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김재근,유선혜,황건,황진희 대한두개안면성형외과학회 2009 Archives of Craniofacial Surgery Vol.10 No.2
Purpose: Recently, orbital wall fracture is common injuries in the face. Facial CT is essential for the accurate diagnosis and appropriate treatment to reconstruct of the orbital wall. The objective of this study was to report the method for accurate measurement of area and shape of the bony defect in the blow-out fractures using facial CT in prior to surgery. Methods: The authors experienced 46 cases of orbital wall fractures and examined for diplopia, sensory disturbance in the area of distribution of the infraorbital nerve, and enophthalmos in the preoperation and followed 1 months after surgery, from August 2007 to May 2008. Bony defect was predicted by measuring continuous defect size from 3 mm interval facial CT. Copying from the defect model (template), we reconstructed orbital wall with resorbable sheet (Inion CPS® , Inion Oy, Tampere, Finland). Results: One months after surgery using this method, 26 (100%) of the 26 patients improved in the diplopia and sensory disturbance in the area of distribution of the infraorbital nerve. Also 8 (72.7%) of the 11 patients had enophthalmos took favorable turn. Conclusion: This accurate and time-saving method is practicable for determining the location, shape and size of the bony defect. Using this method, we can reconstruct orbital wall fracture fastly and precisely.
김재근 대한전자공학회 1991 전자공학회지 Vol.18 No.12
CCITT에 의해서 표준화 되고 있는 SDH(synchronous digital hierarchy)기본의 광대역 전송방식과 이의 향후 응용 방향에 대해 개관한다. 또한 광대역 전송방식으로서 고려될 수 있는 STM(synchronous transfer mode)망과 ATM(asynchronous transfer mod)망의 구조를 살펴보고 1991년도를 중심으로 일어나고 있는 이들 각각의 국내ㆍ외적인 표준화 동향, 기술개발 현황, 그리고 망구축 동향 등에 대해서 간단히 기술한다.
중학교 생물교과 내용과 여의도 샛강 생태공원 생태 교육 프로그램의 연계성 분석
김재근,이보은 한국현장과학교육학회 2008 현장과학교육 Vol.2 No.1
To provide opportunities for middle school students to participate outdoor activities related to biology subjects at school and suggest direction of program development for compensating shortcomings at school activities and outdoor activities, inquiry activities in biology section of middle school science textbook related to outdoor activities and ecological education programs at Yeoeudo-saekgang eco-park were compared. There were small similarity between ecological education program at eco-park and inquiry activities in textbook. Inquiry activities in middle school textbooks were related to observation and recording field and most of these activities could be done through outdoor activities. This suggest that in-school activities and outdoor activities can compensate their shortcomings in case of proper choice. Also, this study suggest to develop programs which consider interests of in-school education and outdoor activities at eco-parks. These programs might be helpful to achieve some education goals in activities. 본 연구는 중학교 과학(생물)교과서의 탐구활동 중 야외활동에 관련된 주제를 분석하였으며, 이를 여의도 샛강 생태공원의 생태 프로그램과 비교하였다. 이를 바탕으로 중등학교 교육에서 행하기 어려운 야외활동 주제를 여의도 샛강 생태공원에서 실제로 체험할 수 있는 기회를 제공하고자 하였으며, 중등학교 교육과 여의도 샛강 생태공원이 상호보완을 통해 발전할 수 있는 기초를 마련하고자 하였다. 분석결과 학교 내 수업활동과 학교 밖 기관의 생태 프로그램 사이에 적으나마 유사성을 확인할 수 있었다. 중학교 탐구 활동의 대부분은 관찰ㆍ기록 영역에 존재하였으며 이를 실제로 체험할 수 있는 생태프로그램이 상당수 존재하였다. 그 연계내용이 완벽하고 많은 것은 아니지만 이를 적절히 알고 활용한다면 단순히 하루만 참여하는 교외 활동 수업에서 벗어나 학교 수업에서 배운 것을 확인하고 실제로 적용해 볼 수 있는 살아있는 활동 수업이 될 것이다. 이를 위해서 학교는 좀 더 학교 밖 기관에 관심을 가지고 기관은 좀 더 학교의 관심을 받아들여 그것을 반영하는 형태로 프로그램을 개발해 나간다면, 더 좋은 연계효과를 얻을 수 있을 것이다.
김재근 한국생태학회 2012 Journal of Ecology and Environment Vol.35 No.2
Litterfall dynamics in forests are assessed by estimating biomass production and decomposition. However, there have been few studies on how litter dynamics impact the health and management of ecosystems. Here, a new approach to measure and assess ecosystem function is presented based on conventional methods using littertraps, litterbags, and the mass on the forest floor. To assess the status of litter dynamics, the decay rate (k) was estimated from a litterbag experiment,and removal rates (ki) were determined from mass balance on the forest floor at 21 sites on three mountains in South Korea. The k3 (organic mass ratio of Oi and Oe + Oa + A horizons in November) values in an equilibrium state in South Korea were within the range of k ± 0.174 when considering the annual variation of litterfall production. This study also suggests that sampling sites for these types of studies should be in the middle, not at the ends, of steady slopes on the forest floor.