실리카흄을 흔입한 고강도 콘크리트 개발

홍창우,김태경,김경진,김성환,김남윤,심도식,이정호,윤청호,백민경,원치문,박제선,이주형,정경일 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

콘크리트 구조물이 대형화됨에 따라 설계단면이 증대되어 상대적으로 많은 경제적 손실을 부담하게 된다. 따라서 단면을 감소시키면서도 소요의 하중에 안전한 구조물을 건설하기 위해서는 우선적으로 구조물 건설에 기초가 되는 고품질, 고내구성의 고강도 콘크리트 개발이 절실히 요구된다 본 연구에서는 일정 시멘트비 및 혼화재 비율하에서 소요의 워커빌리티가 확보되는 고강도 콘크리트를 시간과 온도의 변화에 따라 증기 양생하여, 압축, 인장, 휨강도 뿐만 아니라 파괴특성을 실험적으로 연구하였다. 시료 제작시 시멘트 입자 사이의 공극 및 불연속 영역을 충전하여 고밀도화하기 위한 콘크리트용 혼화재로 시멘트 비표면적이 상당히 작은 초미립 분말인 실리카흄을 이용하였다. 또한 AE감수제 및 고성능 유동화제를 사용하여 혼화재의 첨가에 의하여 발생될 수 있는 워커빌리티의 감소를 방지하였다. 실험결과에 의하면 일정 양생 지속 시간하에서 온도의 증가에 따라 콘크리트의 압축, 인장 및 휨강도가 전반적으로 증가하였다. 동일하게 일정 온도하에서 양생 지속시간이 커짐에 따라 강도들이 증가됨을 알 수 있었다. 따라서 상대적으로 높은 온도와 긴 지속 양생 조건하에서 파괴에 대한 저항력이 크게 나타났다. The compressible, tensible, and flexibleresistance of the high strength concrete is analyzed by the experimentation in the present study. For the test, we cure several samples with the silica fume as a mixture being become dense the spaces between the particle of cement under the variation of both the temperature and the curing-interval. Then, the superplasticizer and the ezcon are also used to satisfy the required workability for construction. The compressible, tensible, and flexible resistances to a stress are increased as increasing the temperature and the time interval for the curing. Therefore it is concluded that the overal fractural and mechanical properties is improved by mixing the silica fume into the cement.

凍結深度 算定에 대한 硏究

민홍기,류제천,김송만,박춘수 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

Korea has the ground which freezes in winter and melts in warmer seasons by turns. Therefore, in designing civil-structures or buildings on such ground, the depth of seasonal frost penetration must be considered. In this paper, approximate contours of the maximum depth of frost penetration in Korea is presented. The National Construction Research Institute of Korea has measured the depth of the frozen ground covering all the area of South Korea during the ten years ranging through 1980. The measurement were made for the frozen ground at random but intended for the most frost-susceptible soils. The contour of the maximum depth of the frost penetration is drawn on a map with data collected during the ten years. It is known that the maximum depth of the frost penetration is related to freeze index values. An empirical formula expressing the relation is suggested, in which the depth is proportional to the one-fifth power of the air freezing index values.

서울의 PPNG 발생 빈도(1991-1992)

김재홍,윤기범,박평원,김영진,전경민,김영태,김중환,곽호,구상완,송민석,유옥,지혜구,김동원,문상은,박영립,정승호,성범진,성순제,엄주용,황정열,이기홍,이주협,전태진 대한화학요법학회 1994 대한화학요법학회지 Vol.12 No.1

The prevalence of PPNG among pretreated gonorrhea cases isolated at the STD clinic of Choong-Ku Public Health Center in Seoul has been studied and reported annually since 1981. In 1991, 123 strains of N.gonorrhoeae were isolated, among which 58(47.1%) were PPNG. In 1992, 98 starains of N.gonorrhoeae were isolated, among which 51(52.0%) were PPNG. In all, 109(49.3%) strains were found to be PPNG among 221 strains isolated between 1991-1992. The prevalence of PPNG in Seoul showed increased tendency till 1989, thereafter, it has been stationary or slightly decreasing.

분포형 유출모형을 이용한 홍수예경보 시스템

조홍제,임민수,윤종춘 울산대학교 1999 공학연구논문집 Vol.30 No.1

본 연구에서는 격자 물수지 기법을 이용하여 기존의 분포형 유출모형인 TOPMODEL (Topograpy-based hydrological model)을 수정 보완하고, 실제의 강우현상을 표현하는 연속강우형 곡선인 무차원 삼각형 우량주상도로써 강우의 시간분포에 따른 유출모의를 통하여 홍수예경보 시스템 개발에 있어서의 방법을 제시하였다. 모형에 필요한 지형인자를 추출하기 위해서는 국립지리원에서 제작된 1:5,000 수치지도를 이용하여 대상유역인 사연댐 유역을 가로, 세로 50m 크기의 격자로 분할하여 각각의 격자가 가지고 있는 독립적인 입력자료들을 추출하였다. 또 개개의 격자마다 유출해석을 위한 수문정보를 입력하여 격자별 물수지를 계산하고 단방향 흐름경로 알고리듬에 의하여 지표흐름을 추적함으로써 유역의 전반적인 시간적, 공간적 수문량을 파악하였다. 이 과정은 지리정보시스템(GIS,Geographic Information System)을 활용하였으며 GIS 도구 중의 하나인 ARC/INFO의 ARC 와TIN 그리고 GRID 모듈을 이용하여 모형의 실행에 필요한 입력자료를 추출하였고 ARC/INFO의 내장언어인 AML(Arc Macro Language)을 사용하여 모형의 실행 및 결과를 출력하였다. The purpose of present study is to modify TOPMODEL(Topography-based hydrological model) of existing distributed runoff model by grid-based water balance method and present flood forecasting and warning system development method using a actual rainfall pattern from the dimensionless triangular distribution. The geographic data to simulate model used physiographic map scale 1:5,000 manufactured by the Geography government houses. The test area selected SayeonDam watershed and that was divided into horizontally and vertically size 50m raster cell. besides, as each grid cell had hydrologic data, the model calculated grid-based water balance and analyzed general spatially=temporally hydrologic information of watershed with a routing surface flow by single flow direction algorithms. The supported all grid data used ARC. TIN, GRID modules and AML(Arc Macro Language)of Arc/Info one of the GIS/(Geographic Information system) tool.

비선형 캐리어 제어 부스트 정류기 특성에 관한 연구

이제환,전기영,조정민,한홍일,한경희 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-

Average-current mode controlled boost rectifier is most universally used at present, While the method gives high power factor, low harmonics distortion, has drawbacks such as 3-feedback loop, complex component, difficulty of control-circuit design, and high cost. Research for improving these problem has been carried out, and Nonlinear Carrier(NLC) Control method is representative. This control method has easy algorithm for control, and its feedback loop and control components are reduced. In this paper, the control method was evaluated by simulation through Matlab/Simulink, and experimented with 550W boost rectifier. As the result, that can get high power factor above 0.95 and low harmonic distortion was confirmed. Also, a good dynamic response on line and load variation was confirmed.

골다공증 진단에 피부 두께의 임상적 유용성 평가

박원근,최민주,김호찬,조성제,박전홍 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

The study was carried out to examine how much clinically useful was the skin thickness in diagnosis of osteoporosis. The project was to look into not only the presumption that patients with osteoporosis have the skin loss at the similar rate of the reduction in the collagen content of the bone but also the correlation between the collagen content and the skin thickness. The skin thickness was measured on the dorsal hand(right) of the patients using an ultrasonic technique with a 20 MHz focused ultrasonic transducer. Measurements of the bone density of the patients were made on both the lumbar spine (L2-4) and the femoral neck using Dual­Energy X­ray Absorptionmeter(DEXA, Norland). An ultrasonic bone densitometer(Mark 6000, Medison Co. Korea) was taken to measure the speed of sound (SOS) on the calcaneus. It was observed that there were some degrees of correlation between the bone density obtained by the DEXA and the SOS of the calcaneous (P<0.01). There was no evidence that the skin thickness was correlated with the DEXA produced bone density and ultrasonically measured SOS.

설계강우의 시간적 분포모형 적용성 연구

서진호,이상배,조흥제,민병형 東亞大學校 海洋資源硏究所 1995 硏究論文集 Vol.8 No.1

위천대표유역의 11녀간의 단독강우사상 3,550개를 선별하여 Yen-Chow의 삼각형 및 사다리꼴, Huff, Pilgrim-Cordery 및 Mononobe의 방법에 의한 지속시간별 설계강우의 시간적분포 특성치를 제시하였다. Yen-Chow 방법의 삼각형분포의 특성치 a 값은 0.44에서 0.50까지 분포하였고, 사다리꼴은 지속시간이 길어질수록 무차원 특성변수 h 의 값이 점차 커지는 경향을 나타내었다. Huff 4분기법에 의한 분석결과는 2구간 강우가 지배적이고 3구간 강우가 낮은 분포를 나타내었다. 또한 Pilgrim-Cordery 방법에서는 6시간까지는 점방위 강우형이고, 6시간이상은 점차 후방위로 변화하였다. Mononobe 방법은 시간별 강우량을 중앙집중형으로 나타내었다. 본 방법들의 적용성을 검토하기 위해 위천유역의 32개 관측 강우-유출자료를 이용하였고, 분석결과 Yen-Chow 방법의 삼각형분포가 비교적 재현성이 높게 나타났다. 이들 설계강우의 시간적분포모형들은 미계측유역의 유출해석에 중요한 수단을 제공할 것으로 판단된다. The historical data from 3,550 event storms during 11 years in Wi-stream basin have been used to investigate the statistical parameter of the time distribution for design storms by the method of Yen-Chow, Huff, Pilgrim-Cordery and Mononobe. The dimensionless value of triangular hyetograph, a , ranges from 0.44 to 0.50 and trapezoidal hyetograph, h , value increases as the duration time is getting longer in Yen-Chow method. In the Huff, the second-quartile storms occurred most frequently and third-quartile storms occurred most infrequently. In the Pilgrim-Cordery, the shapes for shorter than 6-hour durations are advanced tendency. However, for longer than 6-hour durations show delayed tendency. In the Mononobe, every one hour rainfall occured Centered Type. The application of these methods for each duration time was tested by using the observed rain-fall-runoff data of Wi-stream basin. As a result, the reappearance of hydrographs of triangular hyetograph by Yen-Chow method showed promising, and it was approved to be used for prediction of the ungaged basins.

사람 뇌척수액중 Transthyretin의 항산화작용

양성렬,최기오,박종근,류문희,홍석노,김수한,안봉환,이제혁,이민화 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.4

Protective effects of human cerebrospinal fluid antioxidants against enzyme inactivation caused by metal-catalyzed oxidation systems were investigated. When purified glutamine synthetase(GS) was incubated with human cerebrospinal fluid(CSF), the enzyme was progressively inactivated. Catalase and EDTA could inhibit the enzyme inactivation by 50-80%. Small-molecular(Mr< -10,000) fraction of CSF inactivated the exogenous GS, but large-molecular(Mr> -10,000) fraction did not. The GS inactivation by the small-molecular fraction was also markedly inhibited by catalase and EDTA. These results suggested that metal-catalyzed oxidation is involved in the GS inactivation by the small-molecular fraction of CSF. Dithiothreitol(DTT) was shown to inhibit almost completely the oxidative inactivation of GS by CSF. However, DTT inhibited only partially the oxidative inactivation of GS caused by small-molecular fraction of CSF. When large-molecular fraction of CSF was separated by anion-exchange HPLC chromatogrpahy, there was a peak of antioxidant activity inhibiting the small-molecular fraction-induced GS inactivation in the presence of DTT. The antioxidant activity was neutralized by monoclonal antibodies to transthyretin. Purified transthyretin was found to efficiently inhibit ascorbate/Cu^(2+)-induced GS inactivation in the presence of DTT. Uric acid and glucose did not show any protective effect on the GS inactivation in the same condition. The above results suggest that metal-catalyzed oxidation occurs normally in human CSF, and that transthyretin may play an important role as a CSF antioxidant in protecting proteins from metal-catalyzed oxidation.

새만금 시설원예단지 적지선정을 위한 기상환경 주제선정

강동현(Dong Hyeon Kang),이시영(Si Young Lee),김종구(Jong Koo Kim),최홍기(Hong Ki Choi),박민정(Min Jung Park),연제성(Je Sung Yeon),손진관(Jin Kwan Son) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.4

본 연구에서는 새만금 개발구역에서 환경조절 비용이 적게 드는 시설원예단지 적지선정에 앞서 기상환경을 분석하고 평가기준을 정립하였다. 연구대상지는 28,300ha에 조성계획 중인 새만금 지역을 중심으로 하였다. 12곳의 기상 자료를 평가등급 및 주제도 작성에 활용하였다. 전문가 설문조사를 통해 10개 주제를 선정하였다. 10개 주제는 여름철 20일간 최고온도 평균, 겨울철 20일간 최저온도 평균, 여름철 90일간 평균온도, 겨울철 90일간 평균온도, 연중 순간 최고풍속과 연중 평균풍속, 겨울철 일간 일사량의 평균, 연중 안개 발생일수, 연중 일간 최고 강수량, 봄철 평균습도 분포 등으로 주제를 선정하였다. 선정된 주제에 대한 평가 등급은 연구대상지 기상환경을 분석하여 10 등급화 하여 구분하였으며, 전문가의견을 반영하여 가중치를 설정하였다. This study was conducted to find the suitability site selection for the construction of Saemangeum horticulture complex taking into account cost-effective environmental management by analyzing and comparing meteorological conditions. The study sites were regions around the Saemangeum area in which the development of an industrial complex extending 28,300 ha is planned. We collected meteorological data in 12 candidate sites and established a rating scheme and thematic maps. We selected ten themes by consulting experts using a questionnaire. Selected ten themes is Summer, 20 days max. temp. mean, Winter, 20 days min. temp. mean, Summer, 90 days temp. mean, Winter, 90 days temp. mean, Year-round, max. wind velocity, Year-round, wind velocity mean, Winter, 90 days solar radiation mean, Year-round, number of foggy days, Yearround, 1 day max. rainfall and Spring. 90 days humidity mean. And we set ratio-based weights for the evaluation parameters.

Poster Session : PS 0652 ; Respiratory Medicine ; Bronchobiliary Fistula (BBF) Treated with Lipiodol Embolization

( Min Je Kim ),( Seon Hye Kim ),( In Kyoung Hwang ),( Hyo Seok Lim ),( Yee Hyung Kim ),( Myung Jae Park ),( Jee Hong Yoo ),( Hong Mo Kang ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Introduction: Bronchobiliary fi stula (BBF) usually occurs either in the congenital form or following thoracoabdominal trauma. However, it can also occur as a rare complication of diseases of biliary tract. Herein, we report the case of a 53-year-old man with acquired, non-traumatic BBF, treated with lipiodol embolization. Case: A 53-year-old man visited our hospital with fever, cough, and brownish sputum for 2 months. One year ago, he was diagnosed with hepatocellular carcinoma, and received transarterial chemoembolization (TACE) 5 months ago. After procedure, multiple hepatic abscesses and biloma developed. Multiple abscess drain tube and percutaneous transbiliary gall bladder drain (PTBD) tube were inserted and he was treated with antibiotics for a month. He was readmitted 3 months after his discharge with biloptysis. Laboratory data showed leukocytosis with an elevated C-reactive protein (10 mg/dL). Chest X-ray demonstrated peribronchial infi ltration in the right lower lung fi eld and chest computed tomography (CT) revealed a consolidation in right lower lobe with sub-diaphragmatic abscess. Antibiotics started and drain tube for sub-diaphragmatic abscess was inserted and PTBD tube was changed. However, his symptoms and pneumonic infi ltration on chest x-ray was not improved. We performed a tubogram which showed dilated bile duct and a fi stulous communication with the right bronchial tree. He was diagnosed as BBF and lipiodol embolization was performed successfully. His symptoms and pneumonic infi ltration on chest x-ray was improved, and was discharged on the 18th post-procedure day. Discussion: BBF in adults is a rare condition complicating bile duct obstruction and liver abscesses. Rapid diagnosis and early treatment of septic complications are necessary. Early intervention for embolization should be considered in patients who did not show good response to conservative treatments.