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이상국,정재학,이호열,이종설,Yi. Sang-Kuk,Chung. Jae-Hak,Lee. Ho-Yul,Lee. Jong-Seol 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
Recently according to increasing of damage in creeks, it has been needed to develop a close-to-nature creek improvement technique considering flood safety as well as the functions of ecosystem and scenery preservation. In this study, the monitoring on creeks in seven provinces was accomplished to develop the technique applicable to domestic creeks between 2002 and 2007. Although the riparian ecosystem was disturbed, after just finishing the improvement on pilot creeks, the result of monitoring showed that restoration rates of creeks were satisfactory by constructing close-to-nature creek revetments. However it is hard to analyze on restoration and permissible tractive force of each revetments constructed in most creeks, because of insufficient monitoring data. Therefore the feasible study on the close-to-nature creek revetments should be performed in the near future through continuous monitoring on creeks. 최근의 집중호우로 소하천의 피해가 빈번해짐에 따라 치수적 안전성을 확보함과 동시에 환경생태기능 및 경관보존 측면을 반영한 하천정비공법 개발이 필요하게 되었다. 본 연구에서는 국내 소하천에 적용가능한 자연형 하천정비공법 개발을 위해 <TEX>$2002\sim2007$</TEX>년에 걸쳐 전국의 7개 시범소하천을 대상으로 모니터링을 실시하였다. 시범소하천에 대한 정비공사 시행 후, 수변생태계에 교란이 발생하였으나 자연형호안공법 적용으로 생태계의 복원 정도 및 속도는 양호한 것으로 조사되었다. 그러나 국내 적용사례가 많은 호안공법에 대한 실측자료가 부족하여, 공법별 하천복원 및 허용소류력 검토가 어려운 실정이다. 따라서 향후 지속적인 모니터링 사업을 통해 보다 효과적인 자연형 호안공법을 제시해야할 것이다.
이종설,정재학,김수전,이호열,Lee. Jong-Seol,Chung. Jae-Hak,Kim. Soo-Jun,Lee. Ho-Yul 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
The purpose of this research is to analyze sensitivities on hydraulic characteristic factors of bridge and culvert causing flood water level rising. With HEC-RAS and RMA2 models, analysis of backwater due to bridge and culvert in an ideal stream was carried out. The results of hydraulic modeling and sensitivity analysis indicated that the opening ratio and the Froude number were the most sensitive factors and other factors were not quite sensitive to flood water level rising.
낙동강 수계 폐수배출업소를 대상으로 휘발성유기화합물질 배출실태 조사
이인정 ( In Jung Lee ),임태효 ( Tae Hyo Lim ),허성남 ( Seong Nam Heo ),이재관 ( Jaeg Wan Lee ),이용희 ( Yong Hee Lee ),이호열 ( Ho Yul Lee ),천세억 ( Se Uk Cheon ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.3
There are many industrial factories in the central Nakdong river basin and have been occurred water pollution accidents by hazardous chemicals such as phenol, 1,4-dioxane and perchlorate. In this study, seven volatile organic compounds, VOCs(1,3-butadiene, vinyl acetate, ethyl acrylate, epichlorohydrin, styrene, hexachloroethane, 1,4-dioxane) potentially discharged into the Nakdong river were determined by purge & trap and gas chromatography-mass spectrometry(GC-MS). Method detection limit(MDL) and limit of quantitation( LOQ) were in the range 0.14~0.38 μg/L and 0.44~1.22 μg/L, respectively. Six compounds(1,3-butadiene, vinyl acetate, ethyl acrylate, epichlorohydrin, styrene, 1,4-dioxane) were detected in wastewater treatment plants(WWTPs) and wastewater discharge facilities from the Nakdong River basin. 1,4-Dioxane was most frequently observed in WWTPs and wastewater discharge facilities.
Java 프로그래밍 언어에 의한 역 T형 옹벽 설계 프로그램 개발
이호열,이기세 大田大學校 産業技術硏究所 2002 산업기술연구소 論文集 Vol.13 No.2
The design of retaining wall can be done by the trial and the error method until the assumed section in the retaining wall design is satisfied with the stability condition and the design condition. A lot of times and efforts are needed in designing because of the nature of the trial and the error method. In this study, the reverse T-type retaining wall design software is programed with the language of Java to reduce the time and effort in designing the reverse T-type retaining wall. The program uses the two types of the lateral earth pressure theory which are the T.W.M (Trial Wedge Method) and the I.T.W.MQmproved Trial Wedge Method). According to the comparison between T.W.M and I.T.W.M in the design, the following results can be drawn. 1. The results of the lateral earth pressure by T.W.M and I.T.W.M are similar. 2. When the heel-length of the retaining wall is very short, the angles of wall friction computed by T.W.M and I.T.W.M show different results. 3. T.W.M computes the lateral earth pressure without considering the lateral earth pressure due to the soil around the heel of the retaining wall. I.T.W.M computes the lateral pressure with considering the lateral earth pressure due to the soil around the heel of the retaining wall. Each method has different computation procedures but the results show similar outputs. Based on. these results, it might say that the soil on the heel has a little effect on the lateral earth pressure.