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RISS 인기검색어
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- 저자 : Y.L. Pei (검색결과 3 건)
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Y. Li,Y.L. Pei,R.Q. Hu,Z.M. Chen,Y. Zhao,Z. Shen,B.F. Fan,J. Liang,G.Wang 한국물리학회 2014 Current Applied Physics Vol.14 No.7
We have investigated the electrical performance of amorphous indiumegalliumezinc oxide (a-IGZO) thin-film transistors with various channel thicknesses. It is observed that when the a-IGZO thickness increases, the threshold voltage decreases as reported at other researches. The intrinsic field-effect mobility as high as 11.1 cm2/Vs and sub threshold slope as low as w0.2 V/decade are independent on the thickness of a-IGZO channel, which indicate the excellent interface between a-IGZO and atomic layer deposited Al2O3 dielectric even for the case with a-IGZO thickness as thin as 10 nm. However, the source and drain series resistances increased with increasing of a-IGZO channel thickness, which results in the apparent field-effect mobility decreasing. The threshold voltage shift (DVth) under negative bias stress (NBS) and negative bias illumination stress (NBIS) were investigated, also. The hump-effect in the sub threshold region under NBS and threshold voltage shift to negative position under NBIS were enhanced with decreasing of a-IGZO channel thickness, owing to the enhancement of vertical electrical field in channel.
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Yu, J.,Wang, L.,Lai, X.,Pei, S.,Zhuang, Z.,Meng, L.,Huang, Y.,Li, Q.,Lu, W.,Byun, J.H.,Oh, Y.,Yan, Y.,Chou, T.W. Pergamon Press ; Elsevier Science Ltd 2015 Carbon Vol.94 No.-
In spite of the recent rapid growth in stretchable electronic device research, efforts have been mainly focused on material selection, device geometric design and short-term performance characterization. The present research focuses on the long-term durability of electromechanical and electrochemical performance of buckled carbon nanotube fibers based stretchable conductors and supercapacitors under cyclic deformation. The damage mode and damage evolution as a function of fatigue deformation are identified. After 10,000 stretching-releasing cycles with mechanical deformation up to 40% strain, the conductivities of buckled dry spun and aerogel spun CNT fiber based stretchable conductors exhibit excellent stability and the resistances increase by only about 0.2% and 6%, respectively. The areal specific capacitances of buckled dry spun and aerogel spun CNT fiber based stretchable supercapacitors change, respectively, from 4.42mFcm<SUP>-2</SUP> to 3.60mFcm<SUP>-2</SUP>, and from 8.16mFcm<SUP>-2</SUP> to 9.95mFcm<SUP>-2</SUP> at the scan rate of 50mVs<SUP>-1</SUP> after 10,000 deformation cycles.
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Iceberg Clique queries in large graphs
Hao, F.,Pei, Z.,Park, D.S.,Yang, L.T.,Jeong, Y.S.,Park, J.H. Elsevier Science Publishers 2017 Neurocomputing Vol.256 No.-
<P>This paper investigates the Iceberg Clique (IC) queries in a large graph, specially, given a user-specified threshold theta, an IC query reports the cliques where the number of vertices exceeds left perpendicular theta|V| right perpendicular. Toward this end, a practical IC query theorem is formally proposed and proved. With this proposed query theorem, a formal context and its corresponding iceberg concept lattice are first constructed from an input graph topology by Modified Adjacency Matrix; then, we prove that the IC queries problem is equivalent to finding the iceberg equiconcepts whose number of elements exceeds left perpendicular theta|V| right perpendicular. Theoretical analysis and experimental results demonstrate that the proposed query algorithm is feasible and efficient for finding the iceberg cliques from large graphs. (C) 2017 Published by Elsevier B.V.</P>
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