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조대영,김정환,이명원,이주형,Cho, Dae-young,Kim, Jeong-hwan,Lee, Myoung-won,Lee, Ju-Hyoung 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.3
해양 산업과 서비스업의 성장으로 인하여 소형 선박의 사고가 증가하고 있다. 이러한 문제를 해결하기 위하여 소형 선박에 레이더 의무 장착을 시행하고 있다. 하지만 기존의 펄스 레이더를 소형 선박에 설치하면 유지보수 비용 및 높은 송신 전력등의 문제들이 발생한다. 본 연구에서는 전자적으로 빔을 회전하는 위상배열안테나를 이용하여 상기문제를 해결가능한 선박용 고정형 레이더에 적용 가능한 안테나를 제작하여 시험하였다. 그 결과 정면에 대한 빔 폭은 $5^{\circ}$내외로 레이더에 적용에 대한 가능성을 볼 수 있었다. The accident of the small vessel is increasing due to the growth of the sea and service industry. According to data from National Statistical Office, for 100 ton less than small ship accident, the most of the shipping incident generated in the small ship by 84% of the total shipping incident in 2015. The radar obligatory mounting is enforced to the small vessel in order to conclude this problem. However, the problems including the maintenance cost and transmission power etc. happens high if the existing pulse radar is mounted in the small vessel. In this development, the development is for small ship fixed type radar the object. And in this paper, by using the phase array antenna revolving electronically around the beam, the antenna which it is applicable to the marine fixed type radar which can solve above problem was made and it tested.
조대영,김정환,이명원,이주형,윤원상,임태호,고학림,Cho, Dae-young,Kim, Jeong-hwan,Lee, Myoung-won,Lee, Ju-Hyoung,Lim, Tae-Ho,Yoon, Won-Sang,Ko, Hak-Lim 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.5
본 개발에서는 위상 배열 안테나를 이용하여 전자적으로 빔을 회전하여 주변의 물표를 탐지할 수 있는 선박용 고정형 레이더를 제작하여 테스트하였다. 전자적인 회전 방식을 사용하는 고정형 레이더는 기존의 선박용 펄스 레이더의 문제점인 염분 및 해풍에 의한 부식과 회전축 마모문제를 해결할 수 있다. 또한 본 과제에서는 저출력 방식의 탐지방식인 FMCW 방식을 사용함으로써 고출력 레이더 사용으로 인한 인체에 대한 전파 피폭 문제와 마그네트론의 유지보수 비용 문제를 해결 할 수 있을 것으로 기대한다. In this development, By using the phase array antenna, the beam around was electronically revolved and the marine fixed type radar of which the detection is possible was made and the check around was tested. There are the risk of the corrosion because of the abrasion of the axis of rotation and salinity with the way that the existing marine pulse radar detects the check by using the mechanical rotation. Besides, the maintenance cost of the magnetron gets to happen by using the detection signal. In this development, The fixed type radar of the low output which revolves electronically around the beam by using the radar signal processing method of the phase array antenna using the phase shifter and FMCW(Frequency Modulation Continuous Wave) method was made. And by using the fixed type radar, the check detection test was conducted.
조대영,김계원,이승구,김민상,박병훈,고학림,Cho, Dae-Young,Kim, Kye-Won,Lee, Seung-Goo,Kim, Min-Sang,Kim, Kil-Yung,Park, Byeong-Hoon,Ko, Hak-Lim 한국융합신호처리학회 2013 융합신호처리학회 논문지 (JISPS) Vol.14 No.2
RF 중계기의 증폭율은 궤환되어 재수신되는 중계기의 출력 신호에 의해 제한된다. 따라서 궤환되어 재수신되는 간섭 신호를 제거하기 위한 간섭제거용 중계기가 개발되었다. 간섭제거 중계기는 중계기의 출력 신호를 기준신호로 이용하여 증폭 후 재수신되는 궤환 신호의 진폭 및 위상을 추정하여 제거한다. 하지만 간섭신호의 추정 및 제거 알고리즘의 연산량이 매우 많아 고속의 신호처리를 위한 하드웨어의 비용이 증가한다. 더욱이 간섭제거 중계기는 기지국으로부터 수신되는 다중 경로 신호에 의한 중계기 신호의 SINR 저하와 복수개의 기지국에 의한 파일롯 오염 문제를 해결할 수 없다. 따라서 본 연구에서는 스위칭 빔 구조의 스마트 안테나를 구현함으로써 앞에 언급한 문제를 해결하였다. 즉, 본 연구에서는 RF단의 추가 없이 중계기용 스마트 안테나 시스템을 구현하였으며, 저가의 마이크로 프로세서를 이용하여 기지국 방향을 추정하면서도 궤환되어 재수신되는 간섭 신호를 제거함으로써, 스마트 안테나의 적용에 의한 중계기 가격과 크기의 증가를 최소화 하였다. 우리는 제안된 시스템의 성능 검증을 위하여 중계기의 출력 SINR에 대한 증폭율과 중계기의 입력 SINR 대비 간섭 제거 후의 출력 SINR에 대한 성능 비교를 수행하였으며, 성능 비교 결과 같은 중계기의 출력 SINR에 대해 본 연구에서 제안한 스마트 안테나 구조를 중계기에 적용하는 경우 증폭율이 간섭제거 중계기에 비해 약 23dB 증가하였으며, 간섭 제거에 의한 출력 SINR은 약 6dB 증가함을 알 수 있었다. The amplification rate of a RF repeater is limited by the feedbacked signals from the same repeater. And an ICS (Interference Cancellation System) repeater has been developed to remove the feedbacked signals. The ICS repeater estimates the amplitudes and the phases of the feedbacked signals and removes the estimated feedback signals from the received input signal of the repeater. However, it requires lots of hardware complexity and this leads to the increase the cost of the repeater. Moreover, the ICS repeater can not solve the pilot pollution problems. To solve these problems, we have studied the implementation and adaptation of smart antenna system for RF repeaters. We have designed a smart antenna system with a switching beam structure in order to reduce the hardware and computational complexity. After analyzing the proposed smart antenna system, we found out that the amplification rate of the proposed repeater increases 23dB compare to the amplification rate of ICS repeater and the output SINR increases 6dB compare to the ICS repeater.
수장부소와에서 발생한 기저세포암을 동반한 모반양 기저세포암 증후군
조대영 ( Dae Young Cho ),이승철 ( Seung Chul Lee ),원영호 ( Young Ho Won ),전인기 ( Inn Ki Chun ) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.4
Nevoid basal cell carcinoma syndrome is a genetically determined disorder characterized by multiple basal cell carcinoma, palmoplantar pits and defects in other organs or tissues. Basal cell carcinoma may arise any sit of body. But infrequently typical basal cell carcinomas arise from the depressed epidermis which forms the base of the pits on the hands and feet. The patient was a 12 years old girl who developed multiple black-colored papules on the face and a dark reddish to black-colored pit over the palm and skin-colored depressed circumscribed pits on the plantar surface of feet. she also had an odontogenic cyst in the right maxilla, epidermal cyst on the trunk and mutiple intradermal nevi on the face. But the family history was not present. The histopathologic findings of the depressed pit of the palm showed a crater on the stratum corneum, and a well marginated tumor nest of basal cell carcinoma showing keratotic feature on the center of the lesion and reticulated feature on the periphery. (Kor J Dermatol 1996;34 4): 684-688)
조대영 ( Dae Young Cho ),원영호 ( Young Ho Won ),전인기 ( Inn Ki Chun ) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.1
Background: Angiokeratoina is a vascular dermatosis characterized by telangiectasia or hemangioma with a horny overgrowth. Five clinical types have been reported as follows ; angiokeratoma corporis diffusum of Fabry, angiokeratoma of Mibelli, angiokeratoma of Fordyce(AF), papular angiokeratoma(PA) and angiokeratoma circumscriptum (AC). There has not been any report on the general status of angiokeratoma in Korea except several case reports. Objective : The purpose of this study was to review the clinical and histopathological feature of 23 cases diagnosed as angiokeratoma. Methods : We reviewed cetrospectively twenty-three cases with angiokeratoma who were patients at the Department of Dermatology, Chonnam University during the past 15 years from 1981 to 1995. The clinical and histopathological features of the patients were evaluated and classified into five clinical types by Lever and Schaumburg-Lever's classification. Results : Total number of patients with angiokeratoma were 23 and consisted of 11 of PA(48%), 9 of AC (39%), 3 of AF(13%). The ratio of males to females was 1.3: 1. The mean age was 23.1 years. The first onset was predominantly from the first to second decades of life in 65.2%. The most predilection site in the patients was lower extremities(74%), followed by genitalia(13.0 %), trunk(8.7%), and neck (4.3%). All lesion of the AC appeared on the lower extremities. The lesions were usually asymptomatic(47.8%), however, pruritus and pain were complained of in 34. 8% and 17.4% cases respectively. The size of the lesions was below 1cm in 34.8%, 1-2cm in 30.4%, and more than 2cm in 34.8%. Each clinical type of angiokeratoma was essentially similar in its histopathologic findings. The most prominent, epidermal change was rete ridge elongation in 100%, followed by acanthosis in 78.3%, and hyperkeratosis in 73.9%. The dilated capillary in the upper dermis was encircled partially by elongated rete ridges in PA and AF. Dilated vessels and hemangiomatous vascular changes were found in the mid and low dermis in 8 cases of AC, and in the subcutis in 3 cases of AC. Conclusion : Angiokeratomas are benign vascular tumors which occurs commonly on the leg of young adults. Three types of the angiokeratomas, namely PA(11cases, 48%), AC(9cases, 39% ), and AF(3cases, 13%), were observed. (Kor J Dermatol 1996;34(1): 17-24)