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A SINGLE-CHIP-COMPUTER-BASED SEISMIC RECORDER
Kun, Liu Gua,Bing, Pang,Qi, Jiang Fa,Hong, Xia 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
A cost-effective seismic recorder used to record the maximum acceleration and maximum velocity of earthquake strong-motion sequences together with the time of origin is developed. Taking advantages of the single-chip-computer-based design, it provides not only more information storage but also a low-power-comsumption capability and an easy method of data-collecting afterwards.
Superluminescent diode integrated with monitor photodiode
Zhou Shuai,Liu Kun,Li Peng,Pang Fu-Bin,Zhang Jing,Kong Xiang-Ping,Duan Li-Hua,Zhang Chang-Chun 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2
Ridge-waveguide superluminescent diodes with integrated rear-side monitoring photodiode have been fabricated. When electrical isolation trench is not etched to active layer, the leakage current of monitoring photodiode is determined by the resistance between active region electrode and monitoring photodiode electrode, i.e. the resistance multiplied by the leakage current approximately equals to 0.8 V. In order to reduce the leakage current of monitoring photodiode, the electrical isolation trench must be etched into substrate layer. In addition, the electrical isolation trench has to be far enough away from the active region so that the superluminescent diode could achieve small spectral ripple.
MUSIC 알고리즘에 의한 레이더 반사단면적 계산법에 관한 연구
방천정(Tian Ting Pang),정중식(Jung-Sik Jeong),박성현(Sung-Hyeon Park),남택근(Taek-Kun Nam),임정빈(Jeong-Bin Yim),안영섭(Young-sup Ahn) 한국항해항만학회 2005 한국항해항만학회 학술대회논문집 Vol.3 No.-
레이더 물표에 대한 반사성능은 RCS(Radar Cross Section)에 의하여 결정된다. 형상이 비교적 간단한 물체에 대해서는 고유함수 접근법에 의하여 RCS를 정확하게 예측할 수 있으나, 해상물표와 같은 복잡한 물표에 대해서는 저주파 및 고주파 산란해석 기법 등을 이용하여 근사적인 해를 찾을 수 밖에 없고 계산적으로도 복잡하다. 본 연구에서는 수신신호의 파라미터를 정도 높게 추정할 수 있는 MUSIC 알고리즘을 이용하여 RCS 값을 근사적으로 구할 수 있는 알고리즘을 제안한다. 제안된 방법에서는 레이더 물표는 산란체의 링으로서 가정되고 레이더 물표로부터 반사된 신호들의 진폭은 통계적 성질을 지니고 분포하게 된다. 결과적으로 제안된 레이더 신호모델에 MUSIC 알고리즘이 적용되고, 레이더 물표의 RCS는 간단한 대수적인 방법으로 계산된다. The detectability of radar depends on RCS(radar cross section). The RCS for complex radar targets may be only approximately calculated by using low-frequency or high-frequency scattering methods, while the RCS for simple radar targets can be exactly obtained by applying an eigen-function method. However, the conventional methods for calculation of RCS are computationally complex. We propose an approximation method for RCS calculation by MUSIC algorithm. In this research, it is assumed that the radar target is considered as a ring of scatterers. The amplitudes of scatterers may be statistically distributed. As the result, the radar signal model is proposed to use MUSIC, and the RCS is calculated by a simple linear algebraic method.