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Novel Method for Combining Flexible Organic Light-Emitting Diodes with Organic Thin-Film Transistors
Taehyoung Zyung,Hye Yong Chu,Jeong-Ik Lee,Ji Young Oh,Jung Hun Lee,Sang Chul Lim,Seong Hyun Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.I
We present a new method of driving an organic light-emitting diode (OLED) with an organic thin-film transistor (OTFT). The OTFT and the OLED were fabricated on separate plastic substrates and both devices were laminated with silver paste. After driving a 2 × 2 mm2 OLED with an OTFT device, we obtained 180 cd/m2 at a current density of 5 mA/cm2 from the green OLED by using an OTFT with mobility, on-off ratio, threshold voltage, and subthreshold slope of 0.21 cm2/V·s, 103, 32 V, and 20 V/decade, respectively.
Traffic convexity aware cellular networks: a vehicular heavy user perspective
Taehyoung Shim,Jihong Park,Seung-Woo Ko,Seong-Lyun Kim,Beomhee Lee,Jingu Choi IEEE 2016 IEEE wireless communications Vol.23 No.1
<P>Rampant mobile traffic increase in modern cellular networks is largely due to large-sized multimedia contents. Recent advancements in smart devices as well as radio access technologies promote the consumption of bulky content, even for passengers in moving vehicles, referred to as vehicular heavy users. In this article the emergence of vehicular heavy user traffic is observed by field experiments conducted in 2012 and 2015 in Seoul, Korea. The experiments reveal that such traffic is becoming dominant, as shown by the 8.62 times increase in vehicular heavy user traffic while total traffic increased just 3.04 times. To resolve this so-called VHP, we propose a cell association algorithm that exploits user demand diversity for different velocities. This user traffic pattern is discovered first by our field trials, which is convex-shaped over velocity, that is, walking user traffic is less than stationary or vehicular user traffic. As VHP becomes severe, our numerical evaluation verifies that the proposed cell association outperforms in practice a well-known load balancing association, cell range expansion. In addition to cell association, several complementary techniques are suggested in line with the technical trend toward 5G.</P>
Taehyoung Kim,Sung-Ho Jin,Jongwook Park,Kwon Taek Lim,Sang Youl Kim,Yeong-Soon Gal 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
A new ionic polyacetylene having perfluorinated benzyl substituent, poly(2-ethynyl-N-heptafluor-obenzylpyridinium iodide), was synthesized via the direct polymerization of the quaterinazed acetylenicpyridinium monomers. The polymerization proceeded homogeneously without any additional initiatoror catalyst to give a moderate yield of polymer. The results of instrumental analyses on the molecularstructure of polymer revealed that the polymer have polyacetylene backbone system with Nheptafluorobenzylicpyridiniumiodide as substituent. The photoluminescence (PL) spectra of polymerexhibited that the PL peak is located at 550 nm, corresponding to a photon energy of 2.26 eV. Theirreversible electrochemical behaviors of polymer between the doped and undoped peaks were observedin the cyclic voltammograms of polymer. The initial oxidation and reduction of poly(EHFBPI) occurred at0.53 V and -0.75 V (vs Ag/AgNO3). HOMO level of poly(EHFBPI) was 5.27 eV.
Cortical representation of musical pitch in event-related potentials
Taehyoung Kim,Miyoung Chung,Eunju Jeong,Yang Seok Cho,Oh-Sang Kwon,Sung-Phil Kim 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.3
Neural coding of auditory stimulus frequency is well-documented; however, the cortical signals and perceptual correlates of pitch have not yet been comprehensively investigated. This study examined the temporal patterns of event-related potentials (ERP) in response to single tones of pitch chroma, with an assumption that these patterns would be more prominent in musically-trained individuals than in non-musically-trained individuals. Participants with and without musical training (N = 20) were presented with seven notes on the C major scale (C4, D4, E4, F4, G4, A4, and B4), and whole-brain activities were recorded. A linear regression analysis between the ERP amplitude and the seven notes showed that the ERP amplitude increased or decreased as the frequency of the pitch increased. Remarkably, these linear correlations were anti-symmetric between the hemispheres. Specifically, we found that ERP amplitudes of the left and right frontotemporal areas decreased and increased, respectively, as the pitch frequency increased. Although linear slopes were significant in both groups, the musically-trained group exhibited marginally steeper slope, and their ERP amplitudes were most discriminant for frequency of tone of pitch at earlier latency than in the non-musically-trained group (~ 460 ms vs ~ 630 ms after stimulus onset). Thus, the ERP amplitudes in frontotemporal areas varied according to the pitch frequency, with the musically-trained participants demonstrating a wider range of amplitudes and inter-hemispheric anti-symmetric patterns. Our findings may provide new insights on cortical processing of musical pitch, revealing anti-symmetric processing of musical pitch between hemispheres, which appears to be more pronounced in musically-trained people.