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- Publications
- Influence
High Performance MOCVD-Grown ZnO Thin-Film Transistor with a Thin MgZnO Layer at Channel/Gate Insulator Interface
- K. Remashan, Yong-seok Choi, S. Park, J. Jang
- Materials Science
- 1 December 2010
ZnO thin-film transistors TFTs with and without a thin MgZnO layer at the channel/gate insulator interface were fabricated using glass substrates. Both ZnO and MgZnO films were grown by metal organic… Expand
Holographic analysis of three-dimensional inertial migration of spherical particles in micro-scale pipe flow
- Yong-seok Choi, S. Lee
- Materials Science
- 26 March 2010
The inertial migration of neutrally buoyant spherical particles suspended in a micro-scale pipe flow was investigated in a Reynolds number range of 1.6 ≤ Re ≤ 77.4. A microtube, 350 μm in diameter,… Expand
GaN blue photonic crystal membrane nanocavities
- Yong-seok Choi, K. Hennessy, +6 authors C. Meier
- Physics
- 5 December 2005
GaN-based photonic-crystal membrane nanocavities with Q factors up to 800 have been realized at the wavelength of ∼480nm. The tuning behavior agrees well with numerical calculations using the… Expand
Growth of embedded photonic crystals for GaN-based optoelectronic devices
- E. Matioli, S. Keller, +4 authors C. Weisbuch
- Physics
- 24 July 2009
We present three different techniques to fabricate embedded photonic crystals in GaN-based structures by metal organic chemical vapor deposition, geared toward high efficiency and high directionality… Expand
Sapphire substrate-transferred nitride-based light-emitting diode fabricated by sapphire wet etching technique
- Yong-seok Choi, S. Kim
- Materials Science
- 1 September 2006
In order to investigate the influence of a sapphire substrate on the GaN-based light-emitting diode (LED) performance, sapphire-etched vertical-electrode nitride-based semiconductor (SEVENS) LEDs are… Expand
Recent Advances in ZnO-Based Light-Emitting Diodes
- Yong-seok Choi, Jang-Won Kang, Dae-Kue Hwang, S. Park
- Materials Science
- IEEE Transactions on Electron Devices
- 2010
ZnO has attracted considerable attention for optical device applications because of several potential advantages over GaN, such as commercial availability of bulk single crystals and a larger exciton… Expand
Two-dimensional photonic crystal hexagonal waveguide ring laser
Hexagonal ring-type resonators defined by two-dimensional photonic crystal waveguides are proposed and demonstrated. Lasing actions are observed from the photonic crystal ring resonator patterned on… Expand
Observation of whispering gallery modes in nanocrystalline diamond microdisks
- C. Wang, Yong-seok Choi, J. Lee, E. Hu, J. Yang, J. E. Butler
- Physics
- 23 February 2007
Nanocrystalline diamond microdisks have been fabricated and characterized. The process conditions were chosen to ensure smooth and vertical sidewalls. Focused ion beam milling was used to create… Expand
Enhanced optical power and low forward voltage of GaN-based light-emitting diodes with Ga-doped ZnO transparent conducting layer
- Taeyoung Park, Yong-seok Choi, +5 authors Y. C. Kim
- Physics
- 5 February 2010
Ga-doped ZnO (ZnO:Ga) films were grown by metalorganic chemical vapor deposition as transparent conducting layers for GaN light-emitting diodes (LEDs). The forward voltage of LEDs with ZnO:Ga was 3.3… Expand
Autopilot design for agile missile with aerodynamic fin and side thruster
- Yong-seok Choi, H. Lee, J. Choi
- Engineering
- SICE Annual Conference (IEEE Cat. No.03TH8734)
- 1 October 2003
This paper is concerned with a mixed control with aerodynamic fin and side thrusters applied to an agile missile using dynamic inversion and the Extended-Mean Assignment (EMA) control technique. The… Expand