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權榮郁,金一,金康彦,柳志久 釜山工業大學校 1994 論文集 Vol.36 No.-
One of the ultimate purposes in speech recognition is to recognize all of the arbitrary natural-sentences spoken by arbitrary speakers under any noisy environment. This paper describes how HMM is applied to speech recognition and specific parameters are estimated, and vector quantization(VQ) is obtained. Also some experiments of speech recognition are performed for digit that are pronounced four times by twenty Korean adults. The results show that recognition accuracy are 99.7% and 96.0% in closed-test recognition and open-test recognition, respectively.
Kwon, Ji Eon,Hyun, Chang-Seok,Ryu, Young Jun,Lee, Joungphil,Min, Dong Joo,Park, Moon Jeong,An, Byeong-Kwan,Park, Soo Young The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.7
<P>Organic redox-active molecules have attracted great attention for next generation electrode materials due to their promising advantages of low cost, natural abundance, environmental friendliness, and structural diversity. Here we propose a new molecular design strategy to achieve both large specific capacity and high energy organic cathode materials for Li-ion batteries using a triptycene scaffold as a minimal linker between the redox-active units. The triptycene molecule bearing three benzoquinone (BQ) units in a rigid tripod structure exhibits five-electron redox reactions that practically provide a specific capacity as high as 387 mA h g<SUP>−1</SUP> in Li-ion coin cells. By combining electrochemical analyses with theoretical DFT calculations, we figure out that the 3-D arrangements of BQ units in triptycene not only facilitate a highly reversible access to a large number of redox states but also raise the redox potential. Due to the large capacity and the increased redox potential, the triptycene electrode can deliver a specific energy up to 1032 W h kg<SUP>−1</SUP> at 0.1C-rate, which is close to two times the specific energy of the conventional inorganic cathode materials. It is also demonstrated that the cycling performance of triptycenes can be greatly improved by fabricating nanocomposite materials with the ordered mesoporous carbon CMK3.</P>
Kwon, Ji Eon,Lee, Sumin,You, Youngmin,Baek, Kyung-Hwa,Ohkubo, Kei,Cho, Jaeheung,Fukuzumi, Shunichi,Shin, Injae,Park, Soo Young,Nam, Wonwoo American Chemical Society 2012 Inorganic Chemistry Vol.51 No.16
<P>A new fluorescent zinc sensor (HNBO–DPA) consisting of 2-(2′-hydroxy-3′-naphthyl)benzoxazole (HNBO) chromophore and a di(2-picolyl)amine (DPA) metal chelator has been prepared and examined for zinc bioimaging. The probe exhibits zinc-induced fluorescence turn-on without any spectral shifts. Its crystal structure reveals that HNBO–DPA binds a zinc ion in a pentacoordinative fashion through the DPA and HNBO moieties. Steady-state photophysical studies establish zinc-induced deprotonation of the HNBO group. Nanosecond and femtosecond laser flash photolysis and electrochemical measurements provide evidence for zinc-induced modulation of photoinduced electron transfer (PeT) from DPA to HNBO. Thus, the zinc-responsive fluorescence turn-on is attributed to suppression of PeT exerted by deprotonation of HNBO and occupation of the electron pair of DPA, a conclusion that is further supported by density functional theory and time-dependent density functional theory (DFT/TD-DFT) calculations. Under physiological conditions (pH 7.0), the probe displays a 44-fold fluorescence turn-on in response to zinc ions with a <I>K</I><SUB>d</SUB> value of 12 pM. The fluorescent response of the probe to zinc ions is conserved over a broad pH range with its excellent selectivity for zinc ions among biologically relevant metal ions. In particular, its sensing ability is not altered by divalent transition metal ions such as Fe(II), Cu(II), Cd(II), and Hg(II). Cell experiments using HNBO–DPA show its suitability for monitoring intracellular zinc ions. We have also demonstrated applicability of the probe to visualize intact zinc ions released from cells that undergo apoptosis. More interestingly, zinc-rich pools in zebrafish embryos are traced with HNBO–DPA during early developmental stages. The results obtained from the <I>in vitro</I> and <I>in vivo </I>imaging studies demonstrate the practical usefulness of the probe to detect zinc ions.</P><P>The fluorescence sensor, constructed based on an excited-state intramolecular proton transfer (ESIPT) platform, displays zinc-selective turn-on response with <I>K</I><SUB>d</SUB> = 12 pM at pH 7.0. The fluorescence zinc response is attributed to suppression of photoinduced electron transfer exerted by deprotonation and occupation of the electron pair of the metal chelator. The zinc probe is capable of detection of endogenous free zinc ions in apoptotic mammalian cells and zebrafish embryos.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2012/inocaj.2012.51.issue-16/ic300476e/production/images/medium/ic-2012-00476e_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic300476e'>ACS Electronic Supporting Info</A></P>
Kwon, Ji Eon,Park, Soo Young WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.32
<P><B>Abstract</B></P><P>Recently, organic fluorescent molecules harnessing the excited‐state intramolecular proton transfer (ESIPT) process are drawing great attention due to their unique photophysical properties which facilitate novel optoelectronic applications. After a brief introduction to the ESIPT process and related photophysical properties, molecular design strategies towards tailored emission are discussed in relation to their theoretical aspects. Subsequently, recent studies on advanced ESIPT molecules and their optoelectronic applications are surveyed, particularly focusing on chemical sensors, fluorescence imaging, proton transfer lasers, and organic light‐emitting diodes (OLEDs).</P>
Kwon, Ji Eon,Park, Sanghyuk,Park, Soo Young American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.30
<P>A full-color molecular pixel system is realized for the first time using simple mixtures composed of RGB-emitting excited-state intramolecular proton transfer (ESIPT) dyes, each of which has delicately tailored Stokes shift and independent emission capability completely free from energy transfer crosstalk between them. It is demonstrated that the whole range of emission colors enclosed within the RGB color triangle on the CIE 1931 diagram is predictable and conveniently reproducible from the RGB molecular pixels not only in the solution but also in the polymer film. It must be noted that mixing ratios to reproduce the desired color coordinates can be precisely calculated on the basis of additive color theory according to their molecular pixel behavior.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-30/ja404256s/production/images/medium/ja-2013-04256s_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja404256s'>ACS Electronic Supporting Info</A></P>