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Polarimetric Synthetic Aperture Radar (PolSAR) is an advanced sensor which can achieve echoes from the ship in four different polarization channels. Given a proper weighting vector of each channel in a combination process, the contrast between ships and background can be enhanced which is a huge benefit. In this paper, a new ship detector is proposed based on an automatic way to evaluate the right...
In this paper, we first propose a Quality of Experience (QoE) evaluation model for dynamic adaptive streaming over HTTP (DASH) services. The proposed model predicts the perceived quality of user based on segment media quality, playback continuity and perceptual quality fluctuations caused by bitrate switching. Large quantities of subjective mean-opinion-score (MOS) tests demonstrate that our QoE evaluation...
In order to solve the problem of China's auto industry control right caused by the introduction of foreign capital, based on defining China's auto industry capital structure security, in this paper we construct China's auto industry capital structure security index system containing 6 indexes, identify the index warning limit and index positive management method and finally use the principal component...
A tunable single passband microwave photonic filter (MPF) with compensation for fiber dispersion induced radio frequency (RF) power fading is realized. When the central frequency of the MPF changes the passband amplitude can be kept invariant. The proposed MPF has a tunable range of 0–30 GHz and the rejection ratio exceeds 30 dB.
We have demonstrated a single passband microwave photonic filter (MPF) based on the stimulated Brillouin scattering (SBS). The obtained single passband MPF shows a main to secondary sidelobe ratio (MSSR) of exceeding 50 dB with a center frequency tunable from 0 to 40 GHz, and a full width at half maximum (FWHM) bandwidth of 16 MHz.
In this paper, we propose an unsupervised feature learning method called deep binary descriptor with multi-quantization (DBD-MQ) for visual matching. Existing learning-based binary descriptors such as compact binary face descriptor (CBFD) and DeepBit utilize the rigid sign function for binarization despite of data distributions, thereby suffering from severe quantization loss. In order to address...
Most bilateral teleoperation researches focus on the system stability within time-delays. However, practical teleoperation tasks require high transient performance, such as convergence rate and precision, besides system stability. This paper investigates bilateral teleoperation controller design with transient performances. To ensure the transient performances and system stability simultaneously,...
A multiple hypothesis tracking (MHT) algorithm based on multi-feature fusion is presented in this paper to counter range deception jammings. Sparse decomposition coefficients and bispectrum features are extracted to distinguish the targets and the jammings. A two-stage fusion structure using neural network and Dempster-Shafer evidence theory is designed to implement multi-feature fusion so as to get...
This paper investigates the integrated orbit and attitude modelling and control problem for on-orbit servicing spacecraft. The integrated relative kinematic and dynamic model for the on-orbit servicing spacecraft and the target is established on the base of dual-quaternion. A backstepping control law is proposed, which is improved then in consideration of system uncertainties. Globally asymptotical...
When most individuals driving to the shopping mall choose the parking lot, they put attentions on not only the service levels of the parking lot but also their own personal preferences. Parking is essentially a choice behavior with preference information. The personal preferences consist of social attributes (e.g., gender, age, income, occupation), driving attributes (e.g., vehicle type, vehicle price,...
Using synthetic aperture radar (SAR) for ship detection is a significant application for maritime monitoring and security. Ship detectors depress the disturbance from the sea surface such that the background consistently shows the sea pixels. However, in addition to water, the vast sea also contains other real objects, of which small islands are the most common. In this paper, we investigated the...
In protein-protein interaction networks, proteins combine into macromolecular complexes to execute essential functions in the cells, such as replication, transcription, protein transport. Considering the certain rate of false positive and false negative interactions, we take a confidence probability on interactions and correlate interactions and gene expression data to assign weights to edges in PPI...
TomoSAR, as one of the hot technical topics these years, gives an advanced way to use the single orbit multiple baselines SAR images. Among the many TomoSAR methods, the sparse based spectrum estimator is the most popular one. In this paper, we make use of the truncation version of multiple snapshots of compressive sensing (MCS), called L1-SVD, for retrieving information in the urban area. Compared...
Football videos always appeals to large audiences in recent years. The pitch plays the fundamental role in automatically analyzing the factors in the game. In this paper, a fast pitch detection method based on an improved FCM algorithm and Hough transform is proposed. Firstly, use WFCM clustering algorithm for image processing. Secondly, determine the boundary by Hough transform, and then fill the...
Synthetic Aperture Radar (SAR) is a significant tool to satisfy the growing demand of the maritime vessel traffic. ScanSAR, as an important role of SAR systems with very high imageries swath, is more suitable for the detection issue. In this paper, features of ships on Radarsat-2 ScanSAR imagery are characterized as “Bright-Dark” structure. According to the unique features, a new ship detector based...
We report on a 200W, 2mJ, 25ns MOPA fiber laser, the last stage of which has a hybrid gain fiber composed of large-core-diameter and small-core diameter Yb doped fibers.
A linearly polarized Q-switching large-mode-area photonic crystal fiber laser at 978 nm is demonstrated. Short pulse of 14 ns duration is achieved with 36 dB polarization extinction ratio at 10 kHz repetition rate and 2 W output power.
Due to its extensive and acceptable resolution, the use of scanning synthetic aperture radar (ScanSAR) image for ship detection has become a common application in ocean monitoring studies. In this paper, a new ScanSAR ship detector, which is based on the Hessian of Laplacian, is proposed. The radar echoes of ships and the antenna gain (AG) phenomenon of the ocean in ScanSAR image are investigated...
This paper presents a depth extraction method based on frequency domain to process the image defocus area-the region can be treated as a degradation model by using optical principle, point spread function (PSF) and Hough transform. The key point is the radius of circle of confusion, to obtain which we proposed two innovation points: an approach for estimating PSF parameters based on Hough Transform;...
This paper is to illustrate the importance and the existing problems of Educational Informatization of higher medical universities. According to the requirements of new biopsychosocial medical model and medical education, a creative teaching resources platform which is based on the information technology (IT), the internet transmission media and integrating clinical education resources from various...
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