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김병석,박기훈,Lee Ok-Hee,Lee Giwan,Kim Hyoukjung,Lee Siyoung,황세미,김영봉,Choi Youngsok 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.1
Objective: This study aimed to examine the influence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection on pregnancy in cytokeratin-18 (K18)-hACE2 transgenic mice. Methods: To determine the expression of hACE2 mRNA in the female reproductive tract of K18-hACE2 mice, real-time polymerase chain reaction (RT-PCR) was performed using the ovary, oviduct, uterus, umbilical cord, and placenta. SARS-CoV-2 was inoculated intranasally (30 μL/mouse, 1×104 TCID50/mL) to plug-checked K18-hACE2 homozygous female mice at the pre-and post-implantation stages at 2.5 days post-coitum (dpc) and 15.5 dpc, respectively. The number of implantation sites was checked at 7.5 dpc, and the number of normally born pups was investigated at 20.5 dpc. Pregnancy outcomes, including implantation and childbirth, were confirmed by comparison with the non-infected group. Tissues of infected mice were collected at 7.5 dpc and 19.5 dpc to confirm the SARS-CoV-2 infection. The infection was identified by performing RT-PCR on the infected tissues and comparing them to the non-infected tissues. Results: hACE2 mRNA expression was confirmed in the female reproductive tract of the K18-hACE2 mice. Compared to the non-infected group, no significant difference in the number of implantation sites or normally born pups was found in the infected group. SARS-CoV-2 infection was detected in the lungs but not in the female reproductive system of infected K18-hACE2 mice. Conclusion: In K18-hACE2 mice, intranasal infection with SARS-CoV-2 did not induce implantation failure, preterm labor, or miscarriage. Although the viral infection was not detected in the uterus, placenta, or fetus, the infection of the lungs could induce problems in the reproductive system. However, lung infections were not related to pregnancy outcomes.
Jeongki Choi,In-Young Lee,Kanghyuk Lee,Seok-Oh Yun,Joomyoung Kim,Jinho Ko,Giwan Yoon,Sang-Gug Lee Professional Technical Group on Microwace Theory a 2014 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>This paper presents a fully integrated 5.8-GHz dedicated short-range communication transceiver with a 10- μA interference-aware wake-up receiver (WuRx) for Chinese electronic toll collection system terminals that can operate with a low standby and operating current consumption. To reduce the current consumption, a high-gain RF envelope detector using a voltage-boosting method is proposed for both the WuRx and receiver (Rx) while the proposed high-power ASK modulator extends output dynamic range in low power consumption. Additionally, a delay-based bandpass filter is adopted in the WuRx to filter out interference from automotive applications, thus increasing the battery lifetime by reducing the probability of a false wake-up. The proposed transceiver is fabricated using 0.13- μm CMOS technology with a chip size of 2.8 mm<SUP>2</SUP> for the target frequency range of 5.8 GHz. The measured results demonstrate sensitivities of -44 and -61 dBm for the WuRx and Rx, dissipating currents of 10 μA and 19 mA from 3.3-V supply voltage, respectively. The transmitter exhibits a normal output power of +5 dBm at an operating current of 46 mA.</P>
Performance Analysis of Alamouti Scheme in Time-Varying and Spatially Correlated Channels
LEE, Eunju,PARK, Jaedon,YOON, Giwan The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.10
<P>In this paper, we analyze the performance of the 2 × 1 Alamouti scheme suggested by Alamouti, composed of the transmit space-time code and the simple linear decoding processing, in perfectly time-varying and spatially correlated channels. We derive the closed-form probability density function (PDF) of output signal-to-noise ratio (SNR) and outage probability of the Alamouti scheme as a function of spatial correlation coefficient in the consideration of no correlation in time. We observe that the performance of the Alamouti scheme is severely degraded when the channels are time-varying and spatially correlated.</P>
Photo-Assisted Electrical Oscillation in Two-Terminal Device Based on Vanadium Dioxide Thin Film
Giwan Seo,Bong-Jun Kim,Hyun-Tak Kim,Yong Wook Lee IEEE 2012 Journal of Lightwave Technology Vol.30 No.16
<P>By adjusting an infrared laser power illuminated onto a vanadium dioxide (VO<SUB>2</SUB>) thin film, we have demonstrated laser-assisted control of field-induced electrical oscillation in a planar junction device based on a VO<SUB>2</SUB> thin film. Before the illumination, the VO<SUB>2</SUB>-based two-terminal device was arranged in the electrical circuit for creating the field-induced oscillation. With the increase of the illumination power, the oscillation could be initiated, and the oscillation frequency could be also continuously and fully tuned until the extinguishment of the oscillation through the variation of the light power. The tuning sensitivity and linearity of the oscillation frequency with respect to the illumination power were evaluated as ~7.732 MHz/W and ~0.9903 (an <I>R</I> -squared value of a linear fit), respectively.</P>
Lee, Eunju,Park, Jaedon,Yim, Munhyuk,Kim, Yeongseon,Yoon, Giwan American Institute of Physics 2015 Applied Physics Letters Vol.106 No.2
<P>Flexible piezoelectric zinc oxide (ZnO)-based nanogenerators (NGs) using an aluminum nitride (AlN) interlayer are proposed for high-efficiency energy harvesting applications. The effects of the AlN interlayer on device performance are studied. Use of the AlN interlayer in ZnO-based vertically integrated NGs (VINGs) results in a significant improvement in terms of the magnitude of the output voltages of up to 200 times when compared with a ZnO-based VING without any AlN interlayer. The improved device energy conversion efficiency is mainly attributed to a high contact potential barrier that the AlN interlayer provides in VINGs, along with the relatively high dielectric constant and large Young's modulus of the AlN material. In addition, the effects of AlN thickness on the electric potential and device performance of the VINGs are investigated through observation of the output voltages of ZnO-based VINGs with thickness/position-controlled AlN interlayers. Our findings in this work are expected to provide effective and useful approaches for realizing highly energy-efficient ZnO-based NGs and their extended applications, including self-power sources and sensor devices. (C) 2015 AIP Publishing LLC.</P>