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Photometric ambient occlusion estimation is to recover the local visibility of a scene from multiple illuminations at a fixed viewpoint. Its effectiveness is highly dependent on the amount of illuminations. In this paper, we study how to reliably extract photometric ambient occlusion from sparsely sampled illuminations. We specifically propose an effective relative entropy minimization framework to...
The sea area under the jurisdiction of China is approximately 300 million km⁁2, which is one-fifth of the land area of China. There are a plenty of marine resources in China. So, some ocean development strategies are proposed in the 13th Five-Year Plan and 18th Party Congress of China. Now, different sources of ocean mapping determine data's differences in classification, scale, spatial location,...
A novel unsupervised change detection approach for multi-spectral remote sensing data based on morphological transformation is presented. Profiles obtained by attribute filters can provide a rich multi-level analysis of the contextual information. The proposed method is based on the assumption that pixels belonging to changed areas exhibit profiles with significant differences due to a variation in...
Free form surface modeling is one of the most advanced procedures of creating digital models in CAD. Use of free surface for creating solid models has become increasingly relevant in terms of technological possibilities of production in the subsequent phases of the product lifecycle. Multi-axis computer-controlled machines are standard even in small workshops and rapid prototyping is undergoing progressive...
The recent development of the Reprap project, hence the 3D RepRap printers, has made 3D polymer-based fused deposition modelling (FDM) technology prevalent among office and home users. Although fused deposition has many advantages in terms of speed and the ability to deposit molten polymer material with feasible strength and other material properties, shape imprecision is one of the main problems...
An improvement in the resonant microcantilever-based sensor's sensitivity is proposed by varying the microcantilever weight distribution. The relationship between the resonant frequency of different microcantilevers and their dimensions is investigated using the analytical method and finite element method. The principle to increase the resonant frequency drift when the target gas is absorbed by the...
Researchers gave the vehicle and pedestrian detection lots of attention to alarm the drivers for improving the safety of transportation systems. However, bicycles are also the significant factor of the safety on road. In this paper, a bicycle detector for side-view image is proposed based on the observation that a bicycle consists of two wheels in the form of ellipse shapes and a frame in the form...
Ink-jet 3D printing is an additive manufacturing process where-in parts are built by jetting material from nozzles layer by layer, with curing between successive layers of deposition. Typically, this additive process is operated in an open-loop manner, i.e., the number of layers and droplet patterns for each layer are determined in advance and are not modified based on measurements of current height...
A parametric study of the Nojima wrap pattern geometry is performed. Design formulas for Nojima origami conical spiral antenna (CSA) are derived. The formulas can be used to produce the properties of the morphing CSA.
A gradient-based shape optimization scheme combined with an interface-enriched generalized finite-element method (IGFEM) is proposed to efficiently optimize electro-magnetic (EM) problems. To avoid mesh distortion or the expensive process of repeatedly creating a conformal mesh for each design configuration, the problem geometry is projected onto a fixed background mesh that is not necessarily conformal...
The challenge of deriving a surface integral equation formulation that will be inherently compressible, for the purpose of designing general fast direct solvers, is addressed. Preliminary attempts to develop generalized equivalence and generalized source formulation-based solvers are presented. The limitations arising from these newly introduced generalized formulations on the direct solvers' accuracy...
The health status of a railway tunnel should be regularly inspected during its service period for safe operation. The frequency of periodic inspection should be increased when the tunnel has become aged. For the coverage tunnels, health assessment is more essential. Ground penetrating radar (GPR) has been used as a key tunnel health detecting technique; however, so far, such (GPR) techniques are in...
Full-Duplex (FD) transceivers may be expensive in terms of complexity, power consumption, and price to be implemented in all user terminals. Therefore, techniques to exploit in-band full-duplex communication with FD base stations (BSs) and half-duplex (HD) users' equipment (UEs) are required. In this context, 3-node topology (3NT) has been recently proposed for FD BSs to reuse the uplink (UL) and...
In this paper, we propose a new approach of network performance analysis, which is based on our previous works on the deterministic network analysis using the Gaussian approximation (DNA-GA). First, we extend our previous works to a signal-to-interference ratio (SIR) analysis, which makes our DNA-GA analysis a formal microscopic analysis tool. Second, we show two approaches for upgrading the DNA-GA...
The effect of capillary-to-capillary variation on the robustness of a fine pitch wire bonding process is studied using an analytical model developed with the goal to make predictions with respect to the shape of the bonded ball and the capillary tip geometry and tolerances for fine pitch ball bonding. The model includes stepwise deformation of the ball which is calculated based on concepts such as...
In this study, basic steps which is necessary to develop a mobile educator platform for children were explained using SVM (Support Vector Machine) and mobile platforms. In this system based on Support Vector Machines, it was asked for the children to draw basic geometric shapes and created a smart application that provide supportive feedback to them. It is aimed to develop basic education skill and...
There is an increased need for coupling machine descriptions to various fusion physics codes. We present a computer aided design (CAD) service library that interfaces geometrical data requested by fusion physics codes in completely programmatic way for use in scientific workflow engines. Fusion codes can request CAD geometrical data at different levels of details (LOD) and control major assembly parameters...
This paper proposes a new method for the segmentation of the scanned point clouds that achieves an accurate definition of objects' faces, critical for their digitalization. The topological structuring of the input point cloud is realised by a nearest-neighbour graph, while locally fitted surfaces are used to quantify the objects' shapes. Noise is filtered by a graph-cut and the segmentation is performed...
In this paper, the bandwidth and dimensions of different dual-band Artificial Magnetic Conductors (AMCs) for 2.5/5.5 GHz WiFi applications are compared. The simulation results indicate that the double hexagon structure presents a superior performance compared to the others. The measured results of two different structures are in very good agreement with the simulated ones, and hence, the study is...
An analytical approach for controlling the zeros of a scattering event (i.e., cloaking) is given, substituting the concept of positive-negative constitutive parameters with a positive-negative contrast formulation. Starting from the zero scattered field condition, a proper manipulation is performed and two different equations are derived: the Contrast-Field-Green Cloaking Equation (CFGCE) and the...
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