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RISS 인기검색어
- 검색키워드
- 저자 : Hwakyung Byun (검색결과 3 건)
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Preparation of PVdF/GO Nanofiber Composite Membranes and its Heavy Metal Removal Characteristics
Hwakyung Jeong(정화경),Wongi Jang(장원기),Jaehan Yun(윤재한),Hongsik Byun(변홍식) 한국고분자학회 2016 폴리머 Vol.40 No.3
본 연구에서는 전기방사법을 이용하여 PVdF/GO 나노섬유 복합분리막을 제조하고, 중금속(납, 카드뮴)이온에 대한 제거특성평가를 진행하였다. 합성된 GO 및 복합분리막은 SEM, FTIR, Raman 분석 및 tensometer를 이용하여 특성평가를 진행하였으며, 위 결과로부터 다양한 기능기를 가진 GO의 합성 및 PVdF 나노섬유 내에 복합화되어 있는 것을 확인하였다. 또한 합성된 GO의 Langmuir 및 Freundlich 흡착 등온선 연구를 실시하였다. PVdF/GO 나노섬유 복합분리막은 친수특성을 보여주고 있으며, PVdF 나노섬유 분리막 대비 최대 3배 이상의 높은 수투과도를 나타내었다. PVdF/GO20의 중금속 제거율은 시간에 따라 점차 증가하였으며, 2시간 이후 95.2% (Pb), 98.3% (Cd)에 각각 도달하는 것을 확인하였다. 위 결과로부터 제조된 PVdF/GO 나노섬유 복합분리막은 하폐수처리 시스템에 충분히 활용할 수 있을 것으로 판단된다. This paper describes the preparation of PVdF/graphene oxide (GO) nanofiber composite membranes via electrospining and their removal characteristics of heavy metal ions (e.g., lead and cadmium). The synthesized GO and composite membranes were characterized by SEM, FTIR, Raman analysis, and tensometry. These results demonstrated the successful synthesis of GO with various functional groups and their incorporation into the PVdF nanofibers. In addition, the adsorption isotherm studies of the synthesized GO using both the Langmuir and Freundlich models were carried out. The PVdF/GO nanofiber composite membranes showed hydrophilic characteristics and higher pure water flux (up to 3 times) than that of a neat PVdF nanofiber membranes. The heavy removal rate of PVdF/GO20 increased gradually as a function of time which reached at 95.2% (Pb) and 98.3% (Cd) after 2 h, respectively. From these results, prepared PVdF/GO nanofiber composite membranes have shown a great potential to be utilized for the wastewater system.
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Morphologic change of rectosigmoid colon using belly board and distended bladder protocol
Cho, Yeona,Chang, Jee Suk,Kim, Mi Sun,Lee, Jaehwan,Byun, Hwakyung,Kim, Nalee,Park, Sang Joon,Keum, Ki Chnag,Koom, Woong Sub The Korean Society for Radiation Oncology 2015 Radiation Oncology Journal Vol.33 No.2
Purpose: This study investigates morphologic change of the rectosigmoid colon using a belly board in prone position and distended bladder in patients with rectal cancer. We evaluate the possibility of excluding the proximal margin of anastomosis from the radiation field by straightening the rectosigmoid colon. Materials and Methods: Nineteen patients who received preoperative radiotherapy between 2006 and 2009 underwent simulation in a prone position (group A). These patients were compared to 19 patients treated using a belly board in prone position and a distended bladder protocol (group B). Rectosigmoid colon in the pelvic cavity was delineated on planning computed tomography (CT) images. A total dose of 45 Gy was planned for the whole pelvic field with superior margin of the sacral promontory. The volume and redundancy of rectosigmoid colon was assessed. Results: Patients in group B had straighter rectosigmoid colons than those in group A (no redundancy; group A vs. group B, 10% vs. 42%; p = 0.03). The volume of rectosigmoid colon in the radiation field was significantly larger in group A (56.7 vs. 49.1 mL; p = 0.009). In dose volume histogram analysis, the mean irradiated volume was lower in patients in group B (V45 27.2 vs. 18.2 mL; p = 0.004). In Pearson correlation coefficient analysis, the in-field volume of rectosigmoid colon was significantly correlated with the bladder volume (R = 0.86, p = 0.003). Conclusion: Use of a belly board and distended bladder protocol could contribute to exclusion of the proximal margin of anastomosis from the radiation field.
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Morphologic change of rectosigmoid colon using belly board and distended bladder protocol
Yeona Cho,MD,Jee Suk Chang,MD,Mi Sun Kim,MD,Jaehwan Lee,MD,Hwakyung Byun,MD,Nalee Kim,MD,Sang Joon Park,MD,Ki Chnag Keum,MD,Woong Sub Koom,MD 대한방사선종양학회 2015 Radiation Oncology Journal Vol.33 No.2
Purpose: This study investigates morphologic change of the rectosigmoid colon using a belly board in prone position and distended bladder in patients with rectal cancer. We evaluate the possibility of excluding the proximal margin of anastomosis from the radiation field by straightening the rectosigmoid colon. Materials and Methods: Nineteen patients who received preoperative radiotherapy between 2006 and 2009 underwent simulation in a prone position (group A). These patients were compared to 19 patients treated using a belly board in prone position and a distended bladder protocol (group B). Rectosigmoid colon in the pelvic cavity was delineated on planning computed tomography (CT) images. A total dose of 45 Gy was planned for the whole pelvic field with superior margin of the sacral promontory. The volume and redundancy of rectosigmoid colon was assessed. Results: Patients in group B had straighter rectosigmoid colons than those in group A (no redundancy; group A vs. group B, 10% vs. 42%; p = 0.03). The volume of rectosigmoid colon in the radiation field was significantly larger in group A (56.7 vs. 49.1 mL; p = 0.009). In dose volume histogram analysis, the mean irradiated volume was lower in patients in group B (V45 27.2 vs. 18.2 mL; p = 0.004). In Pearson correlation coefficient analysis, the in-field volume of rectosigmoid colon was significantly correlated with the bladder volume (R = 0.86, p = 0.003). Conclusion: Use of a belly board and distended bladder protocol could contribute to exclusion of the proximal margin of anastomosis from the radiation field.
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