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폐 LCD 유리를 이용한 발포유리의 다공성 및 흡음 특성에 관한 연구
윤건수,이철태,장재민 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
국내 흡음재로 널리 쓰이는 것으로는 유리섬유(glass wool)와 암면(rock wool)이 있다. 이들 재료는 생산성과 경제성이 뛰어나지만 대기 노출 시 풍화작용에 의한 미립자가 발생하며, 폐기처리 시 재사용 및 소각처리가 어려운 단점이 있다. 뿐만 아니라 섬유간의 결합력이 약하여 운반 및 취급 시 파손될 우려가 있고, 습기에 의해 인체에 직접 접촉하게 되면 자극 또는 가려움증을 유발하는 등 인체 유해성 여부로 환경적 제약을 받고 있다. 따라서 폐LCD유리를 이용한 발포체는 친환경적이며 내구성 및 경제성을 고려한 새로운 흡음재의 대체 재료로 사용 될 수 있다. 이러한 발포체가 흡음 기능을 갖기 위해서는 열려진 기공을 통하여 기공 내에서 소리 에너지가 열에너지로 소실되는 현상을 이용하여 소음이 제거되기 때문에 발포체의 열려진 기공의 여부가 중요하다. 따라서 본 연구에서는 폐LCD유리의 TGA 및 EDAX를 이용한 성분분석과, 발포체의 발포과정에서 열처리 및 발포제의 조작변수를 통해 열린 기공을 생성하여, Archimedes 원리를 이용한 액중칭량법에 따른 발포체의 건조질량 및 수중질량의 측정을 통해 열린 기공과 닫힌 기공 비율을 조사하였다.
김민성,윤건수,장지혜,김려연,하판봉,김영희,Kim, Min-Sung,Yoon, Keon-Soo,Jang, Ji-Hye,Jin, Liyan,Ha, Pan-Bong,Kim, Young-Hee 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.10
본 논문에서는 Magnachip $0.18{\mu}m$ 공정을 이용하여 PMIC용 32bit eFuse OTP IP를 설계하였다. eFuse 링크 아래에 N-Well을 두어 프로그램시 eFuse 링크와 p-기판의 VSS가 단락되는 문제점을 해결하였다. 그리고 디코딩된 WERP (WL Enable for Read or Program) 신호가 eFuse OTP 메모리로 바로 입력되는 경우 듀얼 포트 eFuse OTP 메모리 셀의 RWL (Read Word-Line)과 WWL (Write Word-Line)을 선택적으로 활성화해 주는 WL 구동회로를 제안하였다. 또한 BL 프리차징 회로에서 delay chain을 제거하여 제어회로의 레이아웃 면적을 줄였다. 메모리 테스트 장비를 이용하여 제작된 94개의 샘플 die를 측정한 결과 5.5V의 프로그램 전압에서 100%의 수율을 얻었다. In this paper, we design a 32-bit eFuse OTP memory for PMICs using MagnaChip's $0.18{\mu}m$ process. We solve a problem of an electrical shortage between an eFuse link and the VSS of a p-substrate in programming by placing an n-well under the eFuse link. Also, we propose a WL driver circuit which activates the RWL (read word-line) or WWL (write word-line) of a dual-port eFuse OTP memory cell selectively when a decoded WERP (WL enable for read or program) signal is inputted to the eFuse OTP memory directly. Furthermore, we reduce the layout area of the control circuit by removing a delay chain in the BL precharging circuit. We'can obtain an yield of 100% at a program voltage of 5.5V on 94 manufactured sample dies when measured with memory tester equipment.
이지훈,임준억,윤건수,박현거,이우창 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.3
Quasi-coherent mode (QCM) is a widely studied ion-gyroscale micro-instability with characteristics similar to those of trapped electron mode in tokamak plasmas. The effect of the normalized collisionality on the QCM amplitude is quantitatively studied in low-confinement plasmas assisted by electron cyclotron resonant heating in the KSTAR machine using the microwave imaging reflectometer (MIR). To study the evolution of the QCM amplitude by the increased collisionality, coherence lengths are obtained from coherence spectra of signals from multiple poloidal or radial channels of the MIR system. Compared to the other definition of the QCM amplitude ‘the energy of QCM’ extracted from power spectrum of MIR signals, the coherence length is more sensitive to small-amplitude fluctuations, providing more detailed dependence of the mode amplitude on the collisionality especially near the critical level for full suppression.
Interpretation of the Electron Cyclotron Emission Signal from Optically Marginal Plasmas
Muhammad Khawar Ayub,윤건수,이우창,Hyeon K. Park 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.3
The interpretation of electron cyclotron emission (ECE) signal from the optically marginal region of magnetized plasma is presented. The density and the temperature fluctuations associated with the edge localized modes (ELMs) observed in the KSTAR tokamak are estimated by assuming an ELM filamentary structure as a flux tube bulges out like a ballooning mode instability. Synthetic ECE signals from the rotating ELM are calculated based on the measured electron temperature profile and an assumed electron density profile constrained by the measured line-averaged density, yielding an 0.02 relative fluctuation level in agreement with the experimental observations. The measured ECE signal is nearly in phase with the density modulation associated with the rotating ELM. This implies that the ECE signal corresponding to the ELM filaments has a significant contribution from the density fluctuations.
Experiment and simulation of tearing mode evolution with electron cyclotron current drive in KSTAR
김경진,나용수,김민화,Y.M. Jeon,K.D. Lee,J.G. Bak,M.J. Choi,윤건수,S.G. Lee,S. Park,J. H. Jeong,L. Terzolo,D.H. Na,M.G. Yoo,KSTAR Team 한국물리학회 2015 Current Applied Physics Vol.15 No.4
The tearing mode (TM) plasma instability was observed in low confinement (L-mode) plasmas when non-axisymmetric magnetic perturbation (MP) was applied using external coils during 2011 campaign of KSTAR. Based on the collected information of the magnetic island location in a plasma, a discharge was designed for suppression of a (2,1) TM mode by adjusting electron cyclotron (EC) launcher angles to the estimated island position. Here, the (m,n) notation describes the poloidal mode number and the toroidal mode number of the TM, respectively. The discharge is analysed with experimental observations and numerical simulations. Mirnov coil (MC) arrays and electron cyclotron emission (ECE) are used for analysis of the island width and the location as well as the mode number. The EC deposition and its alignment with the island are estimated by X-ray imaging crystal spectroscopy (XICS) and ECE measurements. An integrated numerical system is employed for modelling of this discharge to analyse a temporal evolution of the mode activity by integrating plasma equilibrium, transport, heating and current drive, and the magnetic island evolution, in a self-consistent way. The effect of EC current drive is discussed by comparing with another TM discharge but without ECCD. Some possibilities for classifying this mode to neoclassical tearing mode (NTM) and stabilisation effect of ECCD are suggested based on the experimental observation and the simulation results.