John M. Hong

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In this talk we characterize the transonic stationary solutions of the hydrody-namic escape problem (HEP), which is significant on studying the evolution of atmospheres of planets. The characterization is established by the geometric singular perturbation method (GSP) on the wind solution of HEP. We will discuss the existence and non-existence of the(More)
In this work we consider the linear stability of a sub-to-super invis-cid transonic stationary wave of a one-dimensional model of isentropic compressible flows through a nozzle of varying area. This sub-to-super inviscid transonic stationary wave is newly founded by the authors using the geometric singular perturbation theory. The main result of this work(More)
For the first time, inversion-channel GaN MOSFETs using atomic-layer-deposited (ALD) Al<inf>2</inf>O<inf>3</inf> as a gate dielectric have been successfully fabricated, showing well-behaved drain I&#x2013;V and transfer characteristics. The drain current was scaled with gate length, showing a maximum drain current of 10 mA/mm in a device of 1 &#x00B5;m gate(More)
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