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정진우,김재신,한덕찬,Jung, Jinwoo,Kim, Jaesin,Han, Duk-Chan 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.1
In this paper, we propose a new array antenna scheme which has an improved side lobe level (SLL) as well as a simplified feeding network and a high gain. The proposed array scheme is based on a non-uniformly excited sub-array. For analysis, we use an array factor of sub-array antenna. In the simulation results, the simulated SLL and gain provide more than 18.43 dB and 26.63 dBi, respectively. For the verification of the proposed design scheme, the prototype antenna with $16{\times}8$ radiating elements was designed by the proposed array scheme. The measured SLL and gain are more than 19.85 dB and 25.53 dBi, respectively. This measurement result indicates that the proposed array scheme is reasonable.
다변수 모노펄스 추적 시스템에서 유전 알고리즘 기반 선형구간 확장
정진우,김재신,류영재,Jung, Jinwoo,Kim, Jaesin,Ryu, Young-Jae 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.2
In this paper, we consider a single-channel amplitude comparison monopulse system(SCACMS). The monopulse ratio curve(MR-C) of the SCACMS can be controlled by an amplitude difference between sum and different signal, a phase difference and the coefficient of the signal processor. We first propose the SCACMS with multiple variables, and then apply a genetic algorithm to optimize the multiple variables in terms of minimizing a root mean square error. The simulation results show that when three variables of the SCACMS are jointly optimized, the linear region of the MR-C can be extended approximately 187 % compared to that of two variables.
사회연결망 분석을 활용한 나노기술 연구동향 국가간 비교분석
배성훈(Seoung-Hun Bae),김재신(JaeSin Kim),신광민(Kwang-Min Shin),윤진선(Jin-Seon Yoon),강상규(Sang-Kyu Kang),김준현(Jun-Hyun Kim),이정우(Jungwoo Lee),김민관(Min-Kwan Kim),한창희(Chang-Hee Han) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.2
Nanotechnology is a leading branch of technology and is expected to improve national industrial competitiveness. For maintaining a sustainable growth in nanotechnology, Korean government has set up specific plans from a long-term perspective. One of these plans is tracking and promoting certain potential technologies called Future 30 Nanotechnologies. This study aims to develop an analysis framework for comprehending the Future 30 Nanotechnologies. We applied this framework to the carbon nanomaterials field. Through co-authorship and keyword network analysis, we identified the research trends of three countries (i.e., Korea, US, and China.). This research framework could be utilized in the development of a nanotechnology policy.