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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, 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 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, 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.
Multidimensional Analysis of Consumers' Opinions from Online Product Reviews
Taewook Kim,김동성,Donghyun Kim,김종우 한국경영정보학회 2019 Asia Pacific Journal of Information Systems Vol.29 No.4
Online product reviews are a vital source for companies in that they contain consumers' opinions of products. The earlier methods of opinion mining, which involve drawing semantic information from text, have been mostly applied in one dimension. This is not sufficient in itself to elicit reviewers' comprehensive views on products. In this paper, we propose a novel approach in opinion mining by projecting online consumers' reviews in a multidimensional framework to improve review interpretation of products. First of all, we set up a new framework consisting of six dimensions based on a marketing management theory. To calculate the distances of review sentences and each dimension, we embed words in reviews utilizing Google's pre-trained word2vector model. We classified each sentence of the reviews into the respective dimensions of our new framework. After the classification, we measured the sentiment degrees for each sentence. The results were plotted using a radar graph in which the axes are the dimensions of the framework. We tested the strategy on Amazon product reviews of the iPhone and Galaxy smartphone series with a total of around 21,000 sentences. The results showed that the radar graphs visually reflected several issues associated with the products. The proposed method is not for specific product categories. It can be generally applied for opinion mining on reviews of any product category.
Taewook Kim,Kiseop Choi,Kidoo Kang,Jonghyun Ha 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.1
고밀도폴리 에틸렌 고건전성용기에 담은 폐수지의 운반을 위해 원전 폐수지의 방사능 분석결과를 사용하여 운반물 등급 분류방법을 도출하였다. 원전 폐수지의 방사능 분석결과로부터 폐수지 내 핵종 존재비를 구하였고, 폐수지의 표면선량률로 핵종재고량을 평가하기 위해 MCNP 코드로 방사능대선량 환산인자를 모사하였다. 이로부터 고밀도폴리에틸렌 고건전성용기에 담은 폐수지에 대한 A형 운반물과 B형 운반물의 경계값은 1.19 TBq 이고 이를 표면선량으로 환산한 결과는 124.2 mSv/h임을 알 수 있었다. In order to transport spent resin in a high integrated container made of high density polyethylene, a method for determining transportation grade by radioactivity analysis was developed. Ratios of radioisotopes in spent resin were derived from radioactivity analysis on spent resin. Associated curie-to-dose factors were determined to estimate radioisotope inventory from surface dose rates of spent resin. From the results, Activity limit of type A package was derived to be 1.19 TBq for HIC, and the corresponding surface dose rate was found to be 124.2 mSv/h.
Kim, Taewook,Choi, Byungchul,Jung, Seunghun Elsevier 2017 Applied thermal engineering Vol.119 No.-
<P><B>Abstract</B></P> <P>The objective of the numerical analysis in this study involved the design optimization of a heat spreader with a positive temperature coefficient (PTC) heater to obtain a liquid urea-water solution of 340mL from a frozen urea-aqueous solution within 1200s. Commercial software STAR-CCM+(9.06) was used to analyze the performances of various heat spreader designs according to liquid fraction, temperature distribution, and phase-interface velocity under the same input current condition. With respect to the validation of the numerical results, those were in good agreement with the values of the urea thawing experiments. The wide lateral surface area of the heat spreader represented that the area adversely influenced the amount of molten urea-water solution within the specified time period. The heat spreader model of four hooks like turbine blades corresponded to the optimal shape necessary to prepare a sufficient amount of the molten urea-water solution for the normal de-NOx performance of a urea-SCR system within the shortest time of a cold start. In addition, it was reasonable to set the thickness of the high-density polyethylene (HDPE) coating in the range of 1–2mm to obtain a large amount of molten urea-water solution without inhibiting the heat transfer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The objective is to investigate the design optimization of a heat spreader with a PTC. </LI> <LI> Numerical results were in good agreement with the values of the urea melting experiments. </LI> <LI> Wide lateral surface area of the spreader adversely influenced the melting of frozen urea. </LI> <LI> HDPE coating thickness of 1–2mm is best to get molten urea-water solution. </LI> </UL> </P>