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이훈주,Yang Weiguang,신현석 대한화학회 2024 Bulletin of the Korean Chemical Society Vol.45 No.3
Atomically thick two‐dimensional transition metal dichalcogenides (TMDs) have been extensively studied as optoelectronic materials because of their distinctive electronic structures and outstanding photonic and catalytic properties. In particular, when the size of TMDs are decreased to the quantum scale, they possess wider bandgaps and higher surface‐to‐volume ratios with more active edge sites per unit mass. Hence, they are promising for use in sensor, battery, and electrocatalytic applications. In this study, we briefly review the various popular synthesis methods of TMD quantum dots (QDs) from top‐down and bottom‐up approaches. Then, we summarize the optical, electronic, and catalytic properties of TMD QDs. Furthermore, recent progress on electrochemistry, energy storage, and solar cell applications of TMD QDs is summarized in detail. Finally, we summarize current research bottlenecks of TMD QDs and discuss potential avenues for future research. Atomically thick two-dimensional transition metal dichalcogenides (TMDs) have been extensively studied as optoelectronic materials because of their distinctive electronic structures and outstanding photonic and catalytic properties. In particular, when the size of TMDs are decreased to the quantum scale, they possess wider bandgaps and higher surface-to-volume ratios with more active edge sites per unit mass. Hence, they are promising for use in sensor, battery, and electrocatalytic applications. In this study, we briefly review the various popular synthesis methods of TMD quantum dots (QDs) from top-down and bottom-up approaches. Then, we summarize the optical, electronic, and catalytic properties of TMD QDs. Furthermore, recent progress on electrochemistry, energy storage, and solar cell applications of TMD QDs is summarized in detail. Finally, we summarize current research bottlenecks of TMD QDs and discuss potential avenues for future research.
흰쥐에 시행한 무세포 인체 진피 이식에서의 Basic Fibroblast Growth Factor의 효과
이훈주,김양우,전영우 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.5
Purpose: Acellular human dermis is very useful implant for use in plastic and reconstructive surgery. However, the volume of acellular human dermis graft is known to decrease for a long time. Basic fibroblast growth factor (bFGF) is a polypeptide that enhances the collagen synthesis and angiogenesis. In the current study we examined whether bFGF could improve the survival of acellular human dermis (SureDerm^Ⓡ) by increasing angiogenesis of the graft. Methods: Forty rats were divided into two groups (control and bFGF). A 2-mm thick piece of SureDerm^Ⓡ was cut into smaller pieces that were 15 × 5 mm in size. Two subcutaneous pockets were made on the back of each rat. Grafts sprayed with bFGF were implanted in the bFGF group and injected with bFGF after transplantation every 3 days for 2 weeks. In the control group, the grafts were treated with phosphate-buffered saline (PBS) instead of bFGF. Four days, and 1, 4, and 12 weeks after the implantation, the grafts were harvested and gross and histologic examinations were performed. Inflammation grade, graft thickness, neocollagen density, and neocapillary count were measured. Results: The bFGF group displayed more rapid accumulation of inflammatory cells with a higher density of neocapillaries, and increased active collagen synthesis. After 12 weeks, the thickness of the grafts in the control and bFGF groups was 75.15 ± 4.80% and 81.79 ± 5.72%, respectively, in comparison to the thickness before transplantation. There was a statistically significant difference between both groups (p<0.05). Conclusion: bFGF was effective in reducing the absorption of acellular human dermal grafts by increasing angiogenesis and accelerating engraftment. In conclusion, bFGF may be a good tool for use in acellular human dermal graft transplantation for reconstructive surgery involving soft-tissue defects.
MRSA에 감염된 흰쥐의 MRSA 전층피부결손에 대한 은 함유 하이드로화이버 드레싱과 소수성 드레싱의 효과의 비교
이훈주,강소라,김양우 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.4
Purpose: Aquacel Ag^® is a hydrofiber wound dressing integrated with ionic silver. Sorbact^® is a hydrophobiccoated dressing that uses the hydrophobic interaction with microbes. In this study, we compared the wound healing effects and the antibacterial effects of Medifoam^® , Betadine soaked, Aquacel Ag and Sorbact dressings against MRSA-infected wounds. Methods: Eighty rats were divided into four groups: Medifoam ; Betadine soaked; Aquacel Ag^® ; and Sorbact^® . A 1.5 × 1.5 cm square full-thickness wound was made on the dorsum of each rat and infected with MRSA. Twentyfour hours thereafter, each dressing was applied to the wound and changed every other day. One, 3, 7, 11 and 15 days after the wound infection, swab culture grade, wound bed appearance score, and wound defect size change were evaluated, and 7 and 15 days after, histologic evaluation was compared between the groups. Results: The bacteria load of wounds in the Sorbact^® group decreased earlier than in the other groups. The wound bed appearance score of the Sorbact^®group also increased quicker, compared with the other groups. However,the size of wounds of the Aquacel Ag^® group decreased more rapidly, compared with other groups. From the histologic point of view, there was no significant difference between Betadine soaked, Aquacel Ag^® and Sorbact^®groups. Conclusion: The hydrophobic dressing using Sorbact^® showed a more rapid reduction in the MRSA load and an elevation in the wound bed appearance score, but a slower decrease in wound size change due to detachment of wound bed tissue when the dressing was eliminated in the low exudate wound. The silver-containing hydrofiber dressing using Aquacel Ag^® was more effective in ultimate wound size reduction, but some debris was trapped in the wound tissue and induced foreign body reaction in the high exudate wound. Thus, ongoing selection process of treatment based on the evaluation of the infectious wound state will be very important.
이훈주,김재연,서승오 대한소화기학회 2023 대한소화기학회지 Vol.81 No.3
Acute epiploic appendagitis is an uncommon cause of abdominal pain resulting from appendageal ischemia caused by torsion or thrombosis of the draining vein. It is frequently misdiagnosed as acute appendicitis or diverticulitis. The coronavirus disease 2019 (COVID-19) pandemic has changed how this rare disease is diagnosed. There was a report of a young men diagnosed with COVID-19 and epiploic appendagitis as a rare cause of abdominal pain. In addition, a 50-year-old men was diagnosed with epiploic appendagitis during the treatment of COVID-19. This paper reports the case of a 53-year-old men who presented with right lower quadrant abdominal pain after COVID-19 and was diagnosed with acute epiploic appendagitis by computed tomography image findings. The thrombotic condition of COVID-19 may contribute to acute appendagitis, but more studies are needed to confirm this hypothesis.
모아레法 을 活용 比較한 오우스테나이트系 SUS 27 의 크리이프擧動
옹장우,이훈주 대한기계학회 1983 대한기계학회논문집 Vol.7 No.1
This study practiced to observe the creep behavior at specific temperature on Austentic SUB 27 stainless steel by Moire method. The results obtained from this study are summarized as follows; In tensile experiment, tensile strength and yielding strength decrease as the temperature increases. Yielding strength is equivalent to 60-70% of tensile strength. Reduction of Area and Elongation show minimum values at 300.deg. C. The results of Moire method using Moire heating resisting grid coincide with LVDT result. Therefor, It is proved that the Moire method has great merit in strain measurement of a creep behavior. In homologous at temp. 0.2 or less, creep behavior is very small amount. But, in more than 0.3, creep behavior is very active. Creep rate increase as temperature increase and creep rate is proportional to .alpha. values of experimental equation.