Yong-Joon Kim
Pohang University of Science and Technology · 物理学・天文学
研究室紹介
Professor Yong-Joon Kim's research lab specializes in magnetic fusion energy research, focusing on advanced tokamak plasma physics and steady-state operation relevant to ITER and future fusion reactors. The lab conducts experimental and computational studies on plasma equilibrium, stability, and confinement in the KSTAR (Korea Superconducting Tokamak Advanced Research) device, with emphasis on achieving high-performance, long-pulse H-mode plasmas. The team also explores active and passive control of magnetohydrodynamic (MHD) instabilities and develops advanced diagnostics and data analysis techniques, including real-time plasma control and neutron tagging in neutrino detection experiments.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
6Since the successful first plasma generation in the middle of 2008, three experimental campaigns were successfully made for the KSTAR device, accompanied with a necessary upgrade in the power supply, heating, wall-conditioning and diagnostic systems. KSTAR was operated with the toroidal magnetic field up to 3.6 T and the circular and shaped plasmas with current up to 700 kA and pulse length of 7 s, have been achieved with limited capacity of PF magnet power supplies. The mission of the KSTAR exp
Since the first H-mode discharges in 2010, the duration of the H-mode state has been extended and a significantly wider operational window of plasma parameters has been attained. Using a second neutral beam (NB) source and improved tuning of equilibrium configuration with real-time plasma control, a stored energy of Wtot ??? 450 kJ has been achieved with a corresponding energy confinement time of ??E ??? 163 ms. Recent discharges, produced in the fall of 2012, have reached plasma ??N up to 2.9 a
Along with an expanded evaluation of the equilibrium operating space of the Korea Superconducting Tokamak Advanced Research, KSTAR, experimental equilibria of the most recent plasma discharges were reconstructed using the EFIT code. In near-circular plasmas created in 2009, equilibria reached a stored energy of 54 kJ with a maximum plasma current of 0.34 MA. Highly shaped plasmas with near double-null configuration in 2010 achieved H-mode with clear edge localized mode (ELM) activity, and transi
Abstract We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-I
In this paper, we introduce new codes for the private information retrieval (PIR). The conventional Tian-Sun-Chen (TSC) scheme achieves PIR capacity under the perfect privacy conditions with the minimum message length. Based on the TSC scheme, weakly PIR (WPIR) schemes have been developed to benefit download costs by relaxing privacy. We show that the proposed scheme has lower download cost than the TSC scheme in the weak privacy setting. While our scheme is not capacity-achieving under perfect