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RISS 인기검색어
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- 저자 : 한정수 ( Joong Su Han ) (검색결과 2 건)
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Anti-Jamming GPS 시스템을 위한 적응형 디지털 신호 처리에 관한 분석
한정수,김석중,김현도,최형진,김기윤,Han, Jung-Su,Kim, Seok-Joong,Kim, Hyun-Do,Choi, Hyung-Jin,Kim, Ki-Yun 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.8c
본 논문에서는 GPS 수신기로 유입되는 간섭 및 재밍 신호를 효율적으로 제거 또는 억압하기 위해 배열 안테나(way antenna)를 적용한 항 재밍(anti-jamming) GPS 시스템을 설계하고 운용 방안을 제시하였다. 특히 제안하는 안테나 구조 및 운용 방안은 전통적인 6 원형 배열 안테나(6 circular array antenna) 구조에서 중앙에 1개의 소자를 추가한 7 배열 원형 안테나 구조로써 주어진 간섭 및 재밍 환경 하에서 전력 효율적으로 운용된다. 아울러 적응형 배열 안테나를 사용하여 디지털 신호처리를 수행할 경우 성능이 우수한 것으로 잘 알려진 STAP(Space Time Adaptive Process)와 SFAP(Space Frequency Adaptive Process)를 적용하고 두 방식의 구조 및 복잡도에 관한 분석, 그리고 동일한 복잡도(Complexity) 조건에서 다양한 재밍 환경에서의 BER 성능 비교를 수행하였다. In this paper, we propose a design of GPS anti-jamming system and its operational method, which can effectively suppress interference and jamming signals induced in GPS receiver. The 7-array antenna used in the proposed system is composed of conventional 6 equi-spaced circular elements with one element on the center of antenna and can be efficiently operated under power-constrained conditions. Futhermore, in this paper, we analyze the structure and complexity of STAP and SFAP which are well known techniques in adaptive array antenna signal processing, and we compare the BER performances between STAP and SFAP in various jamming environment based on the same complexity.
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계량정보분석 기반의 연구개발 성과분석: 치매 치료용 천연약물 분야
전원경 ( Won Kyung Jeon ),한창현 ( Chang Hyun Han ),강종석 ( Jong Seok Kang ),허은정 ( Eun Jung Heo ),한정수 ( Joong Su Han ),이영준 ( Young Joon Lee ) 대한한방신경정신과학회 2011 동의신경정신과학회지 Vol.22 No.3
Objectives: Trend of R&D of herbal medicine for dementia treatment was examined based on the quantitative information analysis for establishing the national strategy of research on dementia treatment with oriental medicine. Methods: Definition was made to clarify the technology for development of herbal medicine for dementia treatment. Based on the initial keyword provided by experts in the field, queries were compounded to conduct search in the search engines of WoS and DWPI. The raw data (papers or patents) extracted from the initial search were examined by expert-review before objects of analysis were determined. Then, the accumulated data was analyzed in terms of year, country and organization, which led to examination of the trend of R&D. And the research performance evaluation for dementia treatment technologies was also made in terms of country, organization and researcher based on the forward citation analysis. The international cooperation intensity was examined on the basis of analysis of network by researcher before analysis results were put together to select lead researchers. Results: According to the quantitative information analysis of 1,330 articles that were selected as analysis objects, the number of papers on natural products research for dementia treatment has increased by around 4.6 times in recent five years. This indicates that the intensive studies have been underway recently. It was found to be the US that had the highest level in research filed of herbal medicine for dementia treatment and the highest capacity of international cooperation for that purpose. On the contrary, Korea had the share of papers at 5.1%, the number of countries in cooperation research at 8, and the article quality index at 0.40, showing that the qualitative level was insufficient, compared to the quantitative outcome. In particular, Korea was found to have no intensity of international cooperation among researchers. In case of patent, the results of information analysis of 305 patents selected as analysis objects demonstrated that China had the highest share while Korea had the very low frequency of patent application quantitatively. Conclusions: In this study, the research to develop herbal medicine for dementia treatment has recently drawn much attention that has spread around the globe. Therefore, these results suggest establishing the strategy to develop technology for dementia treatment with oriental medicine in the future based on quantitative information analysis.
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