각막난시와 전체난시에 관한 연구

成德鏞 대구산업정보대학 1997 논문집 Vol.11 No.2

In this study, total astigmatism and corneal astigmatism were studied in 328 eyes of healthy Koreans for astigmatism. Total astigmatism was measured by fogging-and-dial technique, and corneal astimatism was measured with Magnon keratometer. Residual astigmatism was determined by a discrepancy between total and corneal astigmatism. The results were as follows : As they aged, there were statistically significant changes in total and corneal astigmatism but not in residual astigmatism. And the amount of with-the-rule total and corneal astimatism had a tendency to decrease, but residual astimatism had no changes. From 30 years, total astimatism showed a tendency to become against the rule. The average diopteric value was +0.342D in total astimatism, +0.920D in corneal astimatism and -0.579D in residual astimatism.

허혈성 심질환에서 나타나는 황상화지수, 사이토카인 및 염증지표의 변화

전상훈,안지훈,방덕원,온영근,현민수,김성구,권영주 순천향대학교 의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.3

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Au를 공침한 SnO₂후막센서의 가스 감응 특성

성정훈,강대원,이윤수,임준우,홍영호,이덕동 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

High selective and sensitive thick film type methane gas sensors were fabricated and their sensing characteristics for various hydrocarbon gases were investigated. Raw material, SnO_(2)/Au, prepared by coprecipitation was even grain size. SEM, TEM, BET and XRD analyses were carried out for investigation of surface morphology and crystalline structure. The thick film devices using the above materials exhibited high sensitivity to methane gas at the operating temperature of 400°C. The sensitivity of SnO_(2)/Au+Pd thick film devices to methane gas was higher than that to the other hydrocarbon gases such as iso-butane and propane. The optimal adding amounts of Au and Pd were 1wt.% and 3wt.%, respectively. The sensitivity, S, is defined as {(R_(A)-R_(G))/R_(A)}><100, which R_(A) and R_(G) are resistance in air and that in the gas ambient, respectively.

스포츠와 정치에 관한 이론적 고찰

성영호,이석영,노덕선,권지윤 龍仁大學校 體育科學硏究所 1997 體育科學硏究論叢 Vol.7 No.1

An attempt of indicating al perspective for the systematic arrangement of studies on sports and politics was made examining the contents and method of preceding studies conies concerned. Main results are as follow; 1. The concrete domains of the study on sports and politics are classified into such five categories as sports policy sports and political ideology, political functions of sports, sports and social regime, and sports international relations. After indicating the problems to be solved in terms of the systematic arrangement of the studies in each category, they are mutually related and a guideline for the systematization of studies on sports and politics is presented. 2. Politics can basically be understood as policy which has a certain logical relation with public interests and power, for the analysis of mutual relation between sports and politics standing on the basic of policy it is inevitable to clarify the meaning of in fluence relation and function Especially logical improvement of the method of functional analysis is indispensable.

Angiotensin Ⅱ로 유도된 혈관신생에 대한 日川芎의 억제효과

文成一,金亨煥,趙貞姬,安德均,崔湖榮 대한본초학회 2002 大韓本草學會誌 Vol.17 No.2

Objective : To estimate the angiogenic effect of water extract of Cnidii Rhizoma (ECR), we employed the rat sponge model for angiogenesis. Methods : It was based on subcutaneous implantation of sterile polyester sponges in the SD rat and we have characterized the dye method that incorporates 5% carmine red and 1% cresyl violet in 10% gelatin. vascularity index (V.I.) expressed as ㎍ dye/mg tissue. Subcutaneous implantation of sterile polyester sponges in SD rats enhanced the neovascularization over 14 days, as determined by measurements of relative sponge blood flow by a vascularity technique. The angiogenic response was verified by histological evaluation of vascularized sponges. Results : Daily oral administration of ECR (100 mg/kg for 14 days) produce no apparent effect on angiogenesis. The vasoconstrictor peptide, angiotensin Ⅱ (AⅡ), in daily doses of 100 nmol, caused an intense neovascularization but lower doses of AⅡ produced no apparent effect (1 nmol and 10 nmol). Co-administration of 100 nmol AⅡ and 100 mg/kg ECR p.o. depressed 100 nmol AⅡ-induced angiogenic effect. Conclusion : We have shown that p.o. daministration of 100 nmol AⅡ accelerated angiogenesis. Meanwhile, co-administration of 100 nmol AⅡ and 100 mg/kg ECR highly suppressed angiogenic property.

철골구조의 고층건물에서 가새의 효율성에 관한 연구

김근덕,김상식 연세대학교 산업기술연구소 1981 논문집 Vol.13 No.2

This research is associated with the analysis of the behavior of bracings in steel framed structures and with the derivation of the approximate method for it. The behavior of bracings in steel frames has been investigated numerically by comparing the lateral deflection of braced frames to that of unbraced frames for lateral loads. An approximate method for moment-connected frames has been derived considering the moment equillbrium equation at node and the axial stiffness of the bracings under the assumption of slab diaphragm action. Rayleigh-Ritz's variational method has been adopted to derive the approximate method for the shear-connected frames. The calculated results by these methods show good matches with the computed values by SAP IV computer program. The approximate methods presented in this paper evaluate the effectiveness of bracings in steel frames explicitely, and can satisfactorily be used in the preliminary structural design of braced steel frames.

재광화 완충용액의 pH 변화가 상아질의 재광화에 미치는 영향

김성철,노병덕,정일영,이찬영 대한치과보존학회 2007 Restorative Dentistry & Endodontics Vol.32 No.2

치아 우식증은 구강 영역에서 가장 흔한 질환이나 여러 가지 복잡한 요소가 작용하기 때문에 이에 대한 발생기전과 치료법에 대해서는 완전히 이해되지 않은 상태이다. 특히 초기우식의 재광화에 있어서 pH의 영향에 대하여 논란의 여지가 있다. 본 연구에서는 유산 완충용액을 이용하여 상아질에 인공 우식을 형성하고 이때의 무기질 소실을 측정하고, 탈회된 시편을 pH가 다른 세가지 재광화 용액 (pH 4.3, 5.0, 5.5 군)으로 재광화시켰을 때 나타나는 무기질의 침착되는 양과 침착이 일어나는 부위를 Microradiograph를 이용하여 정량적으로 비교 분석하였다. 또한 주사전자현미경을 이용하여 수산화인회석 결정의 정상 상태, 탈회된 상태, 그리고 재광화가 일어났을 때의 상태를 정성적으로 비교하여 다음과 같은 결과를 얻었다. 1. Microradiograph 분석시 pH가 증가할수록 탈회된 상아질에서 재광화양이 유의차 있게 증가되는 경향을 보였고, pH가 낮아질수록 재광화가 일어나면서 더 깊게 탈회되는 양상을 보였으나, pH 5.5 군은 전반적으로 재광화가 일어나는 경향을 보였다 (p < 0.05). 2. 주사전자현미경 소견에서 상아질 우식의 재광화는, 유기기질 망을 둘러싸고 있는 수산화인회석 결정의 표면으로부터 진행되며 결국에는 탈회 시 파괴된 공간을 채워가는 양상으로 관찰되었다. 3. 재광화 5일 후 pH 4.3, 5.0 군에서 무기질이 침착되어 수산화인회석결정이 정상보다 커졌으며, pH 5.5 군에서 재광화된 부위의 결정은 정상으로 회복되는 양상을 보였다. 재광화 10일 후 pH 4.3, 5.0 군에서 재광화 5일 후에 정상보다 커졌던 결정들이 정상상아질의 결정 크기로 줄어들었으며 pH 5.5 군에서는 결정의 크기가 2 배정도 커진 경우도 관찰되었다. 본 실험의 결과에 의하면 상아질의 우식과 재광화 과정은 단순한 탈회와 재광화의 독립적인 과정이 아니고 동력학적으로 탈회와 재광화가 동시에 일어나는 과정이며, 이때 재광화는 기존의 수산화인회석 결정의 표면으로부터 진행되었다. Dental caries is the most common disease in the oral cavity. However, the mechanism and treatment of dental caries is not completely understood since many complex factors are involved. Especially the effect of pH on remineralization of early stage of dental caries is still controversial. In this study, dental caries in dentin was induced by using lactic acidulated buffering solutions and the loss of inorganic substance was measured. Also decalcified specimens were remineralized by three groups of solution with different pH (group of pH 4.3, 5.0, and 5.5). Then, the amount and the area of inorganic substance precipitation was quantitatively analyzed with microradiograph. Also a qualitative comparison of the normal phase, the demineralized phase, and the remineralized phase of hydroxyapatite crystal was made under SEM. The results were as follows; 1. In microradiograghic analysis, as the pH increased, the amount of remineralization in decalcified dentin tended to increase significantly. As the pH decreaced, deeper decalcification, however, occurred along with remineralization. The group of pH 5.5 had a tendency to be remineralized without demineralization (p < 0.05). 2. In SEM view, the remineralization in dentine caries occurred from the hydroxyapatite crystal surface surrounding the mesh of organic matrix, and eventually filled up the demineralized area. 3. 5 days after remineralization, hydroxyapatite crystal grew bigger with deposition of inorganic substance in pH 4.3 and 5.0 group, and the crystal in the remineralized area appeared to return to normal. After 10 days, the crystals in group of pH 4.3 and 5.0, which grew bigger after 5 days of remineralization, turned back to their normal size, but in group of pH 5.5, some crystals were found to double their size. In according to the results of this experiment, the decalcifying and remineralizing process of dentine is neither simple nor independent, but a dynamic process in which decalcification and remineralization occur simultaneously. The remineralization process occurred from the hydroxyapatite crystal surface.

소뇌 출혈을 동반한 침입성 부비동 아스페르길루스증 1예

양현덕,박성욱,손일홍,이지용,석승한,조광호,이성수 圓光大學校 醫科學硏究所 2003 圓光醫科學 Vol.18 No.2

스포츠 활동 참가가 중·고등학생의 자아 개념에 미치는 영향

박상덕,이향숙 창원대학교 체육과학연구소 2004 경남 체육연구 Vol.9 No.1

본 연구는 스포츠 활동 참가가 중·고등학생의 자아 개념에 미치는 영향을 규명하는데 그 목적을 두고 중·고등학생의 개인적 특성, 스포츠 활동 참가 유무, 스포츠 활동 참가 정도 등이 중·고등학생의 자아 개념에 미치는 영향을 분석하였다. 진주시, 창원시, 마산시에 있는 중·고등학교 학생 568명을 표집 하였으며, 수집된 자료를 바탕으로 상관분석, 공변량분석 및 중다회귀분석을 하였다. 그 결과 다음과 같은 결론을 얻었다. 첫째, 스포츠 활동 참가와 중·고등학생의 자아 개념 관련 변인간에는 유의한 상관관계가 있었다. 즉, 중·고등학생의 개인적 특성 변인 중 성(性)이 스포츠 활동 참가 유무에 영향을 미치고, 스포츠 활동 참가 유무는 자아 개념에 유의한 영향을 주었다. 둘째, 스포츠 활동 참가 유무는 중·고등학생의 자아 개념에 영향을 주었다. 즉, 스포츠 활동에 참가하는 중·고등학생이 비참가 중·고등학생 보다 자아 개념이 높이 나타났다. 셋째, 스포츠 활동 참가 정도는 중·고등학생의 자아 개념에 영향을 주었다. 즉, 스포츠 활동 참가 기간이 길고 빈도가 많은 중·고등학생일수록 자아 개념이 높게 나타났다.

Saururus Chinensis의 지방산 및 아미노산의 성분 연구

鄭悳商 제주대학교 1992 논문집 Vol.35 No.-

The fatty acids and amino acids in Saururus chinensis, native to Korea, were isolated and identified by gas chromatograph using glass capillary column and amino acid analyzer. Thirteen fatty acids and seventeen amino acids were identified.