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제주도 현무암에 포획된 페리도타이트에 산출되는 맨틀 기원의 CO₂-유체포유물
서민영(Minyoung Seo),우용훈(Yonghoon Woo),박근영(Geunyeong Park),김은주(Eunju Kim),임현수(Hyoun Soo Lim),양경희(Kyounghee Yang) 한국암석학회 2016 암석학회지 Vol.25 No.1
제주도 현무암에 산출되는 첨정석 페리도타이트 포획암에 CO₂-유체포유물이 포획되어 있다. 이 CO₂-유체포유물들은 규칙적인 결정면으로 둘러싸여 있으며 세립의 네오블라스트 결정에는 일차포유물로, 조립의 반상쇄성에는 이차포유물로 산출된다. 냉각/가열 실험에서 CO₂-유체포유물의 삼중점은 -57.1℃(±0.9℃)로서 대체로 균질하다. 이는 이 CO₂-유체포유물들이 거의 순수하게 CO₂로 이루어져 있음을 의미한다. 그러나 균질화 온도는 -39℃(ρ=1.12 g/㎤))에서 23oC(ρ=0.82 g/㎤))로 넓은 범위에 걸쳐 나타나며, 이는 많은 유체포유물이 포획된 이후 재평형 되어졌음을 반영한다. 일차/이차포유물과 균질화온도 사이에 체계적인 차이는 없다. 가장 낮은 균질화온도(즉, 가장 높은 밀도)를 보이는 유체포유물에서 계산된 포획 압력은 ≈0.9 ㎬이다. 제주 페리도타이트와 CO₂-유체포유물의 조직적 특성과 낮은 균질화 온도는 CO₂-유체가 맨틀기원의 유체로서 상부 맨틀암석권에서 페리도타이트의 재결정화 작용 동안 존재하던 유체로 해석된다. CO₂-유체의 포획은 제주 페리도타이트의 진화과정에서 후기의 사건이며, 상부맨틀 암석권의 상부(천부)에서 일어났음을 지시하고 있다. Negative crystal shaped CO₂-rich fluid inclusions, trapped as primary inclusions in neoblasts and as secondary inclusions in porphyroblasts, were studied in spinel peridotite xenoliths from Jeju Island. Based on microthermometric experiments, the solid phase melts at -57.1℃(±0.9℃) with no other observable melting events, indicating that the trapped fluid is mostly CO₂. The homogenization temperatures show a much wider range from -39℃(ρ=1.12 g/㎤)) to 23oC(ρ=0.82 g/㎤)), suggesting that most of the inclusions (originally trapped at mantle conditions) re-equilibrated to lower density values. Nevertheless, the highest density CO₂ in our fluid inclusions is consistent with entrapment of fluids at upper mantle pressures (and depths). The calculated trapping pressure from CO₂-rich fluid inclusions that appear to be free from re-equilibrium, e.g., showing the lowest homogenization temperatures, is ≈0.9 ㎬. Based on the petrographic evidences, the fluid entrapment can be regarded as a late stage event in the evolution of the shallow lithospheric mantle.
핵의학과 방사선작업종사자의 말단 및 수정체 선량에 대한 인식도 조사
류영환 ( Younghwan Ryu ),서민영 ( Minyoung Seo ),동경래 ( Kyungrae Dong ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.3
Radiation workers working in nuclear medicine department are exposed to radiation, especially in extremities and the eye lens, due to their work consisting of distributing radioactive isotopes and injecting patients with the radiological materials. The assessment of radiological exposure to the extremities and the eye lens using whole body effective dose assessment method cannot be deemed valid; Because the extremities and the eye lens cannot be constantly protected, there needs to be another dose assessment method. Despite the apparent error in the current assessment method, radiation workers in nuclear medicine department overlook exposure to radiation in the extremities and the eye lens, leading to the current lack of exposure dose control. As such, we set out to understand the radiation workers’ level of knowledge and awareness in this issue by surveying 33 radiation workers working in Korean nuclear medicine department. As for the level of knowledge about the dosimeter for extremities and the eye lens, most radiation workers were aware that radiation exposure in the extremities and the eye lens took place during their work, as well as yearly exposure dose limit, but they were not as knowledgeable about the dosimeter. In the assessment of the radiation workers’ awareness of dosimeter, these professionals acknowledged the necessity of wearing a dosimeter to manage the exposure dose in the extremities and the eye lens, although their level of understanding and trust for these products were rather low. In the current usage of dosimeters in nuclear medicine department, it was revealed that most radiation workers do not wear dosimeters during their work, which led to the lack of exposure dose assessment during distribution and injection tasks. As such, the current study concludes that policies on exposure dose measurement and assessment are required to optimize the amount of exposure to the extremities and the eye lens in radiation workers, in addition to continued education and training to change awareness about controlling the exposure dose.
성경정 ( Kyeongjeong Seong ),서민영 ( Minyoung Seo ),동경래 ( Kyungrae Dong ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.3
The current study had the radiation workers working in nuclear medicine department wear individual exposure dosimeters in the front and in the back, considering the underestimated individual exposure to radiation from patients undergoing radiological medicine treatment. The utility of the device was assessed in the study. From January 2015 to February 2015, 85 radiation workers working in 11 Korean nuclear medicine department were analyzed by their workplace and their specialty; PET-CT and gamma cameras were used to analyze the radiation exposure in the front and the back of the radiation workers. This revealed that the exposure measurement and assessment using the dosimeter worn on the front were not underestimated. However, because this measurement did not take into account the adequate radiation weighting factor for the back side dosimeter, a radiation exposure assessment algorithm for the back side radiation exposure must be developed, which can be used as a basic data for introducing double dosimeter for radiation workers working in nuclear medicine department.
이주영(Ju-Young Lee),허혜정(Haejung Hu),박미정(Mijung Park),이선규(Sunkyu Lee),서민영(Minyoung Seo),유주희(Juhee Yoo) 한국컴퓨터정보학회 2012 한국컴퓨터정보학회 학술발표논문집 Vol.20 No.2
그림 툴은 실시간 비디오 영상 스트림과 트래킹 시스템을 통해 사용자의 손가락 움직임의 입력을 받아 가상의 오브젝트들을 그려서 보여주는 툴이다. 핵심개발기술은 병렬처리언어인 CUDA사용하여 개발된 저가의 비전 기반 트래킹 시스템이다. 저가의 트래킹 시스템과 그림툴의 설계, 구현, 앞으로의 발전 방향에 대해 설명한다.