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Effect of Cork Extract on the Mechanical Property of Thermoplastic Polyurethane
( Taehoon Oh ),( Seung-hyun Cho ),( Bumyong Yoon ),( Hyejung Yoon ),( Jonghwan Suhr ) 한국복합재료학회 2023 Composites research Vol.36 No.2
Thermoplastic polyurethane (TPU) is a material whose mechanical properties change according to the phase separation of its unique internal microstructure and is therefore used in various industries. Use of TPU as composites helps in improving the desirable characteristics and properties in accordance with usage. Eco-friendly fillers one of the fillers are on the rise and those are mostly used for reinforcing role. Suberin, which can be extracted from cork, is the main component of cork. It is known to serve high damping property of elastomer composite. The original chemical structure of Suberin is an aliphatic polyester aggregate. In this research, Suberin is obtained after depolymerization into an oligomer having 2 or 3 ester bonds through alkaline hydrolysis. The extracted suberin was added to the matrix which is thermoplastic polyurethane as an eco-friendly filler for improving vibration damping property. As a result, when 10 wt% of suberin was added into thermoplastic polyurethane the existing trade-off relationship was overcome. And it is attained the elastic modulus and damping factor at room temperature improving 92 and 59%, respectively, compared to the original matrix. Those results are from the interaction between the microstructure of TPU and suberin.
( Taehoon Oh ),( Hyun Jung Seo ),( Kyu Taek Lee ),( Han Jo Kim ),( Hwi Jun Kim ),( Ji-hye Lee ),( Hae Il Cheong ),( Eun Young Lee ) 대한신장학회 2015 Kidney Research and Clinical Practice Vol.34 No.1
MYH9-related disorder is an autosomal dominant disease caused by a mutation in the MYH9 gene, which encodes nonmuscle myosin heavy chain IIA (NMMHC-IIA). This disease is characterized by giant platelets, thrombocytopenia, granulocyte inclusion bodies, proteinuria, and high-pitch sensorineural deafness. Nephropathy has been observed in 30% of patients with MYH9-related disorder. The characteristic features are early onset proteinuria and rapidly progressing renal disorder. However, the prognosis of MYH9 nephropathy remains unclear. Herein, we describe a 36-year-old woman who presented with proteinuria and was diagnosed with MYH9 nephropathy via renal biopsy and gene analysis. Her proteinuria improved after administration of an angiotensin II receptor blocker, but was aggravated after changing to a calcium channel blocker. Copyright & 2015. The Korean Society of Nephrology. Published by Elsevier. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Oh, Jeongyoon,Koo, Choongwan,Hong, Taehoon,Jeong, Kwangbok,Lee, Minhyun Elsevier 2017 APPLIED ENERGY Vol.202 No.-
<P>The residential progressive electricity tariffs (RPETs) in South Korea were recently changed, which can significantly affect the economic viability of the solar photovoltaic system. In this regard, this study aimed to investigate the economic impact of RPET5 in implementing the building-integrated photovoltaic blind (BIPB) using an advanced finite element model. First, the nine-node-based finite element model with improved prediction accuracy for estimating the technical performance of the BIPB (FEM9-node BIPB) was developed. Second, the life cycle cost approach was used to evaluate the effect of RPETs on the economic viability of the BIPB in terms of the energy demand and supply. The main findings of this study can be summarized as follows. First, the prediction accuracy of the developed FEM9-node BIPB was proved to be superior to the existing model, in which the estimation results can be found within a short time in an easy way. Second, considering the RPETs, it showed a tendency that the higher the amount of electricity consumption in a household was, the more improved the economic viability of the BIPB became. However, it should be also analyzed which tariff zones in the RPETs can be covered by the amount of electricity generated from the BIPB, because it can significantly affect the economic viability of the BIPB. Third, after the revision of the RPET5, the economic viability of the BIPB under the grid-connected utilization plan was determined to be superior. This study can be used for end-user to maximize the economic viability in implementing the BIPB. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Effect of electron-beam irradiation on leakage current of AlGaN/GaN HEMTs on sapphire
Oh, Seung Kyu,Song, Chi Gyun,Jang, Taehoon,Kwak, Joon Seop The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.6
This study examined the effect of electron-beam (E-beam) irradiation on the electrical properties of n-GaN, AlGaN and AlGN/GaN structures on sapphire substrates. E-beam irradiation resulted in a significant decrease in the gate leakage current of the n-GaN, AlGaN and HEMT structure from $4.0{\times}10^{-4}A$, $6.5{\times}10^{-5}A$, $2.7{\times}10^{-8}A$ to $7.7{\times}10^{-5}A$, $7.7{\times}10^{-6}A$, $4.7{\times}10^{-9}A$, respectively, at a drain voltage of -10V. Furthermore, we also investigated the effect of E-beam irradiation on the AlGaN surface in AlGaN/GaN heterostructure high electron mobility transistors(HEMTs). The results showed that the maximum drain current density of the AlGaN/GaN HEMTs with E-beam irradiation was greatly improved, when compared to that of the AlGaN/GaN HEMTs without E-beam irradiation. These results strongly suggest that E-beam irradiation is a promising method to reduce leakage current of AlGaN/GaN HEMTs on sapphire through the neutralization the trap.
Oh, Jeongyoon,Koo, Choongwan,Hong, Taehoon,Cha, Seung Hyun Elsevier 2018 APPLIED ENERGY Vol.228 No.-
<P><B>Abstract</B></P> <P>There has been growing interest in the distributed solar generation (DSG) system in accordance with the ‘Post-2020 Climate Change Agreement’, especially for the reduction of greenhouse gas emissions from buildings. In this respect, this study aimed to develop an integrated model for estimating the techno-economic performance of the DSG system on building façades, with a focus on energy demand and supply. The integrated model was developed in five stages: (i) definition of design variables affecting the DSG system on building façades; (ii) establishment of a standard database for the DSG system on building façades using energy simulation; (iii) technical analysis of the DSG system on building façades using the finite element method; (iv) economic analysis of the DSG system on building façades through life-cycle cost analysis; and (v) systemization. Detailed analyses were conducted in three aspects: (i) nonlinearity analysis; (ii) validation of the developed model; and (iii) practical application (to the ‘S’ apartment block in South Korea). With the newly developed integrated model (i-FEM), it was found that the technical performance of the DSG system could be accurately estimated in only 6 s: (i) heating energy demand (1.01%); (ii) cooling energy demand (9.27%); and (iii) building energy supply (3.55%). It is expected that decision-makers (e.g. construction managers or facility managers) can use the newly developed integrated model (i-FEM) to evaluate the potential impact of the DSG system on building façades in a timely and accurate manner.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel approach was developed for analyzing the building energy demand and supply. </LI> <LI> The techno-economic performance of the DSG system on building façades was estimated. </LI> <LI> The finite element method was used to simplify the complex conventional approach. </LI> <LI> The effectiveness and efficiency of the integrated model (i-FEM) were validated. </LI> <LI> The usability, integrity, and practicality of the novel approach were enhanced. </LI> </UL> </P>
Easy Preparation of Self-Assembled High-Density Buckypaper with Enhanced Mechanical Properties
Oh, Jun Young,Yang, Seung Jae,Park, Jun Young,Kim, Taehoon,Lee, Kunsil,Kim, Yern Seung,Han, Heung Nam,Park, Chong Rae American Chemical Society 2015 NANO LETTERS Vol.15 No.1
<P>A controlled assembly and alignment of carbon nanotubes (CNTs) in a high-packing density with a scalable way remains challenging. This paper focuses on the preparation of self-assembled and well-aligned CNTs with a densely packed nanostructure in the form of buckypaper via a simple filtration method. The CNT suspension concentration is strongly reflected in the alignment and assembly behavior of CNT buckypaper. We further demonstrated that the horizontally aligned CNT domain gradually increases in size when increasing the deposited CNT quantity. The resultant aligned buckypaper exhibited notably enhanced packing density, strength, modulus, and hardness compared to previously reported buckypapers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-1/nl5033588/production/images/medium/nl-2014-033588_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5033588'>ACS Electronic Supporting Info</A></P>