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Jae-Hak Choi,Sung-Jin Gwon,Joon-Yong Shon,Chan-Hee Jung,Young-Eon Ihm,Youn-Mook Lim,Young-Chang Nho 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.1
Polystyrene-grafted poly(vinylidene fluoride) (PVDF-g-PS) membranes were prepared by simultaneous g-irradiation-induced graft polymerization. The morphological changes of the prepared membranes were investigated by scanning electron microscopy. The degree of grafting (DOG) increased with increasing absorption doses. The degree of crystallinity upon grafting was found to decrease due to the formation of amorphous polystyrene layer. The grafted membranes showed better electrolyte uptake and retention ability compared to the ungrafted membrane. The ionic conductivity of the membrane with LiClO4/g-butyrolactone-based electrolyte increased with the increase in the DOG and reached 2.50 mS/cm for the highest sample. # 2007 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Gwon, Jae-Sung,Chun, Myung-Hoon,Kang, Wha-Sun The Korean Society for Integrative Biology 2011 Animal cells and systems Vol.15 No.2
Doublecortin (DCX) is microtubule-associated protein and is required for neuronal migration, differentiation and plasticity. In the retina, it is highly expressed between embryonic day 18 (E18) and E20, and is poorly expressed postnatally. In this study, we investigated the expression and cellular localization of DCX in the rat retina following ischemia induced by transiently increasing the intraocular pressure. While DCX immunoreactivity in control retinas was restricted to the outer border of the inner nuclear layer, it appeared in horizontal cell somata and processes in affected retinas. Quantitative evaluation by immunoblotting confirmed that DCX expression continuously increased after ischemia-reperfusion and showed 370% of control protein levels at 4 weeks after ischemic insult. These results suggest that the DCX in horizontal cells might play a role in neurite remodeling or modulating other neurons in ischemic rat retinas.
Case Reports : Malignant Gastrointestinal Stromal Tumor in a Patient with Neurofibromatosis type 1
Sang Hoon Han,Se Hoon Park,Gwon Hyun Cho,Na Rae Kim,Jae Hwan Oh,Eun Mi Nam,Dong Bok Shin 대한내과학회 2007 The Korean Journal of Internal Medicine Vol.22 No.1
Neurofibromatosis type 1 (von Recklinghausen`s disease, NF-1) is an autosomal-dominant neurocutaneous disorder characterized by abnormal skin pigmentation (cafe au lait spots and axillary freckling), cutaneous and plexiform neurofibromas, skeletal dysplasias, and Lisch nodules (pigmented iris hamartomas). Gastrointestinal stromal tumors (GISTs) are the most common tumors of mesenchymal origin in the gastrointestinal tract, mesentery, omentum, and retroperitoneum. Here, we report a case of GIST in the ileum of a 76-year-old woman previously diagnosed as NF-1. She was admitted due to sudden onset of abdominal pain. Contrast enhanced CT scan revealed a moderately defined, peripherally enhanced soft tissue mass of about 8.8×7.3cm, originating from the small bowel in the left of the abdomen. Surgical excision was performed and the tumor was found to be composed of tumor cells that were positive for c-kit protein. The patient started imatinib treatment a month later, but stopped medication due to dyspepsia after a few months and eventually progressed after 18 months.
Jae Sung Shin,Ki-Hee Song,Gwon Lim,Seong Y. Oh 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Laser cutting has many advantages, including high-speed cutting potential, no reaction forces, narrow kerf widths, ease of remote control, and more. This makes it the next generation cutting technology for nuclear decommissioning. For this reason, various groups in countries with nuclear power plants have been working on applying laser cutting to nuclear decommissioning. Our group has also been developing in-air and underwater laser cutting technologies. Previous research has focused on efficiently cutting thicker steels. To accomplish this, a cutting head with a long focusing element with a focal length of 600 mm was utilized. A long focusing head is advantageous for cutting thick objects at high speeds because it can maintain a high power density over a long distance. However, with such a long focused beam, the residual laser power that remains after passing through the target object can cut or damage other unwanted objects located behind the target. Utilizing a short focused element can solve this problem, but if the focal length is too short, the cutting capability will be reduced. In this work, we developed and applied a cutting head that utilizes a focused element with a short focal length of 300 mm. Cutting tests with this head allowed us to cut 10-60 mm thick stainless steel plates at a laser power of 6 kW. We also obtained the maximum cutting speed and kerf width for each thickness while increasing the laser power by 1 kW from 1 to 6 kW. The results obtained in this work are expected to be utilized for safe cutting in future nuclear decommissioning applications.