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정우식,Bong-Ki Min,Jeong-Hyun Park,Sang-Won Seo,Woo Sik Jung,안광순 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
Alumina particles wrapped in few-layer graphene sheets were prepared by calcining aluminum nitride powders under a mixed gas flow of carbon monoxide and argon. The graphene sheets were characterized by powder Xray diffraction (XRD), Raman spectroscopy, electron energy loss spectroscopy, and high-resolution transmission electron microscopy. The few-layer graphene sheets, which wrapped around the alumina particles, did not exhibit any diffraction peaks in the XRD patterns but did show three characteristic bands (D, G, and 2D bands) in the Raman spectra. The dye-sensitized solar cell (DSSC) with the alumina particles wrapped in fewlayer graphene sheets exhibited significantly improved overall energy-conversion efficiency, compared to conventional DSSC, due to longer electron lifetime.
Breast Reconstruction with Superior Gluteal Artery Perforator Flap in Asian
정우식,이택종,엄진섭,Jeong, Woo Shik,Lee, Taek Jong,Eom, Jin Sup The Korean Society for Microsurgery 2013 Archives of reconstructive microsurgery Vol.22 No.1
Purpose: Breast reconstruction with lower abdominal tissue can produce the best outcome with acceptable rates of long-term complication. However, for cases in which sufficient abdominal tissue is not available, an superior gluteal artery perforator (SGAP) flap can be considered as the next option for autologous breast reconstruction. Materials and Methods: Among a total of 63 women who underwent breast reconstruction with free autologous tissue transfer from July 2010 to April 2011, SGAP flap was performed for four patients. In two cases, patients did not have enough abdominal tissue for sizable breast reconstruction. In another case, the patient had a long abdominal scar due to donor hepatectomy of liver transplantation. In the last case, which was a revisional case after radiation necrosis of a previous pedicled transverse rectus abdominis musculocutaneous (TRAM) flap, a large amount of healthy skin and soft tissue was needed. SGAP flap was elevated in lateral decubitus position. The internal mammary vessels were used for recipient vessels in all cases. Results: Breast reconstruction was performed successfully in all four cases without flap loss. Donor site complication was not observed, except for one case of seroma. The shape of the reconstructed breast was satisfactory in all patients. Conclusion: SGAP flap is an excellent alternative option for the TRAM or deep inferior epigastric artery perforator flap for breast reconstruction. In terms of narrower width, harder consistency of soft tissue, and shorter pedicle, it is clear that the SGAP flap is less competent than the TRAM flap. However, in cases where abdominal tissue is not available, SGAP flap is the only way of providing a large amount of healthy tissue.
시각적 되먹임 훈련이 편마비 환자의 균형능력에 미치는 영향
정우식,김병길,김은비,신예지,양용필,황기경,이홍균,Jeong, Woo-Sik,Kim, Byung-Kil,Kim, Eun-Bi,Shin, Ye-Ji,Yang, Yong-Pil,Hwang, Ki-Kyung,Lee, Hong-Gyun 대한고유수용성신경근촉진법학회 2010 PNF and Movement Vol.8 No.2
Purpose : The purpose of present study was to determine effects of a visual feedback training on balance ability in poststroke hemiparetic subjects. Methods : Fourteen chronic stroke patients participated. Participants were randomly divided into either visual feedback training group(7 experimental group, 7 control group). All of participated were inpatients at local rehabilitation center and had been receiving a traditional rehabilitation program, five days a week. Exprimental group have additionally undergone for four weeks, three days a week, the visual feedback training but control group was not received any additional program except the traditional rehabilitation program. The Berg Balance Scale(BBS), the FICSIT-4, the MTD-balance system to measure a balance ability were carried out twice before and after training. Results : After participation in the program, subjects of visual feedback training demonstrated a significant improvement in the scores of the BBS, the FICSIT-4, the MTD-Balance system. The control group had no change on the any tests. After the training, the result to improve significantly in visual feedback training group compared to post-test of control group were the score of BBS and the FICSIT-4 and the MTD-Balance system. Conclusions : The present study suggests that the visual feedback training program may become a useful strategy for enhancing balance ability in the rehabilitation of stroke patiens.