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Kim, SangYun,Cho, SungHun,Pu, YoungGun,Yoo, Sang-Sun,Lee, Minjae,Hwang, Keum Cheol,Yang, Youngoo,Lee, Kang-Yoon IEEE 2018 IEEE transactions on industrial electronics Vol.65 No.6
<P>In this paper, a pen detection analog system for an electromagnetic resonance (EMR) touch panel is presented. An adaptive charge pump is proposed in the transmitter to drive a high current to the EMR panel and achieve a high signal-to-noise ratio (SNR) in the receiver. To compensate for the mismatches between the channels due to fabrication variations of the EMR panels and process variations of the analog front-ends (AFEs), a transmitter driver with an adaptive controller is proposed, and an AFE calibration is implemented in the transmitter and the receiver, respectively. Also, a 9-bit, 2-MS/s time-interleaved flash successive-approximation-register (SAR) analog-to-digital converter (ADC) with 3-bit flash and 6-bit SAR ADCs is proposed to increase the frame rate with small area and power consumption. External noises, such as display and charger noises, can be rejected by the differential processing, analog low-pass filter, and digital filters in the digital signal processor (DSP). This read-out integrated circuit is implemented in a 0.18-μm Bipolar-CMOS-DMOS (BCD), and the die area is <TEX>${\text{40 mm}}^{\text{2}}$</TEX> including DSP and ADCs. The power consumptions are 110 and 45 mW in the transmitter and receiver modes, respectively. The SNR is about 39.5 dB and the frame rate is about 300 Hz in the 56 × 70 touch panel.</P>
Pleiotropic properties of GOLDEN2-LIKE transcription factors for crop improvement
Kim Sangyun,Choi Heebak,Yi Taegyu,Gwak Dohoon,Ha Sun-Hwa 한국응용생명화학회 2023 Applied Biological Chemistry (Appl Biol Chem) Vol.66 No.-
Crop improvement can be affected by enhancing the efficiency of photosynthesis-associated bioprocesses such as chlorophyll biosynthesis, chloroplast biogenesis, the functioning of photosystems including light-harvesting complexes, and carbon fixation. To achieve this, the GOLDEN2-LIKE (GLK) transcription factors represent promising targets since they play a positive role for greening traits in diverse plants. To scrutinize the pleiotropic impact of GLKs, we summarized all phenotypic traits reported in functional studies that used transgenic approaches to lose or gain gene functions. Additionally, we also discussed altered plant phenotypes with respect to their physiological–biochemical aspects and environmental stress responses. From these results, we conclude that GLKs consistently increase chlorophyll biosynthesis, enhance chloroplast division, and increase photosynthetic rate. They individually influence other traits including yield, phytochemical accumulation, and biotic and abiotic stress resistance. Collectively, GLKs have potential as key regulators to effect increases in overall agricultural quality across plant species. This suggests that they may be among the most promising target genes for future agro-biotechnology applications.
Sangyun Kim,Heui Jae Pahk 한국광학회 2018 Current Optics and Photonics Vol.2 No.2
In semiconductor manufacturing, critical dimensions indicate the features of patterns formed by the semiconductor process. The purpose of measuring critical dimensions is to confirm whether patterns are made as intended. The deposition process for an organic light emitting diode (OLED) forms a luminous organic layer on the thin-film transistor electrode. The position of this organic layer greatly affects the luminescent performance of an OLED. Thus, a system for measuring the position of the organic layer from outside of the vacuum chamber in real-time is desired for monitoring the deposition process. Typically, imaging from large stand-off distances results in low spatial resolution because of diffraction blur, and it is difficult to attain an adequate industrial-level measurement. The proposed method offers a new superresolution single-image using a conversion formula between two different optical systems obtained by a deep learning technique. This formula converts an image measured at long distance and with low-resolution optics into one image as if it were measured with high-resolution optics. The performance of this method is evaluated with various samples in terms of spatial resolution and measurement performance.
Kim, Doyeon,Oh, Nuri,Kim, Kyoohyun,Lee, SangYun,Pack, Chan-Gi,Park, Ji-Ho,Park, YongKeun Elsevier 2018 Methods Vol.136 No.-
<P><B>Abstract</B></P> <P>Delivery of gold nanoparticles (GNPs) into live cells has high potentials, ranging from molecular-specific imaging, photodiagnostics, to photothermal therapy. However, studying the long-term dynamics of cells with GNPs using conventional fluorescence techniques suffers from phototoxicity and photobleaching. Here, we present a method for 3-D imaging of GNPs inside live cells exploiting refractive index (RI) as imaging contrast. Employing optical diffraction tomography, 3-D RI tomograms of live cells with GNPs are precisely measured for an extended period with sub-micrometer resolution. The locations and contents of GNPs in live cells are precisely addressed and quantified due to their distinctly high RI values, which was validated by confocal fluorescence imaging of fluorescent dye conjugated GNPs. In addition, we perform quantitative imaging analysis including the segmentations of GNPs in the cytosol, the volume distributions of aggregated GNPs, and the temporal evolution of GNPs contents in HeLa and 4T1 cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Label-free imaging of gold nanoparticles inside live cells without using fluorescent probes. </LI> <LI> Time-lapsed 3D refractive index imaging with the tomogram over a long period. </LI> <LI> Cross-validation of 3D refractive index tomography of gold nanoparticles inside cells with confocal fluorescent images. </LI> <LI> Quantitative analysis of the volumes and 3D distributions of gold nanoparticles. </LI> </UL> </P>
An Inductive 2-D Position Detection IC With 99.8% Accuracy for Automotive EMR Gear Control System
Kim, SangYun,Abbasizadeh, Hamed,Ali, Imran,Kim, Hongjin,Cho, SungHun,Pu, YoungGun,Yoo, Sang-Sun,Lee, Minjae,Hwang, Keum Cheol,Yang, Youngoo,Lee, Kang-Yoon IEEE 2017 IEEE transactions on very large scale integration Vol.25 No.5
<P>In this paper, the analog front end (AFE) for an inductive position sensor in an automotive electromagnetic resonance gear control applications is presented. To improve the position detection accuracy, a coil driver with an automatic two-step impedance calibration is proposed which, despite the load variation, provides the desired driving capability by controlling the main driver size. Also, a time shared analog-todigital converter (ADC) is proposed to convert eight-phase signals while reducing the current consumption and area to 1/8 of the conventional structure. A relaxation oscillator with temperature compensation is proposed to generate a constant clock frequency in vehicle temperature conditions. This chip is fabricated using a 0.18-mu m CMOS process and the die area is 2 mm x 1.5 mm. The power consumption of the AFE is 23.1 mW from the supply voltage of 3.3 V to drive one transmitter (Tx) coil and eight receiver (Rx) coils. The measured position detection accuracy is greater than 99.8 %. The measurement of the Tx shows a driving capability higher than 35 mA with respect to the load change.</P>