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Load contour method for biaxial design of reinforced concrete L-shaped structural walls
Eom, Tae-Sung,Nam, Hye-Seong Elsevier 2017 ENGINEERING STRUCTURES Vol.146 No.-
<P><B>Abstract</B></P> <P>Biaxial behavior of L-shaped walls differs from that of rectangular or circular columns with symmetrical solid sections, due to the unsymmetrical section geometry. In this study, a straightforward design method for biaxially loaded L-shaped walls is developed by modifying the existing load contour method. Using the strain-compatibility section analysis method, a parametric study on the prototype L-shaped walls is performed to investigate the interaction of biaxial moment strengths at constant axial load. The results show that, due to the unsymmetrical section geometry of L-shaped walls, the contour of biaxial moment strengths is highly unsymmetrical in shape and significantly affected by the moment directions and axial loads. Based on the results, elliptical contour equations for the biaxial moment strengths of L-shaped walls are proposed. In addition, a design example illustrating the biaxial design procedure using the proposed method is given.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A load contour method for biaxial design of L-shaped walls is proposed. </LI> <LI> The contour shape of biaxially loaded L-shaped walls is unsymmetrical. </LI> <LI> The contour shape is highly affected by axial loads and moment directions. </LI> <LI> Non-dimensional elliptical contour equations for L-shaped walls are proposed. </LI> <LI> Design example using the proposed load contour method is given. </LI> </UL> </P>
Eom, Yong-Sung,Son, Ji-Hye,Lee, Hak-Sun,Choi, Kwang-Seong,Bae, Hyun-Cheol,Choi, Jeong-Yeol,Oh, Tae-Sung,Moon, Jong-Tae The Korean Microelectronics and Packaging Society 2015 마이크로전자 및 패키징학회지 Vol.22 No.1
An electro-plating technology on a cured isotropic conductive pattern with a hybrid Cu paste composed of resin matrix, copper, and solder powders has been developed. In a conventional technology, Ag paste was used to perform a conductive pattern on a PCB or silicon substrate. From previous research, the electrical conductive mechanism and principle of the hybrid Cu paste were concisely investigated. The isotropic conductive pattern on the PCB substrate was performed using screen-printing technology. The optimum electro-plating condition was experimentally determined by processing parameters such as the metal content of the hybrid Cu paste, applied current density, and time for the electroplating in the plating bath. The surfaces and cross-sections were observed using optical and SEM photographs. In conclusion, the optimized processing conditions for Cu electro-plating technology on the conductive pattern were a current density of $40mA/cm^2$ and a plating time of 20min on the hybrid Cu paste with a metal content of 44 vol.%. More details of the mechanical properties and processing conditions will be investigated in further research.
( 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.
Sung-Jae Park,Sang-Bum Bae,Su-Kyoung Kim,Tae-Gwan Eom,Seung-Il Song 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.3
Objective: This study examined the potential of the in vitro osteogenesis of microtopographically modified surfaces, RBM (resorbable blasting media) surfaces, which generate hydroxyapatite grit-blasting. Methods: RBM surfaces were modified hydroxyapatite grit-blasting to produce microtopographically modified surfaces and the surface morphology, roughness or elements were examined. To investigate the potential of the in vitro osteogenesis, the osteoblastic cell adhesion, proliferation, and differentiation were examined using the human osteoblast-like cell line, MG-63 cells. Osteoblastic cell proliferation was examined as a function of time. In addition, osteoblastic cell differentiation was verified using four different methods of an ALP activity assay, a mineralization assay using alizarin red-s staining, and gene expression of osteoblastic differentiation marker using RT-PCR or ELISA. Results: Osteoblastic cell adhesion, proliferation and ALP activity was elevated on the RBM surfaces compared to the machined group. The cells exhibited a high level of gene expression of the osteoblastic differentiation makers (osteonectin, type I collagen, Runx-2, osterix). imilar data was represented in the ELISA produced similar results in that the RBM surface increased the level of osteocalcin, osteopontin, TGF-beta1 and PGE2 secretion, which was known to stimulate the osteogenesis. Moreover, alizarin red-s staining revealed significantly more mineralized nodules on the RBM surfaces than the machined discs. Conclusion: RBM surfaces modified with hydroxyapatite grit-blasting stimulate the in vitro osteogenesis of MG-63 cells and may accelerate bone formation and increase bone-implant contact.
Tae Ryool Koo,Keun-Yong Eom,In Ah Kim,Jai Young Cho,Yoo-Seok Yoon,Dae Wook Hwang,Ho-Seong Han,Jae-Sung Kim 대한방사선종양학회 2014 Radiation Oncology Journal Vol.32 No.2
Purpose: To find the applicability of adjuvant radiotherapy for extrahepatic bile duct cancer (EBDC), we analyzed the pattern of failure and evaluate prognostic factors of locoregional failure after curative resection without adjuvant treatment. Materials and Methods: In 97 patients with resected EBDC, the location of tumor was classified as proximal (n = 26) and distal (n = 71), using the junction of the cystic duct and common hepatic duct as the dividing point. Locoregional failure sites were categorized as follows: the hepatoduodenal ligament and tumor bed, the celiac artery and superior mesenteric artery, and other sites. Results: The median follow-up time was 29 months for surviving patients. Three-year locoregional progression-free survival, progression-free survival, and overall survival rates were 50%, 42%, and 52%, respectively. Regarding initial failures, 79% and 81% were locoregional failures in proximal and distal EBDC patients, respectively. The most common site was the hepatoduodenal ligament and tumor bed. In the multivariate analysis, perineural invasion was associated with poor locoregional progression-free survival (p = 0.023) and progression-free survival (p = 0.012); and elevated postoperative CA19-9 (≥37 U/mL) did with poor locoregional progression-free survival (p = 0.002), progression-free survival (p < 0.001) and overall survival (p < 0.001). Conclusion: Both proximal and distal EBDC showed remarkable proportion of locoregional failure. Perineural invasion and elevated postoperative CA19-9 were risk factors of locoregional failure. In these patients with high risk of locoregional failure, adjuvant radiotherapy could be considered to improve locoregional control.
Eom, Tae Joong,Sung, Jae Hee,Kee, Chul-Sik,Ko, Do-Kyeong,Lee, Jongmin,Choi, Eun Seo IEEE 2008 Photonics Technology Letters Vol.20 No.12
<P> A wavelength swept broadband source based on a sub-10-femtosecond (fs) pulse laser and a spatial filtering method was developed for the application to frequency-domain optical coherence tomography (FD-OCT). The use of the sub-10-fs laser with a galvano scanner operating at a high repetition rate provided a fast tunable broadband light source, which tuned the spectral component across the spectral bandwidth of 110 nm at 1-kHz repetition rate. The spectrally filtered light beam had 0.5-nm instantaneous spectral linewidths at 1-mW average output power. The implemented FD-OCT system clearly imaged a narrow air gap between glass plates with an axial resolution of 5 <EM><TEX>$\mu$</TEX></EM>m, which proved a potential for the application of a short pulse laser source to the FD-OCT system. The proposed wavelength swept source scheme can secure mode-hopping-free operation at fast tuning speed, which could be applicable for the FD-OCT system properly. </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.