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RISS 인기검색어
- 검색키워드
- 저자 : 박병찬(Byoung Chan Park) (검색결과 4 건)
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오차보정과 디지털 다중 빔형성 기법을 이용한 다중목표물 추정에 대한 연구
박병찬(Byoung-Chan Park),김우성(Woo-Sung Kim),이관형(Kwan-Hyeong Lee) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
레이더는 안테나를 이용하여 공간상에 전자파를 송신하여 목표물에 대한 거리, 방위각, 고각을 측정하는 시스템이다. 안테나 소자에 수신되는 위상과 크기 오차들이 보정되지 않는다면 시스템 성능이 크게 감소한다. 본 연구에서는 적응배열 안테나를 이용하여 원하는 방향의 신호를 수신하고자 한다. 그리고 오차보정기법과 디지털 다중 빔형성 기법을 이용하여 목표물의 위치를 정확히 추정하고자 한다. 본 논문에서는 시뮬레이션을 통하여 디지털 다중 빔형성기법과 빔 오차 보정 기법에 근거를 둔 제안된 신호 추정방법이 기존의 방법에 비해 목표물 추정 면에서 우수함을 보인다. Radar is measurement system a distance, azimuth, and elevation of target to electromagnetic waves transmission at using antennas. System performance highly decreased if received signal at antenna element is not phase and amplitude error correction. This paper is received a desired firection signal using adaptive array antenna., and we correctly estimated target position using error correction technique and digital multi beamforming technique. Through simulation, we show that the proposed signal estimation method based on digital multi beamforming technique and beam error correction technique, improves the performance of target estimation compared to previous method.
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박병찬(Byoung Chan Park),이종육(Jong Yuk Yi),김태윤(Tae Yoon Kim),조백기(Baik Kee Cho),허원(Won Houh) 대한피부과학회 1992 대한피부과학회지 Vol.30 No.1
We report herein a case of smooth muscle hamartoma associated with Beckers nevus in a 5-year-old female. The child presented with a slight.ly brownish. 2 x 3 cm sized, pigmentecl patch with follicular accentuation on the right forearm, witch had been observecl since age of 2. Histopathologic findings showed the epidermal changes most consistent with Becker's nevus and the presence of irregularly arranged hyperplastic smooth muscle hundless in the dermis. (Kor J Dermatol 1992; 30(l): 115-118)
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박병찬(Byoung Chan Park),이준영(Jun Young Lee),김형옥(Hyung Ok Kim),김정원(Chung Won Kim) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.3
We performed an epidemiologic survey to investigate the dermatologic problems from cutting oils in metal workers. The personal questionnaires and dermatologic examinations were performed on 360 metal workers who were working at 50 metal industries. The pH meter (HANNA 8520) and the atomic absorption spectrometer(G.B.C. 902) were employed to measure the pH values of cutting oil and the concentration of heavy metals contained in cutting oil respeetively. The results were as follows : 1. The prevalence rates of the dermatologic disorders from cutting oil were 46.0% of eontact dermatitis, 10.9% of black comedone, and 7.1% of paronychia in orders. The dermatologic disorders that seemed to be not directly associsted with cutting oil were callosity(19.1%), burn by metal chips(9.8%), and mechanical injury(5.7%). 2. The localizations of the contact dermatitis and the black cemedone from cutting oil were 84% of hands, 6.69o of face, and 5% af forearms. More detailed localizations of the contact dermatitis and black comedone that developed in hand were 29.6% if finger tip, 27.6% of palm and palm finger, and 19.1% of palm finger only in orders. 3. The prevalence rates of the dermatologic disorders by the of cutting oil were 51.5% of soluble oil, 68.8% of insoluble oil, and 80.8% of mixed cutting oil which containing both soluble and insoluble oil. 4. The mean pH value of aoluble cutting oil was 8.0 and that of insoluble cutting oil was 7.0. 5. The concentrations of heavy metals contained in soluble oil were 32.2 mg/m of chrome, 6.42 mg/m of nickel, and 4.85 mg/m of cobalt. The concentrations of heavy metals contained in inspluble oil were 24.11 mg/m of chrome, 4.63 mg/m of nickel, and 2.30 mg/m of co.tKor d Dermatol 20(3): 208-$08,1001) Kiry Worde . Cutting oil, Heavy metals, pH
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박병찬(Byoung Chan Park),허동(Dong Houh),김형옥(Hyung Ok Kim),김정원(Chung Won Kim) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.2
A 10-year-old boy had a recurrence of cutaneous lesions 1 week after only one exposure to jellyfish on the lower extremity. The recurring lesion was charaeterized by pruritic several linear or whiplash-like erythematous and some edematous papuloplaques. The histopathologic findings showed focal hyperkeratosis, acanthosis in epidermis and mild perivascular infiltration of inflammatory cells, capillary proliferations in dermis. (Kor J Dermatol 29(2):214 217)
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