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Kim, Cham,Kim, Chang Eun,Baek, Ju Young,Kim, Dong Hwan,Kim, Jong Tae,Ahn, Ji Hyeon,Lopez, David Humberto,Kim, Taewook,Kim, Hoyoung American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.19
<P>Various chemical reaction processes have been adopted to synthesize Bi2Te3 thermoelectric nanomaterials for achieving remarkably low thermal conductivities, but chemical contaminations were usually pointed out as flaws, severely deteriorating electrical conductivities. We devised a novel water-based chemical reaction process for a Bi2Te2.7Se0.3 nanocompound in which the possibility for chemical contaminations was reduced. We successfully synthesized a small and highly distributed Bi2Te2.7Se0.3 nanocompound with high purity and adequately packed it via a spark plasma sintering process to produce a nanobulk structure. The resulting nanobulk specimen exhibited a physical density as high as the theoretical one with highly distributed nanograins; thus,. we were able to obtain remarkably high electrical,conductivity while maintaining thermal: conductivity as lbw as possible. The synergistic effect was greatly induced between the transport properties;. thus, the highest reported figure of merit value was achieved for n-type Bi2Te3 in the bulk phase.</P>
Kim, Cham,Baek, Ju Young,Kim, Dong Hwan,Kim, Jong Tae,Lopez, David Humberto,Kim, Taewook,Kim, Hoyoung THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.60 No.-
<P><B>Abstract</B></P> <P>A polycrystalline WSe<SUB>2</SUB> nanocompound was produced via a brief thermal reaction between the atomic elements. It should grow along the in-plane direction with covalent bonds rather than along the through-plane direction with van der Waals forces, leading to both crystallographic and morphological anisotropies. Not only the anisotropies should structurally induce strong phonon scattering but they alleviate possible electron scattering at the van der Waals forces; thus, we greatly reduced thermal conductivity while minimizing electrical conductivity loss. The decoupled conductivities resulted in enhancement in figure of merit, by approximately 70% at 350°C, thus affording a promising material for mid-temperature thermoelectric operations.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Taewook,Park, June Hyun,Lee, Sang-gil,Kim, Soyoung,Kim, Jihyun,Lee, Jungho,Shin, Chanseok Korean Society for Molecular and Cellular Biology 2017 Molecules and cells Vol.40 No.8
MicroRNAs (miRNAs) are essential small RNA molecules that regulate the expression of target mRNAs in plants and animals. Here, we aimed to identify miRNAs and their putative targets in Hibiscus syriacus, the national flower of South Korea. We employed high-throughput sequencing of small RNAs obtained from four different tissues (i.e., leaf, root, flower, and ovary) and identified 33 conserved and 30 novel miRNA families, many of which showed differential tissuespecific expressions. In addition, we computationally predicted novel targets of miRNAs and validated some of them using 5' rapid amplification of cDNA ends analysis. One of the validated novel targets of miR477 was a terpene synthase, the primary gene involved in the formation of disease-resistant terpene metabolites such as sterols and phytoalexins. In addition, a predicted target of conserved miRNAs, miR396, is SHORT VEGETATIVE PHASE, which is involved in flower initiation and is duplicated in H. syriacus. Collectively, this study provides the first reliable draft of the H. syriacus miRNA transcriptome that should constitute a basis for understanding the biological roles of miRNAs in H. syriacus.
Kim, Cham,Baek, Ju Young,Kim, Dong Hwan,Kim, Jong Tae,Lopez, David Humberto,Kim, Taewook,Kim, Hoyoung Elsevier 2017 Journal of Alloys and Compounds Vol.722 No.-
<P><B>Abstract</B></P> <P>We studied a polycrystalline p-type WSe<SUB>2</SUB> semiconductor for thermoelectric applications. The polycrystalline WSe<SUB>2</SUB> nanocompound was prepared via a thermal reaction process of tungsten and selenium elements and it was sintered to produce a bulk structure using spark plasma sintering equipment. The resulting bulk specimen showed different morphological aspects, in which we observed irregularly-shaped grains along the direction perpendicular to the sintering pressing direction (i.e., along transversal direction) while finding thin layers along the parallel direction (i.e., along longitudinal direction). The specimen recorded a significantly low longitudinal thermal conductivity possibly because longitudinal phonon transport should be hindered due to the thin layers. Electron transport along the longitudinal direction might not be greatly interrupted by the morphological characteristics because the specimen recorded high carrier mobility along the direction resulting in lower electrical resistivity than that of a single crystalline equivalent. The specimen also showed moderate carrier concentration, which led to a plausible Seebeck coefficient. Since the specimen exhibited the significantly low thermal conductivity with the electrical properties, it recorded a higher figure of merit than the equivalent, which is the highest thermoelectric performance for p-type WSe<SUB>2</SUB> in bulk phase ever developed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new thermal reaction process was devised for a polycrystalline WSe<SUB>2</SUB> nanocompound. </LI> <LI> The nanocompound showed morphological anisotropy led to decoupling of conductivities. </LI> <LI> The highest thermoelectric performance was done for bulk phase WSe<SUB>2</SUB> ever reported. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim Jihun,Han Chang-Hyun,Kim Yeonhak,Lee Taewook,Yang Changsop,Choi Young Eun,Kang Byoung-Kab,Kim Kun Hyung,Yang Gi Young,Kim Eunseok 사단법인약침학회 2023 Journal of Acupuncture & Meridian Studies Vol.16 No.6
Background: Pharmacopuncture therapy and acupotomy are commonly used in combination for Conventional Korean Medicine Treatments (CKMT) for the treatment of patients with lumbar spinal stenosis (LSS). The aim of this study is to evaluate the effect and safety of combining pharmacopuncture therapy and acupotomy in the treatment of LSS. Methods: This study is designed as a pragmatic, assessor-blinded, randomized controlled trial with two parallel arms in a 1:1 ratio. A total of 104 participants diagnosed with LSS will be randomly assigned to an experimental group (pharmacopuncture therapy and acupotomy in addition to CKMT) or a control group (only CKMT). Patients in both groups will receive treatment two times weekly for 6 weeks. The primary outcome will be the mean change on the 100-mm visual analog scale (VAS) from the baseline to the end of the treatment (week 6). The secondary outcomes will include the mean change in the 100-mm VAS from baseline to week 10 and week 14, respectively. Proportion of patients who achieve the clinically important difference, Zurich Claudication Questionnaire, Roland-Morris disability questionnaire, self-reported maxium walking distance, EuroQol 5-dimension 5-level, and Patients’ Global Impression of Change will also be assessed. Adverse events will be assessed at each visit. The outcomes will be measured for a total of 14 weeks, including a treatment period of 6 weeks and follow-up of 4, 8 weeks. Discussion: The results of this trial will confirm the effect and safety of combining pharmacopuncture therapy and acupotomy in the treatment of patients with LSS.
An Approach for Reducing Computational Time for Real-Time Autonomous Vehicle Tracking
TaeWook Hwang,Seonhee Kim,Sujeong Kim,Gilsang Jang,Jihye Park,Seongha Park,Eric T. Matson,Kyungsup Kim 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
Autonomous vehicles are familiar to public in daily life nowadays. For a recreational purpose, autonomous vehicles such as drones are commonly adopted for people. However with the easy accessibility, those autonomous vehicles can be a threat to anyone. Moreover, to detect and prevent those possible threats, real-time detection and tracking system is required. With the requirements, we propose a real-time communication between post-processing device and autonomous vehicle tracking sensor, which is a radar and a noise reduction method for post-processing. With the proposed method, a Frequency Modulated Continuous Wave (FMCW) radar can be utilized for real-time monitoring of autonomous vehicle. In this paper, we used an audio file recorded through a FMCW radar for distance tracking. The recorded audio data were processed by Inverse Fast Fourier Transformation (IFFT) and noise cancellation. We propose a data selection formula for faster IFFT processing and a noise reduction method in real-time communication. Also we propose a simple Android application to receive the processed data that sent to as distances of the target autonomous vehicle in time in real-time, so that a user can conveniently watch an autonomous vehicle near the radar.
Kim, Yura,Kim, Youngho,Choi, Jinhee,Kang, Taewook,Choi, Inhee Elsevier 2017 Analytica chimica acta Vol.967 No.-
<P><B>Abstract</B></P> <P>Reactive oxygen species (ROS) are strong oxidants, and have attracted considerable attention in both biological and environmental fields. Although various methods for ROS detection, including optical and electrochemical techniques, have been developed, they still face challenging issues in terms of poor sensitivity, reproducibility, stability, and <I>in vivo</I> applicability. Here, we present a sensitive and selective optical sensor for ROS detection, based on single plasmonic nanoprobes and redox-active cytochrome <I>c</I> (Cyt <I>c</I>)-mediated plasmon resonance energy transfer. By measuring the spectral changes of plasmonic nanoprobes, derived from the unique molecular absorption of Cyt <I>c</I> in accordance with the redox state, calibration curves for H<SUB>2</SUB>O<SUB>2</SUB>, a representative ROS, in various media were obtained over a wide concentration range from 100 mM to 1 nM. Limit of detection and limit of quantification in accordance with the used medium were determined from 8.3 to 12.8 nM and from 27.6 to 42.7 nM, respectively. Selectivity coefficients for major interfering solutes were much lower than 0.1 indicating a good selectivity for ROS. From the dynamic spectral changes, we sensitively monitored ROS generated in <I>Caenorhabditis elegans</I> (<I>C. elegans</I>) exposed to graphene oxide. Based on the calibration curves, we also determined ROS levels in various aquatic environments, such as river streams and a small pond, as a way of environmental monitoring. We believe that our approach could provide an avenue for achieving dynamic and sensitive monitoring of ROS in toxicological, biological, and environmental fields in the future.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single nanoparticle-based optical sensor for monitoring reactive oxygen species (ROS). </LI> <LI> More sensitive monitoring and wider detection range than commercially available method. </LI> <LI> Limit of detection and quantification were determined from 8.3 to 12.8 nM and from 27.6 to 42.7 nM, respectively. </LI> <LI> Selectivity coefficients for major interfering solutes were much lower than 0.1. </LI> <LI> Determination of nanomolar level ROS in biological and environmental samples. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>