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조봉관(Cho Bong-Kwan),류상환(Ryu Sang-Hwan),백종현(Baek Jong-Hen),조보형(Cho Bo-Hyung) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Presently metro in our country has higher rate of passengers as a public transportation of urban area than other transportations. And road is under very restrictive condition to be expanded in many aspects because the streets are completely choked. Therefore increase of capacity in metro and reduction of headway has been seriously required and utmost efforts has been taken by related fields to meet the requirements. The concept of CBTC system came out from this background. CBTC system can be implemented to detect the train location without using the track circuits. It has many advantages in aspects of signalling equipments build-up and maintenance. This study investigated examples of radio communication system and applicable standard norms in other countries. And it also reviewed the suggestion for the establishment of radio frequency and radio network to be considered for application train control system by radio under Korean metro environment.
보조권선을 사용한 자동차 헤드라이트용 고압방전등 안정기
이규찬(Kyu-Chan Lee),조보형(Bo. H Cho) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A new scheme of the automotive High Intensity Discharge (HID) lamp ballast systems IS proposed. Proposed scheme is consisted of the high frequency DC-DC converter and low frequency DC- AC inverter as same as conventional HID ballast system. But this system separates ignition voltage from dc link voltage, which results to use the lower voltage rating power devices for HID lamp ballast system compared with conventional system As a result, proposed system has a lower cost and higher efficiency.
위상 제어를 통한 비대칭 하프 브릿지 플라이백 컨버터의 다중 출력에 관한 연구
현병철(Byeong Cheol Hyeon),조보형(Bo Hyung Cho) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
본 논문에서는 PWM(Pulse Width Modulation)과 PFM(Pulse Frequency Modulation), PD(Pulse Delay)을 이용한 다중 출력 비대칭 하프 브릿지 플라이백 컨버터를 제안 한다. 제안된 회로는 기존 위상 제어 방식의 다중 출력 구성과 달리 PWM-PD에 PFM 방식을 이용하여 PWM-PD 방식에 비해 동작 영역이 확장 되어 넓은 입력 전압 및 부하 변동 범위를 가진다. 또한 제안된 회로에서는 변압기의 다중 권선의 조합을 통해 부가적인 변압기 및 인덕터, 직류 차단 커패시터 없이 새로운 출력단을 구성하여 고밀도 저비용 구현이 된다. 논문에서는 제안된 회로의 동작 및 주요 파형을 설명하고 24V/10A, 12V/5A, 5V/10A의 출력을 가지는 350W 하드웨어 실험을 통해 성능을 검증 하였다.
마이크로 에너지 그리드 기술 적용 통합에너지운영센터 공간 계획에 관한 기초 연구
오현인(Oh, Hyun-In),조보형(Cho, Bo-Hyung) 한국실내디자인학회 2013 한국실내디자인학회 학술대회논문집 Vol.15 No.1
A new urban paradigm “green city” has emerged with the incorporation of smart grid technology into urban infrastructure. As an integral part of the green city, the integrated energy operations center is an information processing and service platform for the efficient use and management of energy. The next-generation energy technology “micro energy grid” is characterized as a combination of technologies for smart grids, power decentralization and use of final energy (i.e. heat, electricity, gas, etc.) and provides a total energy solution that can underlie the realization of energy-sufficient cities (and buildings) by ensuring the efficiency of energy production and consumption. The present study aims to propose a space plan for the integrated energy operations center based on communication infrastructure and interfaces for such micro energy grids. In addition, this study attempts to suggest a more advanced energy operations center for automation technologies and services with the application of the micro energy grid technology to a real-world building (test bed).