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김홍태,신동석,김용석,Kim, Hong Tae,Shin, Dong Seok,Kim, Yong Seok 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
Vulnerable areas by non-point source pollution and prioritizing control areas were researched using hydrological and geomorphological data, non-point source loads, and water quality data. Using overlay analysis, vulnerable areas were graded with various scenarios. Vulnerable areas were selected near the metro city with impermeable landuse because non-point source loads and water quality data had influence on overlay analysis to rank vulnerable area. Analysis scenarios and weighted values can be changed under regional characteristics and given conditions.
김홍태,민경석 ( Hong Tae Kim,Kyung Sok Min ) 한국물환경학회 1993 한국물환경학회지 Vol.9 No.3
This study was carried out to obtain the basic design and operating parameters of Moving Media Complete Mixing Activated Sludge (MMCMAS) system for the wastewater treatment. A laboratory MMCMAS reactor was operated at the hydraulic loading of 17∼340ℓ/㎡/d, and the rpms of the moving media were varied with the operational hydraulic loading. Following conclusions from this study were drawn ; (1) The laboratory MMCMAS reactor demonstrated that SBOD removal efficiencies of more than 90% were achieved at the hydraulic retention time(HRT) of 1.5 hours that was relatively shorter HRT than conventional activated sludge process. The nitrification rates of MMCMAS reactor varied in the range of 6 to 90%, depending on the hydraulic loading rates. (2) The optimum rotational speed of moving media were 5∼15rpm and 25rpm at the hydraulic loading rates of 17∼122ℓ/㎡/d and 169∼340ℓ/㎡/d, respectively. The organic removal efficiencies were little affected by the variation of rpms of the moving media at the lower hydraulic loading rates, whereas the organic removal efficiencies were reduced at higher hydraulic loading rates. It is therefore concluded that the rpm of the moving media would be an important operating parameter at higher organic loading. (3) The attached biomass on the moving media varied in the range of 32 to 94% of total biomass in the system depending on the hydraulic loading rates. The ratio of attached biomass to total biomass was increased with the increment of hydraulic loading rate. In addition, it was noticed that the concentration of suspended biomass in the system was strongly correlated with the rpms of the moving media. The finding indicates that the shear forces due to the rotational speed of moving media govern the suspended biomass concentration in the system. The biofilm thickness on the moving media was increased with the increment of hydraulic loading rates. It was also found that the density of biofilm was consistently 50±10㎎/c㎥ at the various hydraulic loading rates as well as rpms of the moving media.
김홍태,신현석,Kim,Hong-Tae,Shin,Hyun-Suk 한국방재학회 2009 한국방재학회논문집 Vol.9 No.1
본 연구는 비선형 단위도인 지형형태-기후학적 단위도(GCUH)와 하도추적을 포함한 GIS기반 지형수문유역모의 모형 (<TEX>$G^{2}WMS$</TEX>)을 개발하고 실강우사상과 계측 산악유역에 적용함으로써 미계측 산악유역의 적용가능성을 검토하는 것이다. 대상유역을 소유역은 설마천, 중유역은 안동댐 유역으로 선정하여 실측단위도 비교, 실측홍수사상 비교를 단일유역과 분할유역으로 구분하여 검정 및 분석에 이용하였다. 결과적으로, 중유역 안동댐은 비선형 GCUH기법과 하도추적이 적용된 분할유역이 선형 전통적기법만 적용된 단일유역보다 산악유역 강우-유출 특성을 잘 반영함을 확인하였다. In this study, we developed the GIS-based Geomorpho-hydrological Watershed Modeling System(<TEX>$G^{2}WMS$</TEX>) which could consider both nonlilear rainfall-runoff relationship based on Geomorpho-Climatic Unit Hydrograph(GCUH) as well as watershed system inducing river routing. The developed new model was calibrated at the gaged rainfall events at natural watersheds and previewed to apply at the ungaged mountain basins, such as Sulma basin for small mountain basin and Andong-Dam basin for large scale basin, compared single with partitioned basin in the observed unit hydrographs and rainfall-discharge events. Finally, at the large scale Andong dam basin, we concluded that partitioned basin cases which including th nonlinear GCUH and river routing methods were superior to single basins which including the traditional methods in rainfall-discharge simulation at the mountain basins.
인적 요인을 중심으로 한 해양사고 분석 및 예방 연구 (예부선 사고사례를 중심으로)
김홍태,나성,Kim, Hong-Tae,Na, Sung 선박안전기술공단 2009 선박안전 Vol.27 No.-
Despite the development of the various navigational equipment, such as GPS, ARPA, ECDIS, AIS, VDR, and hull monitoring system, marine accidents are still a leading concern in shipping industry. For all accidents over the reporting period, approximately 60 to 80% of the accidents was involved in human error. It means that in each case, some events which were associated with human error initiated an accident, and those failures of human performance led to the failure to avoid an accident or mitigate it's consequences. However, the improvement and the effort on the maritime human error are still limited in an elementary step. The objective of this paper is to propose a modified Human Factors Analysis and Classification System (HFACS) model in order to analyse the collision accidents of tug-barge ship.
폐기왓장과 황산염 환원 미생물을 이용한 산성 광산 폐수 처리
김홍태 ( Hong Tae Kim ),이태룡 ( Tae Ryong Lee ),이영도 ( Young Do Lee ),김광덕 ( Kwang Deok Kim ),조영탁 ( Young Tak Jo ),김영태 ( Young Tae Kim ) 한국수처리학회 2010 한국수처리학회지 Vol.18 No.6
The removal of heavy metals such as Fe, Mn, Zn, Pb, Cu, and Cr from the acid mine drainage (AMD) with wasted tiles and sulfate reducing bacteria (SRB) was investigated. NaHCO3 in phase 1 and the waste tiles in phase 2 were used to adjust pH of AMD to neutral and weak base in the first reactor and to remove some heavy metals, followed by anaerobic reactor containing SRB to additionally remove them. The HRT was 3 days in phase 1 and 2 days in phase 2. The pH adjustment in phase 1 and 2 was compared each other. The pH increased from 3 to 5 in phase 1 and 2, indicating the wasted tiles (phase 2) was as effective in pH increase as NaHCO3 (phase 1). The removal efficiencies of Fe, Mn, Zn, Pb, Cu and Cr in phase 1 were 80, 30, 60, 61, 44 and 40%, respectively, and 90, 40, 70, 80, 62 and 45% in phase 2, respectively, indicating higher removal efficiencies of heavy metals in phase 2 than those in phase 1. In addition, Fe, Mn, Cr and Cu are removed with higher efficiencies in pH 5~7 compared to those in pH 7~8, although some heavy metals were easily to be precipitated at higher pH. It indicates that the heavy metal removal by SRB might be dominant to the removal of the heavy metals at low pH.