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Comment on ``Loss of Superconducting Phase Coherence in YBa_2Cu_3O_7 Films: Vortex-Loop Unbinding and Kosterlitz-Thouless Phenomena''
Kateryna Medvedyeva, Beom Jun Kim, Petter Minnhagen
Recently, Kotzler et al. measured the frequency-dependent conductance for YBa_2Cu_3O_7 and interpreted their results as evidences that the decay of the superfluid density is caused…
Dynamic instabilities induced by asymmetric influence: Prisoners' dilemma game on small-world networks
Beom Jun Kim, Ala Trusina, Petter Holme +3
A two-dimensional small-world type network, subject to spatial prisoners' dilemma dynamics and containing an influential node defined as a special node with a finite density of dir…
Stochastic resonance in the driven Ising model on small-world networks
H. Hong, Beom Jun Kim, M. Y. Choi
We investigate the stochastic resonance phenomena in the field-driven Ising model on small-world networks. The response of the magnetization to an oscillating magnetic field is exa…
Dynamic transitions and resonances in Josephson-junction arrays under oscillating magnetic fields
Gun Sang Jeon, Hyun Jin Kim, M. Y. Choi +2
We investigate dynamic transitions and stochastic resonance phenomena in two-dimensional fully frustrated Josephson-junction arrays driven by staggered oscillating magnetic fields.…
Comment on "Ising model on a small world network"
H. Hong, Beom Jun Kim, M. Y. Choi
In the recent study of the Ising model on a small-world network by A. Pȩkalski [Phys. Rev. E {\bf 64}, 057104 (2001)], a surprisingly small value of the critical exponent $β\approx…
Vertex overload breakdown in evolving networks
Petter Holme, Beom Jun Kim
We study evolving networks based on the Barabasi-Albert scale-free network model with vertices sensitive to overload breakdown. The load of a vertex is defined as the betweenness c…
Phase ordering on small-world networks with nearest-neighbor edges
H. Hong, M. Y. Choi, Beom Jun Kim
We investigate global phase coherence in a system of coupled oscillators on a small-world networks constructed from a ring with nearest-neighbor edges. The effects of both thermal…
Attack vulnerability of complex networks
Petter Holme, Beom Jun Kim, Chang No Yoon +1
We study the response of complex networks subject to attacks on vertices and edges. Several existing complex network models as well as real-world networks of scientific collaborati…
Splitting of the superconducting transition in the two weakly coupled 2D XY models
Kateryna Medvedyeva, Beom Jun Kim, Petter Minnhagen
The frequency and temperature T dependent complex conductivity of two weakly coupled 2D XY models subject to the RSJ dynamics is studied through computer simulations. A dou…
Path finding strategies in scale-free networks
Beom Jun Kim, Chang No Yoon, Seung Kee Han +1
We numerically investigate the scale-free network model of Barab{á}si and Albert [A. L. Barab{á}si and R. Albert, Science {\bf 286}, 509 (1999)] through the use of various path fin…