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Analysis of Electrothermal Characteristics of GAA Vertical Nanoplate-Shaped FETs
Son, Dokyun,Myeong, Ilho,Kim, Hyunsuk,Kang, Myounggon,Jeon, Jongwook,Shin, Hyungcheol Institute of Electrical and Electronics Engineers 2018 IEEE transactions on electron devices Vol.65 No.7
<P>In this paper, the thermal and electrical characteristics of a gate-all-around (GAA) vertical nanoplate-shaped field-effect transistor ( <TEX>${v}$</TEX>NPFET) are studied for sub-5-nm technologies using well-calibrated technology computer-aided design simulations. An asymmetric structure of a vertical device has different characteristics that depend on the source/drain position. When the source and the drain are placed at the top and the bottom electrodes, respectively, the GAA- <TEX>${v}$</TEX>NPFET drive current increases, but the self-heating effect becomes worse. To co-optimize the performance and the reliability, the gate delay ( <TEX>$\tau _{\textsf {delay}}$</TEX>) and the thermal resistance ( <TEX>${R}_{\textsf {th}}$</TEX>) were evaluated simultaneously in terms of various geometric factors for the first time, showing that a reckless scaling of the channel thickness below 5 nm significantly degrades the electrothermal characteristics.</P>
원현석(Hyunsuk Won),손병준(Byungjun Son),이일병(Yillbyung Lee) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1B
홍채인식 시스템은 영상획득, 전처리, 특징 추출, 패턴 정합의 단계로 이루어져 있다. 이 중 특징 추출은 특징 차원의 감소뿐만 아니라 분류 정확도의 증가를 위한 필수적인 과정이다. 본 논문에서는 특징을 추출하는데 있어서, 홍채데이타에 웨이블렛 변환의 다해상도 분석 기법을 시도하여 일정 영역을 추출한 후, 그 영역에 유전자 알고리즘(Genetic Algorithm)을 적용하여 가장 분별력있는 특징들만을 추출 및 사용하는 홍채인식 시스템을 제안한다. 유전자 알고리즘의 선택연산자로는 적응도 비례 방식과 전역 엘리트 방식을 사용하였으며, 적합도 함수로는 Gaussian Kernel을 사용하는 Support Vector Machine(SVM)을 사용하였다. 본 시스템을 통해 나온 최적의 특징집합을 이용한 SVM분류기로 인식률을 알아본 결과 웨이블렛만을 사용했을 때 보다 대략 1.5%정도 더 좋은 인식률을 얻을 수 있었다.
Induced freezing tolerance and free amino acids perturbation of spinach by exogenous proline
Shin, Hyunsuk,Oh, Sewon,Kim, Daeil,Hong, Jeum Kyu,Yun, Jae Gil,Lee, Sang Woo,Son, Ki-Ho The Korean Society of Plant Biotechnology 2018 식물생명공학회지 Vol.45 No.4
The objective of this study was to investigate whether exogenous proline (Pro) could confer freezing tolerance of spinach and determine fluctuations of free amino acids in spinach leaf tissues under freeze-induced stress. Treatment with Pro (10 mM) resulted in more accumulation of Pro (~2.6-fold) in Pro-treated spinaches compared to untreated ones. These Pro-pretreated spinaches were more freezing-tolerant, showing more turgid leaves and petioles compared to untreated controls. However, when spinaches pre-treated with or without Pro were subjected to freezing, there was no significant difference in overall amino acid contents, emphasizing the role of Pro as an osmoprotectant. Freezing stress prompted intensification of total amino acid contents irrespective of pretreatment with Pro. Asp, Glu, Ala, and Val were the most abundant free amino acids due to increased protein degradation and nitrogen mobilization for plant survival under freezing stress. Arg, a precursor for the synthesis of polyamines in plants, was profoundly enhanced under freezing stress. This implies that Arg plays an important role in modulating freezing tolerance. Gly, Leu, and Ile were maintained at relatively low levels in all treatments. However, Ser, Tyr, and Lys as primary constituents of dehydrins were accumulated under freezing stress, suggesting that they might play a role in increasing cryoprotective activity under freezing stress.
Structure–Activity Relationships of 6- and 8-Gingerol Analogs as Anti-Biofilm Agents
Choi, Hyunsuk,Ham, So-Young,Cha, Eunji,Shin, Yujin,Kim, Han-Shin,Bang, Jeong Kyu,Son, Sang-Hyun,Park, Hee-Deung,Byun, Youngjoo American Chemical Society 2017 Journal of medicinal chemistry Vol.60 No.23
<P><I>Pseudomonas aeruginosa</I> is a causative agent of chronic infections in immunocompromised patients. Disruption of quorum sensing circuits is an attractive strategy for treating diseases associated with <I>P. aeruginosa</I> infection. In this study, we designed and synthesized a series of gingerol analogs targeting LasR, a master regulator of quorum sensing networks in <I>P. aeruginosa</I>. Structure–activity relationship studies showed that a hydrogen-bonding interaction in the head section, stereochemistry and rotational rigidity in the middle section, and optimal alkyl chain length in the tail section are important factors for the enhancement of LasR-binding affinity and for the inhibition of biofilm formation. The most potent compound <B>41</B>, an analog of (<I>R</I>)-8-gingerol with restricted rotation, showed stronger LasR-binding affinity and inhibition of biofilm formation than the known LasR antagonist (<I>S</I>)-6-gingerol. This new LasR antagonist can be used as an early lead compound for the development of anti-biofilm agents to treat <I>P. aeruginosa</I> infections.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jmcmar/2017/jmcmar.2017.60.issue-23/acs.jmedchem.7b01426/production/images/medium/jm-2017-01426j_0015.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jm7b01426'>ACS Electronic Supporting Info</A></P>
Analysis on Self-Heating Effects in Three-Stacked Nanoplate FET
Kim, Hyunsuk,Son, Dokyun,Myeong, Ilho,Kang, Myounggon,Jeon, Jongwook,Shin, Hyungcheol Institute of Electrical and Electronics Engineers 2018 IEEE transactions on electron devices Vol.65 No.10
<P>In this paper, self-heating effects (SHEs) in three-stacked nanoplate FETs were investigated through the TCAD simulation. In order to obtain high reliability, the evaluation of SHEs was performed after <TEX>${I}_{D}$</TEX>– <TEX>${V}_{G}$</TEX> curve fitting based on the experimental data. First, general analysis on SHEs was conducted to confirm the influence of SHEs to electrical characteristics. The optimized nanoplate width for great electrical properties was proposed by using the figure-of-merit factor under the consideration of SHEs. In addition, difference of heat flux between FinFET and stacked nanoplate FET was analyzed. Based on the analysis, the two-step thermal resistance ( <TEX>${R}_{\text {th}}$</TEX>) model depending on drain voltage was proposed. The two-step <TEX>${R}_{\text {th}}$</TEX> model in the stacked nanoplate FET matched well with the Berkeley short-channel IGFET model—common multigate model compared the other <TEX>${R}_{\text {th}}$</TEX> models. A seven-stage ring oscillator with the proposed <TEX>${R}_{\text {th}}$</TEX> model was demonstrated, and SHEs in the circuit level were confirmed.</P>