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이홍찬(H. C. Lee),장지호(J. Chang),조영래(Y.R. Cho),이상태(S.T. Lee),오진석(J.S. Oh),이성근(S.G. Lee),김윤식(Y.S. Kim),K. Ando 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
In this paper, in order to utilize efficient green emission property (Te-cluster emission) in visible light emitting devices (LEDs and LDs), the characteristics of ternary compounds (ZnSSe:Te) have been stuided, focussing on the control of the lattice-matched condition. Efficient and long-lived green LEDs using Te-cluster emission band at room temperature were successfully fabricated. The lifetime characteristics of the ZnSSe:Te-based DH-LEDs shows above 1,500 ills operated at 3 A/㎠.
SrS:Ce 박막 EL 소자의 열화특성에 관한 Rb 첨가의 영향
이상태(S.T. Lee),허성곤(S.G. Heo),이홍찬(H.C. Lee) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
Effects of Rb doping on the aging characteristics have been studied in SrS:Ce thin film electroluminescence (EL) devices. It has been found that a luminance saturation and decrease of an EL efficiency are suppressed by Rb doping. For the SrS:Ce,Rb device, a luminance and an efficiency after 1024 h of aging at 1 ㎑ drive maintain at about 70% and 80% of the initial values, respectively.
하기만(K.M Ha),김윤식(Y.S Kim),이성근(S.G Lee),오진석(J.S Oh),이홍찬(H.C Lee) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The 108 multiplexed Beam Position Monitor (BPM) electronic modules and 2 digital BPM modules are installed to diagnose the beam position around Pohang Light Source (PLS) storage ring. To provide high quality beam to beam users, the stable orbit is maintained through the orbit feedback controlled correction Power Supply (PS) and steering PS after precise readout of the beam position. The multiplexed BPM analog output signal is scaled about the order of Volt/mm. To maintain the sub-micron orbit, a few hundred measurements should be done through analog and digital filter. In this paper, PLS Control/Measurement system are introduced for beam operation to measure sub-micron beam position and the new beam position monitoring hardware with the high resolution (>18-bit) is presented by using of analog/digital filter. Also the measurement data of the advanced Digital BPM is presented.
김윤식(Y.S Kim),하기만(K.M Ha),이성근(S.G Lee),오진석(J.S Oh),이홍찬(H.C Lee) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
Digital power supply controller using the Digital Signal Processor (DSP) and Field Programmable Gate Array (FPGA) has been developed over the years. Recently, full digital power supply controller has been studied and tested. A new digital controller is designed under 3U euro-standard size and provides quiet better overall performance characteristics than the standards of ± 5 ppm short-term stability (< 1 min) and ± 25 ppm long-term stability (< 12 hours). The digital controller adopted digital PID current control algorithm with single pole digital filter and feed-forward voltage ripple compensation loop. By implementation of the digital controller, it has the ability of high step resolution (150 ps) Digital Pulse Width Modulation (DPWM) for FET or IGBT switch drivers and high resolution (18-bit, 400 kSPS/2 MSPS) analogue to digital conversion for current and voltage signal measurement. In this paper, the hardware and software structures of the developed digital controller and experimental results of digital power supply are described.
하기만(K.M Ha),김윤식(Y.S Kim),이성근(S.G Lee),오진석(J.S Oh),이홍찬(H.C Lee),김창국(C.K Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
Versa Module Eurocard bus (VME) system은 고도의 안정성과 신뢰성을 요구하는 제어분야에 널리 사용되고 있다. 포항가속기연구소에는 다양한 전원장치의 실시간 제어와 신호처리를 위해 VME system을 사용한다. 주프로세서는 모토롤라의 74xx 시리즈의 power pc를 사용하고 있으며 데이터버스는 최대 64-비트를 지원한다. 제어를 위해서는 IP모듈을 사용하였고 PS는 fiber 미디어를 통해 5 Mbps로 고속통신이 이루어진다. 본 논문에서는 포항가속기연구소의 다중전원장치용 고속제어시스템의 하드웨어의 구조와 제어소프트웨어에 대하여 기술한다.