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전자빔 기술을 이용한 반도체 공정의 삼불화질소(NF₃) 분해
류재용(Jae Yong Ryu),최창용(Chang Yong Choi),김종범(Jong Bum Kim),이상준(Sang Jun Lee),김승곤(Seung Gon Kim),곽희성(Hee Sung Kwak),윤영민(Young Min Yun) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.6
전자빔을 이용하여 반도체 공정에서 배출되는 NF3 가스 분해 연구를 수행하였다. 본 연구에서 흡수선량은 0에서 400kGy 범위였고, 전류강도는 0~20mA범위였다. 또한, 처리 대상 가스의 농도 범위는 500~2,000ppm이었다. 그리고 조사시간의 영향을 알기 위해서, 조사시간을 각각 5초, 10초, 15초, 20초 등으로 달리 하면서 실험을 수행하였다. 흡수선량 및 전류 강도가 증가할수록 가스의 분해효율은 증가하였다. 하지만 처리 대상가스의 농도가 증가할 때는 분해효율이 감소함을 알 수 있었다. 흡수선량이 약 400kGy일 때 처리가스의 분해효율은 약 90% 정도를 나타내었다. The destruction study of NF3 gas emitted from the semiconductor industry is performed with electron-beam technology. Absorbed dose (kGy) and current ranged from 0 (0) to 400kGy (20mA). The concentration of NF3 gas ranged from 500 to 2,000ppm. In order to assess the effect of a residence time on DRE (Destruction and Removal Efficiency, %), experiments also conducted at different irridiation times of 5 sec, 10 sec, 15 sec and 20 sec respectively. As absorbed dose and current increased, DRE of NF3 was also increased. However, DRE (%) of NF3 decreased with increasing the concentration of NF3 gas. The DRE of NF3 was about 90% at an absorbed dose of 400kGy.
불용성 전극을 이용한 절삭유의 전기화학적 처리에 관한 연구
양승빈 ( Seung-bin Yang ),장성호 ( Seong-ho Jang ),이재용 ( Jae-yong Lee ),박진식 ( Jin-sik Park ),류재용 ( Jae-yong Ryu ),윤영내 ( Young-nae Youn ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 추계학술발표논문집 Vol.2016 No.-
1900년대 초부터 금속 가공 장비의 수명 연장 및 가공물의 품질 향상을 위해 금속 가공 공정에 절삭유가 이용되어 왔다. 금속 가공 특성에 따라 절삭효율 향상을 위해 각종 첨가제를 포함시켜 여러 종류의 절삭유가 제조되고 있으며, 일반적으로 수용성과 비수용성으로 분류된다. 비수용성 절삭유의 경우, 폐유처리과정에서 유독성 물질 발생, 발연·발화 등의 문제로 수용성 절삭유의 사용이 점차 증가해 왔으며, 국내에서 이용되는 절삭유의 60% 이상이 수용성 절삭유이다. 사용된 수용성 절삭유는 비수용성 절삭유와 같이 소각처리 하기에는 비용이 크며, 수계로 유출시 COD 약 30,000~100,000ppm의 고농도 유기성분에 의해 인근 수계를 오염시킬 수 있으므로 각별한 처리가 필요하다. 따라서 본 연구에서는 Ti-IrO<sub>2</sub>전극을 이용하여 NaCl 첨가, 인가전압 변화를 통해 수용성 절삭유 내 오염물질의 전기화학적 처리에 미치는 영향을 검토하고, 수용성 절삭유의 전기화학적 처리에 대한 기초자료를 제공하고자 한다. 시료는 U사의 W1-1종 수용성 절삭유를 이용하였으며 증류수와 혼합하여 5% 농도의 인공 시료를 제조하였다. 시료의 특성은 Table 1, 실험 조건은 Table 2에 나타내었다.
산사(Crataegus pinnatifida BUNGE)가 지질대사 증후군의 지질성분 및 혈당 완화에 미치는 영향
김한수 ( Han Soo Kim ),김민아 ( Min A Kim ),( Yishan Duan ),장성호 ( Seong Ho Jang ),이원기 ( Won Ki Lee ),류재용 ( Jae Young Ryu ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6
This study was designed in order to determine the influences of haw (Crataegus pinnatifida BUNGE) on the lipid metabolism syndrome. Sprague Dawley rats, 7 weeks old, were given four different types of diets for 5 weeks: ND group (noncholesterolemic diet), HE group (non cholesterolemic diet+haw extract), CD group (cholesterolemic diet), CH group (cholesterolemic diet+haw extract). Concentrations of LDL-cholesterol, triglyceride, phospholipid, free cholesterol, cholesteryl ester, blood glucose were remarkably higher in the CD group than the other groups. But by treatment of haw extract group with cholesterolemic diet (CH group) were significantly decreased compared with CD group. Cholesteryl ester ratio was no difference between CD group and CH group. These results indicate that Crataegus pinnatifida BUNGE would be effective in lipid metabolism syndrome.
타이타늄 스크랩 충진복극과 SUS316 전극을 이용한 수용성 절삭유의 처리
박인수 ( In-su Park ),김고은 ( Go-eun Kim ),장성호 ( Seong-ho Jang ),유시현 ( Si-hyeon Yu ),송영채 ( Young-chae Song ),류재용 ( Jae-yong Ryu ),박진식 ( Jin-sick Park ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
In this study, the Ti scraps were used as bipolar packed-bed electrodes with SUS316 electrodes for treatment of soluble cutting fluid(SCF). The removal efficiency of COD<sub>Cr</sub> from the SCF and oil and the Ti scraps were analysed in accordance with the Ti scrap density, current density, electrolyte type and concentration. The removal efficiency of COD<sub>Cr</sub> after 60 min was 58.4 %, 56.2 %, 63.3 % and 60.3 % for a scrap density of 0, 10, 20 and 30 g/L, while the removal efficiency for oil was 61.8 %, 67.6 % and 65.3 % for a scrap density of 10, 20 and 30 g/L. In addition, the removal efficiency of COD<sub>Cr</sub> after 60min was 63.3 %, 83.5 %, and 89.2 % and that of oil was 67.6 %, 79.8 % and 83.8 % for a current density 40, 60, and 80 A/m<sup>2</sup>. Finally, after testing the system with no electrolyte or with either Na<sub>2</sub>SO<sub>4</sub> or NaCl (5-10 mM), the highest removal efficiency of COD<sub>Cr</sub> a nd o il was 8 9.2 %, and 83.8 %, with no electrolyte and a current density of 80 A/m<sup>2</sup>. In conclusion, the removal of efficiency of COD<sub>Cr</sub> and o il was maximized with a scrap density o f 20 g /L, a current density o f 80 A/m2, and non-electrolyte.
크릴(Euphausia superba)의 영양성분 및 아미노산 조성에 관한 연구
김한수 ( Han Soo Kim ),김민아 ( Min A Kim ),( Yi Shan Duan ),강동수 ( Dong Soo Kang ),장성호 ( Seong Ho Jang ),류재용 ( Jae Young Ryu ),이춘식 ( Chun Sik Lee ),이원기 ( Won Ki Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.2
Despite abundant nutritions, krill is barely used for human consumption. The objective of this study was to investigate the nutritional component and amino acid composition of krill and further utilizes it for food resource. Proximate compositions of krill meal were consisted of crude protein 58.85%, ash 13.89%, crude fat 12.45%, carbohydrate 11.01% and moisture 3.80%. The amount of total amino acid was 54.74 g%, and the major amino acids were glutamic acid (7.71 g%), aspartic acid (6.20 g%), leucine (4.72 g%), lysine (4.41 g%), arginine (6.49 g%) and alanine (3.25 g%), respectively. Total essential amino acid content was 21.87%, and the major amino acids were leucine (4.72 g%), lysine (4.41 g%) and isoleucine (2.90 g%), respectively. Content of total free amino acid in krill meal was 20224.30 mg/kg, and the major free amino acids were taurine (4501 mg/kg), arginine (3130.60 mg/kg), proline (2302.90 mg/kg), alanine (2088.10 mg/kg), glycine (1606.40 mg/kg) and lysine (1197.40 mg/kg). Especially, taurine was the most abundant of all free amino acids. Thus, these data indicate that krill seems to be abundant protein source food.
야생 산사(Crataegus pinnatifida BUNGE)가 이상지질혈증의 BUN 및 Creatinine 농도 저하에 미치는 영향
김한수 ( Han Soo Kim ),김민아 ( Min A Kim ),( Yishan Duan ),장성호 ( Seong Ho Jang ),조한진 ( Han Jin Cho ),류재용 ( Jae Young Ryu ),김상우 ( Sang Woo Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6
This study was investigate the influences of wild haw (Crataegus pinnatifida BUNGE) on lowering blood urea nitrogen (BUN) and creatinine concentrations in dyslipidemic rats. Four groups of rats were fed different diets for 5 weeks: basal diet (BD group), nondyslipidemic diet+feral haw extract (NDF group), dyslipidemic diet (DLD group), dyslipidemic diet+feral haw extract (DFH group). BUN, creatinine and uric acid concentrations were significantly higher in the DLD group than in the BD group. However, DFH group significantly lowered BUN, creatinine and uric acid concentrations compared to the DLD group. Amylase activity was significantly lower in the DLD group than in the BD group, while DFH group significantly higher compared to the DLD group. Lipase activity was also also significantly lower in the DLD group than the other group. Accordingly, these results suggest that haw extract could be effective for improving kidney function in dyslipidemic rats.