Flexural Responses of Prestressed Hybrid Wide Flange Composite Girders

Sun?Jin Han,Deuck Hang Lee,Jae?Yuel Oh,Seung?Ho Choi,Kang Su Kim 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.5

In this study, prestressed hybrid wide flange (PHWF) composite girders were proposed, and full-scale flexural tests were conducted to evaluate their structural performances. This new proposed girder system was developed and designed to effectively resist external loads considering the actual construction sequences. Two specimens with and without shear connectors were fabricated and tested to examine the effect of the shear connectors for achieving the fully-composite behaviors between a cast-in-place (CIP) concrete and the prefabricated prestressed steel–concrete composite girder. The test results showed that sufficient flexural strengths and deformation capacities can be obtained in both types of PHWF composite girders with and without shear connectors. To reflect the actual construction stages of the proposed PHWF composite girder, nonlinear flexural analyses were proposed considering the prestress effect and segmental effect before and after composite with the CIP concrete, respectively. The observed and analysis results of strain behaviors of the PHWF girder specimens were also compared and discussed in detail.

한강둔치에서 재배된 농작물 중의 미중금속 함량에 관한 연구

김연천,전옥경,양혜란,최영희,한선희,이강문,Kim, Youn-Choen,Chun, Ock-Kyoung,Yang, Hae-Ran,Choi, Young-Hee,Han, Sun-Hee,Lee, Kang-Moon 한국식품위생안전성학회 2000 한국식품위생안전성학회지 Vol.15 No.3

한강 고수부지 및 지천인 안양천, 탄천, 중랑천변의 경작지에서 채집된 36종 285건의 농작물에 대한 Pb, Cr, Cd, Fe, Zn, Mn, Cu. Hg의 농도를 측정하고 그 결과를 채집 시기, 채집 지역 및 작물별로 비교, 분석한 결과, 작물 중의 중금속 함량은 평균치를 기준으로 볼 때 Fe(34.592 ppm)>Mn(11.071 ppm)>Zn(8.853 ppm)>Cu(1.795 ppm)>Cr(0.237 ppm)>Pb(0.100 ppm)>Cd(0.011 ppm)>Hg(0.003 ppm) 순으로 곡류 및 두류에서는 Zn의 함량이 Mn보다 높고, 채소류와 과실류에서는 Mn의 함량이 Zn보다 높은 양상을 나타냈다. 또한 각 지역에서 채취한 작물의 미량금속 함량의 경우 Fe은 0.004∼203.083 ppm, Cu은 0.017∼22.727 ppm. Mn은 0.000∼74.373 ppm. Zn은 0.080∼37.166 ppm으로 비교적 고농도로 존재하고 있는 반면 유해중금속류인 Pb은 0.000∼0.654 ppm, Cd은 0.000∼0.270 ppm, Cr은 0.000∼l.229 ppm, Hg은 0.000∼0.037 ppm으로 비교적 미량으로 존재함을 알수 있었다. 대상 농작물을 잎, 줄기, 뿌리, 열매로 분류하여 미량금속 함량을 분석한 결과, 분석 대상 금속의 농도가 잎>줄기>뿌리>열매의 순으로 나타났다. 무등의 뿌리 작물에 있어서 Pb은 잎(0.055 ppm))뿌리(0.035 ppm), Cr은 잎(0.118 ppm))뿌리(0.031 ppm), Cd은 잎(0.004 ppm)1뿌리(0.001 ppm), Hg은 잎(0.004 ppm))뿌리(0.001 ppm)으로 뿌리보다 잎에 많은 것으로 나타났는데 이러한 결과로 보아 뿌리는 금속 이온이 흡수되는 기관일 뿐 축적은 잎에 비해 상대적으로 적게 됨을 알 수 있었다. This study was conducted to determine the content of trace metals in crops cultivated in Han-riverside, Anyang stream, Tan stream, and Jungryang stream. Trace metals (Pb, Cr, Cd, Fe, Zn, Cu, Hg) were detected in 36 crops, 285 samples by Atomic Absorption Spectrophotometer and Mercury Analyzer. The average concentration of trace metals in crop samples was in the order of Fe (34.592 ppm)>Mn (11.071 ppm)$\geq$Zn(8.853 ppm)>Cu(1.795 ppm)>Cr(0.237 ppm)>Pb(0.100 ppm)>Cd(0.011 ppm)>Hg(0.003 ppm). In crop samples, the contents of Fe, Cu, Mn, and Zn, which ranges were 0.004-203.083 ppm, 0.017~22.727 ppm, 0.000~74.373 ppm, 0.080~37.166 ppm, respectively, were relatively higher than those of Pb, Cd, Cr, and Hg, which ranges were 0.000~0.654 ppm, 0.000~0.270 ppm, 0.000~l.229 ppm, 0.000~0.037 ppm, respectively. The concentration of trace metals in crop samples was in the order of leafy vegetables > stem vegetables > root vegetables > fruity vegetables. In the root vegetables, such as radish, the content of Pb was leaf(0.055 ppm)>root(0.035 ppm), that of Cr, leaf (0.118 ppm)>root(0.031 ppm), that of Cd, leaf(0.004 ppm)>root(0.001 ppm), that of Hg, leaf(0.004 ppm)>root(0.001 ppm). As the results, it could be thought that root is the organ which doesn't accumulate the heavy metal ions, but absorb them.

하천 만곡률과 홍수량에 따른 수면경사도 산정

최한규,이문희,백효선 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

In this research, we made a one and two-dimensional analysis of numerical data collected from the bend curvature of a bended river section. According to the result from the numerical analysis, the inflow & output angle caused a water level deviation which increased with an increase of the flood discharge. From the water level deviation of our two- dimensional numerical model, we obtained the maximum slope of 6,67% when the inflow and output angle was 105 degrees and the flood discharge was 500 CMS. As for the right side, the differences with the one-dimensional numerical model were reduced when the angle was more than 90˚. As for the left side the differences were reduced when the angle was more than 105˚. For a river with more than 90 degrees bend curvature, a hydraulic experiment would be more appropriate than a numerical analysis.

昭陽湖 上流流城의 降雨强度에 따른 浮游物質流出持性

최한규,유상모,백효선 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

When it is raining or snowing, floating debris flows into a lake and raises its turbidity. High level of turbidity in the lake often causes eutrophication, which pollutes the water. In order to collect and present some essential information for effective management plan for water quality, we carried out our research at the watershed of Mandae-cheon located at the upstream of Soyang Lake. We examined water quality at the time of rainfall or snowfall to analyze the changes in the amount of suspend soils(SS) in the lake.

자발성 뇌실내출혈 환자에서 임상적 -전산화단층촬영상소견의 상관관계

황선철,김범태,장재칠,주교성,신원한,최순관,변박장 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.6

하천설계기준의 만곡부 수면형 결정 방법에 대한 적용성 검증

최한규,채홍기,백효선 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

Through the result of calculating the deviation between the value calculated from two-dimensional number formula, one-dimensional number interpretation, and curving part water surface type calculation method, we could confirmed that the deviation is reduced more than 50% when we use curving part water surface type calculation method. Also it was confirmed that there occurs the reduction since the reduction rate of safe room height was 20% in 500 CMS of flood water quantity when we planed the construction of levee by curving part water surface type calculation method. And therefore, we have confirmed that the curving water surface type calculation method can be used as a simple formula in rivers with water quantity less than 500 CMS that flows in and out in less than 90 degree angle.

肺吸蟲症 診斷에 있어서 ELISA법의 應用에 관한 硏究

崔銑吉,李駿商,林漢鍾 고려대학교 의과대학 1984 고려대 의대 잡지 Vol.21 No.1

Human paragonimiasis is one of the common trematode diseases and of very important public health problem in Korea. Although many techniques have been deviced for immunological diagnosis of paragonimiasis, they exhibit low sensitivity and specificity. In this study the enzyme-iinked immununosorvent assay (ELISA) was employed in the diagnosis of human paragonimiasis using Paragonimus VBS(veronal buffered saline) antigen, peroxidase conjugated anti-human Ig G and ortho-phenylenediamine as a substrate by micromethod according to technique of Voller et al. (1979) and McLaren et aI. (1978) with minor modifications. Sera tested were categorized into 106 paragonimiasis, 20 clonorchiasis, 12 taeniasis, 10 toxoplasmosis, 10 hymenolepiasis and 10 non-infected human cases. The results obtained are as follows: 1. In the preliminary study optimal dilutions of conjugate, stock antigen and serum were 1/5,000, 1/400 and 1/400 respectively. 2. The O.D. (optical density) values of the ELISA in the sera of paragonimiasis cases using stock antigen and VBS antigen were 1.291±0.731 and 1.466±0.813, respectively, and the mean O.D. values in the sera of paragonimiasis cases using VBS antigen were not significantly different from that of stock antigen in sensitivity. (p<0.001) Results showed a standard sensitivity in the application of the ELISA in the diagnosis of human paragonimiasis using VBS antigen. 3. The mean O.D. values of the ELISA in 106 sera of paragonimiasis cases were 1.243±0.863 and those of other parasite infection groups and non-infected human group were 0.487±0.549 in clonorchiasis, 0.513±0.521 in taeniasis, 0.158±0.235 in hymenolepiasis, 0.222±0.235 in non-infected human group and that in paragonimiasis was significantly higher than those of other groups. 4. Distribution of the O.D. values of the ELISA, 86 (81.1%) out of 106 paragonimiasis sera, 3 out of 52 other parasite infection group sera and none out of 10 non-infected human group showed highter than that of the positive serum of 1.000 at 488nm) O.D. value. In conclusion, results of this study suggest that the ELISA is more applicable and reproducible in the diagnosis of human paragonimiasis than other immunological tests used especially in seroepidemiological study.

다량의 하부위장관출혈이 병발된 Vibrio vulnificus 패혈증 1예

최주연,유진홍,한석원,이대훈,최민호,박순민,김연식,김선우,신완식,강문원,강성구 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.2

최근 저자들은 Vibrio vulnificus 감염에 의해 패혈증 및 이차성 피부 병변을 보인 42세의 남자 환자의 치료중 하부 위장관 출혈이 병발된 1예를 경험하였기에 보고하는 바이다. We experienced a case of Vibrop vulnificus septicemia which showed an unusual manifestation such as hematochezia. The patient was a 42-year-old man with chronic liver disease. The blood and wound culture revealed the organism. During intensive care, he suffered from massive hematochezi for several days. Colonoscopy and abdominal CT showed findings suspicious of ischemic colitis. To our knowledge, this is the first unusual case of V.vulnificus infection which showed massive lower gastrointestinal bleeding.

풍암 서술시의 이해론적 전제와 미학

최한선 한국고시가문학회 2003 한국시가문화연구 Vol.0 No.11

This study focuses on Poong Am's(1534-1600) poetical prose 28 pieces. To begin with, I regard poetical prose as a narrative poetry, and analyze it's meaning and character by own conception. This attempt is the first one in the study of Korean Literature. I hope that this effort will contribute to study of the voluminous poetical prose properties in korea-chinese literary history. Poong Am was a human nature scholar and volunteer's general who was willing to sacrifice his own self. Poong Am's poetical proses divide into three parts: 1. 爲己之學的存養省察 world 2. 德不孤必有隣的指向 world 3. 持禮敬的自疆不息之姿勢inclination, etc. Especially Poong Am, by his poetical prose, played the pivot roles on the Ho-Nam's poetical circles in the Yi-Dynasty and so we should consider him as the first poet in the philosophical poetry.

분수로 분류부 형상에 따른 유량분배율 특성의 실험적 연구

최한규,백효선,이석환 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

The divided channel is not often used on the river and when the installation is for the controlling of the flow quantity. The determination of the channel size is not a easy task. Model tests are examined to confirm the variation of distribution rate by the method of the channel installation and the position of the structure and the adjustment of numerical simulation is executed by the comparing of the results. This study is to execute numerical model according to installation of divided channel by using AQUADYN program, the 2nd dimension numerical model, and HEC-RAS program, the 1st dimension numerical model, by the shape of divided channel. Also, it compares with difference by method about each case.