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이동식 크레인 하중이 굴착사면 안정성에 미치는 영향 분석
김정곤,나예지,원정훈,Kim, Jeong Kon,Na, Ye Ji,Won, Jeong-Hun 한국안전학회 2021 한국안전학회지 Vol.36 No.5
The effect of heavy construction equipment on the excavated slope is investigated by slope stability analysis. A mobile crane with 500 kN capacity is applied as a working load to the background surface of the excavated slope, in both sandy soil and clay, designed to guarantee the safety of slope stability. Major parameters such as the distance between the edge of the slope and the mobile crane, groundwater level, and ground plate size of the mobile crane are considered. Only 23.8% and 14.3% of the analysis models with sandy soil and clay excavated slope, respectively, satisfied the slope stability. By changing the slope of the sandy soil from 1:1.0 to 1:1.2, the number of analysis models securing slope stability increased from 23.8% to 40.5%. For the clay excavated slope, the analysis models securing slope stability increased from 14.3% to 42.9% by changing slope inclination from 1:0.8 to 1:1.2. In addition, it is found that the increase in the size of the ground plate of the mobile crane increases the analysis models that secure slope stability. Therefore, it is an effective way to relax the excavated slope's inclination angle and simultaneously increase the ground plate size to guarantee stability.
SWAT 모델을 이용한 임하·안동 유역의 부유사량 발생량 추정
김정곤(Jeong Kon Kim),손경호(Kyong Ho Son),노준우(Joon Woo Noh),이상욱(Sang Uk Lee) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.12
본 연구에서는 고탁수 문제가 자주 발생하는 임하·안동 유역을 대상으로 효율적인 탁수 관리를 위한 유출현황 및 토사 유실평가를 목적으로 SWAT 모델을 구축하였다. 홍수기에 측정된 유량과 부유사 농도를 이용하여 모형의 검·보정을 실시하였다. 검·보정된 SWAT 모형을 이용하여 소유역별 연간 부유사 부하량에 대한 공간 분석결과, 전체 유역 대상으로 2005년에 최저 0.7~5.9 tons/ha에서 태풍 매미에 의해 심한 영향을 받은 2003년에 최고 3.0~34.0 tons/ha의 부하량을 보였다. 향후 유역전체의 효율적인 유사량 추정 및 저감대책마련을 위해서는 장기간에 걸쳐 보다 정확하고 광범위한 모니터링과 이를 활용한 모델의 정도 향상이 수반되어야 할 것이다. For efficient turbid water management a SWAT model was established for the Imha-Andong watershed where serious turbid water problems have frequently occurred. To evaluate soil loss combined with rainfall runoff process, the analysis focused on comparing the daily runoff discharge and concentration of suspended sediment (SS) using measured data sets. The results of annual SS load analysis for each sub-basin using the calibrated model showed that in the entire target watershed the soil loss ranged from 0.7 to 5.9 tons/ha in year 2005 and from 3.0 to 34.0 tons/ha in year 2003 when the typhoon `Maemi` severly affected the area. In the future, it is suggest to increase model simulation accuracies supported by a long-term and extensive monitoring to enhance basin-wide suspended sediment estimation and management.
Evaluation of Resistance in Hot Pepper Germplasm to Phytophthora Blight on Biological Assay
Jeong-Soon Kim(김정순),Won-Il Kim(김원일),Hyeong-Jin Jee(지형진),Jae-Gyun Gwang(곽재균),Chung-Kon Kim(김정곤),Chang-Ki Shim(심창기) 한국원예학회 2010 원예과학기술지 Vol.28 No.5
Phytophthora blight of pepper is the most economically important disease in the world cultivation regions. We investigated the phytophthora blight resistance of 300 accessions of Korean landrace of hot pepper germplasms collected from 83 local regions. The disease incidence rate was checked from 7 days to 28 days at an interval of 7 days after inoculation under greenhouse conditions. Among 300 accessions, the disease incidence rate of phytophthora blight of 67 accessions of pepper germplasm was more than 60.1%, while no disease was observed in 37 accessions at 7 days after inoculation. At 28 days after inoculation, five and eleven accessions of pepper germplasm were resistance and moderate resistance to P. capsici, respectively. Two hundred forty four susceptible accessions (81.3%) of pepper were scored as having more than 60.1% of disease incidence of phytophthora blight. This result suggests that five candidate pepper germplasm might be used as breeding resources for the phytophthora blight resistance breeding program. Also, further genetic studies should be carried out to verify this result, with the overall focus of providing information on important characteristics of pepper germplasm.
Astaxanthin처리 산란계로부터 생산된 난황이 Mouse의 마크로파지 활성과 응집소가 및 용혈소가에 미치는 영향
김홍출(Hong-Chul Kim),박숙자(Sook-Jahr Park),김정곤(Jeong-Kon Kim),김영림(Young-Rim Kim),박원석(Won-Seck Park),조용운(Yong-Un Cho),조현종(Hyeon-Jong Cho),김정환(Jeong-Hwan Kim),하영래(Yeong-Lae Ha) 한국식품영양과학회 2001 한국식품영양과학회지 Vol.30 No.6
마크로파지의 활성을 조사하기 위해 carbon clearance time을 조사한 결과 AEY 처리구가 control이나 CEY 처리구에 비해 짧았다. 특히 AEY 500 μg 처리에서 carbon clearance 시간이 5분으로 control에서 9.42분, CEY(250 μg 처리)에서 9.01분보다 유의성있는 감소를 보였다. AEY 처리에 의해 응집소가와 용혈소가가 다소 증가되었다. SRBC 처리 1일째와 3일째에 250 μg 처리구를 비교해 보면, control, CEY, AEY의 응집소가는 각각 5.50, 5.63, 6.00 및 5.25, 5.38, 5.50로 용혈소가는 각각 4.75, 5.38, 5.50 및 4.25, 5.63, 5.63으로 AEY 처리구가 control, CEY 처리구에 비해 면역 활성이 있었지만 유의성은 없었다. Effect of the egg yolks from laying hens intubated, p.o., astaxanthin (designated AEY) on mouse humoral immunity was investigated using male ICR mouse (6~7 weeks of age). Mice were adapted in a temperature- and humidity-controlled house for one week and randomly divided into 5 treatment groups (9 mice/cage/treatment). Mice were intubated p.o., AEY (100, 250 and 500 μg) or control egg yolks (CEY, 250 μg), dissolved in 0.1 mL DMSO, for consecutive 4 days. At day 5, carbon suspension (pilot drawing ink 3 mL+3% gelatine 3 mL) was injected 3 μL per 1 g body weight through tail vein. Carbon clearance time was measured at 5 and 35 minutes post the injection of carbon suspension. Another two experiments were conducted to determine the hemagglutinin-titer (HGT) and hemolysin-titer (HLT) with male ICR mouse (8 mice/cage/treatment). Mice treated with AEY were induced immune activity with SRBC. HGT and HLT were measured from the blood at day 1 and 3 after treatment of SRBC. AEY treatment reduced the carbon clearance time. Especially the carbon clearance time by 500 μg AEY treatment was 5.00 minutes, which was very short time compared with 9.42 minutes by control and 9.01 minutes by CEY. AEY group showed slightly higher values of HGT and HLT than CEY group and control. At day 1, HGT in control, 250 μg CEY and 250 μg AEY groups was 5.50, 5.63, and 6.00, respectively. Similarly, HLT in control, 250 μg CEY and 250 μg AEY groups was 4.75, 5.38, and 5.50, respectively, at day 1. These results suggest that AEY exhibited immunity-enhancing effect.
토양/대수층 처리(Soil Aquifer Treatment)에서 유기물과 질소화합물 제거와 이송 모델링-(II) 현장조건의 변화에 따른 모델 결과
김정우,김정곤,이영준,최희철,Kim Jung-Woo,Kim Jeong-Kon,Lee Young-Joon,Choi Hee-Chul 한국지하수토양환경학회 2005 지하수토양환경 Vol.10 No.4
For the SAT modeling system considering the reaction module which consists of nitrification, denitrification and organic oxidation, an imaginary cross-sectional 2-dimensional model simulation was carried out to analyze the sensitivity of the model. Four parameters, such as hydraulic conductivity, source water loading rate, ground surface pavement and operation schedule, were considered for the sensitivity analysis. Most factors considered in model development step were well reflected in the simulation results. 암모늄의 질산화 반응, 질소산화물의 탈질 반응, 그리고 유기물의 산화반응을 고려한 SAT 모델링 시스템에 대해서, 현장조건의 변화에 따른 모델 결과를 비교하기 위해 6가지 모델 조건에 대한 가상의 수직 2차원상 모델 시뮬레이션을 하였다. 시뮬레이션 조건에서 수리전도도, 주입수 주입율, 지표 피복 여부, 그리고 운영 계획과 같은 4가지 영향 인자들이 고려되었다. 시뮬레이션 결과, 모든 조건에서 모델 개발 과정에서 고려한 반응 영향들이 잘 모사되었다.
토양/대수층 처리(soil aquifer treatment)에서 유기물과 질소화합물 제거와 이송 모델링-(I) 모델 개발 및 검증
김정우,김정곤,차우석,최희철,Kim Jung-Woo,Kim Jeong-Kon,Cha Woo-Suk,Choi Hee-Chul 한국지하수토양환경학회 2005 지하수토양환경 Vol.10 No.3
토양/대수층 처리(Soil Aquifer Treatment, SAT)는 하수처리장으로부터의 2차 또는 3차 처리수를 대수층으로 침투시켜, 토양 매질에서 일어나는 물리적/생화학적 반응에 의해 재처리하는 용수 재이용 기술이다. SAT에서의 주요 관심 대상은 유기물과 질소화합물의 제거와 이송에 있다. 본 연구에서는 암모늄의 질산화 반응, 질소산회물의 탈질 반응, 그리고 유기물의 산화반응을 고려하여 SAT에서 일어나는 반응 메커니즘을 규명하고 이를 지하수 흐름과 이송 모렐 에 접목시킴으로써 SAT 모델링 시스템을 구현하고자 하였다. 실험실 일차원 불포화 토양 컬럼 실험을 통한 모델 검증에서 암모늄, 질산성 질소, DOC, 용존산소 모두 일정한 농도 범위 안에서 일치하였다. 모델 변수에 대한 민감도 분석에서, 암모늄 분배계수는 유출부의 암모늄 농도에, 용존산소 저해상수는 유출부의 유기물 농도에, 그리고 미생물 감쇄계수는 유출부의 용존산소 농도에 영향을 주었다. Soil aquifer treatment is a water reuse technology that secondary or tertiary treated wastewater is infiltrated into the aquifer in which physical and biochemical reactions occur. Major consideration in SAT is the removal and transport of DOC and nitrogen species. In this study, reaction mechanism in SAT was examined considering nitrification, denitrification and organic oxidation. In addition, SAT modeling system was developed as the reaction mechanism was applied to groundwater flow and transport model. In verification of the reaction module by 1-dimensional unsaturated soil column test, the experimental data of all of the species, ammonium, nitrate, DOC and DO, were well matched with the simulation results. In sensitivity analysis, ammonium partition coefficient, dissolved oxygen inhibition constant and biomass decay rate affect ammonium, DOC and DO concentration of effluent, respectively.