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Synthetic Aperture Radar (SAR) image is disturbed by multiplicative noise known as speckle. In this paper, based on the power of deep fully convolutional network, an encoding-decoding framework is introduced for multisource SAR image despeckling. The network contains a series of convolution and deconvolution layers, forming an end-to-end non-linear mapping between noise and clean SAR images. With...
Corn is one of the most essential economic crops globally and is an important part of China's agricultural industry. Corn growth monitoring is helpful for agricultural land reallocation and production evaluation. The compact polarimetric (CP) SAR could be a good tool for large area surveillance as it overcomes the width limitation of fully-polarimetric (FP) SAR, whereas still inherits abundant information...
Hi-C technique is an important tool for the study of 3D genome organization. In the past few years, we have seen an explosion of Hi-C data in a variety of cell/tissue types. While these publicly available data presents an unprecedented opportunity to interrogate chromosomal architecture, how to quantitatively compare Hi-C data from different tissues and identify tissue-specific chromatin interactions...
Communication data in the communication network of the islanded micro-grid can be disturbed by many methods, such as data attack or packet loss. In order to overtake the communication data disturbance (CDD), a new hierarchical control structure is proposed in the paper. Based on the concept of cyber physical system (CPS), the control structure is divided into two layers: cyber layer and physical layer...
The modular multilevel converters (MMC) has become an attractive research subject of power electronics due to its special topology. In this paper, a novel sub-module circuit for the MMC is proposed. Compared with the traditional sub-module circuits, the number of power semiconductors used in the proposed circuit is reduced by a quarter. Then, an improved three-phase multilevel topology is also constructed...
A novel sub-module circuit is proposed in this paper based on the controllability theory. At first, traditional full bridge sub-modules (FBSM) of the MMC is modeled as a switched linear system, then controllability of the switched linear system model of the sub-module circuit is studied. It is found that the sub-module circuit is state controllable with only four operation modes adopted in the model...
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,...
Insulated gate bipolar transistors (IGBTs) are one of the most critical components in the Electric Vehicles (EVs) because of their complex running environment, high power dissipation and frequent junction temperature fluctuation. Therefore, it's essential to predict the lifetime of IGBTs by considering the actual factors in applications. The aim of this paper is to present a lifetime prediction method...
Inverters are widely applied in industrial fields. To acquire the analytical solution of sinusoidal pulse width modulation (SPWM) Single-phase inverters, a traditional harmonic balance based method is extended, in which the double Fourier transform is used to describe the nonlinear switching function of the converter. Thus the steady-state periodic solution of the inverter can be obtained by our approach...
The stability analysis of multi-stage DC-DC converters system is a big challenge, since the interaction among the individual converters can lead to an instability of the whole system. This paper applied the stability analysis method based on Floquet theory for a three-stage DC-DC converters system. In this paper, the stability analysis method based on Floquet theory is reviewed at the beginning. Following,...
Variable on Time (VOT) control is proposed in the paper. Compared to conventional constant on time (COT) control, the on time of VOT control is modulated by output of error amplifier, rather than fixed voltage. VOT controlled buck converter shows significant duty cycle extension than COT control, especially for high switching frequency and wide input/output range applications, such as DVS converters...
According to the system characteristics of closed-loop dc-dc converter, a periodic switched affine systems model of the power regulator is established. Based on switched systems theories, an corresponding augmented periodic switched autonomous systems model is presented by augmentations of the state variables. Thus, the relatively simple transfer matrix multipliers of the augmented systems are used...
The rapid growth of data center traffic, driven by cloud technology adoption, has propelled the development of a variety of spectrally efficient modulation formats, such as 4-level pulse amplitude modulation (PAM4), quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM). High speed CMOS DSP-based transceivers provide complex equalization scheme to compensate for the channel...
The paper proposes a novel voltage event-triggered P-U control strategy for improving related active power sharing accuracy in low-voltage microgrid (MG). Active power sharing inaccuracy is associated with voltages difference of distributed generation units (DGs) that is basically attributed to mismatched lines impedance. So the inaccuracy is inevitable. The proposed voltage control strategy contains...
The concept and technologies of fractional calculus have been increasingly applied to model and design circuits and electrical elements. In this work, by combining the principle of harmonic balance and equivalent small parameter method, we develop a new method of steady-state analysis for fractional-order DC-DC converters in discontinuous conduction mode (DCM). The effectiveness of the proposed scheme...
The modular multilevel converters (MMC) has been investigated for a long time and has attracted increasingly more attentions due to its special topology. In order to generate more voltage levels with less power semiconductors for the MMC, this paper presented a novel topology of modular multilevel converters. There are two innovations for the proposed topology. 1. The current limiting inductance in...
This paper proposes a novel quasi-Z source network with multiple switch-inductor (SL) cells and Cockroft-walton (CW) voltage multipliers. The proposed topology can further enhance the boost ability as the increasing of the count of the cascaded SL cells and CW cells. The utilization of CW cells at the output side can greatly reduce the voltage stress of the diodes and active switch, which makes the...
This paper addresses the positioning control problem for a direct-drive linear switched reluctance machine (LSRM) system based on the vectorization technique. The stability conditions for LSRM motion control system are obtained based on Lyapunov stability theory. The positioning controller design method for the closed-loop system is given according to the matrix eigenvalue numerical analysis method...
This paper propose a trajectory tracking control method for the quadrotor helicopter based on backstepping technique. To avoid the increasing complexity of analytically and improve the stability of controllers, the control system is divided into inner and outer loop, named attitude control and position control. The outer is designed as a full-driver controller and the inner is underactuated one. Although...
This paper proposes a PD based trajectory tracking control method with 6-DOF robot manipulator, which can realize the dynamic tracking of a given angle trajectory. The high-precision laser tracker is used to measure the spatial pose, including position and orientation, of tested sample. And the pose sequence is considered as the expected value of the end effector going through. An interpolation method...
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