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안광환(Kwang-Hwan An),신봉섭(Bong-Sup Sin),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.1
This paper presents an UHF-band conformal and small discone antenna suitable for communication between an aircraft and a ground station. The proposed antenna consists of a cone, an upper disk, a lower disk, a metallic cavity and a radome. The discone is installed inside a cavity to minimize the effects to structures around the antenna. Electromagnetic absorbing material is applied to the side wall of the cavity to reduce the effects to the cavity side wall. After greatly reducing the height of a conventional discone antenna, the antenna diameter is reduced by placing two disks above the cone. Starting from a prototype structure, the antenna is optimally designed on the basis of parametric analyses. The optimally designed antenna has a diameter of 500mm(0.75 wavelength at the center frequency) and a height of 62.5mm(0.093 wavelength). Measurements of the fabricated antenna show that the proposed antenna has a maximum gain of 0dBi in the elevation direction and .1.2dBi in the azimuth direction, and a reflection coefficient of less than .10dB over 0.43-0.47GHz.
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김경필(Kyung-Phil Kim),안광환(Kwang-Hwan An) 충남대학교 농업과학연구소 2012 농업과학연구 Vol.39 No.2
The purpose of this study is to provide basic information on exporter’s coordination methods from the attitude of agro-food exporters. The implications are; Firstly, most of exporters believe that the agro-food export raises farmer’s competitiveness rather than it does the farmhouse’s income increase. Secondly, The stabilization of the farm-gain income by exporting agricultural products are most important in order to reinforce the cohesion between farmers and exporters. Thirdly, the exporters intend to participate in establishing and operating a large-scale producers’ organization and marketing company under export polices. So, it is necessary that the government drive to coordinate the exporters and producers.
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