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김우형(Woohyung Kim),김성재(Seongjae Kim),김인동(Indong Kim) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
In this paper, we study the analytical method to predict the excitation forces for the engine system. The engine system on the construction equipment is one of the important power sources, and the characteristics of the engine decide the performance of noise and vibration for the equipment. We predict the excitation forces using the geometrical data of the crank system and the combustion pressure in the cylinder. The excited forces are represented by the torque fluctuation above the center of the crank shaft.
Kim, Tea-Yon,Song, Donghoon,Barea, Eva M.,Lee, Jung Hyun,Kim, Young Rae,Cho, Woohyung,Lee, Sungjin,Rahman, Mohammed M.,Bisquert, Juan,Kang, Yong Soo unknown 2016 Nano energy Vol.28 No.-
<P><B>Abstract</B></P> <P>Herein, the energy level alignment and electron recombination kinetics in solid state dye-sensitized solar cells (DSCs) employing a solid polymer electrolyte (SPE) have been quantitatively characterized. In order to determine the microscopic origin of the enhanced characteristics in polymer electrolytes, we carried out an extensive study of the photovoltaic properties with respect to the electrolyte type and composition, including a liquid electrolyte (LE) and various salt types and concentrations. We observed a smaller downward shift in the conduction band energy of the TiO<SUB>2</SUB> layer upon contact with the SPE as well as a retarded electron recombination rate. These led to an increase in the <I>V</I> <SUB>oc</SUB> for DSCs with an SPE, which is mostly attributable to the coordinative interactions of the ethylene oxide (EO) units in poly(ethylene oxide) (PEO) and poly(ethylene glycol) dimethyl ether (PEGDME) with metallic Li<SUP>+</SUP> ions and Ti atoms. Such coordinative interactions induce 1) the capture of Li<SUP>+</SUP> cations in the bulk of the polymer electrolyte, thereby reducing their effective concentration and 2) the facile formation of a PEO passivation layer on top of the TiO<SUB>2</SUB> layer. Therefore, it was concluded that the high <I>V</I> <SUB>oc</SUB> in solid state DSCs employing a polymer electrolyte is attributable to the coordinative properties of the EO units in PEO and PEGDME in the SPE.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The origin of high open-circuit voltage in solid state dye-sensitized solar cells with PEO-based polymer electrolyte has been firstly unveiled. </LI> <LI> New quantitative analysis of TiO<SUB>2</SUB> conduction band shift was introduced by measuring the change in the Fermi voltage with varying the concentration of the salts. </LI> <LI> PEO containing the EO groups captured cations in electrolyte and also coordinatively adsorbed on the surface of the TiO<SUB>2</SUB> layer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Woohyung Lee,Sung-Sik Han,Seung Duk Lee,Young-Kyu Kim,Seong Hoon Kim,Sang Myung Woo,Woo Jin Lee,Young Whan Koh,Eun Kyung Hong,Sang-Jae Park 한국간담췌외과학회 2012 한국간담췌외과학회지 Vol.16 No.2
Bouveret’s syndrome is a gastric outlet obstruction caused by an impacted gallstone that passes through a cholecysto-gastric or cholecysto-duodenal fistula. An elderly woman visited a local clinic with nausea and abdominal pain. Abdominal computed tomography revealed a stone that was impacted in the duodenal lumen and a fistula between the gallbladder and duodenum. Malignancy could not be excluded due to the mass in the cystic duct showing enhancement and the presence of enlarged lymph nodes on computed tomography, and increased fludeoxyglucose uptake in the cystic duct on positron emission tomography. The patient underwent simultaneous cholecystectomy, segmental duodenectomy and gastro-jejunostomy. Pathological examination exhibited chronic inflammation and no primary cancer of the gallbladder and fistula. (Korean J Hepatobiliary Pancreat Surg 2012;16:84-87)
김우형(Woohyung Kim) 한국영미어문학회 2011 영미어문학 Vol.- No.100
The purpose of this study is to investigate how to develop the curriculum for the TEE-certified English teacher training program with a quantitative and qualitative analysis. The analysis of this study indicates that trainees who participated in this training program provided highly positive reflections on the organization of the curriculum of the program. Even though positive feedback came from the analysis, change to the curriculum may have to be considered in relation to providing a blended training program. To establish a well-organized TEE-certified English teacher's training program, the curriculum should focus on developing teaching practice, knowledge in teaching, and teaching mentorship skills for trainees who qualify as TEE-certified teachers.
Cho, Woohyung,Lim, Jongchul,Kim, Tea-Yon,Kim, Young Rae,Song, Donghoon,Park, Taiho,Fabregat-Santiago, Francisco,Bisquert, Juan,Kang, Yong Soo American Chemical Society 2016 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.120 No.5
<P>The origin of the differences between the performance parameters found for dye-sensitized solar cells (DSCs) using liquid and poly(ethylene oxide)-based solid polymer electrolytes has been investigated. Limitations associated with poor polymer electrolyte penetration and ionic diffusion have been analyzed together with other effects such as the dye regeneration rate, the conduction band edge shift, and the electron recombination kinetics occurring in the solid polymer electrolyte. We have found that dye regeneration was faster for sensitized TiO2 films fully wetted with polymer electrolyte than that with liquid cells. This new result was attributed to a 0.2 eV decrease in the dye highest occupied molecular orbital energy yielding to an increase in the driving force for dye regeneration. These understandings may contribute to a further increase in the energy-conversion efficiency of DSCs employing solid polymer electrolyte.</P>