비정질 Fe_(90-x)Ni_(x)Zr_(10)(x=5, 10) 금속의 구조분석

李凞福,宋寅命,柳志旭,李春雨 公州大學校 基礎科學硏究所 1993 自然科學硏究 Vol.2 No.-

X-선 회절상을 분석하여 비정질 fe90-x NixZr10 (x=5,10) 금속의 구조를 구하였다. X-선 회절상은 2θ가 20˚ 근방과 35˚ 근방에서 전형적인 비정질 금속의 halo상을 나타냈으며, 구조인자와 원자분포함수의 각 peak는 비대칭성을 나타내어 액체금속과는 다른 구조를 보였다. 계산된 동경분포함수(RDF)의 각 peak들은 인접원자들의 분포를 나타내는 것으로서 Gaussian 함수형태를 나타내었으며, 이들을 Gaussian 함수로 각각 fitting하여 구조에 관한 변수들을 구하였다. Fe80 Ni10 Zr10의 구조분석 결과 최인접 원자배위수는 13.2이 었고, 최인접 원자간 평균거리 r0는 2.60Å, 인접원자들의 분포폭을 나타내는 Gaussian 함수의 변수 δr은 0.35Å이었다. 또한 Fe85 Ni5 Zr10의 최인접 원자배위수는 13.8이 었으며, r0는 2.62Å, δr은 0.35Å, 이었다. 본 시료의 δr은 일반적인 비정질 금속들의 값보다 훨씬 크게 나타났다. X-ray diffraction patterns of amorphous fe90-x NixZr10 (x=5,10) alloys were analyzed to obtain the structural information. The X-ray diffraction pattern of the amorphous alloys consists of typical halo-patterns at diffraction angles near 2θ = 20˚ and 35˚. And the structure factor and the atomic distribution function have unsymmetrical peaks differed from those of liquid metals. The structural parameters representing the atomic distributions of near-neighbors were obtained by Gaussian fittings to the peaks of the radial distribution function (RDF). From these parameters the estimated coordination numbers were 13.2 and 13.8, the mean distances between nearest neighbor atoms r0 were 2.60Å and 2.62Å, and the Gaussian parameters δr indicating the range of nearest atomic distribution were broth 0.35 Å for amorphous Fe80 Ni10 Zr10 and Fe85 Ni5 Zr10 alloys, respectively. The parameters δr of the amorphous allays turn out to be much larger than those of typical amorphous alloys.

벼 이앙기를 이용한 보리 어린모 이식에 관한 연구

이춘우,백성범,손영구 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.1

보리 파종 시기에 잦은 강우로 인하여 토양이 과습하여 보리 파종기계의 정상적인 작동이 어려워 파종을 하지 못하는 경우가 많이 있다. 토양이 과습한 경우에도 보리 파종을 하기 위하여 벼 이식기를 이용하여 보리 어린모 이식 가능성을 검토하기 위하여 2002년에는 작물시험장 수원시험포에서 시험한 결과는 아래와 같다. 가. 육묘일수는 3~6일이 좋았고 9일은 너무 자라 기계이식이 잘되지 않았다. 나. 이식율은 높이기 위하여 이식 전 경운하는 것이 좋았으나 월동율이 낮아지는 단점이 있었다. 다. 벼 이앙기를 사용하여 이식하므로 보리는 식물체가 연약하며 보리 어린모가 절단되고, 결주가 발생하는 문제점이 있었다. 라. 이식시 물이 없으므로 이앙기가 가라 앉지 않으므로 이식심도가 낮아져 어린 모의 활착율이 낮고 월동율이 낮았다. 마. 이식시 이식율이 낮고 월동율이 낮아 수수확보가 어려워 수량성이 낮았다. 바. 어린묘 육묘의 가능성을 검토하였으나 위에서와 같은 여러가지 문제점으로 인하여 보리 어린모 이식은 가능성은 낮은 것으로 사료되었다. Heavy rain during the seeding season of barley, poses a lot of problems such as wet soil stuck to the barley seeder making it difficult to use the machine, The cultivation area of barley is dependent on the weather conditions during the seeding time. Usually, during the rainy weather, the area of cultivation is decreased. Since the soil moisture is high during the rainy weather, the ordinary seeding method does not work efficiently, thus, there is a need for a new seeding method. This study was conducted to examine the possibility of using a rice transplanter in transplanting barley seedlings. Before the seedling was transplanted, plowing than non-plowing was increased to improve the rate of transplanting success. The barley seedling was first cut and set in shallow depth using the rice transplanter. To ensure success in transplanting, the wintering rate was decreased. These factors however reduced the number of panicle and yield. The study showed that using the rice-seedling box for barley is possible. However, transplanting the infant barley using the rice transplanter is impossible due to low transplanting rate and wintering.

다공질규소 microcavity의 페브리-페로 필터 특성

이춘우,박대규,홍사용,김영유,전종현 公州大學校 基礎科學硏究所 1999 自然科學硏究 Vol.8 No.-

p형 단결정규소 웨이퍼를 15% HF-에탄올 용액에서 양극 산화시켜 다공질규소를 얻는 과정에서 전류밀도에 따라 굴절률이 변하는 다층의 다공질규소층(porous silicon multilayer)을 구현하였다. 그리고 다층의 다공질규소층(I), 다공질규소 발광층, 또 다른 다층의 다공질규소층(II)의 순으로 구성된 porous silicon microcavity(PSM)를 제작하고 그 물성을 조사하였다. PSM 상하에 위치한 다층의 다공질규소층의 단면을 AFM(Atomic Force Microscope)으로 조사한 결과 고굴절률과 저굴절률이 주기적으로 교차하는 층이 균일하게 형성되었으며, 중앙의 다공질규소 발광층도 균일하게 나타났다. 다층의 다공질규소층 및 다공질규소 발광층의 두께를 각각 실효파장의 1/4배 및 2배가 되도록 하였을 때 특정파장의 필터로 쓰일 수 있는 페브리-페로 간섭 필터(Fabry-Perot interference filter)의 특성이 나타났다. 또한 PSM의 발광 스펙트럼은 그 반치폭이 현저히 감소하고 발광의 세기가 크게 증가되는 경향을 보였다. 또한 발광파장을 600 nm로 조절하여 PSM을 구현하고 발광 특성을 관찰한 결과 600 nm 부근에서도 같은 현상이 일어나 발광의 최대 봉우리 파장값을 이동시킬 수 있는 필터로서의 역할이 가능함을 보였다. In the process of obtaining porous silicon by anodizing p-type doped crystalline silicon wafer in 15 % HF-ethanol solution, we obtained porous silicon multilayers which had periodically varying refractive index by the current density. We fabricated the porous silicon microcavity(PSM) which consist of porous silicon multilayers(I), active layer of porous silicon and porous silicon multilayers(II) and investigated its physical properties. The AFM(Atomic Force Microscope) measurement from the cross section of multilayers I and II) shows uniformity of high refractive index and low index layers as well as the active layer. We observed the characteristics of Fabry-Perot interference filter when the thickness of layers was 1/4 and the thickness of active layer was twice of the effective wavelength, which can be used as a filter for specific wavelength. We found the emission characteristic from the PSM, which FWHM(Full Width Half Maximum) was considerably decreased and emission intensity was increased. And as a result of fabricating PSM which consisted of 600 nm in the light emission wavelength and observing the light emission properties, We found out that there was the same phenomenon in 600 nm wavelength and PSM could act as a filter which could shift the maximum of the emitted light.

골수이식 후 골밀도 및 골대사의 변화 : 2년 추적관찰 2-Year Prospective Study

이원영,강무일,오은숙,오기원,한제호,손현식,윤건호,차봉연,이광우,손호영,강성구,신완식,민우성,김춘추 대한내분비학회 2000 Endocrinology and metabolism Vol.15 No.4·5

董氏鍼의 頸項痛 治療에 관한 臨床的 考察

이채우,조태성,박인범,김상우,안창범,송춘호,윤현민,장경전 대한침구학회 2003 대한침구의학회지 Vol.20 No.2

Objective : The purpose of this study was to evidence the effect of Dong-Shi Acupuncture by improving degree of forty four patients who have received a Dong-Shi Acupuncture therapy at Dong Eui oriental hospital OPD and chiefly complained for neck pain and related symptoms. Materials and Methods: Forty four patients were diagnosed with physical inspection and readiography, and investigated into the effect of treatment sharing before treatment and after 2 weeks and 4 weeks treatment by Dr. Kim's method. Results and Conclusions: The conclusion of this study was that improving degree of forty four patients who have received a Dong-Shi acupuncture therapy for all items and excellence of the Dong-Shi Acupuncture was evidenced.

트레이 자동 투입기 설계 및 개발에 관한 연구

이춘만,신성우 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

A tray inserting machine is developed for automation of inserting plastic mold tray into a cardboard box. Plastic mold tray is used for protecting breakage of glass bottles. In this paper, two types of processes to divide the plastic mold tray are proposed. As a result, adhesion method by vacuum pad is accepted. And, static and modal analysis for the machine are also carried out to check the machine design using the commercial software, CATIA V5.

中學生의 科學과 科學敎育에 대한 認識調査

李春雨,朴敬哲 공주대학교 사범대학 과학교육연구소 1990 과학교육연구 Vol.22 No.1

The purpose of this paper is to collect the basic data to develop the middle school students understanding about science and science education. The data for this study are based on a written questionaire. After dividing the collected questionaire by school year and sex distinction, frequency and percentage was investigated. And also, χ relation(likeness) test was used in this study to tell the difference of understanding according to school year and sex destinction. The findings of this surdy are as follows: 1. Most students think that 1) science is a study which researches the world of materials theoretically. 2) science is developed by consistent research and observation. 3) science knowledge is must be proved by an experiment and that there are many ways in explaining the natural phenomena 4) science and scientists not only influence the development of human culture, but also contribute to it. 2. Most student think they have to learn science because it must be developed in order to develop techniques. 3. The students think highly of science and scientists` contribution to the development of human civilization. 4. The students not only think that science is most important, but also are interested in making an experiment and research work. But in reality the students negatively about having a job related to science of being a scientist in the future. The reason for such response is basically caused by the teachers` teaching methods which are focused on teaching the scientific knowledge in science lesson, and by teachers` carelessness dealing with scientific problems. 5. Based on the findings and analyses of the study, the following things can be concluded. (1) The students think that the aims of science is to think scientifically and to improve the ability to solve the problems creatively. (2) The students think that science education is very important. But they show little interest in studying science and find it too difficult. (3) The reasons of studying science turns our as follows: Firstly, to improve the spirit of inquiry and the ability of solving problems. Secondly, because society ban be developed only when science is developed beforehand. Thirdly, to get some more science knowledge. Fourthly, to enter an high school. (4) Most students want laboratory-centered science lesson.

師範大學 敎育課程 模型의 開發에 關한 硏究(Ⅰ) : 物理 및 地球科學 敎育課程을 中心으로 With Reference th Physics and Earth Science

李春雨,禹榮均,李華永 공주대학교 사범대학 과학교육연구소 1983 과학교육연구 Vol.15 No.1

One of the major objectives of this study is to arrange the curricula of the rhysics and the earth science course in the teachers college for improving the academic preparation of secondary school science teachers. To accomplish the objectives, the writers have preferentially analyzed the new science curriculum of the middle school and that of the physics and the earth science of the high school, and also the curricula of the physics and the earth science of the teachers college which will be applied in the pilot curriculum of the teachers college. The new science education may be characterized (1) operationally by an anal-ysis of the practician's activities, (2) intellectually by its constructs, (3) method-ologically by the mode of inquiry and procedures for problem solving. Science is the process which makes knowledge and is the interconnected se-ries of concepts and conceptual schemes that have developed as a result of experi-mentation and observations. and are fruitful of further experimentation and obser-vations. The problems set up in the analysis, in detail, are educational objectives, the contents of subject matter, the method of instruction, management of curriculum. The new and tentative curricula of the physics and the earth science in the teachers college is rearranged on the basis of both theoretical foundation and re-sults analyzed. And the new curricula of the physics and the earth science is organized on the basis of 150 credits, and also intensively, systematically, and logically. And the teaching contents of the physics and the earth science education is desirable to consist of higher level and new topics centering around the contents of secondary school science curriculum. And additionally, some of the followings concerned with the implementation of the curricular construction are suggested as the betterment. (1) Now, on-going 140 credits completion essential for the degree of B. A. for the students enrolled at the national teacher's colleges across the nation, should be strongly trengthened up to 150 credits with a view to covering the present bleak in educational achievement for producing more competent secondary school teachers, which can be said fittable for the imminent, prime objective of our teacher's colleges. (2) This study suggests the model of more reasonable curricular construction, and its actual way of implementation, which is based on the supposed 150 cred-its-completion system, which will be a help to the colleges of 140 credits-basis in curricular activities, by adding or rearranging the necessary number of courses for graduation. (3) The system, which the credits for the minor majors can be taken during the period of school vacation in addition to the regular 150 credits is safely said more desirable. Meanwhile, in the actual conducting of the above like-wise curricular activi-ties, it is supposed to be more desirable that both the choice of concerned depart-ments of the physics and the earth science and those regulations of the col-legesconcerned and ministry of education are expected to be justified in accord-ance with each other for more educational fruit-bearing, so, the more active, and long-range study and suggestions for the betterment should be activated hereafter, with no stop, for the development of our scientific education and building up our national strength itself.

Copper billet열간압출의 정상상태 유한요소해석에 관한 연구

이춘만,전병우 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-

This study is concerned with a study on steady-state finite element analysis of hot extrusion for copper billet. The design of extrusion dies is still an art rather than science. Die design for a new extrusion is developed from through in-plant trials. In the present paper, axisymmetric steady-state finite element simulation program is developed. Steady-state assumption is used for both the analyses of deformation and temperature. The developed program is effectively used to simulate two cases of extrusion processes. Distributions of temperature, effective strain rate, mean strain rate and mean stress are studied for an effective design of an extrusion die.

InSb 박막의 제작과 홀 이동도 특성

이우선,손경춘 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1

Magnetic Characteristics of InSb hall device of multilayerd structures were investigated. For the measurement of electrical properties of hall device, evaporated InSb thin film fabricated with series and parallel multilayers. According to variation of magnetic field measured hall coefficient, Hall mobility, carrier density and hall voltage. We found that the XRD analysis of InSb thin film showed good properties at 200℃, 60 minutes. Resistance of ohmic contact increased linearly due to increasing current. Some of device fabrication technique and analysis of magnetic characteristics were discussed.