13 Result(s)
within
M. Y. Choi
Physics
English
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Article
Open AccessOn the thermodynamic entropy in the microcanonical ensemble of classical systems
We demonstrate that the surface entropy given by the volume of an energy shell in the phase space can be the thermodynamically consistent entropy in a classical microcanonical ensemble if the thickness of the ...
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Article
Principles for the emergence of computational properties in a complex system
Understanding how a natural computing system like the brain works or learns requires an approach from a different point of view than an artificially developed computing system. Such a natural computing system ...
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Article
Spatiotemporal behaviors of the ridership of a public transportation system during an epidemic outbreak: case of MERS in Seoul
During May and June 2015, an outbreak of the Middle East respiratory syndrome (MERS) occurred in Korea, which raised the fear of contagion throughout society and suppressed the use of public transportation sys...
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Article
A neural network model based on the cortical modularity
Although the individual cortical areas in the brain support very diverse functions, their anatomical organizations are very similar, given by collections of cortical blocks with nearly the same structure. This...
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Article
Response Theory of Spiking Neural Networks
The Feynman machine is a unique model expressing spiking-timing-dependent neural interactions through path integrals. It provides the capability to predict neural firing statistics very precisely. If time-orde...
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Article
Interaction Effects on the Size Distribution in a Growth Model
We study, both analytically and numerically, the interaction effects on the skewness of the size distribution of elements in a growth model. We incorporate two types of global interaction into the growth model...
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Article
Traveling cluster pairs in a system of phase oscillators with positive and negative couplings under a periodic driving field
We investigate numerically the clustering behavior of a system of phase oscillators with positive and negative couplings under a periodic external driving field with a bimodal distribution of driving phases. T...
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Article
Estimate of the phase transition line in the infinite-dimensional Hubbard model
We consider a Mott transition of the Hubbard model in infinite dimensions. The dynamical meanfield theory is employed in combination with a continuous-time quantum Monte Carlo (CTQMC) method for an accurate de...
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Article
Dynamic characteristics of tweeting and tweet topics
Twitter, having more than 200 million world users and more than 4 million Korean users, is still growing fast. Because Twitter users can ‘tweet’ about any topic within the 140-character limit, and other users ...
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Article
Phase transitions in confined water nanofilms
Phase transitions in water are normally classified as first or second order. But in confined quasi-one-dimensional films of water, simulations show that the solid–liquid transition can take place by means of a...
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Article
Static and dynamic behaviors of the two-dimensional XY gauge glass
We study the phase transition and relaxation dynamics of the two-dimensional XY gauge glass, with regard to the possiblity of glassy behavior. In particular we investigate the defect-wall energy and correlatio...
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Chapter
Topological Quantization in Superconducting Arrays
Two-dimensional arrays of superconducting grains, weakly coupled by Josephson junctions, provide interesting model systems for the study of dynamical behaviors as well as phase transitions [1], which are large...
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Chapter and Conference Paper
Optimization by Multicanonical Annealing and the Traveling-Salesman Problem
We demonstrate a powerful and general simulated annealing method to study combinatorial optimization problems. It combines the multicanonical method, which samples directly the microcanonical entropy of the sy...
