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崔圭晃,金仁湖,崔洪守 慶尙大學校 1980 論文集 Vol.19 No.1
According to the swarm theory of the nematic liquid crystals, ware investigated the ultrasonic attenuation phenomena under the strong external condition such as the shear, thermal and electric field. The experimental results were shown to be distinguishable from the normal conditions. The periodical curve representing the attenuation in the shear field was appeared as the sine curve. It was considered that these phenomena were due to the long molecules orientation effect.
Bimodal 입도분포를 보이는 AlN 분말의 테이프캐스팅 성형을 위한 분산효과
최홍수,이상진,Choi, Hong-Soo,Lee, Sang-Jin 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
Dispersion behavior of the slurries consisted of bimodal-type AlN powders was examined in non-aqueous solvent system. Azotropic solvent system and copolymer acidic dispersant were applied to the slurries. Measurements of the sedimentation height and the viscosity of the each slurry, and the test of particle size distribution of the each powder sample were conducted as examinations for the dispersion behavior at the various dispersant contents. The bimodal-type particle size distribution was continued after addition of the dispersant and small particle portions were increased as the dispersant content increases. The density of the green sheet was also increased as the dispersant content increases and a green density of $2.114\;g/cm^3$ was obtained at the sample prepared from 2.4 wt% dispersant content. The increase of large particle portions resulted in the surface defects of the green sheets.
崔洪守 慶尙大學校 1984 論文集 Vol.23 No.2
Optical absorption, thermally stimulated luminescence(TSL) and TSL emission spectra of uv-grade single-crystal Al₂O₃have been conducted in the temperature range 77-300K. Two kinds of samples was studied. CS sample had been grown in reduced atomosphere environment and Linde sample in oxidizing environment. A typical absorption curve of CS sample exhibits a intense peak near 6.1eV. Linde sample shows a intense peak near 6eV and two weak peaks at 5.4eV and 4.8eV after neutron irradiation. Glow curves of CS sample resulting from uv irradiation at 77k exhibit maxima at 258K (thermal activation energy calculated by Initial Rise method: E=0.72eV, emission spectrum peak:410nm) and 285K(E could not be deduced). A new peak was appeared at 225K(E=0.56eV, 410nm) when bleached at 200K. From Linde crystal, a intense glow peak was observed at 285K(E=0.77eV, 320nm) and weak one at 220K(E=0.53eV, 315nm). The dependence of the intensity of glow peaks on the excitation wavelength was also examined. Experimental results suggest that the 258K and 225K peaks of CS sample are due to the thermal release of trapped electrons which recombine with existing F+ centers producing F centers in an excited state. De-excitation of these centers produces near 410nm radiation. The 285K and 220K peaks of Linde sample are attributed to the thermal release of trapped holes that recombine with electrons of the F centers converting them to excited-state F+ centers which relax to the ground state emitting near 320nm radiation.
최홍수,이수헌,김미경,곽해련,김정수,조점덕,최국선 한국식물병리학회 2010 식물병연구 Vol.16 No.1
Among the plant specimens requested from agricultural actual places of farmers, Agency of agricultural extension services and so forth for the diagnosis of plant virus diseases in 2009, the rate of crop types was 87.5% for vegetables, 4.0% for upland crops and 3.5% for orchids. In vegetables, the crops damaged severely by viral diseases were red pepper and tomato by the infection rate of 51.6% and 26.5%, orderly. Virus species occurring vegetables were 19 and the economically important viruses were Cucumber mosaic virus (CMV),Tomato spotted wilt virus (TSWV), Tomato yellow leaf curl virus (TYLCV), Pepper mild mottle virus (PMMoV)with the infection rate of 33.2%, 16.9%, 16.1% and 7.4%, respectively. Rice stripe virus (RSV) occurred at the whole areas of west coast in Korea in 2009, and its incidence was 14.2% mainly on the susceptible cultivars and yield loss was estimated up to 50%. TYLCV was spread at 34 areas of Si and/or Gun, 22 areas in 2009and 12 in 2008. Distribution of TSWV was expanded newly in 6 areas of Si and/or Gun including Gangryung,Gangwondo in 2009, and its occurrence areas were 23 Si and/or Gun after first incidence at Anyang area in 2004. Tomato bushy stunt virus (TBSV) was incited newly at Gimcheon area in 2009 with the infection rate of 65.2%, and its soil transmission rate was 55.0% in average.