http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
벼, 콩 및 채소류에 대한 Mn-54, Co-60, Zn-65, Cs-137의 토양-작물체간 전이계수
박찬걸,조용우,최용호,김국찬,이창우,이강석,이정호 대한방사선 방어학회 1991 방사선방어학회지 Vol.16 No.2
벼, 콩, 상치, 당근, 호박의 가식부위에 대하여 몇가지 토양에 있어서 토양-작물체간 Mn-54, Co-60, Zn-65, Cs-137의 전이계수를 포트 재배에 의한 방사성 추적자 흡수실험을 통하여 조사하였다. 핵종간 전이계수는 거의 모든 경우 Zn-65>Mn-54>Cs-137>Co-60의 순이었다. 콩이 벼보다 전반적으로 한 자리 정도 높은 값을 보였고 채소류의 경우에는 대체로 상치에서 가장 높고 호박에서 가장 낮은 값을 보였다. 강산성 토양에서는 약산성 토양에서보다 전이계수가 훨씬 높았다. 본 조사결과에 입각하여 한국인의 섭식경로 피폭선량 평가에 이용하기 위한 각 핵종의 전이계수치가 작물별로 제안되었다. Soil-to plant transfer coefficients of Mn-54, Co-60, Zn-65 and Cs-137 were estimated for the edible parts of the rice, soybean, lettuce, carrot, and squash grown in different soils by radiotracer uptake experiments using pot cultures. The transfer coefficients of radionuclides were n the order of Zn-65>Mn-54>Cs-137>Co-60 in most of the cases studied. The coefficients for soybean were roughly and order of magnitude higher than those for rice. Among vegetables, lettuce mostly showed the highest value and squash, the lowest. In the strongly acidic soils. From the data obtained, crop-specific transfer coefficients of the four nuclides were proposed for the use in Korean food-radiation dose assessment.
Next-Generation Converged Networking in Korea: The Concept and Its R&D Activities
Kang, Kug-Chang,Park, No-Ik,Lee, Soon-Seok,Kim, Young-Sun,Jun, Kyung-Pyo The Korea Institute of Information and Commucation 2006 Journal of communications and networks Vol.8 No.4
In Korea, we witness vivid evidences of changing trend in communication that insist the emergence of new networking architecture. To accommodate the changing trend and to hold current strong position in global IT industry, Korea have launched broadband convergence network (BcN) initiative. BcN vision for Korea is to be the first in the world to realize converged network infrastructure and ubiquitous service environment. In this paper, we have introduced the concept and the vision of BcN with a viewpoint of a new paradigm to prepare future-proof communication environment. And then, we have disclosed BcN research and development (R&D) activities including R&D philosophy, R&D phases, and key technologies required. Also, we have discussed current development issues in three technology branches including service and control technology, unified transport technology, and next-generation access technology.
권건영,강창수,이영국 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.3
The authors observed morphological changes with light microscopy and scanning electron microscopy of 8 patients with osteoarthritis caused by avascular necrosis whose articular cartilage of femoral head was classified by the degree of injury. In light microscopy, the articular cartilage of stage Ⅱ patient appeared homogenous in structure, composed of a dense ground substance and chondrocytes. But in the other atient of stage Ⅱ could be visualized partial degeneration change and loss of articular surface and chondrocytes. In the case of stage Ⅲ, the chondrocyte cluster could be seen just underneath the surface which enabled us to observe and irregular articular surface. The number of chondrocytes were also increased on the superficial and middle portions. In the case of stage Ⅳ, sever degenerative change of articular cartilage and subchondral bone were observed. In the mild osteoarthritic articular cartilage, there were observed marked ultrastructural differences in the articular surface, the subsurface fibrillar framework of the matrix and chondrocytes. It was estimated that the organization of collagen fibrils in articular cartilage shows a three-dimensional network with a special system in each zone. In the severe osteoarthritic cartilage, it is observed degenerated chondroid materials, destroyed and irregular oriented collagen fibers and amorphous conglomeration. In the mild osteoarthritis caused by avascular necrosis of femoral head is initially developed from minor disruption of ultrastructural collagen fibrils due to an excessive tensile stressed than eventually progressed to osteoarthritis. The result of this study was acquired from a small number of specimens but such a study may provides very helpful information in the analysis of other diseases related to articular cartilage if similar continued research is carried out in the future as there are few reports as yet published on the morphological structure of articular cartilage.
손상평가 기법을 이용한 Hi-Form 접합부의 강성평가
장극관 ( Chang Kug-kwan ),천영수 ( Chun Young-soo ),강우주 ( Kang Woo-joo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This paper provides the results from evaluating the stiffness of Hi-form junction by an experiment and the system identification method using the dynamic modal data, and the reasonable modeling method of Hi-Form junction which is proposed for improved stair construction recently. Based on the crack pattern and load-displacement relationship and the damage distribution, it can be judged that Hi-form junction can't fullly transfer the forces between the elements linked, and we propose that the junction is modeled as a element which have a stiffness with 50% decrease.
Effect of Annealing on Hysteresis and Eddy Current Components of Iron Loss in Non-Oriented Steels
Song,Chang-Yul,Kang,Yi-Kug,辛龍德 圓光大學校 1995 論文集 Vol.29 No.2
小型 變壓器, 小型모터와 같은 電氣用品의 磁性材料로 가장 많이 使用되고 있는 浦港製鐵 無方向性 電氣銅板 PN-18, 20, 30, 60등을 燒鈍의 SRA(Stress Relief Annealing) 工程을 거쳤을 때, 鐵損[W], 透磁率[μ] 및 磁氣誘導[B]등의 磁氣的 特性 變化를 實驗·調査하였다. 燒鈍 後의 鐵損은 1.5[T] 50Hz와 1.0[T] 50Hz에서 各各 3.071∼7.819[W/kg]이 2.88∼5.492[W/kg]으로, 1.377∼3.988[W/kg]이 1.213∼2.134[W/kg]로 顯著히 減少하지만 磁氣誘導는 微細한 變化를 보였다. 따라서, 燒鈍의 SRA 工程은 無方向性 電氣銅板의 鐵損 및 磁氣的 特性에 重要한 變化를 일으킨다. This paper focuses on results of relative permeability [μ], core less[W] and magnetic induction [B] measurements on some of the most commonly used core materials(PN-18, 20, 30, 60, Pohnag Iron & Steel Co., Ltd.) in case of Stress Relief Annealing(SRA). Results of magnetic induction[B] showed weak variations but core loss reduced strongly after SRA. Core loss reduced from 3.071∼7.819[W/kg] and 1.377∼3.988[W/kg] to 2.88∼5.492[W/kg] and 1.213∼2.134[W/kg] at 1.5[T] 50Hz and 1.0[T] 50Hz respectively after SRA. This SRA process leads to significant changes in magnetic properties and core loss of non-oriented silicon steel sheet.