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중금속 오염 논토양에서 비산재와 제올라이트 처리에 따른 벼의 생육
이동석 ( Dong-suk Lee ),문주안 ( Ju-an Moon ),이광승 ( Gwang-seong Lee ),이선일 ( Sun-il Lee ),임상선 ( Sang-sun Lim ),곽진협 ( Jin-hyeob Kwak ),최우정 ( Woo-jung Choi ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-
To investigate the potential use of fly-ash (FA) and zeolite (Z) as stabilizers that reduce phyto-availability of heavy metals (HM) in paddy rice, a pot experiment was conducted. Soil was artificially contaminated with Cu (125 mg kg<sup>-1</sup>), Cr (10 mg kg<sup>-1</sup>), Zn (700 mg kg<sup>-1</sup>) and placed into a pot. The heavy metal contamination corresponds to the Korean Soil Contamination Countermeasure Standard. Ten treatments were laid out in triplicates with HM as main treatment and FA and Z application as sub-treatment (0, 5, 10%). Three rice (Oryza sativa L.) was transplanted into the pot and cultivated under rain-shield conditions. Rice was sampled on August 3 at the active growing season and dry weight (DW) was determined. The rice DW was 14.6 g pot<sup>-1</sup> for HM-untreated soil but it decreased to 8.4 g pot<sup>-1</sup> by HM contamination. In HM treated soil, application of FA at 5% increased DW to 9.7 g pot<sup>-1</sup>; however, FA application at 10% and Z application at both 5 and 10% reduced DW of rice. Such pattern of FA and Z application was also observed in HM-untreated soil. Because it was evidenced that both FA and Z had a great capacity to adsorb not only HM but also nutrients (N and P) from a batch-experiment, such negative effect of FA and Z on rice growth was attributed to decreased availability of these nutrients in the soils.
4호선 VVVF 전동차 견인 및 제동시 충격발생에 관한 연구
이성권(Lee Seong Gwon),이규관(Lee Gyu-Gwan),임상문(Lim Sang-Moon),이대원(Lee Dae-won) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
4호선 VVVF 전동차가 교류구간(AC) 운행 중 견인 및 제동 시에 충격이 일부 차량 및 차호에 한정되지 않고 불규칙하게 발생되고 있다. 이 현상 결과가 열차종합정보장치(TGIS)에 고장정보가 현시되지 않아서 차량 검수 시 원인 소멸로 인해 차량의 유지보수 업무에 많은 어려움이 있다. 이에 대한 원인을 분석 규명하고자 운행 중 전차선 전압과 차량의 주회로 측정, 전자제어장치(EC)내 카드 회로의 특성 및 입출력 전압 특성과 각 장치 간 인터페이스 부문을 측정하였다. 그 원인이 상기와 같은 다각적 방면으로 면밀히 분석한 결과 전차선 전압이 공칭전압보다 높게 인식되어 나타나는 것으로 나타났다. 이와 관련된 시스템의 기술적 분석과 전차선 전압 특성 등을 고려하여 문제점을 해결하고자 한다. The impact on VVVF Rolling Stock of Line 4 has randomly been occurring when it is traveling (motoring and braking) is applied regardless of vehicle's kind, but this impact log data is not shown on TGIS(Train General Information System), so it is very difficult to identify the cause of this phenomenon for maintenance. In order to analyze and identify the cause of this irregular impact on vehicle, various conditions were investigated such as the voltage of power line and main circuit in vehicle, the characteristics of cards inside the EC(Electric Control), the voltage characteristics of input/output, and the interface between various devices. As the cause has been analyzed in varieties of angles as above and after the elaborate review, the problem is on the incorrect voltage identification in vehicle which the voltage of power line identifies higher than the nominal voltage. Therefore, the problem will be solved through the given combination of the technical analysis and the characteristics of power line.