Search

Your search keyword '"Shin, Jae-Hyuk"' showing total 141 results
Start Over Author "Shin, Jae-Hyuk"
141 results on '"Shin, Jae-Hyuk"'

2. Ultralow Drive Voltage Substrate Removed GaAs/AlGaAs Electro-Optic Modulators at 1550 nm

Author

Shin, Jae Hyuk and Dagli, Nadir

Subjects
Optical modulation, compound semiconductors, optical waveguides, phase modulation, Optical Physics, Quantum Physics, Electrical and Electronic Engineering, Optoelectronics & Photonics
Abstract

This study reports ultralow drive voltage Mach-Zehnder modulators in highly confined substrate removed GaAs/AlGaAs optical guides with buried doped QW electrodes. Separation between the doped QW electrodes, which is the electrode gap, is only 0.15 μm. Such a small electrode gap results in very high electric fields overlapping very well with the optical mode. A careful analysis of the physical effects contributing to index change is presented and techniques to use these index changes efficiently are described. Fabrication details are given. Results of careful characterization of phase and Mach-Zehnder intensity modulators are presented. Variation of propagation loss and extinction ratio with applied voltage are investigated. Intensity modulators with 7-mm-long electrodes have 0.3 Vπ under push-pull operation with 15 dB extinction ratio. This corresponds to a 0.21 V·cm modulation efficiency in bulk compound semiconductors. © 2013 IEEE.

Published
2013

4. Lumbar Interbody Fusion and Osteobiologics for Lumbar Fusion

Author

Kim, Young-Hoon, primary, Ha, Kee-Yong, additional, Kim, Youn-Soo, additional, Kim, Ki-Won, additional, Rhyu, Kee-Won, additional, Park, Jong-Beom, additional, Shin, Jae-Hyuk, additional, Kim, Young-Yul, additional, Lee, Jun-Seok, additional, Park, Hyung-Youl, additional, Ko, Jaeryong, additional, and Kim, Sang-Il, additional

Published
2022
Full Text
View/download PDF

9. Cortical Bone Trajectory Pedicle Screw Fixation in Surgical Treatment of Monosegmental Pyogenic Lumbar Spondylodiskitis.

Author

Shin, Jae-Hyuk, Kim, Sang-II, Jung, Jiyoung, and Rhyu, Kee-Won

Subjects
*BONE grafting, *COMPACT bone, *SPINE diseases, *SCREWS, *VISUAL analog scale, *C-reactive protein
Abstract

Background and Study Object Pedicle screw fixation has been widely used in surgical treatment for infective lumbar spondylodiskitis to prevent instability and deformity. The cortical bone trajectory pedicle screw (CBTPS) fixation is a minimally invasive posterior spinal fixation system that runs from the pedicle's entry point of the caudiomedial region toward the cephalad-divergent direction. Successful results with CBTPS fixation have been reported to treat degenerative and osteoporotic spinal diseases. This study aims to investigate the clinical feasibility of CBTPS in the surgical treatment of pyogenic lumbar spondylodiskitis. Patient and Methods We retrospectively retrieved 20 consecutive patients from two academic centers who were surgically treated for monosegmental lumbar pyogenic spondylodiskitis. The primary surgical treatment was the anterior lumbar interbody fusion with decompression, debridement, and reconstruction using an autogenous iliac strut bone graft. One to 2 weeks after the primary surgery, patients underwent a second surgery for posterior instrumentation using conventional pedicle screws (CPS; group I) and CBTPS (group II). Radiographic parameters of the deformity angle at the fusion segment and clinical parameter of visual analog scale (VAS) scores were assessed preoperatively, postoperatively, and at the last follow-up. Results There were 10 patients in each group. The mean follow-up periods of groups I and II were 51.10 ± 6.95 and 28.60 ± 9.31 months, respectively. Intergroup analysis indicated the two groups area age-matched (p = 0.38), but initial C-reactive protein (CRP; mg/dL, p = 0.04), CRP normalization (months, p = 0.00), and follow-up duration (months, p = 0.00) were heterogeneous. Meanwhile, deformity angles (segmental lordosis) between the two groups were not significantly different preoperatively (p = 0.25), postoperatively (p = 0.13), and at last follow-up (p = 0.38). The intragroup analysis indicated a significant postoperative increase of lordosis in both group I and II (p = 0.00 and 0.04, respectively) with subsequent subsidence. Lordosis remained increased at the last follow-up with or without significance (group I, p = 0.02; group II, p = 0.62). Both groups showed significant improvement in VAS scores (group I, p = 0.00; group II, p = 0.00). Conclusion In monosegmental lumbar spondylodiskitis, posterior stabilization of the anterior strut bone graft by CBTPS and CPS was comparable via the radiographic parameter of segmental lordosis or deformity angle. Our observation suggests the clinical feasibility of CBTPS in the treatment of relatively mild monosegmental pyogenic lumbar spondylodiskitis. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

38. Heterogeneously integrated lasers on silicon

Author

Koch, Brian R., additional, Norberg, Erik J., additional, Roth, Jonathan E., additional, Kim, Byungchae, additional, Ramaswamy, Anand, additional, Guzzon, Robert S., additional, Hutchinson, John, additional, Shin, Jae-Hyuk, additional, Imamura, Jeffrey, additional, Gomez, Brandon, additional, Fish, Gregory, additional, and Fang, Alexander, additional

Published
2014
Full Text
View/download PDF

40. Heterogeneous Integration on Silicon

Author

Fang, Alexander, primary, Koch, Brian R., additional, Norberg, Erik J., additional, Roth, Jonathon, additional, Kim, Byungchae, additional, Ramaswamy, Anand, additional, Hutchinson, John, additional, Shin, Jae-Hyuk, additional, and Fish, Gregory, additional

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results