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배대환,정인성,배재영,김동일,Bae, Dae-Hwan,Chung, In-Seong,Bae, Jae-Young,Kim, Dong-Il 한국항해항만학회 2001 한국항해학회지 Vol.25 No.2
Along with the increase of demand of radio communications and with the rapid progress of communication systems, the radio frequency interference of neighbor nations is a matter of argue. This problem is a delicate matter which must be dealt diplomatically with by having a distinct technical back ground. After the radio interference has been experienced in the Korean TRS service on the south seashore due to the base stations including the Fukuoka station in Japan, the radio interference problem between neighbor nations has become the matter of conflict. For the purpose to solve this problem, we has measured the radio waves that come from Fukuoka in Japan mainly to Pusan in Korea and also collected data in real-time. 전파통신의 수요의 증가 및 통신시스템의 발달과 더불어, 인접 국가간의 전파간섭은 중요한 문제로 부각되고 있다. 이러한 문제는 외교적으로 미묘한 것이므로 명확한 기술적 근거를 가지고 대처해야 한다. 우리나라의 경우, 일본 후쿠오카에 위치한 기지국에 의해 남해안 TRS 서비스에 전파간섭이 발생한 후, 인접국가간의 전파간섭 문제가 중요하게 부각되었다. 따라서, 본 논문에서는 일본 후쿠오카에서 한국 부산으로 유입되는 전파를 실시간으로 측정하였다.
치관보철용 글라스 세라믹 재료에서 조성비 변화에 따른 기계적 특성에 관한 연구
정인성,김형일,박성수,최경남,안진모,박희찬 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.1
Glass ceramics for dental crown prosthesis were prepared by heat-treatment of CaO-MaO-SiO₂-P₂O -TiO₂glasses. The crystallization behaviors of samples have been investigated as a function of heat-treated temperature, holding time and chemical composition with their mechanical properties. From the experiment, the following results were obtained: The nucleation rate of apatite increased with increasing CaO or P₂O and decreasing MgO or TiO₂. Vickers hardness and bending strength of samples increased with increasing MgO or TiO₂ and decreasing CaO or P₂O. Vickers hardness of samples increased due to the precipitation of apatite, whitlockite, β-wollastonite, magnesium titanate, and diopside crystal phases within glass matrix. The final crystalline phase assemblages and the microstructures of the samples were found to be dependent on glass compositions, heat-treatment temperature, and holding time.
치관보철용 글라스 세라믹 재료에서 ZrO₂첨가에 따른 생체적합성에 관한 연구
정인성,김형일,박성수,박희찬 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.3
Glass ceramics for dental crown prosthesis were prepared by crystallization of CaO-MgO-SiO₂-P₂O5-TiO₂glasses. The crystallization behaviors of samples have been investigated as a function of heat-treated temperature, holding time and chemical composition with their mechanical properties, were studied. It was found that appropriate addition of alumina and zirconia increased the bending strength of samples. The bending strength of the sample nucleated at 775℃ for 3 h and then crystallized at 1050℃ for 2 h under vacuum followed by heat-treated at 960℃ for 3min under vacuum was approximately 406.7㎒ that was highest value among the samples. SC2Z2 glass ceramics had 4.3∼4.6×10-6/℃ thermal expansion coefficient. SC2Z2 glass ceramics held structural stability in simulated body fluid (SBF) solution.
정인성,박태원,채희창,이기형,이환성 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
A method is presented for determining the free vibration characteristics of a rotating blade having nonuniform spanwise properties and cantilever boundary condition. The equations which govern the coupled flapwise, chordwise, and torsional motion of such a blade are solved using an integration matrix method. By expressing the equation of motion in matrix notation, utilizing the integrating matrix as an operator, and applying the boundary condition, the equations are formulated into an eigenvalue problem whose solution may be determined by conventional method. Computed results are compared with experimental data.