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Jo, Yong Gu,Shin, Eun Joo,Lee, Young Jae,Yoon, Won Sik,Han, Sung Soo,Lee, Yang Hun,Lee, Yong Rok,Noh, Seok Kyun,Gal, Yeong Soon,Lyoo, Won Seok Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of applied polymer science Vol.113 No.3
<P>To enhance the thermal stability of poly(vinyl alcohol) (PVA) fiber, the fiber was prepared from the gel spinning of high molecular weight (HMW) PVA by using dimethyl sulfoxide/water (8/2, v/v) as a solvent, accompanied with the cross-link by boric acid (B-PVA). In addition, the structure and properties of the B-PVA fiber were compared with those of the HMW PVA fiber obtained by using the same spinning system without cross-linking (NB-PVA). Through a series of experiments, it turned out that cross-linking actualized by an optimum amount of boric acid (0.3 wt % based on PVA) and zone drawing caused significant changes in the properties of HMW PVA gel fiber. That is, cross-linking increased thermal degradation temperatures at each degradation step and amounts of final residues, resulting in improving thermal properties of the PVA fiber. On the contrary, it was found that in the case of the B-PVA fiber, some broadening of the original PVA unit cell occurred, which was identified by the peak shift to lower angle in X-ray diffractogram. The tensile strength and Young's modulus of B-PVA fiber with draw ratio of 15 are 23.1 and 308.3 g/d, respectively. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009</P>
복합운동이 중년비만여성의 신체구성, 혈중지질, 혈관탄성 및 근력에 미치는 영향
이영화,이왕록 충남대학교 체육과학연구소 2006 體育科學硏究誌 Vol.24 No.1
This study is to determine how compound exercise affects bodycomposition, blood lipid, elasticity of the blood vessel, and muscular strength of middle aged obese women. The research objects are limited to 40-50 year old middle aged women (34 of Experimental group and 25 of Control group) who have excess body fat (30%). To accommodate themselves to treadmill(trotting and jogging), exercise (HRR 40-70%, 5.5-8.5km/h, Stimes a week and 40min. each) the experimental group carries warm up & cool down :3.54.0km/h for 3to 5minutes. Muscular resistance exercise uses all 9 kinds of machinery(13-15RMx2-3set, 3 times a week, 30-40min each) 30 seconds for each event, and around 1min. of rest between each set is enforced.
Sc.thermophilus와 L. bulgaricus를 利用한 醱酵 Sausage 製造에 關한 硏究
李榮祿 건국대학교 1980 論文集 Vol.11 No.1
Studies have been conducted concerning the utilization of Sc. termophilus and L. bulgaricus which were used as lactic acid bacteria in fermented sausage. This experiment was carried out to toke advantage of lactic acid bacteria arid enhance the storage effect. The results obtained were summarized as follows. (1) PH of the control showed higher level during 50-day storage than T1; 4.8, T2; 4.75, B1; 4.8, B2; 4.8, TB1; 4.7, and TB2; 4.7. (2) The acidity of the control lot didn't show any change during storage and that of the starter culture added lot were all above 2.0%, and mixture of Sc. thermophilus and L. bulgaricus showed the digest acidity 2.44%. (3) There exist no lactic acid bacteria in control lot, added with Sc. thermophilus lot (T1) and L. bulgaricus lot (B1) during 50-day storage. Bacterial count of Sc. thermophilus added lot was 3.4 × 103/g and that of combination mixture lot (TB1), Sc. thermophilus and L. bulgaricus, was 2.5 × 103/g. TB2 showed the higst bacterial count 2.8×105/g and L. bulgaricus lot (B2) added lot (B2) showed the lowest bacterial count; 1 4×103/g, (4) Total bacterial count of control lot showed 4.3×105/g and that of starter culture added lot showed 4×105/g which is below the admittance value of law. (5) The moisture content (below 48%) of the lot showed low level, and protein (above 27%) and fat (above 20%) contents showed very high level.
대수정규 수명분포인 경우 연속적 스트레스에 의한 가속수명시험에 대한 연구
이낙영,전영록 충남대학교 자연과학연구소 1992 忠南科學硏究誌 Vol.19 No.1
The common accelerated life test(ALT) consists of test methods applying a constant stress, higher than the use condition stress, to items. There are, however, situations for which a progressive stress ALT, in which the stress on a test item is continuously increased with time, is more convenient to perform testing and simpler in analyzing data than a constant stress ALT. When a product under constant stress V follows a lognormal distribution with parameters μ(V) and σ, the life distribution of product tested under progressive stress ALT is derived. Maximum likelihood estimators of parameters involved are obtained and their asymptotic distributions are derived for the situation where the stress V(t) at time t is a linear function of t and the stress-life relationship is the inverse power law.
두경부 종양세포주에 대한 Mithramycin A의 세포자멸사 유도성 및Cisplatin 항암작용 증가효과
이강대,손성환,박종욱,김영록,이봉주,김주연 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.1
Background and Objectives : Cisplatin (CP) is a major chemotherapeutic agent for head and neck cancer. However, cancer cells can get drug resistance through recovering the DNA damage by CP. Mithramycin A (MA) can inhibit gene expression of multidrug resistance gene 1, c-myc or h-ras. The goal of this study is to evaluate the therapeutic effect of MA alone and combination of MA and CP on head and neck cancer cell lines. Materials and Methods : Two head and neck cancer cell lines (AMC-HN4, AMC-HN7) were treated with MA. The cellular proliferation, apoptosis and protein expression were measured with XTT assay, FACS analysis, and western blotting, respectively after MA treatment in cell lines. In order to know the combination effect of MA with CP, the cancer cell lines were treated with MA, CP, and MA/CP combination, and cellular proliferation, apoptosis and expression of apoptosis-associated proteins were measured. Results : MA inhibited the proliferation of head and neck cancer cells and induce dapoptosis. Increase of caspase activation, PLC-?1 fragmentation and percent apoptosis by MA treatment was blocked by z-VAD-fms, but not blocked by N-Acetyl Cystein. Combination of MA and CP significantly inhibited cancer cell growth and increased apoptosis compared to MA and CP alone, and it also suppressed the expression of anti-apoptotic proteins such as XIAP and Mcl-1. Conclusions : The present study suggests that MA alone andMA/CP combination chemotherapy could be a potential regiment for the control of the head and neck cancer.
실시간 분광 엘립소메트터를 이용한 a-Si박막의 crystallization현상 연구
오영록,최은호,이기용,방경윤,안일신,김옥경 한양대학교 이학기술연구소 2004 이학기술연구지 Vol.7 No.
실시간 측정과 in-situ 측정을 하기 위해 실시간 분광 엘립소메트터 (real-time spectroscopic rotating compensator ellipsometer) 를 제작 방법을 연구하였다. 높은 온도 에서 얻어지는 Poly-Silicon은Glass에 변형이 생기므로 저온에서의 Poly-Silicon을 만들기 위하여 ni기판에 a-Si 박막을 성장 시킨후 그위에 투명전극을 올려 300℃ 이하의 저온에서 Ni과 투명전극에 전기장을 걸어 주었을때 a-Si이 Poly-Silicon 으로 바뀌는 crystallization 현상을 직접 제작한 ellipsometer 를 이용하여 실시간으로 관찰하였다. We make real-time spectroscopic rotating compensator ellipsometer for real time measurement and in-situ measurement. We study a method to make Poly silicon after depositing amomhous silicon thin film by dc sputter system at different temperature and pressure. Amorphous silicon films of 30㎚ thickness were deposited on the Ni substrate, and then ITO films of 20㎚ thickness were deposited on the a-Si films. The sampie were crystallized below 300℃ in the electric field applied between the Ni and ITO.