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표면 플라즈몬 공명 신호의 증폭을 위한 새로운 금 콜로이드 센서칩 제조와 특성 연구
임정혁,이경호,고광락,강신원,김재호 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
New gold colloidal film sensor chips were employed to enhance the sensitivity of the Surface Plasmon Resonce (SPR). Au collodal solutions were synthesized, and Au colloidal films were fabricated by immobilization of colloid on vacuum deposited Au film through the coupling agent of 1,8-diaminooctane. Specific interaction of human IgG antibody to human antigen was monitored by in situ SPR measurement from both a smooth and a Au colloidal films. Au colloidal film sensor chips resulted in 27 % enhancements effect for the same reaction on SPR angle shifts compared to a smooth Au film.
A Non-binary C-R Hybrid DAC for 12 b 100 MS/s CMOS SAR ADCs with Fast Residue Settling
Jae-Geun Lim,Je-Min Jeon,Jun-Ho Boo,Yoon-Bin Im,Jae-Hyuk Lee,Sung-Han Do,Young-Jae Cho,Michael Choi,Gil-Cho Ahn,Seung-Hoon Lee 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.4
This work proposes two versions of a 12 b 100 MS/s successive-approximation register (SAR) ADC based on a non-binary C-R hybrid DAC. The proposed DAC applies a non-binary weighted capacitor array to the 7 MSBs to meet the settling requirement of the DAC output and determines the remaining 5 LSBs using the reference voltages generated from a simple resistor string to reduce the DAC area significantly. The Version 1 ADC in a 28 ㎚ CMOS adopts a synchronous SAR logic and a comparator with a tail capacitor and a reset switch to minimize power consumption. The Version 2 ADC in a 0.18 ㎛ CMOS employs an asynchronous SAR logic with simple meta-stability correction logic to achieve high-speed operation. The Version 1 ADC which has an active die area of 0.042 ㎟ shows a maximum signal-to-noise-and-distortion ratio (SNDR) and spurious-free dynamic range (SFDR) of 62.3 and 77.3 ㏈, respectively, consuming 1.3 ㎽ with a 1.0 V supply voltage. The Version 2 ADC is based on a similar analog circuit topology, showing a maximum SNDR and SFDR of 60.1 and 73.5 ㏈, respectively, with an active die area of 0.30 ㎟, operating at a 1.8 V supply voltage.
전자기식 충격흡수구조의 설계를 위한 동특성 해석 및 실험
이미선,배재성,황재혁,임재혁,Yi, Mi-Seon,Bae, Jae-Sung,Hwang, Jae-Hyuk,Im, Jae-Hyuk 항공우주시스템공학회 2012 항공우주시스템공학회지 Vol.6 No.1
A shock absorber with magnetic effects is suggested for a lunar space-ship expected to launch in 2025. The device consists of a copper steel combined tube, two magnets, and a piston. The piston is designed to move a magnet through the tube when it is pushed by an external impact. While the magnet is moving in the tube, it generates the eddy current force with the copper part of the tube and it also makes the large friction force with the steel part of the tube. Beside, it gets resistive forces against its movement such as the magnetic force with a steel-ring at the first time of the movement and the repulsive force with a same pole opposed magnet at the end time of the movement. In this thesis, results of analyses and experiments of each force are represented and the expected performance of the electromagnetic shock absorber is drawn from the results.
Im, Ji Hyuk,Yang, Seung Jae,Yun, Chang Hun,Park, Chong Rae IOP Pub 2012 Nanotechnology Vol.23 No.3
<P>Carbon/TiO<SUB>2</SUB> composite nanotubes were fabricated via a very simple electrospinning process and their dual functionalities of adsorptivity and photocatalytic activity were evaluated using Rhodamine B (RhB) as a model organic pollutant. A poly(vinyl alcohol) (PVA) aqueous solution was directly electrospun into a coagulation bath containing titanium (IV) tetraisopropoxide (TTIP) solution so that PVA-core/TiO<SUB>2</SUB>-shell composite nanofibers were formed through the in situ sol–gel reaction of TTIP. The carbon/TiO<SUB>2</SUB> composite nanotubes were then fabricated by heat treatment of composite nanofibers under nitrogen atmosphere. By using several characterization methods, we confirmed that the resultant nanotubes consisted of anatase TiO<SUB>2</SUB> nanocrystallites embedded in a carbonaceous matrix. The prepared nanotubes exhibited fast adsorption of RhB with high capacity compared with a commercial porous carbon, and they also showed the photocatalytic decomposition activity for the dye molecules under UV irradiation comparable to the degradation by P-25 and ST-01 (commercial TiO<SUB>2</SUB>). Finally, the carbon/TiO<SUB>2</SUB> composite nanotubes exhibited several cycle performances of adsorption–photodegradation for RhB. This indicates that the composite nanotubes can adsorb and photodecompose organic pollutants repeatedly without additional activating processes.</P>
Im, Ji Hyuk,Ko, Nakeun,Yang, Seung Jae,Park, Hye Jeong,Kim, Jaheon,Park, Chong Rae The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.7
<P>A methyl-modified metal–organic framework (m-TiBDC) shows significantly enhanced hydrostability than unmodified TiBDC, and thus can maintain almost intact CO<SUB>2</SUB> gas adsorption capacity even after its immersion in water for 2 h while TiBDC does not.</P> <P>Graphic Abstract</P><P>A methyl-modified metal–organic framework (m-TiBDC) exhibiting significantly enhanced hydrostability than unmodified TiBDC maintains its framework structure and also CO<SUB>2</SUB> gas adsorption capacity even after its immersion in water for 2 hours. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00138a'> </P>
Simple Preparation of Anatase Titanium Dioxide Nanoparticles by Heating Titanium-Organic Frameworks
Im, Ji Hyuk,Kang, Eunyoung,Yang, Seung Jae,Park, Hye Jeong,Kim, Jaheon,Park, Chong Rae Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
Thermal degradation of titanium-containing metal-organic frameworks (MOFs; MIL-125 and MIL-125-$NH_2$ at $350^{\circ}C$ for 6 h in air produced $TiO_2$ nanoparticles of ca. 10 nm in diameter. Scanning electron and transmission electron microscope analyses indicated that those nanoparticles were aggregated randomly within each crystalline particle of their MOF precursors. The $TiO_2$ nanoparticles prepared from MIL-125-$NH_2$ exhibited higher activity for the degradation of 4-chlorophenol under visible light.
Effect of Liquid Fuels on the PAH and Soot Formation
Jae Hyuk Choi(최재혁),In Kyu Im(임인규),Byoung Chul Choi(최병철),Hwan-Ho KIM(김환호),Kyoung Woo Lee(이경우),Mann Eung Kim(김만응) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In order to investigate the effect of benzene (C?H?) and toluene (C?H?) mixing on polycyclic aromatic hydrocarbon (PAH) and soot formation, benzene and toluene have been mixed in counterflow pure ethylene diffusion flame. Laser induced incandescence (LII) and laser induced fluorescence (LIF) techniques have been adopted to measure relative concentrations of soot volume fraction and polycyclic aromatic hydrocarbon (PAH) concentration, respectively. The experimental results showed that the mixing of liquid fuels in ethylene diffusion flame produces more PAHs and soot than that of pure ethylene diffusion flame. Especially, LII signal of 20% toluene flame increased about 3.5 times more than that of pure ethylene diffusion flame. It is considered that methyl (CH₃) radical generated by the initial pyrolysis of benzene can be contributed to the enhancement of PAH and soot formation, through the formation of propargyl (C₃H₃) radical.
( Jae Hoon Moon ),( Min Kyung Hyun ),( Ja Youn Lee ),( Jung Im Shim ),( Tae Hyuk Kim ),( Hoon Sung Choi ),( Hwa Young Ahn ),( Kyung Won Kim ),( Do Joon Park ),( Young Joo Park ),( Ka Hee Yi ) 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.4
Background/Aims: We evaluated the prevalence and characteristics of thyroid nodules detected by thyroid ultrasound (US) at health checkups and the associated clinical parameters. Methods: A total of 72,319 subjects who underwent thyroid US at three health checkup centers in Korea from January 2004 to December 2010 were included in this study. The correlations between the presence of thyroid nodules and other clinical parameters were analyzed. Results: The prevalence of thyroid nodules and cysts was 34.2% (n = 24,757). Thyroid nodules were more prevalent in women and older age groups. Among the subjects with thyroid nodules with size information (n = 24,686), 18,833 (76.3%) had nodules measuring ≤ 1.0 cm. Women and older age groups showed higher proportion of larger nodules. Percentage of women, age, body mass index (BMI), waist circumference, body fat composition, blood pressure, and the level of fasting glucose, total cholesterol, and low density lipoprotein cholesterol were higher in the subjects with thyroid nodules compared to those without nodules. The prevalence of metabolic syndrome and overt/subclinical thyrotoxic state was higher in the subjects with thyroid nodules. In the multivariable logistic regression analysis, women, age, BMI, metabolic syndrome, and thyrotoxicosis were independently associated with the presence of thyroid nodules. Conclusions: The high prevalence of thyroid nodules in people who underwent thyroid US at a health checkup suggests that increased detection of thyroid nodules resulted in an increased prevalence in the general population. However, metabolic disturbances may also have contributed to the increase in thyroid nodule prevalence in Korea.
Genome-wide linkage analysis for ocular and nasal anthropometric traits in a Mongolian population
Im, Sun-Wha,Kim, Hyun-Jin,Lee, Mi-Kyeong,Yi, Jae-Hyuk,Jargal, Ganchimeg,Sung, Joo-Hon,Cho, Sung-Il,Kim, Jong-Il Korean Society for Biochemistry and Molecular Bion 2010 Experimental and molecular medicine Vol.42 No.12
Anthropometric traits for eyes and nose are complex quantitative traits influenced by genetic and environmental factors. To date, there have been few reports on the contribution of genetic influence to these traits in Asian populations. The aim of this study was to determine the genetic effect and quantitative trait locus (QTL) of seven traits eyes- and nose-related anthropometric measurements in an isolated Mongolian population. Frontal and lateral photographs were obtained from 1,014 individuals (434 males and 580 females) of Mongolian origin. A total of 349 short tandem repeat markers on 22 autosomes were genotyped for each individual. Heritability estimates of the seven ocular and nasal traits, adjusted for significant covariates, ranged from 0.48 to 0.90, providing evidence for a genetic influence. Variance-component linkage analyses revealed 10 suggestive linkage signals on 5q34 (LOD = 3.2), 18q12.2 (LOD = 2.7), 5q15 (LOD = 2.0), 9q34.2 (LOD = 1.9), 5q34 (LOD = 1.9), 17q22 (LOD = 1.9), 13q33.3 (LOD = 2.7), 1q36.22 (LOD = 1.9), 4q32.1 (LOD = 2.1) and 15q22.31 (LOD = 2.9). Our study provides the first evidence that genetics influences nasal and ocular traits in a Mongolian population. Additional collaborative efforts will further extend our understanding of the link between genetic factors and human anthropometric traits.