• 원예과학기술지
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• 제28권3호
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• pp.353-362
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• 2010

비닐하우스의 낮은 pH 토양(pH6.2)과 노지의 높은 pH 토양(pH7.6) 의 pH 차이가 배추 품질에 미치는 영향을 알아보기 위하여 13종 배추의 기능성 성분과 영양성분을 분석하였다. 낮은 pH 토양에서 재배된 배추는 높은 pH 토양에서 재배된 배추에 비하여 펙틴, 조단백질, 비타민 C, 비타민 E의 함량이 현저히 높았으며 회분과 무기질(Ca, Fe, Na, Mn) 또한 높았다. 그러나 환원당, 셀룰로오스, 조지방의 함량은 낮은 pH 토양의 배추가 높은 pH 토양의 것 보다 40-50% 낮았다. 글루코시놀레이트의 일종인 gluconasturtiin(18.33 vs. $1.16nmol{\cdot}g^{-1}$ wet weight)과 gluconapin(145 vs. $2nmol{\cdot}g^{-1}$ wet weight) 은 높은 pH 토양의 배추에서 낮은 pH 것보다 의미 있게 높았다. 본 연구 결과 낮은 pH 토양에서 재배된 배추는 펙틴의 함량이 높고 셀룰로오스의 함량이 낮아 조직감이 좋으며 단백질, Ca, Fe, vitamin C와 E의 함량이 높아 영양성분이 향상 되었으나 높은 pH 토양에서 재배된 배추는 환원당과 글루코시놀레이트의 함량이 많아 맛과 항암성은 높음을 알 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제28권3호
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• pp.386-390
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• 2007

By use of a simple two-point extrapolation scheme estimating the correlation energies of the molecules along with the basis sets specifically targeted for extrapolation, we have shown that the MP2 basis set limit binding energies of large hydrogen-bonded complexes can be accurately predicted with relatively small amount of computational cost. The basis sets employed for computation and extrapolation consist of the smallest correlation consistent basis set cc-pVDZ and another basis set made of the cc-pVDZ set plus highest angular momentum polarization functions from the cc-pVTZ set, both of which were then augmented by diffuse functions centered on the heavy atoms except hydrogen in the complex. The correlation energy extrapolation formula takes the (X+1)-3 form with X corresponding to 2.0 for the cc-pVDZ set and 2.3 for the other basis set. The estimated MP2 basis set limit binding energies for water hexamer, hydrogen fluoride pentamer, alaninewater, phenol-water, and guanine-cytosine base pair complexes of nucleic acid by this method are 45.2(45.9), 36.1(37.5), 10.9(10.7), 7.1(6.9), and 27.6(27.7) kcal/mol, respectively, with the values in parentheses representing the reference basis set limit values. A comparison with the DFT results by B3LYP method clearly manifests the effectiveness and accuracy of this method in the study of large hydrogen-bonded complexes.

• Fibers and Polymers
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• 제6권2호
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• pp.95-102
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• 2005

Sodium cellulose carbonate (CC-Na) dissolved in $8.5\;wt\%$ NaOH/ZnO (100/2-3, w/w) aqueous solution was spun into some acidic coagulant systems. Diameter of regenerated cellulose fibers obtained was in the range of $15-50\;{\mu}m$. Serrated or circular cross sectional views were obtained by controlling salt concentration or acidity in the acid/salt/water coagulant systems. Velocity ratio of take-up to spinning was controlled up to 4/1 with increasing spinning velocity from 5 to 40 m/min. Skin structure of was developed at lower acidity or higher concentration of coagulants. Fineness, tenacity and elongation of the regenerated cellulose fibers were in the range of 1.5-27 denier, 1.2-2.2 g/d, and $8-11.3\;\%$, respectively. All of CC-Na and cellulose fibers spun from CC-Na exhibited cellulose II crystalline structure. Crystallinity index was increased with increasing take-up speed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.832_833
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• 2009

본 연구는 과거에 개발 되었었던 보조 선로 리액터를 구비한 초전도 한류기에 대한 것이다. 과거의 연구에서는 BSCCO선재와 YBCO coated condcutor (YBCO CC) 선재를 사용하여 실험적으로 한류특성에 대하서 연구 하였다 [1]. BSCCO 선재는 유도형으로 권선되어 정상 시에 저항은 작지만 인덕턴스 성분이 존재하는 보조 선로 리액터의 역할을 수행하였고 YBCO CC 선재는 무유도형으로 권선되어 스위치의 역할을 수행하였다. 두 개의 권선은 병렬로 연결되어 정상 시에는 전류가 YBCO CC 선재로 통전되다가 사고가 발생하면 YBCO CC 선재의 저항으로 인해서 BSCCO 선재로 통전되는 형태로 동작하였다. 본 연구에서는 BSCCO 선재의 보조 선로 리액터 부분을 초전도체가 아니라 일반 상전도체를 적용하여 스위치와 보조 선로 리액터의 조합에 변화를 주면서 한류 특성에 대한 시뮬레이션을 수행하였다.

• 한국세라믹학회지
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• 제21권2호
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• pp.156-164
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• 1984

The characteristic of pyrolytic carbon deposited in a fluidized bed as measured by density apparent crystallite size and viewed metallographically under polarized light can be easily controlled by adjusting the deposition parameters such as deposition temperature and propane flow rate or silicon content. The density of isotopic pyrolytic carbons deposited from propane between 120$0^{\circ}C$ and 140$0^{\circ}C$ increases with increasing propane flow rate and decreasing deposition temperature from 1, 73g/cc to 2.08g/cc. The apparent crystallite size Lc parameter appears to depend only on deposition temperature being entirely independent of the propane flow rate. The carbon matrix density of the silicon-alloyed carbonds deposited from propane and methyltrichlorosil-ane from 2.05g/cc for a silicon content around 9wt% to 2.67g/cc for a silicon content of 36.7wt% The Lc parameter of the deposition temperature being entirely independent of the silicon content.

• 한국의학물리학회지:의학물리
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• 제20권4호
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• pp.191-198
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• 2009

이 연구의 목적은 소조사면 선량계측을 위하여 엣지검출기의 성능을 평가하기 위함이다. 다양한 소조사면과 깊이에서 엣지검출기(Model 1118 Edge)를 이용하여 6 MV 광자선의 선량 직선성, 선량률 의존도, 출력 계수, 선량 측면도 및 심부선량 백분율을 따라 측정하였으며, 이를 표준용적의 이온전리함(CC13)과 광자선 다이오드 검출기(PFD)와 비교하였다. 선량 직선성을 일차 선형 맞춤 함수와 비교하였을 때, 세 검출기 모두 1% 미만의 차이를 나타냈으며, 엣지검출기는 -0.08~0.08%의 가장 낮은 차이를 보였다. 선량율의 변화(100~600 MU/min)에 따라 PFD와 엣지검출기의 정규화된 반응비는 1% 미만의 일정한 값을 보였으나, CC13은 100 MU/min에서 약 -5%의 변화를 나타냈다. 조사면의 크기($4{\times}4\;cm^2{\sim}10{\times}10\;cm^2$)에 따른 출력계수는 세 검출기 모두 거의 같은 값을 보였으나, $4{\times}4\;cm^2$ 이하의 소조사면에서는 엣지검출기와 PFD의 출력 계수가 CC13과 최대 21%의 차이보였다. 각 조사면에서 20~80%의 반음영 폭을 측정하였을 때, 평균적으로 CC13은 엣지검출기보다 2배, PFD는 약 30% 정도 더 넓게 나타났다. 또한 10~90%의 반음영의 경우, CC13과 PFD가 각각 55%와 19% 정도 더 넓은 폭을 나타냈다. 엣지검출기는 선량 측면도의 반치폭이 조사면의 크기와 거의 일치하였으나, 다른 두 검출기는 조사면의 크기보다 약 8~10% 더 크게 나타났으며, 심부선량백분율은 각 조사면에서 세 검출기 모두 거의 일치하였다. 엣지검출기의 성능평가를 위한 선량특성을 분석한 결과, $4{\times}4\;cm^2$ 이하의 소조사면에서 가장 적합한 특성을 나타냈으며, CC13과 PFD와 같은 검출기는 조사면이 작을수록 상당한 오차를 나타낼 수 있음을 알 수 있었다.

• Journal of Microbiology and Biotechnology
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• 제24권6호
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• pp.803-811
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• 2014

Concerns over drug-resistant bacteria have stimulated interest in developing alternative methods to control bacterial infections. Endolysin, a phage-encoded enzyme that breaks down bacterial peptidoglycan at the terminal stage of the phage reproduction cycle, is reported to be effective for the control of bacterial pathogenic bacteria. Bioinformatic analysis of the SPN9CC bacteriophage genome revealed a gene that encodes an endolysin with a domain structure similar to those of the endolysins produced by the P1 and P22 coliphages. The SPN9CC endolysin was purified with a C-terminal oligo-histidine tag. The endolysin was relatively stable and active over a broad temperature range (from $24^{\circ}C$ to $65^{\circ}C$). It showed maximal activity at $50^{\circ}C$, and its optimum pH range was from pH 7.5 to 8.5. The SPN9CC endolysin showed antimicrobial activity against only gram-negative bacteria and functioned by cutting the glycosidic bond of peptidoglycan. Interestingly, the SPN9CC endolysin could lyse intact gram-negative bacteria in the absence of EDTA as an outer membrane permeabilizer. The exogenous lytic activity of the SPN9CC endolysin makes it a potential therapeutic agent against gram-negative bacteria.

• 감성과학
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• 제5권1호
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• pp.25-32
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• 2002

본 연구에서는 7가지 실크직물의 스치는 소리를 녹음한 후, 색채로 변환시켜 변환색채에 대한 감각과 감성을 평가하고, 2차원 모형을 제시하여 감각/감성과 직물의 관계를 시각화하였다. 피험자 30명을 대상으로 변환색채에 대한 감각과 감성을 평가하도록 하였으며 색채의 물리량은 홍색비율(RP), 녹색비율(GP), 청색비율(BP)과 색채 빈도수(CC)를 계산하였다. 감성차원에 대하여 활동감, 우아함, 터프함의 세 요인이 도출되었다. 활동감 차원은 GP, CC와는 정적인 상관을 보였으며 능직물과 견방사의 교직물을 가장 활동적이라고 평가하였다 우아함 차원은 RP와는 정적상관을, CC와는 부적상관을 보였으며 수자직물과 평직물이 가장 우아하다고 평가되었다. 터프함 차원은 RP와 높은 정적상관을 가졌다. 능직물과 같이 색채 빈도수가 많고 홍색비율과 녹색비율이 많은 변환색채를 선호하였다.

• 한국산업보건학회지
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• 제19권3호
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• pp.307-320
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• 2009

This study was conducted not only to review airborne asbestos levels reported in workplaces in Korea, but also to analyze their levels according to various characteristics All asbestos concentration reported as either geometric mean (GM) and geometric standard deviation (GSD) or ranges were transformed to arithmetic mean to estimate exposure level. In addition, weighted arithmetic means (WAMs) were calculated to weigh asbestos levels based on the different number of samples. Differences of asbestos levels among several characteristics such as industry type, decade, operation and sampling and analytical methods were analyzed using analysis of variance (ANOVA). The number of articles studying asbestos levels from workplaces was found to be 9 including two report types. Five of those were reported prior to 1990s and rest of them after 1990s. Only several industries such as asbestos textile, asbestos cement, brake-lining repair shops were studied, while various industries using asbestos or asbestos containing materials (ACMs) were not studied. ANOVA found that asbestos exposure levels (WAM = 5.26f/cc) reported from textile industry were significantly higher than those from other industries (cement = 0.63f/cc, brake-lining = 0.2f/cc - 0.47f/cc) (p < 0.0001). Average exposure levels studied prior to the 1990s (3.13f/cc) were found to be significantly higher than that (0.86f/cc) after the 1990s (p<0.0001). All WAMs reported until the 1994 were found to be higher than the current occupational exposure limits (0.1f/cc). This study recommends that retrospective exposure to asbestos based on various industry types and operations should be assessed.

• 한국임상약학회지
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• 제26권1호
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• pp.53-58
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• 2016

Objective: To estimate the association between ABCG2 C421A polymorphism and response to imatinib in chronic myeloid leukemia. Methods: A systematic review was conducted to evaluate the effect of ABCG2 C421A polymorphism on imatinib response. The databases of PubMed, Embase, Web of science, CINAHL with FullText, and Cochrane Library were searched for all published studies from inception to December 2015. The following terms were used with functions of 'AND' and 'OR': 'chronic myeloid leukemia', 'CML', 'drug transporter', 'ABCG2', 'BCRP', 'polymorphisms', 'SNPs', and 'imatinib'. The studies reporting the association between ABCG2 polymorphism and imatinib response were evaluated. Results: A total of 7 studies were included in the present meta-analysis. The pooled analysis showed that ABCG2 c.421CC genotype was significantly associated with poor response to imatinib under the dominant model (CC vs CA+AA; OR: 0.56; 95% CI: 0.41, 0.77; p = 0.0004). The subgroup analysis of Asian studies demonstrated a significantly lower response in c.421CC genotype than in c.421CA or c.421AA genotype (OR: 0.52; 95% CI: 0.37, 0.73; p = 0.0002). In subgroup analyses of 5 studies, the patients with the c.421CC genotype exhibited higher risk for worse response than the patients with c.421CA or c.421AA genotype (heterozygote codominant model: CC vs. AC; OR: 0.49, 95% CI: 0.33, 0.73; p = 0.0006; homozygote codominant model: CC vs AA; OR: 0.43; 95% CI: 0.25, 0.75, p = 0.003). Conclusion: The ABCG2 c.421CC genotype was significantly associated with poor response to imatinib compared to the c.421CA and c.421AA genotypes in chronic myeloid leukemia, especially in Asian patients.