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김세권,최진삼,이창국,변희국,전유진,이응호,박인용 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-
참치 뼈에서 추출한 hydroxyapatite를 출발물질로 여러 가지 세라믹 복합체를 제조하여 인공체액에서의 hydroxyapatite 복합체간의 화학결합을 조사하였다. hydroxyapatite 복합체들은 인공체액에서 4주 후부터 화학 결합성질을 나타내었다. 결합강도는 bioglass가 가장 강하게 나타났으며, 조성에 따른 의존성은 관찰할 수 없었다. 인공체액에서 복합체들은 이들의 경계면에서 불균일 핵생성 및 성장에 의해 화학적 결합으로 이루어졌다. Chemical bonding was investigated in the simulated body fluid of several selected hydroxyapatite-containing composites. The hydroxyapatite-containing composites chemically bonded with each other in the simulated body fluid after 4 weeks. Bioglass was strongly bonded in the simulated body fluid, but bonding strength was not depended on composition. Their composite bodies were chemically bonded by heterogeneous nucleation and growth at the interfaces of the specimens in the simulated body fluid.
참치뼈로 부터 추출한 천연 Hydroxyapatite 의 특성
이창국(Chang Kook Lee),최진삼(Jin Sam Choi),전유진(You Jin Jeon),변희국(Hee Guk Byun),김세권(Se Kwon Kim) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.4
For the effective utilization of the fish bone waste from seafood industry, the physical properties of the isolated hydroxyapatite from tuna bon have been investigated. On X-ray measurements, the chemical formula and phase of the bone calcined by various temperature were detected as Ca_(10)(PO₄)_6(OH)₂ and hydroxyapatite, respectively. It was shown that the chemical properties of apatite separated from tuna bone were controlled by Ca/P ratio. The mean agglomerate particle diameter was changed as a function of temperature. However, the particle shape has a geometrically non-regular types. These trends are consistent with SEM images. The composition of the bass-ceramic batch by calcined tuna bone was not perfectly agreed with the suggested data, but the partially substituted composition possibly shows the application of it as a bioceramic material.
Population Dynamics of Rice Stem Borer Under Climate Change
Hyo seok Lee,Jong-Kook Jung,Chang-Gyu Park,Man-Young Choi,Joon-Ho Lee 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Rice stem borer, Chilo suppressalis Walker is a significant rice insect pest. A newly hatched larva bores a hole into the rice stem and feeding inside. The damage results in drying and white heads of rice. Climate change will affect pest and its host population dynamics variously. In this study, the degree of asynchrony between emergence of rice stem borer and rice transplanting was examined by their phenology models. Also, correlation was examined between winter mortalities of the rice stem borer and relative humidity categorized by daily minimum temperature in 12 sites throughout the country from 1992 to 2013. The degree of asynchrony appears to be increased in future climate condition. And we found a negative correlation between winter mortality and the relative humidity. Winter mortality will be decreased in the future because of increasing winter minimum temperature and snowfall. We hypothesize that the stem borer may increasingly harbor in alternative hosts such as reed in its first generation and move to rice in the second generation. Currently the simulation study is being conducted to verify this hypothesis.
점프 수행능력 증대 훈련방법으로서의 드롭 점프의 운동역학적 특성
김창국(Kim, Chang-Kook),이영철(Lee, Young-Chul),최가람(Choi, Ga-Ram),박성진(Park, Sung-Jin),손유남(Son, You-Nam),오진석(Oh, Jin-Suk) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.70
The drop jump is a popular form of plyometric exercise often udnertaken to enhance jump height. Despite its popularity why the drop jump is superior as a training method for jumping ability than other jump styles? That is still unclear. The purpose of this study is to compare among the jumping styles; countermovement jump, drop jump, squat jump, and then to identify which one is more effective training method at aspect of overload and specificity. Motion and force data were recorded for each performance and used to compute kinematic and kinetic variables, including jump height, hip, knee and ankle angles, resultant joint force, resultant joint power, maximum GRF and a number of temporal variables. Teh average of 8 trials(n=8) for each jump styles(countermovement jump, drop jump, squat jump) was used in a series of repeated measures ANOVA. We conclude that the countermovement jump may be more effectiv ethan the drop jump and the squat jump at jump performance, that the drop jump may be more effectiveh tan the countermovement jump and the squat jump at aspect of overload for enhancing the peak propulsion during upward phase, and that the drop jump has a greater training exercise specificity to performance a quick jump performance than the others.
소화성 궤양 환자에서 Helicobacter pylori 박멸 전후의 전정부 위염 양상의 변화
김태호,이동호,김유선,이창희,송인성,정현채,김우호,김정룡,이국래,김주성,최일주 대한소화기학회 1999 대한소화기학회지 Vol.34 No.5
Background/Aims : Helicobacter pylori (H. pylori) infection and gastric adenocarcinoma are highly prevalent in Korea. Thus, it is suspected that H. pylori infection is associated with the development of gastric cancer through the process of glandular atrophy and intestinal metaplasia. We have investigated the effects of H. pylori eradication on gastric histology using updated Sydney system of gastritis. Methods: One hundred thirty-three patients with peptic ulcer associated with H. pylori infection had received H. pylori eradication therapy for 1 week (PPI based triple therapy). Then, the patients were investigated by endoscopy with gastric antral biopsy at 3 month (n=133) and 9 month (n=81) after completing eradication therapy. Results: The eradication rate was 84.9% (113/133). In H. pylori eradicated patients, the neutrophilic activity and chronic inflammation were markedly improved at 3 month (p$lt;0.05). However, the glandular atrophy and intestinal metaplasia remained unchanged until 9 months. Reinfection rate with H. pylori at 9 month was 13.6% (11/81), and most of these were suspected as recrudescent. Thus, real natural reinfection rate was thought to be much lower. Conclusions : H. pylori eradication showed no effect on the glandular atrophy and intestinal metaplasia during follow-up of 9 months.
선천성 심기형 수술 후 흉입 산화질소 중단시 발생한 반동성 폐동맥 고혈압
박희권,장영진,김지희,조영례,박정출,이현우,이경천,임유택,박국양 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.38 No.3
Background : Inhaled nitric oxide (NO) therapy causes selective pulmonary vasodilation in patients with pulmonary hypertension. However, attempts to discontinue inhaled NO may be complicated by abrupt life-threatening rebound pulmonary hypertension (RPH). The purpose of this study was to deter- mine the risk factors to develop RPH and to present the adequate weaning methods. Methods : We studied 19 consecutive children who were treated with inhaled NO because of pulmo- nary hypertension after surgery for congenital heart disease. We compared the dose of NO at the time of start and withdrawal, the duration of weaning and treatment, hemodynamic data, and blood gas analysis before inhaled nitric oxide withdrawal, between patients without (group I, n =13) and with RPH (group II, n =6). Results : Compared with group I, group II patients were older in age (1204 ± 1688 versus 546 ± 1654 days, P $lt; 0.05), had a lower NO concentration just befote withdrawal (3 ± 1.6 versus 5 ± 2.6 ppm, P $lt; 0.05), a shorter dura of NO weaning period (4 + 3.3 versus 15 + 13.4 hours, P $lt; 0.05) and received NO therapy for a shorter duration (26 ± 11.6 versus 57 ± 46.0 hours, P $lt; 0.05). Conclusions: We recommend a progressive withdrawal of inhaled nitric oxide to avoid life-threatening RPH observed in the sudden discontinuation. (Korean J Anesthesiol 2000; 38: 457~462)