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Lee, Youn Yeop,Lee, Jae Kook,Park, Kwan Ho,Kim, Seo-Yeon,Roh, Seong Woon,Lee, Sang-Beom,Choi, Youngcheol,Lee, Sung-Jae International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.11
<P>A novel Gram-stain-negative, facultatively anaerobic, non-motile and short rod-shaped bacterium, strain KBL009<SUP>T</SUP>, was isolated from the larval gut of <I>Hermetia illucens</I>. Strain KBL009<SUP>T</SUP> grew optimally at 37 °C, at pH 6.0 and with 1–2 % (w/v) NaCl. The 16S rRNA gene sequence of strain KBL009<SUP>T</SUP> showed 97.6 % similarity to that of <I>Paenalcaligenes hominis</I> CCUG 53761A<SUP>T</SUP> indicating its classification with the genus <I>Paenalcaligenes</I>. The major fatty acids were cyclo-C<SUB>17 : 0</SUB>, C<SUB>16 : 0</SUB> and summed feature 2 (comprising C<SUB>14 : 0</SUB> 3-OH/iso-C<SUB>16 : 1</SUB>). The respiratory quinones were ubiquinone-8 (Q-8), predominating, and a minor amount of Q-7. The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, one unknown aminolipid and five unknown polar lipids. The polyamine pattern contained predominantly putrescine and relatively high amounts of spermidine. The betaproteobacterial-specific 2-hydroxyputrescine could only be detected in trace amounts. The G+C content of genomic DNA was 56.1 mol%. Results from DNA–DNA hybridization with <I>P. hominis</I> KCTC 23583<SUP>T</SUP> unambiguously demonstrated that strain KBL009<SUP>T</SUP> represents a novel species in the genus <I>Paenalcaligenes</I>. Based on phenotypic, genotypic and phylogenetic characterization, the novel species <I>Paenalcaligenes hermetiae</I> sp. nov. is proposed. The type strain is KBL009<SUP>T</SUP> ( = KACC 16840<SUP>T</SUP> = JCM 18423<SUP>T</SUP>). An emended description of the genus <I>Paenalcaligenes</I> is also provided.</P>
심장박동 조절장치를 위한 1V 아날로그 CMOS 전단 처리기
채영철(Youngcheol Chae),이정환(Jeongwhan Lee),이인희(Inhee Lee),한건희(Gunhee Han) 대한전자공학회 2009 電子工學會論文誌-SD (Semiconductor and devices) Vol.46 No.1
심장박동 조절장치를 위한 저전압 저전력 전단 처리기를 제안한다. 제안된 회로는 80 ㎐에서 120 ㎐의 대역폭을 가지는 4차의 스위치드 커패시터 필터와 0 ㏈에서 24 ㏈까지 0.094 ㏈ 간격으로 전압이득의 조절이 가능한 전압증폭기를 구현하였다. 낮은 전압에서 동작하고, 전력소모를 극소화 하기위해서 인버터 기반의 스위치드 커패시터 회로를 사용하였으며, 인버터가 가지는 작은 전압이득을 보상하기 위해서 상호상관 기법을 사용하였다. 제안된 회로는 0.35-㎛ CMOS 공정을 이용하여 구현되었으며, 5㎑의 샘플링 주파수에서 80-㏈의 SFDR을 가진다. 이때 전력소모는 1 V의 전원전압에서 330 ㎻에 불과하다. A low-voltage, low-power analog CMOS front-end for a cardiac pacemaker is proposed. The circuits include a 4th order switched-capacitor (SC) filter with a passband of 80-120 ㎐ and a SC variable gain amplifier whose control range is from 0 to 24-㏈ with 0.094 ㏈ step. An inverter-based switched-capacitor circuit technique is used for low-voltage operation and ultra-low power consumption, and correlated double sampling technique is used for reducing the finite gain effect of an inverter. The proposed circuit has been designed in a 0.35-㎛ CMOS process, and it achieves 80-㏈ SFDR at 5-㎑ sampling frequency. The power consumption is only 330 ㎻ at 1-V power supply.
나노 윤활유를 이용한 압축기 습동부 재질의 경도에 따른 윤활특성 평가
한영철(Youngcheol Han),구본철(Boncheol Ku),이광호(Kwangho Lee),황유진(Yujin Hwang),이재근(Jaekeun Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In this study, lubrication characteristics of sliding members were compared with the change of the hardness of friction surfaces and the application of nano-oil. The materials of the specimens were gray cast iron (AISI 35, AISI 60) and nickel chromium molybdenum steel (AISI 4320). The Friction coefficients and the temperature variations of on the frictional surfaces were measured by disk-on-disk tribotester under the condition of fixed rotating speed. The friction surfaces were observed by scanning electron microscope (SEM). In the results, the friction coefficients of the disk surface were increased as hardness difference was increased. The friction coefficient lubricated in nano-oil was less than mineral oil. This is because a spherical nano particle plays a tiny ball bearing between the frictional surfaces, improved the lubrication characteristics.
심장박동 조절장치를 위한 저전압 저전력 델타 시그마 모듈레이터
채영철(Youngcheol Chae),이정환(Jeongwhan Lee),이인희(Inhee Lee),한건희(Gunhee Han) 대한전자공학회 2009 電子工學會論文誌-SD (Semiconductor and devices) Vol.46 No.1
심장박동 조절장치를 위한 저전압 저전력 델타 시그마 모듈레이터를 제안하였다. 제안된 회로는 feedforward 구조를 이용한 델타 시그마 모듈레이터 단을 계단식 형태로 설계하였으며, 이를 통하여 저전압 환경에서도 비교적 높은 해상도를 구현할 수 있었다. 인버터 기반의 스위치드 커패시터 회로를 이용하여 전력소모를 최소화 하고, 낮은 전압에서도 동작 가능하도록 설계되었다. 제안된 회로는 0.35-㎛ CMOS 공정을 이용하여 구현되었으며, 샘플링 주파수가 7.6 ㎑ 이고 120㎐ 대역폭에서 61-㏈ SNDR, 63-㏈ SNR, 그리고 65-㏈ DR 을 가진다. 이때 전력소모는 1-V 전원전압에서 280 ㎻ 에 불과하다. A low voltage, low power delta-sigma modualtor is proposed for cardiac pacemaker applications. A cascade of delta-sigma modulator stages that employ a feedforward topology has been used to implement a high-resolution oversampling ADC under the low supply. An inverter-based switched-capacitor circuit technique is used for low-voltage operation and ultra-low power consumption. An experimental prototype of the proposed circuit has been implemented in a 0.35-㎛ CMOS process, and it achieves 61-㏈ SNDR, 63-㏈ SNR, and 65-㏈ DR for a 120-㎐ signal bandwidth at 7.6-㎑ sampling frequency. The power consumption is only 280 ㎻ at 1-V power supply.