H. S. Ko

ORCID: 0000-0001-7742-9823
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About
Contact & Profiles
Research Areas
  • High-Energy Particle Collisions Research
  • Particle physics theoretical and experimental studies
  • Quantum Chromodynamics and Particle Interactions
  • Muon and positron interactions and applications
  • Particle accelerators and beam dynamics
  • Particle Detector Development and Performance
  • Nuclear physics research studies
  • Particle Accelerators and Free-Electron Lasers
  • Stochastic processes and statistical mechanics
  • Nuclear reactor physics and engineering
  • Dark Matter and Cosmic Phenomena
  • Markov Chains and Monte Carlo Methods
  • Statistical Methods and Bayesian Inference
  • Appendicitis Diagnosis and Management
  • Ion-surface interactions and analysis
  • Radiation Detection and Scintillator Technologies
  • Advanced Image Processing Techniques
  • Gamma-ray bursts and supernovae
  • Atomic and Subatomic Physics Research
  • Pulsars and Gravitational Waves Research
  • Ichthyology and Marine Biology
  • Biochemical and Structural Characterization
  • Advanced NMR Techniques and Applications
  • Nuclear Physics and Applications
  • CCD and CMOS Imaging Sensors

Lawrence Berkeley National Laboratory
2021-2025

Frankfurt Institute for Advanced Studies
2022-2024

Variable Energy Cyclotron Centre
2024

Ball State University
2022-2024

Argonne National Laboratory
2022-2024

Seoul National University
2017-2024

Yale University
2023-2024

AGH University of Krakow
2024

Wayne State University
2024

Warsaw University of Technology
2024

This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...

10.1093/ptep/ptz030 article EN cc-by Progress of Theoretical and Experimental Physics 2019-03-18

We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values Bjorken variable x_{B}. DVCS is sensitive to generalized parton distributions nucleon, which provide a three-dimensional description its internal constituents. Using exact analytic expression for all possible polarization states initial and final electron state photon, we present first experimental extraction four helicity-conserving form factors (CFFs) nucleon as function...

10.1103/physrevlett.128.252002 article EN cc-by Physical Review Letters 2022-06-23

Our study examines the association between inventory management decisions and equity-based compensation incentives. Using S&P 1500 manufacturing firms from 1994 to 2018, we find a positive CEO incentives investment decreasing less with sales decline than rising for an equivalent increase (i.e., asymmetric investment). We also that is weakened by strong external monitoring asymmetry driven leads worse future performance. Given critical role of in firm profitability, our findings reveal while...

10.2139/ssrn.5071288 article EN SSRN Electronic Journal 2025-01-01

Quasielastic $^{12}$C$(e,e'p)$ scattering was measured at space-like 4-momentum transfer squared $Q^2$~=~8, 9.4, 11.4, and 14.2 (GeV/c)$^2$, the highest ever achieved to date. Nuclear transparency for this reaction extracted by comparing yield that expected from a plane-wave impulse approximation calculation without any final state interactions. The consistent with no $Q^2$ dependence, up proton momenta of 8.5~GeV/c, ruling out quantum chromodynamics effect color scales in exclusive...

10.1103/physrevlett.126.082301 article EN Physical Review Letters 2021-02-23

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values x_{B} (0.36, 0.48, and 0.60) Q^{2} (3.1 to 8.4 GeV^{2}) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions dσ_{T}/dt+εdσ_{L}/dt, dσ_{TT}/dt, dσ_{LT}/dt, dσ_{LT^{'}}/dt are extracted as a function proton momentum transfer t-t_{min}. results suggest amplitude for transversely polarized virtual photons continues dominate throughout this...

10.1103/physrevlett.127.152301 article EN cc-by Physical Review Letters 2021-10-05

Muons have been accelerated by using a radio-frequency accelerator for the first time. Negative muonium atoms (${\mathrm{Mu}}^{\ensuremath{-}}$), which are bound states of positive muons (${\ensuremath{\mu}}^{+}$) and two electrons, generated from ${\ensuremath{\mu}}^{+}$'s through electron capture process in an aluminum degrader. The ${\mathrm{Mu}}^{\ensuremath{-}}$'s initially electrostatically injected into quadrupole linac (RFQ). In RFQ, to 89 keV. identified momentum measurement time...

10.1103/physrevaccelbeams.21.050101 article EN cc-by Physical Review Accelerators and Beams 2018-05-18

The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for first time in $^{10}$B and $^{11}$B. Previous measurements effect $A \leq 12$ nuclei showed an unexpected dependence; $^{11}$B were to explore this region more detail. Results are presented $^9$Be, $^{10}$B, $^{11}$B, $^{12}$C at incident beam energy 10.6~GeV. boron isotopes was found be similar that $^9$Be $^{12}$C, yielding almost no range $A=4-12$. This represents...

10.1103/physrevc.108.035201 article EN publisher-specific-oa Physical review. C 2023-09-05

10.1016/j.nima.2018.05.014 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2018-05-16

This paper introduces a new approach to measure the muon magnetic moment anomaly $a_{\mu} = (g-2)/2$, and electric dipole (EDM) $d_{\mu}$ at J-PARC facility. The goal of our experiment is $a_{\mu}$ using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing $g-2$ experiments unprecedented quality storage field. Additional significant differences from present experimental include 1,000 transverse emittance beam (reaccelerated...

10.48550/arxiv.1901.03047 preprint EN other-oa arXiv (Cornell University) 2019-01-01

Interdomain interaction of apo-cyclic AMP receptor protein (apo-CRP) was qualified using its isolated domains. The cAMP-binding domain prepared by a limited proteolysis, while the DNA-binding constructed as recombinant protein. Three different regions making interdomain contacts in apo-CRP were identified sequence-specific comparison HSQC spectra. results indicated that possesses characteristic modules are properly organized to suppress activity and sense transfer cAMP binding signals....

10.1093/jb/mvm238 article EN The Journal of Biochemistry 2007-12-15

Unlike other microbothriid monogenean infections in elasmobranchs, limited information is available on the biology and treatment of Dermophthirius melanopteri. As parasitic infection with D. melanopteri was found 21 juvenile blacktip reef sharks (Carcharhinus melanopterus) at Lotteworld aquarium Seoul, South Korea, we aimed to investigate anatomical features protocols for this study. The parasites were sampled fixed 10% neutral-buffered formalin, examined using light scanning electron...

10.3390/microorganisms12122558 article EN cc-by Microorganisms 2024-12-12

3D super-resolution aims to reconstruct high-fidelity models from low-resolution (LR) multi-view images. Early studies primarily focused on single-image (SISR) upsample LR images into high-resolution However, these methods often lack view consistency because they operate independently each image. Although various post-processing techniques have been extensively explored mitigate inconsistencies, yet fully resolve the issues. In this paper, we perform a comprehensive study of by leveraging...

10.48550/arxiv.2412.11525 preprint EN arXiv (Cornell University) 2024-12-16

The muon g−2/EDM experiment at J-PARC aims to measure the anomalous magnetic moment and electric dipole with high precision by utilising an ultracold beam. current g−2 discrepancy between Standard Model prediction experimental value is about 3.5 standard deviations. This requires a development of LINAC accelerate thermal muons 300 MeV/c momentum. Detectors for beam diagnostics play key role in such experiment. profile monitoring system has been designed low energy It was tested during two...

10.1088/1748-0221/12/09/c09001 article EN Journal of Instrumentation 2017-09-04

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental program at next generation of lepton accelerators. In context Hadronic Physics Jefferson Laboratory (JLab), positron beams complementary, even essential, tools a precise understanding electromagnetic structure nucleon, in elastic deep-inelastic regimes. For instance, scattering (un)polarized electrons positrons off nucleon allows model independent determination form factors nucleon....

10.48550/arxiv.1906.09419 preprint EN other-oa arXiv (Cornell University) 2019-01-01

Higher-order cumulants of the conserved quantities and their ratios are powerful tools to study properties QGP explore QCD phase structure, such as critical point and/or first-order transition boundary. In this proceedings, we present recent results higher-order at different collision energies. We compare with hadronic transport model, Hadron Resonance Gas thermodynamic calculations discuss physics implications. Additionally, mention near future cumulant analyses an initial volume fluctuation issue.

10.1051/epjconf/202327601019 article EN cc-by EPJ Web of Conferences 2023-01-01

Quasi-elastic scattering on $^{12}$C$(e,e'p)$ was measured in Hall C at Jefferson Lab for space-like 4-momentum transfer squared $Q^2$ the range of 8--14.2\,(GeV/$c$)$^2$ with proton momenta up to 8.3\,GeV/$c$. The experiment carried out upgraded Lab. It used existing high momentum spectrometer and new super detect scattered electrons protons coincidence. nuclear transparency extracted as ratio yield calculated plane wave impulse approximation. Additionally, $1s_{1/2}$ $1p_{3/2}$ shell...

10.1103/physrevc.108.025203 article EN Physical review. C 2023-08-14

We have measured the muon beam profile after acceleration using a radio frequency quadrupole linac (RFQ). Positive muons are injected to an aluminum degrader and negative muoniums (Mu−) generated. The generated Mu−'s extracted by electrostatic lens accelerated 89 keV RFQ. transported monitor (BPM) through magnet pair bending magnet. BPM consists of micro-channel plate, phosphor screen, CCD camera. in vertical direction is consistent with simulation. This measurement one milestones for...

10.1088/1742-6596/1067/5/052012 article EN Journal of Physics Conference Series 2018-09-01
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