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A Direction-Finding Antenna Inserted into the Surface of Cylindrical Conductor Body
김재식 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.4
In this letter, a direction-finding (DF) antenna inserted into the surface of a cylindrical conductor body, with the conductor material in front of the antenna, is presented. To minimize a gain reduction in the axis direction of the cylindrical conductor, an aperture of an openended waveguide antenna is modified, and the conductor body is deformed. The antenna is operated at the X-band, and its direction finding performance using an amplitude comparison method is analyzed. To verify the validation of the performance of the antenna, the analyzed results are compared to the measurement results.
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김재식 한국산업식품공학회 2014 산업 식품공학 Vol.18 No.1
Grape seed tea (GST) was prepared by roasting grape seed at 150-190oC for 10-60 minutes and then soaking inwater at 100oC for 20 minutes. GSTs made with grape seed with an L value of 19.5-20.5 were the best in termsof color, flavor, and sensory test. GSTs prepared using roasted grape seeds had higher total phenolics and antioxidantactivity than GST prepared from raw grape seed. Roasting times to reach an L value of 19.5-20.5 were over60 minutes at 160oC, 40-50 minutes at 170oC, 30-40 minutes at 180oC, and below 10 minutes at 190oC. In a sensorytest, the total preference increased depending on the degree of roasting. GSTs with the highest preference used grapeseed roasted at 170oC and 180oC for 30 minutes.
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H3BO3와 SnO 첨가에 따른 0.6TiTe3O8-0.4MgTiO3 세라믹스의 마이크로파 유전특성
김재식,최의선,이문기,류기원,이영희 대한전기학회 2005 전기학회논문지C Vol.54 No.4(C)
In this study, the microwave dielectric properties of 0.6TiTe3O8-0.4MgTiO3 ceramic with H3BO3 and SnO were investigated to reduce the sintering time for the LTCC application. According to the X-ray diffraction patterns, both of 0.6TiTe3O8-0.4MgTiO3 ceramic with H3BO3 and SnO had the columbite structure of TiTe3O8 phase, the ilmenite structure of MgTiO3 phase. The density and dielectric constant of the 0.6TiTe3O8-0.4MgTiO3 ceramics with H3BO3 sintered at 830℃ for 1 hour were decreased but the quality factor was not changed with addition of H3BO3. Also the temperature coefficient of resonant frequency was not changed hardly. In the case of addition of SnO, the density and dielectric constant were increased but the quality factor was decreased and the temperature coefficient of resonant frequency was shifted to the negative(-) direction.
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김재식,김정문,김정식 전북대학교 부설 휴양및경관계획연구소 2007 휴양및경관연구 (J East Asian Landscape Studies) Vol.1 No.1
The purpose of this study is to create the cultural landscape we can realize the flavor of our ancestors from, improving and maintainning the Museong Seoweon in chilbomyun, jeongup city. This plan containing the confliction between protection of cultural properties and developing the around area promotes synthetic maintenance which can let out their own characters and make them be in accord with environment. I hope that the Museong Seowon where people enshrine some of the greatest ancestors such as Choichiwon, who was the greatest scholar in shila dynasty a thousand years ago and Junggeukin, who is famous for sangchungok will be given a new look as a central and cultural facility which can succeed the tradition of Honam region.
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