http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
산처리 옥수수 전분을 이용한 cyanoethyl starch 의 제조 특성
조용민,신윤섭,정문기 한국공업화학회 1998 응용화학 Vol.2 No.1
In order to develop modified starch using reinforced corrugating medium, this study carried out to decrease reaction time and simplify process cyanoethylation of starch after acid treatment of native corn starch. Native corn straches(81g oven dried) were reacted with 150mL of 5% aqueous hydrochloric acid at 40℃ for 30minutes. Acid treated starches(ATS) were cyanoethylated to the 0.1 to 0.4 ratios AN/ATS under alkali condition(pH 12) at 40℃. The degree of substitution(DS) of cyanoethylated starches was 0.003∼0.019 with reaction times(30, 60 and 120 minutes). The preparation of handsheets has been with 1%, 2% and 3% of CES add levels with DS, respectively. The strength properties of handsheets added CES showed a tendency to increase in comparison with untreated handsheet, especially, the compression strength(ring crush) or handsheets was highest in 3% add level of DS 0003 CES.
국가 바이오모니터링 프로그램을 위한 소변 중 금속류 동시분석법 개발 및 검증
조용민,양민호,임호섭,차상원,이재익,김기훈,한상범 한국환경보건학회 2019 한국환경보건학회지 Vol.45 No.6
Objectives: This study developed and validated an analysis method of urinary metals and metalloids that can be applied inductively with coupled plasma mass spectrometry (ICP-MS). Methods: 0.3 mL of urine was used to analyze 25 metal and metalloid compounds using ICP-MS. The validation of the analytical method included linearity, accuracy, precision, and the calculation of detection limits. In addition, a comparison test was performed with the graphite furnace atomic absorption spectrometry (GF-AAS) method, which is the current standard method, with urine samples of 66 healthy subjects. Results: The linearities (R2 ) of calibration curves of all 25 compounds were ≥ 0.999. Of the 25 compounds, the intra-day and inter-day accuracy% of 17 and 20 met ≤15%, respectively. In addition, fifteen compounds showed ≤15% recovery% for certificated reference materials. Intraclass correlation coefficients of the comparison between the current methods and new methods in this study were 0.952 (p-value<0.001) and 0.911 (p-value<0.001) for urinary cadmium and mercury, respectively. Conclusion: This study proposes an efficient simultaneous methodology that can analyze multi elements in smaller sample amounts. More reproduction experiments are needed in the future.
부유부상 오존처리에 의한 국산 폐골판지(KOCC) 물성향상
조용민,신윤섭,서경원,신필수,이용무 한국공업화학회 2000 한국공업화학회 연구논문 초록집 Vol.2000 No.1
N/A N/A
Foreign Ownership and Firm Innovation: Evidence from Korea
조용민,오동철,유희찬 연세대학교 동서문제연구원 2019 Global economic review Vol.48 No.3
This study examines whether foreign equity investment promotes domestic firms’ innovation activities. Using panel data on the Korean firms during the 1999–2013 period, we find that foreign ownership has a positive effect on firms’ innovation activities. Furthermore, we also show that, as compared to non-chaebol firms, chaebol firms’ innovation activity becomes much greater with the increase of foreign ownership. Finally, we investigate industry-level spillover effects of innovation. Specifically, we find that foreign ownership promotes innovation activities via forward linkage, the effect of which is also more pronounced in chaebol firms.