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국내 전파환경에 적합한 지상망간 전파간섭 조정방안 연구
이일근(Ill-Keun Rhee),박병석(ByungSeok Park),최인식(In-Sik Choi) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.1
In this paper, we proposed a radio-wave propagation prediction simulator that predicts field strength and propagation interference for domestic environments. This simulator is obtained by compensating parameters based on both Rec. ITU-R P.1546-2 algorithm and real measured data, and thereby has the form of an mathematical expression in the given environment. we showed that the developed simulator in this paper is very robust by comparing simulation results with real measured data. Furthermore, an illustrative example of the simulator is given for the DTV service.
Performance Analysis of Highly Effective Proposed Direction Finding Method
이일근,Rhee, Ill-Keun The Acoustical Society of Korea 1995 韓國音響學會誌 Vol.14 No.e1
The main purpose of this paper is to show the realizaability of the proposed highly effective direction finiding method which performs extremely well under the circumstances like low signal-to-noise ratio (S/N), very closely located signal sources, and so on. In order to achieve the purpose, the degree to which the proposed method is superior to the MUSIC(multiple signal classification) with respect to the S/N is discussed, and the result is analyzed in terms of the S/N and the number of sample data. 본 논문의 주된 목적은 주위 환경의 영향등으로 인하여 신호대잡음비(S/N)가 저하된 상황, 다중신호원들이 근접하여 위치한 상황등의 특수한 상황들에서도 고해상도를 지니는 도래방향각 예측방법의 개념적 S/N의 향상도를 이론적으로 증명하고 기존의 도래방향각 예측방법과 비교하므로서 제안된 방법의 실용화를 위한 이론적 타당성을 입증하는데 있다.
고해상도 센서어레이 신호처리법을 이용한 원자력발전소 핵증기 공급계통의 새로운 금속파편 진단기법
이일근,최재원,Rhee, Ill-Keun,Choi, Jae-Won 한국음향학회 1997 韓國音響學會誌 Vol.16 No.6
원전내 금속파편들을 조기에 탐지하기 위한 금속파편 감시계통(LPMS : Loose Parts Monitoring System)은 원전의 안전성 및 신뢰도 확보를 위하여 중요한 부분으로서, 대부분의 국내 원전들에서 설치 운영중이거나 운영예정이다. 하지만 이들 LPMS들은 외국에서 개발된 것들로서 고가이며 기술이전이 이루어지지 않아 기술종속의 우려와 함께 효과적인 금속파편 진단에 많은 어려움을 지닌다. 따라서 본 논문의 주된 목적은 고해상도를 가지며 분석방법이 간단한 효율적인 금속파편 위치평가를 위한 알고리즘을 제안, 실현하므로써, 빈전문적인 운전자도 컴퓨터를 사용한 간단한 조작을 통하여 정확하고 신속한 금속파편 진단을 수행할 수 있도록 하는 것이다. 본 논문에서 제안한 수정된 원교차법을 이용하여 작성된 금속파편 위치평가 프로그램을 이용하여 실제 원전상황을 고려한 모의실험을 실시한 결과, 제안된 평가기법이 약 3.4% 정도 오차를 가지는 우수한 위치평가를 수행함을 알 수 있었다. Loose parts monitoring system(LPMS), which is used to detect metallic loose parts in the nuclear power plant, plays an important role in safe and reliable operation of the plant. To prevent from the damage due to the loose parts, most domestic nuclear power plants are using, or planning to use LPMS. However, these LPMS's, which are all invented from overseas and thereby depend on the oversea technologies, are very expensive, and are known to be inefficient to diagnose loose parts due to the lack of fundamental know-how of LPMS. Therefore, the main purpose of this paper is to propose and to realize a new loose parts localization algorithm which is simple and efficient enough even for the inexperienced operators to diagnose loose parts accurately and promptly. Considering practical nuclear power plant circumstances, some simulations for estimating the loose parts location have been done. The results show that the proposed method, called a modified circle intersection method, performs high resolved loose parts localization with 3.4% of error.
허유진(Yu-jin Heo),이일근(Ill-Keun Rhee),김상암(Sang-Am Kim),박종민(Jong-Min Park),이영훈(Young-Hun Lee) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.2
This paper presents a design methodology for the interference analysis simulator design of multi-beam satellite system user down-link to provide effectively mobile satellite service in the domestic environment. Furthermore, this paper shows an analysis example of co-channel interference influenced to a mobile earth station by base stations for terrestrial mobile service as well as by satellite, with same frequency band as the wanted satellite, serving to mobile earth stations in another cells, using the designed simulator, and proposes a useful co-channel interference coordination scheme for coexistence between mobile satellite service and terrestrial mobile service by way of guard space establishment, frequency reuse, etc.