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강호현,류강열,서인영 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
본 논문은 태양광발전시스템에서 인버터의 운영효율증대을 위해 사용되는 병렬운전의 실증시험결과 및 분석에 관한 내용이다. 낮은 부하영역에서 발전 시 다수의 태양광 module을 병렬 연결하여 인버터의 운전점을 높이는 병렬운전기법에 대하여 분석하고 실제 1.6㎿ 설비용량의 태양광발전소에서 당사에서 개발된 250㎾ 태양광인버터의 실증운전자료를 통하여 그의 효용성과 타당성에 대하여 분석한다.
짐벌 카메라 각도 제어와 객체 인식을 사용한 UAV 자동착륙 시스템
강호현,신수용 한국통신학회 2023 韓國通信學會論文誌 Vol.48 No.2
본 논문은 짐벌 카메라의 각도 제어 및 딥러닝 기반 객체 인식을 활용한 UAV 자동 착륙 시스템을 제안한다. UAV에 장착된 카메라를 사용하여 딥러닝 기반 객체 인식을 통해 목적지 착륙 패드를 둘러싸는 표시 영역(Bounding box)을 기준으로 운용 중인 UAV의 위치를 제어하도록 한다. 제안된 방식에서는 별도의 카메라가 필요없이 기존의 UAV 임무 장비 중의 하나인 짐벌 카메라를 사용해 카메라 각도를 하단을 바라보게끔 제어하고, UAV에 장착된 컴패니언 컴퓨터를 사용해 UAV을 제어한다. 제안된 방식에서 딥러닝 기반 객체인식은 Yolo v4 tiny를 사용했고, 드론제어를 위해 ROS를 사용하여 구현되었고, 성능 평가를 위해 착륙 지점과 착륙 패드 간의거리를 측정하였고 모의실험과 실제 실험을 통해 효율성을 입증하였다.
이기종 네트워크 환경에서의 하이브리드 멀티미디어 원격진료시스템의 설계
강호현,이민규,김동근,유선국 대한의료정보학회 2006 Healthcare Informatics Research Vol.12 No.3
Objective: The advancement of computing capabilities and increase of available network bandwidths have resulted in an emergency telemedicine services which can provide high quality medical services. However, existing telemedicine systems mainly have offered a one to one communication configuration instead of a multi-connection configuration. Therefore, we suggested a hybrid multimedia telemedicine system to support the multi-patients services in wired and wireless (heterogeneous) network environments. Methods: We designed the hybrid multimedia telemedicine system consisting of 4 sub-systems, a patient system, a doctor system, a emergency monitoring system, and a multi-control server system. The patient system could deliver multimedia data of a patient to the emergency monitoring system or to the doctor system according to link configuration. The link configuration was decided as 'Flowing', or 'By-passing' in accordance the connection type of patient systems or doctor systems. At this time, as the multi-control server system considers the hybrid network, it monitored the patient's multimedia data and the state of emergency telemedicine services. Results: The hybrid multimedia telemedicine system including the multi-control server system performed the best communication configuration over heterogeneous networks. This system achieved high quality emergency telemedicine services through dynamic wired and wireless networks at real-time. Conclusion: This study represented a hybrid multimedia telemedicine system over heterogeneous networks in emergency cases. We expected that the designed system could provide not only the high quality services, tele-diagnosis and tele-consultation, but also the effective emergency telemedicine services to multi-patients in the heterogeneous network environments. (Journal of Korean Society of Medical Informatics 12-3,239-249, 2006)
플로팅 커패시터를 갖는 이중 인버터를 위한 향상된 데드 타임 보상 기법
강호현,장성진,이형우,황준호,이교범 한국전기전자학회 2022 전기전자학회논문지 Vol.26 No.2
This paper proposes an advanced dead-time compensation method for dual inverter with a floating capacitor. The dual inverter with floating capacitor is composed of double two-level inverters and a bulk electrolytic capacitor. The output voltage of the dual inverter is dropped by the conduction voltage of the power semiconductors. The voltage drop and dead-time cause the fundamental and harmonic distortions of output currents. When supplied power for OEW-load is low, the dual inverter operates as single inverter for effective operation. The dead-time compensation method for the dual inverter operated as single inverter is needed for reliability. The proposed method using band pass filter in this paper compensates dead-time, dead-time error and changed voltage drop error of power semiconductors for the dual inverter and dual inverter operated as single inverter. The effectiveness of the proposed method is verified by simulation results. 본 논문은 플로덩 커패시터를 갖는 이중 인버터의 향상된 데드 타임 보상 기법을 제안한다. 플로팅 커패시터를 갖는 이중 인버터 는 2-레벨 단일 인버터보다 전력 반도체가 6개가 추가된다. 전력 반도체의 수가 증가로 이중 인버터의 출력 전압은 추가된 전력 반 도체의 도통 전압만큼 감소되며 출력 전류 품질은 전력 반도체에 의한 전압 강하와 데드 타임에 의해 저하된다. 본 논문에서 제안하 는 기법은 이중 인버터의 데드 타임 및 전력 반도체의 도통 전압을 보상하여 전류 품질을 개선하고 추가적인 대역통과 필터를 이용 한 고조파 보상 기법을 통해 데드 타임과 도통 전압 보상에 대한 오차를 추가 보상한다
강호현,김성림,유선국 대한의료정보학회 2005 Healthcare Informatics Research Vol.11 No.3
Objective: According to development of web service technology and mobile device supply, mobile web service becomes an essential element of ubiquitous healthcare. But there are many constraints for offering mobile web services on mobile devices. Hence, this paper propose optimal system supplying web services about medical information in wired /wireless network according to resources of device. Methods: Proposed system consists of web server, database, desktop subscriber, mobile device and mobile context server. When a mobile device requires the web service, a mobile context server rewrites and offers the equivalent contents provided from web server to suit the requiring device's resource. Our proposed system services the same medical information after its recomposition as the network and devices of user. Results: The medical staff may require patient information in wired/wireless environment, web server and mobile context server supports their correct judgment and expeditious response by servicing optimized data of the patient according to the requiring device. Conclusion: Proposed system designed the wired/wireless integrated medical information system using web service and mobile web service as the bases of ubiquitous healthcare system. Not only for web service in wired network, to provide the optimal web service in wireless network, we should know the limited resource of mobile devices and appropriately divide the web contents of wired network to fit the mobile device's screen. The future research needs dynamic division of screen according to extension of medical information data. (Journal of Korean Society of Medical Informatics 11-3,279-290, 2005)
연료전지를 이용하는 비도로용 자동차를 위한 전력변환시스템에 관한 연구
강호현(Hohyun Kang),김왕래(Wang-Rae Kim),최우진(Woojin Choi),전희종(Hee-jong Jeon) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper a power conditioning system suitable for the fuel cell powered off-road vehicle is proposed. The proposed system employs a Proton Exchange Membrane Fuel Cell stack combined with boost converter, a super capacitor module combined with bi-directional buck-boost converter, a 4-quadrant DC chopper and a permanent magnet DC motor. The momentary overload condition occurring during the motor starting is handled by the energy stored in the supercapacitor module. Also, the regenerative energy can be stored in the supercapacitor module by operating the system in either buck or boost mode. This capability gives the system designer the higher flexibility in designing the system and assures the lower cost of the system. The validity and feasibility of the proposed system is proven by the computer simulation.