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자동차 이중전원 시스템을 위한 새로운 양방향 ZVS CUK 컨버터
이성룡,이수원,고성훈,문제민 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
Currently, to overcome the limit of a 14V power supply system and to enhance the stability of this system high and to make the fuel efficiency better, a research development of a 42V power supply system is actively the progress. As an intermediate step to change into an unity power supply system, a 42V/14V dual power supply system uses a DC/DC Converter as one of structure elements. Considering the main electric power sources in the next generation of the car is a 42V system, a 14V power supply system has advantages as follows : to be managed efficiently and to increase the redundancy at start, to jump start with any vehicles, etc. We need the introduction of a bi-directional converter that can flow the energy each other in a dual 42V-12V system. This paper proposed the ZVS bi-directional CUK DC/DC converter which decrease the weight with the size of the DC/DC Converter and minimize the loss when the switching happen. In this paper, a circuit design method and an action principle of the circuit was proposed. To verify the proposed circuit, a comprehensive evaluation with theoretical analysis, simulation results is presented.
LED 교통 표지판용 독립형 태양광 발전 시스템에 관한 연구
이성룡,이강명,고성훈 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
The development of the solar energy is necessary since th future alternative energies that have no pollution and no limitation are restricted. PV(Photovoltaic) power generation are an advantage of unlimited and unpolluted amount energy resource. This paper deals with stand-alone PV power generation system with charge and discharge controller for the LED road sign. Main power source of PV system are generally solar cell and battery. Therefore PV system can be classified into variable types in accordance with connection type between battery and solar sell. Mainly used on them is direct connection type which has advantage such as simple structure and simple controller. This paper proposed a implementation of the stand alone PV power generation system for a LED road sign with one-chip microprocessor. To verify the proposed power supply, the detail simulation and experiment results are shown so that operating characteristics are verified by experiment with laboratory in this paper
Power Amp.용 3KW급 ZVT PFC 컨버터 설계
이성룡,전칠환,권순신 군산대학교 정보통신기술연구소 2000 情報通信技術硏究論文集 Vol.4 No.-
A new ZVT PFC for using 3[KW] power amplifier is proposed. Generally, the single phase diode rectifier has been widely used in the SMPS of the conventional power amplifier. But this rectifier has occurred some problems which are the input power factor and current harmonics. To solve the above problems, in this paper, two topology is adopted. The one is the boost type PFC for improving the input power factor. The other is the ZVT resonant circuit for reducing the switching loss and stress. In this paper, the proposed topology is analyzed and designed to built the ZVT PFC for using 3[KW] power amplifier. In order to verify the circuit validity, finally, the PSPICE simulation and experimental results are presented.
치아 교환기 어린이에서 근단변위부분층 판막술을 이용한 하악 거대 협소대의 처치
이성룡,오유향,이창섭,이상호,이난영,Lee, Sung-Ryong,Oh, You-Hyang,Lee, Chang-Seop,Lee, Sang-Ho,Lee, Nan-Young 대한소아치과학회 2004 大韓小兒齒科學會誌 Vol.31 No.4
영구치의 맹출지연이 발생하는 원인은 다양하다. 유치의 만기 잔존과 조기 상실, 과잉치나 치아종과 같은 이형물의 존재등과 같이 비정상적인 경조직 인자에 의해 발생할 수 있고, 치은 판개 조직(opercula)과 같은 상부 치은 조직의 섬유성 비후나 소대의 과증식과 같은 연조직성 인자에 의해 발생하기도 한다. 영구치의 맹출지연시의 공간의 상실 및 영구치의 비정상적인 맹출 그리고 그에 따른 치열궁의 비대칭과 같은 교정적 문제와 대합치의 정출 등에 의한 교합적인 문제 등이 발생할 수 있어 조기에 진단하여 처치하는 것이 중요하다. 본 증례에서는 12세 남자아이가 충치가 많고 치아가 나오지 않는다는 것을 주소로 내원하여 진단한 결과, 하악 좌측 소구치들이 맹출하지 못하고 매복되어 있는 것을 알 수 있었다. 원인은 맹출 공간이 부족하였고 동시에 거대 협소대가 치아의 맹출을 방해하는 것으로 파악되었다 이에 대한 처치로 우선 공간을 획득하고 난 후, 부착치은의 회복과 맹출 촉진을 위해 근단 변위부분층 판막술을 시행하였다. The mandibular buccal frenum becomes a problem when its attachment is too close to the marginal gingival. Heavy buccal frenum mucogingivally results in insufficient attached gingiva, inadequate vestibular depth and also difficulty in eruption of mandibular premolar. The aim of this study is to demonstrate the effectiveness of apically positioned partial-thickness flap as adequate method in order to remove heavy buccal frenum and expose impacted teeth. The author presents the case of a 12-year-old boy. He had problems that was prolonged eruption of #34, #35 due to high pull buccal frenum. After space regaining for normal eruption of #34, #35, we performed apically positioned partial-thickness flap on #34, 35 area. As a results, we confirmed that eruption of #34, #35 has been processed normally And vestibular depth, position of buccal frenum and width of attached gingival was within a normal range. Decrease in muscle pull, adequate width of attached gingiva and increased vestibular depth can be expected from this treatment.