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Dive into the research topics where Keun-Young Kim is active.

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Featured researches published by Keun-Young Kim.


PLOS Computational Biology | 2005

Potential energy landscape and robustness of a gene regulatory network: toggle switch.

Keun-Young Kim; Jin Wang

Finding a multidimensional potential landscape is the key for addressing important global issues, such as the robustness of cellular networks. We have uncovered the underlying potential energy landscape of a simple gene regulatory network: a toggle switch. This was realized by explicitly constructing the steady state probability of the gene switch in the protein concentration space in the presence of the intrinsic statistical fluctuations due to the small number of proteins in the cell. We explored the global phase space for the system. We found that the protein synthesis rate and the unbinding rate of proteins to the gene were small relative to the protein degradation rate; the gene switch is monostable with only one stable basin of attraction. When both the protein synthesis rate and the unbinding rate of proteins to the gene are large compared with the protein degradation rate, two global basins of attraction emerge for a toggle switch. These basins correspond to the biologically stable functional states. The potential energy barrier between the two basins determines the time scale of conversion from one to the other. We found as the protein synthesis rate and protein unbinding rate to the gene relative to the protein degradation rate became larger, the potential energy barrier became larger. This also corresponded to systems with less noise or the fluctuations on the protein numbers. It leads to the robustness of the biological basins of the gene switches. The technique used here is general and can be applied to explore the potential energy landscape of the gene networks.


Journal of High Energy Physics | 2014

Coherent/incoherent metal transition in a holographic model

Keun-Young Kim; Kyung Kiu Kim; Yunseok Seo; Sang-Jin Sin

A bstractWe study AC electric (σ), thermoelectric (α), and thermal κ¯


Journal of High Energy Physics | 2010

Holographic description of the phase diagram of a chiral symmetry breaking gauge theory

Nick Evans; Astrid Gebauer; Keun-Young Kim; Maria Magou


Journal of High Energy Physics | 2008

The chiral model of Sakai-Sugimoto at finite baryon density

Keun-Young Kim; Sang-Jin Sin; Ismail Zahed

\left(\overline{\kappa}\right)


Physics Letters B | 2011

Phase diagram of the D3/D5 system in a magnetic field and a BKT transition

Nick Evans; Astrid Gebauer; Keun-Young Kim; Maria Magou


Journal of High Energy Physics | 2008

Dense Holographic QCD in the Wigner-Seitz Approximation

Keun-Young Kim; Sang-Jin Sin; Ismail Zahed

conductivities in a holographic model, which is based on 3+1 dimensional Einstein-Maxwell-scalar action. There is momentum relaxation due to massless scalar fields linear to spatial coordinate. The model has three field theory parameters: temperature (T), chemical potential (μ), and effective impurity (β). At low frequencies, if β < μ, all three AC conductivities (σ, α,κ¯


Journal of High Energy Physics | 2015

Thermoelectric Conductivities at Finite Magnetic Field and the Nernst Effect

Keun-Young Kim; Kyung Kiu Kim; Yunseok Seo; Sang-Jin Sin


Journal of High Energy Physics | 2008

Baryonic response of dense holographic QCD

Keun-Young Kim; Ismail Zahed

\overline{\kappa}


Journal of High Energy Physics | 2011

The open string membrane paradigm with external electromagnetic fields

Keun-Young Kim; Jonathan P. Shock; Javier Tarrio


Journal of High Energy Physics | 2008

Electromagnetic baryon form factors from holographic QCD

Keun-Young Kim; Ismail Zahed

) exhibit a Drude peak modified by pair creation contribution (coherent metal). The parameters of this modified Drude peak are obtained analytically. In particular, if β ≪ μ the relaxation time of electric conductivity approaches to 23μ/β2

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Nick Evans

University of Southampton

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Chao Niu

Gwangju Institute of Science and Technology

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Run-Qiu Yang

Korea Institute for Advanced Study

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Kyung Kiu Kim

Gwangju Institute of Science and Technology

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Maria Magou

University of Southampton

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