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In this paper, a sliding mode speed control scheme associated with an original fuzzy disturbance observer (FDO) is presented for the permanent-magnet synchronous motor (PMSM) control system with various disturbances. In order to overcome the main drawback of traditional sliding mode control, that is, large control effort and chattering, and meanwhile, enhance the robustness of the system, a FDO with...
Brightness temperature data in Amazon Rainforest, Sahara Desert, and Greenland Plateau are compared between HY-2A Atmospheric Correction Microwave Radiometer (ACMR) and Jason2 Advanced Microwave Radiometer (AMR). The brightness temperature data of the HY-2A ACMR are recalibrated. The brightness temperature recalibration results of the HY-2A ACMR agree well with those of Jason2 AMR. This is submitted...
The technology of 3D reconstruction of medical image can provide more comprehensive and detailed information for doctors. This paper analyses the efficiency of traditional marching cubes(MC) algorithm and its derivative algorithms, puts forward an improved MC algorithm which can improve drawing efficiency by quadratic median approximation method instead of linear interpolation method. With the aid...
In this paper, predictive speed control (PSC) of interior permanent magnet sychonous motor (IPMSM) which is based on finite control set model predictive control (FCS-MPC) is investigated. The predictive speed controller with a cascade-free structure has a excellent dynamic performance. A prediction model with speed compensation is used to predict the future states of IPMSM. Then a cost function with...
This paper presents an investigative work about the direct speed control (DSC) of interior permanent magnet synchronous motor (IPMSM) based on finite control set model predictive control (FCS-MPC). A compensation is applied to the speed prediction model because of the unknown load torque and varied rotary inertia. And a multi-constrained cost function with dynamically adjustable weight factors is...
Gene controls biological character by various proteins that are formed by isoforms. Through alternative splicing, gene can express multiple isoforms. The next generation of high-throughput RNA sequencing has provided facilitation for quantifying isoform expression level. Extensive efforts have been made in stimulating isoform abundance from RNA-Seq data, but the accuracy still needs to be improved...
Shortest-path queries on weighted graphs are an essential operation in computer networks. The performance of such algorithms has become a critical challenge in emerging software-defined networks (SDN), since SDN controllers need to perform a shortest-path query for every flow. Unlike classic solutions (e.g., Dijkstra's algorithm), high-performance shortest-path query algorithms include two stages:...
With the increasing of thermostatically controlled load proportion and the accessing of renewable energy, problems caused by the uncertainty of load becoming non-negligible for load restoration. In this paper, we focus on deal with uncertainty problems of load restoration during the last stage of network reconfiguration. Primarily, Conditional Value-at-Risk (CVaR) is introduced to describe load randomness...
The precise estimation of the frequency of the signal is of great significance in many areas of application. In this paper, a new algorithm for estimating the frequency of one real tone in noise from a block of N uniformly spaced samples is proposed. This algorithm is based on the fundamental principle of the DFT. As a stand-alone algorithm, this estimator provides excellent performance but the computation...
Three-phase voltage-source inverters (VSI) fed induction motor (IM) with space-vector controlled scheme are widely used in industrial applications. The suffered failures will degrade the system performance with output torque ripple and harmonic currents. In this paper, a new diagnosis method is proposed to detect and locate the insulated gate bipolar translator (IGBT) open-circuit fault. Discrete...
The effects of thermal aging and electromigration on the tensile strength and microstructure of SnAgCu micro-interconnection solder joints with different volume were discussed in this paper. The experimental results show that isothermal aging results in coarsening of the microstructure in the solder joint, and electromigration leads to micro-hole or micro-crack in the cathode interface, which bring...
Large amounts of information can be obtained from road images by computer vision. This paper presents a vision-based lane detection algorithm to find the lane curves in each video frame, while a multi-model fuzzy controller is also established to fulfill lane following, which is based on fuzzy logic. In the proposed detecting algorithm, a series of algorithms, including image preprocessing and lane...
There are three retrieval algorithms developed for the HY-2A Atmospheric Correction Microwave Radiometer (ACMR). The validation Results of these retrieval algorithms and corresponding products (the wet tropospheric path delays) are presented. Comparisons are made between HY-2A ACMR and various sources including Jason2 Advanced Microwave Radiometer (AMR), global climatological model (ECMWF).
A new method for Polarimetric Synthetic Aperture Radar (PolSAR) terrain classification based on Deep Sparse Filtering Network (DSFN) is proposed in this paper. It uses a novel deep learning network to learn features from the input raw data automatically. And the spatial information between pixels on PolSAR image is combined into the input data. Moreover, unlike the conventional deep networks, the...
Software-Defined Networking (SDN) has great potentials in changing the fragile and complex enterprise networks. One operational challenge to SDN deployment is the settlement of legacy switches. A hybrid SDN consisting of both SDN and legacy switches may be a tradeoff. Nevertheless most of the current SDN control planes can not handle legacy switches. To overcome this problem, we present HybridFlow,...
A five-leg back-to-back converter-fed induction motor drive, consisted of coupled rectifier and inverter sharing one leg between them, is discussed in this paper. This topology can be applied for fault-tolerant system when one leg of conventional back-to-back converter fails. However, this kind of system poses a two-object control problem. Moreover, the inherent DC bus voltage distribution between...
Four-switch three-phase inverter-fed induction motor drive is very attractive because it can be utilized in fault-to-lerant control to solve the open/short-circuit fault of the six-switch three-phase inverter without redundant power switches. However, the balanced three-phase current collapses due to fluctuation of the dc-link capacitor. Allowing constraints included, the predictive torque control...
Vector controlled motor drives are widely used in industry application areas, usually they contain two current sensors and a speed sensor. A fault diagnosis and reconfiguration structure is proposed in this paper including current sensor measurement errors and sensors open-circuit fault. Sliding windows and special features are designed to real-time detect the measurement errors, compensations are...
In the past decade, Location-Based Social Networks (LBSNs) have attracted attentions from both the academia and industry. All LBSN sites are venue-centric, i.e., each review or check-in must be associated with a venue. Despite the importance of the venues, there still lacks a systematical study on LBSN sites from the venues' perspective. To fill this gap, we conduct a comprehensive study on Dianping,...
Water vapor and cloud liquid water can influence the accuracy of sea surface height that spaceborne altimeter measures. Atmospheric correction microwave radiometer (ACMR) can be used to retrieve the amount of water vapor and cloud liquid water by measuring radiation from atmosphere and earth's surface. HY-2 satellite is a Chinese satellite for ocean dynamic environmental monitoring. ACMR is one payload...
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