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An Analysis of Streambed Changes Downstream of Daecheong Dam
Seo, Hyeong-Deok,Jeong, Sang-Man,Kim, Lee-Hyung,Choi, Kyu-Ho Korean Society of Hazard Mitigation 2008 한국방재학회논문집 Vol.8 No.1
Riverbed change is greatly influenced by artificial factors such as dam construction, gravel collection, and river improvement. This study simulated a long-term bed change based on the GSTARS3 model using actual data from the area downstream of the Geum River Daecheong Dam and compared the estimation with a section of the actual measurement. As a result, it was found that the section of the actual measurement was far lower than the result of the simulation in terms of long-term bed change. While the area downstream of Daecheong Dam displayed approximately an average of 2.29 m of streambed degradation on average while the upper stream area showed approximately 0.63 m of bed degradation over 24 years. In the simulation of the area downstream of Daecheong Dam based on the GSTARS3 model, similar bed degradation was observed. However, a great difference was detected between the result and the actual measurement. According to the cause analysis, the riverbed in the area downstream of Daecheong Dam has continuously degraded due to the dam construction and mass collection of gravel. The mass collection of gravel was the main cause of riverbed change. It was found that about 76% of all riverbed degradation was caused by the mass collection of gravel.
( Hyeong Rae Kim ),( Myung Im ),( Young Lee ),( Chang Deok Kim ),( Jeung Hoon Lee ),( Young Joon Seo ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Red light and blue light have been used for the treatment of acne vulgaris alone or with photosensitizer. The effect of both light alone or combination has been evaluated, but there is no comparison study of red and blue light alone, so far. Objectives: To assess the efficacy of red and blue light phototherapy alone in acne vulgaris, respectively. Methods: Twenty patients with mild to moderated facial acne were treated with red light on the one side and blue light on the other side. The treatment was performed twice a week for 4weeks. Clinical photographs, lesion count were used to assess each side of the face at baseline, 2 and 4 weeks after initial treatment. Results: After 4 weeks treatment of phototherapy, clinical improvement was observed in both inflammatory and non-inflammatory acne lesions compared with baseline. No significant difference was found in between red and blue light. Conclusion: Phototherapy with red or blue light alone appeared to be effective for the treatment of acne vulgaris and there was no significant differences in the efficacy and between both sources.
Sphingosylphosphorylcholine induces proinflammatory signaling via activation of mast cells in skin
( Hyeong Rae Kim ),( Dae Kyoung Choi ),( Kyung Cheol Sohn ),( Myung Im ),( Young Lee ),( Chang Deok Kim ),( Jeung Hoon Lee ),( Young Joon Seo ),( Ji Hye Park ),( Chong Won Choi ),( Ga Young Lee ),( So 대한피부과학회 2012 대한피부과학회 학술발표대회집 Vol.64 No.3
심장 CT에서 자동노출조절 방식과 수동노출 방식의 방사선피폭선량의 감소
김형진(Hyeong Jin Kim),서재현(Jae Hyeon Seo),김영덕(Yeong Deok Kim),정창기(Chang Gi Jeong),이종호(Jong Ho Lee),김영근(Yeong Keun Kim) 대한CT영상기술학회 2013 대한CT영상기술학회지 Vol.15 No.1
목적 심장 CT 검사 시 체질량 지수(Body Mass Index, 이하 BMI)에 따른 ATVS(automatic tube voltage selection)와 ATCM(automatic tube current modulation)를 적용하여 기존에 체질량지수에 따라 관전압과 관전류를 조절하는 수동노출 방식과 비교하여 환자의 피폭을 줄이는 방법을 알아보고자 한다. 대상 및 방법 심박동수가 분당 60회 이하인 환자를 대상으로 전향적 심전도 동기화 방식인 Flash Mode를 이용하여 검사를 시행하였다. 그룹 1(n=49)에서는 체질량 지수 25 kg/m² 미만은 100 kVp, 240 mAs, 체질량 지수 25 kg/m² 이상 30 kg/m² 미만은 120 kVp, 240 mAs의 조건을 주어 검사를 시행하고, 그룹 2(n=31)는 자동노출조절 소프트웨어인 ATVS와 ATCM을 이용하여 영상을 획득하였고 검사장비는 Siemens 사의 Dual Source SOMATOM Definition Flash였다. 영상의 분석은 대동맥 근위부, 좌주관상동맥과 피하지방에 CT음영(density) 정도와 잡음을 측정하여 신호대 잡음비와 대조도 대 잡음비를 알아보았고, 방사선량(CTDI, DLP)을 이용하여 피폭선량을 측정하고 두 그룹 간의 차이를 비교하였다. 또한 2명의 영상의학과 전문의가 전체적인 영상의 질을 4점 척도(very good, good, fair, poor)로 평가하였다. 결과 ATVS와 ATCM를 사용하였을 때 수동노출 방식에 비해 체질량 지수 25 kg/m² 미만에서는 피폭선량은 37.5%가 유의하게 감소되었으나 신호 대 잡음 비, 대조도 대 잡음 비, 영상 잡음 그리고 전체적인 영상의 질에서는 차이를 보이지 않았다. 반면 25 kg/m² 이상 30 kg/m² 미만에서는 피폭선량이 16.7%가 감소하였지만 영상 잡음은 27.4%로 증가하였다. 그러나 영상 잡음의 증가에도 불구하고 신호 대 잡음 비, 대조도 대 잡음 비 그리고 전체적인 영상의 질에서는 차이가 없었다. 결론 자동노출조절 방식은 약간의 영상 잡음의 증가는 있었으나 수동노출 방식에 비해 영상의 질은 변하지 않으면서도 피폭선량을 줄일 수 있는 유용한 방법으로 나타났다. 따라서 자동노출조절 방식은 보다 낮은 선량으로 적절한 영상의 질을 유지시킬 수 있어 앞으로 널리 이용될 수 있는 검사법이라 사료된다. Ⅰ. Purpose To investigate Reduction of Radiation Dose comparing manual with automatic control according to Body Mass Index (BMI) in Cardiac CT. Ⅱ. Materials and Methods This study was performed by using a prospective electrocardiography-gating technique (Flash Mode) in patients with heart rate 60 beats per minute or under. Group 1(n=49) was examined BMI < 25 kg/m² with 100 kVp, 240 mAs, 25 kg/m² ≦BMI < 30 kg/m² with 120 kVp, 240 mAs. Group 2(n=31) was acquired images using Automatic Exposure control[ATVS(automatic tube voltage selection), ATCM(automatic tube current modulation)] at the same time. Equipment was Siemens Dual Source SOMATOM Definition Flash. Image analysis was performed by Quantitative (signal-to-noise ratio; SNR, contrast- to-noise ratio; CNR, image noise) analysis measuring CT density and noise of the proximal aorta, left main coronary artery and subcutaneous fat, by evaluating radiation dose (CTDI, DLP), by Qualitative analysis evaluating by two specialist, Department of Radiology. Qualitative analysis of the overall image quality was evaluated with a four-point scale (very good, good, fair, poor). Ⅲ. Result Effective dose was significantly decreased 37.5% when using the ATVS and ATCM at the same time, but there was no difference of SNR, CNR, image noise, and overall image quality in BMI < 25 kg/m². moreover there was no difference of SNR, CNR, and overall image quality, but effective dose and image noise were significantly decreased 16.7% when using the ATVS and ATCM at the same time in 25 kg/m² ≦BMI < 30 kg/m². Ⅳ. Conclusion The ATVS and ATCM lead to a significant reduction of radiation exposure without degradation of image quality although increasing image noise, therefore, the ATVS and ATCM can be widely used to maintain the proper image quality with low-dose in the future.
경남 북부지역 오리 분변에서 분리된 Campylobacter spp.의 항생제 내성
김형수 ( Hyeong-su Kim ),서덕진 ( Deok-jin Seo ),성민호 ( Min-ho Seong ),한권식 ( Kwon-seek Han ),박정용 ( Jung-yong Park ),정명호 ( Myeong-ho Jeong ),박동엽 ( Dong-yeop Park ),박동주 ( Dong-ju Park ),고필옥 ( Phil-ok Koh ) 한국동물위생학회 2017 한국동물위생학회지 (KOJVS) Vol.40 No.2
The purpose of this study was to investigate prevalence and antimicrobial resistance patterns of Campylobacter spp. from duck feces in northern area of the Gyeongnam province, Korea. Samples of 121 duck feces were taken from April to December 2014 for this survey. Samples were examined by bacteria isolation and reverse transcriptase-polymerase chain reaction assay for detection of Campylobacter spp. Campylobacter were isolated in 37 samples (30.6%). Among these samples, C. jejuni and C. coli were isolated in 35 samples and 2 samples, respectively. Minimum inhibitory concentration (MIC) test is performed to investigate antimicrobial resistance patterns of Campylobacter spp. C. jejuni were resistant to ciprofloxacin (85.7%), nalidixic acid(82.9%), tetracycline (77.1%), gentamicin (57.1%), azithromycin (40.0%), clindamycin (34.3%), erythromycin (22.9%), and florfenicol (8.6%). These data support a database of pollution and antimicrobial resistance of Campylobacter spp. from duck feces and provide a basic information of reducing the secondary damage of antibiotic misuse.
서형덕,정상만,한규하,신광섭,Seo. Hyeong-Deok,Jeong. Sang-Man,Han. Kyu-Ha,Shin. Kwang-Seob 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
기후변화와 지구온난화현상은 지구 전체에 걸쳐 분명하게 나타나고 있으며 그에 따라 발생할 수 있는 수문 변화에 대한 연구가 다양하게 이루어지고 있다. 본 연구에서는 기후변화에 따른 수문 변동 분석을 위하여 SWAT 모형을 이용하였으며 금강 상류유역에 적용하였다. 모형의 보정은 1982-1995년의 월평균 하천유량을 이용하였고 1996-2005년의 자료를 이용하여 검증하였다. 기후변화에 따른 수문 변동을 정량적으로 분석하기 위하여 1988-2002년을 기준시나리오 기간으로 설정하였으며 이산화탄소 농도, 기온, 강수의 변화에 따른 총 6개의 시나리오를 구성하였다. 시나리오 <TEX>$1\sim6$</TEX>은 수문 변화의 민감도를 나타내는 시나리오로 배증 이산화탄소를 반영하는 시나리오는 평균 11%의 하천유량 증가를 예측하였고, -42, -17, 17, 42%의 강수량 변화에 따라서는 -55, -24, 26, 65%의 하천유량 증감이 예측되었다. The SWAT model was used to assess the impacts of potential future climate change on the hydrology of the Upper Geum River Basin(UGRB). Calibration and validation of SWAT were performed on a monthly basis for 1982-1995 and 1996-2005, respectively. The impact of ten 15-year(1988-2002) scenarios were then analyzed relative to a scenario baseline. Among them, scenario 1-6 were set to show the sensitivity response. A doubling of atmospheric CO2 concentration was predicted to result in an maximum monthly flow increase of 11 percent. Non-linear impacts were predicted among precipitation change scenarios of -42, -17, 17, and 42 percent, which resulted in average annual flow changes in UGRB of -55, -24, 26, and 65 percent.