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김원일(Won Il Kim),김형진(Hyung Jin Kim),홍인권(In Kwon Hong) 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.2
N/A The thermal degradation kinetics of SBR and tire were studied using a conventional thermogravimetric analysis in the stream nitrogen at a heating rate of 5, 10, 15, 20℃/min, respectively. Thermogravimetric curves and their derivatives were analyzed using various analytical methods to determine the kinetic parameters. The degradation of the SBR and tire was found to be a complex process which has multi-stages. The Friedman method gave average activation energies for the SBR and tire of 247.53kJ/㏖and 230.00kJ/㏖, respectively. Meanwhile, the Ozawa method gave 254.80kJ/㏖ and 215.76kJ/㏖. It would appear that either. Friedman`s differential method or Ozawa`s integral method provided satisfactory mathematical approaches to determine the kinetic parameters for the degradation of the SBR and tire. Approximately 86% and 55% of oil products were obtained at a final temperature of 700℃ and a heating rate of 20℃/min for the SBR and tire respectively.
광산인근 논토양의 카드뮴 존재형태와 쌀의 카드뮴의 함량과의 관계
김원일(Won-Il Kim),박병준(Byung-Jun Park),박상원(Sang-Won Park),김진경(Jin-Kyoung Kim),권오경(Oh-Kyung Kwon),정구복(Goo-Bok Jung),이종근(Jong-Keun Lee),김정규(Jeong-Gyu Kim) 한국토양비료학회 2008 한국토양비료학회지 Vol.41 No.3
To assess the relationship between Cd fraction in paddy soils and Cd in polished rice, soils and rice were analyzed at the 3 Cd contaminated paddy fields near closed mines. Major Cd fractions of A field were organically bound (62.6%) and Fe-Mn oxide bound (25.3%) forms. In case of B field, major Cd fractions of B1 field were carbonate bound (46.3%) and Fe-Mn oxide bound (31.6%) form whereas B2 field were residual (54.3%) and carbonate bound (21.8%) form, respectively. It showed a huge difference of Cd fraction each other. 0.1M HCl extractable Cd in soil was positively correlated with Cd in rice. Specially, the ratios of 0.1M HCl extractable Cd against total Cd content in soils were 13.7%, 2.6%, and 0.45% in A, B1, and B2 fields, respectively. These ratio were largely affected with Cd uptake to rice grain. Also, exchangable, Fe-Mn oxide bound, and carbonate bound form, which are partially bioavailable Cd fraction to the plant, were positively correlated with Cd in rice while organically bound and residual form was not correlated. Multiple regression equation was developed with Rice Cd = -0.02861 + 0.07456 FR 1(exchangeable) + 0.00252 FR 2(carbonate bound) + 0.001075 FR 3(Fe Mn oxide bound) - 0.00095 FR 4(organically bound) - 0.00348 FR 5(residual) (R<SUP>2</SUP> = 0.7893***) considering Cd fraction in soils.
김원일 ( Won-il Kim ) 대한한의진단학회 2012 大韓韓醫診斷學會誌 Vol.16 No.3
Objectives This research was designed to study the characteristics of heart rate variability in acute dyspepsia patients compared with normal group. Methods The testing of HRV was carried out at Oriental Medical Center of ○○University with the participation of 94 acute dyspepsia patients and 85 control group people. We checked HRV of the 2 groups that were checked on the first visit day and compared HRV index between groups. Results In the frequency domain analysis, HF, LF, VLF, LF/HF ratio, TP were significantly lower than control group on acute dyspepsia patient group. HF, LF, VLF, LF/HF ratio, TP were not significantly associated with age. Conclusions According to this study, autonomic nerve system was more decreased on the acute dyspepsia patient group compared with the control group. Though further studies will be needed, the present finding provide us the possibility that stress is a major cause of the acute dyspepsia along with food factor.
김원일 ( Won Il Kim ),이지호 ( Ji Ho Lee ),( A. Kunhikrishnan ),고우리 ( Woo Ri Go ),이정미 ( Jeong Mi Lee ),백민경 ( Min Kyoung Paik ),류지혁 ( Ji Hyock Yoo ),김지영 ( Ji Young Kim ) 한국환경농학회 2012 한국환경농학회 학술대회집 Vol.2012 No.-
농촌진흥청 및 환경부의 폐금속 광산인근 농경지 중금속 오염 모니터링에서 비소에 의한 오염이 상당수 확인되고 있고, 또한 코덱스오염물질분과위원회에서는 2010년부터 쌀의 비소기준 설정을 위한 논의가 계속되고 있어 농업환경 및 농산물에 대한 비소 관리가 시급한 실정이다. 이에 따라 본 발표에서는 우리나라 농업환경 및 농산물의 비소오염 기준설정, 모니터링, 환경 위해성 및 독성, 작물로의 흡수이행, 복원을 통한 오염 저감화에 대한 화학물질안전과 무기화학연구실에서 수행한 현재까지의 현황 및 연구동향을 소개하고자 한다. 본 초록에서는 2009년부터 2010년까지 수행한 우리나라 폐금속 광산인근 지역에서의 비소오염 현황 및 환경위해성 평가 결과에 대해서만 언급하고자 한다. 국내 24지점의 폐광산 주변 지역에서 논토양, 용수 및 재배된 쌀의 비소 오염도를 조사하였고, 인체에 대한 평균 일일 노출량(ADD)을 산정하여 발암 위해 확률을 평가하였다. 광산인근에서 재배된 쌀 중 총 비소의 평균 농도는 0.123 mg/kg으로 조사되었다. ADD값은 총 비소농도함량을 고려하여 FAO/WHO에서 정한 2.1 ㎍/kg b.w./day의 PTDI값을 초과하지 않았다. 그러나, 일부 폐광인근에서 재배한 쌀을 섭취했을 경우, 인체의 발암 위해 확률은 허용수준인 10-4 범위를 초과하였고, 따라서 비소로 오염된 쌀을 장기간 섭취하게 된다면 인체 독성영향의 가능성은 있는 것으로 판단된다. 이들 결과를 통하여 비소오염 논토양에 적절한 관리방안을 도출하고 안전농산물 생산에 기여할 것이다.