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안광환,신봉섭,방재훈,안병철 한국정보기술학회 2014 한국정보기술학회논문지 Vol. No.
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. 본 논문에서는 항공기와 지상국 통신용으로 적합한 표면 일체형이며 소형인 UHF 대역 디스콘 안테나를 제안하였다. 제안된 안테나는 원뿔, 상부 디스크, 하부 디스크, 금속 캐비티 및 레이돔으로 구성된다. 안테나 주변 구조의 영향을 최소화하기 위해 디스콘을 금속 캐비티 안에 설치하였으며 캐비티의 측벽 영향을 줄이기 위해 측벽에 전파 흡수체를 설치하였다. 통상적인 디스콘 안테나에서 원뿔의 높이를 크게 감소시킨 후 2개의 디스크를 원뿔 위에 배치하여 안테나 직경을 감소시켰다. 기본 구조에서 출발하여 설계변수 분석을 토대로 안테나를 최적 설계하였다. 최적 설계된 안테나의 직경은 500mm(중심 주파수에서 0.75파장)이며 높이는 62.5mm(0.094파장)이다. 안테나를 제작하여 측정한 결과 고각방향 최대이득 0dBi, 방위각 방향 최대이득 –1.2dBi의 특성과 0.43–0.47GHz에서 -10dB 이하의 반사계수 특성을 보였다.
안광환,배영민,김동완,주우홍 Institute of Genetic Engineering Changwon National 2002 Gene and Protein Vol.6 No.-
To develop the biological control agents on postharvest diseases of persimmon fruits, several fungi were isolated from decayed persimmons after several months in cold storage. One major pathogen of postharvest disease was identified on the basis of morphological characteristics as Aternaria sp..
단감의 최적 Modified Atmosphere포장 규격 설정
안광환,최성진,이동선 한국포장학회 2007 한국포장학회지 Vol.13 No.2
A respiration rate analysed by enzyme kinetics-based respiration model and gas permeability data of LDPE film were applied to design the optical modified atmosphere (MA) packaging condition of persimmon (Diospyros kaki cv. Fuyu) fruits. The fruit quality rapidly decreases due to physiology disorder such as softening and peel blackening. O2 permeance (QO2 in mlㆍhr−1ㆍatm−1ㆍm−2) and CO2 permeance (QCO2 in mlㆍhr−1ㆍatm−1ㆍm−2) of low density polyethylene (LDPE) film samples were measured at 0oC and described as function of thickness (L in μm) as QO2 = (2540×1/L)-16, and QCO2 = (13742×1/L)-70, respectively. MA package containing single persimmon fruit of 225g was designed and tested experimentally at 0oC by using LDPE films. Package atmospheres predicted from the relationship of O2, CO2 and N2 balances on the packages was in good agreement with those obtained experimentally. Physiology disorder occurrence was the lowest at 52 μm package that attained optimum gas condition (O2 2.8% and CO2 5.4%). The computer simulation was found to be effective to help to design the optimum MA packaging condition of individual persimmon fruit.
미국 수출 단감 포장의 현황 및 수송 중 컨테이너 온도관리 실태
안광환,이동선 한국포장학회 2009 한국포장학회지 Vol.15 No.1
Current status on consumption and packaging of sweet persimmons in USA was surveyed by visiting the market, and three sea shipments were conducted as model export trial from Korean to USA with measurement in ship container temperature and fruit quality. Strategy to promote the export of Korean persimmons was derived. There have been gradual decrease in the price of persimmons due to their increases production, but there seems potential growth in consumption of the fruits from Asian, Hispanic and American people. Compared to the fruits from other countries, Korean persimmons are desired to have higher soluble solid content with stronger red color, but too large sizes are not favored in American market. There has often been temperature fluctuation in shipment container during the sea transport to USA, resulting in surface blackening, skin black spotting and flesh softening. Plastic bag packages with inappropriate unitizing crimping were found to sometimes build up unproper modified atmosphere (high O2 and low CO2) giving high rate of physiological injury.
안광환,배영민,김동완,주우홍 Institute of Genetic Engineering Changwon National 2002 Gene and Protein Vol.6 No.-
To develop the control method of postharvest disease on persimmons, the analysis of a major pathogen of postharvest disease and incidence of the disease on persimmon fruits were studied from 2001 to 2002. A major postharvest pathogen was identified on the basis of morpholoical characteristics as Peniacillium sp..
부유 단감의 연화방지를 위한 1-Methylcyclopropene의 실용적 처리방법
안광환(Gwang Hwan Ahn),최성진(Seong-Jin Choi) 한국원예학회 2010 원예과학기술지 Vol.28 No.2
에틸렌 작용억제제인 1-MCP는 ‘부유’ 단감의 저장 후 상온 유통 중에 발생하는 과육의 급속한 연화를 방지하는데 효과적으로 이용될 수 있다. 1-MCP의 관행적인 처리 방법은 가스 기밀도가 높은 저장고에 대량의 과실을 밀폐한 후 SmartFreshTR를 물에 녹여 1-MCP 가스를 발생시키는 것이다. 그러나 본 연구에서는, 미량을 쉽게 취할 수 있도록 SmartFresh를 silica 분말과 혼합하여 증량하거나 접착 테이프에 부착한 후 과실 포장 상자에 이를 직접 투여함으로써 공기 중의 수분에 의해 1-MCP를 발생시켜 처리하는 방법을 고안하였다. 이러한 실용적인 1-MCP 처리 방법은 관행적인 처리 방법과 동일한 수준으로 저장 단감의 연화를 억제하는 효과를 보였다. 1-Methylcyclopropene (1-MCP), the gaseous ethylene action inhibitor, is an effective compound for delaying post-storage flesh softening of ‘Fuyu’ persimmon fruits. Conventionally, 1-MCP is treated on fruits in storage room by dissolving SmartFreshTR powder, the 1-MCP generating agent, in water. In this study, the practical methods were positively worked out when a small portion or a dilute of SmartFresh, either stuck on adhesive tape or premixed with silica powder, was enclosed directly into a modified atmosphere (MA) packaged fruit box. The 1-MCP gas was generated from the SmartFresh by absorbing moisture from atmosphere of the package. Treatments by these methods delayed the post-storage softening of ‘Fuyu’ persimmon as effectively as the conventional method.