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Site-Specific Growth of Width-Tailored Graphene Nanoribbons on Insulating Substrates
Song, Wooseok,Kim, Soo Youn,Kim, Yooseok,Kim, Sung Hwan,Lee, Su Il,Song, Inkyung,Jeon, Cheolho,Park, Chong-Yun American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.37
<P>The band-gap opening in graphene is a key factor in developing graphene-based field-effect transistors. Although graphene is a gapless semimetal, a band gap opens when graphene is formed into a graphene nanoribbon (GNR). Moreover, the band-gap energy can be manipulated by the width of the GNR. In this study, we propose a site-specific synthesis of a width-tailored GNR directly onto an insulating substrate. Predeposition of a diamond-like carbon nanotemplate onto a SiO<SUB>2</SUB>/Si wafer via focused ion-beam-assisted chemical vapor deposition is first utilized for growth of the GNR. These results may present a feasible route for growing a width-tailored GNR onto a specific region of an insulating substrate.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-37/jp303409c/production/images/medium/jp-2012-03409c_0008.gif'></P>
Song, Inkyung,Oh, Dong-Hwa,Shin, Ha-Chul,Ahn, Sung-Joon,Moon, Youngkwon,Woo, Sun-Hee,Choi, Hyoung Joon,Park, Chong-Yun,Ahn, Joung Real American Chemical Society 2015 NANO LETTERS Vol.15 No.1
<P>Cutting-edge research in the band engineering of nanowires at the ultimate fine scale is related to the minimum scale of nanowire-based devices. The fundamental issue at the subnanometer scale is whether angle-resolved photoemission spectroscopy (ARPES) can be used to directly measure the momentum-resolved electronic structure of a single wire because of the difficulty associated with assembling single wire into an ordered array for such measurements. Here, we demonstrated that the one-dimensional (1D) confinement of electrons, which are transferred from external dopants, within a single subnanometer-scale wire (subnanowire) could be directly measured using ARPES. Convincing evidence of 1D electron confinement was obtained using two different gold subnanowires with characteristic single metallic bands that were alternately and spontaneously ordered on a stepped silicon template, Si(553). Noble metal atoms were adsorbed at room temperature onto the gold subnanowires while the overall structure of the wires was maintained. Only one type of gold subnanowire could be controlled using external noble metal dopants without transforming the metallic band of the other type of gold subnanowires. This result was confirmed by scanning tunnelling microscopy experiments and first-principles calculations. The selective control clearly showed that externally doped electrons could be confined within a single gold subnanowire. This experimental evidence was used to further investigate the effects of the disorder induced by external dopants on a single subnanowire using ARPES.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-1/nl503558g/production/images/medium/nl-2014-03558g_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl503558g'>ACS Electronic Supporting Info</A></P>
김인경 ( Inkyung Kim ),김대희 ( Daehee Kim ),노송 ( Song Noh ),이재구 ( Jaekoo Lee ) 한국정보처리학회 2021 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.10 No.3
In this paper, fall detection using individual wearable devices for older people is considered. To design a low-cost wearable device for reliable fall detection, we present a comprehensive analysis of two representative models. One is a machine learning model composed of a decision tree, random forest, and Support Vector Machine(SVM). The other is a deep learning model relying on a one-dimensional(1D) Convolutional Neural Network(CNN). By considering data segmentation, preprocessing, and feature extraction methods applied to the input data, we also evaluate the considered models’ validity. Simulation results verify the efficacy of the deep learning model showing improved overall performance.
Ryu, Hanyoung,Song, Inkyung,Kim, Beomyoung,Cho, Soohyun,Soltani, Shoresh,Kim, Timur,Hoesch, Moritz,Kim, Choong H.,Kim, Changyoung American Physical Society 2017 Physical Review B Vol.95 No.11
<P>We performed angle-resolved photoemission experiments on Au(111) surface with circularly polarized light. Data were taken with photon energies in the range between 20 and 100 eV in order to investigate the photon energy dependent behavior in the circular dichroism (CD). While the magnitude of the normalized CD value varies with a maximum value of about 70%, the sign of CD does not change for the photon energy within the range, inconsistent with the prediction based on the density-functional theory (DFT) calculation. Our calculation of the CD using DFT initial state and free electron final state shows a better consistency with experimental results than an earlier study using the inverse low-energy electron diffraction state as the final state. We briefly discuss the dominating factor that determines the CD from Au(111) states.</P>
다항 로짓 회귀모형에서의 그룹화 전략을 이용한 적합도 검정 방법 비교
송미경,정인경,Song, Mi Kyung,Jung, Inkyung 한국통계학회 2013 응용통계연구 Vol.26 No.6
Several goodness-of-fit test statistics have been proposed for a multinomial logit regression model; however, the properties of the proposed tests were not adequately studied. This paper evaluates three different goodness-of-fit tests using grouping strategies, proposed by Fagerland et al. (2008), Bull (1994), and Pigeon and Heyse (1999). In addition, Pearson (1900)'s method is also examined as a reference. Simulation studies were conducted to evaluate the four methods in terms of null distribution and power. A real data example is presented to illustrate the methods. 지금까지 제안되어 있는 다항 로짓 회귀모형의 적합도 검정 방법들에 대하여 저자들이 제안한 방법들이 타당한지를 확인하고자 본 연구를 진행하였다. 여러 검정 통계량들 중 그룹화 전략을 이용한 통계량들 (Fagerland 등, 2008; Bull, 1994; Pigeon과 Heyse, 1999)을 선정하였고, 이러한 통계량의 기반이 되는 피어슨 ${\chi}^2$ 통계량 또한 같이 비교하였다. 제안된 분포가 모의실험의 상황 하에 얻어지는 귀무분포와 유사한지, 그리고 부적절한 모형의 판별을 적절히 수행하는지에 대하여 확인하였으며, 실제 자료에 세 가지 방법을 적용한 결과를 비교, 평가하였다.
Millimeter-Scale Growth of Single-Oriented Graphene on a Palladium Silicide Amorphous Film
Kim, Hyun-Woo,Song, Inkyung,Kim, Tae-Hoon,Ahn, Sung Joon,Shin, Ha-Chul,An, Byeong-Seon,Jang, Yamujin,Jeon, Sunam,Kim, Eun Hye,Khadka, Ishwor Bahadur,Gu, TaeJun,Woo, Sun-Hee,Whang, Dongmok,Kim, Youngku American Chemical Society 2019 ACS NANO Vol.13 No.2
<P>It is widely accepted in condensed matter physics and material science communities that a single-oriented overlayer cannot be grown on an amorphous substrate because the disordered substrate randomizes the orientation of the seeds, leading to polycrystalline grains. In the case of two-dimensional materials such as graphene, the large-scale growth of single-oriented materials on an amorphous substrate has remained unsolved. Here, we demonstrate experimentally that the presence of uniformly oriented graphene seeds facilitates the growth of millimeter-scale single-oriented graphene with 3 × 4 mm<SUP>2</SUP> on palladium silicide, which is an amorphous thin film, where the uniformly oriented graphene seeds were epitaxially grown. The amorphous palladium silicide film promotes the growth of the single-oriented growth of graphene by causing carbon atoms to be diffusive and mobile within and on the substrate. In contrast to these results, without the uniformly oriented seeds, the amorphous substrate leads to the growth of polycrystalline graphene grains. This millimeter-scale single-oriented growth from uniformly oriented seeds can be applied to other amorphous substrates.</P> [FIG OMISSION]</BR>