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위성 통신용 광대역 마이크로스트립-도파관 트랜지션 설계
김승환,임지수,최재훈,염인복,Seung-Hwan, Kim,Ji-Soo, Lim,Jae-Hoon, Choi,In-Bok, Yom 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-
본 논문에서는 KU와 ka 대역에서 사용되는 광대역 마이크로스립-도파관 트랜지션을 설계하였다. 도파관 내로 급전되는 핀 끝에 원통 모양의 디스크나 다단 원통형 캡을 달아서 광대역 효과를 내도록 하였고 삽입손실을 줄이면서 광대역화 특성을 구현하기 위하여 이항 다단 정합 변환기를 사용하였다. 설계되어진 K3 대역의 트랜지션은 $S_11이 20dB 이하의 특성을 나타내는 대역폭이 5GHz 이상으로 광대역을 나타내었다. 원하는 주파수 대역(30.6~31GHz)에서는 $S_11이 -35dB이하를 유지하며, 삽입손실 또한 0.1dB이하로 낮았다. Ku 대역 트랜지션은 $S_11이 20dB 이하인 대역폭이 2.5GHz 정도이며, 원하는 주파수 대역(14~14.5GHz)에서는 29dB이하의 낮은 반사특성을 나타내었다. In this paper, broadband microstrip-to-waveguide transitions for Ka and Ku band are designed. To broaden the bandwidth, a disk-loaded pin or a pin with multistepped cylindrical cap probing in waveguide can be used in waveguide. In order to match the impedance and to maintain the wideband characteristics with low insertion loss, binominal multisection matching transformer is used between the microstrip and the waveguide section. The bandwidth of a designed Ka band transition is over 5GHz for $S_11 less than 20dB. In the frequency band between 30.6GHz and 31GHz, $S_11 below -35dB and the insertion loss is less than 0.1dB. The designed Ku band transition has bandwidth of about 2.5GHz for $S_11 less than -20dB. In the frequency band of 14.0 to 14.5GHz, $S_11 is maintained below -29dB
아토피피부염에 대한 올바른 교육의 중요성에 대한 설문조사
도은진 ( Eun Jin Doh ),최미라 ( Mira Choi ),임지수 ( Ji Soo Lim ),윤현선 ( Hyun-sun Yoon ),이동훈 ( Dong Hun Lee ),김규한 ( Kyu Han Kim ) 대한피부과학회 2017 大韓皮膚科學會誌 Vol.55 No.6
Background: Therapeutic education is important for successful management of atopic dermatitis (AD). Objective: To provide effective therapeutic education, clear common misunderstandings, and answer questions regarding AD among patients and caregivers. Methods: A questionnaire survey was conducted for patients and caregivers who visited the Department of Dermatology at Seoul National University Hospital, Seoul, Korea, regarding the course, etiology, and management of AD. Results: Among the 327 subjects who participated in the study, only 35.2% were aware of the natural course of AD, which usually improves with age. Many subjects (53.2%) misinterpret AD relapse as resistance to topical steroids. We found that 87.8% of subjects were under the impression that improvement in a patient`s immunity can improve the symptoms of AD. Dietary restriction was considered an essential management strategy, and 59.0% of subjects agreed to delay the initiation of weaning foods. Most subjects did not have accurate information about cleansing methods, and 30.9% of subjects reported that they used only water without any cleanser. We noted that 47.5% of subjects obtained information regarding AD from medical doctors who they considered the most reliable sources (82.5%). Subjects preferred printed materials (41.3%) over seminars or video-clips to obtain educational information. Conclusion: Therapeutic education regarding the course, etiology, and management of AD using printed materials put together by physicians would be a valuable tool for the effective management of AD. Institutional support such as educational programs covered by the National Health Insurance Service is required. (Korean J Dermatol 2017;55(6): 329∼336)