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김봉옥,박상균,방덕영 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.2
The purposes of this study were to evaluate the status of rehabilitation of spinal cord injured patients and to obtain baseline data for their comprehensive rehabilitation in Taejon and Chungnam area by questionnaire to the spinal cord injured in this area who suffered for 1 year or longer. The study population was consisted of 79 men, and 3 women. The results were as follows. 1. In age distribution, 33 cases(40.2%) were in their fourth decade and 19 cases(23.2%) were in the fifth decade. The causes of the injury were traffic accidents, hit by flying object, falls, and diseases in the order of frequency. 2. Twelve cases(14.6%) were quadriplegics, 70 cases(85.4%) were paraplegics, and 49 cases(59.87%) were job-related injury. 3. Most of the patients experienced various complications such as pain in paralyzed area, spasticity, and urinary tract infections in the order of frequency. 4. Sixty-seven cases(81.7%) were not supported by the goverment's plan to provide orthoses for the disabled with low income. 5. Among architecturaa barriers, the most common limitation to the patients was toilet(51.2%) accessibility. 6. In men responders, 34 cases(75.4%) were unable to pursue sexual intercourse. 7. The most common cause of dependency in ADL was bowel and bladder problem. With the above results, we conclude that 1) establishment of the comprehensive spinal cord injury center, 2) provision of opportunity of the continuous formal education, 3) assistance of productive activities, 4) removal of architectural barriers at home and community, and 5) obligation of registration of the disabled are necessary for the comprehensive rehabilitation of spinal cord injured patients is Taejon and Chungnam region.
Kim, Ho Jong,Han, Sang Wook,Kim, Ju Hwan,Seo, Hyun Ook,Kim, Young Dok Elsevier 2018 CURRENT APPLIED PHYSICS Vol.18 No.4
<P>Water and oil absorption behaviors of the bare and PDMS (polydimethylsiloxane)-coated PET (polyethylene terephthalate) fabrics with two different fiber strand thicknesses were investigated. PET fabrics were superhydrophobically modified by PDMS-coating via a thermal vapor deposition process. The modification greatly enhanced the selectivity of PET fabric to oil absorption from oil/ water mixture, making the PDMS-coated fabric a promising candidate as an absorbent of oil spills. We have also studied oil sorption behaviors of PDMS-coated PET fabric as a function of fiber strand thicknesses and oil viscosities. In general, fabric with a thinner fiber strand thickness showed a higher maximum oil absorption capacity, whereas uptake of the oil in thicker-fiber-absorbent was faster. Based on our results, we suggest that different absorbent structures with various fiber strand thicknesses can be chosen to maximize the efficiency of oil removal, depending on oil viscosity and available oil absorption time. (c) 2018 Elsevier B. V. All rights reserved.</P>
Kim, Il Hee,Lee, Hyerim,Yu, Areum,Jeong, Jae Hwan,Lee, Youngmi,Kim, Myung Hwa,Lee, Chongmok,Kim, Young Dok IOP 2018 Nanotechnology Vol.29 No.17
<P>NiO/NiCo<SUB>2</SUB>O<SUB>4</SUB> nanotubes with a diameter of approximately 100 nm are synthesized using Ni and Co precursors via electro-spinning and subsequent calcination processes. The tubular structure is confirmed via transmission electron microscopy imaging, whereas the structures and elemental compositions of the nanotubes are determined using x-ray diffraction, energy dispersive x-ray spectroscopy, and x-ray photoelectron spectroscopy. N<SUB>2</SUB> adsorption isotherm data reveal that the surface of the nanotubes consists of micropores, thereby resulting in a significantly higher surface area (∼20 m<SUP>2</SUP> g<SUP>−1</SUP>) than expected for a flat-surface structure (<15 m<SUP>2</SUP> g<SUP>−1</SUP>). Herein, we present a study of the catalytic activity of our novel NiO/NiCo<SUB>2</SUB>O<SUB>4</SUB> nanotubes for CO and acetaldehyde oxidation. The catalytic activity of NiO/NiCo<SUB>2</SUB>O<SUB>4</SUB> is superior to Pt below 100 °C for CO oxidation. For acetaldehyde oxidation, the total oxidation activity of NiO/NiCo<SUB>2</SUB>O<SUB>4</SUB> for acetaldehyde is comparable with that of Pt. Coexistence of many under-coordinated Co and Ni active sites in our structure is suggested be related to the high catalytic activity. It is suggested that our novel NiO/NiCo<SUB>2</SUB>O<SUB>4</SUB> tubular structures with surface microporosity can be of interest for a variety of applications, including the catalytic oxidation of harmful gases.</P>
Kim, Dae Han,Seo, Hyun Ook,Han, Sang Wook,Park, Eun Ji,Jeong, Myung-Geun,Kim, Kwang-Dae,Gantefoer, Gerd,Kim, Young Dok American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.36
<P>The oxidation behaviors of poly(3-hexylthiophene-2,5-diyl) (P3HT) thin films (similar to 60 nm thickness)/ZnO irradiated with three different wavelengths of visible light (blue, green, and red) in a humid atmosphere were studied using X-ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy. The formation of sulfoxide states upon visible light irradiation was observed in the S 2p core-level XPS spectra, and more importantly, this oxidation became pronounced with decreasing wavelength of incident light. Photo-oxidation of P3HT films also resulted in a reduction in optical absorption. In contrast to the XPS results, changes in the UV-vis absorption spectrum were rather insensitive to the wavelength of incident visible light. The wavelength dependency of the photo-oxidation of P3HT films seen in the XPS spectra is attributed to the more pronounced photoinduced oxidation of locally disordered thiophene rings on the surfaces of P3HT films under irradiation with shorter-wavelength visible light. The population of local-disordered sites that increases the optical transition gap compared to that of the well-ordered bulk P3HT film decreases from the top surface to the interior of P3HT films due to stronger interchain interactions in the interior portion of the films. Therefore, changes in the optical absorbance seen in the UV-vis absorption spectra of the entire P3HT film upon photoinduced oxidation are less sensitive to the wavelength of incident light in the visible regime.</P>
ZnO nanosheets decorated with CdSe and TiO2 for the architecture of dye-sensitized solar cells.
Kim, Young Tae,Park, Mi Yeong,Choi, Kang Ho,Tai, Wei Sheng,Shim, Won Hyun,Park, Sun-Young,Kang, Jae-Wook,Lee, Kyu Hwan,Jeong, Yongsoo,Kim, Young Dok,Lim, Dong Chan American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.3
<P>Pure and TiO2- and CdSe-deposited ZnO nanosheets aligned vertically to the surface of ITO (Indium tin oxide) are prepared using electrodeposition, which is used for building blocks of dye sensitized solar cell. A significant improvement in the photovoltaic efficiency can be obtained by depositing TiO2 or CdSe on ZnO. Photoluminescence spectra show that the TiO2 and CdSe nanostructures suppress the recombination of the electron-hole pair of ZnO. We suggest that the interface charge transfer at TiO2-ZnO and CdSe-ZnO should be responsible for the suppression of the electron-hole pair recombination and enhanced solar cell efficiency by TiO2 and CdSe nanostructures.</P>
Identification of Different Isomers of Reacted Transition Metal Clusters
Young Dok Kim,Gerd Gantefor 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.3
When gas molecules adsorb on clusters, dissociative or non-dissociative chemisorption can take place. For some cases, both takes place at the same time, leading to the formation of two different isomers. With conventional methods, it is difficult to identify various isomers. In the present work, a novel method to identify isomers of a reacted cluster is presented. Using atomic and molecular reagents, one can obtain various isomers at different concentrations, and these isomers can be identified using ultraviolet photoelectron spectroscopy. Several examples for the identification of different isomers will be presented here.gf