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The effect of scintillator geometry on the quality of neutron/γ pulse shape discrimination (PSD) in EJ-299 plastic scintillator, using a digital charge integration PSD algorithm has been studied. It is shown that the PSD Figure of Merit (FOM) reduces as the geometry of the scintillator moves from a cube-like shape towards a flat panel shape. The PSD performance in this material at high flux irradiation...
The dense matching of 3-D meshes is an important research topic in the field of computer vision. In this paper, we present a layered matching pipeline based on the mixed corresponding grid dense matching algorithm. Firstly, this algorithm find an intrinsic map between two non-isometric, genus zero surfaces. Secondly, we use the nature of the bottom of the measure preserving distance to released the...
Nowadays, facial expression synthesis is widely used in expression simulation, recognition and animation. Texture feature (wrinkle) after face deformation largely reflects the genuineness of the synthesized expression, whose mapping is a critical step to the expression synthesis application. However, current lighting ratio based wrinkle mapping is sensitive to small source lighting and large lighting...
The spherical-multipole analysis in sphero-conal coordinates in combination with a complex-source beam as the incident field has been utilized to derive the scattered electromagnetic far-field of a PEC plane angular sector. That canonical problem is of particular practical interest as many structures contain edge-like elements which cannot be treated by common asymptotic high-frequency techniques...
We present an inverse algorithm based on Level Set method for optimizing the shape of planar antenna structure or arrays from imposed constraints (e.g. desired or imposed radiation patterns, gain or directivity) or for reconstructing it from measurements. The forward problem is solved using an integral formulation of the EM problem with finite element discretization. The shape gradient is computed...
A novel method for the detection and segmentation of nuclei and cells in Pap smear images is introduced. The method is based on a geometric analysis of iso- and edge-contours. For nuclei detection we employ isocontours taken at different levels of intensity and we report best detection (object) recall values as well as best segmentation precision values. For cell outline detection, we employ traditional...
In order to perform productive autonomous excavation of a fragmented rock pile, it is necessary to recognize the condition of the fragmented rock pile and to plan appropriate excavating motion according to the condition of the fragmented rock pile. In this paper, we propose imitation-based motion planning method, and develop a recognizer of rock pile condition and an excavating motion planner. We...
High-speed vision technology in which not just image capturing and recording but also image processing are executed simultaneously at high frame rates, exceeding video rates (30 Hz), has recently been considered an important technology for various applications, such as robotics, and man-machine interfaces. However, the image processing performed in conventional high-speed vision systems is mainly...
A 3D Monte Carlo model has been used to simulate the Dark Current Non Uniformity of image sensors. The consequences of the border crossing effects on the DCNU has been analysed through different pixel geometries.
We present a method to improve the visual quality of point cloud renderings through a nearest-neighbor-like interpolation of points. This allows applications to render points at larger sizes in order to reduce holes, without reducing the readability of fine details due to occluding points. The implementation requires only few modifications to existing shaders, making it eligible to be integrated in...
This paper is a part of an ongoing research project that is seeking to clarify the interrelationship between the architecture of the Alhambra and Andalusian music at that time. Despite that Alhambra was built long ago before the recent digital age, but it contains some phenomena's that points out to the relationship between 2D and 3D patterns and the type of music at that time. The term “digital”...
This paper introduces a Fresnel-like reflector antenna design producing high-order Orbital Angular Momentum states. This design is referred to as a Fresnel-like reflector because the typical surface discontinuity corresponding to the wrapped phase is only applied to the helical shaping and not to the basic parabolic shape so as to maintain broad band operation. This approach is found to provide stronger...
Efficiently porting ordinary applications to Blue Gene/Q supercomputers is a significant challenge. Codes are often originally developed without considering advanced architectures and related tool chains. Science needs frequently lead users to want to run large numbers of relatively small jobs (often called many-task computing, an ensemble, or a workflow), which can conflict with supercomputer configurations...
Geometry is one of the basic skills to be mastered in Malaysian Mathematics education. However, there is not much information or study on elementary geometry attainment in Malaysia. Therefore, this study aims to review teachers' perspectives on teaching and learning of the geometry topic ‘Shapes and Spaces’ at primary level. Ten questions such as “How are the students' performance in learning ‘Shapes...
Real-time terrain rendering has been an important issue in the research of virtual reality. There are two key technologies in real-time terrain rendering process, one is how to organize large amounts of terrain data effectively, and the other is how to shift those terrain data from CPU to GPU during the rendering process. The terrain structure is based on the Geometry Clipmap and the terrain elevation...
In this paper, the superformula introduced by Gielis is used as a generator of various shapes for metamaterial unit-cells. This formula has already been used to describe the complicated shapes found in nature. Some of these designs are simulated and it is shown that they are capable of providing resonances in their frequency response. The superformula has a lot of potential for creative shape designs...
The consideration of meaningful geographical objects instead of individual pixels is the main distinguishing characteristic of Geographic Object-Based Image Analysis (GEOBIA) methods. In this regard, meaningful geographical objects enable image analysis methods to consider extra information, such as geometry, texture and spatial relationships to analyse imagery. However, meaningful geographical objects...
Classical unmixing algorithms focus primarily on scenarios with a single mixture. These techniques are easily extensible in the case of images with multiple discrete mixtures (i.e. no shared endmembers). Unmixing in scenarios with multiple mixtures with shared or common endmembers is significantly harder. Manifold clustering and embedding seem tailor-made for such a scenario, but generally these algorithms...
A machine with large output stiffness variation can meet the requirement in different working environments. This paper presents an approach to design a linear variable-stiffness mechanism (LVSM) with adjustable zero-to-infinite stiffness. The idea is to use circular slots to adjust the initial rotation of two parallel connected springs. The output force to displacement curve can exhibit zero to very...
Sculpture design is challenging due to its inherent difficulty in characterizing an artwork quantitatively, and few works have been done to assist sculpture design. We present a novel platform to help sculptors in two stages, comprising automatic sculpture reconstruction and free spectral-based sculpture pose editing. During sculpture reconstruction, we co-segment a sculpture from real scene images...
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