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A wireless power transmission system for implantable devices in freely moving rodents.
Eom, Kyungsik,Jeong, Joonsoo,Lee, Tae Hyung,Kim, Jinhyung,Kim, Junghoon,Lee, Sung Eun,Kim, Sung June P. Peregrinus Ltd.] 2014 Medical & biological engineering & computing Vol.52 No.8
<P>Reliable wireless power delivery for implantable devices in animals is highly desired for safe and effective experimental use. Batteries require frequent replacement; wired connections are inconvenient and unsafe, and short-distance inductive coupling requires the attachment of an exterior transmitter to the animal's body. In this article, we propose a solution by which animals with implantable devices can move freely without attachments. Power is transmitted using coils attached to the animal's cage and is received by a receiver coil implanted in the animal. For a three-dimensionally uniform delivery of power, we designed a columnar dual-transmitter coil configuration. A resonator-based inductive link was adopted for efficient long-range power delivery, and we used a novel biocompatible liquid crystal polymer substrate as the implantable receiver device. Using this wireless power delivery system, we obtain an average power transfer efficiency of 15.2% (minimum efficiency of 10% and a standard deviation of 2.6) within a cage of 152015 cm3.</P>
Identification of octahedral configuration in strained SrRuO3 thin films
Eom Tae Hwa,Lee Sang A.,황재열 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.1
The compressively strained (2 2 0)-oriented SrRuO3 epitaxial thin flms were grown on c-plane SrTiO3 substrates using pulsed laser deposition. Temperature-dependent lattice changes associated with structural phase transition were investigated through in-situ X-ray difractions with varying temperature ranges from 25 to 650 °C under atmospheric conditions. Strong modulation of the in-plane lattices between the strained SrRuO3 thin flm and SrTiO3 substrate was observed. The structural phase transition from pseudo-orthorhombic to the tetragonal structure was determined at around 285 °C and epitaxial strain was persistent during the structural phase transition in the fully strained SrRuO3/SrTiO3 heterostructured thin flm. Crystal symmetry and the corresponding RuO6 octahedral confgurations were verifed that the compressively strained SrRuO3 thin flm has pseudo-orthorhombic (monoclinic, P21/m, #11) structure with the BO6 confguration of a+a– c– at 25 °C and tetragonal (I4/mcm, #140) with the octahedral tilt of a0 a0 c– above 285 °C through structural model calculations based on the difraction data of 20 individual half-order peaks.
Eom, Ju-Hong,Cho, Sung-Chul,Lee, Tae-Hyung The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper presents the parameters optimization technology for generating the first short stroke lightning current waveform($10/350{\mu}s$) which is necessary for the performance tests of components of lightning protection systems, as required under IEC 62305 and the newly amended IEC 62561. The circuit using the crowbar device specified in IEC 62305 was applied to generate the lightning current waveform. To find the proper parameters of the circuit is not easy because the circuit consists of two parts; circuit I, which relates to the front of current waveform, and circuit II, which relates to the tail. A simulation in PSpise was carried out to find main factors related to the front and tail of $10/350{\mu}s$. The lightning current generator was developed by utilizing the circuit parameters found in the simulation. In the result of experiments, new parameters of the circuits need to be changed because of the difference between the simulation and the experiment results. Using the iterative method, the optimized parameters of the circuits was determined. Also a multistage-type external coil and a damping resistor were proposed to make the efficiency of generation to enhance. According to the result in this paper, an optimized first short stroke lightning current waveform was obtained.
( Sang Hwa Eom ),( Ankur B Bamne ),( Madhav Chowdhry ),( Ihn Seok Chae ),( Tae Kyun Kim ) 대한슬관절학회 2015 대한슬관절학회지 Vol.27 No.3
Purpose: We aimed to determine the quantity and quality of research output of selected Asian countries in the field of total knee arthroplasty (TKA) in the last 10 years. Materials and Methods: Top 15 Asian countries were selected according to their gross domestic product. The Science Citation Index Expanded database was used to search for the literature published between 2004 and 2013 using “Total Knee Arthroplasty”. The numbers of articles, journals and citations and the contribution of each country were analyzed. The articles were classified according to the type of study and the relative proportion of each type was analyzed. Results: Asian surgeons have increasingly contributed to orthopedic literature on TKA for the past 10 years, but the dominant contribution came from only a few countries. The total number of articles published by Asian countries increased by 261%, with Japan producing most of the studies and China showing the maximum growth rate. The majority of studies were published in low impact factor journals. Korea published the highest proportion of articles in high impact factor journals. Clinical papers were most frequent. Conclusions: Our identification of research productivity pertaining to TKA among Asian countries gives a unique insight into the level of academic research in the field of TKA in these countries. There is a need to improve the quality of research to enhance the publishing power in high impact journals as well as the need for more basic research and epidemiological studies considering the unique differences among Asian patients undergoing TKA.
Behavior and Design of Distributed Belt Walls as Virtual Outriggers for Concrete High-Rise Buildings
Tae-Sung Eom,Hiubalt Murmu,Weijian Yi 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.2
A new lateral force-resisting structural system for concrete high-rise buildings, distributed belt wall system, is proposed. Unlike conventional belt structures, the belt walls infilling the space between perimeter columns are distributed separately along the overall building height. In this study, the force transfer mechanism and performance of the distributed belt walls, acting as virtual outriggers under lateral load, are investigated. For the reinforcement of the belt walls subjected to high shear demand, a reinforcing method using high-strength prestressing strands (i.e. PSC belt wall) is suggested, and the shear strength of the PSC belt walls is estimated based on the compression field theory. By performing nonlinear finite element analysis, the shear behavior of the PSC belt walls, including cracking and yield strengths, is investigated in detail. Based on these investigations, recommendations for the shear design of the belt walls reinforced by high-strength prestressing strands are given.
Eom, Sung-Hwan,Lee, Dae-Sung,Jung, Yeoun-Joong,Park, Jae-Hong,Choi, Ji-Il,Yim, Mi-Jin,Jeon, Jeong-Min,Kim, Hyun-Woo,Son, Kwang-Tae,Je, Jae-Young,Lee, Myung-Suk,Kim, Young-Mog Springer-Verlag 2014 Applied microbiology and biotechnology Vol.98 No.23
<P>To find more effective ways of overcoming methicillin-resistant Staphylococcus aureus (MRSA), there has been considerable interest in the use of marine-derived constituents as alternatives to control pathogenic microorganisms. In this study, we investigated whether phlorofucofuroeckol-A (PFF) isolated from the edible brown alga Eisenia bicyclis suppressed production or function of penicillin-binding protein 2a (PBP2a). The antimicrobial mode of action of PFF in MRSA was identified by measuring cell membrane integrity and using the time-kill curve method. We attempted to determine the antimicrobial effects of PFF on the expression level of the resistance determinants mecA and its regulatory genes mecI and mecR1 in MRSA by reverse transcriptase polymerase chain reaction. PFF suppressed mecI, mecR1, and mecA gene expression in a dose-dependent manner. In addition, we revealed PFF mediates the suppressive effect of PBP2a expression in MRSA by Western blot analysis. PFF suppressed production of the PBP2a protein, suggesting that PFF probably acts by controlling the methicillin resistance-associated genes involved in the cell wall and production of PBP2a. These results demonstrate that PFF isolated from E. bicyclis significantly suppressed the expression of the methicillin resistance-associated genes and production of PBP2a, which is considered the primary cause of methicillin resistance.</P>
Eom, Tae Sung,Kim, Kyung Hwan,Choi, Hyung Wook IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.6
<P>In this work, a TiO2 passivating layer was deposited on FTO glass from TiCl4 aqueous solution, and the film with TiCl4 treatment was compared with the untreated film. In order to prevent the charge recombination at the interface between the transparent-conducting oxide (TCO) substrate and the electrolyte, we employed TiCl4 treatment in dye-sensitized solar cells (DSSCs). The crystalline structure was adjusted by various TiCl4 concentrations and dipping times: 20-150 mM, and 30-120 min, respectively. The dye-sensitized solar cell using the TiO2 passivating layer was measured and found to have the maximum conversion efficiency of 3.82% owing to the effective prevention of the electron recombination. As a result, the DSSCs with the passivating layer showed better photovoltaic performance than the cells made purely of TiO2 nanoparticles. In this paper, we describe the effect of TiCl4 treatment on the TiO2 layer. (C) 2014 The Japan Society of Applied Physics</P>