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금왕 금·은광산 주변 지구화학적 환경에서의 중금속 원소들의 분산
박종진,김명균,전효택,Park, Jong-Jin,Kim, Myeong-Kyun,Chon, Hyo-Taek 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.5
Soil, tailings, stream sediment and surface water samples collected in the vicinity of the Geumwang Au-Ag mine were analyzed in order to investigate the pollution level of heavy metals and to determine the dispersion patterns. Although the maximum concentrations of soils collected at the flotation plant and tailings dam were 9,270 ppm As, 17 ppm Cd, 1,480 ppm Cu, 10,080 ppm Pb and 18,400 ppm Zn, dispersion of heavy metals were limited in the vicinity of the flotation plant and tailings dam. This may be due to high pH values (> 8.0) of the soils by flotation solution for mineral processing. The pH values of water samples near the flotation plant and tailings dam were over 8.0 and Cd, Cu and Zn concentrations were not detected. The waters in the vicinity of Geumwang mine generally belong to a $Ca^{2+}-SO_{4}{^{2-}}$ $(HCO_3{^-})$ type.
박종진 한국해양과학기술원 2013 Ocean and Polar Research Vol.35 No.2
The underwater glider is an autonomous vehicle that can glide through the ocean interior by using a pair of wings attached to its body and can move up and down through the water column by changing its buoyancy. As of now, there are three widely-used gliders, namely, the Spray that was codeveloped by Scripps Oceanographic Institution and Woods Hole Oceanographic Institution, the Slocum produced by the Webb Research Cooperation, and the Seaglider that was produced by the University of Washington. In this paper, I will introduce these three gliders and discuss the principles and procedures related to glider operation as well as the application and extendability of modern physical and biogeochemical sensors to gliders. My experiences in developing a glider for measuring ocean turbulence and testing it 7 times during 12 days are shared in this paper. On the basis of my experiences and knowledge, different kinds of aspects that should be considered for successful glider operation are discussed. In addition, a suggestion is made as to what would be the ideal way to operate underwater gliders in the East/ Japan Sea. At the end, the current status of active glider operation teams is presented and the efforts to proceed toward future gliders are briefly introduced.
미야자와 겐지의 교육관에 관한 소고(小考) ―동화 「폴라노 광장」을 중심으로―
박종진,최경희 한국아동문학학회 2018 한국아동문학연구 Vol.- No.35
「폴라노 광장」에는 열의와 실천으로 전설 속의 ‘폴라노 광장’을 자신들의 손으로 건설해 내는 소년들의 모습이 형상화 되어 있다. 「폴라노 광장」은 겐지의 이상향 지향을 잘 보여주면서도 작품에 함의된 교육적 지향점을 다음과 같이 찾아볼 수 있다. 첫째, 겐지의 교육 시스템에 대한 비판이다. 전설 속의 옛이야기에 등장하는 ‘폴라노 광장’이 현실 속에서는 추악한 어른들의 정치판이라는 것을 알게 된 소년들은 자신들의 손으로 새로운 ‘폴라노 광장’을 만들 것을 결의한다. 이를 위해서 기존의 학교에서 실시되는 교육과는 다른 새롭고도 지속적인 ‘공부’가 필요함을 인식하게 된다. 학교 교육에서 실시되는 일방적이고 주입식 교육과 지식 중심의 교육에 대해 비판을 가하며 이에 대한 대안을 자율학습 및 평생학습으로 제안한다. 두 번째, 함께 만들어 가는 ‘이상향’의 지향을 찾아볼 수 있다. 겐지는 농학교에서의 가르침을 스스로 실천하기 위해 직접 농사를 지으며 ‘라스치진협회’를 꾸린다. 농민들과 더불어 공동으로 공부하고 농사를 지으며 농촌 개량운동을 실시하고자 했던 시도는 결국 실패로 끝나게 된다. 그러나 겐지는 작품 「폴라노 광장」을 통해서 소년들의 자율성을 강조하면서도 모두가 함께 힘을 모아서 건설해 나가는 이상향 ‘폴라노 광장’의 건설을 역설하고 있다.
人工齒牙우식법을 利用한 數種 充塡材의 邊緣對鎖效果 比較
朴鍾振,趙圭澄 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.7 No.2
The purpose of the study was to compare the marginal sealing effect of amalgam, composite resin and glass ionomer cement restorations placed into cavity in root, by means of artificial caries technique The 100 extracted human 3rd molar teeth were selected, and simple cavities were prepared on root surfaces. The prepared cavities were filled with Optaloy Ⅱ, Optaloy Ⅱ-Vitrabond, Silux Plus, Silux Plus-Vitrabond and Ketac-Fil. All specimens were immersed in lactate buffer solution(pH 4.5) at 37℃ for 15 days. The 80㎛thick sections of restored teeth were prepared and examined under crossed polars of a polarizing microscope, and the depths of the demineralized lesions were measured by means of a calibrated eyepiece graticule. The results were as follows: The marginal leakage was the least in Ketac-Fil group(p<0.05) and there was no significant difference in marginal leakage between Optaloy Ⅱ group and Silux plus group(p>0.05). The marginal leakage was reduced with Vitrabond base in Silux Plus groups(p<0.05), but no significant difference in marginal leakage was observed between Optaloy Ⅱ groups(p>0.05).