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주파수 가중 MTI를 이용한 FMCW 레이다 손동작 인지 기법
신민건,박완희,김현진,이영한,이성호,김병성 한국전자파학회 2020 한국전자파학회논문지 Vol.31 No.10
This paper proposes a signal processing technique that recognizes hand motions using a 60-GHz frequency-modulated continuouswave radar system. In the case of hand motion recognition with a radar, the recognition accuracy decreases owing to a clutter signal generated by the upper body and differences between the hand sizes of different people. To solve this problem, this paper proposes a moving target indicator filter with a weighted frequency for each frequency, which improves hand motion recognition accuracy, removes self-interference clutter signals, and uses a range profile and Doppler profile. Neural networks can recognize hand movements; hence, the proposed five hand gesture recognition techniques exhibited an 87.3% accuracy, regardless of the user.
FR-4 PCB에 구현한 저가형 24 GHz 레이다 시스템
이용석,신민건,김준성,박재현,정진우,김병성 한국전자파학회 2019 한국전자파학회논문지 Vol.30 No.10
In this study, a 24-GHz frequency modulated continuous wave(FMCW) radar system was designed on an FR-4 board to demonstrate the feasibility of low-cost radar systems. As the FR-4 substrate has a large substrate loss, its thickness was carefully determined considering line loss and radiation efficiency. Additionally, to operate the radar chip in the industrial scientific and medical(ISM) band without using a phase locked loop(PLL), we superposed and used the triangular wave signal of the DAC and proportional to absolute temperature (PTAT) voltages as a VCO tuning voltage. The designed radar has an operating frequency range of 24.02~24.25 GHz, output power of 4 dBm, a total receiver voltage gain of 66 dB, and an antenna gain of 9 dBi. The RF and MCU boards both use FR-4, and the size of the radar module is 4 cm×4.5 cm.
문경태,박상렬,신민건 대한토목학회 2017 대한토목학회논문집 Vol.37 No.4
Jeju Island is composed of irregular volcanic rock layers formed by several volcanic activities. Since structure such as the offshore wind turbine has to support considerably large over turning moment due to long distance from foundation to load point and relatively large horizontal load. Pile foundations are needed to economically support such structure even in the case of rock layer. Therefore, in this study, mechanical performances are estimated by mixing ratio of water, cement, and sand to figure out optimal mixing ration of fillingmaterial for pile penetrated to rocky layers, and outcomes of this study are compared and analyzed with results of other researches. In the same conditions, mechanical performances of the mortar (S/(S+C)=20~40%) are better than those of cement paste and soil cement. On the basis of major outcome of this study, appropriate range of mixing and a strengthening model are suggested. 제주도는 여러 차례의 화산활동에 의해 형성된 섬으로 불규칙한 화산암층 구조를 가지고 있다. 해상풍력발전기와 같은 구조물은 기초에서부터하중 작용점까지의 거리가 멀고 상대적으로 큰 수평하중이 작용하여 매우 큰 전도모멘트를 지지해야 한다. 이러한 구조물을 경제적으로 지지하기 위해서는 암반층이라도 말뚝기초를 시공해야 한다. 따라서 본 연구에서는 암반매입말뚝을 위한 주면고정액의 적정배합비를 찾기 위하여 물,시멘트, 모래의 배합비를 달리하여 역학적 성능을 평가하고, 실험 결과와 기존 연구 결과를 비교분석하였다. 동일한 배합조건에서 시멘트풀과소일시멘트보다 모르타르(잔골재 비=20~40%)의 역학적 성능이 우수하게 나타났다. 이 결과를 바탕으로 적정배합범위와 강도추정식을 제안하였다.