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Okmin Park,TaeWan Kim,Minsu Heo,Sang Jeong Park,Se Woong Lee,Hyun Kyu Cho,Sang-il Kim 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.3
Bi2Te3-based alloys have been extensively studied as thermoelectric materials near roomtemperature. In this study, the electrical, thermal, and thermoelectric transport properties of a series of Codopedn-type Cu0.008Bi2Te2.6Se0.4 polycrystalline alloys (Cu0.008Bi2−xCoxTe2.6Se0.4, x = 0, 0.03, 0.06, 0.09 and 0.12)are investigated. The electrical conductivity of the Cu0.008Bi1.97Co0.03Te2.6Se0.4 (x = 0.03) sample wassignificantly enhanced, by 34%, to 1199 S/cm compared to 793 S/cm of the pristine Cu0.008Bi2Te2.6Se0.4 (x = 0)sample at 300 K, and gradually decreased to 906 S/cm for x = 0.12 upon further doping. Power factors of theCo-doped samples decreased compared to the 3.26 mW/mK2 of the pristine Cu0.008Bi2Te2.6Se0.4 sample at 300K. Meanwhile, the power factor of the Cu0.008Bi1.97Co0.03Te2.6Se0.4 (x = 0.03) sample became higher at 520 K. The lattice thermal conductivities of the Co-doped samples decreased due to additional point defect phononscattering by the Co dopant. Consequently, the zT for the Cu0.008Bi1.97Co0.03Te2.6Se0.4 alloy at 520 K was 0.83,which is approximately 15% larger than that of pristine Cu0.008Bi2Te2.6Se0.4, while the zT of the Cu dopedsamples at 300 K was smaller than that of the pristine Cu0.008Bi2Te2.6Se0.4 sample. Electrical transportproperties of the Co-doped Cu0.008Bi2−xCoxTe2.6Se0.4 samples were analyzed by experimental phenomenologicalparameters, including the density-of-state, effective mass, weighted mobility, and quality factor.
Extraforaminal Extrusion of Intervertebral Disc Misdiagnosed as Neurogenic Tumor: a Case Report
Chun, Se-Woong,Park, Young-Seop,Heo, Won,Baek, Kyeonghee,Moon, Jin Il Korean Society of Magnetic Resonance in Medicine 2017 Investigative Magnetic Resonance Imaging Vol.21 No.2
A 55-year-old male presented with dysesthesia of the right anteromedial thigh. A magnetic resonance image revealed a globular mass at the right extraforaminal area of the L3/4 level. Based on the diagnosis of neurogenic tumor, surgical excision was performed. The surgical impression and pathology confirmed extrusion of intervertebral disc. In a retrospective review of the magnetic resonance image, we noticed a fibrillary pattern directed from the intervertebral disc space to the lesion, and disrupted annulus fibrosus and indentation caused by the ring apophysis. We suggest aforementioned features, indicative of intervertebral disc lesions, to be checked when interpreting mass lesions around the intervertebral foramen.
Exposure to China dust exacerbates testicular toxicity induced by cyclophosphamide in mice
Kim Woong-Il,Lim Je-Oh,Pak So-Won,Lee Se-Jin,Shin In-Sik,Moon Changjong,Heo Jeong-Doo,Kim Jong-Choon 한국독성학회 2023 Toxicological Research Vol.39 No.1
This study investigated the potential effects of China dust (CD) exposure on cyclophosphamide (CP)-induced testicular toxicity in mice, focusing on spermatogenesis and oxidative damage. CP treatment reduced testicular and epididymal weight and sperm motility and enhanced sperm abnormality. Histopathological examination presented various morphological alterations in the testis, including increased exfoliation of spermatogenic cells, degeneration of early spermatogenic cells, vacuolation of Sertoli cells, a decreased number of spermatogonia/spermatocytes/spermatids, along with a high number of apoptotic cells. In addition, the testis exhibited reduced glutathione (GSH) levels and glutathione reductase (GR) activity and enhanced malondialdehyde (MDA) concentration. Meanwhile, CD exposure exacerbated testicular histopathological alterations induced by CP. CD exposure also aggravated oxidative damage by increasing the lipid peroxidative product MDA and decreasing GSH levels and antioxidant enzyme activities in the testis. These results suggest that CD exposure exacerbates CP-induced testicular toxicity in mice, which might be attributed to the induction of lipid peroxidation and reduced antioxidant activity.
Lee, Sang Jin,Heo, Dong Nyoung,Moon, Ji-Hoi,Park, Ha Na,Ko, Wan-Kyu,Bae, Min Soo,Lee, Jung Bok,Park, Se Woong,Kim, Eun-Cheol,Lee, Chang Hoon,Jung, Bock-Young,Kwon, Il Keun American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.10
<P>Electrospun chitosan (CTS) nanofibers have been well known for use as a wound dressing in the biomedical field. Nevertheless, fatal bacterial infections are still a serious problem when CTS nanofibers are used for wound treatment. In this study, we designed a novel wound dressing based on blending the chitosan with polyurethane (CTS/PU) containing silver sulfadiazine (AgSD) in order to enhance both antibacterial activity and mechanical strength. This fiber sheet was produced using the electrospinning (ELSP) technique. The CTS/PU containing AgSD fiber sheet was characterized by energy-dispersive X-ray spectroscopy (EDX). The physicochemical properties of the CTS/PU/AgSD fiber sheets were also characterized by thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR). The electrospun fibers were morphologically characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For an in vitro evaluation, the CTS/PU/AgSD fiber sheets were tested for their antibacterial activity against gram-negative Pseudomonas aeruginosa (P. aeruginosa), gram-positive Staphylococcus aureus (S. aureus) and Methicillin-resistant Staphylococcus aureus (MRSA). The results indicate that CTS/PU/AgSD fiber sheets have strong antimicrobial activity as displayed by inhibition of bacterial growth and prevention of infection during the healing process. These results indicate that this material would be good for use as a wound dressing material.</P>
Kim, Jin-Hyuk,Heo, Man-Woong,Cha, Kyung-Hun,Kim, Kwang-Yong,Tac, Se-Wyan,Cho, Yong,Hwang, Jae-Chun,Collins, Maria Korean Society for Fluid machinery 2012 International journal of fluid machinery and syste Vol.5 No.4
A numerical study to investigate the effect of intake vortex occurrence on the performance of an axial hydraulic turbine for generating tidal power energy in Sihwa-lake tidal power plant, Korea, is performed. Numerical analysis of the flow through an sxial hydraulic turbine is carried out by solving three-dimensional Reynolds-averaged Navier-Stokes dquations with the shear stress transport turbulence model. In the real turbine operation, the vortex flows are occurred in both the side corners around the intake of an axial hydraulic turbine due to the interaction between the inflow angle of water and intake structure. To analyze these vortex phenomena and to evaluate their impacts on the turbine performance, the internal flow fields of the axial hydraulic turbines with the different inflow angles are compared with their performances. As the results of numerical analysis, the vortex flows do not directly affect the turbine performance.
Lee, Sang Jin,Heo, Dong Nyoung,Lee, Hak Rae,Lee, Donghyun,Yu, Seung Jung,Park, Su A,Ko, Wan-Kyu,Park, Se Woong,Im, Sung Gap,Moon, Ji-Hoi,Kwon, Il Keun The Royal Society of Chemistry 2015 Journal of materials chemistry. B, Materials for b Vol.3 No.26
<P>In the last decade, titanium has been effectively used in the dental field for oral surgery as an implant material. However, disinfected Ti can be easily re-infected by the surrounding environment. Thus, a novel anti-fouling treatment for Ti implants is currently necessary. In this study, we designed an anti-fouling surface comprised of poly<I>N</I>-isopropylacylamide (PIPAAM) grafted Ti by introducing poly glycidyl methacrylate (pGMA) coating<I>via</I>an initiated chemical vapor deposition (iCVD) system to prevent bacterial infection. The results indicate that pristine Ti was well coated with pGMA with a film thickness of approximately 60 nm and uniformly grafted with PIPAAM. The bacteria were effectively detached after rinsing with a buffer solution at room temperature, while hADSCs were well attached on the surface treated Ti surface at oral temperature. All tests clearly confirm that our strategy may be a useful means of imparting anti-fouling characteristics to Ti in order to prevent bacterial adhesion and resultant peri-implantitis.</P>
이흥수 ( Heung Soo Lee ),정세웅 ( Se Woong Chung ),최정규 ( Jung Kyu Choi ),오동근 ( Dong Geun Oh ),허태영 ( Tae Young Heo ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.5
The uses of multi-dimensional hydrodynamic and water quality models are increasing to support a sustainable management of large dam reservoirs in Korea. Any modeling study requires selection of a proper spatial dimension of the model based on the characteristics of spatial variability of concerned simulation variables. For example, a laterally averaged two-dimensional (2D) model, which has been widely used in many large dam reservoirs in Korea, assumes that the lateral variations of hydrodynamic and water quality variables are negligible. However, there has been limited studies to give a justification of the assumption. The objectives of this study were to present the characteristics of spatial variations of water quality variables through intensive field monitoring in Daechung Reservoir, and provide information on a proper spatial dimension for different water quality parameters. The monitoring results showed that the lateral variations of water temperature are marginal, but those of DO, pH, and conductivity could be significant depending on the hydrological conditions and local algal biomass. In particular, the phytoplankton (Chl-a) and nutrient concentrations showed a significant lateral variation at R2 (Daejeongri) during low flow periods in 2008 possibly because of slow lateral mixing of tributary inflow from So-oak Stream and wind driven patchiness.