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Jae-Hyeong Lee,Min-Jeong Kim,Chang-Ki Shim,Yong-Wook Kim,Min-Young Han,Kyeong-Bun Park,Jong-Ho Park,Sang-Gu Park 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
In organic pepper cultivation, aphids not only mediate various plant viruses, but also become an important cause of decreasing hot pepper growth and quality due to their continuous occurrence. The purpose of this study is to estimate the control effect of organic agricultural materials (OMA), such as plant extracts (Jerusalem artichoke(JA), pyrethrum (Py), and sweet oleander (SO)) and egg yolk and cooking oil mixture (EOY), on aphid, Aphis gossypii. In the farm field in Hongseong-gun, four types of OMA (JA, JA+EOY, conventional method (Co)) were applied, and in the organic field of NIAS, six types of OMA (EOY alone and combined with JA, Py, and SO) were treated. When four types of organic materials were treated in the farm field, the number of aphids continued to decrease compared to the untreated control until the 3rd week after treatment, but there was no significant difference between the treatments of OMA. After 28 days of treatment, the growth of red pepper was compared by treatment, there was no difference in the plant length of red pepper between untreated and treated, but the yield of red pepper was higher in JA and EOY than in untreated. In the field of the NIAS, the number of aphids continued to decrease compared to untreated until the 3rd week after treatment in EOY+SO+Py, EOY+SO+JA+Py and conventional treatments. The number of aphids showed a tendency to decrease the most. The above results suggested that the self made organic agricultural materials effectively controled the aphids occurred in organic pepper cultivation. However, the application techniques of OMA should be tested in the difference field conditions.
일반연제 발표 : 루프스 신염에 의한 말기 신부전증 환자에서 신대체 요법 유형에 따른 질병 활성도 및 누적 생존율의 비교
구영석 ( Gu Yeong Seog ),박형천 ( Park Hyeong Cheon ),박용범 ( Park Yong Beom ),강신욱 ( Kang Sin Ug ),최규헌 ( Choe Gyu Heon ),김순일 ( Kim Sun Il ),김유선 ( Kim Yu Seon ),박기일 ( Park Gi Il ),이수곤 ( Lee Su Gon ),이호영 ( Lee 대한신장학회 2002 춘계학술대회 초록집 Vol.21 No.1
Hyung-Gu Park,Jae-Hyeong Jang,Hong-Jin Kim,Young-Jun Park,SeongJin Oh,YoungGun Pu,Keum Cheol Hwang,Youngoo Yang,Kang-Yoon Lee Institute of Electrical and Electronics Engineers 2016 IEEE transactions on power electronics Vol. No.
<P>This paper presents a full-CMOS wireless power receiving unit (WPRU) with a high-efficiency 6.78-MHz active rectifier and a dc-dc converter for magnetic-resonant alliance for wireless power (A4WP) applications. The proposed high-efficiency active rectifier with delay-locked loop (DLL) is a highly efficient receiver circuit intended for use in resonant wireless charging applications with a resonant frequency of 6.78 MHz. Each MOSFET of the proposed rectifier is turned on and off based on the ac input voltage. The delay between the ac input current and the ac input voltage due to the delays of internal blocks such as voltage limiter, level shifter, gate driver, and comparator will cause the reverse leakage current, degrading the power efficiency. Thus, the proposed active rectifier adopts the DLL to compensate for the delay caused by internal blocks, which leads to the removal of reverse leakage current and the power efficiency maximization. Moreover, to maximize power efficiency, negative impedance circuit (NIC) is also adopted to minimize switching loss. In the case of dc-dc converter, phase-locked loop is adopted for the constant switching frequency in process, voltage, and temperature (PVT) variation to solve the efficiency reduction problem, especially by heat. This chip is implemented using 0.18 mu m BCD technology with an active area of 3.5 mm x 3.5 mm. When the magnitude of the ac input voltage is 8.95 V, the maximum efficiencies of the proposed active rectifier and dc-dc converter are 91.5% and 92.7%, respectively. The range of ac input voltage is 3-20 V, and the efficiency of the WPRU is about 80.86%.</P>
Gu, Da Hwi,Jo, Seungki,Jeong, Hyewon,Ban, Hyeong Woo,Park, Sung Hoon,Heo, Seung Hwae,Kim, Fredrick,Jang, Jeong In,Lee, Ji Eun,Son, Jae Sung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.22
<P>Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles under the quantum confinement regime is very challenging using conventional processes, owing to the difficulty in synthesis. Herein, we report the colloidal chemical synthesis of sub-10 nm-sized tellurium (Te)-doped Bismuth (Bi) nanoparticles with precisely controlled Te content from 0 to 5% and systematically investigate their low-temperature charge transport and thermoelectric properties. Microstructural characterization of nanoparticles demonstrates that Te ions are successfully incorporated into Bi nanoparticles rather than remaining on the nanoparticle surfaces. Low-temperature Hall measurement results of the hot pressed Te-doped Bi-nanostructured materials, with grain sizes ranging from 30 to 60 nm, show that the charge transport properties are governed by the doping content and the related impurity and nanoscale grain boundary scatterings. Furthermore, the low-temperature thermoelectric properties reveal that the electrical conductivity and Seebeck coefficient expectedly change with the Te content, whereas the thermal conductivity is significantly reduced by Te doping because of phonon scattering at the sites arising from impurities and nanoscale grain boundaries. Accordingly, the 1% Te-doped Bi sample exhibits a higher figure-of-merit ZT by similar to 10% than that of the undoped sample. The synthetic strategy demonstrated in this study offers the possibility of electronic doping of various quantum-confined nanoparticles for diverse applications.</P>
Park, Young-Jun,Park, Hyung-Gu,Lee, Juri,Oh, Seong Jin,Jang, Jae Hyeong,Kim, Sang Yun,Pu, Young Gun,Hwang, Keum Cheol,Yang, Youngoo,Seo, Munkyo,Lee, Kang-Yoon Springer-Verlag 2016 Analog integrated circuits and signal processing Vol.86 No.2
<P>This paper presents a full-CMOS receiver for an A4WP application. Two schemes were used in the proposed synchronous rectifier to increase the efficiency of the rectifier. One scheme involves a limiting reverse current that senses the output load current by changing the half synchronous rectifier mode and full synchronous rectifier mode. Another scheme proposes a high efficiency active rectifier with a delay locked loop (DLL), which is a highly efficient receiver circuit intended for use in resonant wireless charging applications with a 6.78 MHz resonant frequency. Each metal-oxide-semiconductor field-effect transistor of the proposed rectifier uses an AC input voltage for the on/off operation. Concurrently, the DLL can compensate for the delay caused by the voltage limiter, level shifter, and gate driver, which leads to the removal of the reverse leakage current and maximizes the power efficiency. This chip is implemented using 0.18 mu m technology with an active area of around 2.3 mm x 1.5 mm. When the magnitude of the AC input voltage is 10 V, the maximum efficiency of the proposed rectifier is 94.2 %. The range of AC input voltages is 3-20 V.</P>
Park, Kyung-Ah,Jin, Zhen,An, Hyeong Seok,Lee, Jong Youl,Jeong, Eun Ae,Choi, Eun Bee,Kim, Kyung Eun,Shin, Hyun Joo,Lee, Jung Eun,Roh, Gu Seob The Korean Society of Pharmacology 2019 The Korean Journal of Physiology & Pharmacology Vol.23 No.5
Obesity causes inflammation and impairs thermogenic functions in brown adipose tissue (BAT). The adipokine lipocalin 2 (LCN2) has been implicated in inflammation and obesity. Herein, we investigated the protective effects of caloric restriction (CR) on LCN2-mediated inflammation and oxidative stress in the BAT of high-fat diet (HFD)-fed mice. Mice were fed a HFD for 20 weeks and then either continued on the HFD or subjected to CR for the next 12 weeks. CR led to the browning of the white fat-like phenotype in HFD-fed mice. Increased expressions of LCN2 and its receptor in the BAT of HFD-fed mice were significantly attenuated by CR. Additionally, HFD+CR-fed mice had fewer neutrophils and macrophages expressing LCN2 and iron-positive cells than HFD-fed mice. Further, oxidative stress and mitochondrial fission induced by a HFD were also significantly attenuated by CR. Our findings indicate that the protective effects of CR on inflammation and oxidative stress in the BAT of obese mice may be associated with regulation of LCN2.
Hyung-Gu Park,Juri Lee,Jeong-a Jang,Jae-Hyeong Jang,Dong-Soo Lee,HongJin Kim,Seong Joong Kim,Sang-Gug Lee,Kang-Yoon Lee IEEE 2013 IEEE transactions on microwave theory and techniqu Vol.61 No.9
<P>An ultra-low-power super regeneration oscillator (SRO) transceiver with a 177- μW ultra-low-power phase-locked loop (PLL) and automatic quench waveform generator (QWG) is presented. In order to decrease the PLL power consumption, the leakage current is measured at the VCO control voltage node, and the control voltage is compensated by the digital part. As a result, the frequency can be maintained near 2.37 GHz after the PLL is turned off. An automatic QWG circuit that can search for the critical current of the SRO automatically is proposed in order to mitigate the process, voltage, temperature variations of the conventional QWG. This chip is implemented using 90-nm CMOS technology. The die area of the full transceiver is 3 mm × 4 mm and that of the PLL is 0.4 mm × 0.9 mm. The leakage compensation and high-Q voltage-controlled oscillator (VCO) approach results in a frequency offset of 70 kHz and fluctuation of ±75 kHz (the maximum frequency error is 145 kHz at 60 ppm). The phase noise of the VCO output at 2.37 GHz is -103.5 dBc/Hz at 1-MHz offset. The average power consumption of the PLL is 177 μW from a 1.2-V supply voltage.</P>
정형철 ( Hyeong Cheol Cheong ),노혜정 ( Hye Jung Noh ),박병현 ( Byoung Hyun Park ),조정구 ( Chung Gu Cho ) 대한내과학회 2011 대한내과학회지 Vol.80 No.5
Subacute thyroiditis is a spontaneously resolving inflammatory disease of the tyroid gland, which is usually associated with a viral infection and genetic factors. In some cases of this disorder, thyroid autoantibodies can appear, probably due to the inflammatory release of thyroid antigens, althoughtheir pathophysiological role in the course of this disease is not yet fully understood. The occurrence of Graves` disease after subacute thyroiditis is extremely rare, and only a few cases have been reported. Here, we report a case of a middle-aged woman who developed Graves` disease after subacute thyroiditis.