coronary arteries. The result of ergonovine test was negative. After micro-coil embolization to the coronary fistula, symptoms were improved. Follow-up thallium-201 scan showed normalized blood flow in the left anteroseptal wall.

Polaron Hopping in the K_(2)O · B_(2)O_(3) · V_(2)O_(5) Glasses

차유정,강재필,홍성덕,김복수,김영훈,서용문,송승기 명지대학교 자연과학연구소 2005 자연과학논문집 Vol.24 No.-

K_(2)O · B_(2)O_(3) · V_(2)O_(5) 계 유리의 조성비에 따른 밀도, 굴절율, 전이온도, 천이금속이온비율 등과 직류 전기 성질을 100~450K 온도영역에서 연구하였다. 실험결과를 비정질 반도체에 관한 전기전도에 대한 이론 모델을 이용하여 분석하였다. 고온 영역에서는 직류전도도의 온도 의존성을 Mott의 포논-도움껑충뛰기 전도모델로 분석할 수 있었다. 활성화에너지는 0.28~0.33 eV로 시료내 V_(2)O_(5) 의 양이 증가할수록 감소하는 경향을 보인다. 저온 영역에서 직류 전기전도도는 Mott의 가변거리 껑충뛰기(variable-range hopping)전기전도도와 잘 일치하며, N(E_(F))값은 국지화 상태에서와 같다. The dc conductivity of K_(2)O-B_(2)O_(3)-V_(2)O_(5) glasses has been investigated in the temperature range 100~450K and physical parameters such as density, refractive indices, glass transition temperature and fraction of reduced transition-metal ion, were observed for various compositions. The experimental results are analyzed with reference to theoretical models proposed for electrical conduction in amorphous semiconductors. The analysis shows that at high temperature region the temperature dependence of the dc conductivity is consistent with Mott's model of phonon-assisted hopping of small polarons. The values of activation energy are 0.28~0.33 eV and decrease with increasing V_(2)O_(5) content in the sample. The lowtemperature dc conductivity data can be well fitted to Mott's variable-range hopping conductivity and the values of N(E_(F)) are also reasonable for localized states.

법률비서 : 합동법률사무소 변호사 비서를 중심으로

구은경,송화영,문선화,이유경,정혜영,최보인 이화여자대학교 법정대학 비서학과 1995 비서학연구 Vol.- No.15

人工甘味料의 合成過程에 對한 再考

박숙자,안송자,유영자,윤정자,윤종은,이명재,정규영,황민자 梨花女子大學校 藥學硏究所 1963 梨花藥學硏究 Vol.- No.4

보이드 생성기구에 의한 복합조직강의 연성 파괴거동에 관한 연구

吳澤烈,崔明振,楡龍錫,金松正 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-

Ductile Fracture of Dual Pase Steel begins with void nucleation, at Martensite-Ferrite interface or deformed Martensite particle. In this study void nucleation, void growth, void volume fraction and void coalescence at given strain were studied in dual phase steel. Therefore, by means of the heat treatment of low corbon steel the study deal with void nucleation and void growth for ferrite grain sizeof dual phase steel. Void nucleaton and void growth with increasing strain are shown depend upon the ferrit grain size. The number of voids and volume fraction of voids generary increase as ferrite grain size decrease. At the close to fracture the void coalescence in the direction of the applied tensile stress, but near the fracture surface they linked in direction transverse to the tensile axis.

흡연에 의한 급성 호산구성 폐렴 2예

박종빈,김학렬,주현준,유태양,신성남,신정현,송정섭,황기은,김소영,양세훈,정은택 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

최근 흡연을 시작한 젊은 성언에서 급성 호산구성 폐렴의 발생에 대한 증례가 보고되고 있다. 급성 호산구성 폐렴은 대개 발열을 동반하기 때문에 초기에는 감염성 폐렴으로 잘못 진단, 치료되는 경우가 많다. 아직 정확한 병태 생리 및 조직학적 소견은 밝혀져 있지 않지만 병력 청취 및 임상 양상, 방사선 소견의 관찰을 통해 급성 호산구성 폐렴을 의심하고, 진단을 위해 기관지 폐포 세척액 검사를 시행한다면 좀 더 쉽게 진단 내릴 수 있을 것이다. 본 저자들은 최근 처음 시작한 흡연에 의해 발생한 급성 호산구성 폐렴을 진단하고, 스테로이드를 투여하여 성공적으로 치료한 환자 2예를 경험하였기에 이를 문헌 고찰과 함께 보고하는 바이다. Acute eosinophilic pneumonia(AEP) is characterized by acute febrile respiratory illness associated with diffuse pulmonary infiltration and pulmonary eosinophilia. The specific etiology for acute eosinophilic pneumonia is elusive. By some investigators, cigarette smoking is suggested as a causative substance which can cause AEP. In recent, the authors experienced two cases of AEP following cigarette smoking. Both cases had characteristic features including age around 20 years, new onset smoking before occurance of AEP, diffuse infiltration on chest radiography, pulmonary eosinophilia based on bronchoalveolar lavage and acute improvement after steroid therapy. These clinical features are resemble with previous smoking induced AEP case reports. Base on these clinical features, cigarette smoking associated AEP could be diagnosed more easily.

^(7)Li, ^(87)Rb과 ^(27)Al NMR을 이용한 (K_(1-x)Li_(x))_(2)SnCl_(6), (K_(1-x)Rb_(x))_(2)SnCl_(6)와 K_(2)SnCl_(6):Al^(3+)의 상전이 근처에서의 결정 동력학 연구

김복수,김영훈,강재필,백아영,차유정,김민경,서용문,송승기 명지대학교 자연과학연구소 2004 자연과학논문집 Vol.23 No.-

K_(2)SnCl_(6)는 antifluoride계에 속하는 결정으로서 K_(2)SnCl_(6)에 Li^(+)를 첨가하여 ^(7)Li 핵자기공명(NMR)을 측정하여 동형(isomorphic) 혼합결정(K_(1-x)Rb_(x))_(2)SnCl_(6)와 비동형(nonisomorphic) 혼합결정 K_(2)SnCl_(6):Al^(3+)에서의 핵자기공명(NMR), ^(87)Rb NMR과 ^(27)Al NMR의 측정값과 비교하였다. Rb^(+) 이온은 K_(2)SnCl_(6)의 K^(+)이온을 대신해 동형 결정을 이루며, Al^(3+)이온은 Sn^(4+)이온을 대치하면서 비동형 결정을 이루는데 Li^(+)이온 또한 K^(+)이온을 대신하는 동형 혼합결정과 유사한 결과 값을 얻을 수 있었다. 이 연구 결과는 종래의 Cl-NQR 연구 결과와 비교함으로서 K_(2)SnCl_(6)의 동력학적 특성과 구조 상전이 근처에서의 임계현상을 새로운 관점에서 볼 수 있는 가능성을 보여주었다. ^(7)Li, ^(87)Rb and ^(27)Al NMR have been investigated in the isomorphic and nonisomorphic impurity doped crystals (K_(1-x)Li_(x))_(2)SnCl_(6), (K_(1-x)Rb_(x))_(2)SnCl_(6) and K_(2)SnCl_(6):Al^(3+) as a supplementary to the previous Cl NQR studies in these crystals. The results yielded that the features of NMR spectra for both types of crystals are roughly in line with the systematic trends shown in the Cl NQR in these crystals, though the outstanding characteristics exhibited in the Cl NQR become in the case of the NMR of the doped impurities in crystals somewhat weakend. This is due to the degradation of the role of the local field from the main hamiltonian in NQR to the subsidiary in NMR. Each NMR result of the iso/nonisomorphic crystals has been analyzed in terms of the 'impurity induced dynamic lattice defects' for K_(2)SnCl_(6):Al^(3+) and the 'static primary impurity effects' for (K_(1-x)Rb_(x))_(2)SnCl_(6) and (K_(1-x)Li_(x))_(2)SnCl_(6) respectlvely.

Nitrogen-doped TiO₂ films as drug-binding matrices for the preparation of drug-eluting stents

Song, Sun-Jung,Jung, Kyoung Woon,Park, Yu Jeong,Park, Jun,Cho, Myung Duck,Jeong, Myung Ho,Kim, Yong Sook,Cho, Dong Lyun Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.22

<P>Nitrogen doped-TiO<SUB>2</SUB> thin film was deposited by plasma enhanced chemical vapour deposition (PECVD) process and its applicability as a drug-binding matrix was investigated in the preparation of drug eluting stents. N–TiO<SUB>2</SUB> film was deposited at 5 W and uniformly covered metallic stent surfaces. Films showed excellent mechanical stability and good adhesion. Alpha lipoic acid, heparin, and abciximab could then be grafted onto the N–TiO<SUB>2</SUB> film through ester bond formation after water plasma modification of the films' surfaces. Drug-grafted N–TiO<SUB>2</SUB> films showed smooth surfaces and good blood compatibility in <I>in vitro</I> platelet adhesion tests. The films maintained uniform coverings, without peeling, even after expansion by a balloon catheter. Grafted-heparin and abciximab could be released continuously for three weeks from drug-grafted N–TiO<SUB>2</SUB> stents in <I>in vitro</I> drug release test. Such immunosuppressive and antiproliferative drug-grafted N–TiO<SUB>2</SUB> film is expected to minimize potential problems related to organic polymers and the risk of direct contact of a bare metal surface with a blood vessel. Hence, the N–TiO<SUB>2</SUB> films prepared in this study are promising alternatives to organic polymers for the preparation of drug-eluting stents.</P> <P>Graphic Abstract</P><P>A PECVD coated nitrogen-doped TiO<SUB>2</SUB> film was applied for the preparation of drug-eluting stent. The films maintained uniform coverings after expansion by a balloon catheter. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm03994b'> </P>

Benzo(a)pyrene has effects on the repression of melanogenesis in B16F10 mouse melanoma cells

( Song Hee Han ),( Byung Gon Choi ),( Min Jung Kim ),( Hae Jeong Youn ),( Soo Young Kim ),( Nam Kyung Roh ),( Ho Jung Jung ),( Yu Ri Kim ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2

Background: Benzo(a)pyrene (BaP) is one of the various toxic substances in polluted air. In previous studies, it was reported that BaP accumulates in melanin-containing tissues. However, it remains unclear whether BaP regulates melanogenesis in melanocytes Objectives: We examine the effects of BaP on the melanin synthesis pathway, as well as its effects on the repression of melanogenesis in B16F10 mouse melanoma cell Methods: The melanin content was determined by optical density at 415 nm and normalized to the amount of total protein. We used Western blot with antibodies against MITF, tyrosinase, Tyrp1, Tyrp2 to detect specific proteins. In vitro tyrosinase activity was determined using mushroom tyrosinase. Quantitative real-time PCR was used to determine relative target mRNA expression Results: The mRNA expression of Typ and Tyrp1 were significantly inhibitied in the presence of BaP compared to control メ-MSH treated B16F10 cells. BaP repressed Mitf mRNA and protein expression in メ-MSH treated B16F10 cells. BaP significantly decreased melanin synthesis by Microphthalmia-associated transcription factor-mediated regulation of tyrosinase and tyrosinase-related protein 1 expression in B16F10 mouse melanoma Conclusion: We hypothesize that BaP interrupts the UV protection mechanism by repressing melanin synthesis in the skin, because メ-MSH-induced melanogenesis, the major protection mechanism in UV-exposed skin, is significantly decreased by BaP in B16F10 cells