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김남형,이미경,이서래 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-
인위적으로 phenthoate 농약성분을 부착시킨 쌀의 취반(炊飯), 즉 수세 및 가열조리시 농약잔류분의 제거율을 실험한 결과는 다음과 같다. 가정에서의 세척방법에 준하여 3회 반복 수세한 쌀에서 phenthoate는 49%가 잔존하였으므로 수세에 의해 51%가 제거되었다. 수세과정에서는 첫번째 세척액(뜨물)에서 37.3%(여과액 7.8%, 잔사 29.5%), 두번째 세척액에서 14.3%(여과액 6.2%, 잔사 8.1%), 세번째 세척액에서 8.9%(여과액 5.8%, 잔사 3.1%)가 제거되었다. 세척액 중 phenthoate 잔류분은 뜨물 여과액보다 뜨물 잔사에서 더 많이 발견되었다. 전기밥솥에서 가열조리한 쌀밥에서 phenthoate 잔존율은 41%이었으므로 수세 및 가열조리에 의해 오염된 phenthoate의 59%가 제거되었다. Phenthoate 성분은 열에 안정해 취반시에도 분해되지 않는 것으로 생각된다. 결론적으로 쌀 중에 잔류하는 phenthoate 성분은 취반과정시 주로 수세과정에 의하여 제거되므로 가열조리전 수세과정을 반드시 3회 이상 거치는 것이 바람직하다. 본 연구결과는 쌀 중 phenthoate의 잔류 허용기준 설정시 감소계수(0.4)로 활용될 수 있을 것이다. This study was undertaken in order to elucidate the elimination of phenthoate residues by washing and cooking processes of rice which is the most important food crop in Korea. When contaminated rice was washed with distilled water three times, the removal rate of total phenthoate was 51%. The removal rate in the successive washings was 37.3%(wash filtrate 7.8%, wash sediment 29.5%)in the first, 14.3%(wash filtrate 6.2%, wash sediment 8.1%)in the second and 8.9%(wash filtrate 5.8%, wash sediment 3.1%)in the third washings. More than half of the residue was removed by the first washing and most residues were foumd in the sediment rather than in the filtrate of the rice washings. The residue rate of phenthoate after cooking by an electric rice cooker was 41%, indicating that the removal rate after cooking was 59%, because phenthoate is thermally stable at the cooking temperature. In conclusion, phenthoate residues contaminated in rice grains are greatly removed in the washing process and it is desirable to wash the grains before cooking in order to decrease the hazards from pesticide residues such as phenthoate. Reduction factor of phenthoate in rice cooking is proposed to be 0.4.
Analysis of Offshore Wind Tower against Impulsive Breaking Wave Force by P-Y Curve
김남형,고명진 한국항해항만학회 2015 한국항해항만학회지 Vol.39 No.5
In offshore, various external forces such as wind force, tidal current and impulsive breaking wave force act on offshore wind tower. Among these forces, impulsive breaking wave force is especially more powerful than other forces. Therefore, various studies on impulsive breaking wave forces have been carried out, but the soil reaction are incomplete. In this study, the p-y curve is used to calculate the soil reaction acting on the offshore wind tower when an impulsive breaking wave force occurs by typhoon. The calculation of offshore wind tower against impulsive breaking wave force is applied for the multi-layered soil. The results obtained in this study show that although the same wave height is applied, the soil reaction generated by impulsive breaking wave force is greater than the soil reaction generated by wave force.