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Glide Formation and Compensatory Lengthening in Korean Verbal Conjugation
Yongsung Lee 한국음운론학회 1997 음성·음운·형태론 연구 Vol.3 No.-
Lee, Yongsung. 1997. Glide Formation and Compensatory Lengthening in Korean Verbal Congjugation. Studies in Phonetics, Phonology and Morphology 3, 223-246. This paper dea1s with glide formation in connection with compensatory lengthening in Korean verbal conjugation. Glide formation in Korean is obligatory in certain environments while optional in other environments. Sometimes the glide formation is accompanied by compensatory lengthening while in other times it is not. The complicated phenomena involved in glide formation, however, can be systematically explained with an Optimality Theoretic approach. This paper makes use of two crucial constraints Onset and NoComplex and their interaction with syllable wellformedness constraints such as Parse-? and Fill. With the assumption that the two constraints Onset and NoComplex are unordered in their ranks, the obligatory and the optional nature of glide formation are neatly captured. Further it is seen that the compensatory lengthening found in initial syllables comes from the interaction of syllable wellformedness constraints and alignment requirement of a heavy or long syllable. (Pusan University of Foreign Studies)
Tension assisted metal transfer of graphene for Schottky diodes onto wafer scale substrates
Lee, Jooho,Lee, Su Chan,Kim, Yongsung,Heo, Jinseong,Lee, Kiyoung,Lee, Dongwook,Kim, Jaekwan,Lee, Sunghee,Lee, Chang Seung,Nam, Min Sik,Jun, Seong Chan IOP 2016 Nanotechnology Vol.27 No.7
<P>We developed an effective graphene transfer method for graphene/silicon Schottky diodes on a wafer as large as 6 inches. Graphene grown on a large scale substrate was passivated and sealed with a gold layer, protecting graphene from any possible contaminant and keeping good electrical contact. The Au/graphene was transferred by the tension-assisted transfer process without polymer residues. The gold film itself was used directly as the electrodes of a Schottky diode. We demonstrated wafer-scale integration of graphene/silicon Schottky diode using the proposed transfer process. The transmission electron microscopy analysis and relatively low ideality factor of the diodes indicated fewer defects on the interface than those obtained using the conventional poly(methyl methacrylate)-assisted transfer method. We further demonstrated gas sensors as an application of graphene Schottky diodes.</P>
Crack-Release Transfer Method of Wafer-Scale Grown Graphene Onto Large-Area Substrates
Lee, Jooho,Kim, Yongsung,Shin, Hyeon-Jin,Lee, ChangSeung,Lee, Dongwook,Lee, Sunghee,Moon, Chang-Yul,Lee, Su Chan,Kim, Sun Jun,Ji, Jae Hoon,Yoon, Hyong Seo,Jun, Seong Chan American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>We developed a crack-release graphene transfer technique for opening up possibilities for the fabrication of graphene-based devices. Graphene film grown on metal catalysts/SiO<SUB>2</SUB>/Si wafer should be scathelessly peeled for sequent transferring to a target substrate. However, when the graphene is grown on the metal catalyst on a silicon substrate, there is a large tensile stress resulting from the difference of the coefficient of thermal expansion in the catalyst and silicon. The conventional methods of detaching graphene from metal catalysts were found to induce considerable mechanical damage on graphene films during separation processes including metal wet etching. Here we report a new technique wherein bubbles generated by electrolysis reaction separate thin metal catalysts from the SiO<SUB>2</SUB>/Si wafer. The dry attachment of graphene to the target wafer was processed utilizing a wafer to wafer bonding technique in a vacuum. We measured the microscopic image, Raman spectra, and electrical properties of the transferred graphene. The optical and electrical properties of the graphene transferred by the bubbles/dry method are better than those of the graphene obtained by mechanical/wet transfer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am502565z/production/images/medium/am-2014-02565z_0005.gif'></P>
Ji, Yongsung,Kim, Juhan,Cha, An-Na,Lee, Sang-A,Lee, Myung Woo,Suh, Jung Sang,Bae, Sukang,Moon, Byung Joon,Lee, Sang Hyun,Lee, Dong Su,Wang, Gunuk,Kim, Tae-Wook IOP 2016 Nanotechnology Vol.27 No.14
<P>A highly efficient solution-processible charge trapping medium is a prerequisite to developing high-performance organic nano-floating gate memory (NFGM) devices. Although several candidates for the charge trapping layer have been proposed for organic memory, a method for significantly increasing the density of stored charges in nanoscale layers remains a considerable challenge. Here, solution-processible graphene quantum dots (GQDs) were prepared by a modified thermal plasma jet method; the GQDs were mostly composed of carbon without any serious oxidation, which was confirmed by x-ray photoelectron spectroscopy. These GQDs have multiple energy levels because of their size distribution, and they can be effectively utilized as charge trapping media for organic NFGM applications. The NFGM device exhibited excellent reversible switching characteristics, with an on/off current ratio greater than 10<SUP>6</SUP>, a stable retention time of 10<SUP>4</SUP> s and reliable cycling endurance over 100 cycles. In particular, we estimated that the GQDs layer trapped ∼7.2?×?10<SUP>12</SUP> cm<SUP>−2</SUP> charges per unit area, which is a much higher density than those of other solution-processible nanomaterials, suggesting that the GQDs layer holds promise as a highly efficient nanoscale charge trapping material.</P>
Constraint combinations and phonological opacity
Yongsung Lee 한국음운론학회 2014 음성·음운·형태론 연구 Vol.20 No.2
This paper presents an extensive explanation to opacity, which represents one of the most recalcitrant problems in Optimality theory. The research history of opacity in Optimality theory is that of gradual departure from its original proposal. The recent proposal of OT-CC by McCarthy virtually gives up the idea of parallelism and argues for the importance of derivational history. This paper, however, reviews the opacity problems and offers an alternative explanation without abandoning parallelism. This paper makes use of constraint combinations to explain both underapplication opacity and overapplication opacity. It cites various papers to show that the underapplication opacity is the work of disjunctively combined complex constraint. Based on such constraint combinations, it further argues that the overapplication opacity is also the work of a combined constraint. The complex constraint with implicational combination and its interaction with relevant constraints can explain the overapplication opacity. As such, this paper shows that we can deal with opacity issues in Optimality without introducing derivational history or constraints that do not fall into either markedness or faithfulness constraint family.
Flexible marginalized models for bivariate longitudinal ordinal data
Lee, Keunbaik,Daniels, Michael J.,Joo, Yongsung Oxford University Press 2013 Biostatistics Vol.14 No.3
<P>Random effects models are commonly used to analyze longitudinal categorical data. Marginalized random effects models are a class of models that permit direct estimation of marginal mean parameters and characterize serial correlation for longitudinal categorical data via random effects (Heagerty, 1999). Marginally specified logistic-normal models for longitudinal binary data. <I>Biometrics</I> <B>55</B>, 688–698; Lee and Daniels, 2008. Marginalized models for longitudinal ordinal data with application to quality of life studies. <I>Statistics in Medicine</I> <B>27</B>, 4359–4380). In this paper, we propose a Kronecker product (KP) covariance structure to capture the correlation between processes at a given time <I>and</I> the correlation within a process over time (serial correlation) for bivariate longitudinal ordinal data. For the latter, we consider a more general class of models than standard (first-order) autoregressive correlation models, by re-parameterizing the correlation matrix using partial autocorrelations (Daniels and Pourahmadi, 2009). Modeling covariance matrices via partial autocorrelations. <I>Journal of Multivariate Analysis</I> <B>100</B>, 2352–2363). We assess the reasonableness of the KP structure with a score test. A maximum marginal likelihood estimation method is proposed utilizing a quasi-Newton algorithm with quasi-Monte Carlo integration of the random effects. We examine the effects of demographic factors on metabolic syndrome and C-reactive protein using the proposed models.</P>