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Topological phase transitions in line-nodal superconductors
Han, SangEun,Cho, Gil Young,Moon, Eun-Gook American Physical Society 2017 Physical Review B Vol.95 No.9
<P>Fathoming interplay between symmetry and topology of many-electron wave functions has deepened our understanding of quantum many-body systems, particularly after the discovery of topological insulators. Topology of electron wave functions often enforces and protects emergent gapless excitation, and symmetry is intrinsically tied to the topological protection of the excitations. Namely, unless the symmetry is broken, the topological nature of the excitations is intact. We show intriguing phenomena of interplay between symmetry and topology in three-dimensional topological phase transitions associated with line-nodal superconductors. More specifically, we discover an exotic universality class out of topological line-nodal superconductors. The order parameter of broken symmetries is strongly correlated with underlying line-nodal fermions, and this gives rise to a large anomalous dimension in sharp contrast to that of the Landau-Ginzburg theory. Remarkably, hyperscaling violation and emergent relativistic scaling appear in spite of the presence of nonrelativistic fermionic excitation. We also propose characteristic experimental signatures around the phase transitions, for example, a linear phase boundary in a temperature-tuning parameter phase diagram, and discuss the implication of recent experiments in pnictides and heavy-fermion systems.</P>
Recovering Device Drivers in Thread Context
SANGWOO HAN,SANGEUN HAN 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This correspondence presents the new mechanism, the thread-based recovery system for the device driver (TRSDD), which makes it possible to recover the failure of the device driver without re-initialization, as well as avoiding the redundant works and reducing time to complete over it. The several previous mechanisms introduce the efficient recovery procedures. Representatively, Nooks shows the lightweight protection area and Shadow device driver executes the reciprocal operation between kernel and device driver while system reinitializes the failed device driver. But those mechanisms embed the limitation, which system should reinitializes the device driver. Our proposed mechanism gets out of such bound.
A Selective Multilevel Successive Elimination Algorithm for Block Matching Motion Estimation
SANGWOO HAN,SANGEUN HAN 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This correspondence presents a fast full search algorithm for motion estimation ?- a selective multilevel successive elimination algorithm (SMSE). Our proposed algorithm is based on the several previous ideas including SEA, MSEA and so on. Those algorithms which originate from block matching algorithm (BMA) suggest the efficient method to find the appropriate motion vector rapidly. The basic idea is to skip dividing into smaller sub-blocks in fine granularity successive elimination algorithm (FGSE) if being redundant and keep searching whether candidate block is possible to give off the minimum matching error. Comparative experiments show the substantial improvement of the performance over the FGSE and MSEA.