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Seoul, South Korea

Sogang University is one of the leading research and liberal arts universities of South Korea. The university was established in 1960 by the Wisconsin province of the Society of Jesus to provide education based on Catholic beliefs inspired by the Jesuit education philosophy. Sister schools of Sogang founded on Jesuit philosophies include Georgetown University and Sophia University.It ranked first in Korea among four-year universities without medical schools in JoongAng Ilbo's University Ranking Evaluation in 2008 and second in Korea in terms of reputation of graduates' ability in Chosun Ilbo's University Ranking Evaluation in 2009. Wikipedia.

Copland N.B.,Sogang University
Journal of High Energy Physics | Year: 2012

We show that generalised metric equation of motion of doubled field theory (the vanishing of the generalised Ricci tensor) can be derived as the background field equation of a double sigma model. Thus the double field theory is the effective field theory for the sigma model. © 2012 SISSA. Source

Moon J.H.,Sogang University | Yang S.,University of Pennsylvania
Chemical Reviews | Year: 2010

The chemical aspects of three-dimensional photonic crystals have been reported. Three-dimensional (3D) photonic crystals (PCs) are crystalline materials where the refractive index is periodically modulated on a length scale comparable to the light wavelength. 3D PCs that can reflect light from any direction or guide photons potentially offer revolutionary advances in the next generation microphotonic devices and the integration of existing opto-electronic devices. The control of surface chemistry, composition, and concentration of colloidal particles and choice of dispersion medium are critical to the long-range ordering and orientation in colloidal crystals. Rising interest is witnessed in creating 3D structures from environmentally responsive materials, such as hydrogels, and through infiltration of responsive nanoparticles into the 3D templates. Source

Son C.-H.,Sogang University
Optics Letters | Year: 2012

This Letter proposes a novel inverse halftoning algorithm that introduces a way of generating a pair of binary and continuous dictionaries optimized to a training image database composed of many pairs of halftoned patches and the corresponding continuous patches. The experiment results show that the two created binary and continuous dictionaries can be nicely used with the estimated sparse coefficients to represent an unknown continuous image with less noise and fine details from an input halftoned image. © 2012 Optical Society of America. Source

Park C.,Sogang University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

We investigate the dissociation of a heavy meson in the medium composed of light quarks and gluons. In the quark-gluon plasma, the dissociation length of the heavy meson becomes short as the temperature or quark chemical potential increases. On the contrary, in the hadronic phase the dissociation length becomes large as the chemical potential increases, due to the different dissociation mechanism with one used in the quark-gluon plasma. © 2010 The American Physical Society. Source

Pang D.-W.,Sogang University
Journal of High Energy Physics | Year: 2010

We obtain exact solutions of charged asymptotically Lifshitz black holes in arbitrary (d + 2) dimensions, generalizing the four dimensional solution investigated in 0908.2611[hep-th]. We find that both the conventional Hamiltonian approach and the recently proposed method for defining mass in non-relativistic backgrounds do not work for this specific example. Thus the mass of the black hole can only be determined by the first law of thermodynamics. We also obtain perturbative solutions in five-dimensional Gauss-Bonnet gravity. The ratio of shear viscosity over entropy density and the DC conductivity are calculated in the presence of Gauss-Bonnet corrections. © SISSA 2010. Source

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