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빠른 부하 전류 응답속도를 갖는 완전 집적된 스위치드 커패시터 DC-DC 변환기
이정윤(Jeong-Yun Lee),백동현(Donghyun Baek) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
This paper describes a fully integrated switched-capacitor DC-DC converter for fast load transient response in 0.35 um CMOS technology. The proposed implementation uses digital switched-capacitor size modulation and analog pulse frequency modulation. Fast load transient response is achieved by low PI compensation. The converter achieves a maximum efficiency of 80% for 3.3V input voltage and 1.5V output voltage.
길민식(Ghil, MinSik),백동현(Baek, DongHyun),박남규(Park, Namkyu) 한국화재소방학회 2013 한국화재소방학회 학술대회 논문집 Vol.2013 No.춘계
본 연구는 u-IT 융합기술을 접목하여 옥내 외 화재발생시 조기발견 및 탐지가 용이하다. 아울러 저비용과 고효율로 화재에 신속한 대응이 가능하며 옥외 환경에 적합한 옥외형 화재경보시스템의 성능 및 신뢰성 평가에 관한 것이다. 성능시험, 기능시험, 화염시험 및 옥외방치시험을 3개월간 실시한바 양호하였고 온도변화 성능시험도 <TEX>$-30^{\circ}C{\sim}70^{\circ}C$</TEX>에서 양호하였으며 EMI/EMS 시험도 적합하였다. 또한 화염검출거리 증가와 대기전원의 4시간 증가, 동작시간을 3일까지 가능하게 하였으며 센서뿐만아니라 영상으로 상황을 인지하는데 적합하였다.
IT중소기업 정부자금 지원정책 성과 평가를 위한 DEA/(AR-I, ARGM) 모형 설계 및 민감도 분석
박성민(Sungmin Park),김헌(Heon Kim),백동현(Donghyun Baek) 대한산업공학회 2008 대한산업공학회지 Vol.34 No.2
Recently, it has been strongly required to establish a systematic and sustainable performance investigation and evaluation framework on governmental funding projects for IT small and medium-sized enterprises. In this paper, Data Envelopment Analysis (DEA) models are adopted for performance evaluation on governmental funding projects for IT small and medium-sized enterprises. A new data structure is proposed for the DEA performance evaluation. Generally, in using DEA models, DEA multipliers restriction is critical to achieve the reliability of DEA optimal solutions. Based on the outputs and inputs considered in this study, Acceptance Region (AR) constraints are generated and incorporated into the DEA models so as to improve the reliability of DEA efficiency scores. Associated with AR Type I (AR-I), AR Global Model (ARGM) constraints, DEA/ (AR-I, ARGM) models are designed and then sensitivity analysis follows investigating the robustness of DEA efficiency scores relating to AR constraints adjustment. Finally, a performance evaluation is illustrated regarding governmental direct funding projects from Ministry of Information and Communication (MIC) in Korea where each project unit (i.e. Decision Making Unit (DMU)) is determined whether it is efficient or not. By using DEA/(AR-I, ARGM) models designed in this paper, robustly efficient DMUs are gradually identified according to the successive AR constraints adjustment. Among 25 DMUs, results show that 6 DMUs such as B, E, G, Q, S ,Y are determined as robustly efficient against AR constraints intermediate adjustment.
가변 피드포워드 Gm을 이용해 적응형 Quiescent 전류 제어 기법을 적용한 출력 커패시터가 없는 LDO 레귤레이터
성은택(Eun-Taek Sung),박상용(Sangyong Park),이승기(Seung-Gi Lee),백동현(Donghyun Baek) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
An adaptive quiescent-current controlled LDO using a variable feedforward Gm cell is proposed. For a light load, the feedforward Gm increases and moves the non-dominant pole to a higher frequency. For a heavy load, Gm decreases to enhance the maximum efficiency of the LDO. The proposed LDO achieves a maximum current efficiency of 99.98 % with a worst case phase margin of 61.2 degree.