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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.
조용민,류승훈,최민석,서성철,정지태,최재욱,Cho, YongMin,Ryu, SeungHun,Choi, Min Seok,Seo, SungChul,Choung, Ji Tae,Choi, Jae Wook 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.5
Objectives: This study was performed in order to determine airborne fungi levels in homes and find related factors that may affect airborne fungi concentration. Methods: Fifty homes were study subjects for measuring airborne fungi. For sampling airborne fungi, the impaction method on agar plates was used and samples were counted as colony forming units per cubic meter of air ($CFU/m^3$). In addition, information regarding housing characteristics and atopic disease in each home were collected via questionnaire. Results: The geometric means (GM) of airborne fungi concentrations in fifty living rooms and bedrooms were 68.03 and 62.93 $CFU/m^3$, respectively. The GM of airborne fungi concentration in atopy homes was 78.42 $CFU/m^3$. This was higher than non-atopy homes' 54.34 $CFU/m^3$ (p-value=0.051). In the results of the multiple regression analysis, outdoor airborne fungal concentration proved a strong effective factor on indoor airborne fungal concentration. Also, construction year, floor area of house, indoor smoking and frequency of ventilation were factors that showed a significant association with indoor airborne fungi concentration. Conclusions: The results of this study show that some housing and living characteristics may affect the development and increase of airborne fungi. In addition, exposure to airborne fungi may be a risk factor for the prevalence of childhood atopic diseases.
부유부상 오존처리에 의한 국산 폐골판지(KOCC) 물성향상
조용민,신윤섭,서경원,신필수,이용무 한국공업화학회 2000 한국공업화학회 연구논문 초록집 Vol.2000 No.1
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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.
조직접착제가 가토 피부창상 치유과정에 미치는 영향에 관한 실험적 연구
조용민,엄인웅,민승기,김수남 원광대학교 치의학연구소 1993 圓光齒醫學 Vol.3 No.1
This experimental study was designed to investigate the wound healing process treated with fibrin adhesive in the dorsum of 12 rabbits. Fibrin adhesive which acts on the final phase of blood coagulation in wound healing process have increasingly been used and applied to the free skin grafting wounds and incisional surgical wounds to compare both convetional wound cares. In each experimental groups were sacrified at 1, 2, 3, 5, 7, 14 days postoperatively and specimens have made as a usual methods. The results were as follows 1. Initial hemorrhagic coagulation was prominent in the experimental groups and degree of inflammatory cell infiltrations, however, was marked as even in each groups. 2. Early fibroblast and new capillary proliferation were incorporated intensely with wound sites in the experimental groups. 3. By applying the tissue adhesive to wound sites, the initial healing process for closing in grafting operation was faster than the incisional surgical wound.
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.