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조규정(KyuJung Cho),강지훈(JiHoon Kang),김인수(InSoo Kim),한부전(BuJeon Han),김민국(MinKuk Kim),김광택(KwangTaek Kim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
A tunable fused fiber coupler was developed based on the thermo-optic effect of the external medium surrounding the fused taped region of the coupler. The transmission characteristics of the fused fiber coupler were strongly dependent on the refractive index of the surrounding medium due to the evanescent field interaction. A polymer with a matched refractive index and high thermo-optic coefficient was used as the external medium and its refractive index was controlled thermo-optically by a Ni-Cr coil heater. The technology was applied to a fused fiber coupler for 1310nm/1550nm wavelength division multiplexing(WDM). The good thermo-optic effects of the polymer induced by the coil heater led to a 120 nm wide tunable wavelength range with an applied electrical power of 605 mW.
Kim, Kyujung,Cho, Eun-Jin,Huh, Yong-Min,Kim, Donghyun Optical Society of America 2007 Optics letters Vol.32 No.21
<P>We investigated experimentally the evanescent field enhancement based on dielectric thin films in total internal reflection microscopy. The sample employed two layers of Al2O3 and SiO2 deposited on an SF10 glass substrate. Field intensity enhancement measured by fluorescent excitation of microbeads relative to that of a control sample without dielectric films was polarization dependent, determined as 4.2 and 2.4 for TE and TM polarizations, respectively, and was in good agreement with numerical results. The thin-film-based field enhancement was also applied to live-cell imaging of quantum dots, which confirmed the sensitivity enhancement qualitatively.</P>
Kim, Kyujung,Kim, Dong Jun,Cho, Eun-Jin,Suh, Jin-Suck,Huh, Yong-Min,Kim, Donghyun IOP Pub 2009 Nanotechnology Vol.20 No.1
<P>We investigated evanescent field enhancement based on subwavelength nanogratings for improved sensitivity in total internal reflection microscopy of live cells. The field enhancement is associated with subwavelength-grating-coupled plasmon excitation. An optimum sample employed a silver grating on a silver film and an SF10 glass substrate. Field intensity was enhanced by approximately 90% when measured by fluorescent excitation of microbeads relative to that on a bare prism as a control, which is in good agreement with numerical results. The subwavelength-grating-mediated field enhancement was also applied to live cell imaging of quantum dots, which confirmed the sensitivity enhancement qualitatively. </P>
( Hong Man Cho ),( Kyujung Lee ) 대한고관절학회 2016 Hip and Pelvis Vol.28 No.4
Purpose: We aimed to evaluate and compare the clinical and functional outcomes of dynamic hip screw (DHS) and proximal femoral nail antirotation (PFNA) treatment of AO type 1 intertrochanteric fractures in elderly patients. Materials and Methods: We retrospectively reviewed 194 consecutive patients with type A1 intertrochanteric femoral fractures who were treated with DHS (n=113) or PFNA (n=81). We evaluated operation time, intraoperative blood loss, and functional outcomes, walking ability, and the Barthel activities index. Fracture union, sliding of hip screw, proximal femur shortening, and presence of complications were assessed radiologically at relevant follow-up intervals. Results: The mean operation time and blood loss were significantly lower for the PFNA group, but walking ability and Barthel index decreased to a similar extent for both groups. However, patients in the DHS group complained of significantly more pain (P=0.049). Although there were no significant differences between the two groups with respect to the time until fracture union was achieved, patients in the DHS group exhibited a higher extent of proximal femoral shortening and sliding of the hip screw. Differences about hip screw sliding and proximal femur shortening within each subgroup were not significant. Conclusion: Compared to DHS treatment, PFNA treatment of type A1 intertrochanteric fractures is associated with reduced blood loss, shorter operation time, and less severe pain after surgery. Additionally, sliding of the hip screw and proximal femur shortening are expected to occur more frequently after DHS.