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문창만(Chang-Man Moon),안도진(Do-Jin An),이준호(Joon-Ho Lee) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.6
레이다 안테나에서 송신한 신호가 어떠한 물체에 도달한 뒤 다시 안테나로 수신되는 과정에서, 환경에 의해 생성되는 클러터는 원하지 않는 요소이다. 클러터는 안테나의 빔 패턴과 어떠한 물체의 거리, 고도 등에 의해 계산되며, RCS로 나타낼 수 있다. 지면 기반 레이다에서 임의의 물체에 대한 지표면 클러터 RCS를 구하고, 레이다 방정식을 이용하여 지표면 클러터 RCS가 지면 기반 레이다 안테나에 수신되는 신호에 미치는 영향을 분석해본다. A radar receives reflected signals from various objects to detect a target. Undesired object, called clutter, as well as the target generates reflected signals. The clutter radar cross section(RCS) is dependent on many factors, which are the antenna pattern, distance between the radar and the target, and the height of the target and the radar. Herein, surface clutter RCS for ground-based radar is analyzed, and the effect of the surface clutter RCS on the received signal is investigated.
문창훈(Chang Hoon Moon),김남성(Nam Sung Kim),김경진(Kyung Jin Kim),석윤철(Yun Chul Suk),권용만(Yong Man Kwon),문창현(Chang Hyun Moon),이인수(In Soo Lee),이중건(Chung Keun Lee) 대한내과학회 1991 대한내과학회지 Vol.40 No.4
N/A Out of 1,500 elderly patients who visited Seoul Adventist Hospital from July, 1988 to 30th June 30, 1989 hed anemia. We have determined the relation of the hemoglobin value and the causative diseases in every patient with anemia. In this study, anemia was defined as follows: less than 6 gm% hemoglobin as severe; greater than or equal to 6 gm% hemoglobin and less than 9 gm% hemoglobin in men, less than 12 gm% in women as mild. The results were as follows: 1) The total incidence of anemia was about 50.5% of the 1500 patients, and those were 55.2% in men, and 45. 4% in women. 2) The of male to female ratio patients with anemia was 1.3:1, and most of them of a were mild degree. 3) The most frequent cause of anemia in these patients was acute infections, Malignancies. chronic infections, GI tract diseases, and hepatobiliary diseases followed that in order. 4) The diseases which accompanied severe degrees of anemia were GI tract diseases with bleding, hematologic disorders, and malignancies. Acute and chronic infections were mainly accompanied by mild anemia. 5) Kidney disease, in which chronic renal failure was the most prominent entity along with malignancies a showed relatively higher percentage of a moderate degree of anemia. 6) Patients with hemorrhage and those with malignancy with distant metastasis showed a relatively lower hemoglobin value than those without them. 7) Among acute infections, infections of the respiratory tract wes the leading cause, and patients with tuberculosis were the majority of those with chronic infections.