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박종하,김재곤,백병주,허선,이영수 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3
본병원 소아치과에 내원한 유치와 영구치 모두에 법량질 형성 부전증을 가지고 있는 환자에 대해 교합면의 마모를 방지하여 교합고경을 유지하기 위해 유구치부 stainless steel crown 및 맹출 중인 제 1대구치에 sealant, 전치아에 걸쳐서 주기적인 불소도포를 이용해 치료하여 양호한 결과를 얻었다. Amelogenesis imperfcta is a group of hereditary defects of enamel unassociated with any other generalized defects. The prevalence of this condition has been estimated to range from l in 14.000 to l in 16.000. depending on the population sudied. It may be differentiated into three general types: hypoplastic, hypocalcified. and hypomaturation. depending on the clinical presentation of defects and the likely stage of enamel formation that is primarily affected. The dentin and root are usually normal. but the enamel may lack the normal prismatic structure, being laminated throughout its thickness or at the periphery, with the result that these teeth are more resistant to decay. This case is that of an six-year-old girl brought to the pediatric dentistry department by her parents for esthetic reasons and also because of slight dental sensitivity. Clinical and radiographic examinations confirmed amelogenesis imperfecta. The author has treated with the crowning of the primary molars, using prefomed NICr crowns and periodic and periodic fluoride application on whole dentition.
한국인의 실내 라돈-222 자핵종 피폭으로 인한 초과 폐암위험
장시영,하정우,이병헌 대한방사선 방어학회 1992 방사선방어학회지 Vol.17 No.1
실내 라돈-222 자핵종의 농도에 피폭되므로서 유발될 수 있는 한국인의 초과 폐암위험을 방사선피폭의 확률론적 위험예측 모형을 이용하여 정량적으로 평가하였다. 1989년 기준 표준 생명표와 사망원인 통계연보 자료로부터 유도한 한국인의 폐암 사망률은 남, 여별로 각각 22.4/10 5-년 및 9.5/10 5-년으로 추정되었다. 이 폐암 사망률을 근거로 수학적으로 예상한 모든 사망원인하의 기저 폐암사망위험은 남, 여별로 각각 0.047(4.7%) 및 0.019(1.9%)로 1984년 미국의 0.067(6.7%) 및 0.025(2.5%)보다 낮았다. 방사선 피폭의 확률론적 수정 상대위험 예측모형을 사용하여 예상한 한국인의 라돈자핵종 피폭당의 초과 폐암위험 계수는 남자;0.022/WLM, 여자;0.009/WLM 및 평균;0.017/WLM로 나타났으며 이로부터 추정한 한국인의 평균 수명중 라돈자핵종 피폭유발 초과 폐암의 사망빈도는 230/10 6인-WLM으로 최근 외국의 관련연구에서 보고한 120~450/10 6- WLM의 거의 중간치(median)정도에 해당하는 것으로 평가되었다. An excess risk of lung cancer mortality among Koreans, attributable to indoor ²²²Rn daughters exposure, were quantitatively evaluated by applying a stochastic health risk projection model on the radiation exposure. The lung cancer rate in Korean males and females, based on the 1989 demographic data, were estimated to be 22.4/10 5-y and 9.5/10 5-y, respectively. The lifetime baseline lung cancer risks, deduced from these rates, appeared to be 0.047 and 0.019 for males and females, respectively, and were lower than the corresponding 1984 values of 0.067 and 0.025 in the U.S.A. The excess risk coefficients, derived by modified relative risk projection model of the BEIR-IV Committee under the US National Academy of Science, per annual 1.0 WLM of exposure to indoor radon daughters were estimated to be 0.022/WLM for males, 0.009/WLM for females, and 0.017/WLM for both sexes. The resulting annual frequency of excess lung cancer mortality for the life expectancy in the Korean population appeared to be 230/10 6-WLM, which was an approximate median of 120~450/10 6-WLM reported so far in the world.
CR-39 라돈컵을 이용한 국산 건축자재의 라돈-222 방출율 측정
장시영,하정우,이병훈 대한방사선 방어학회 1991 방사선방어학회지 Vol.16 No.1
CR-39 플라스틱 핵비적검출기를 라돈검출기로 내장한 멤브레인 필터컵(일명 : CR-39 라돈컵)을 이용하여 일부 국산건축자재의 라돈방출율을 측정하였다. 표준라듐선원을 이용한 라돈컵의 교정실험을 수행하여 얻은 CR-39 검출기의 라돈검출인자는 0.164±0.005(??)였으며 타 연구자들의 발표결과와 잘 일치하였다. 일부 건축자재(모래벽돌, 적벽돌, 화강석판, 콘크리트 덩어리, 건물바닥과 내벽)에 CR-39 라돈컵을 2개월 동안 기밀 부착하여 라돈방출율을 측정한 결과, 라돈방출율은 모래벽돌에서 평균 ??, 화강석판에서 ??로 10배 정도의 차이를 보였으며, 모래벽돌>콘크리트바닥>콘크리트덩어리>건물벽>적벽돌>화강석판의 순서를 보였다. 본 연구결과, CR-39 라돈컵에 의해서도 건축자재의 라돈방출율을 효과적으로 측정할 수 있음이 입증하였다. Radon-222 exhalation rate from several domestic building materials were experimentally measured by using radon cup method, in which a CR-39 plastic is used as a passive radon detector. The radon detection factor of CR-39 detector determined in a series of calibration experiments was 0.164±0.005(??), which is consistent with those reported by other investigators. The radon exhalation rates of several building materials (brick, red brick, concrete block, granite plate, concrete floor and wall) ranges from ??(granite plate) to ??(brick) with the increasing order of granite plate, red brick, concrete wall, concrete block, concrete floor and brick. It showed that the CR-39 radon cup can be efficiently utilized in measuring the radon-222 gas exhalation rate from building materials.
Si Young Ha,Ji Young Jung,Jae Kyung Yang 경상대학교 농업생명과학연구원 2023 농업생명과학연구 Vol.57 No.3
Cordyceps militaris (C. militaris) is a unique and valuable medicinal fungus belonging to the Cordyceps species. C. militaris is the only fungus that contains cordycepin which is a biologically active compound. In previous studies, light-emitting diodes (LEDs) are known to be effective in increasing cordycepin content, but metabolic profiling of LED-stimulated C. militaris has not been confirmed. Metabolic profiling is essential to understanding the metabolic regulation of cordycepin. This study studied the physiologically active secondary metabolites of C. militaris according to the presence or absence of stimulation of LEDs through GC-MS analysis. Most of the metabolites were detected in both samples, but there was a clear difference in the detected concentration. In particular, C. militaris had a significant difference in amino acid levels when stimulated with LEDs. Our results suggested that LEDs could stimulate amino acid synthesis in C. militaris mycelium to increase the cordycepin content.
Effect of physicochemical pretreatment on ethanol production from reed (Phragmites australis)
Si Young Ha,Ji-Su Kim,Ji Young Jung,Jae-Kyung Yang 한국산림바이오에너지학회 2019 산림바이오에너지 Vol.29 No.1
In this study, physical and chemical pretreatments were compared in terms of their enhancements in biomass enzymatic saccharification in reed. Steam explosion treatment results in 60.8% glucose conversion. In comparison, 1% H₂O₂ treatment along with steam explosion is a relatively low-cost biomass conversion method with glucose conversion at 80%. Sequential 1% H₂O₂ pretreatment with steam-exploded residues resulted in the highest ethanol yield at 16% with an almost complete sugar-ethanol conversion rate. Because of lower amount of non-cellulosic polymers (ligning, hemicelluloses) that increase the biomass surface, steam-exploded residues were specifically effective for 1% H₂O₂ either to block lignin absorption with cellulases or to disassociate hemicelluloses, leading to efficient enzymatic lignocellulose digestion. To our knowledge, this study provides three more applicable approaches for high ethanol production with relatively low cost, less contaminant release, and efficient biomass conversion rates in reed compared to previously reported pre-treatments in other C4-grasses (Miscanthus, corn, sweet sorghum, switchgrass).