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This paper proposes a transient modeling and analysis method for the fractional-order DC-DC converters in continuous conduction mode (CCM), in which a fractional-order Buck converter is taken as an example. By extending the usage of equivalent small parameter method (ESP), the converter is modeled by a general state vector differential equation. Then by adopting the principle of harmonic balance,...
We propose a novel deep layer cascade (LC) method to improve the accuracy and speed of semantic segmentation. Unlike the conventional model cascade (MC) that is composed of multiple independent models, LC treats a single deep model as a cascade of several sub-models. Earlier sub-models are trained to handle easy and confident regions, and they progressively feed-forward harder regions to the next...
The development of high voltage technology provides technical conditions for the transmission of offshore new energy, but it is necessary to consider the operation status of power grid when we decide the way of grid connection. This paper focuses on the stability of the system and evaluates three access form — the high voltage alternating current (HVAC), traditional direct current (DC) and flexible...
A fiber with cladding made of uniaxial anisotropic crystal material whose optical axis is parallel to the axis of fiber was proposed, and the nonlinear parameter γ of this kind of fiber was investigated theoretically. The ratio (kcl) of the extraordinary to the ordinary ray index was introduced and the influence of parameter kcl upon γ was examined by exact vector modes method. The calculated results...
This paper addresses semantic image segmentation by incorporating rich information into Markov Random Field (MRF), including high-order relations and mixture of label contexts. Unlike previous works that optimized MRFs using iterative algorithm, we solve MRF by proposing a Convolutional Neural Network (CNN), namely Deep Parsing Network (DPN), which enables deterministic end-to-end computation in a...
Tuning mechanism is considered to be a PIM source in coaxial resonator. A study of the influence on PIM by the placement of tuning mechanism has been made in this paper. The current on the resonance rod is used to calculate tunneling current, which is employed to predict the PIM level in a cavity. A method of approximation for nonlinearity is presented, using analytic formula to determine the coefficients...
Efficient dental segmentation from volume data provides important assistance for orthodontic surgery and treatment. However, this task exits several major challenges due to the special dental anatomy and topological changes. This paper presents a robust interactive dental segmentation method, which treats this problem as a semi-supervised learning task. An initial classification of 3D mean shift is...
Microwave cavity with complicated structure and rubidium gas is studied by mode matching method. By calculating resonant frequencies of TE011 mode, main factors that influence resonant frequency is studied. In addition, the resonant frequency of TE011 mode is compared with commercial software (CST) results. The computed results show good agreement with CST simulations. It can be seen that this method...
Magnetic endoscope imaging system is a non-radiographical imaging technique, which helps endoscopists a lot in colonoscopy. It consists of two parts: localization and display. In the part of localization, coils embedded in the colonoscope sense the magnetic field generated by excitation sources. The coupling between excitation sources and sensors can determine a set of equations which contain parameters...
Magnetic dipole positioning technique has attracted more and more attention recently, for its increasing applications in medical, traffic, and the tracking of motion objective, because it provides high accuracy and fast velocity. Typically, a nonlinear optimization algorithm is applied to such a problem, but a linear algorithm is preferable for faster, more reliable computation, and lower complexity...
As the Web development moves into its second phase of the Web evolution, it has been decided to set up a Web 3.0 research group aimed at constructing an electronic commerce platform combined with an electronic tracking system for agricultural products based on Web 3.0. This paper outlines the concept of Web 3.0 and how to build an agriculture business related platform using Web 3.0 technology. The...
This paper takes the 3-UPU parallel manipulator which possesses 3 translational and 1 revolute (3T1R) motions as a studying case. The sensitivity of degree of freedom (DOF) characteristics and kinematic errors resulting from various kinds of torsion angle errors is observed. Kinematic model of the manipulator is established and typical torsion angle errors are enumerated. Based on the model and particular...
This paper takes the 3-UPU parallel manipulator which possesses 3-D pure translational motion as a studying case. The sensitivity of degree of freedom (DOF) characteristics and kinematic errors resulting from various kinds of assembly errors is observed. Kinematic model of the manipulator is established, therefore, typical assembly errors are enumerated. Based on the model and particular probability...
Microwave cavity with complicated structure and rubidium gas is studied by mode matching method. By deducing eigen equation and calculating resonant frequency of TE0 mode, main factors that influence resonant frequency is studied. In addition, the resonant frequency of TE0 mode is compared with commercial software (CST) results. The computed results show good agreement with CST simulations. It can...
This paper presents the design and FPGA implementation of a 24-bit audio DAC incorporating a set of multiplier-free interpolation filters and a 4th-order 1-bit sigma-delta modulator (SDM). The whole system achieves a signal to noise ratio (SNR) as high as 139dB with idle tones and noise modulation virtually eliminated. For the fixed point interpolation filters, multiplier-free canonical signed digits...
In the system of the PV grid-connected generation, because of the dispersion of the PV panel, difference of the sun radiation condition and the shadow of a part of the PV panel, they will cause the serious loss of energy for the parallel PV panel. In order to overcoming energy loss and raise the efficiency of the PV system, a new maximum power point tracking method called distributed variable step...
For research on conceptual design of the complex product, it is necessary that a reliable theory is found to decide if the design structure is suit for custom requirement. The correlation matrixes among requirements, functions and structures are proposed. A block diagonal matrix of correlation matrix between functions and structures is given. The mathematical models of multi-object optimization structure...
The resonant characteristic of the cylindrical microwave cavity filled with complicated dielectric in rubidium frequency standard is investigated by using mode matching method. In order to study main factors influencing resonant characteristic, resonant frequencies of HE111 mode are calculated and compared with commercial software (CST) results. The results show good agreement between theoretical...
It is significant that to get accurate prediction of dynamic traffic flow for intelligent traffic system management and control. A traffic flow prediction model of spatial-temporal 2D (2-dimension) data fusing based on SVM (Support Vector Machines) is put forward in this paper. The section flow results predicted by temporal SVM, spatial SVM and spatial-temporal 2D data fusing are all satisfied the...
microwave cavity with complicated structure dielectric and hollow center is investigated by mode matching method. By deducing eigen equation and calculating resonant frequencies of TM0 mode, main factors that influence resonant frequencies is studied. In addition, the resonant frequencies of TM0 mode is compared with commercial software (CST) results. The results show good agreement between computations...
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