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김건오(Kono Kim),고영중(Youngjoong Ko),서정연(Jungyun Seo) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1B
자동 문서 요약 시스템은 문서내 담겨있는 정보를 최대한 표현하면서 문서의 크기를 줄이는 시스템이다. 본 논문에서는 어휘를 자동으로 클러스터링하여 문서 대표어를 찾고, 이를 제목과 조합하여 요약을 수행하는 시스템을 제안한다. 특히 이 시스템은 제목이 없는 문서도 요약을 수행할 수 있는 장점이 있다. 비교시스템으로는 제목, 위치, 빈도를 이용한 시스템을 구축하여 사용하였으며 30%, l0%, 그리고 4문장 요약에서 제안한 시스템은 모두 우수한 성능을 보였다.
Polarization anisotropy of transient carrier and phonon dynamics in carbon nanotubes
Kim, Ji-Hee,Park, Jaegyu,Lee, Bong Yeon,Lee, Donghan,Yee, Ki-Ju,Lim, Yong-Sik,Booshehri, Layla G.,Há,roz, Erik H.,Kono, Junichiro,Baik, Sung-Hoon American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.10
Coherent phonons in carbon nanotubes and graphene
Kim, J.H.,Nugraha, A.R.T.,Booshehri, L.G.,Haroz, E.H.,Sato, K.,Sanders, G.D.,Yee, K.J.,Lim, Y.S.,Stanton, C.J.,Saito, R.,Kono, J. Elsevier Science Publishers [etc.] 2013 Chemical physics Vol.413 No.-
We review recent studies of coherent phonons (CPs) corresponding to the radial breathing mode (RBM) and G-mode in single-wall carbon nanotubes (SWCNTs) and graphene. Because of the bandgap-diameter relationship, RBM-CPs cause bandgap oscillations in SWCNTs, modulating interband transitions at terahertz frequencies. Interband resonances enhance CP signals, allowing for chirality determination. Using pulse shaping, one can selectively excite specific-chirality SWCNTs within an ensemble. G-mode CPs exhibit temperature-dependent dephasing via interaction with RBM phonons. Our microscopic theory derives a driven oscillator equation with a density-dependent driving term, which correctly predicts CP trends within and between (2n+m) families. We also find that the diameter can initially increase or decrease. Finally, we theoretically study the radial breathing like mode in graphene nanoribbons. For excitation near the absorption edge, the driving term is much larger for zigzag nanoribbons. We also explain how the armchair nanoribbon width changes in response to laser excitation.
( Tae Kyoung Kim ),( Seung Yeon Noh ),( Stephanie R Wilson ),( Yuko Kono ),( Fabio Piscaglia ),( Hyun-jung Jang ),( Andrej Lyshchik ),( Christoph F. Dietrich ),( Juergen K. Willmann ),( Alexander Veze 대한간학회 2017 Clinical and Molecular Hepatology(대한간학회지) Vol.23 No.4
Medical imaging plays an important role in the diagnosis and management of hepatocellular carcinoma (HCC). The Liver Imaging Reporting and Data System (LI-RADS) was initially created to standardize the reporting and data collection of CT and MR imaging for patients at risk for HCC. As contrast-enhanced ultrasound (CEUS) has been widely used in clinical practice, it has recently been added to the LI-RADS. While CEUS LI-RADS shares fundamental concepts with CT/MRI LI-RADS, there are key differences between the modalities reflecting dissimilarities in the underlying methods of image acquisition and types of contrast material. This review introduces a recent update of CEUS LI-RADS and explains the key differences from CT/MRI LI-RADS. (Clin Mol Hepatol 2017;23:280-289)
Evidence of Supersolidity in Rotating Solid Helium
Choi, H.,Takahashi, D.,Kono, K.,Kim, E. American Association for the Advancement of Scienc 2010 Science Vol.330 No.6010
<P>Supersolidity, the appearance of zero-viscosity flow in solids, was first indicated in helium-4 torsional oscillator (TO) experiments. In this apparatus, the irrotationality of the superfluid component causes it to decouple from the underlying normal solid, leading to a reduction in the resonant period of the TO. However, the resonant period may be altered for reasons other than supersolidity, such as the temperature dependence of the elastic modulus of solid helium. Superimposing rotation onto oscillatory measurements may distinguish between supersolidity and classical effects. We performed such simultaneous measurements of the TO and the shear modulus, and observed substantial change in the resonant period with rotational speed where the modulus remained unchanged. This contrasting behavior suggests that the decrease in the TO period is a result of supersolidity.</P>