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Nanoscale RRAM-based synaptic electronics: toward a neuromorphic computing device
Park, Sangsu,Noh, Jinwoo,Choo, Myung-lae,Sheri, Ahmad Muqeem,Chang, Man,Kim, Young-Bae,Kim, Chang Jung,Jeon, Moongu,Lee, Byung-Geun,Lee, Byoung Hun,Hwang, Hyunsang IOP Pub 2013 Nanotechnology Vol.24 No.38
<P>Efforts to develop scalable learning algorithms for implementation of networks of spiking neurons in silicon have been hindered by the considerable footprints of learning circuits, which grow as the number of synapses increases. Recent developments in nanotechnologies provide an extremely compact device with low-power consumption.</P><P>In particular, nanoscale resistive switching devices (resistive random-access memory (RRAM)) are regarded as a promising solution for implementation of biological synapses due to their nanoscale dimensions, capacity to store multiple bits and the low energy required to operate distinct states. In this paper, we report the fabrication, modeling and implementation of nanoscale RRAM with multi-level storage capability for an electronic synapse device. In addition, we first experimentally demonstrate the learning capabilities and predictable performance by a neuromorphic circuit composed of a nanoscale 1 kbit RRAM cross-point array of synapses and complementary metal–oxide–semiconductor neuron circuits. These developments open up possibilities for the development of ubiquitous ultra-dense, ultra-low-power cognitive computers.</P>
Self-Organized Process for Patterning of a Thin-Film Transistor
Byoung-Kwon Choo,Jin Jang,Gun Jeong Kim,Jung-Su Choi,Kyu-Chang Park 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
We studied the self-organized patterning of an insulator by using micro-contact printing (μ-CP) with an OTS (octadecyltrichlorosilane)-treated PDMS (polydimethylsiloxane) soft mold. An OTS monolayer on the patterned PDMS was formed by dipping it into an OTS solution. We transferred the OTS monolayer from the PDMS mold to a Cr layer on glass. The OTS monolayer changed the surface from hydrophilic to hydrophobic. We made self-organized PVP (cross-linked poly-4- vinylphenol) patterns by spin-coating of PVP. The PVP can be coated on the hydrophilic surface of Cr, but not on the OTS-treated Cr. Thus, we could get organic patterns without photolithography rapidly, and we could use organic patterns as etch barriers at a low cost. Using the surface energy difference and a self-organized process, we could make a 12-μm-wide organic line pattern easily. Our self-organized process can be used as a patterning method for organic insulators and semiconductors in organic TFTs (thin-film transistors) and as an etch barrier for sub-layer etching in non-organic device fabrication.no=8A
Kim, Bo Eun,Park, Sang Eun,Lee, Sang Wha,Lim, Jong Choo,Cho, Byoung Won,Lee, Joong Kee Trans Tech Publications, Ltd. 2009 Materials science forum Vol.620 No.-
<P>The porous TiO2 layer on the silicon surface not only acts as a buffer layer to relieve the strain associated with the volume expansion but also prevents the aggregation of the particles upon normal cycles of charging and discharging. The control of the optimum amount of catalyst has led to enhance the cycle performance of TiO2 coated silicon anode.</P>
이산화탄소 주입공 그라우팅 시멘트의 역학적 물성 및 파괴 거동
박미희 ( Mi Hee Park ),장찬동 ( Chan Dong Chang ),조영욱 ( Yeong Uk Jo ),추민경 ( Min Kyoung Choo ),염병우 ( Byoung Woo Yum ) 대한지질공학회 2011 지질공학 Vol.21 No.2
이산화탄소 지중저장을 위한 주입공의 안정성 및 누출제어에 주요 영향을 미치는 그라우팅 시멘트의 물리, 역학적 물성과 파괴 거동 특성을 실내실험을 통해 규명하였다. 물과 조강 3종 포틀랜드 시멘트를 네 종류의 질량비(각각 0.4, 1, 2, 3)로 배합한 시편을 제작하여 시험하였다. 그라우팅재의 제반 물리, 역학적 물성은 물/시멘트 배합비 0.4와 1 사이에서 급격하게 변화하며 전체적으로 물/시멘트 배합비가 증가함에 따라 공극률은 증가, 탄성파속도, 탄성계수, 압축, 인장강도 등은 감소하는 체계적인 변화양상을 보였다. 특히 일련의 삼축압축실험에서는 시편 성형시 물/시멘트 배합비와 시편에 작용하는 구속압조건에 따라 취성파괴와 연성변형의 경계가 명확히 구분되었다. 규명된 물성 및 파괴거동은 이산화탄소 주입공 주변의 암반응력과 주입압 조건에 따라 발생할 수 있는 그라우팅재의 일차적 변형, 파괴, 균열 등의 모델분석에 주요 입력인자로 활용될 수 있을 것으로 기대한다. We conducted laboratory experiments to determine the physical and mechanical properties, and the failure behaviors, of cements for use as grouting material in a CO2-injection borehole. Samples with four different ratios of water to cement mass (0.4, 1, 2, and 3) were tested. The analyzed properties (porosity, sonic velocity, modulus, and compressive and tensile strengths) varied systematically as a function of the ratio of water to cement (w/c), showing a sharp change between w/c ratios of 0.4 and 1. Triaxial compression tests revealed a clear boundary between brittle and ductile failure depending on the w/c ratio and confining pressure. The present results can be utilized as input parameters for numerical models to understand the initial deformation and failure behavior of grouting cements in a CO2-injection borehole.