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Cho, Chu-Young,Lee, Jin-Bock,Lee, Sang-Jun,Han, Sang-Heon,Park, Tae-Young,Won Kim, Je,Kim, Yong Chun,Park, Seong-Ju The Optical Society 2010 Optics express Vol.18 No.2
<P>We report on the improvement of light output power of InGaN/GaN blue light-emitting diodes (LEDs) by lateral epitaxial overgrowth (LEO) of GaN using a pyramidal-shaped SiO(2) mask. The light output power was increased by 80% at 20 mA of injection current compared with that of conventional LEDs without LEO structures. This improvement is attributed to an increased internal quantum efficiency by a significant reduction in threading dislocation and by an enhancement of light extraction efficiency by pyramidal-shaped SiO(2) LEO mask.</P>
Effect of Fe Doping on Ferroelectric and Ferromagnetic Properties of Sr0.5Ba0.5Nb2-xFexO6 Ceramics
Sung Yong Cho,Jin Soo Kim,M. S. Jang,Sang-Bock Cho 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Tungsten bronze structured Sr0.5Ba0.5Nb2.xFexO6 (SBNF) ceramics are prepared by a solidstate reaction method, and their dielectric constant and ferroelectric and ferromagnetic hysteresis loops are measured in the composition range from x = 0 to x = 0.2. The presence of single phases of SBNF ceramics is confirmed by X-ray diffraction. The phase transition temperature of SBNF ceramics shifts toward low temperature with an increase in Fe concentration. Particularly, the SBNF ceramics with low Fe doping exhibit a ferroelectric P-E and a ferromagnetic M-H hysteresis loops. The effect of Fe doping on the dielectric, ferroelectric, and ferromagnetic properties of Sr0.5Ba0.5Nb2.xFexO6 ceramics is investigated.l
Cho, Min Soo,Kim, Sung Hoon,Park, Seung Woo,Lim, Jin Hong,Choi, Gi Hong,Park, Joon Seong,Chung, Jae Bock,Kim, Kyung Sik Quality Medical Pub 2012 Journal of gastrointestinal surgery Vol.16 No.9
<P>The surgical resection of hilar cholangiocarcinoma is extremely challenging because the tumor is closely related with the complicated hilar structures. We investigated to identify the outcomes for patients who underwent surgical resection and to identify the parameters that influenced radical resection.</P>