18 citations · 51 across the 14 of their papers we have counts for
16 papers
A Shy Voter Model: Entropy Flux in Opinion Formation
Cook Hyun Kim, Sangjoon Park, B. Kahng
Some voters conceal their opinions, causing a mismatch between visible and private opinions in polls. Conventional voter models do not account for such concealment. Here, we introd…
Migration Flows: Population Scaling and Heavy Tails
Cook Hyun Kim, Sangjoon Park, Seoyoung Jin +1
We show how migration between counties in different cities can explain both the population scaling of mean intercity flows and heavy-tailed intercity net-flow distributions. Densit…
Exact diffusion coefficients for quantum--classical hybrid walks
Cook Hyun Kim, Jaesub Park, Namshik Han
One-dimensional quantum--classical hybrid walks are introduced by combining quantum and classical steps under periodic and random protocols. Exact diffusion coefficients are derive…
Synchronization Pathways and Resilience in Power Grids
Cook Hyun Kim, Jihye Kim, Sangjoon Park +1
Ensuring a sustainable energy supply requires maintaining power-grid stability. Rotor dynamics are governed by the swing equation, which takes the form of a second-order Kuramoto m…
Heterogeneous Network Topology Induces the Widom Line
Cook Hyun Kim, B. Kahng
The Widom line, initially identified as a crossover line between liquid-like and gas-like behavior in water and supercritical fluids, separates these two types of behavior. Here, w…
Paths to synchronization in the Kuramoto model with inertia
Cook Hyun Kim, Yeomoon Kim, Stefano Boccaletti +1
Synchronization is ubiquitous across natural and synthetic systems, yet most prior studies focus on the inertia-free Kuramoto model and do so at the macroscopic level. In this stud…
Phase lag enhances synchronization in coupled oscillators with inertia
Sudo Yi, Cook Hyun Kim, Heetae Kim +1
The second-order Kuramoto model with inertia exhibits different dynamical behaviors than the first-order KM without inertia. A central difference is its lower synchronization due t…
Ashkin-Teller model with antiferromagnetic four-spin interactions: Interference effect between two conflicting issues
Cook Hyun Kim, Hoyun Choi, Joonsung Jung +1
Spin systems have emerged as powerful tools for understanding collective phenomena in complex systems. In this work, we investigate the Ashkin--Teller (AT) model on random scale-fr…
Cluster-Mediated Synchronization Dynamics in Globally Coupled Oscillators with Inertia
Cook Hyun Kim, Jinha Park, Young Jin Kim +3
Globally coupled oscillator systems with inertia exhibit complex synchronization patterns, among which the emergence of a couple of secondary synchronized clusters (SCs) in additio…
From Spatial to Spectral: Network Renormalization via Dynamical Correlations
Cook Hyun Kim, B. Kahng
Network renormalization has traditionally relied on spatial adjacency-grouping nearby nodes together, but this approach fails to capture the dynamical correlations that govern syst…
Optimal location of reinforced inertia to stabilize power grids
Sangjoon Park, Cook Hyun Kim, B. Kahng
The increasing adoption of renewable energy sources has significantly reduced the inertia in the modernized power grid, making the system more vulnerable. One way to stabilize the…
Reinforcement Learning Optimizes Power Dispatch in Decentralized Power Grid
Yongsun Lee, Hoyun Choi, Laurent Pagnier +6
Effective frequency control in power grids has become increasingly important with the increasing demand for renewable energy sources. Here, we propose a novel strategy for resolvin…
Entropy-Induced Phase Transitions in a Hidden Potts Model
Cook Hyun Kim, D. -S. Lee, B. Kahng
A hidden state in which a spin does not interact with any other spin contributes to the entropy of an interacting spin system. Using the Ginzburg-Landau formalism in the mean-field…
Prediction and mitigation of nonlocal cascading failures using graph neural networks
Bukyoung Jhun, Hoyun Choi, Yongsun Lee +3
Cascading failures (CFs) in electrical power grids propagate nonlocally; After a local disturbance, the second failure may be distant. To study the avalanche dynamics and mitigatio…
Link overlap influences opinion dynamics on multiplex networks: spin model approach
Cook Hyun Kim, Minjae Jo, J. S. Lee +2
Consider a multiplex network formed by two layers indicating social interactions: the first layer is a friendship network and the second layer is a network of business relations. I…
Stochastic Dynamics of Infrared Fluctuations in Accelerating Universe
Gihyuk Cho, Cook Hyun Kim, Hiroyuki Kitamoto
We extend investigations of infrared dynamics in accelerating universes. In the presence of massless and minimally coupled scalar fields, physical quantities may acquire growing ti…