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무선전력전송용 고지향성 Low-Profile 패치 안테나 설계
강은정(Eunjung Kang),서철헌(Cheolhun Seo),추호성(Hosung Choo) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.10
본 논문에서는 마이크로파 방식의 무선전력전송에 적용하기 위한 고지향성 low-profile 패치 안테나를 제안하였다. 제안된 안테나는 패치안테나를 캐비티 모델 이론을 바탕으로 하여 기본모드와 고차모드를 분석하고, 지향성 수식을 이용하여 최대 지향성을 가지는 방사체 크기를 도출하였다. 또한, low-profile 특성을 얻기 위해 최적 유전 상수를 적용하여 제작 비용 및 설계 구조를 단순화한 고지향성 low-profile 패치 안테나를 설계하였다. 제안된 패치 방사체는 한 변의 길이가 0.63λ0이고, 기판의 유전율이 5.4일 때, 최대 지향성이 11.4 dBi임을 확인하였다. 측정과 시뮬레이션 전면방향이득은 5.8 GHz에서 각각 8.5 dBi, 10.1 dBi이며, 안테나의 반사계수는 각각 −12 dB, −12.7 dB임을 확인하였다. In this study, we propose a high-directivity low-profile patch antenna for microwave wireless power transmission systems. The proposed antenna is analyzed according to fundamental and higher-order modes based on the cavity theory, and high-directivity characteristics are derived with an optimum patch size using the directivity formula. To achieve low-profile characteristics, a high-directivity patch antenna is designed by applying the optimum permittivity, which can simplify the structure and lower the manufacturing cost. For a side length of 0.63λ0 and substrate permittivity of 5.4, a maximum directivity of 11.4 dBi is observed. The measured and simulated reflection coefficients are −12 dB and −12.7 dB at 5.8 GHz, respectively, and the bore-sight gains are 8.5 dBi and 10.1 dBi at 5.8 GHz, respectively.
패션 브랜드 지면 광고의 문화적 포지셔닝 전략에 따른 색채사용
강은정;한솔비;조주연;이규해 한양대학교 2009 韓國 生活 科學 硏究 Vol.29 No.1
Brand advertisement can be effective when they can communicate with the customers who can share the culture and trend expressed through the advertisement. Therefore, the advertisers should be well aware of the possible target customer of the brand. Furthermore by making an advertisement that parallels cultural codes of the customers', it will be able to attract attentions from potential customers. This research analyzed the consumer culture positioning trends incorporated by female casual brands magazine advertisements, and examined the periodic changes and preferred colors for each different positioning type for the past five years. 345 magazine advertisements were classified into foreign consumer culture positioning and local consumer culture positioning types. Among the colors expressed in the advertisement, the color that occupied the largest visual area was selected as the main color of the advertisement. After chosen, the color was analyzed by Munsell's 10 hues and 12 tone classifications of PCCS (Practical Color Coordinate System). Ad with foreign consumer culture positioning counted for 281 taking the dominant portion, whereas local consumer culture positioning ad accounted for only 64. There were brands that implement culture positioning techniques than other brands. The 20 brands frequently applied foreign consumer culture positioning in their advertisements. The most frequently used hue was Red. Purple Blue was also common. In terms of value and intensity, dark grayish tone was also most commonly incorporated.