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Network Pruning for Low-Rank Binary IndexingMay 14 2019Pruning is an efficient model compression technique to remove redundancy in the connectivity of deep neural networks (DNNs). Computations using sparse matrices obtained by pruning parameters, however, exhibit vastly different parallelism depending on ... More

U(1) symmetry of the spin-orbit coupled Hubbard model on the Kagome latticeJul 14 2015Oct 29 2015We study the symmetry properties of the single-band Hubbard model with general spin-orbit coupling (SOC) on the Kagome lattice. We show that the global U(1) spin-rotational symmetry is present in the Hubbard Hamiltonian owing to the inversion symmetry ... More

Topological Transport of Vorticity in Heisenberg MagnetsOct 24 2018Dec 21 2018We study a robust topological transport carried by vortices in a thin film of an easy-plane ferromagnetic insulator between two metal contacts. A vortex, which is a nonlocal topological spin texture in two-dimensional magnets, exhibits some beneficial ... More

Magnetoelectric antiferromagnets as platforms for the manipulation of solitonsJul 07 2017We study the magnetic dynamics of magnetoelectric antiferromagnetic thin films, where an unconventional boundary ferromagnetism coexists with the bulk N\'{e}el phase below the N\'{e}el temperature. The spin exchange between the two order parameters yields ... More

Easy-Plane Magnetic Strip as a Long Josephson JunctionFeb 12 2018Spin-torque-biased magnetic dynamics in an easy-plane ferromagnet (EPF) is theoretically studied in the presence of a weak in-plane anisotropy. While this anisotropy spoils U(1) symmetry thereby quenching the conventional spin superfluidity, we show that ... More

A Polynomial Kernel for Distance-Hereditary Vertex DeletionOct 23 2016A graph is distance-hereditary if for any pair of vertices, their distance in every connected induced subgraph containing both vertices is the same as their distance in the original graph. Distance hereditary graphs are exactly the graphs with rank-width ... More

Molecular dynamics study on a nonequilibrium motion of a colloidal particle driven by an external torqueJan 17 2016Aug 31 2016We investigate the motion of a colloidal particle driven out of equilibrium by an external torque. We use the molecular dynamics simulation that is alternative to the numerical integration approach based on the Langevin equation and is expected to mimic ... More

On weak reducing disks for the unknot in $3$-bridge positionSep 28 2017We show that the complex of weak reducing disks for the unknot in $3$-bridge position is contractible.

Stacking fault energy of face-centered cubic metals: thermodynamic and ab initio approachesNov 27 2015The formation energy of the interface between face-centered cubic (fcc) and hexagonal close packed (hcp) structures is a key parameter in determining the stacking fault energy (SFE) of fcc metals and alloys using thermodynamic calculations. Often the ... More

Cooper-Pair Spin Current in a Strontium Ruthenate HeterostructureFeb 05 2018It has been recognized that the condensation of spin-triplet Cooper pairs requires not only the broken gauge symmetry but also the spin ordering as well. One consequence of this is the possibility of the Cooper-pair spin current analogous to the magnon ... More

Investigation of the transverse beam dynamics in the thermal wave model with a functional methodAug 17 2006Feb 14 2007We investigated the transverse beam dynamics in a thermal wave model by using a functional method. It can describe the beam optical elements separately with a kernel for a component. The method can be applied to general quadrupole magnets beyond a thin ... More

Continual Learning with Deep Generative ReplayMay 24 2017Dec 12 2017Attempts to train a comprehensive artificial intelligence capable of solving multiple tasks have been impeded by a chronic problem called catastrophic forgetting. Although simply replaying all previous data alleviates the problem, it requires large memory ... More

Doped Valence Bond Solid and Superconductivity on the Shastry-Sutherland LatticeJul 10 2007Oct 08 2007Motivated by recent experiments on SrCu$_2$(BO$_3$)$_2$, we investigate the ground states of the doped Mott insulator on the Shastry-Sutherland lattice. To provide a unified theoretical framework for both the valence-bond solid state found in undoped ... More

Deeply-Recursive Convolutional Network for Image Super-ResolutionNov 14 2015Nov 11 2016We propose an image super-resolution method (SR) using a deeply-recursive convolutional network (DRCN). Our network has a very deep recursive layer (up to 16 recursions). Increasing recursion depth can improve performance without introducing new parameters ... More

Fast domain wall motion induced by antiferromagnetic spin dynamics at the angular momentum compensation temperature of ferrimagnetsMar 22 2017Antiferromagnetic spintronics is an emerging research field which aims to utilize antiferromagnets as core elements in spintronic devices. A central motivation toward this direction is that antiferromagnetic spin dynamics is expected to be much faster ... More

Topological Hall effect at above room temperature in heterostructures composed of a magnetic insulator and a heavy metalApr 15 2019Non-volatile memory and computing technology rely on efficient read and write of ultra-tiny information carriers that do not wear out. Magnetic skyrmions are emerging as a potential carrier since they are topologically robust nanoscale spin textures that ... More

TraceTracker: Hardware/Software Co-Evaluation for Large-Scale I/O Workload ReconstructionSep 14 2017Block traces are widely used for system studies, model verifications, and design analyses in both industry and academia. While such traces include detailed block access patterns, existing trace-driven research unfortunately often fails to find true-north ... More

Using atomic layer deposition to hinder solvent decomposition in lithium ion batteries: first principles modeling and experimental studiesOct 06 2012Passivating lithium ion battery electrode surfaces to prevent electrolyte decomposition is critical for battery operations. Recent work on conformal atomic layer deposition (ALD) coating of anodes and cathodes has shown significant technological promise. ... More

An FPT algorithm and a polynomial kernel for Linear Rankwidth-1 Vertex DeletionApr 22 2015Jan 11 2016Linear rankwidth is a linearized variant of rankwidth, introduced by Oum and Seymour [Approximating clique-width and branch-width. J. Combin. Theory Ser. B, 96(4):514--528, 2006]. Motivated from recent development on graph modification problems regarding ... More

Study of the Top-quark Pair Production in Association with a Bottom-quark Pair from Fast Simulations at the LHCJun 16 2015Sep 25 2015A large number of top quarks will be produced at the Large Hadron Collider (LHC) for Run II period. This will allow us to measure the rare processes from the top sector in great details. We present the study of the top-quark pair production in association ... More

The Dynamics of Skyrmions in Easy-Plane Magnets induced by a Spin SupercurrentJan 01 2019We theoretically study the interaction of an isolated bimeron skyrmion in quasi-two-dimensional easy-plane magnets with a surrounding spin superfluid associated with spontaneously broken U(1) spin-rotational symmetry, revealing that skyrmion energy depends ... More

Auslander-Reiten quiver of type D and generalized quantum affine Schur-Weyl dualityJun 17 2014Jun 22 2015We first provide an explicit combinatorial description of the Auslander-Reiten quiver $\Gamma^Q$ of finite type $D$. Then we can investigate the categories of finite dimensional representations over the quantum affine algebra $U_q'(D^{(i)}_{n+1})$ $(i=1,2)$ ... More

The Denominators of normalized R-matrices of types $A_{2n-1}^{(2)}$, $A_{2n}^{(2)}$, $B_{n}^{(1)}$ and $D_{n+1}^{(2)}$Apr 27 2014Jul 03 2014Denominators of normalized $R$-matrices provide important information on finite dimensional representations over quantum affine algebras, and over quiver Hecke algebras by the generalized quantum affine Schur-Weyl duality functors. We compute the denominators ... More

SimpleSSD: Modeling Solid State Drives for Holistic System SimulationMay 18 2017Sep 14 2017Existing solid state drive (SSD) simulators unfortunately lack hardware and/or software architecture models. Consequently, they are far from capturing the critical features of contemporary SSD devices. More importantly, while the performance of modern ... More

Synthesis, anisotropy, and superconducting properties of LiFeAs single crystalFeb 11 2010A LiFeAs single crystal with $T_c^{onset}$$\sim$19.7 K was grown successfully in a sealed tungsten crucible using the Bridgeman method. The electrical resistivity experiments revealed a ratio of room temperature to residual resistivity (RRR) of approximately ... More

Auto-Meta: Automated Gradient Based Meta Learner SearchJun 11 2018Dec 10 2018Fully automating machine learning pipelines is one of the key challenges of current artificial intelligence research, since practical machine learning often requires costly and time-consuming human-powered processes such as model design, algorithm development, ... More

The Andrews-Olsson identity and Bessenrodt insertion algorithm on Young wallsDec 25 2012Jul 30 2014We extend the Andrews-Olsson identity to two-colored partitions. Regarding the sets of proper Young walls of quantum affine algebras $\g_n=A^{(2)}_{2n}$, $A^{(2)}_{2n-1}$, $B^{(1)}_{n}$, $D^{(1)}_{n}$ and $D^{(2)}_{n+1}$ as the sets of two-colored partitions, ... More

Auslander-Reiten quiver of type A and generalized quantum affine Schur-Weyl dualityMay 14 2014Mar 17 2015The quiver Hecke algebra $R$ can be also understood as a generalization of the affine Hecke algebra of type $A$ in the context of the quantum affine Schur-Weyl duality by the results of Kang, Kashiwara and Kim. On the other hand, it is well-known that ... More

Auslander-Reiten quiver and representation theories related to KLR-type Schur-Weyl dualitySep 16 2015May 11 2018We introduce new partial orders on the sequence positive roots and study the statistics of the poset by using Auslander-Reiten quivers for finite type ADE. Then we can prove that the statistics provide interesting information on the representation theories ... More

Simulation study of dose enhancement in a cell due to nearby carbon and oxygen in particle radiotherapyMar 13 2015The aim of this study is to investigate the dose-deposition enhancement by alpha-particle irradiation in a cellular model using carbon and oxygen chemical compositions.A simulation study was performed to study dose enhancement due to carbon and oxygen ... More

Emergence of robust 2D skyrmions in SrRuO3 ultrathin film without the capping layerOct 03 2018Magnetic skyrmions have fast evolved from a novelty, as a realization of topologically protected structure with particle-like character, into a promising platform for new types of magnetic storage. Significant engineering progress was achieved with the ... More

Interaction Between a Domain Wall and Spin Supercurrent in Easy-cone MagnetsSep 30 2016A domain wall and spin supercurrent can coexist in magnets with easy-cone anisotropy owing to simultaneous spontaneous breaking of Z$_2$ and U(1) symmetries. Their interaction is theoretically investigated in quasi one-dimensional ferromagnets within ... More

Spatially Resolved HCN Absorption Features in the Circumnuclear Region of NGC 1052Sep 28 2016Sep 29 2016We present the first VLBI detection of HCN molecular absorption in the nearby active galactic nucleus NGC 1052. Utilizing the 1 milliarcsecond resolution achieved by the Korean VLBI Network, we have spatially resolved the HCN absorption against a double-sided ... More

Verification of the Astrometric Performance of the Korean VLBI Network, using comparative SFPR studies with the VLBA at 14/7 mmJul 17 2014The Korean VLBI Network (KVN) is a new mm-VLBI dedicated array with capability for simultaneous observations at multiple frequencies, up to 129 GHz. The innovative multi-channel receivers present significant benefits for astrometric measurements in the ... More

Landau-Lifshitz theory of the thermomagnonic torqueMay 04 2015We derive the thermomagnonic torque associated with smooth magnetic textures subjected to a temperature gradient, in the framework of the stochastic Landau-Lifshitz-Gilbert equation. Our approach captures on equal footing two distinct contributions: (1) ... More

Pinning of a Bloch point by an atomic latticeJan 28 2013Sep 13 2013Bloch points are magnetic topological defects. The discrete nature of a magnetic lattice creates a periodic potential that can pin a Bloch point. The pinning force is of the order of the exchange constant, a few piconewtons in a typical ferromagnet (permalloy). ... More

Topological Effects on Quantum Phase Slips in Superfluid Spin TransportNov 08 2015We theoretically investigate effects of quantum fluctuations on superfluid spin transport through easy-plane quantum antiferromagnetic spin chains in the large-spin limit. Quantum fluctuations give rise to decaying of spin supercurrent by unwinding the ... More

Polynomial splittings of correction terms and doubly slice knotsNov 23 2016We show that if the connected sum of two knots with coprime Alexander polynomials is doubly slice, then the Ozsv\'ath-Szab\'o correction terms as smooth double sliceness obstructions vanish for both knots. Recently, Jeffrey Meier gave smoothly slice knots ... More

Twisted Coxeter elements and Folded AR-quivers via Dynkin diagram automorphisms:IIJun 01 2016Jul 22 2016As a continuation of the previous paper, we find a combinatorial interpretation of Dorey's rule for type $C_n$ via twisted Auslander-Reiten quivers (AR-quivers) of type $D_{n+1}$, which are combinatorial AR-quivers related to certain Dynkin diagram automorphisms. ... More

Perturbative solutions of ${\cal N}=1^*$ holography on $S^4$Apr 03 2019We apply the recently proposed perturbative technique to solve the supergravity BPS equations of ${\cal N}=1^*$ theories put on $S^4$. In particular, we have calculated the coefficients of the leading quartic terms exactly, in the expression of the universal ... More

Categorical relations between Langlands dual quantum affine algebras: Exceptional casesFeb 26 2018Feb 26 2019We first compute the denominator formulas for quantum affine algebras of all exceptional types. Then we prove the isomorphisms among Grothendieck rings of categories $C_Q^{(t)}$ $(t=1,2,3)$, $\mathscr{C}_{\mathscr{Q}}^{(1)}$ and $\mathscr{C}_{\mathfrak{Q}}^{(1)}$. ... More

Twisted Coxeter elements and folded AR-quivers via Dynkin diagram automorphisms: IMay 31 2016Oct 27 2016We introduce and study the twisted adapted $r$-cluster point and its combinatorial Auslander-Reiten quivers, called twisted AR-quivers and folded AR-quivers, of type $A_{2n+1}$ which are closely related to twisted Coxeter elements and the non-trivial ... More

A perturbative study of holographic mABJM theoryApr 20 2019Recently the calculation of holographic free energy for mass-deformed ABJM model (mABJM) with ${\cal N}=2$ supersymmetry and $SU(3)\times U(1)$ global symmetry was tackled by Bobev et al. in arXiv:1812.01026. We solve the associated BPS equations, requiring ... More

Single dish performance of KVN 21-m radio telescopes:Simultaneous observations at 22 and 43 GHzOct 18 2011We report simultaneous multi-frequency observing performance at 22 and 43 GHz of the 21-m shaped-Cassegrain radio telescopes of the Korean VLBI Network (KVN). KVN is the first millimeter-dedicated VLBI network in Korea having a maximum baseline length ... More

The pseudogap behavior in the stoichiometric FeSe superconductor (Tc~9.4 K)Nov 11 2009Feb 11 2010This paper reports the synthesis and superconducting behaviors of the tetragonal iron-chalcogenide superconductor FeSe. The electrical resistivity and magnetic moment measurements confirmed its superconductivity with a $T_c^{zero}$ and $T_c^{mag}$ at ... More

A Convolution-Free LBP-HOG Descriptor For Mammogram ClassificationMar 30 2019In image based feature descriptor design, an iterative scanning process utilizing the convolution operation is often adopted to extract local information of the image pixels. In this paper, we propose a convolution-free Local Binary Pattern (CF-LBP) and ... More

Mechanical Actuation of Magnetic Domain-Wall MotionJun 17 2016We theoretically study the motion of a magnetic domain wall induced by transverse elastic waves in a one-dimensional magnetic wire, which respects both rotational and translational symmetries. By invoking the conservation of the associated total angular ... More

Thermally-Activated Phase Slips in Superfluid Spin Transport in Magnetic WiresSep 02 2015We theoretically study thermally-activated phase slips in superfluid spin transport in easy-plane magnetic wires within the stochastic Landau-Lifshitz-Gilbert phenomenology, which runs parallel to the Langer-Ambegaokar-McCumber-Halperin theory for thermal ... More

Identification of the Au coverage and structure of the Au/Si(111)-5x2 surfaceMay 19 2014We identify the atomic structure of the Au/Si(111)-5x2 surface by using density functional theory calculations. With seven Au atoms per unit cell, our model forms a bona fide 5x2 atomic structure, which is energetically favored over the leading model ... More

Nonlocal Spin Transport Mediated by a Vortex Liquid in SuperconductorsJun 20 2018Departing from the conventional view on superconducting vortices as a parasitic source of dissipation for charge transport, we propose to use mobile vortices as topologically-stable information carriers for spin transport. To this end, we start by constructing ... More

On embeddings of the Grassmannian $Gr(2,m)$ into the Grassmannian $Gr(2,n)$Sep 22 2016In this paper, we consider holomorphic embeddings of $Gr(2,m)$ into $Gr(2,n)$. We can study such embeddings by finding all possible total Chern classes of the pull-back of the universal bundles under these embeddings. To do this, we use the relations ... More

Incorporating User Interaction into Imperative LanguagesAug 16 2015Adding versatile interactions to imperative programming -- C, Java and Android -- is an essential task. Unfortunately, existing languages provide little constructs for user interaction. We propose a computability-logical approach to user interaction. ... More

Logic Programming with Macro ConnectivesAug 13 2015Jun 21 2016Logic programming such as Prolog is often sequential and slow because each execution step processes only a single, $micro$ connective. To fix this problem, we propose to use $macro$ connectives as the means of improving both readability and performance. ... More

Combining Fixed-Point Definitions and Game Semantics in Logic ProgrammingJul 26 2015Aug 05 2015Logic programming with fixed-point definitions is a useful extension of traditional logic programming. Fixed-point definitions can capture simple model checking problems and closed-world assumptions. Its operational semantics is typically based on intuitionistic ... More

Bounded Choice Queries for Logic ProgrammingMay 27 2013Aug 03 2013Adding versatile interactions to goals and queries in logic programming is an essential task. Unfortunately, existing logic languages can take input from the user only via the $read$ construct. We propose to add a new interactive goal to allow for more ... More

A Logical Approach to Event Handling in Imperative LanguagesAug 26 2015While event handling is a key element in modern interactive programming, it is unfortunate that its theoretical foundation is rather weak. To solve this problem, we propose to adopt a game-logical approach of computability logic \cite{Jap08} to event ... More

A New Execution Model for the logic of hereditary Harrop formulasJul 07 2015The class of first-order Hereditary Harrop formulas ($fohh$) is a well-established extension of first-order Horn clauses. Its operational semantics is based on intuitionistic provability. We propose another operational semantics for $fohh$ which is based ... More

Interactive Logic Programming via Choice-Disjunctive ClausesJul 29 2013Jul 12 2015Adding interaction to logic programming is an essential task. Expressive logics such as linear logic provide a theoretical basis for such a mechanism. Unfortunately, none of the existing linear logic languages can model interactions with the user. This ... More

Topological spin transport by Brownian diffusion of domain wallsJul 31 2015Dec 16 2015We propose thermally-populated domain walls (DWs) in an easy-plane ferromagnetic insulator as robust spin carriers between two metals. The chirality of a DW, which serves as a topological charge, couples to the metal spin accumulation via spin-transfer ... More

Propulsion of a domain wall in an antiferromagnet by magnonsJun 23 2014We analyze the dynamics of a domain wall in an easy-axis antiferromagnet driven by circularly polarized magnons. Magnons pass through a stationary domain wall without reflection and thus exert no force on it. However, they reverse their spin upon transmission, ... More

Mechanical Actuation of Magnetic Domain-Wall MotionJun 17 2016Nov 02 2016We theoretically study the motion of a magnetic domain wall induced by transverse elastic waves in a one-dimensional magnetic wire, which respects both rotational and translational symmetries. By invoking the conservation of the associated total angular ... More

Topological spin-transfer drag driven by skyrmion diffusionMay 10 2016Jul 22 2016We study the spin-transfer drag mediated by the Brownian motion of skyrmions. The essential idea is illustrated in a two-terminal geometry, in which a thin film of a magnetic insulator is placed in between two metallic reservoirs. An electric current ... More

Gauge fields and related forces in antiferromagnetic solitonsJan 18 2017We derive equations of motion for topological solitons in antiferromagnets under the combined action of perturbations such as an external magnetic field and torque-generating electrical current. Aside from conservative forces, such perturbations generate ... More

Magnetic Domain Wall Floating on a Spin SuperfluidAug 02 2016We theoretically investigate the transfer of angular momentum between a spin superfluid and a domain wall in an exchange coupled easy-axis and easy-plane magnetic insulator system. A domain wall in the easy-axis magnet absorbs spin angular momentum via ... More

Thermophoresis of an Antiferromagnetic SolitonMar 26 2015Jul 08 2015We study dynamics of an antiferromagnetic soliton under a temperature gradient. To this end, we start by phenomenologically constructing the stochastic Landau-Lifshitz-Gilbert equation for an antiferromagnet with the aid of the fluctuation-dissipation ... More

Majorana Fermion Rides on a Magnetic Domain WallFeb 07 2015We propose using a mobile magnetic domain wall as a host of zero-energy Majorana fermions in a spin-orbit coupled nanowire sandwiched by two ferromagnetic strips and deposited on an $s$-wave superconductor. The ability to control domain walls by thermal ... More

Topological Transport of Vorticity in Heisenberg MagnetsOct 24 2018May 09 2019We study a robust topological transport carried by vortices in a thin film of an easy-plane ferromagnetic insulator between two metal contacts. A vortex, which is a nonlocal topological spin texture in two-dimensional magnets, exhibits some beneficial ... More

Stabilization of the skyrmion crystal phase in thin-film antiferromagnetsJun 17 2018We investigate the formation and stability of the skyrmion crystal phase in antiferromagnetic thin films subjected to fieldlike torques such as, e.g., those induced by an electric current in CuMnAs and Mn$_{2}$Au via the inverse spin-galvanic effect. ... More

Atomic and electronic structure of the $\sqrt{3}$$\times$$\sqrt{3}$ silicene phase on Ag(111): density-functional calculationsFeb 26 2016Density-functional theory calculations are used to verify the atomic structure of the $\sqrt{3}$$\times$$\sqrt{3}$ silicene phase grown on the Ag(111) surface. Recent experimental studies strongly suggested that the previous double-layer silicene model ... More

Study on the microwave ion source of 100-MeV proton linacJun 14 2016A microwave ion source is used as an ion source of 100-MeV proton accelerator at Korea Multipurpose Accelerator Complex (KOMAC). The specifications of the ion source are 50 keV in energy and 20 mA in peak current. The plasma is operated in CW mode using ... More

A Passage to Topological Matter: ColloquiumSep 21 2018Topological matter has become one of the most important subjects in contemporary condensed matter physics. Here, I would like to provide a pedagogical review explaining some of the main ideas, which were pivotal in establishing topological matter as such ... More

On embeddings of the Grassmannian $Gr(2,m)$ into the Grassmannian $Gr(2,n)$Sep 22 2016Feb 15 2017In this {paper}, we consider holomorphic embeddings of $Gr(2,m)$ into $Gr(2,n)$. We study such embeddings by finding all possible total Chern classes of the pull-back of the universal bundles under these embeddings. Using the relations between Chern classes ... More

Combinatorial Auslander-Reiten quivers and reduced expressionsSep 16 2015In this paper, we introduce the notion of combinatorial Auslander-Reiten (AR) quivers. Combinatorial AR quivers can be understood as a generalization of AR quivers and each combinatorial AR quiver realizes a convex partial order on a set of positive roots ... More

Topologically slice knots of smooth concordance order twoDec 29 2012May 14 2014The existence of topologically slice knots that are of infinite order in the knot concordance group followed from Freedman's work on topological surgery and Donaldson's gauge theoretic approach to 4-manifolds. Here, as an application of Ozsvath and Szabo's ... More

Complex Contagions with TimersJun 13 2017A great deal of effort has gone into trying to model social influence --- including the spread of behavior, norms, and ideas --- on networks. Most models of social influence tend to assume that individuals react to changes in the states of their neighbors ... More

A universal bound on the variations of bounded convex functionsJan 09 2014Mar 17 2015Given a convex set $C$ in a real vector space $E$ and two points $x,y\in C$, we investivate which are the possible values for the variation $f(y)-f(x)$, where $f:C\longrightarrow [m,M]$ is a bounded convex function. We then rewrite the bounds in terms ... More

Mutual information change in feedback processes driven by measurementAug 16 2016Sep 09 2016We investigate thermodynamics of feedback processes driven by measurement. Regarding system and memory device as a composite system, mutual information as a measure of correlation between the two constituents contributes to the entropy of the composite ... More

Path-dependent Entropy ProductionAug 06 2015A rigorous derivation of nonequilibrium entropy production via the path-integral formalism is presented. Entropy production is defined as the entropy change piled in a heat reservoir as a result of a nonequilibrium thermodynamic process. It is a central ... More

Catalan triangle numbers and binomial coefficientsJan 25 2016We prove that any binomial coefficient can be written as weighted sums along rows of the Catalan triangle. The coefficients in the sums form a triangular array, which we call the {\em alternating Jacobsthal triangle}. We study various subsequences of ... More

CSMA using the Bethe Approximation: Scheduling and Utility MaximizationJun 05 2013Jan 15 2015CSMA (Carrier Sense Multiple Access), which resolves contentions over wireless networks in a fully distributed fashion, has recently gained a lot of attentions since it has been proved that appropriate control of CSMA parameters guarantees optimality ... More

Medium Access over Time-varying Channels with Limited Sensing CostJun 22 2012Dec 17 2012This paper has been withdrawn because of some paper issues. Recent studies on MAC scheduling have shown that carrier sense multiple access (CSMA) can be controlled to be achieve optimality in terms of throughput or utility. These results imply that just ... More

Monoidal categories of modules over quantum affine algebras of type A and BOct 18 2017We construct an exact tensor functor from the category $\mathcal{A}$ of finite-dimensional graded modules over the quiver Hecke algebra of type $A_\infty$ to the category $\mathscr C_{B^{(1)}_n}$ of finite-dimensional integrable modules over the quantum ... More

"Invisible" QCD axion rolling through the QCD phase transitionApr 14 2018Jul 16 2018Visible matter in the current Universe is a consequence of the phase transition of the strong force, quantum chromodynamics (QCD). This phase transition has occurred at the Universe temperature around $T_c\simeq 165\,$MeV while it was expanding. Strongly ... More

Crossed products of operator systemsMar 28 2018Dec 04 2018In this paper we introduce the crossed product construction for a discrete group action on an operator system. In analogy to the work of E. Katsoulis and C. Ramsey, we describe three canonical crossed products arising from such a dynamical system. We ... More

Accelerating the Kamada-Kawai algorithm for boundary detection in a mobile ad hoc networkAug 21 2015Force-directed algorithms such as the Kamada-Kawai algorithm have shown promising results for solving the boundary detection problem in a mobile ad hoc network. However, the classical Kamada-Kawai algorithm does not scale well when it is used in networks ... More

TRAO Survey of Nearby Filamentary Molecular clouds, the Universal Nursery of Stars (TRAO FUNS) I. Dynamics and Chemistry of L1478 in the California Molecular CloudApr 24 2019"TRAO FUNS" is a project to survey Gould Belt's clouds in molecular lines. This paper presents its first results on the central region of the California molecular cloud, L1478. We performed On-The-Fly mapping observations using the Taedeok Radio Astronomy ... More

Giant thermal hysteresis in Verwey transition of single domain Fe3O4 nanoparticlesMar 15 2018Most interesting phenomena of condensed matter physics originate from interactions among different degrees of freedom, making it a very intriguing yet challenging question how certain ground states emerge from only a limited number of atoms in assembly. ... More

A Mazur-Ulam theorem for Mappings of conservative distance in non-Archimedean $n$-normed spacesDec 10 2009In this article, we study the notions of $n$-isometries in non-Archimedean $n$-normed spaces over linear ordered non-Archimedean fields, and prove the Mazur-Ulam theorem in the spaces. Furthermore, we obtain some properties for $n$-isometries in non-Archimedean ... More

Kondo-like behaviors in magnetic and thermal properties of single crystal Tm5Si2Ge2Nov 30 2009We grew the single crystal of stoichiometric Tm5Si2.0Ge2.0 using a Bridgeman method and performed XRD, EDS, magnetization, ac and dc magnetic susceptibilities, specific heat, electrical resistivity and XPS experiments. It crystallizes in orthorhombic ... More

Electronic Structure Studies of Detwinned BaFe$_2$As$_2$ by PhotoemissionNov 04 2010Jan 11 2011We performed angle resolved photoelectron spectroscopy (ARPES) studies on mechanically detwinned BaFe2As2. We observe clear band dispersions and the shapes and characters of the Fermi surfaces are identified. Shapes of the two hole pockets around the ... More

Gyrotropic elastic response of skyrmion crystals to current-induced tensionsFeb 10 2017Jul 08 2017We theoretically study the dynamics of skyrmion crystals in electrically-insulating chiral magnets subjected to current-induced spin torques by adjacent metallic layers. We develop an elasticity theory that accounts for the gyrotropic force engendered ... More

Bidirectional spin-wave-driven domain wall motion in antiferromagnetically coupled ferrimagnetsMay 09 2019We investigate ferrimagnetic domain wall dynamics induced by circularly polarized spin waves theoretically and numerically. We find that the direction of domain wall motion depends on both the circular polarization of spin waves and the sign of net spin ... More

Indicator fractional stable motionsOct 15 2010Mar 05 2011Using the framework of random walks in random scenery, Cohen and Samorodnitsky (2006) introduced a family of symmetric $\alpha$-stable motions called local time fractional stable motions. When $\alpha=2$, these processes are precisely fractional Brownian ... More

Perturbations of the Symmetric Exclusion ProcessSep 15 2003Feb 27 2004For the exclusion process with symmetric kernel p(x,y)=p(y,x), the set of invariant measures has been completely studied. This paper gives results concerning the invariant measures for exclusion processes where p(x,y)=p(y,x) except for finitely many (x,y). ... More

Universality of Composition Operators and Applications to Holomorphic DynamicsMar 03 2016By investigating which level of universality composition operators $C_f$ can have, where the symbol $f$ is given by the restriction of a transcendental entire function to suitable parts of the Fatou set of $f$, this work combines the theory of dynamics ... More

The Electron EDM and EDMs in Two-Higgs-Doublet ModelsMay 25 2014Electric dipole moments constitute highly sensitive probes for CP-violating effects beyond the Standard Model. The upper limits obtained in various precision experiments can therefore be used to strongly restrict new physics models. However, relating ... More

Non-universal Z' models with protected flavour-changing interactionsJun 29 2016We define a new class of Z' models with neutral flavour-changing interactions at tree level in the down-quark sector. They are related in an exact way to elements of the quark mixing matrix due to an underlying flavoured U(1)' gauge symmetry, rendering ... More

Determining weak phases from B->J/Psi P decaysJun 10 2012Aug 10 2012The decay B -> J/Psi K_S remains the most important source of information for the B_d mixing phase, determined by the CKM angle beta in the standard model. When aiming at a precision appropriate for present and coming high luminosity colliders, the corresponding ... More

Recent topics in CP violationAug 06 2012Dec 06 2012Recent topics regarding CP violation in heavy meson systems are discussed. As an introduction, the status of the Unitarity Triangle fit and CP violation in B meson mixing are briefly reviewed. Two topics are covered in more detail: Penguin pollution in ... More

Magnonic topological insulators in antiferromagnetsJul 24 2017Nov 28 2017Extending the notion of symmetry protected topological phases to insulating antiferromagnets (AFs) described in terms of opposite magnetic dipole moments associated with the magnetic N$\acute{{\rm{e}}} $el order, we establish a bosonic counterpart of ... More