교사들의 공통과학 실험 · 실습 선호도 조사 분석

정원우,이윤종,강용희,윤일희,이우붕,손종경,김중욱,강동진,권용주 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

The purpose of this study is to investigate the status of the experimental and practical education in high school general science. The present status and reasonable management of the experimental and practical education in high school general science were evaluated by the questionaires. To do this, 146 science teachers in Korea are administered questionaires. The frequency of the experimental and practical items in the seven kind of general science text books were investigated. The problems and the reasonable management for experimental and practical education were proposed in this paper.

CdS:In 單結晶의 基本特性과 photosensor로의 應用

강현식,박병채,장성우,이해익,최용대 全北大學校 敎育大學院 1986 敎育論叢 Vol.6 No.-

The opto-electrical properties of the CdS : In single crystals were studied by these means of the scanning electron microscope, X-ray diffraction, optical transmission & photoconductivity, resitivity variation v.s. impurites, and resitivity v.s. photon flux change. By X-ray diffraction measurement, the structure was found to be hexagonal and the lattice constant was calculated to be a_o=4.13Å and c_o=6.75Å The band gap was estimated to be about 2,419eV (300K). By the transmission measure ments a donor impurity level of In or Al was 0.024eV below the conduction level edge. For the application on the photosensor, the resistivity(ρ) variation of the CdS : In was measured with respect to photon flux(P_o) change and to wavelength, the resistivity was found to be ρ=8.75×10^6P_o^-125 (Ω―㎝/Lux) and the photoconductivity showed its highest response peak between 5,000Å and 5,400Å ranges.

한국의 한 농촌 지역에 거주하는 노인에서의 치매의 유병률

우종인,이정희,유근영,홍진표,김창엽,김용익,이강욱 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.1

본 연구는 한국의 농촌지역인 경기도 연천군에 거주하는 65세 이상 노인인구를 대상으로 치매의 유병률을 산정하였다. 선별검사로서 MMSE-K를 실시한 후 NINCDS-ADRDA 기준에 따라 치매의 임상 진단을 확정하였고, 치매의 정도는 DSM-Ⅲ-R 기준에 의하여 평가하여 다음과 같은 결과를 얻었다. 1) 치매의 유병률은 9.5%로 추산되었으며, 알쯔하이머병과 혈관성 치매의 유병률은 각각 4.5%와 2.5%이었다. 2) 치매의 유병률은 연령증가에 따라 증가하는 소견을 보였으며, 성별차이는 알쯔하이머병의 경우 여자에서 유병률이 더 높았으나 혈관성 치매는 남자에서 더 높았다. 3) 치매의 정도에 따른 유병률은 경도의 치매는 6.2%, 중등도 및 중증 치매가 3.3%이었다. 이상의 결과에서 본 연구는 한국에서의 치매의 유병률 양상이 종래의 북미나 유럽에서와 유사하고, 중국이나 일본 등 다른 아시아권의 국가에서와는 차이를 보이는 소견을 나타냈다. The authors investigated the prevalence and risk factors of dementia among 1,674 elderly residents in Yonchon county of Kyonggi-do, a rural area of Korea who were above 65 years of age, in 1993. The primary screening was done with MMSE-K(Korean version of Mini-mental State Examination), and the final diagnoses of dementia for 436 subjects were made by NINCDS-ADRDA criteria. The prevalence of total dementia was 9.5%, and it increased with advancing age. Particularly, it rapidly increased in the elderly above 75 years of age. The prevalence of dementia in female as a whole was higher than in male, but this was not shown in each age group. The prevalences of Alzheimer's disease and vascular dementia were 4.5% and 2.5%, respectively. Assessing the degree of dementia with DSM-Ⅲ-R criteria, the prevalence of moderate and severe dementia was 3.3%. Our result showed the similar finding to the prevalence of dementia in western countries, but was different from those of the previous studies in other Asian countries, China and Japan.

世界平和와 韓國의 役割

姜永晧,李瑛雨,金宇泰 경북대학교 법정대학 1976 法大論叢 Vol.14 No.-

World peace is an ideal which mankind has been searching for a long time. The League of Nations and the United Nations, established after World War Ⅰ and Ⅱ respecetively, were the results of the desire of peace-loving people attempting to solve international disputes and conflicts by peaceful means. Following the end of World War Ⅱ through 1950's the world has experienced a period of Cold War, replaced by an era of peaceful co-existence during 1960's. In 1970's the thaw in the struggle among big powers developed which further lessened the likelihood of war among the super powers. Taking advantage of improving international atmosphere, however, north Korean Communists have disguised themselves as the champion of peace and offered many so-called "peaceful unification formulas", thus misleading the world opinion. It is the objective of this paper to correct the misinformation concerning the problem of peace in Korea and to reveal true motive of the north Korean Communists by clarifying ROK's position on the issue of peaceful unification of the Korean Peninsula. Chapter Ⅰ is an introduction to this paper stating the problems and issues to be discussed in the paper. Chapter Ⅱ deals with putting Korean people's view of peace on the basis of the world peace by making clear the true idea of peace through historical development of peace theory in western history and searching the types of the world peace. Chapter Ⅲ is a study of peaceful nature of Korean people from the perspectives of Korean history. In order to make an effective analysis on above issue the Chapter is divided into three parts: first, a brief examination of the origin of Korean race; second, a study of Korean history based on mythology such as "Hong-Ik In-Gan" philosophy found in Dan-Gun myth and "So-Do" philosophy prevelant during the period of Three Hans; third, a historical recollection of numerous invasions of the Korean Peninsula by foreigners and yet the fact that at no time had Korea invaded its neighboring countries. Chapter Ⅳ deals with a period since the second World War, and particulary since the establishment of the Republic of Korea in 1948, in which the Korean Government, inheriting the spirit of peaceful nature of its people, has been pursuing peace. The Chapter is divided into two parts. The first deals with the period up to 1970 during which the R.O.K. was established (in 1948), the Korean War was erupted (in 1950), and the normalization of relations between Kore and Japan was achieved (in 1965). Internally, political stability and economic growth were realized in order to establish a firm base for an eventual peaceful unification of the Peninsula. Externally, this period saw the Republic of Korea expanding its diplomatic activities by establishing multilateral relationship with foreign countries. Since the beginning of the 1970's. President Park Chung Hee has universally published a series of epock-making plans to settle peace on the Korean Peninsula. President Park's August 15 Declaration (1970), a south-north joint communigue´ (1972), the declaration of a new foreign policy for peace and peaceful unification (1973), the proposal of non=aggression pact between the south and north (1974), and the proposal of three basic principles for peaceful unification (1974)-these are the expressions of the R.O.K.'s efforts to settle peace on the Peninsula and to contribute actively to the world peace. By studying the contribution of Korea to the world peace, it is hoped that the efforts by the Korean Government by clearly understood and this article would contribute in a small way toward the eventual unification of the Korean Penininsula.

Simvastatin이 골결손부 회복에 미치는 영향

강정호,김규태,최용석,이현우,황의환 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.3

Purpose : To observe and evaluate the effects of Simvastatin-induced osteogenesis on the wound healing of defective bone. Materials and Methods : 64 defective bones were created in the parietal bone of 32 New Zealand White rabbits. The defects were grafted with collagen matrix carriers mixed with Simvastatin solution in the experimental group of 16 rabbits and with collagen matrix carriers mixed with water in the controlled group. The rabbits were terminated at an interval of 3, 5, 7, and 9 days, 2, 4, 6, and 8 weeks after the formation of defective bone. The wound healing was evaluated by soft X-ray radiography. The tissues within defective bones were evaluated through the analysis of flow cytometry for the manifestation of Runx2 and Osteocalcin, and observed histopathologically by using H-E stain and Masson’s trichrome stain. Results : 1. In the experimental group, flow cytometry revealed more manifestation of Runx2 at 5, 7, and 9 days and Osteocalcin at 2 weeks than in the controlled groups, but there was few difference in comparison with the controlled group. 2. In the experimental group, flow cytometry revealed considerably more cells and erythrocytes at 5, 7, and 9 days in comparison with the controlled group. 3. In the experimental group, soft x-ray radiography revealed the extended formation of trabeculation at 2, 4, 6, and 8 weeks. 4. Histopathological features of the experimental group showed more fibroblasts and newly formed vessels at 5 and 7 days, and the formation of osteoid tissues at 9 days, and the newly formed trabeculations at 4 and 6 weeks. Conclusion : As the induced osteogenesis by Simvastatin, there was few contrast of the manifestation between Runx2 and Osteocalcin based on the differentiation of osteoblasts. But it was considered that the more formation of cells and erythrocytes depending on newly formed vessels in the experimental group obviously had an effect on the bone regeneration.

단순 스무딩 스플라인 함수 추정

강상길,이우동,윤용화,김종태 慶山大學校 基礎科學硏究所 1998 基礎科學 Vol.2 No.1

본 논문의 목적은 선형 스무딩 스플라인에 대한 단순하고 구체화된 형태를 제안하고, 구체화된 선형 스무딩 스플라인 형태를 통하여 스무딩 스플라인의 특성을 이해하고는 어떻게 비모수 함수 추정량의 도구로서 사용될 수 있는지를 보인다. 또한 예제를 통하여 다른 비모수적 추정량들과 비교하였다. In this paper, we give simple and closed form of linear smoothing spline. Through the form, we understand the characteristics of smoothing spline, and show that how the smoothing spline can be used as a tool for estimator of nonparametric functin. And an example is given for comparison of our esttimator with another nonparametric estimators.

배 농가의 경영효율성 분석 : 비모수적 접근방법에 의한 사례연구 A case study using non-parametric method

우수곤,유진채,강경하,신용광 한국농촌지도학회 2002 농촌지도와 개발 Vol.9 No.2

The objective of this study was to compare the farm efficiency of members of cooperative firms with that of non-members in Korea. Data were collected from 27 farms members of three cooperatives and 13 non-member farms, based on the managerial achievements of 1999. For the analysis, the data were divided into three different farming types: type I and Ⅱ of member farms and non-member farms. Economic analysis were implemented using DEA(Data Envelopment Analysis). Major findings was as follows. Total average technology efficiency was 0.782, which implies that there still remains 21.8% of improvement possibility. Among the time types, type I showed the highest technology efficiency of 0.9055, while " 11 and non-member farms showed 0.7670 and 0.7171, respectively. This means that these farms have relatively high potential improved. Also, comparing technology efficiency by dividing into pure technology and scale efficiency, all type of the farms exhibit a higher pure technology efficiency compared to scale efficiency. Therefore, to improve current technology efficiency, farms need to focus more on pure technology efficiency improvement. Meanwhile, profit analysis based on farm size indicate that most of the farms demonstrated the increasing-return-to-scale, which means it is necessary to extend the farm size to improve technical efficiency. Type I member farms achieve higher profit and efficiency than other two types and relatively higher producer prices through introducing cooperative sorting, grading and packing. Also, these labor saving technologies increased farm size.

Modal SI 기법 적용을 위한 최적 측정위치 선택

강태우,권순정,김용현,신수봉 東亞大學校 建設技術硏究所 2001 硏究論文集 Vol.25 No.2

In applying a modal system identification with a limited number of measuring degrees of freedom, the selection of optimal sensor locations (OSL) is critical for a good identification. The current research proposes a new OSL method applicable to a modal system identification (SI) and compares it with a widely used OSL method. The proposed method utilizes the sensitivity of eigenvectors with respect to the structural parameters. A simulation study for a tower structure has been carried out to demonstrate the efficiency of the proposed method. Through the simulation study, the influence of OSL on the structural parameters estimated by a S1 method are investigated.

化學反應蒸着에 의한 CdS 多結晶 薄膜制作 및 그 特性硏究 (Ⅰ)

강현식,남궁윤,최선우,홍광준,최용대 全北大學校 敎育大學院 1986 敎育論叢 Vol.6 No.-

CdS thin film was fabricated by chemical bath deposition method and polycrystallined by the proper heat treatment. The physical properties of the amorphous and polycrystal of CdS thin film were observed and calculated by measuring the X-ray diffraction patterns, optical absorption, transmission and photoconductivity. From the present experiments, we obtained the energy band gap of the CdS polycrystal thin film to be 2.42eV and the In donor impurity level to be 0.025 eV below the conduction band : Another result was to be a_o=4.13Å and c_o=6.75Å for lattice constants of the hexagonal structure. Also, we attempted it to find the possibility of the application to photosensor. To apply cds this film to the photosensor more sufficiently, further experiments are required to accumulate data on such problems.

천추 전방에서 발생한 신경절 세포종 : 증례 보고 A Case Report

강현구,이승로,박동우,박충기,함창곡,박용욱 한양대학교 의과대학 2002 한양의대 학술지 Vol.22 No.2

We have experienced a case of presacral ganglioneuroma. So, we report a peripheral ganglioneuroma of sacral origin. The patient is 34-year-old man with intermittent low back pain and right sciatica. Myelographic computed tomography revealed extradural lobulated low attenuated tumor lesion within spinal canal at the level of L5 and S1. Tumor indented the thecal sac to the left side, and extended into the pelvic cavity through the intervertebral foramen between S1 and S2. The mass was surgically excised and turned out to be ganglioneuroma pathologically.