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Sang-Ho Jeon,Sunhwa Park,Da-Hee Song,Jong-yeon Hwang,Moon-su Kim,Hun-Je Jo,Deok-hyun Kim,Gyeong-Mi Lee,Ki-In Kim,Hye-Jin Kim,Tae-Seung Kim,Hyen-Mi Chung,Hyun-Koo Kim 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5
To establish new metal groundwater standard, 5 metals such as aluminum, chromium, iron, manganese, and selenium were evaluated by Chemical Ranking Of groundWater pollutaNts (CROWN) including possibility of exposure, toxicity, interest factor, connection standard for other media, and data reliability. 430 groundwater samples in 2013 and 2014 were collected semiannually from 110 groundwater wells and they were analyzed for selenium, manganese, iron, chromium, and aluminum. For this study, 430 groundwater samples were categorized into 3 geological distribution features, such as igneous, metamorphic, and sedimentary rock region and geological background levels were divided by pre-selection methods. For the results, the average concentrations of aluminum, chromium, iron, manganese, and selenium in 430 groundwater samples were 0.0008 mg L<SUP>-1</SUP>, 0.0001 mg L<SUP>-1</SUP>, 0.174 mg L<SUP>-1</SUP>, 0.083 mg L<SUP>-1</SUP>, and 0.0004 mg L<SUP>-1</SUP><SUP></SUP>, respectively. In addition, among various geologies, average concentration of selenium was the highest in igneous rock region, average concentrations of chromium, manganese and aluminum were the greatest in sedimentary rock region, and average concentration of iron was the most high in metamorphic rock region. As a result of the geological background concentration with pre-selection method, background concentrations of selenium and aluminum in groundwater samples were the highest from sedimentary rock as 0.0010 mg L<SUP>-1</SUP> and 0.0029 mg L<SUP>-1</SUP> and background concentrations of manganese and iron in groundwater samples were the greatest from metamorphic rock as 0.460 mg L<SUP>-1</SUP> and 1.574 mg L<SUP>-1</SUP>, and no chromium background concentration in groundwater samples was found from all geology.
( Sung Bum Cho ),( Jong Sun Rew ),( Sung Young Park ),( Hyeng Chen Park ),( Kyeong Won Yoon ),( Seok Cho ),( Wan Sik Lee ),( Chang Hwan Park ),( Hyen Soo Kim ),( Sung Kyu Choi ) 대한소화기학회 2007 SIDDS Vol.9 No.-
Background Aims: Rectal carcinoid has been increasingly detected due to the recent wide use of colonoscopy for routine health examination. Although endoscopic resection should be considered as the treatment for rectal carcinoid, the scar formation after colonoscopic biopsy can lead to unpredicted difficulty in this procedure. This study evaluates the per-procedure findings and treatment results in an attempt to elucidate the effect of scar formation after colonoscopic biopsy in endoscopic resection for rectal carcinoid. Methods: Twelve cases of rectal careinoid with scar formation were compared with 18 non-scar cases, which were treated using the endoscopic resection from January 2002 to August 2007, in terms of the endoscopic findings, resection methods and treatment results. Results: The differences in the clinical findings and tumor size between the scar group and the non-scar group were nonspecific. The average waiting-time between biopsy and resection was shorter (13±16 vs 42±26 ds; p=0.11) in the scar group. During endoscopic resection, small active ulcer was found in 4 scar cases with lesser than 7 days of waiting-time. The risk of limited elevation after submucosal injection was higher (83% vs 44%, p=0.03) in the scar group. In resection methods, ESD was frequently adopted in the scar group (4 cases vs 1 case). The difference in the result of pathologic complete resection between two group were nonspecific. Four patients in the scar group should be admitted (vs 1 case in the non-scar group). Conclusions: ESD technique should be considered in selected cases, because of the postbiopsic scar can block the submucosal elevation in endoscopic resection for rectal carcinoid.
Application of the Bounday-Element Method to Waveguide Problems
Kim, Che Young,Yu, Sang Dae,Kwon, Wu Hyen 경북대학교 1987 論文集 Vol.43 No.-
임의 단면 도파관 해석을 위한 적분방정식을 제안하였다. 제안된 적분방정식에 경계요소법을 적용하여 여러 종류의 도파관 문제 해석을 포괄적으로 취급할 수 있게 하였다. 특히 결과해의 정확성을 확인하기 위하여 엄밀해가 알려진 원통형 도파관의 차단 파수와 벽면 전류를 계산하므로서 본 방법의 타당성 여부를 논의하였다. 리즈 도파관에 대한 도파관 모드를 산출한 후 이를 다른 방법으로 계산한 결과와 비교 검토하였다.
Generation of Model Diesel Particles by Spark Discharge and Hydrocarbon Condensation
Kim, Hak-Joon,Kim, Jin-Ho,Choi, Young-Joo,Oh, Hyen-Chul,Chu, Jung-Bum,Kim, Sang-Soo The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.11
This study was conducted in order to generate model particles which were similar to particles in diesel emission. Spark discharge was used for carbon agglomerates and hydrocarbon condensation for particles that consist of carbon agglomerates and hydrocarbon. The size of the carbon agglomerates, whose mean size were 30 and 70 nm, ranged between 15 and 200 nm, and the total number concentration of the particles ranged from 3 to $5{\times}10^7#/cm^3$ as the controllable variables in spark discharge generator changed. The result of the hydrocarbon condensation experiment showed that the final sizes of the particles enlarged by condensation did not depend on the initial sizes, but the maximum condensational growth of carbon agglomerates by dodecane ($C_{12}H_{26}$) condensation was 112 times the initial size of 40 nm, while the size of the agglomerates by benzene ($C_6H_6$) was 3.25 times its initial size.
Hyen Chung Chun,Ki Yuol Jung,Young Dae Choi,Sanghun Lee,Sung-Up Kim,Eunyoung Oh 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5
Accurate and optimal water supply to cereal crop is critical in growing stalks and producing maximum yields. Recently, upland crops are cultivated in paddy field soils to reduce overproduced rice in Korea. In order to increase productivity of cereal crops in paddy fields which have poor percolation and drainage properties, it is necessary to fully understand crop response to excessive soil water condition and management of soil drainage system in paddy field. The objectives of this study were to investigate effects of excessive soil water to sesame growth and to quantify stress response using groundwater levels. Two cultivars of sesame were selected to investigate; Gunbak and Areum. These sesames were planted in paddy fields located in Miryang, Gyeongnam with different soil drainage levels and drainage systems. The experiment site was divided into two plots by drainage class; very poorly and somewhat poorly drained. Two different drainage systems were applied to alleviate excessive soil water in each plot: open ditch and pipe drainage system. Soil water contents and groundwater levels were measured every hour during growing season. Pipe drainage system was significantly effective to alleviate wet injury for sesame in paddy fields. Pipe drainage system decreased average soil moisture content and groundwater level during sesame cultivation. This resulted in greater yield and lignan contetns in sesame seeds than ones from open ditch system. Comparison between two cultivars, Gunbak had greater decrease in growth and yield by excessive soil water and high groundwater level than Areum. Seed components (lignan) showed decrease in seeds as soil water increased. When soil moisture content was greater than 40%, lignan content tended to decrease than ones from less soil moisture content. Based on these results, pipe drainage system would be more effective to reduce wet injury to sesame and increase lignan component in paddy field cultivation.