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This paper investigates the secrecy performance of a full-duplex relaying (FDR) system with a full-duplex (FD) receiver. A novel cooperative jamming protocol is proposed to improve physical layer security, where the FD receiver sends interference to the eavesdropper to degrade its received signal-to-noise ratio when receiving signals from the relay and the source. Taking the residual self-interference...
Analyzer-based imaging (ABI) belongs to a broader family of phase-contrast (PC) X-ray imaging modalities. Unlike the conventional X-ray radiography, which measures only X-ray absorption, in PC imaging one can also measure the X-rays refraction and scatter properties of the imaged object. It has been shown that refraction imaging provide a better contrast when imaging the soft tissue than the traditional...
The effect of antenna rotation on angle-error sensing during coherent integration in mechanical scanning radar is investigated. When radar is working in scanning mode, the monopulse ratio of the target estimated in range-doppler domain is demonstrated to be a synthesis of the instantaneous monopulse ratios of each pulse. Thus, it is inappropriate to sense the angle-error with the curve of monopulse...
A multi-target joint estimation method for radar calibration based on AIS is proposed in this paper. Using the AIS with higher precision, such method could help to estimates the bias of radar. To do such, based on the multi-target track data, firstly the rough association of targets is needed, after which the temporal and space alignment method is used to generate the error sequence of radar. With...
With nuclear power generation increasing, power system peak load situation is becoming more and more serious. It is very important to study the joint generation dispatching issue of power grid for nuclear power peaking. Due to the anti peaking characteristics of wind power output, power load peak valley difference further increases, and thus it exacerbates the difficulty of peak load regulation in...
A wearable microwave head imaging is proposed for medical applications, namely stroke and cancer detection. The wearable device in a hat-like structure incorporates an array of flexible ultra-wideband antenna. The antenna array consists of 8 monopole antenna elements which act as multi-static radar. A lossy dielectric absorber is embedded inside the hat to improve the directivity of the antenna. The...
We proposed a cylindrical lens telescope tilted pulse front pumping scheme for high energy terahertz pulse generation. The optimum pump laser spectral bandwidth and crystal cooling temperature for OR in LN crystal were researched systematically. Excitated by 800-nm laser, more than 0.19 mJ energy and 0.27% efficiency terahertz pulses generation was demonstrated with the optimum bandwidth pumping and...
The new quad-tree structure was adopt by High Efficiency Video Coding (HEVC) to partition the Coding Unit (CU). It improved compression efficiency while increased the computational complexity. This paper analysis the percentage of CU depth, the coding time of CU depth and the relationship between the CU depth and the visual saliency. A complexity control algorithm for HEVC with the visual saliency...
Topic correlations are common in real-world textual information. However, classic topic modeling isn't able to model the correlations among topics because of a single distribution over topics in each document. Therefore, hierarchical topic modeling is designed to relax this restriction. In this paper, hierarchical topic modeling is summarized by analysis of existing studies, especially, two important...
Silver nano-particles (Ag NPs) Pastes has been attracted attention in recent years, and had achieved great success, such as sintered at low temperature and got high shear strength. However, few people pay attention to the substrate nanocrystallization, herein, with the method of wet etching, we got nanostructure substrate of single crystal copper. Following, measured the wetting angle (H2O) and sintered...
Recently, iBeacon is popular used in many fields to push notification to visitors or customers by smart phone APP installed beforehand. Local culture protection organization, such as museum, historic relics park, etc., has the task to disseminate local culture via new IT. iBeacon and smart phone APP, two hotspots research, can be used to push and illustrate local culture information. This research...
Nowadays, every country pay attention to environment protection, so study on environmental monitoring management system (EMMS) will play more important role. This study integrated the big data technology into EMMS. First, it describes the traditional EMMS which has basic functions. Next it introduced big data technologies and analyzed EMMS system structure integrating with big data and gives an actual...
An adaptive iterative learning control (AILC) is proposed to release the requirement of repetitiveness for a class of multiple-input multiple-output nonlinear systems. Based on high-order internal model, the time-iteration-varying law of parametric uncertainty is expressed. Furthermore, reference trajectory and initial state are varying from iteration to iteration randomly. The asymptotic convergence...
MOOC develops quite well and provides a new learning platform, which becomes a prominent representative of big data due to its massive behavior data accumulated in the process of using vast teaching resources. Big data analytics technology based on MOOC is a new research trend and its frame can be involved in four stages: where to get big data (Where), what are data types of MOOC (What), how to deal...
In this paper, we propose an affine invariant image matching algorithm, which is based on the well-known SIFT algorithm. Firstly, we use MSER algorithm to detect affine invariant feature regions. Then covariance matrix of an image patch is used to transform anisotropic patches into isotropic patches by rotating and squeezing. Finally, the affine invariant key points on isotropic patches are detected...
Incremental Attribute Learning (IAL) is a feasible machine learning strategy for solving high-dimensional pattern classification problems. It gradually trains features one by one, which is quite different from those conventional machine learning approaches where features are trained in one batch. Preprocessing, such as feature selection, feature ordering and feature extraction, has been verified as...
Research the nitrogen cycling in agricultural ecosystem and quantitative analysis of the sources and destinations of nitrogen are important for the reasonable application of nitrogen fertilizer and promotion of the agricultural sustainability. The trial was aimed to monitor and assess nitrogen cycling and balance in maize monoculture agro-ecosystem in northeast China black soil. Ammonia volatilization,...
In this paper, we propose a multi-way projections-based reconstruction method for noise reduction of hyperspectral image (HSI). Core ideas of the proposed method are twofold: 1) the original HSI is partitioned into many small three-dimensional (3D) patches. Each of the patch is taken as a third-order tensor, on which compressive multi-way measurements are performed; 2) denoised patches are produced...
Welding robots have become increasingly intelligent, but they cannot possibly carry out any welding operation entirely by themselves and have to be operated by human beings. The paper serves as a useful source of information on standards developed for qualification of robotic welding personnel and it also touches on the robotic welding safety issues.
Mining activities has caused long-term change in land surface and hydrological cycle. Accurate information of vegetation structure is important for assessing how mining activities affect ecosystem in mining areas. A remote sensing method based on vegetation cover monitoring and assessment by using Landsat data sets with the temporal coverage from 1989 to 2015 was presented and applied to the Pingshuo...
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