In this paper, we propose a discriminative rep- resentation of a video shot based on its camera motion and demonstrate how the representation can be used for high level multimedia tasks like complex event recognition. In our tech- nique, we assume that a homography exists between a pair of subsequent frames in a given shot. Using purely image-based methods, ...

Journal: IEEE Transactions on Multimedia - TMM, vol. 16, no. 3, 2014]]>A fractal is a geometrical structure that is self-similar when scaled. By assessing the fractal dimension of asset returns, the retail investors with recent innovation in financial prediction and computational power, can exploit these prices. A branch of a tree is often used as an example in Fractal. The branch is similar to the whole tree and if we ...

Published in 2013]]>We show how a Hopfield network with modifiable recurrent connections undergoing slow Hebbian learning can extract the underlying geometry of an input space. First, we use a slow and fast analysis to derive an averaged system whose dynamics derives from an energy function and therefore always converges to equilibrium points. The equilibria reflect the correlation structure of the inputs, a ...

Journal: Neural Computation - NECO, vol. 24, no. 9, pp. 2346-2383, 2012]]>A great number of works focus their interest on the study of gold nanoparticle plasmonic properties. Among those, sharp nanostructures appear to exhibit the more interesting features for further developments. In this paper, a complete study on bipyramidal-like gold nanostructures is presented. The nano-objects are prepared in high yield using an original method. This chemical process enables a ...

Journal: Nanotechnology - NANOTECHNOL, vol. 23, no. 14, 2012]]>Social media networks contain both content and context-specific information. Most existing methods work with either of the two for the purpose of multimedia mining and retrieval. In reality, both content and context information are rich sources of information for mining, and the full power of mining and processing algorithms can be realized only with the use of a combination ...

Journal: IEEE Transactions on Pattern Analysis and Machine Intelligence - PAMI, vol. 34, no. 5, pp. 850-862, 2012]]>The present paper deals with the application of atomic force microscopy (AFM) as a tool for morphological characterization of histological brain tumor samples. Data mining techniques will be applied for automatic identification of brain tumor tissues based on AFM images by means of classifying grade II and IV tumors. The rapid advancement of AFM in recent years turned it into ...

Conference: Symposium on Computational Intelligence in Bioinformatics and Computational Biology - CIBCB, 2012]]>In this article, we present the system development of Virtual EMC Lab (“Virtual Electromagnetic Compatibility Laboratory”). It is a toolkit developed for the electronic and electric product/system design, modelling, simulation, analysis, diagnosis and assessment tailored to the electromagnetic compatibility problems. The toolkit includes a solid modelling front-end which simplifies the geometrical structure of equipment under test (EUT), analytical ...

Conference: International Zurich Symposium on Electromagnetic Compatibility - EMC Zurich, 2012]]>We present a simple and pedagogical derivation of the quantum adiabatic theorem for two-level systems (a single qubit) based on geometrical structures of quantum mechanics developed by Anandan and Aharonov, among others. We have chosen to use only the minimum geometric structure needed for the understanding of the adiabatic theorem for this case.

Journal: European Journal of Physics - EUR J PHYS, vol. 33, no. 5, pp. 1063-1072, 2012]]>Published in 2012]]>

FePt nanoparticles of uniform sizes, compositions, and crystal structures can be obtained by chemical synthesis. Additionally, the nanoparticles can be well dispersed by the adsorption of a surfactant on the nanoparticle surface. Previously, the immobilization of FePt nanoparticles on a thermal oxide Si substrate was carried out by chemical synthesis, utilizing the Pt-S bonding between the -SH functional group ...

Journal: Journal of Magnetism and Magnetic Materials - J MAGN MAGN MATER, vol. 324, pp. 303-308, 2012]]>This paper presents a new method for stereoscopic 3D video generation from single 2D video. One of the stereo pair is taken as the 2D frame itself, and the other one is obtained by shifting it horizontally according to the disparity map. Disparity map is obtained from motion between frames and the geometrical structure of the scene. The disparity difference ...

Conference: IEEE Signal Processing and Communications Applications - SIU, 2012]]>In the same vein as the genome project that mapped the genetic structure of complex organisms such as the mouse, those pursuing the neurome are seeking a map the neural anatomy. In this massive biological investigation, the tools of imaging and biological experimentation are outpacing the requisite tools in image analysis. In terms of comparing neurons, based on the geometrical ...

Conference: IEEE International Symposium on Biomedical Imaging, pp. 772-775, 2012]]>The magnetic induction (MI)-based wireless underground sensor networks (WUSNs) use the novel MI waveguide technique to establish long range and low cost wireless communications in harsh underground environments, which enable a large variety of novel and important applications. One of the main research challenges is the theoretical study of the channel and network capacities in these networks. Compared to ...

Conference: IEEE INFOCOM - INFOCOM, pp. 370-378, 2012]]>First-principles plane-wave pseudopotential calculations are performed to study the geometrical structures, formation energies, and electronic and optical properties of Y-doped, N-doped, and (Y, N)-codoped TiO2. The calculated results show that Y and N codoping leads to lattice distortion, easier separation of photogenerated electron-hole pairs and band gap narrowing. The optical absorption spectra indicate that ...

Journal: Chinese Physics B - CHIN PHYS B, vol. 21, no. 3, 2012]]>The base space of a semi-universal unfolding of a hypersurface singularity carries a rich geometric structure, which was axiomatized as a CDV-structure by C. Hertling. For any CDV-structure on a Frobenius manifold M, the pull-back bundle pi*TM(1,0) by the projection pi:C×M-->M carries two natural holomorphic structures equipped with two flat ...

Journal: Journal of Geometry and Physics - J GEOM PHYSICS, vol. 62, pp. 37-46, 2012]]>One of the challenges with functional data is incorporating geometric structure, or local correlation, into the analysis. This structure is inherent in the output from an increasing number of biomedical technologies, and a functional linear model is often used to estimate the relationship between the predictor functions and scalar responses. Common approaches to the problem of estimating a coefficient function ...

Journal: Electronic Journal of Statistics, no. 2012, pp. 323-353, 2012]]>The minimum aberration criterion has been frequently used in the selection of fractional factorial designs with nominal factors. For designs with quantitative factors, however, level permutation of factors could alter their geometrical structures and statistical properties. In this paper uniformity is used to further distinguish fractional factorial designs, besides the minimum aberration criterion. We show that minimum aberration designs have ...

Journal: Annals of Statistics - ANN STATIST, vol. 40, no. 2012, pp. 891-907, 2012]]>The geometric structure of the null solutions of de Sitter D = 5 gauged supergravity coupled to vector multiplets is investigated. These solutions are Kundt metrics, constructed from a one-parameter family of three-dimensional Gauduchon–Tod base spaces. We give examples, including the near-horizon geometries previously found in Gutowski and Sabra (2011 J. High Energy Phys. JHEP05(2011)020). ...

Journal: Classical and Quantum Gravity - CLASS QUANTUM GRAVITY, vol. 29, no. 10, 2012]]>The geometrical structure of the Indian elephant bell is presented and the requirements on its normal modes from group representation theory are described. These are in good agreement with the results of a finiteelement model (FEM) for a specific 16-tine case. The spectrum consists of a sequence of families of modes lying on saturation curves and so is completely ...

Published in 2012]]>Recently, ranking data with respect to the intrinsic geometric structure (manifold ranking) has received considerable attentions, with encouraging performance in many applications in pattern recognition, information retrieval and recommendation systems. Most of the existing manifold ranking methods focus on learning a ranking function that varies smoothly along the data manifold. However, beyond smoothness, a desirable ranking function should vary monotonically ...

Published in 2012]]>We recognize a discrepancy in magnitudes estimated for several Basin and Range, U.S.A. faults. For example, magnitudes predicted for the Wasatch (Utah), Lost River (Idaho), and Lemhi (Idaho) faults from fault segment lengths (L{sub seg}) where lengths are defined between geometrical, structural, and/or behavioral discontinuities assumed to persistently arrest rupture, are consistently less than magnitudes calculated ...

Journal: Seismological Research Letters - SEISMOL RES LETT, vol. 83, no. 3, 2012]]>This paper presents a new spectral clustering method called correlation preserving indexing (CPI), which is performed in the correlation similarity measure space. In this framework, the documents are projected into a low-dimensional semantic space in which the correlations between the documents in the local patches are maximized while the correlations between the documents outside these patches are minimized simultaneously. ...

Journal: IEEE Transactions on Knowledge and Data Engineering - TKDE, vol. 24, no. 6, pp. 1002-1013, 2012]]>Since the onset of wireless sensor networks, target localization and tracking have received much attention in a wide range of applications including battle field surveillance, wildlife monitoring and border security. However, little work has been done that addresses the realistic considerations of uncertainties in sensor locations and evaluates their impacts on the accuracy of target localization and tracking. In this ...

Conference: IEEE INFOCOM - INFOCOM, pp. 1835-1843, 2012]]>Until now, neighbor-embedding-based (NE) algorithms for super-resolution (SR) have carried out two independent processes to synthesize high-resolution (HR) image patches. In the first process, neighbor search is performed using the Euclidean distance metric, and in the second process, the optimal weights are determined by solving a constrained least squares problem. However, the separate processes are not ...

Journal: IEEE Transactions on Image Processing, vol. 21, no. 7, pp. 3194-3205, 2012]]>In this paper, we present a new algorithm for learning oblique decision trees. Most of the current decision tree algorithms rely on impurity measures to assess the goodness of hyperplanes at each node while learning a decision tree in top-down fashion. These impurity measures do not properly capture the geometric structures in the data. Motivated by this, our algorithm ...

Journal: IEEE Transactions on Systems, Man, and Cybernetics - TSMC, vol. 42, no. 1, pp. 181-192, 2012]]>The geometrical structures, relative stabilities, electronic and magnetic properties of small BnAl− (2 ≤ n ≤ 9) clusters are systematically investigated by using the first-principles density functional theory. The results show that the Al atom prefers to reside either on the outer-side or above the surface, but not in the centre of the clusters in all of the ...

Journal: Chinese Physics B - CHIN PHYS B, vol. 21, no. 4, 2012]]>The topic of this study is electromagnetic environment and electromagnetic interferences (EMI) effects, specifically the modelling of lightning indirect effects [1] on aircraft electrical systems present on deported and highly exposed equipments, such as nose landing gear (NLG) and nacelle, through a circuit approach. The main goal of the presented work, funded by a French national project: PREFACE, is to ...

Published in 2012]]>We have studied the property of single-walled ZnO nanotubes with adsorbed water molecules, and theoretically designed a new sensor for detecting water molecules using single-walled ZnO nanotubes using a combination of density functional theory and the non-equilibrium Green's function method. Details of the geometric structures and adsorption energies of the H2O molecules on the ZnO nanotube ...

Journal: Communications in Theoretical Physics - COMMUN THEOR PHYS, vol. 58, no. 2, pp. 275-279, 2012]]>We propose Laplacian Eigenmaps (LE)-based ap- proaches to automatic story segmentation on speech recognition transcripts of broadcast news. We reinforce story boundaries by applying LE analysis to sentence connective strength matrix and reveal the intrinsic geometric structure of stories. Specifically, we construct a Euclidean space in which each sentence is mapped to a vector. As a result, the original ...

Journal: IEEE Transactions on Audio, Speech & Language Processing - TASLP, vol. 20, no. 1, pp. 264-277, 2012]]>As a newly developed 2-D extension of the wavelet transform using multiscale and directional filter banks, the contourlet transform can effectively capture the intrinsic geometric structures and smooth contours of a texture image that are the dominant features for texture classification. In this paper, we propose a novel Bayesian texture classifier based on the adaptive model-selection learning of ...

Journal: IEEE Transactions on Image Processing, vol. 21, no. 3, pp. 909-918, 2012]]>The lateral resolution (LR) and signal-to-noise ratio (SNR) are the essential factors in the applications of scanning probe microscopy in quantitative measurement of surface charge distribution, potential profile, and dielectric properties. We use a model system to comprise Au nanoparticles (NPs) embedded in a polystyrene (PS) matrix to study the effects of various experimental parameters, such as modulation ...

Journal: Chinese Physics Letters - CHIN PHYS LETT, vol. 29, no. 7, 2012]]>The requirements for the size and performance of fabric 3D five-directional braided variable cross-sectional tube can be met by using the appropriate reducing-yarn technique. Compared with the fabric processed with invariable cross-sectional yarns, the theoretical model of geometric structure and properties of variable cross-sectional yarn fabric is more complex. Based on the constituting method of ...

Journal: Journal of Composite Materials - J COMPOS MATER, vol. 46, no. 14, pp. 1697-1704, 2012]]>In many information processing tasks, labels are usually expensive and the unlabeled data points are abundant. To reduce the cost on collecting labels, it is crucial to predict which unlabeled examples are the most informative, i.e., improve the classifier the most if they were labeled. Many active learning techniques have been proposed for text categorization, such as {\rm SVM}_{...

Journal: IEEE Transactions on Knowledge and Data Engineering - TKDE, vol. 24, no. 4, pp. 707-719, 2012]]>In many real-world applications, the same object may have different observations (or descriptions) from multiview observation spaces, which are highly related but sometimes look different from each other. Conventional metric-learning methods achieve satisfactory performance on distance metric computation of data in a single-view observation space, but fail to handle well data sampled from multiview observation spaces, especially ...

Published in 2012]]>In this paper, discriminant linear local tangent space alignment (MDLLTSA) is proposed in order to solve the problems of local tangent space alignment (LTSA) in image recognition, such as implicitness of the nonlinear map or class information of data is ignored. With local tangent space representing for local geometrical structure of the manifold of the data samples, as well as ...

Conference: International Conference on Intelligent System Design and Engineering Application - ISDEA, 2012]]>Silicene-like (4,0) zigzag metal-doped MSi nanotubes are investigated by first-principles calculations. We show that the geometrical structures of silicon nanotubes can be stabilized by doping metal (K, Ca, Y and Lu). Electronic structure calculations show that Y and Lu atoms gain extra charge from Si atoms, the bonding between Si and the MSi (M = K, Ca) ...

Journal: Computer Physics Communications, vol. 183, pp. 30-33, 2012]]>We investigate the adsorptions of Ar on Al (111) and Ir (111) surfaces at the four high symmetry sites, i.e., top, bridge, fcc- and hcp-hollow sites at the coverage of 0.25 monolayer (ML) using the density functional theory within the generalized gradient approximation of Perdew, Burke and Ernzerhof functions. The geometric structures, the binding energies, the electronic ...

Journal: Chinese Physics B - CHIN PHYS B, vol. 21, no. 2, 2012]]>Using the meta-generalized gradient approximation (meta-GGA) exchange correlation TPSS functional, the geometric structures, the relative stabilities, and the electronic properties of bimetallic AgnX (X=Au, Cu; n=1−8) clusters are systematically investigated and compared with those of pure silver clusters. The optimized structures show that the transition point from preferentially planar to three-dimensional structure occurs at n = ...

Journal: Chinese Physics B - CHIN PHYS B, vol. 21, no. 4, 2012]]>We study the class of weakly locally modular geometric theories introduced in [4], a common generalization of the classes of linear SU-rank 1 and linear o-minimal theories. We find new conditions equivalent to weak local modularity: “weak one-basedness”, absence of type definable “almost quasidesigns”, and “generic linearity”. Among other things, we show that weak one-basedness is ...

Journal: Journal of Symbolic Logic - JSYML, vol. 77, no. 2012, pp. 392-422, 2012]]>In this article we get a result on propagation of geometric properties for solutions of the non-homogeneous incompressible Euler system in any dimension N ≥ 2. In particular, we investigate conservation of striated and conormal regularity, which generalize the 2-D structure of vortex patches. The results we get are only local in time, even for N = 2; however, we provide ...

Journal: Communications in Partial Differential Equations - COMMUN PART DIFF EQUAT, vol. just-accep, no. just-accep, 2012]]>Multidimensional channel sounding aims to estimate the geometrical structure of multi-path wave propagation in terms of directions of arrival/departure, Doppler shift, time delay, and complex polarimetric path weights. Maximum likelihood parameter estimation based upon an underlying data model is used to achieve high-resolution of the path parameters and, thus, renders possible an antenna independent channel characterization. However, ...

Journal: IEEE Transactions on Antennas and Propagation - IEEE TRANS ANTENNAS PROPAGAT, vol. 60, no. 2, pp. 557-573, 2012]]>Using density function theory (DFT), the Cu-doped Aln (n=1−15) clusters have been studied. The electron affinity, ionization potential, Mulliken population analysis of Cu, mean polarizability, polarizability anisotropy, dipole moments and HOMO-LUMO gaps have also been calculated on the basis of optimized geometries. The results indicate that there are magic numbers in copper-doped aluminum clusters and the ...

Journal: Chinese Journal of Chemical Physics - CHIN J CHEM PHYS, vol. 25, no. 2, pp. 169-176, 2012]]>Computer simulation of electromagnetic field problems has become a key tool in dealing with EMC problems. In particular time domain algorithms are best suited, as they are able to deliver broad band results by their very nature in an easy way. There are several time domain approaches such as FDTD[1], TLM[2] and FIT[3,4] that are commonly ...

Published in 2012]]>In action recognition, bag of visual words based approaches have been shown to be successful, for which the quality of codebook is critical. In a large vocabulary of poses (visual words), some key poses play a more decisive role than others in the codebook. This paper proposes a novel approach for key poses selection, which models the descriptor space utilizing ...

Journal: IEEE Transactions on Industrial Informatics, vol. 8, no. 1, pp. 168-177, 2012]]>The geometrical structures, relative stabilities, and electronic properties of pure and Cs2-doped gold clusters have been determined by employing the density functional method with the relativistic effective core potential. The results show that doping with two Cs atoms dramatically affects the geometries of the ground-state pure gold clusters and the doped Cs atoms prefer to locate at the ...

Journal: Molecular Physics - MOL PHYS, vol. ahead-of-p, no. ahead-of-p, pp. 1-11, 2012]]>The density functional method with the relativistic effective core potential has been employed to investigate systematically the geometric structures, relative stabilities, growth-pattern behavior, and electronic properties of small bimetallic AunRb (n = 1–10) and pure gold Aun (n ≤ 11) clusters. For the geometric structures of the AunRb (n = 1–10) clusters, the dominant growth pattern is for a Rb-substituted ...

Journal: Molecular Physics - MOL PHYS, vol. 110, no. 2, pp. 95-111, 2012]]>Geometric structures of surfaces are formulated based on Caputo fractional derivatives. The Gauss frame of a surface with fractional order is introduced. Then, the non-locality of the fractional derivative characterizes the asymmetric second fundamental form. The mean and Gaussian curvatures of the surface are defined in the case of fractional order. Based on the fractional curvatures, incompressible two-dimensional ...

Journal: Journal of Physics A-mathematical and Theoretical - J PHYS A-MATH THEOR, vol. 45, no. 6, 2012]]>The nonlinear dynamics of curved ionic polymer–metal composite (IPMC) actuators having large tip displacement and periodical jumping locomotion was investigated experimentally. Through snap-through phenomena, the actuator generates much larger tip displacement and shows abrupt jumps in the transitions of upswings and downswings with low input energy. Two curved IPMC cantilever actuators having two different constant curvatures of 0....

Journal: International Journal of Smart and Nano Materials, vol. ahead-of-p, no. ahead-of-p, pp. 1-12, 2012]]>We present here the results of our density-functional-theory-based calculations of the electronic and geometric structures and energetics of Se and O adsorption on Ru 93- and 105-atom nanoparticles. These studies have been inspired by the fact that Se/Ru nanoparticles are considered promising electrocatalysts for the oxygen reduction reaction (ORR) on direct methanol fuel cell cathodes ...

Journal: Journal of Physics-condensed Matter - J PHYS-CONDENS MATTER, vol. 24, no. 34, 2012]]>By embedding a nanocavity adjacent to one or both of slits in a subwavelength double-slit structure, frequency selective propagation through the slits is demonstrated. When the incident light wavelength corresponds to the cavity resonance mode, the electromagnetic wave passing through the slit will be trapped within the nanocavity. Therefore, the double slit operates as a single slit and light ...

Journal: Chinese Physics Letters - CHIN PHYS LETT, vol. 29, no. 4, 2012]]>The geometrical structures, relative stabilities, HOMO–LUMO energy gaps, natural charges and magnetic moments of (n = 1–8) clusters have been investigated at the B3PW91 level. The results indicate that the most stable (n = 1–8) clusters adopt a planar structure for even n and a 3D structure for odd n, with the exception of . Note further that one impurity ...

Journal: Molecular Physics - MOL PHYS, vol. ahead-of-p, no. ahead-of-p, pp. 1-8, 2012]]>In low-energy electron diffraction (LEED) studies of surface geometries where the energy dependence of the intensities is analyzed, the in-plane lattice parameter of the surface is usually set to a value determined by x-ray diffraction for the bulk crystal. In cases where it is not known, for instance in films that are incommensurate with the substrate, it ...

Journal: Journal of Physics-condensed Matter - J PHYS-CONDENS MATTER, vol. 24, no. 1, 2012]]>In this work, the time-dependent density functional theory (TDDFT) method was carried out to study the hydrogen-bonding dynamics in both singlet and triplet excited states of trans-acetanilide (AA)–(H2O) complexes formed by trans-acetanilide in a water (H2O) solvent. The ground-state geometric structure optimisations were calculated by the density functional theory method, but the electronic excitation ...

Journal: Molecular Simulation - MOL SIMULAT, vol. 38, no. 1, pp. 57-65, 2012]]>Increased availability of large repositories of chemical compounds has created new challenges and opportunities for the application of data-mining and indexing techniques to problems in chemical informatics. The primary goal in analysis of molecular databases is to identify structural patterns that can predict biological activity. Two of the most popular approaches to representing molecular topologies are graphs and 3D ...

Published in 2012]]>Under the framework of density functional theory, an all-electron calculation on the geometrical structures and dissociation channels of Ti/P binary cluster ions has been carried out. The P2, P3 and P4 structures are found to be the relatively stable units in these cluster ions. The lowest energy geometries of these Ti/P binary cluster ions may be constructed ...

Journal: Molecular Simulation - MOL SIMULAT, vol. 38, no. 2, pp. 102-111, 2012]]>Electronic structure methods, especially density functional theory (DFT) and time-dependent DFT, have found significant applications in understanding the structure and properties of nanoparticles. In this review, recent studies of the geometric and electronic structure, optical absorption, circular dichroism, growth mechanisms, ligand exchange mechanisms and other properties of thiolate-protected and phosphine-protected gold and silver nanoparticles are discussed in ...

Journal: Molecular Simulation - MOL SIMULAT, vol. 38, no. 8-9, pp. 607-614, 2012]]>We have constructed complicated 3D geometrical structures for domain engineered (i.e. [001]C-poled) rhombohedral (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) and (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-PT) ferroelectric crystals. The geometric model contains all allowed domain walls in their equilibrium orientations, and it is scalable to any domain size. All ...

Journal: Ferroelectrics, vol. 426, no. 1, pp. 13-20, 2012]]>Various linear models may be specified when attempting to estimate an apparent linear trend in real data sets, based on assumptions about the possibly unknown mechanism for generating the data. However, in many cases the best-fit line obtained from implementation of the specified model does not agree at all with the apparent trend in a scatterplot of the data, ...

Published in 2012]]>We calculate the configurations, electronic structures, vibrational properties at the coronene/Ru(0001) interface, and adsorption of a single Pt atom on coronene/Ru(0001) based on density functional theory calculations. The geometric structures and electronic structures of the coronene on Ru(0001) are compared with those of the graphene/Ru(0001). The results show that the coronene/Ru(0001) ...

Journal: Chinese Physics B - CHIN PHYS B, vol. 21, no. 3, 2012]]>As the increasing demand of small form factor and low-cost package drives the interconnect density, crosstalk noise due to the parasitic components set the limitation in off-die high speed signaling. This paper presents a barbed transmission line design to eliminate the far-end crosstalk by adding periodical stubs on the original microstrip structures. By purposely increasing the mutual ...

Conference: International Zurich Symposium on Electromagnetic Compatibility - EMC Zurich, 2012]]>In this paper I will investigate geometrical structures of multipartite quantum systems based on complex projective varieties. These varieties are important in characterization of quantum entangled states. In particular I will establish relation between multi-projective Segre varieties and multip-qubit quantum states. I also will discuss other geometrical approaches such as toric varieties to visualize complex multipartite quantum systems.

Journal: Journal of Physics: Conference Series, vol. 343, no. 1, 2012]]>The geometrical structure known as the Tulczyjew triple has proved to be very useful in describing mechanical systems, even those with singular Lagrangians or subject to constraints. Starting from basic concepts of the variational calculus, we construct the Tulczyjew triple for first-order field theory. The important feature of our approach is that we do not postulate ad hoc the ...

Journal: Journal of Physics A-mathematical and Theoretical - J PHYS A-MATH THEOR, vol. 45, no. 14, 2012]]>The comparison between two protein structures is important for understanding a molecular function. In particular, the comparison of protein surfaces to measure their similarity provides another challenge useful for studying molecular evolution, docking, and drug design. This paper presents an algorithm, called the BetaSuperposer, which evaluates the similarity between the surfaces of two structures using the beta-shape which is ...

Journal: Journal of Biomolecular Structure & Dynamics - J BIOMOL STRUCT DYN, vol. ahead-of-p, no. ahead-of-p, pp. 1-17, 2012]]>Inosine monophosphate dehydrogenase (IMPDH) is involved in de novo biosynthesis pathway of guanosine nucleotide. Type II isoform of this enzyme is selectively upregulated in lymphocytes and chronic myelogenous leukemia (CML) cells, and is an excellent target for antileukemic agent. The molecular dynamics simulation results (15 ns) of three unliganded 1B3O, 1JCN, and 1JR1 structures have clearly revealed that IN, IC (N- ...

Journal: Journal of Biomolecular Structure & Dynamics - J BIOMOL STRUCT DYN, vol. ahead-of-p, no. ahead-of-p, pp. 1-21, 2012]]>Acquire spatial information of a 3D model is very useful in many applications in the computer science field. A device broadly used as acquisition hardware of models is the 3D scanner. With a 3D scanner is possible to obtain the geometric structure based on points and triangles of a model, and use it on several computing applications. According the hardware ...

Published in 2012]]>This paper proposes to adopt a union of directional lapped orthogonal transforms (DirLOTs) to the SURE-LET image denoising. DirLOTs are 2-D non-separable transforms and can have directional characteristics under the fixed-critically-subsampling, overlapping, orthogonal, symmetric, real-valued and compact-support property. As a previous work, the author showed that a DirLOT overcomes a disadvantage of separable ...

Conference: Picture Coding Symposium - PCS, 2012]]>In noncommutative geometry, one studies abstract spaces through their, possibly noncommutative, algebras of continuous functions. Through these function algebras, and certain operators interacting with them, one can derive much geometrical information of the underlying space, even though this space does not exist as a classical topological space if the algebra is noncommutative. In this thesis the classification of certain geometrical ...

Published in 2012]]>During the past decades, considerable theoretical efforts have been devoted to studying the electronic and geometric structures and related properties of surfaces. Such efforts are particularly important for systems like the actinides for which experimental work is relatively difficult to perform due to material problems and toxicity. The actinides are characterized by a gradual filling of the 5f-electron shell ...

Published in 2012]]>We address how the electronic and geometric structures of metal surfaces determine water-metal bonding by affecting the balance between Pauli repulsion and electrostatic attraction. We show how the rigid d-electrons and the softer s-electrons utilize different mechanisms for the redistribution of charge that enables surface wetting. On open d-shell Pt(111), the ligand field of water ...

Published in 2012]]>This study addresses the need to reduce the risk of clogging when preparing samples for cell concentration, i.e., the CaSki Cell-lines (epidermoid cervical carcinoma cells). Aiming to develop a non-clogging microconcentrator, we proposed a new counter-flow concentration unit characterized by the directions of penetrating flows being at an obtuse angle to the main flow, due to ...

Journal: Microfluidics and Nanofluidics - MICROFLUID NANOFLUID, vol. 10, no. 4, pp. 855-865, 2011]]>A structure M is pregeometric if the algebraic closure is a pregeometry in all M' elementarily equivalent to M. We define a generalisation: structures with an existential matroid. The main examples are superstable groups of U-rank a power of omega and d-minimal expansion of fields. Ultraproducts of pregeometric structures expanding a field, while not pregeometric in general, do ...

Journal: Annals of Pure and Applied Logic - APAL, vol. 162, no. 7, pp. 514-543, 2011]]>This work explored the selective synthesis of polymorphs of CdWO4 in either tetragonal or monoclinic phase by optimizing the experimental parameters. Systematic characterization indicated that both polymorphs possessed similar spherical morphologies but different structural building blocks. Electronic structures calculations for both polymorphs demonstrated the same constructions of conduction band or valence band, while the conduction band widths of both polymorphs ...

Journal: Journal of Solid State Chemistry - J SOLID STATE CHEM, vol. 184, no. 2, pp. 357-364, 2011]]>Let X be a reduced closed subscheme in Pn. As a slight generalization of property Np due to Green–Lazarsfeld, one says that X satisfies property N2,p scheme-theoretically if there is an ideal I generating the ideal sheaf IX/Pn such that I is generated by quadrics and there are only linear syzygies up to p-th step (...

Journal: Journal of Algebra - J ALGEBRA, vol. 331, no. 1, pp. 243-262, 2011]]>Limited feedback is a paradigm for the feedback of channel state information in wireless systems. In multiple antenna wireless systems, limited feedback usually entails quantizing a source that lives on the Grassmann manifold. Most work on limited feedback beamforming considered single-shot quantization. In wireless systems, however, the channel is temporally correlated, which can be used to reduce feedback requirements. ...

Journal: Computing Research Repository - CORR, vol. abs/1105.5, 2011]]>This chapter reviews the fundamental characteristics and basic applications of the silicon photonic wire waveguide. Thanks to its ultra-small geometrical structures and compatibility with the silicon electronics, the silicon photonic wire waveguide provides us with a highly integrated platform for electronic–photonic convergence. For the practical achievement of this platform, however, we must search for ways to reduce the ...

Published in 2011]]>We define a new reduced model to represent coloured images. We propose to use two components for a full definition of a colour instead of three. To that end we take advantage of the geometrical structure of the HCL conical colour space and approximate its circular base by a spiral. We thus write chroma as a function of hue. The ...

Conference: International Conference on Acoustics, Speech, and Signal Processing - ICASSP, pp. 1305-1308, 2011]]>We discuss aspects and variants of the fundamental problem of relay placement: given a set of immobile terminals in the Euclidean plane, place a number of relays with limited viewing range such that the result is a low-cost communication infrastructure between the terminals. We first consider the problem from a global point of view. The problem here is similar ...

Journal: Computer Science Review, vol. 5, no. 1, pp. 57-68, 2011]]>A holographic dual description of a 2+1 dimensional system of strongly interacting fermions at low temperature and finite charge density is given in terms of an electron cloud suspended over the horizon of a charged black hole in asymptotically AdS spacetime. The electron star of Hartnoll and Tavanfar is recovered in the limit of zero temperature, while at higher temperatures ...

Journal: Journal of High Energy Physics - J HIGH ENERGY PHYS, vol. 2011, no. 1, pp. 1-15, 2011]]>In this study carbon fibers of various morphologies have been synthesized by the decomposition of acetylene over copper supported catalysts (Cu(NO3)2/TiO2, at 250°C). In order to investigate the relationship between the morphologies of the copper catalyst particle and that of the carbon fiber extruded, tilting procedures (±60 A axis and ±30 B axis) under TEM (120kV) were ...

Journal: Carbon, vol. 49, no. 9, pp. 2950-2959, 2011]]>Range sensors, in particular time-of-flight and stereo cameras, are being increasingly used for applications such as robotics, automotive, human-machine interface and virtual reality. The ability to recover the geometrical structure of visible surfaces is critical for scene understanding. Typical structured indoor or urban scenes are often represented via compositional models comprising multiple planar surface patches. The RANSAC ...

Journal: Pattern Recognition Letters - PRL, vol. 32, no. 3, pp. 403-410, 2011]]>The paper deals with Bruggeman effective medium approximation (EMA) which is often used to model effective complex permittivity of a two-phase composite. We derive the Stieltjes integral representation of the 3D Bruggeman effective medium and use constrained Padé approximation method introduced in [39] to numerically reconstruct the spectral density function in this representation from the effective complex permittivity known...

Journal: Applied Mathematics and Computation - AMC, vol. 217, no. 17, pp. 7092-7107, 2011]]>Non-local methods for image denoising and inpainting have gained considerable attention in recent years. This is in part due to their superior performance in textured images, a known weakness of purely local methods. Local methods on the other hand have demonstrated to be very appropriate for the recovering of geometric structures such as image edges. The synthesis of both ...

Journal: International Journal of Computer Vision - IJCV, vol. 93, no. 3, pp. 319-347, 2011]]>Sparse coding has received an increasing amount of interest in recent years. It is an unsupervised learning algorithm, which finds a basis set capturing high-level semantics in the data and learns sparse coordinates in terms of the basis set. Originally applied to modeling the human visual cortex, sparse coding has been shown useful for many applications. However, most of ...

Journal: IEEE Transactions on Image Processing, vol. 20, no. 5, pp. 1327-1336, 2011]]>In slightly alkaline solution (pH 8) Cd(II) ion and 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (H2P4−) form a kinetically labile complex (HOCdP5−), in which the metal center is located out of the ligand plane, due to the effects of the axial hydroxo ligand and the relatively large radius of Cd2+. Both acidification and irradiation at the Soret-...

Journal: Journal of Photochemistry and Photobiology A-chemistry - J PHOTOCHEM PHOTOBIOL A-CHEM, vol. 218, no. 1, pp. 143-155, 2011]]>This paper uses combinatorics and group theory to answer questions about the assembly of icosahedral viral shells. Although the geometric structure of the capsid (shell) is fairly well understood in terms of its constituent subunits, the assembly process is not. For the purpose of this paper, the capsid is modeled by a polyhedron whose facets represent the monomers. The assembly ...

Journal: Bulletin of Mathematical Biology - BULL MATH BIOL, vol. 73, no. 4, pp. 726-753, 2011]]>The upscaling process of mass transport with chemical reaction in porous media is carried out using the method of volume averaging under diffusive and dispersive conditions. We study cases in which the (first-order) reaction takes place in the fluid that saturates the porous medium or when the reaction occurs at the solid–fluid interface. The upscaling process leads to ...

Journal: Chemical Engineering Science - CHEM ENG SCI, vol. 66, no. 10, pp. 2177-2190, 2011]]>The linear regression model is a very attractive tool to design effective image interpolation schemes. Some regres- sion-based image interpolation algorithms have been proposed in the literature, in which the objective functions are optimized by ordinary least squares (OLS). However, it is shown that inter- polation with OLS may have some undesirable properties from a robustness point of view: ...

Journal: IEEE Transactions on Image Processing, vol. 20, no. 12, pp. 3455-3469, 2011]]>First-principles, all-electron, ab initio calculations have been performed to construct an equivalent potential of water for the electronic structure of glycine (Gly) in solution. The calculation involved three steps. The first step was to search for the minimum-energy geometric structure of the Gly + nH2O system. The second step was to calculate the electronic structure of Gly ...

Journal: Journal of Molecular Modeling - J MOL MODEL, vol. 17, no. 1, pp. 111-124, 2011]]>A pentapod is usually defined as a 5-degrees-of-freedom fully-parallel manipulator with an axial spindle as moving platform. This kind of manipulators has revealed as an interesting alternative to serial robots handling axisymmetric tools. Their particular geometry permits that, in one tool axis, high inclination angles could be attained, thus overcoming the orientation limits of the classical ...

Journal: Mechanism and Machine Theory - MECH MACH THEOR, vol. 46, no. 8, pp. 1107-1120, 2011]]>The geometrical structure, electronic structure, one-photon and two-photon absorption properties of a series of macrocyclic thiophene derivatives C[3T_DA]n (n = 2–5) have been studied using density functional theory (DFT) and Zerner’s intermediate neglect of differential overlap (ZINDO) methods theoretically. The results showed that the range of λ(1)maxs is 390–470 nm and λ(2)...

Journal: Dyes and Pigments - DYE PIGMENT, vol. 91, no. 2, pp. 248-257, 2011]]>3D reconstruction is a major problem in computer vision. This paper considers the problem of reconstructing 3D structures, given a 2D video sequence. This problem is challenging since it is difficult to identify the trajectory of each object point/pixel over time. Traditional stereo 3D reconstruction methods and volumetric 3D reconstruction methods suffer from the blank wall problem, and the ...

Journal: Journal of Visual Communication and Image Representation - JVCIR, vol. 22, no. 5, pp. 421-431, 2011]]>Due to oxidation and adsorption of chloride and hydroxyl anions, the surface of titanium (Ti) implants is negatively charged. A possible mechanism of the attractive interaction between the negatively charged Ti surface and the negatively charged osteoblasts is described theoretically. It is shown that adhesion of positively charged proteins with internal charge distribution may give rise to attractive interaction between ...

Journal: Computer Methods in Biomechanics and Biomedical Engineering - COMPUT METHODS BIOMECH BIOMED, vol. 14, no. 5, pp. 469-482, 2011]]>A convenient way of dealing with image sets is to represent them as points on Grassmannian manifolds. While several recent studies explored the applicability of discriminant analysis on such manifolds, the conventional formalism of discriminant analysis suffers from not considering the local structure of the data. We propose a discriminant analysis approach on Grassmannian manifolds, based on a graphembedding framework. ...

Conference: Computer Vision and Pattern Recognition - CVPR, pp. 2705-2712, 2011]]>In this paper, we introduce the concept of an exoskeleton as a new abstraction of arbitrary shapes that succinctly conveys both the perceptual and the geometric structure of a 3D model. We extract exoskeletons via a principled framework that combines segmentation and shape approximation. Our method starts from a segmentation of the shape into perceptually relevant parts and then constructs ...

Journal: Computers & Graphics - CG, vol. 35, no. 1, pp. 112-121, 2011]]>The generalized dynamic inversion control methodology is applied to the spacecraft attitude trajectory tracking problem. It is shown that the structure of the skew symmetric cross product matrix alleviates the need to include the inertia matrix in the control law. Accordingly, the proposed control law depends solely on attitude and angular velocity measurements, and it neither requires knowledge of the ...

Journal: Acta Astronautica - ACTA ASTRONAUT, vol. 68, no. 11, pp. 1742-1751, 2011]]>Binary and ternary complexes of Ni2+, Cu2+, Ag+ and UO22+ with the prepared carboxymethyl cellulose in its sodium salt (P-NaCMC) and pyridine (py) as secondary ligand have been prepared. Probable structures of the binary and ternary complexes were inferred via elemental analysis, spectral data (IR, mass and solid reflectance) as well as magnetic susceptibility measurements, thermal and XRPD analysis. ...

Journal: Carbohydrate Polymers - CARBOHYD POLYM, vol. 83, no. 1, pp. 94-115, 2011]]>Schiff base (L) ligand is prepared via condensation of pyridine-2,6-dicarboxaldehyde with -2-aminopyridine. The ligand and its metal complexes are characterized based on elemental analysis, mass, IR, solid reflectance, magnetic moment, molar conductance, and thermal analyses (TG, DTG and DTA). The molar conductance reveals that all the metal chelates are non-electrolytes. IR spectra shows that L ...

Journal: Spectrochimica Acta Part A-molecular and Biomolecular Spectroscopy - SPECTROCHIM ACTA PT A-MOL BIO, vol. 78, no. 1, pp. 36-44, 2011]]>This paper provides an overview of the universal study of families of dynamical systems undergoing a Hopf-Neĭmarck-Sacker bifurcation as developed in [1–4]. The focus is on the local resonance set, i.e., regions in parameter space for which periodic dynamics occurs. A classification of the corresponding geometry is obtained by applying Poincaré-Takens reduction, Lyapunov-Schmidt reduction...

Journal: Regular & Chaotic Dynamics - REGUL CHAOTIC DYN, vol. 16, no. 1, pp. 39-50, 2011]]>A BV algebra and a QP-structure of the degree 3 is formulated. A QP-structure of degree 3 gives rise to Lie algebroids up to homotopy and its algebraic and geometric structure is analyzed. A new algebroid is constructed, which derives a new topological field theory in 4 dimensions by the AKSZ construction.

Journal: Communications in Mathematical Physics - COMMUN MATH PHYS, vol. 303, no. 2, pp. 317-330, 2011]]>We present a generally covariant formulation of human arm dynamics and optimization principles in Riemannian configuration space. We extend the one-parameter family of mean-squared-derivative (MSD) cost functionals from Euclidean to Riemannian space, and we show that they are mathematically identical to the corresponding dynamic costs when formulated in a Riemannian space equipped with the kinetic energy metric. ...

Journal: Physical Review E - PHYS REV E, vol. 83, 2011]]>