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Low-dropout voltage regulator (LDO) is widely used in up-to-date electrical systems but with severe EMC problems. Its susceptibility prediction has become one of the major concerns both of IC suppliers before fabrication to avoid redesign cost and customers before real application to reduce incompatible. This paper presents a LDO susceptibility modeling study including IEC standard modeling flow and...
This paper proposes an alternative solution to reduce torque ripple and high-order harmonics of back electromotive force (EMF) for permanent-magnet synchronous motor (PMSM) design. Inspired by the step-skewed rotor (SSR), this method divides pole shoes into several segments axially and rotates with an appropriate angle circumferentially to structure an approximate skewed rotor. Specially, different...
To investigate the best frequency for a microwave reaction application, a frequency reconfigurable microwave reaction cavity based on the concept of quarter-wave coaxial cavity resonator is proposed and designed. It is able to resonate at different frequency within the bandwidth of 500∼1000 MHz by only adjusting the length of the inner conductor and the depth of the feeding structure. This implies...
Manifold learning could effectively represent human action which has Non-linear characteristics. Isometric Mapping (ISOMAP) is a classic unsupervised algorithm of manifold learning. However, ISOMAP couldn't work well for the data with the class priori information. Moreover, the computational complexity of dimension reduction to the new data point is too high to be used in real time. Considering two...
A new dynamic frame slotted ALOHA algorithm used in Radio Frequency Identification (RFID) systems is presented in this paper. An effective tag-grouping method is proposed in the algorithm. Theoretical analysis shows that the tag-grouping method can disperse tags quickly and evenly. Based on tag grouping, a reader in RFID system can identify tags group by group. The simulation results show that the...
In the applications of hybrid electrical vehicle (HEV) and electrical vehicle (EV) power systems, the permanent magnet synchronous machines (PMSM) provide better torque generating capabilities, higher power density and higher power conversion efficiency. This paper develops the permanent magnet synchronous generator (PMSG) drive for the electrical vehicle. The PMSM can be driven in both motor mode...
A 4–40MHz fifth-order gain-adjustable LPF utilizing digital-assisted calibration for direct-conversion DVB-S/S2 & ABS-S TV tuners has been implemented in 0.13μm CMOS technology. The bandwidth of the filter can be changed from 4−16MHz with 0.5MHz step and 17−40MHz with 1MHz. The calibration includes automatic DC-offset Calibration (DCOC) and Automatic Frequency Tuning (AFT) to achieve less than...
A new security strategy based on Galois linear feedback shift register structure is proposed in this paper. To make the VLFSR's details unpredictable from the key stream out, a novel circular variable polynomial and independent feedback loop is presented and designed. Through the cryptanalysis, the mutual authentication requirements between Reader and Tag is met, as well as increases the security...
In this paper, the key technologies of China military RFID air interface protocol: “Air interface for military radio frequency identification Part 1:800/900MHz parameters”, were analyzed firstly. Then, based on NI software-defined radio (SDR) platform, the RFID air interface protocol was realized through the communication between the reader emulator and tag emulator. This also lays a foundation for...
The sparse representation classifier has achieved interesting classification results in face recognition. In speaker identification task, we intend to form an over complete dictionary using the GMM supervector for the training data. Then, the sparse representation is shaped as a sparsity-restricted robust regression problem. By supposing that the representation residuary and the representation coefficient...
Cognitive research indicates that multimedia information have benefits over text-only information by means of intuitive and vivid expression. In this paper, we introduce a novel multimedia Question Answering approach to enrich text answers with image and video information. Especially, we propose a robust multivariate reranking algorithm which adopts a squared hinge loss function for learning ranking...
At first, the framework of alarm pretreatment system of optical transport network is discussed, then three function blocks of alarm pretreatment system are analyzed, they are alarm information database-, network topology information database and alarm correlation analysis. At last, Delphi 7.0 and SQL Server 2000 are used to achieve alarm pretreatment system of optical transport network; and experiment...
In radio frequency identification (RFID) systems, tag collision arbitration is a significant issue for fast tag identification. In this paper, the author proposed an improved anti-collision algorithm, namely Dynamic Disperse and Shrink algorithm, based on the analysis of binary tree anti-collision algorithm. In the algorithm, both 0-branch tags and 1-branch tags are hashed. Thus, when 0-branch tag...
Most previous research on document classification assigned only one or two category tags to each document. Furthermore, the tagged items are rarely incorporated into their topic groups in subsequent classification work though it would conceivably enhance classification efficiency. with the modularity method, this research incrementally adds the classified documents to their topic groups after the...
To explore the potential of thermal infrared hyperspecra for retrieving soil moisture, the soil was measured using a 102F Fourier Transform Infrared Spectroradiometer(FTIR), and the soil's emissivity spectra were then obtained with the Iterative Spectrally Smooth Temperature/Emissivity Separation Algorithm (ISSTES). Additionally, the spectral characteristics for different soil moisture were briefly...
This paper describers the history and trends of application about TPMS, mainly introduces the basic principles of transmitter based TPMS, the structure of the system, as well as the main features of components. To solve the problem of reducing the power of the direct-type TPMS system from the engineering Application Perspective, It focuses on software processes of achieving low power consumption and...
The amount of echo data is huge in SAR imaging with high resolution. To solve this problem, the imaging method with compressed SAR echo data based on Compressed Sensing is proposed. Firstly, the echo measurement matrix is designed by the waveform-matched rules. Secondly, when the target scene is sparse after the discrete cosine transform, the sparse transformed matrix is obtained by constructing the...
This paper proposes a key management mechanism by DH distributed key tree for the DHT network, which is based on the DHT network routing mechanism and network topology structure. The scheme uses the DH algorithm for key agreement, to ensure that the nodes in the DHT network are able to maintain a limited number of keys, and on this basis to complete encryption of routing messages across the network...
Relevance feedback is a quite effective approach to improve performance for image retrieval. Recently, active learning method has attracted much attention due to its capability of alleviating the burden of labeling in relevance feedback. However, most of the traditional studies focus on single sample selection in each feedback which needs heavy computational cost in practice. In this paper, we presents...
We put forward a contourlet transform and PCNN based image enhancement algorithm in this paper. This method overcomes the traditional wavelet transform's deficiencies in sparse representing inseparable semantic details of images, such as multidirectional edges. Firstly the images are decomposed into multi-directional and multi-scale contour segments by the contourlet transform, the directions of the...
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