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Ju, H.,Kim, J. Elsevier Sequoia 2016 Journal of Alloys and Compounds Vol.664 No.-
Nanostructured graphene/Bi<SUB>2</SUB>Te<SUB>3</SUB> composites were fabricated with either Bi<SUB>2</SUB>Te<SUB>3</SUB> powder or nanowires (NWs) and various graphene contents, and their thermoelectric properties were investigated. The Bi<SUB>2</SUB>Te<SUB>3</SUB> powder was produced from Bi<SUB>2</SUB>Te<SUB>3</SUB> beads with a conventional ball milling process, whereas the Bi<SUB>2</SUB>Te<SUB>3</SUB> NWs were fabricated with a solution-phase synthetic route. The composites with a graphene content of 0.5 wt.% exhibited enhanced power factors, presumably because of an improvement in the Seebeck coefficients of the samples, which overwhelmed the reduction in electrical conductivity. In addition, the introduction of graphene reduced the lattice thermal conductivity of the composites because it caused the formation of many boundaries in the Bi<SUB>2</SUB>Te<SUB>3</SUB> matrix. The maximum thermoelectric figure of merit (ZT) of 0.4 was achieved at 300 K with the 1 wt.%-graphene/Bi<SUB>2</SUB>Te<SUB>3</SUB>-NW composite; it was larger than that of the pristine Bi<SUB>2</SUB>Te<SUB>3</SUB> NWs and graphene/Bi<SUB>2</SUB>Te<SUB>3</SUB>-powder composites.
Ju, H.,Lee, J.K.,Lee, J.,Lee, J. Elsevier 2012 Current Applied Physics Vol.12 No.1
The fast and selective growth of cuprous oxide (Cu<SUB>2</SUB>O) nanorods into anodic aluminum oxide (AAO) templates is achieved under optimized alkaline conditions via electrochemical deposition. The growth rate of Cu<SUB>2</SUB>O nanorods at room temperature reached 360 nm/min, the fastest rate reported to date. The synthesis of Cu<SUB>2</SUB>O nanorods by applying a constant current by using Cu<SUB>2</SUB>O nanotubes as a transition state is extensively discussed; a Pt pottery-shaped layer played a key role as a seed layer for the fast Cu<SUB>2</SUB>O growth. We report here the existence of regions of nanostructured Cu<SUB>2</SUB>O based on our studies and previous relevant works, which include potential-pH curves for Cu<SUP>2+</SUP>-lactate solutions.
Ju, H.,Kim, J. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.8
Tin selenide (SnSe) based thermoelectric materials with varying amounts of embedded silicon carbide (SiC) particles were fabricated, and their thermoelectric properties were investigated. The SiC particles were evenly distributed in the SnSe matrix, thereby leading to the formation of the SiC/SnSe composite samples. The introduction of SiC into the SnSe matrix improved the power factors, owing mainly to an increase in the Seebeck coefficient, and a decrease in the thermal conductivity arising from the formation of phonon-scattering centers. Consequently, a ZT of 0.125 (at 300K) was obtained for the SiC/SnSe composite with a SiC content of 1wt%; this value was larger than that of the pristine SnSe. The results of this study indicate that the introduction of SiC particles into the SnSe matrix constitutes an efficient strategy for achieving thermoelectric enhancement for solid-state applications.
Springer Science + Business Media 2016 Analog Integrated Circuits and Signal Processing Vol.87 No.3
<P>A multi-channel pipeline analog-to-digital converter (ADC) with two-step non-overlapping clock generation is presented. Op-amp sharing and reference buffer sharing between channels are implemented without a front-end sample-and-hold amplifier for low power consumption. The proposed clock generator can easily implement short reset phases between non-overlapping clocks to remove the memory effect from opamp sharing. The prototype 4-channel ADCs are implemented in a 0.11 mu m CMOS process. The 10 bit ADC achieve 56.6 dB (9.1 bit ENOB) SNDR and 72.2 dB SFDR with 3 MHz input frequency. Each ADC slice occupies 0.4 mm(2) and consumes 13 mW at 62 MS/s sampling frequency under 1.1 V supply.</P>
Ju, H.,Kim, T.,Chung, C.-M.,Park, J.,Nikawa, T.,Park, K.,Choi, I. PHARMACEUTICAL SOCIETY OF JAPAN 2017 Biological & pharmaceutical bulletin Vol.40 No.5
<P>The homeostasis of muscle properties depends on both physical and metabolic stresses. Whereas physical stress entails metabolic response for muscle homeostasis, the latter does not necessarily involve the former and may thus solely affect the homeostasis. We here report that metabolic suppression by the hypometabolic agent 3-iodothyronamine (TIAM) induced muscle cell atrophy without physical stress. We observed that the oxygen consumption rate of C2C12 myotubes decreased 40% upon treatment with 75 mu m T1AM for 6h versus 10% in the vehicle (dimethyl sulfoxide) control. The TIAM treatment reduced cell diameter of myotubes by 15% compared to the control (p<0.05). The cell diameter was reversed completely by 9h after TIAM was removed. The TIAM treatment also significantly suppressed the expression levels of heat shock protein 72 and alpha B-crystallin as well as the phosphorylation levels of Akt1, mammalian target of rapamycin (mTOR), S6K, forkhead box O1 (FoxO1) and FoxO3. In contrast, the levels of ubiquitin E3 ligase MuRF1 and chymotrypsin-like activity of proteasome were significantly elevated by TIAM treatment. These results suggest that T1AM-mediated metabolic suppression induced muscle cell atrophy via activation of catabolic signaling and inhibition of anabolic signaling.</P>
Ju, H.,Kim, M.,Kim, J. Springer Science + Business Media 2016 Journal of materials science Materials in electron Vol.27 No.4
<P>Nanostructured bulk composites consisting of Bi2Te3 nanowires (NWs) with graphene particles are fabricated with different graphene content, and their thermoelectric properties were examined. As-prepared graphene materials were evenly distributed into the Bi2Te3 NW matrix, leading to the formation of the graphene/Bi2Te3 composite structures. The sintered composite with 0.5 wt% graphene content generated improved thermoelectric power factor of 688.9 mu W/m K-2, compared to the Bi2Te3 NW sample without grapheme, because of the enhanced Seebeck coefficient of the composite originating from the decreased carrier concentration. Our synthesized graphene/Bi2Te3 NW hybrid composites are promising route to achieve high performance of thermoelectric materials.</P>
중형 선박엔진의 커넥팅 라드 강도 검토를 위한 작용하중 모델링에 대한 연구
함주혁 한라대학교 2007 論文集 Vol.10 No.-
개발용 선박 중형엔진의 피스톤 연결봉에 대한 강도 해석을 위한 작용하중들을 고찰하고 선박중형엔진 연결봉의 작용하중을 모델링하여 보았다. 본 구조물 해석 검토의 근본적인 목적은 제시된 선박 중형엔진의 피스톤과 크랭크축을 잇는 연결봉에 대한 최대인장, 압축하중 및 조립하중에 대한 구조적 신뢰성 및 내구성을 확보함에 있으며 중형엔진 개발을 위한 기술축척의 일환인 중형엔진의 구동부에 대한 구조물의 해석의 한 수행 항목이다. 1000 rpm에서의 구동부의 왕복질량에서 야기되는 관성력에 기인한 인장력과 연소실의 150bar에 달하는 최대 개스 폭발압력에 따른 압축력에 대한 하중, 볼트 체결력 및 부시(Bush)하중 등을 고려한 정적하중 해석을 수행하여 이들의 응력 및 변위량을 확인하고 피로분석을 행하기 위한 하중을 설정키 위한 연구이다, 이들 결과치는 엔진개발을 위한 중요한 기준자료로 활용될 수 있다.