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양성용(Sung-Yong Yang),조용성(Yongsung Cho),손요환(Yowhan-Son),이우균(Woo-Kyun Lee) 한국에너지기후변화학회 2009 에너지기후변화학회지 Vol.4 No.1
The production and use of renewable biofuels have grown more quickly in recent years as the alternative energy for highly-priced oil and natural gas. While the importance of biofuel development is being emphasized as the solution to the reduction of domestic greenhouse gases and enforcement of energy security, nevertheless, various issues of material balance of biofuel, supply of biodiesel producer, non-aggressive governmental policy and the lack of consumer awareness are delaying the effective and extended supply of biofuel. This study first aims to analyze the biofuel polices and the current situations of domestic, deal with the aspects of supply and demand and last but not least, present the suggestion for improvement.
HPLC를 이용한 Isoproturon, Phenmedipham, Pyridate 및 Nitenpyram 4종 성분의 잔류농약 분석법 개발
양성용(Sung-Yong Yang),구윤창(Yun-Chang Koo),Zeng Wang,허경(Kyeong Heo),김형국(Hyeongkook Kim),안은미(Eun-Mi An),신한승(Han-Seung Shin),이진원(Jin-Won Lee),이광원(Kwang-Won Lee) 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.8
Bis-carbamate계(phenmedipham), urea계(isoproturon), thiocarbamate계(pyridate) 및 vinyllidenediamine계(nitenlyram) 4종의 농약을 HPLC를 이용하여 분석하는 방법을 개발하였다. 사용된 칼럼은 C-18(250 ㎜×4.6 ㎜, 5 ㎛ diameter particle size)이며 isoproturon, phenmedipham은 acetonitrile과 물을 50:50으로 섞어서 사용하였으며, pyridate는 acetonitrile과 물을 85:15로, nitenpyram은 phosphoric acid를 이용하여 pH 2.5로 맞춘 50 mM KH₂PO₄와 acetonitrile을 90:10으로 섞어 유속 1 mL/min의 isocratic 조건으로 분석하였다. 시료 주입량은 10 μL이며 retention time은 isoproturon 6.12분, phenmedipham 8.63분, pyridate 9.40분, nitenpyram 12.76분, 정량한계는 모두 0.05 ㎎/㎏이었다. 회수율 실험은 쌀, 사과 및 대두에 4종의 농약 표준품을 각각 0.05, 0.1 및 0.5 ㎎/㎏이 되도록 세 가지 농도로 spiking 하였으며, 회수율 및 분석오차는 70.18~118.08% 범위와 10% 이내를 만족하였다. A method for the determination of four pesticide compounds, urea (isoproturon), bis-carbamate (phenmedipham), thiocarbamate (pyridate) and vinyllidenediamine (nitenpyram) were examined and analyzed by HPLC with C-18 column (250 ㎜×4.6 ㎜, 5 ㎛ diameter particle size). Mobile phase consisted of deionized water, acetonitrile and 50 mM KH₂PO₄ (pH 2.5). Isoproturon and phenmedipham analytical condition was isocratic elution of the column with 50% solvent A (acetonitrile) and 50% solvent B (deionized water); pyridate was 85% solvent A (acetonitrile) and 15% solvent B (deionized water) at a flow rate of 1 mL/min; and nitenpyram analytical condition was 90% solvent A (50 mM KH₂PO₄, pH 2.5) and 10% solvent B (acetonitrile) at a flow rate of 1 mL/min. In results, retention times were 6.12, 8.63, 9.40 and 12.76 min for isoproturon, phenmedipham, pyridate and nitenpyram, respectively. All injection volumes were 10 μL and the limit of quantitation was 0.05 ㎎/㎏ for four pesticide compounds, respectively. Recovery rate test was performed with three farm products, rice, apple and soybean. Four pesticide compounds were spiked at concentrations of 0.05, 0.1 and 0.5 ㎎/㎏. The recovery rates were ranged from 70.18% to 118.08% and the standard deviations of all experiments were within 10%.
HPLC/DAD를 이용한 림술푸론, 에타메트설푸론메틸, 트리베누론메칠, 클로리무론에칠 4종 성분의 잔류농약 분석법 개발
구윤창(Yun-Chang Koo),양성용(Sung-Yong Yang),왕증(Zeng Wang),안은미(Eun-Mi An),허경(Kyoung Heo),김형국(Hyengkook Kim),신한승(Han-Seung Shin),이진원(Jin-Won Lee),이광원(Kwang-Won Lee) 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.8
Sulfonylurea계 제초제인 rimsulfuron, ethametsulfuronmethyl, tribenuron-methyl, chlorimuron-ethyl의 네 가지물질의 잔류농약 분석을 위해 HPLC를 이용한 분석방법을 개발하였다. ODS 칼럼(250 ㎜×4.6 ㎜, 5 ㎛ diameter particle size)를 사용하였으며 칼럼오븐은 35oC로 유지하고 용매 A(20 mM KH₂PO₄, pH 2.5)와 용매 B(acetonitrile)를 45:55의 비율로 1 mL/min의 유속으로 흘려주었다. 시료 주입량은 20 μL였으며 분석조건 하에서 rimsulfuron, ethametsulfuron-methyl, tribenuron-methyl, chlorimuron-ethyl의 retention time은 각각 5.92, 6.54, 9.28, 14.35분이었고 정량한계는 각각 0.02, 0.01, 0.001, 0.004 ㎎/㎏이었다. 회수율 실험은 백미, 사과, 콩에 4종의 농약 표준품을 각각 0.05, 0.1, 0.5㎎/㎏의 세 가지 농도로 spiking하여 수행하였으며 86.12∼116.26%의 회수율을 얻었고 표준오차는 모든 실험에서 10%이하였다. The method for residue analysis of four sulfonylurea pesticides, rimsulfuron, ethametsulfuron-methyl, tribenuron-methyl and chlorimuron-ethyl was examined and analyzed by HPLC with ODS column (250 ㎜×4.6 ㎜, 5 ㎛ diameter particle size) which was maintained at 35oC. Mobile phase consisted of solvent A (20 mM KH₂PO₄, pH 2.5) and solvent B (acetonitrile). Isocratic elution of the column with 45% solvent A and 55% solvent B at a flow rate of 1 mL/min resulted in retention times of 5.92, 6.54, 9.28, and 14.35 min for rimsulfuron, ethametsulfuron-methyl, tribenuron-methyl, and chlorimuron-ethyl, respectively. All injection volumes were 20 μL. The limit of quantitation was 0.02, 0.01, 0.001, and 0.004 ㎎/㎏ for rimsulfuron, ethametsulfuron-methyl, tribenuron-methyl, and chlorimuron-ethyl, respectively. Recovery rate test was performed with three farm products, rice, apple and soybean. Four sulfonylurea pesticides were spiked at concentrations of 0.05, 0.1 and 0.5 ㎎/㎏. The recovery rates were ranged from 86.12% to 116.26% and the standard deviations of all experiments were within 10%.
서일(Il Seo),양성용(Sung-yong Yang),황종균(Jong-Kyun Hwang) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
자기부상철도 분기기는 일반철도 분기기와는 다르게 굴절식 거더가 일정 각도로 이동하여 열차의 진로를 바꿔주는 분기기 시스템으로 분기기 진로의 설정이나 방향 검지에 오류가 발생할 경우 열차의 탈선뿐만 아니라 추락에 의한 대형사고의 발생 가능성이 크다. 또한 일반철도 분기부에서 발생하는 장애사례를 살펴보면 신호장애가 많은 비중을 차지하고 있으며 분기기 위치 검지에 전기적 센서를 사용하는 자기부상철도 분기기의 경우도 신호 장애로 인한 운행지연 및 사고 발생확률이 높다. 본 논문에서는 일반철도 분기기와 자기부상철도 분기기의 장애발생 사례를 분석하고, 이를 통해 신호장애를 감소시키고 신뢰성 향상을 위한 자기부상철도 분기기의 위치검지 개선 방안을 제시하고자 한다. Maglev articulated girder switch is a turnout system that moves at a constant angle to change the path of the train. If an error is detected on the turnout career change or direction can cause derailment of trains as well as trains crash. The signal failure cases in the traditional wheel-on-rail system occupies a large proportion, in the case of magnetic levitation railway turnont using an electrical sensor also operates a high probability of train delays and accidents due to signal failure. In this paper, analyzing the failure case of the railway and urban maglev switches and then we present the position of the turnout detection methods for improving the reliability of the magnetic levitation railway switch.