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바둑판을 이용한 흑백 게임의 최적해를 구하는 선형대수학 알고리즘
이상구,박종빈,양정모,김익표 한국수학교육학회 2004 수학교육 Vol.43 No.1
For finding the optimal strategy in Blackout game which was introduced in the homepage of popular movie "Beautiful mind", we develop a mathematical proof and an algorithm with a software. We only use the concept of basis and knowledge of basic linear algebra. This process can be extended to the fullsize Go table problem and shows why we have to study mathematics at the college level.
이성호,김웅태,채광표,정덕조 建國大學校基礎科學硏究所 1988 理學論集 Vol.13 No.-
Fe₂SiO₄에 관한 X-선 회절실험과 Mossbauer 분광실험을 하였다. X-선 회절실험 결과 본 시료는 olivine group에 속하는 fayalite로서 orthorhombic 구조(??)임을 알 수 있었다. Mossbauer 분광실험은 60K-834K의 온도구간에서 행하여 졌으며, Mossbaure 스펙트럼을 분석한 결과 철은 high spin 2+ 상태임을 알 수 있었고, X-선 회절실험 결과와는 다르게 철이 산소 이온들과 함께 일그러진 octahedron을 형성하고 있음을 알 수 있었다. The Fe₂SiO₄ has been studied by means of X-ray diffractometry and Mossbauer spectroscopy. The analysis of X-ray diffraction pattern shows that Fe₂SiO₄is fayalite of orthorhombic structure(??). The Mossbauer spectra which have been taken between 60K and 834K show that the valence state of iron is ferrous and high spin state and that the iron ions occupy sites of distorted octahedron whereas the X-ray analysis shows it is at a site of regular one.
강유전체 Pb(Zr_0.5₂ Ti_0.₄8)O₃박막의 성장 및 물리적 성질
표윤숙,김두회,이장기,김상수 昌原大學校 基礎科學硏究所 2000 基礎科學硏究所論文集 Vol.12 No.-
Ferroelectric Pb(Zr0.52Ti0.48)O3(PZT) thin films coated on Si(100), SiO2/Si(100), Pt/Ti/SiO2/Si(100) and ITO/glass substrates were perpared by sol-gel processing of metal alkoxide solutions and solvents. The XRD investigation shows that the tetragonal phase of polycrystalline PZT was formed by more than four times coating of the concentrated solution and by the heat treatment over 600℃. It was found by SEM that the thin film had an average thickness of about 900Å/coating and surfaces were crack-free and uniform. Capacitance and dielectric loss (tan δ) of PZT thin film were amounted to 0~30nF and 0.05∼20 in the region of 1 kHz ∼ 10 MHz respectively. From the hysteresis loops of PZT/Pt/Ti/SiO2/Si(100) and PZT/ITO/glass thin films, a remnant polarization of 0.2573 μC/cm2, 0.1873 μC/cm2 and a coercive field of 27.78 kV/cm, 24.44 kV/cm were obtained respectively. The band gap energy, refractive index, and extinction coefficient at λ =6235Å of the PZT thin films were 3.74 eV, 1.81 and 0.048 respectively.
철서 지역에서 채집한 양서류의 중금속 오염에 관한 연구
이호원,손성원,이두표,민병윤 경남대학교 환경문제연구소 1991 환경연구 Vol.13 No.-
본 연구는 비오염 지역에서 참개구리의 성장 단계벨로 증금속의 축적 변동을 조사한 것이다. 일반적으로 올챙이 시기의 증금속 농도는 Fe > Mn > Zn > Cu > Ni > Pb > Cd,Hg의 순이었으며 성체 시기에는 Zn > Fe, Mn > Cu > Pb > Ni > Cd, Hg의 순으로 나타났다. Fe, Mn, Cu, Ni 농도는 성장이 진행됨에 따라 점차 낮아지는 경향을 보였고 Zn은 전기간을 통해 큰 변동이 없는것으로 나타났다. 대부분의 원소는 뒷다리 형성 시기에 체중 증가에 따른 농도 회석 현상이 발견 되었으며 이러한 현상은 Fe, Mn, Ni에 대하여 성체가 되는 시기에 특히 현저하였다. Heavy metal accumulations and their age-related changes were investigated in the tadpole and adult frog (Rana nigromaculata) inhabiting non-polluted area. A rank of metal concentrations was Fe > Mn > Zn > Cu > Ni > Pb > Cd. Hg in tadpole stage, and Zn > Fe, Mn > Cu > Pb > Ni > Cd, Hg in frog stage. The concentration of Fe, Mn, Cu and Ni decreased with age, and Zn concentration did not change much. A dilution effect of metal concentration by increased body weight was observed in the stage of tadpole with hind limb for most of metals, and it was marked in the stage of adult frog for Fe, Mn and Ni.
sol-gel법을 이용한 ?? 강유전체 박막의 성장과 특성
표윤숙,이장기,김상수 昌原大學校 基礎科學硏究所 1999 基礎科學硏究所論文集 Vol.11 No.-
We have developed a simple and rapid method for the synthesis of a precursor solution used in the production of ?? thin films of the layered-perovskite phase ??. Precursor solution preparation takes less than 30 min and involves the generation of two solutions : (a) Bi(O₂CMe)₃dissolved in pyridine and (b) ?? added to Sr(O₂CMe)₂and than solutbilized by HO₂CMe. After stirring separately for 10 min, these solutions are combined, stirred for an additional 10 min, and used without any further modifications. Films of the layered-perovskite phase were formed at temperatures as low as 700℃. Ferroelectric testing of SBN films, films, fired at 800℃ reveals standard hysteresis loop with no fatigue for up to 4×10 cycles.
T형 합성보의 Shear Connector 형태에 따른 전단내력 평가
이상업,표현석,김도훈,이창남,김상섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Stud connector has been used by shear connector of composite beam. Shear connector is important element to heighten composition rate of composite beam. This study based on the experiments of 15 specimens by Push-Out Test. In this paper, we analyze shear connector of other form instead of stud connector through an experimental study and wish to present application possibility to T-type Steel Composite beam.
분뇨처리장의 공정개선에 의한 처리효율 향상에 관한 연구
이찬원,김승현,김창수,문성원,전홍표,윤종섭 한국환경과학회 2004 한국환경과학회지 Vol.13 No.6
There is a need to improve the efficiency of the existing sanitary treatment facilities, because the effluent standard becomes more stricter and septic sludge increased. Thus, operating processes of sanitary treatment system in M city changed with installation of additional facilities. Process modifications were as follows: Dilution water was added to the next process after primary aeration tank. Some secondary sedimentation sludge was recycled to primary aerator so that most of the organics were stabilized in primary aeration tank under automatic control of dissolved oxygen. The line of effluent from dewatering process flowing to the activated sludge tank was changed to the primary aerator. The primary sedimentation sludge line was linked to a thickener. Polymer was added to the activated sludge tank. The effluent of primary aerator and aerobic digester was recycled from the 5th to the 1st sector. As consequencies of above process modifications, the improvement of removal efficiency was achieved as BOD 54%, COD 42%, SS 61%, T-N 39%, and T-P 12%, respectively.
이성철,전상표 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.2
It is the great necessity of mathematics in daily life. Also, importance of mathematics is more increase for our enhanced living in 21st century. But mathematics education of Korea is getting behind both quantity and quality, because many people think that mathematics is difficult and unaccessible. This paper give an mathematical interest through history of mathematics and present the Methods of mathematical education used on history of mathematics.