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DongSoo Lee,Juri Lee,Hyung-Gu Park,JinWook Choi,SangHyeon Park,InSeong Kim,YoungGun Pu,JaeYoung Kim,Keum Cheol Hwang,Youngoo Yang,Munkyo Seo,Kang-Yoon Lee 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper presents a wide-frequencyrange, low-power transceiver with an automatic impedance-matching calibration for TV-white-space (TVWS) application. The wide-range automatic impedance matching calibration (AIMC) is proposed for the Drive Amplifier (DA) and LNA. The optimal S22 and S11 matching capacitances are selected in the DA and LNA, respectively. Also, the Single Pole Double Throw (SPDT) switch is integrated to share the antenna and matching network between the transmitter and receiver, thereby minimizing the systemic cost. An N-path filter is proposed to reject the large interferers in the TVWS frequency band. The current-driven mixer with a 25% duty LO generator is designed to achieve the high-gain and low-noise figures; also, the frequency synthesizer is designed to generate the wide-range LO signals, and it is used to implement the FSK modulation with a programmable loop bandwidth for multi-rate communication. The TVWS transceiver is implemented in 0.13 μm, 1-poly, 6-metal CMOS technology. The die area of the transceiver is 4 mm x 3 mm. The power consumption levels of the transmitter and receiver are 64.35 mW and 39.8 mW, respectively, when the output-power level of the transmitter is +10 dBm at a supply voltage of 3.3 V. The phase noise of the PLL output at Band 2 is -128.3 dBc/Hz with a 1 MHz offset.
Lee, Jong Min,Shin, Soon Young,Yoon, Hyuk,Lee, Mi So,Lee, You Ri,Koh, Dongsoo,Lee, Young Han 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.3
A novel compound, 5-(2,3-dimethoxyphenyl)-3-(1-hydroxynaphthalen-2-yl)-N-(4-methoxyphenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamide (designated DK115) was synthesized, and its antitumor efficacy was assessed. Exposure of DK115 to HCT116 human colon cancer cells inhibited cellular proliferation and clonogenicity. DK115 induced cell cycle arrest at the G1 phase. DK115 downregulated cyclin D1 expression, whereas upregulated p53 and p21 expressions. DK115-induced p21 was not observed in HCT116 cells lacking the p53 gene ($p53^{-/-}$), suggesting that DK115 induces p21 expression via p53. These data demonstrate that a novel synthetic DK115 compound may possess antitumor activity through the induction of tumor suppressor p53-mediated G1 cell cycle arrest.
Lee, DongSoo,Cho, SungHun,Ryu, Hocheol,Pu, YoungGun,Yoo, Sang-Sun,Lee, Minjae,Hwang, Keum Cheol,Youngoo, Youngoo Yang,Lee, Kang-Yoon IEEE 2018 IEEE transactions on industrial electronics Vol.65 No.9
<P>In this paper, the design of a signal conditioning analog front-end (AFE) IC for an automotive piezo-resistive type pressure sensor is presented. To improve the pressure-sensing accuracy and compensate for variations in the pressure sensor and signal conditioning IC, gauge factor calibration, digital automatic offset, and gain calibration are proposed and implemented with low power consumption. By using a high-resolution analog-to-digital converter and digital-to-analog converter, the digital automatic calibration circuit can guarantee linearity of output voltage with respect to pressure to within 0.5%. As the analog signal is converted to a digital signal, accuracy in the AFE IC improves. To improve the reliability in the automotive environment, over-voltage and reverse-voltage protection circuits are integrated with the electrostatic discharge protection circuit. Also, electromagnetic interference is reduced by using the proposed spread spectrum clock generator.</P> <P>The proposed design is implemented using 2P4M 0.35 μm CMOS technology with an active area of 1.94 mm × 1.94 mm. Full output ranges from 0.5 to 4.5 V. The ratiometricity error is within ±0.25% when the supply voltage is changed by ±10%. Current consumption is 4.7 mA from a 5 V supply. The output accuracy is within ±0.5% with respect to the PVT variations.</P>
Lee, DongSoo,Lee, Juri,Park, Hyung-Gu,Choi, JinWook,Park, SangHyeon,Kim, InSeong,Pu, YoungGun,Kim, JaeYoung,Hwang, Keum Cheol,Yang, Youngoo,Seo, Munkyo,Lee, Kang-Yoon The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper presents a wide-frequency-range, low-power transceiver with an automatic impedance-matching calibration for TV-white-space (TVWS) application. The wide-range automatic impedance matching calibration (AIMC) is proposed for the Drive Amplifier (DA) and LNA. The optimal $S_{22}$ and $S_{11}$ matching capacitances are selected in the DA and LNA, respectively. Also, the Single Pole Double Throw (SPDT) switch is integrated to share the antenna and matching network between the transmitter and receiver, thereby minimizing the systemic cost. An N-path filter is proposed to reject the large interferers in the TVWS frequency band. The current-driven mixer with a 25% duty LO generator is designed to achieve the high-gain and low-noise figures; also, the frequency synthesizer is designed to generate the wide-range LO signals, and it is used to implement the FSK modulation with a programmable loop bandwidth for multi-rate communication. The TVWS transceiver is implemented in $0.13{\mu}m$, 1-poly, 6-metal CMOS technology. The die area of the transceiver is $4mm{\times}3mm$. The power consumption levels of the transmitter and receiver are 64.35 mW and 39.8 mW, respectively, when the output-power level of the transmitter is +10 dBm at a supply voltage of 3.3 V. The phase noise of the PLL output at Band 2 is -128.3 dBc/Hz with a 1 MHz offset.
The Role of Civil Society on South Korean Policy toward North Korea
Wootae Lee(이우태),Dongsoo Kim(김동수) 21세기정치학회 2014 21세기 정치학회보 Vol.24 No.2
With democratization, South Korean society has opened up foreign policy issues for debate among the populace. In Kim Dae-jung and Roh Moo-hyun administrations, large proportions of the organizations in South Korean civil society are in favor of cooperation and improving inter-Korean relations. This orientation of groups within South Korean civil society toward the North affects South Korean general people’s perception on North Korea and South Korean engagement policy in Kim Dae-jung and Roh Moo-hyun administrations. However, in Lee Myung-bak administration, the role of South Korean civil society to South Korean policy toward North Korea was rapidly decreased even though the importance and number of civil society was still maintained. The purpose of this paper is to analyze how and why the role of South Korean civil society has been differed between Kim and Roh administrations and Lee administration in the policy making process toward North Korea. The supports from political leadership and trust on the political sector and civil society have an effect to the role of civil society in the inter-Korean relations between Kim Dae-jung and Roh Moo-hyun administrations and Lee Myung-bak administrations.
Myoung-Jae Lee,Chang Bum Lee,Dongsoo Lee,Seung Ryul Lee,Jihyun Hur,Seung-Eon Ahn,Man Chang,Young-Bae Kim,U-In Chung,Chang-Jung Kim,Dong-Sik Kim,Hosun Lee IEEE 2010 IEEE electron device letters Vol.31 No.7
<P>An alternative approach of controlling bistable resistance switching in NiO was investigated. By fabricating a multilayer structure of three NiOx layers with varying oxygen content, bistable resistance switching could be localized. By varying the enveloping oxygen partial pressure during NiOx layer deposition from 10% to 30%, improved resistance and switching voltage distribution from cycle to cycle was achieved. In addition, more localized switching could emulate sub-100-nm-sized cells showing decreased reset current values on the order of 100 A. X-ray photon spectroscopy analysis shows a clear grading near the interfaces of successive NiO layers.</P>