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In this paper we propose a unified framework for learning such local image descriptors that describe pixel neighborhoods using binary codes. The descriptors are constructed using binary decision trees which are learnt from a set of training image patches. Our framework generalizes several previously proposed binary descriptors, such as BRIEF, LBP and their variants, and provides a principled way to...
The goal of this work was to (1) evaluate different gear concept for spaceflight application with minimum backlash, (2) design a test setup to test the most promising concepts, and (3) conduct preliminary validation tests. The evaluation focused on the primary possibilities to influence the behavior of gear performance: variation of material and variation of geometry. The synthetic materials PEEK...
We measured the current-voltage and infrared optical transmission characteristics of thin film VO2 wires over the metal-insulator phase transition. The phase transition had electrical or thermal characteristics depending on the wire geometry and applied current.
Controlled nanostructuring of thin-film solar cells offers a promising route toward increased efficiency through improved light trapping. Many such light trapping designs involve structuring of the active region itself. Optimization of these designs is aided by the use of computer simulations that account for both the optics and electronics of the device. We describe such a simulation-based approach...
Computing ambient occlusion in screen-space (SSAO) is a common technique in real-time rendering applications which use rasterization to process 3D triangle data. However, one of the most critical problems emerging in screen-space is the lack of information regarding occluded geometry which does not pass the depth test and is therefore not resident in the G-buffer. These occluded fragments may have...
Wheel speed sensors determine the angular velocity of rotating axes and are widely used in modern industry with a variety of applications. This paper provides a general introduction to back bias speed sensor systems, presenting and discussing the numerous parameters of a general 3D model. The underlying physical mechanisms of the back bias principle are explained with the help of 2D FEM magneto-static...
The Roll-Ring with a rolling electrical contact is usually utilized in an electrical energy transmission system between two continuous relative rotated equipments, such as the rotation system in radar, tank, space station and so on. As long as the requirement of the transmission power increasing in these years, the rolling electrical characteristic is more and more important for the long-life design...
Particle therapy system simulation framework, PTSIM, is a simulation framework based on Geant4 Monte Carlo simulation. It has been developed in the project, “Development of simulation framework for advanced radiotherapy”, funded by the Japan Science and Technology Agency (JST) in the program of Core Research for Evolutional Research and Technology (CREST), from 2003 to 2010. The PTSIM has provided...
The command-based interface of importance biasing technique has been developed using Geant4 for shielding applications. The purpose of this study is to develop a tool for calculating spatial dose distributions in radiation therapy facilities for radiation protection. The primary method of radiation control is to design physical features of shielding and barriers in radiological areas. Monte Carlo...
A circular hole in a metal plane is covered by oblate spheroidal lenses of equal dimensions that are anti-isorefractive to each other and located on opposite sides of the hole. The structure is surrounded by free space and illuminated by an electric dipole located on the axis of symmetry of the structure and axially oriented. The exact solution to the boundary-value problem is obtained as infinite...
The illumination of rough refraction is challenging due to the complex integrations of scattered lights from multiple directions. Prefiltered environment map is able to eliminate the comprehensive integrations, but the precomputation stage protects it from being adapted into dynamically varying environmental lighting. We propose a real-time method for rendering rough refraction, supporting dynamically...
The geometrical structure of carbon nanotubes has been calculated and analyzed in this paper. The analysis of carbon nanotube for Pz orbital, perpendicular to the graphene sheet and thus the nanotube surface forms a delocalized π network across the nanotube, which is responsible for its electronic properties. These electronic properties are obtained from tight binding (TB) model for graphene. Furthermore,...
A novel geometry is proposed to achieve sum and difference patterns using a monopole antenna as the feed. This geometry consists of a dielectric flare with an embedded uniaxial wire medium acting as an ENZ material. Beams are formed via total internal reflection, but by placing two metallic plates on two side walls of the flare, sum and difference patterns can be interchanged. Physics of the structure...
The drift-diffusion approach is used to form an integro-differential equation for scattering problems involving three dimensional wire medium objects. The method is applicable to arbitrary three dimensional uniaxial and isotropic geometries. A spherical isotropic wire medium and a cubical uniaxial wire medium object are simulated numerically using the drift-diffusion method. The results are compared...
The laser-based magneto-optic microscopy (LMOM) system is based on eddy current technology and its image quality mainly depends on the incentive effects, where the excitation coil is widely adopted as an incentive device by placing it above the inspecting surface of the specimen. This paper proposed an innovative excitation coil design, which can generate a region of linear eddy current distribution...
This paper presents the method and result of optimizing a 5MW Transverse Flux Permanent Magnet (TFPM) generator using a genetic algorithm method. Because the main disadvantage of a TFPM generator is the price, a reduction in costs has to be considered in order to make it more attractive for the industry. The approach presented in this paper focuses on a reduction in mass of active materials, which...
4D Transesophageal Echocardiography (TEE) is a newly developed tool to visualize the morphology and dynamics of the mitral valve for diagnosis and treatment planning. Quantitative patient-specific modeling of the mitral valve is demanded since it allows for the reliable predictive simulation of medical intervention. State-of-the-art image-based and biomechanical models with generic material parameters...
We manipulate the topology of geometrically similar quantum graphs (networks of quantum wires) to discover configurations with large increases in their optical nonlinearities.
Among various 2D materials, monolayer transition-metal dichalcogenides (TMDs) with intrinsic band gaps (1.1–2.2 eV) are considered as promising candidates for next generation electronics. For applicability of these novel materials as transistors, a comprehensive understanding of metal contacts to them is an absolute necessity, which is lacking at present. In this paper, we report a systematic study...
Accurate simulation of SAW devices requires accurate material tensor data. However, literature values are in most cases measured on certain engineered test devices and do often not reflect real world production processes with the necessary accuracy. In this work, a parameter identification method is outlined, which can be used to estimate material parameters from admittance measurements of resonators...
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