The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Compressive spectral clustering (CSC) efficiently leverages graph filter and random sampling techniques to speed up clustering process. However, we find that CSC algorithm suffers from two main problems: i) The direct use of the dichotomy and eigencount techniques for estimating laplacian matrix’s k-th eigenvalue is expensive. ii) The computation of polynomial approximation repeats in each iteration...
This paper investigates the semi-global practical stabilization for second-order nonlinear systems subject to unknown control coefficients and completely unknown nonlinear function. In order to achieve the control objective, a state feedback controller is firstly constructed to ensure that systems under consideration satisfy uniform Lyapunov property. Then, based on output feedback domination method,...
Triple-comb pulses generated from one multi-wavelength mode-locked laser enable real-time microwave frequency measurement without the ‘dead-band’ limitation in previous dual-comb schemes. 1.5∗10−10 measurement accuracy is achieved at 20 GHz using a low-cost, compact fiber-optic setup.
We show both asynchronous and synchronous, dual-wavelength femtosecond pulse generation from an SWNT-mode-locked fiber laser by tailoring the intracavity anomalous dispersion, suggesting the effect of the mode-locker on pulse synchronization in the presence of dispersion.
A simple, self-starting and stable dual-wavelength-comb mode-locked fiber laser is realized with a dual-mode-fiber-based filter. The cost-effective, multimode interference fiber filter with low spectral modulation depth enables relatively wide spectral bandwidths in the mode-locking windows.
THz dual-comb spectroscopy using a free-running, dual-wavelength-comb fiber laser is demonstrated for highly cost-effective and compact THz spectroscopy systems while maintaining its high spectroscopic performance.
According to the noise and overlapping characteristics of agricultural irrigation water quality monitoring data for the comprehensive evaluation may bring about the boundary fuzzy problem. This paper proposes an improved Genetic Algorithm (GA) to avoid premature convergence, the global optimal solution of the function of the Projection Pursuit (PP) function is used as the comprehensive evaluation...
We analyze the influences of non-Kolmogorov turbulence and source parameters on beam wander of Bessel-Gaussian (BG) beams in the atmosphere. BG vortex beams with larger topological charge and beam parameter η can better mitigate the turbulence effects on beam wander than BG non-vortex beams. Both inner- and outer-scale effects on beam wander should be considered when BG beam goes through atmosphere...
In this work, we report the program-erase operation of a nonvolatile charge trapping memory base on a thin film transistor. The transistor is composed of an ultra-thin zinc tin oxide (ZTO) semiconductor layer and an Al2O3/Ni-nanocrystals/SiO2 dielectric stack. The threshold voltage (VTH), sub-threshold swing, ION/IOFF ratio of the as-fabricated device are 1.8 V, 0.40 V/decade and ∼107, respectively...
Delay-tolerant networks consist of mobile nodes that communicate in unscheduled opportunity without network infrastructure support. When mobile nodes move in highly dynamic networks, they suffer from many challenging issues such as broken network topology and transient connectivity among nodes. In this paper, we propose a geo-routing scheme with an angle-based decision policy (GRAD) for message delivery...
Asynchronous-optical-sampling THz-TDS using a free-running, dual-wavelength mode-locked fiber laser is demonstrated for highly cost-effective and compact THz spectrometer while maintaining its high spectroscopic performance.
A hypersonic vehicle is covered by an inhomogeneous and time-varying plasma sheath when it reenters the Earth's atmosphere. To investigate the effects of scattering in the plasma sheath on electromagnetic (EM) wave, the JE convolution-finite-difference time-domain algorithm is applied to three-dimensional time and spatially inhomogeneous plasma. The radar cross-section (RCS) of plasma sheath is analyzed...
Based on the financial security index calculated in the method of principal component analysis, this paper applies the model of BP neural network to test the result and then puts forward the early warning of Chinese financial security position in the future. In addition, the article gives some following suggestions for the early warning of financial risks: we shall reform the current financial regulation...
In order to improve the efficiency of wheel size detection and the measurement accuracy, an online wheel size detecting technology based on 2D laser displacement sensors is proposed. The 2D laser displacement sensors are installed on both sides of the track, then scan the wheel tread of the detected region dynamically. Next, use coordinate transformation and data fusion to preprocess the collected...
This paper presents a novel sliding mode control method for a class of second-order systems subject to unmatched disturbances to ensure finite-time exact tracking and disturbance rejection. Firstly, a feedback domination approach with a dynamic disturbance compensation is developed based on a finite-time disturbance observer. Secondly, a new nonlinear sliding manifold is proposed by virtue of a virtual...
A new fuzzy control approach of STATCOM has been designed according to micro-genetic algorithm in this paper. Initial membership functions and control rules of FLC were fast obtained by fuzzy toolbox of MATLAB and selecting input and output observed signals, membership functions and control rules are optimized simultaneously by micro-GA. Simulation experiments for four machines power system with STATCOM...
We establish the rate region of an extended Gray-Wyner system for 2-DMS (X, Y) with two additional decoders having complementary causal side information. This extension is interesting because in addition to the operationally significant extreme points of the Gray-Wyner rate region, which include Wyner's common information, Gåcs-Körner common information and information bottleneck, the rate region...
This paper shows that for any random variables X and Y, it is possible to represent Y as a function of (X, Z) such that Z is independent of X and I(X; Z| Y) ≤ log(I(X; Y)+1)+4. We use this strong functional representation lemma (SFRL) to establish a tighter bound on the rate needed for one-shot exact channel simulation than was previously established by Harsha et. al., and to establish achievability...
In this paper, we use a advanced method called Faster R-CNN to detect traffic signs. This new method represents the highest level in object recognition, which don't need to extract image feature manually anymore and can segment image to get candidate region proposals automatically. Our experiment is based on a traffic sign detection competition in 2016 by CCF and UISEE company. The mAP(mean average...
In the power market, the power generation and consumption behavior will be more difficult to capture and predict than in the environment of monopolistic buying and selling model. Smart grid planning and operation is going to be challenged. In order to adapt to the new situation, it is necessary to actively explore some innovative load forecasting methods. The improved method of intelligent load forecasting...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.