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이의완,곽호원 경북대학교 과학교육연구소 1997 科學敎育硏究誌 Vol.21 No.-
The new educational program was used to educate the elementary school students about the energy saving. Our educational program about the energy saving was made by analysing the contents related to the energy in the text and regrouping them into a unified form. The effectiveness is increased from 63.8% (using the present text)to 88.5%(using our program). The presence of 84.8% in students is known to realize the various methods about saving the energy from our program.(73.3% from the present text) Consequently, our program is proved to be more effective in educating the energy saving than the present text.
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液晶의 Cholesteric Blue Phase에 관한 光學的 硏究
李義完 慶北大學校 1985 論文集 Vol.39 No.-
The blue phases B_1 and B_2 in the mixture of cholesteric and nematic materials have been studied using optical Bragg reflection. It is found that in a TM59/E5(95 : 5) mixture two phases coexist in the B_2 phase. A critical choleteric pitch at which the crossover from discontinuous to continuous behavior of the lattice parameter(B_1-B_2 transition) takes place has been found at 400㎚. Above this critical value, the shorter B_2 phase lattice vanishes.
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이의완,곽호원,이상우 경북대학교 과학교육연구소 1994 科學敎育硏究誌 Vol.18 No.-
We selected 17 kinds required experimental subjects according to analysis of content of the experiment in the 7 sorts of physics textbook being used at the high school, and made the assessment's standard table of the group and the individual. And we used those subjects as the method of assessment in order to increase reasonably the accomplishment of learning goal. As the result of that, experimenting behaviors turned into more active and the role of individual was made concrete. Therefore students had more interest in the experiment. Consequentely, students understood better not only the learning of the experiment but also the contents of the textbooks through the comprehension of the learning of the experiment and the improvement of ability of research.
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李義完 慶北大學校 1989 論文集 Vol.47 No.-
The formation of Ni-silicides on Si(111) surface was investigated by RHEED (Reflection High Energy Electron Diffraction)-AES (Auger Electron Spcetroscopy) system. The background pressure of this system was less than 2×10 exp (-9) torr throughout the experiments. The cleanning of the sample surface was accomplished by repeated heating up to 1200℃ with flowing DC current directly through the sample. After heating extremely clean Si(111) 7×7 superstucture was obtained. Pure Ni atoms were slowly deposited on Si(111) clean surface by thermal evaporation at room tempeature. After thermal treatment of the sample, the stuctures and the compositional depth profiles were analysed by RHEED and AES Ar ion sputtering respectively. It was found that the Ni-Si silicide phase was formed at 350℃ and that of NiSi at 450℃ by AES analysis. Also the RHEED pattern for the final stage of Ni-silicide was 1×1 structure.
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Li이 吸着된 실리콘 表面의 超構造變化와 離脫 에너지 測定
李義完 慶北大學校 1989 論文集 Vol.48 No.-
At the surfaces there are many important phenomena such as oxidation, adsorption, desorption, corrosion, and friction because it is the place where the materials interact with the environment at first. The semiconductor surfaces generally make reconstructions to minimize the total energy of the system. Among many semiconductors the Si(111) surface has been known as it posesses various kinds of reconstructed surface structures and phases. When the metal atoms are adsorbed on Si(111) surface, the reconstructed superstructure phase transition is drastical according to the both substrate temperature and the thickness of adsorbed metal films. These adsorbed systems are almost solved by recent decade studies. Alkali-metal adsorption of solid surfaces has been the intense objects. In this paper Li desorption processes on Si surface and superstructure change according to the alkali-metal deposition were investigated by using RHEED-AES system.
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이의완,김구화,임종수 韓國非破壞檢査學會 1996 한국비파괴검사학회지 Vol.16 No.3
본 연구는 강편 빌레트의 표면 결함을 검출하기 위한 건식 자분 탐상에 관한 것으로 자분 탐상능을 대상체에 흘리는 자화 전류, 대상체의 온도, 자분의 총 분사량 등에 대하여 평가하였다. 선재 제품의 등급에 따라 필요로 하는 몇까지 강종을 선택하여 강종별 자기적 특성을 평가하였으며, 이를 입력자료로 하여 유한 요소법에 의한 자기 해석을 행하였고, 그 결과를 직류 자화 전류에 의한 누설 자속 측정 결과와 비교 분석하였다. 교류 자화 전류에 의한 건식 자분 탐상능을 직류 자화 전류에 의한 탐상능과 비교하여 강종 및 자화 전류의 유형에 따른 자화 전류치를 결정하였다. 직류 자화 전류에 의한 자분 탐상 결과를 유한 요소법에 의한 계산과 비교하였고, 빌레트의 표면과 표면 결함 부위에서 측정한 누설 자속으로 비교 결과를 평가하였다. 각 강편재의 경우 직류 자화 전류에 의한 표면 자장은 그 형상에 의한 영향으로 코너 부위에서는 면 중앙의 표면 자장치에 비해 30% 정도였으며, 교류 자화 전류에 의해서는 그 비율이 70%정도였다. 교류 자화 전류는 코너로부터 면중앙으로 10mm 되는 영역을 제외하고는 전 면에서 균일한 표면 자장을 발생하엿다. 대상체의 온도에 따른 자분의 흡착은 대상체의 온도 150℃까지는 큰 변화가 없으나 자분의 고착에 있어서 60℃ 이상의 고온재에 대해서는 융착 용매로 메틸렌 크로라이드를 사용하는 것이 부적합하였다. 자분의 총분사량은 자분 탐상능에 상당히 큰 영향을 미침을 확인하였고 이에 대한 정량적 평가를 행하였다. Dry magnetic particle inspection(MPI) was performed to detect the surface defects of steel ingot cast billets. Magnetic properties of several materials were characterized by the measurement of the B-H hysteresis curve. The inspection results were evaluated in terms of the magnetizing current, temperature, and the amount of magnetic particles applied to billets. Magnetic flux leakage near the defect site of interest was measured and with the results of calculation by the finite element method in the case of direct magnetizing current. Direct and alternating magnetizing currents for materials were deduced by the comparison of the inspections. Results of the magnetic particle inspection by direct magnetizing current were compared with those of finite element method calculations, which were verified by measuring magnetic leakage flux above the surface and the surface defects of the material. For square rods, due to the geometrical effect, the magnetic flux density at the edges along the length of the rods was about 30% of that at the center of rod face for a sufficiently large direct magnetizing current, while it was about 70% for an alternating magnetizing current. Thus, an alternating magnetizing current generates rather uniform magnetic flux density over the rods, except for the region on the face across about 10 mm from the edge. The attraction of the magnetic particle by the magnetic leakage field was nearly independent of the surface temperature of the billets up to 150℃. However, the temperature should have been limited below 60℃ for an effective fixing of gathered magnetic particles to the billet surface using methylene chloride. We also found that the amount of applied magnetic particles tremendously affected the detection capability.
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