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한국형 전술데이터링크 시스템 구현을 위한 무선모뎀 시스템 설계
최효기,장호준,송영환,장동운,주재우,서난솔,Choi, Hyo-Ki,Jang, Ho-Joon,Song, Young-Hwan,Jang, Dhong-Woon,Joo, Jae-Woo,Seo, Nan-Sol 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6
Next Generation Weapon system from the center of the platform to share information in real-time Network Centric Warfare(NCW: Network Centric Warfare) has been changed. Data link system is defined as a network. That is, all in real-time battlefield information is to enable sharing. Data link system is classified as a precision strike, Monitoring/control, control of a Patriot missile battery systems. These systems are most effective in a Joint warfare and precision strike. Data Link Systems(Data Communications) implementation is accomplished by using the KDLM(Korean Data Link Modem) and Radio Transceiver. KDLM is operated in conjunction with the legacy Radios(re-using fielded HF/VHF/UHF radio systems). In this paper, we describe in terms of KDLM system design. In this paper, the proposed design structure is how to effectively interact with legacy various radio. First, The results provide an analysis of that Dynamic TDMA system and apply modem structure. Radio characteristics data are necessary for an effective TDMA system design. This article analyzes the test results and describes the structure to improve the receive performance.
개별소비세 일몰제가 회원제골프장의 내장객변화에 미치는 영향
최효기(Choi Hyo-Ki),유선종(Yoo Seon-Jong) 한국주거환경학회 2011 주거환경(한국주거환경학회논문집) Vol.9 No.2
This study attempted to analyze the monthly trends of golf course visitors per hole between two groups of the members-only golf courses in the metropolitan area of Incheon and Kyonggi province and of the non-metropolitan area of Kangwon and Chungcheong provinces before the application of reduction and exemption of the individual income taxes(21 months between Jan, 2007 and Sept, 2008) and during its period(27 months between Oct, 2008 and Dec, 2010) due to changes in the tax policy of government in the operation of the members-only golf course. For this purpose, this study employed the analysis instrument such as PASW Statistics(Version 18). As a result, the following findings were obtained: An attempt was made to analyze the hypothesis that the "reduction and exemption of the individual consumption taxes would reduce visitors to the golf courses in the metropolitan area and increase those in the non-metropolitan area such as Kangwon and Chungcheong areas." Statistical analysis showed that the hypothesis was significant. That is, it was found that there was no difference in the result of T-test of the matched sample using data on the number of visitors to the members-only golf courses in the central area(Kyonggi, Incheon, Kangwon and Chungcheong areas) before the enforcement of reduction and exemption of the individual consumption tax and during its period. The average number of the golf course visitors was reduced. And it was found that there was a difference in the mean between two groups of the members-only golf courses in the non-metropolitan central area(Kangwon and Chungcheong areas). The average number of the visitors increased. But an attempt was made to compare the trend of increase and decrease of the number of visitors per hole and that of increase of the number of simple golf course visitors. As a result, it was found that the number of visitors per hole reduced though the mean of the number of visitors was greatly increased. It is thought that it is more significant to use data on the number of simple golf course visitors in order to judge the effectiveness of the sunset law of the individual consumption tax. To investigate changes in the number of visitors per hole, it is thought that it is necessary to assume the rate of increase in holes for analysis.
여수철,홍수운,최효기,윤창배 한국전자통신학회 2018 한국전자통신학회 논문지 Vol.13 No.6
The C-band omni-directional antenna for drone control is mounted on the top or bottom and used to configure the communication link. The communication link is affected by the LOS depending on the mounting position of the omni-directional antenna. In this paper, two kinds of embedded antennas were designed with a commercial simulation tool CST MWS, and EM analysis was performed considering the mounting environment. Also, we propose the PTMP ground antenna for control a large number of drones. Ground antenna has a communication link of 30km, and it consists of four sector antennas in the horizontal direction and on directional antenna at the top. 드론 제어를 위한 C대역 무지향성 안테나는 드론의 상부 또는 하부에 장착되어 통신링크를 구성하기 위해 사용된다. 통신링크는 무지향성 안테나 장착위치에 따라 LOS의 영향을 받게 된다. 본 논문에서는 드론 탑재를 위한 내장형 안테나 2종을 사용 시뮬레이션 툴인 CST MWS로 설계하고, 장착환경을 고려한 EM 해석을 수행하였다. 또한, 다수의 드론을 제어하기 위한 PTMP 지상안테나를 제안하였다. 지상안테나는 30km의 통신반경을 갖기 위해 수평방향으로 4개의 섹터안테나와 상부에 1개의 지향성안테나로 구성하였다.
JTDLS 완성형 체계를 위한 항공기 내장형 안테나 설계
여수철(Su-Cheol Yeo),강병욱(Byoung-Wook Kang),최효기(Hyo-Gi Choi) 한국전자통신학회 2020 한국전자통신학회 논문지 Vol.15 No.3
본 논문에서는 JTDLS 완성형 항공기에 장착하기 위한 내장형 안테나 설계 방법에 대해 연구하였다. 제안된 안테나는 MIDS-LVT 운용 대역을 충족하고, 확장성을 고려하여 광대역으로 설계하였다. 설계결과, 제안된 안테나는 기존 블레이드 안테나와 전기적 성능은 유사하고, 광대역 특성임을 확인하였다. 항공기 장착성을 확인하기 위해 항공기 상/하부에 안테나를 장착하여 EM 분석한 결과, 상/하부 모두 양호한 복사특성을 나타내는 것을 확인하였다. 본 연구를 통해 획득한 기술은 JTDLS 완성형 항공기에 활용 가능할 것으로 판단된다. In this paper, we studied the method of designing a embedded antenna for mounting on the JTDLS complete aircraft. The proposed antenna satisfies the MIDS-LVT operation frequency band and is designed as a broadband in consideration of expandability. As a result of the design, it was confirmed that the proposed antenna has similar electrical performance to the existing blade antenna and has broadband characteristics. As a result of EM analysis, the antenna was mounted on the top and bottom parts of the aircraft to check the mount of the aircraft, and it was confirmed that both the top and bottom parts had good radiation characteristics. The technology acquired through this study is judged to be applicable to the JTDLS completed aircraft.
ITU 모델을 이용한 공용데이터링크 기반의 공중중계 시스템의 커버리지 예측
박재수(Jae-Soo Park),송영환(Young-Hwan Song),최효기(Hyo-Gi Choi),윤창배(Chang-Bae Yoon),황찬호(Chan-Ho Hwang) 한국전자통신학회 2020 한국전자통신학회 논문지 Vol.15 No.1
본 논문에서는 국제전기통신연합에서 권고하는 경로손실 예측모델을 이용하여 지상통제소와 무인 항공기 사이의 공대지 채널에 대한 경로손실을 예측하고, 이를 공대공 채널로 확장하여 중고도급 무인 항공기를 기반으로 하는 공중중계 시스템에 대한 네트워크 커버리지를 분석한다. 대기에 의한 경로손실 예측을 위해 한반도의 기후 및 지리적 인자를 활용하였다. 특히 국내의 강우량 및 유효지구반경 인자는 한국정보통신기술협회에서 공시한 실측 데이터를 활용하여 정확도를 높였다. 또한, 공중중계 송수신기는 현재 국내에서 개발 완료된 공용데이터링크 시스템의 주요지표를 활용하였다. 예측 결과로부터 임무 고도가 높아질수록 공중중계 시스템의 네트워크 커버리지가 넓어짐을 확인하였다. In this paper, we predicted the propagation loss for the air-to-ground (A2G) channel between the ground control system and the unmanned aerial vehicle (UAV) using the prediction model for the aircraft recommended by the International Telecommunication Union (ITU). We analyzed the network coverage of the aerial relay system based on the medium altitude UAVs by expanding it into the air-to-air (A2A) channel. Climate and geographic factors in Korea were used to predict propagation loss due to atmospheres. We used the measured data published by the Telecommunication Technology Association (TTA) for regional rainfall-rate and effective earth radius factors to increase accuracy. In addition, the aerial relay communication system used the key parameter of the common data link (CDL) system developed in Korea recently. Prediction results show that the network coverage of the aerial relay system broadens at higher altitude.