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부산 금정산화강암체의 암석학 및 Rb-Sr 전암 등시선 연대
윤성효(Sung-Hyo Yun),고정선(Jeong-Seon Koh),박광순(Kwang-Sun Park),안효찬(Hyo-Chan Ahn),김용일(Young-Il Kim),유성현(Sung-Hyeon Yoo),이동한(Dong-Han Lee),윤기영(Gi-Young Yun) 한국암석학회 2005 암석학회지 Vol.14 No.1
부산 금정산화강암체를 구성하는 화강암류는 암상별로 화강섬록암, 각섬석화강암, 아다멜라이트, 토날라이트, 흑운모화강암 및 미문상화강암으로 구성된다. 금정산화강암의 지화학적 특성은 이들 화강암류가 칼크-알칼리암계열, Ⅰ-형 화강암에 속하며, 화강섬록암질 마그마로부터 사장석의 분별 결정화작용에 의해 각섬석화강암, 아다멜라이트 및 흑운모화강암, 미문상화강암으로 진화하였음을 잘 보여준다. 화강암의 최저용융조성의 결정화 압력과 온도는 1-5 kbar와 720-700°C로 계산된다. 금정산화강암체의 각 암상에서 측정한 Rb-Sr 전암 연대는 69.6±1.9 Ma이며, Sr 동위원소의 초생비는 0.70503±0.00015이다. 미량원소와 희토류원소의 조성 변화에서 높은 LILE/HFSE 비와 LREE의 부화 경향을 나타내는 데, 이는 금정산화강암체가 백악기말 섭입대 환경에서 생성된 대륙연변호 칼크-알칼리암의 전형적인 화강암 계열의 특성이다. The granitoids in the Mt. Geumjeong, Busan can be divided into granodiorite, hornblende granite, adamellite, tonalite, biotite granite and micrographic granite. The geochemical characteristics of the Mt. Geumjeong granites indicate that they were crystallized from a calc-alkaline series and that they belong to Ⅰ-type granitic rocks which evolved from granodioritic magma into hornblende granite, adamellite, biotitie granite, and finally micrographic granite through fractional crystallization of plagioclase. The crystallization pressures and temperatures of the minimum melt compositions of the granitic rocks were estimated to about 1-5 kbar and 720-700°C. The trace element composition and REE patterns, characterized by a high LILEJHFSE ratio and enrichments in LREE, indicate typical continental margin arc calc-alkaline rocks produced in the subduction environment. The Rb-Sr isotopic data for the Mt. Geumjeong granites define a well-defined isochron yielding as age of 69.6± 1.9 Ma with an initial Sr isotopic ratio of 0.70503.
Design of Immersive Experience Training System with Virtual Reality Technology (VR)
Seon-Hui Bak(박선희),Gi-Young Yun(윤기영),Tae-Jun Choi(최태준),Hyun-Bea You(유현배),Jong-Hwan Bae(배종환) 한국디지털콘텐츠학회 2018 한국디지털콘텐츠학회논문지 Vol.19 No.12
With the 4th Industrial Revolution, the battlefield environment has shifted to network-oriented, and the need for M & S(Modeling & Simulation) is increasing day by day. In the current environment where the development costs of the advanced weapon system and the training cost increase rapidly and the complexity of design, test evaluation and production increases, M & S can effectively reduce time and cost by reducing the risk of development failure have. However, in the case of training contents using M & S, the sense of user immersion is low. In this paper, we propose a training system using virtual reality technology which can maximize immersion through interaction and complement the limitations of existing training methods. The designed training system is designed with mission editor, instructor control system, situation display, simulation of the fighting and experience of the equipment operation procedure. More intensive training than existing M & S is possible.
단측 미세혈관문합에서 종축절개 또는 타원형절제에 의한 동맥구형성이 문합부 개통성에 미치는 영향에 관한 비교연구
유창현,김지혜,윤기영 대한혈관외과학회 1999 Vascular Specialist International Vol.15 No.1
The fashion of vascular anastomosis, end-to-end or end-to-side (E-to-S), are depended upon surgeon' s preference or surgical situations. In E-to-S anastomosis two different methods of arteriotomy are applicable but it has been suggested the type, either elliptical or slit arteriotomy, play a different role in the flow hemodynamics. We thought that the difference is more considerable in microvascular surgery. This study examines the effects of elliptical versus slit arteriotomy on morphologic vessel patency. Twenty male Sprague-Dawley rats were divided into two groups of ten rats each. Both carotid arteries were selected as a experimental model. During the procedures the rat brain was tolerable to ischemia and all animals were survived after operations. The morphologic analysis of anastomosis site was through resin-casting method with scanning electromicroscopic examination. The results showed notable difference between two groups in three-dimensional morphology at two-month of operation. This difference may affect the flow hemodynamics and long-term vessel patency. In microvascular anastomosis, the mortpologic difference of the elliptical arteriotomy is worse than slit arteriotomy which compromises the vessel circumference.