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전승환(S.H. Jun),오진석(J.S. Oh),진강규(G.G. Jin),고성정(S.C. Ko),이종현(J.H. Lee) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
This paper deals with an development of screen technology for marine waste disposal. The conception of inverse inclined screen is introduced. For optimal solid-liquid separation the vibration frequency, vibration angle and vibration method are inquired. And the efficiency of proposed technology is proved through the field test.
이지영(J. Y. Lee),오진석(J. S. Oh),곽준호(J. H. Kwak),임명규(M. K. Lim),유병랑(B. R. Yu) 한국해양대학교 해사산업연구소 2003 海事産業硏究所論文集 Vol.14 No.-
This Paper is about the Impressed Current Cathodic Protection (ICCP) control and monitoring system, which brings protection against the corrosion of the ship's hull in the sea. Protection of the ship's hull can be made because iron's corrosion potential can be transferred to an immunity range when the ICCP system compels a protective current to be sent to the ship's hull. The ICCP system is composed of a power supply, anode, reference electrode and controller. AC sources from the ship's generator are converted to DC sources in terms of power supply, and a protective current is sent to ship's hull though anode. The controller operates to increase the protective current at the anode if the value of the detected potential is lower than that of the setting potential, but it operates to decrease it if the former is higher than the latter. The controller fully senses whether or not the detected potential is within a range of protection and then it is automatically controlled to increase or decrease the amount of protective current to be sent to the anode. The monitoring system with RS 232/485 communication is also studied in order to check the normal state of the system at a long distance, because an operator does not always watch over this system and thus the system cannot operate well because of his or her negligent management. I suggest that this system can accomodate a vessel's automation and will be very useful.
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/㎠.
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) 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.