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Han, Jin,Yu, Taekyung,Im, Sang Hyuk Elsevier 2017 Journal of industrial and engineering chemistry Vol.52 No.-
<P><B>Abstract</B></P> <P>Uniform silica particles were synthesized by synergistic combination of sodium 4-styrene sulfonate (NaSS) anionic surfactant and organic amine base catalyst such as ethylenediamine (EDA) or diethylenetriamine (DETA). The EDA and DETA organic amine base catalysts could promote the growth reaction rate so that they produced larger silica particles compared to the NH<SUB>4</SUB>OH base catalyst because the organic amines provide more basic micro-environment near the surface of the silica particle due to multiple amine groups in a single molecule. Accordingly, the size of the silica particle was 450±12nm (NH<SUB>4</SUB>OH), 725±21nm (EDA), and 942±130nm (DETA) in similar pH conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Uniform silica particles were synthesized by organic amine base catalysts. </LI> <LI> Organic amine base catalysts provide more basic micro-environment. </LI> <LI> Organic amine base catalysts promote the growth reaction rate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
MATLAB/Simulink를 이용한 자동차용 고분자전해질형 연료전지 시스템의 단순화된 성능 모델링 연구
황태경(Taekyung Hwang),김경일(Kyungil Kim),신동유(Dongyou Shin),윤희준(Heejun Yoon),김한상(Han-Sang Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study is primarily concerned with the simplified performance modeling of automotive PEMFC(proton-exchange membrane fuel cell) systems. To this end, the PEMFC stack and BOP components(e.g. turbo blower, humidifier, and cooling circuit etc.) are modeled by using MATLAB/Simulink environment. As a result, the efficiency and performance of the automotive PEMFC system are mainly analyzed with various operating conditions. It is expected that the results of this study will contribute to the development of robust simulation tools for automotive PEMFC system.
Synthesis of Cu-Pd nanoplates and their catalytic performance for H2O2 generation reaction
Tang, Zengmin,Han, Geun-Ho,Jung, Euiyoung,Seo, Myung-gi,Lee, Kwan-Young,Kim, Woo-Sik,Yu, Taekyung Elsevier 2018 Molecular catalysis Vol.452 No.-
<P>We reported on an aqueous-phase synthesis of copper-palladium (Cu-Pd) nanoplates consisting of 5 nm-sized Pd nanoparticles deposited on Cu nanoplates. In the present synthesis, ascorbic acid was used as a reducing agent to prevent galvanic replacement. By controlling the experimental conditions, we could control the weight percent of Pd in the nanoplates from 0.56% to 2.02%. The Cu-Pd nanoplates with Pd content of 2.02% exhibited high catalytic performance in the direct H2O2 generation reaction.</P>
한규홍(Kyuhong Han),이태경(Taekyung Lee),정창모(Changmo Jung) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper describe development process and results of a battery emulation system using power conversion unit. The battery emulation system can be a substitute for a real battery system in the test environment which is hard to use a real battery system. For developing this battery emulation system, a HIL(Hardware-In-the-Loop) simulator which has a realtime battery system model and a power conversion unit which supply real electric power are connected. The test result for comparison between the real battery system result and the battery emulation system result has similar tendency and values. It is possible to emulate battery characteristics if this battery emulation system is used in the developing process for electric propulsion systems.
Effects of Water-loading Weight Loss on the Physiological Response in College Wrestlers
( Jinkyung Cho ),( Taekyung Han ) 한국운동생리학회(구 한국운동과학회) 2020 운동과학 Vol.29 No.3
PURPOSE: The purpose of this study was to evaluate the effects of water-loading weight loss on physiologic response. METHODS: Thirteen consenting university wrestlers (weight 71.5±8.0 kg, BMI 25.0±2.0 kg/m²) randomly divided into the weight loss (WL) group (n=6) and water-loading weight loss (WWL) group (n=7). Wrestlers performed 2-week weight loss program targeting average of 5-10% of body weight reduction, under the supervision of a coach. Participants were instructed to drink 1.5-2 L and 6-7 L daily during the first week in the WL and WWL groups, respectively. Both groups were gradually reduced water intake and didn’t drink water the day before weighing. Anthropometric characteristics, hematocrit (HCT), serum electrolytes, aldosterone, and cortisol were measured before and after weight loss. Data were analyzed with two-way ANOVA using SPSS. The significance level was set at p<.05. RESULTS: After 2 weeks, the weight (p=.004), BMI (p<.001), lean body mass (p<.001), body water composition (p<.001), and SBP (p=.046) were reduced significantly in both groups. However, there was no statistically significant between-group difference in all parameters of body composition and SBP. The HCT and chloride (Cl-) decreased in both WL and WWL groups (p=.018 and p=.006, respectively). Serum aldosterone and cortisol significantly increased in both groups (p<.001). In particular, cortisol was significantly lower in the WWL than in WL group. CONCLUSIONS: This study suggested that a large-volume hydration before water restriction for weight loss can be a safe method.
Lee, Jonghun,Han, Junebeom,Yeo, Chang Su,Lim, Taekyung,Park, Sangyoon,Ju, Sanghyun IOP 2016 Nanotechnology Vol.27 No.50
<P>The motion, in particular the flow speed and dropping height, of a water droplet was observed using a tin oxide (SnO<SUB>2</SUB>) nanowire transistor with a polyurethane (PU) nanofiber mesh as a selective filter. The changes in the SnO<SUB>2</SUB> nanowire transistor characteristics, particularly the threshold voltage and on-current, were due to the adsorbed water molecules that acted as electron donors on the surface of the oxide nanowire semiconducting channel. The role of the PU nanofiber mesh, allowing the passage of water vapor while blocking liquid water, was to restrict the direct contact between the water droplet and the oxide nanowire semiconducting channel and electrodes, which could cause abnormal transistor characteristics. The selective filtering properties of the PU nanofiber mesh could be controlled by changing the number of PU layers.</P>
Exploiting GPU-based Parallelism for Quantum Computer Simulation: A Survey
Sengthai Heng,Taekyung Kim,Youngsun Han 대한전자공학회 2020 IEIE Transactions on Smart Processing & Computing Vol.9 No.6
As the advent of quantum computers comes closer, research on quantum algorithms is actively being conducted in various fields. Quantum computer simulation is mainly employed for the study of quantum algorithms due to the imperfections of quantum computers. Quantum computer simulation using classical computers has encountered significant challenges in emulating quantum algorithms, where computational time and memory usage increase exponentially due to superposition and entanglement. To resolve these problems, there have been many studies to exploit GPU-based parallelism in quantum computer simulation. In this review paper, we present various studies on implementing quantum computer simulations using single or multiple GPUs. We also analyze the performance of these studies in terms of speedup and summarize the simulation methods.
Cho, Ahyoung,Han, Geun-Ho,Kim, Jin Soo,Lee, Jae-Chul,Ahn, Jae-Pyoung,Lee, Kwan-Young,Yu, Taekyung Elsevier 2018 Chemical physics letters Vol.712 No.-
<P><B>Abstract</B></P> <P>The development of a new concept of support for catalytic activity is important in the development of catalysts. Dual-supports, composed of a mixture of two metal oxides, can increase catalytic activities by controlling the oxidation state of metal catalysts, as well as give multi-functionality to the catalyst, including photocatalytic properties and reusability. We report an aqueous-phase synthesis of Pd/ and Pt/TiO<SUB>2</SUB>/Fe<SUB>3</SUB>O<SUB>4</SUB> hybrid nanostructures. The synthesized nanostructures had metal nanoparticles with sizes of less than 2.8 nm. The synthesized nanostructures exhibited high H<SUB>2</SUB>O<SUB>2</SUB> selectivity toward the H<SUB>2</SUB>O<SUB>2</SUB> generation and also showed potential as a magnetic separable catalyst for both H<SUB>2</SUB>O<SUB>2</SUB> synthesis and photocatalytic reaction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aqueous-phase synthesis of Pd/ and Pt/TiO<SUB>2</SUB>/Fe<SUB>3</SUB>O<SUB>4</SUB> hybrid nanostructures. </LI> <LI> The Pd/TiO<SUB>2</SUB>/Fe<SUB>3</SUB>O<SUB>4</SUB> hybrid nanostructures exhibited high selectivity toward the H<SUB>2</SUB>O<SUB>2</SUB> generation reaction. </LI> <LI> The metal/TiO<SUB>2</SUB>/Fe<SUB>3</SUB>O<SUB>4</SUB> hybrid nanostructures showed magnetic separable reusability toward the photocatalytic reaction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The metal/TiO<SUB>2</SUB>/Fe<SUB>3</SUB>O<SUB>4</SUB> hybrid nanostructures exhibited not only high selectivity toward the H<SUB>2</SUB>O<SUB>2</SUB> generation reaction but also magnetic separable reusability toward the photocatalytic reaction.</P> <P>[DISPLAY OMISSION]</P>