Search results for: I. W. Kim

Items from 1 to 10 out of 10 results

article

Heat and Light Measurement of a ${}^{40}{\rm Ca} {}^{100} {\rm MoO}_4$ Crystal for the AMoRE Double Beta Decay Experiment

G. B. Kim, J. H. Choi, H. S. Jo, C. S. Kang, more

IEEE Transactions on Nuclear Science > 2016 > 63 > 2-1 > 539 - 542

The simultaneous measurement of heat and light signals from a ${}^{40}{\rm Ca} {}^{100} {\rm MoO}_4$ scintillating crystal was performed at temperatures of tens of milli-kelvin using a scintillating bolometric detector. The crystal was instrumented with a pair of low-temperature detectors, consisting of a metallic magnetic calorimeter for reading the phonon signals and a light detector based on a Ge...

article

Development of Metallic Magnetic Calorimeters with a Critical Temperature Switch

S. R. Kim, J. Choi, H. S. Jo, C. S. Kang, more

Journal of Low Temperature Physics > 2016 > 184 > 1-2 > 356-362

We report on the progress in the development of meander-shaped metallic magnetic calorimeters (MMCs) with a critical temperature switch. A niobium meander-shaped coil in an MMC is arranged to form a superconducting loop. It is to measure the change in magnetization and to apply a persistent current that magnetizes the MMC sensor material. In this work, part of the superconducting loop is fabricated...

article

Growth temperature dependence of the crystal orientation and the magnetic properties of CoMn₂O₄ thin films

T. Y. Koo, J. -Y. Kim, S. H. Kang, I. W. Kim, more

Journal of the Korean Physical Society > 2013 > 63 > 3 > 681-685

We successfully grew epitaxial CoMn₂O₄ thin films on Nb(0.1wt)-doped SrTiO₃(001) single crystal substrates for the first time using the pulsed laser deposition technique and studied growth temperature dependencies of their structural and magnetic properties. Interestingly, the crystal orientation of the films depends on the growth temperature. At temperature below 870 °C, the surface normal direction...

article

The effect of non-equilibrium condensation on the drag coefficient in a transonic airfoil flow

I. W. Kim, M. M. A. Alam, S. J. Lee, Y. D. Kwon, more

Journal of Thermal Science > 2012 > 21 > 6 > 518-524

In this study, a transonic flow past NACA0012 profile at angle of attack α=0⁰ whose aspect ratio AR is 1.0 with non-equilibrium condensation is analyzed by numerical analysis using a TVD scheme and is investigated using an intermittent indraft type supersonic wind tunnel. Transonic flows of 0.78–0.90 in free stream Mach number with the variations of the stagnation relative humidity(Φ₀) are tested...

article

Landscape of supersymmetric particle mass hierarchies in deflected mirage mediation

B. Altunkaynak, B. D. Nelson, L. L. Everett, Y. Rao, more

The European Physical Journal Plus > 2012 > 127 > 1 > 1-25

With the aim of uncovering viable regions of parameter space in deflected mirage mediation (DMM) models of supersymmetry breaking, we study the landscape of particle mass hierarchies for the lightest four non-Standard Model states for DMM models and compare the results to that of minimal supergravity/constrained MSSM (mSUGRA/CMSSM) models, building on previous studies of Feldman, Liu, and Nath. Deflected...

article

Growth of epitaxial DyMn₂O₅ thin films and their magnetic properties

Tae Yeong Koo, S. H. Kang, I. W. Kim, Yoon Hee Jeong, more

Journal of the Korean Physical Society > 2012 > 61 > 9 > 1528-1531

We grew highly epitaxial DyMn₂O₅ (DMO) thin films on Nb-doped TiO₂(110) single crystal substrates by using the pulsed laser deposition technique and studied their magnetic properties. The surface normal crystal direction changed from DMO(002) to DMO(211) with increasing growth temperature from 750 °C to 950 °C. Bulk-like magnetic properties were observed for the film grown at 950 °C while behaviors...

chapter

Microwave photonic waveform generation using low-speed electronics and optical repetition rate multiplication

I W Kim, D S Seo

2010 IEEE Photinic Society's 23rd Annual Meeting > 136 - 137

2010 23rd Annual Meeting of the IEEE Photonics Society (Formerly LEOS Annual Meeting)

We demonstrate several tens of gigahertz microwave photonic waveform generation from a semiconductor fiber ring laser by injecting a Fabry-Perot laser diode output which is gain-switched at a few GHz.

article

Synthesis of (Ba_0.5Sr_0.5)(Ti_1 − xZr_x)O₃ ceramics: Effect of Zr content on room temperature electrical properties

S. K. Rout, P. K. Barhai, S. Panigrahi, I. W. Kim

Journal of Electroceramics > 2009 > 23 > 1 > 37-42

The phase formation behavior and room temperature dielectric properties of bulk perovskite solid solution composition (Ba_0.5Sr_0.5)(Ti_1 − xZr_x)O₃ have been investigated. The samples with different Zr-content were prepared through solid state reaction. The XRD investigation showed that Zr⁺⁴ is systematically dissolved in Ba_0.5Sr_0.5TiO₃ lattice up to about 60 atm.% substitution, having cubic Pm3m...

article

Growth mode in strained ZnO films on Al₂O₃(0001) during sputtering

I. W. Kim, H. S. Kim, S. J. Doh, J. H. Je, more

Journal of Electroceramics > 2006 > 17 > 2-4 > 327-330

We investigated the temperature dependence of growth mode in highly mismatched sputter-grown ZnO/Al₂O₃(0001) heteroepitaxial films using real-time synchrotron X-ray scattering. We find that the growth mode changes from 2 dimensional (2D) layer to 3D island in early growth stage with temperature (300^∘C–500^∘C). At around 400^∘C, however, intermediate 2D platelets nucleate in early stage, act as nucleation...

article

Supersymmetry breaking in warped geometry

K. Choi, D. Y. Kim, I.-W. Kim, T. Kobayashi

The European Physical Journal C > 2004 > 35 > 2 > 267-275

We examine the soft supersymmetry breaking parameters in supersymmetric theories on a slice of AdS5 which generate the hierarchical Yukawa couplings by dynamically quasi-localizing the bulk matter fields in an extra dimension. Such models can be regarded as the AdS dual of the recently studied 4-dimensional models which contain a supersymmetric CFT to generate the hierarchical Yukawa couplings. In...

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