Hexagonal Image Processing in the Context of Machine Learning: Conception of a Biologically Inspired Hexagonal Deep Learning Framework. (arXiv:1911.11251v1 [cs.LG])

Inspired by the human visual perception system, hexagonal image processing in the context of machine learning deals with the development of image processing systems that combine the advantages of evolutionary motivated structures based on biological models. While conventional state of the art image processing systems of recording and output devices almost exclusively utilize square arranged…

State-Space Based Network Topology Identification. (arXiv:1911.11270v1 [eess.SP])

In this work, we explore the state-space formulation of network processes to recover the underlying structure of the network (local connections). To do so, we employ subspace techniques borrowed from system identification literature and extend them to the network topology inference problem. This approach provides a unified view of the traditional network control theory and…

Enabling In-Band Coexistence of Millimeter-Wave Communication and Radar. (arXiv:1911.11283v1 [eess.SP])

The wide bandwidths available at millimeter-wave (mmWave) frequencies have offered exciting potential to wireless communication systems and radar alike. Communication systems can offer higher rates and support more users with mmWave bands while radar systems can benefit from higher resolution captures. This leads to the possibility that portions of mmWave spectrum will be occupied by…

Progressive Retinex: Mutually Reinforced Illumination-Noise Perception Network for Low Light Image Enhancement. (arXiv:1911.11323v1 [eess.IV])

Contrast enhancement and noise removal are coupled problems for low-light image enhancement. The existing Retinex based methods do not take the coupling relation into consideration, resulting in under or over-smoothing of the enhanced images. To address this issue, this paper presents a novel progressive Retinex framework, in which illumination and noise of low-light image are…

Disagreement and Polarization in Two-Party Social Networks. (arXiv:1911.11338v1 [cs.SI])

We investigate disagreement and polarization in a social network with two polarizing sources of information. First, we define disagreement and polarization indices in two-party leader-follower models of opinion dynamics. We then give expressions for the indices in terms of a graph Laplacian. The expressions show a relationship between these quantities and the concepts of resistance…

Controlled edge dependent stacking of WS2-WS2 Homo- and WS2-WSe2 Hetero-structures: A Computational Study. (arXiv:1911.11289v1 [physics.chem-ph])

Transition Metal Dichalcogenides (TMDs) are one of the most studied two-dimensional materials in the last 5-10 years due to their extremely interesting layer dependent properties. Despite the presence of vast research work on TMDs, the complex relationship between the electrochemical and physical properties make them the subject of further research. Our main objective is to…

Mapping Skyrmion Stability in Uniaxial Lacunar Spinel Magnets from First-Principles. (arXiv:1911.11297v1 [cond-mat.mtrl-sci])

The identification of general principles for stabilizing magnetic skyrmion phases in bulk materials over wide ranges of temperatures is a prerequisite to the development of skyrmion-based spintronic devices. Lacunar spinels with the formula GaM4X8 with M=V, Mo; X=S, Se are a convenient case study towards this goal as they are some of the first bulk…

Ion-acoustic rogue waves in a multi-component plasma medium. (arXiv:1911.11299v1 [physics.plasm-ph])

The nonlinear propagation of ion-acoustic (IA) waves (IAWs) in a four component plasma medium (FCPM) containing inertial warm positive ions, and inertialess iso-thermal cold electrons as well as non-extensive ($q$-distributed) hot electrons and positrons is theoretically investigated. A nonlinear Schr\”{o}dinger equation (NLSE) is derived by using the reductive perturbation method, and it is observed that…

Factorization of high-harmonic generation yields in impurity-doped materials. (arXiv:1911.11300v1 [physics.optics])

We present a theoretical investigation of high-harmonic generation (HHG) from impurity-doped materials using the time-dependent Schr\”odinger equation (TDSE) approach. We demonstrate the factorization of HHG yields as a product of an electron wave packet and the recombination cross section, in analogy to HHG from atoms and molecules in the gas phase. Furthermore, we show that…

Higher-order topological insulators in synthetic dimensions. (arXiv:1911.11310v1 [cond-mat.mes-hall])

Conventional topological insulators support boundary states that have one dimension lower than the bulk system that hosts them, and these states are topologically protected due to quantized bulk dipole moments. Recently, higher-order topological insulators have been proposed as a way of realizing topological states that are two or more dimensions lower than the bulk, due…