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With the rapid development of science and technology and the growing popularity of computer networks, the scale of network users is gradually expanding, and the behavior of network users is becoming more and more complicated. A large number of studies show that the user's actual interest is closely related to the browsing behavior on the web page. Through the user browsing behavior analysis can obtain...
We developed a strategy for synthesizing perovskite nanofilms and demonstrate a highperformance nanofilm photodetector. This novel synthesis method provides a new platform for exploiting optoelectronic devices based on free-standing perovskite nanofilms with high crystal quality.
The microseismic (MS) monitoring in the coal mining provides a powerful method to identify the coal mine geological hazards as well as to prevent against the illegal mining. The challenge of MS monitoring is to extract characteristics of interest from the collected raw MS signals and locate the MS events using effective algorithms. In order to improve the localization accuracy of microseismic sources,...
Microseismic monitoring technology has broad application prospects in large-scale civil engineering safety monitoring fields, such as tunnels. However, due to the lack of a perfect localization method, the microseismic monitoring system has the large localization error at present. To solve this problem, firstly, we preprocess the chaotic microseismic signal, using power spectrum analysis method to...
The ability to continuously detect the interesting subgraph patterns over dynamic graph-structured data in real time is crucial to many applications. Generally, the edges of such subgraphs have temporal relation. In this paper, the stream model is used to describe the dynamic graph, in which the edges are processed in chronological order. In order to reduce the intermediate results, we propose a topological...
This study aims to meet requirement of rapid detection of the TBM (tunnel boring machine) tool's wear state. To this end, the local region-growing method based on normalized cross-correlation was proposed to detect the block slag on belt conveyor and the least-square method for ellipse fitting was employed to measure the size. Firstly, the monocular color image was decomposed into two gray-scale images...
As the demand for structure healthy monitoring of civil engineering continues to grow at an unprecedented pace, the need for real time remote data compression and transmission systems becomes more prominent. In this paper, aiming at the problem of massive data transmission in the safety monitoring systems of the civil engineering applications, the GPRS wireless transmission terminal is designed to...
A FBG embedded smart composite material, which is capable of measuring temperature and strain beyond the loading bearing missions, has been developed using hot pressing technology. The asymmetric loading induced birefringence which affects the wavelength identification of the embedded FBG has been mitigated by recoating epoxy resin on the grating section. To determine the optimal recoating thickness,...
A method utilizing one Phase-shifted Fiber Bragg Grating (PS-FBG) and adaptive particle swarm optimization (APSO) algorithm has been proposed to simultaneously measure the spatial multiple axial stresses, including axial stress and transversal stress. The swarm success rate based dynamic adaptive strategy for the adjusting of inertia weight has been introduced to balance the exploration and exploitation...
With the rapid development of computer networks, a variety of network applications continue to emerge, resulting in a surge of network data traffic. Therefore, the network congestion becomes more serious. Congestion control is facing many problems, including latency, fairness, stability and so on, especially the instability of the network caused by transmission delay. We introduce the traditional...
In this paper, one fiber Bragg grating (FBG) vibration sensor is proposed and the application of weak signal processing based on Duffing oscillator model in optical fiber vibration sensors is studied. Frequency response and amplitude sensitivity experiments are all carried out to verify the characteristics of this FBG vibration sensor. By calculating the maximum Lyapunov exponent, these experiment...
In this paper, a matrix pencil characteristic equation-based source number estimator is proposed. An enhanced matrix is defined through partition-and-stacking process by the original data on the uniform linear array, and its covariance matrix is computed, which is proved to be a toeplitz conjugate symmetry matrix. The covariance matrix elements are aligned to from a vector. A measurement matrix is...
As a new energy technology, microbial desalination cell (MDC) can not only purify the wastewater, but also can produce electricity. It has attracted the attention of researchers in the field of control in recent years. In this paper, the generalized predictive control (GPC) algorithm for MDC is proposed to control the output current. A linear regression model of MDC is identified based on the recursive...
Device-to-device (D2D) communication has been proposed as a solution for vehicle-to-vehicle (V2V) communication, which has strict requirements on reliability and latency. Previous works on V2V communication typically assume single-antenna users, which ignore the potential of multiple antennas. By contrast, this paper studies an uplink power control problem in multi-antenna V2V underlay cellular networks...
This paper presents an application of the formal method to model and verifies the communication and control for a fleet of collaborative autonomous underwater vehicles (AUV) named as Eco-Dolphin. The fleet includes YellowDolphin, BlueDolphin, and RedDolphin, which are designed to collect environmental data and provide surveillance services in littoral water. The system architecture of the fleet is...
Multi view technology is a hot spot in research of the current display, multiple viewpoints of freedom stereo display technology not only can let the viewer's feel lifelike three-dimensional effect, still can make the viewer from wearing the aid equipment trouble, which makes more and more colleges and universities, research institutes and companies engaged in multiple viewpoints freedom stereo display...
Under the weaker assumption on the drift and diffusion terms, this paper proposes a new parameter-dependent state-feedback controller design scheme for a class of stochastic time delay systems. On the basis of stochastic time delay system stability theory, by tactfully choosing a suitable Lyapunov-Krasovskii functional (LKF), the proposed controller can ensure that the closed-loop system is globally...
PLS is widely used in the quality control process system, but it has poor capability in some strong local nonlinear system for fault diagnosis. To enhance the monitoring ability of such type fault, a novel statistical model based on global plus local projection to latent structures (GPLPLS) is proposed. Firstly, the characteristics and nature of quality-related global and local partial least squares...
A novel on-line auto-tuning PI control algorithm for the superheat of the evaporator is proposed in this paper. A first-order plus dead-time model is firstly employed to describe the system process, and the model parameters are obtained from the robust identification algorithm using the on-line experimental data. Then, a PI controller, whose parameters are tuned by the Ziegler-Nichols method, is designed...
A low-order hybrid model, which can present the transient behaviors of evaporators, is proposed in this paper. The model is derived from the fundamental conversation of energy and mass of the working fluid flowing though the evaporator, while its geometrical dimensions, thermodynamic coefficients that can be considered as constants and some variables that keep small variety during the operation (such...
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