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Duksoo Kim,Byungjoon Kim,Sangwook Nam IEEE 2015 IEEE Transactions on Circuits and Systems II: Expr Vol. No.
<P>A linearization technique of a transconductor circuit is proposed in this brief. By adopting a two-path feedforward architecture, the G(m3) component of the transconductor vanishes and a highly linear V -to-I conversion is achieved. This technique consists of self-biased inverters only, and it can be applied to transconductors with differential inputs. It also has an advantage in process scaling and precise bias control is not necessary. A tunableG(m) - C high-pass filter for the baseband of a frequency-modulated continuous-wave radar system is implemented using these linearized transconductors. The filter is synthesized with a high-order admittance method. The designed filter is fabricated in a 0.13-mu m CMOS process. The filter cutoff frequency can be tuned from 0.15 to 0.75 MHz with a current consumption value of 11-36 mA. An in-band input-referred third-order intercept point of + 19.4 dBm and a 1-dB compression point of + 5.35 dBm are measured, demonstrating a highly linear filter operation.</P>
Electrical Characteristics of the Backgated Bottom-Up Silicon Nanowire FETs
DukSoo Kim,YoungChai Jung,MiYoung Park,ByungSung Kim,SuHeon Hong,MinSu Choi,MyungGil Kang,YunSeop Yu,Dongmok Whang,SungWoo Hwang IEEE 2008 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.7 No.6
<P>We report the electrical characteristics of backgated silicon nanowire (SiNW) FETs at temperatures ranging from 300 to 160 K. The voltage drop along the intrinsic part of the silicon nanowire (SiNW) was obtained by modeling the source/drain contacts as Schottky diodes. The field effect mobility values obtained from the extracted intrinsic voltage drop showed activation behaviors in the given temperature range. The activation energy was smaller than that of previously reported Ge nanowires.</P>
Kim, Duksoo,Hong, Sungchae,Jung, Sunhwa,Jung, Yunjin,Kim, Young Mi Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of Pharmaceutical Sciences Vol.98 No.11
<P>Metronidazole (MTZ) is a drug of choice for protozoal infections such as luminal amoebiasis. We designed and synthesized N-nicotinoyl-2-{2-(2-methyl-5-nitroimidazol-1-yl)ethyloxy}-D,L-glycine (NMG) as a colon-specific prodrug of MTZ. The synthetic yield of NMG was about 34%. The apparent partition coefficient of MTZ was greatly reduced by the chemical modification. While (bio)chemically stable in the contents of the upper intestine, NMG was rapidly cleaved to liberate MTZ on incubation with the cecal contents of rats. MTZ metabolized quickly in the cecal contents at least partly by a microbial nitroreductase, suggesting that the metabolism of MTZ is relevant to its bioactivation leading to amoebicidal action. The systemic absorption, analyzed by the blood concentration and urinary recovery of NMG, was very low after oral administration of NMG. In parallel with this, whereas MTZ disappeared mostly during the transit of the proximal small intestine, a substantial amount of NMG remained in the small intestine moving down to the large intestine where it metabolized rapidly. Moreover, comparing systemic absorption of MTZ after oral administration of NMG or MTZ, NMG markedly reduced the systemic absorption. These results suggest that NMG is a potential colon-specific prodrug of MTZ which improves therapeutic and toxicological properties. © 2009 Wiley-Liss, Inc. and the American Pharmacists Association J Pharm Sci 98:4161–4169, 2009</P>
Kim, Heejung,Kim, Duksoo,Choi, Daekyu,Jeon, Hyunchu,Han, Jungoh,Jung, Yunjin,Kong, Hyesik,Kim, Young Mi Informa Healthcare 2008 DRUG DELIVERY Vol.15 No.1
<P> N,N'-bis(5-aminosalicyl)-L-cystine (5-ASA-Cys) was prepared by a simple synthetic route. 5-ASA-Cys was not degraded in pH 1.2 and 6.8 buffer solutions, and in the homogenates of the upper intestine. In marked contrast, 5-ASA-Cys was deconjugated extensively to liberate 5-ASA in the cecal contents. Upon oral administration of 5-ASA-Cys to rats, the plasma concentration of 5-ASA-Cys was extremely low and the urinary recovery of 5-ASA-Cys was ∼ 10% of the dose. These results suggest that 5-ASA-Cys administered orally is delivered efficiently to the large intestine followed by deconjugation to liberate 5-ASA and cystine.</P>
김종오(Kim Jong-o ),김덕수(Kim Duksoo ),이원석(Lee Wonseok) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
Sensing technology has been widely investigated and utilized for gas detection. Due to the different applicability and inherent limitations of different gas sensing technologies, researchers have been working on different scenarios with enhanced gas sensor calibrations. This paper reviews the descriptions, comparison and recent developments in existing gas sensing technologies. A classification of sensing technologies is given, based on the variation of electrical and other properties.
김종오(Kim Jong-o),김덕수(Kim Duksoo),장기동(Jang Gidong) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
Sensing technology has been widely investigated and utilized for displacement measurement. Due to the different applicability and inherent limitations of different sensing technologies, researchers have been working on different scenarios with enhanced displacement sensor calibrations. This paper reviews the descriptions, comparison and recent developments in existing displacement sensing technologies. A classification of sensing technologies is given, based on the variation of electrical and other properties.
A High Gain and High Harmonic Rejection LNA Using High Q Series Resonance Technique for SDR Receiver
Byungjoon Kim,Duksoo Kim,Sangwook Nam 한국전자파학회JEES 2014 Journal of Electromagnetic Engineering and Science Vol.14 No.2
This paper presents a high gain and high harmonic rejection low-noise amplifier (LNA) for software-defined radio receiver. This LNA exploits the high quality factor (Q) series resonance technique. High Q series resonance can amplify the in-band signal voltage and attenuate the out-band signals. This is achieved by a source impedance transformation. This technique does not consume power and can easily support multiband operation. The chip is fabricated in a 0.13-μm CMOS. It supports four bands (640, 710, 830, and 1,070MHz). The measured forward gain (S21) is between 12.1 and 17.4 dB and the noise figure is between 2.7 and 3.3 dB. The IIP3 measures between - 5.7 and - 10.8 dBm, and the third harmonic rejection ratios are more than 30 dB. The LNA consumes 9.6 mW from a 1.2-V supply.