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The impedance boundary network condition (INBC) is widely used build parametric model of thin materials, fine mesh subdivision in finite difference time domain (FDTD) method can be avoided and the computational efficiency can be greatly improved. This paper proposes the z model method to describe the relations between the input and output in discrete time domain which have the relations between different...
Advanced technology level is an important guarantee of civil aircraft projects, and it also must be adapted to market and consumers. This study mainly explores the technology dimension and its effect on performance in the design of civil aircraft. We develop four dimensions for aircraft technology readiness level, and conduct an empirical study among airports and airlines in China, build a grey correlation...
We presented a dual-layer packaging layout and its enhancement effect on light efficiency (LE) and angular color uniformity (ACU). In this packaging layout, a thin film of TiO2/ silicone nanocomposite is inserted between LED chips and phosphor layers. And the phosphor layer is a convex shape and Restricted to the surface of LED chips. The effects of TiO2 concentration and particle size on the LE and...
In this paper, a Stacked Sparse Autoencoder (SSAE) based framework is presented for nuclei classification on breast cancer histopathology. SSAE works very well in learning useful high-level feature for better representation of input raw data. To show the effectiveness of proposed framework, SSAE+Softmax is compared with conventional Softmax classifier, PCA+Softmax, and single layer Sparse Autoencoder...
4∗20Gb/s NRZ to RZ conversions are experimentally demonstrated using a single SOA and a silicon based integrated multi-channel comb filter and AWG. Bit error ratio measurements show the good performance for the proposed scheme.
An all-optical clock recovery scheme with wide range of ∼12GHz is proposed and demonstrated using a silicon microring resonator assisted by an amplitude equalizer. Single and dual channel clock recovery at 40Gb/s has been achieved.
We propose and fabricate a silicon based polarization insensitive scheme consisting of a micro ring resonator and two 2-dimensional grating couplers. For demonstration, simultaneous demodulation for WDM-PDM NRZ-DPSK signals has been achieved successfully with error free, reflecting the good performance and the practicability of the proposed scheme.
In this paper, we present an automatic framework combined space-time signal processing with Time Reversal electromagnetic (EM) inversion for subsurface multi-target imaging using Ground Penetrating Radar (GPR). This framework is composed of a Frequency-Wavenumber (FK) filter to suppress direct wave and ground bounce, a FK migration algorithm to automatically estimate the number of targets and identify...
An integrated framework is presented in this paper to automatically achieve rebar detection and defection classification inside tunnel. This framework is composed of GPR return preprocessing to perform clutter reduction, a Frequency-wavenumber migration algorithm to focus the hyperbola, an energy scanning method to extract the region of interest(ROI) and to achieve rebar detection, and a multi-class...
With the aim of overcoming the disadvantage of rapid lighting changes, a moving object detection algorithm based on background and consecutive frames difference is presented. At first, background model is obtained by statistical properties of pixels block-based. Then, the moving object is extracted with background subtraction and multi-frame-differencing, which is insensitivity to the target object's...
Discrete Element Method is applied to study the process of powder densification in High Velocity Compaction. Assuming that powder is formed by viscoelastic metal particles, the contact model of particle flow and the equation of motion of each particle are established, and constitutive model of viscoelastic powder in High Velocity Compaction described by force-displacement is deduced in detail. Based...
The evaluation of earth observing satellite system is a complex problem which is multi-subject, multi-factor, multi-layer and multi-object, the general evaluation method exists subjective and dim. Scientific evaluation improves the acknowledge of system, it provides the basis of system optimization, in order to enhance science level of earth observing satellite system, the paper presents the complex...
The rapid growth of World Wide Web in recent years has made it important to carry out resource discovery Topic-specific web crawler collects relevant web pages of interested topics from the Internet, there are many relevant researches focusing on topic-specific crawling. However few works detail the topic-specific crawling with the user interests. In this paper, we present a new user interests model...
Objective Xanthine oxidase inhibitory activities of the total biflavonoids and eight biflavonoid compounds isolated from the medicinal plants of Selaginella labordei have been investigated. Method The active compounds were screened out by measuring the inhibition rate and the 50% inhibitory concentration (IC50) of each sample against xanthine oxidase (XOD) in vitro. Result Three kinds of biflavonoids...
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