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Lifetime enhancement of high-power light-emitting diodes using thermal paths in ceramic package
Ma, B.,Kim, J. IET 2012 Electronics letters Vol.48 No.3
<P>By inserting the Ag thermal paths located under the GaN-based light-emitting diode (LED) chip in a low-temperature co-fired ceramic package, junction-to-atmosphere thermal resistance could be reduced from 53 to 13 K/W. Temperature-stress accelerated life tests were carried out to check the effect of thermal improvement on reliability and to estimate lifetime as a function of junction temperature. After a 4000-hour test, the lifetimes of the degraded LED packages were estimated. The mean time to failure (MTTF) was below 20 000 hours at 35 C atmosphere temperature for the conventional LEDs. On the other hand, the estimated MTTF was over 50 000 at the same atmosphere temperature for the improved LEDs.</P>
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Distal Radius Fractures Using Acu-Loc Volar Plate
Kheng Mab,김병성,김응하,임수재,민경대,이영구,이상혁 순천향대학교 순천향의학연구소 2011 Journal of Soonchunhyang Medical Science Vol.17 No.1
Objectives: We determined the radiographic outcome of distal radius fractures with Acu-Loc® volar plate. Methods: Forty-one patients were recruited between August 2009 and September 2010. There were 10 males and 31 females, with a mean age 61.2. Fractures were radiologically classification the Frykman. Fifteen fractures were group 8, eight were group 7, ten were group 6, four were group 5 and four were group 3. Distal part of the fractures was dorsally inclined in 37 wrists and inclined to volar side in four wrists. Lateral and anteroposterior radiographs taken after operated day, the fracture were compared with radiographs of the injured wrist and the differences in palmar tilt, ulnar variance; radial height; radial shift and radial inclination were measured. Results: There was significant improvement in the measurements of radial height, radial inclination, volar tilt, ulnar variance and radial shift postoperatively. The radial height improved from an average of 8.5 mm (3-15mm) to 11.0 mm (8-15mm), the radial inclination improved from an average of 21.5 deg. (10-40deg.) to 28.1 deg. (19-44deg.), the palma tilt improved from an average of 12.9 deg. (6-22deg.) to 17.2 deg. (7-27deg.), the ulnar variance improved from an average of -2.3 mm (-6-4mm) to 1mm (-3-7mm) and the radial shift improved from an average of 18.7 mm (15-26mm) to 17.3 mm (12-21mm). Conclusion: Acu-Loc® volar plate is a safe and effective
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MA Alam,MAB Nyeem,MA Awal,M Mostofa,MS Alam,N Subhan,M MostafizurRahman 경희대학교 융합한의과학연구소 2008 Oriental Pharmacy and Experimental Medicine Vol.8 No.2
The hepatoprotective activity of the alcoholic extract of Rosa damascena was studied against paracetamol induced acute hepatotoxicity in rats. Liver damage was assessed by estimating serum enzyme activities of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase and histopathology of liver tissue. Pre- and post-treatment with ethanolic extracts showed a dose-dependent reduction of paracetamol induced elevated serum levels of enzyme activity. The mechanism underlying the protective effects was assayed in vitro and the R. damascena extracts displayed dosedependent free radical activity using DPPH (IC50 = 162.525 μg/ml) and TBA method. The hepatoprotective action was confirmed by histopathological observation. The ethanolic extracts reversed paracetamol induced liver injury. These results suggest that the hepatoprotective effects of R. damascena extracts are related to its antioxidative activity. The hepatoprotective activity of the alcoholic extract of Rosa damascena was studied against paracetamol induced acute hepatotoxicity in rats. Liver damage was assessed by estimating serum enzyme activities of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase and histopathology of liver tissue. Pre- and post-treatment with ethanolic extracts showed a dose-dependent reduction of paracetamol induced elevated serum levels of enzyme activity. The mechanism underlying the protective effects was assayed in vitro and the R. damascena extracts displayed dosedependent free radical activity using DPPH (IC50 = 162.525 μg/ml) and TBA method. The hepatoprotective action was confirmed by histopathological observation. The ethanolic extracts reversed paracetamol induced liver injury. These results suggest that the hepatoprotective effects of R. damascena extracts are related to its antioxidative activity.
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Alam, MA,Nyeem, MAB,Awal, MA,Mostofa, M,Alam, MS,Subhan, N,Rahman, M Mostafizur Kyung Hee Oriental Medicine Research Center 2008 Oriental pharmacy and experimental medicine Vol.8 No.2
The hepatoprotective activity of the alcoholic extract of Rosa damascena was studied against paracetamol induced acute hepatotoxicity in rats. Liver damage was assessed by estimating serum enzyme activities of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase and histopathology of liver tissue. Pre- and post-treatment with ethanolic extracts showed a dose-dependent reduction of paracetamol induced elevated serum levels of enzyme activity. The mechanism underlying the protective effects was assayed in vitro and the R. damascena extracts displayed dosedependent free radical activity using DPPH ($IC_{50}=162.525\;{\mu}g/ml$) and TBA method. The hepatoprotective action was confirmed by histopathological observation. The ethanolic extracts reversed paracetamol induced liver injury. These results suggest that the hepatoprotective effects of R. damascena extracts are related to its antioxidative activity.
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