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범죄예방을 위한 CCTV 영상 기반의 실시간 안면인식 시스템
김현빈(Hyun-Bin Kim),최낙훈(Nakhoon Choi),강지수(Ji-Soo Kang),임소현(So-Hyun Lim),김희열(Heeyoul Kim) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.8
In modern society, the rate of sexual offenses continues to increase. In particular, since the recidivism rate of sex offenders is high, the institutional or social need to prevent recurrence is gradually increasing. In this paper, we propose a real-time criminal face recognition system in CCTV video for crime prevention. This is a series of processes to prevent sexual offenses and re-offenses of sex offenders through artificial intelligence-based facial recognition. However, there is a problem in practically utilizing facial recognition technology. The facial recognition system consists of a detection step for finding a face in an image and a matching step for calculating the degree of matching with the detected face. It requires a high computational cost compared to a single operation. Therefore, this study shows higher recognition accuracy by using the AB-box method, which reduces the processing time through vectorization when detecting a face. Also, we reduce computational cost during real-time operation and increase the size of the detected facial image afterward.
김현빈 ( Hyun Bin Kim ),명현 ( Hyun Myung ),김기홍 ( Ki Hong Kim ) 한국감성과학회 1999 춘계학술대회 Vol.1999 No.-
최근 PC의 멀티미디어 성능이 향상되고 디지털 신호처리 기술이 발달함에 따라 복잡한 수식과 방대한 정보처리가 요구되는 입체음향(3D Sound) 처리를 PC상에서도 구현하는 것이 가능하게 되면서, 입체음향에 대한 사용자의 관심이 고조되고 있다. 입체음향을 이용한 청각효과는 3D 영상의 시각효과에 못지 않은 강한 인상을 줄 수 있는 수단으로써 인정받고 있어 게임, 가상현실, 멀티미디어 컨텐트 등에서 사용자의 몰입감과 체험 효과를 최대한을 증대시킬 수 있는 새로운 수단으로 활용되고 있고, 이와 관련하여 입체 음향에 대한 연구와 개발이 국내외에서 활발히 진행 중에 있다. 본 논문에서는 2채널 방식의 입체음향 기반기술과 최근의 입체음향 기술개발 동향을 살펴본다.
GaN HEMT기반 차량용 1.5kW급 고효율 LDC 구현
김현빈(Hyun-Bin Kim),김종수(Jong-Soo Kim) 대한전기학회 2020 전기학회논문지 Vol.69 No.2
This paper deals with how to maximize the efficiency of LDC for xEV by using GaN HEMT and improving control method. First, the characteristics of GaN HEMT are analyzed in detail and the considerations for applying them instead of conventional silicon MOSFETs to the primary side of LDC are described in detail. Second, the possibility of a phase shedding control scheme is presented to improve the low light-load efficiency due to the high step-down ratio of the LDC. Finally, the analysis results of considerations applying GaN HEMT-based synchronous rectifier instead of conventional fast recovery diodes to the secondary side of LDC are presented. The feasibility of the proposed efficiency maximization strategies is verified through a 1.5kW LDC laboratory prototype. The experimental results show high efficiency of more than 95% from 150W load condition and the maximum efficiency of 96.2%.
김현빈(Hyun Bin Kim),윤대식(Tae Sick Yoon),N. D. Ha(N. D. Ha),김종오(Chong Oh Kim) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.1
The influence of O₂ partial pressure on saturation magnetization, coercivity, anisotropy field and effective permeability(over 1 ㎓) of as-deposited Co-Fe-Al-O thin films, which were fabricated by RF magnetron reactive sputtering method, were investigated. The Co_(69.9)Fe_(20.5)A_(14.4)O_(5.2) thin film fabricated at O₂ partial pressure of 4% exhibits the best magnetic softness with saturation magnetization (4πMs) of 18.1 kG, coercivity (Hc) of 0.82 Oe, anisotropy field (Hk) of 24 Oe, and effective permeability (μeff) about 1,024 above 1 ㎓. The electrical resistivity of Co-Fe-Al-O thin films were increased with increasing O₂ partial pressure, the electrical resistivity of Co_(69.9)Fe_(20.5)A_(14.4)O_(5.2) thin film with the best soft magnetic properties was 560.7 μΩ㎝. Therefore, It is assumed that the good soft magnetic properties of Co_(69.9)Fe_(20.5)A_(14.4)O_(5.2) thin film results from high electrical resistivity and large anisotropy field.