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.
In many aspects, harmonics will cause a series of problems such as electromagnetic interference (EMI), mechanical vibration and harsh noise. Especially when the amplitude of harmonics is high, more serious problem will arise. For these reasons, this paper has made an analysis of the theory of random carrier modulation and presented a practical random carrier modulation technique which is applied to...
Due to the decrease of azimuth resolution and array gain, the performance of small aperture over the horizon radar (OTHR) is not as good as the conventional OTHR. Therefore, it is necessary to find a new method to improve array performance of small aperture OTHR to satisfy the requirements of target detection. In this paper, conclusions on the performance losses are obtained by deducing the expression...
Now, gait recognition for identification has received more and more attention from biometrics researchers. Gait Energy Image(GEI) is an efficient represent method and Gabor wavelet has many excellent property, so we use the Gabor wavelet to extract the amplitude and phase feature of GEI, research their recognition ability respectively, at last, fusion the two features in rank level to gait recognition...
The fast forward-backward splitting algorithm has been applied to many fields since it was created, such as signal processing, image processing, compressed sensing, model predictive control and so on. However, this doesn't mean that the algorithm converges very fast in the practical problems, especially when applied to the ill-conditions. Thus, it's necessary to speed up the algorithm to make it more...
Most of studies on network capacity focus on the networks in a two-dimensional space. However, with the development of technology, capacity analysis of three-dimensional networks becomes more predictable. Throughput capacity of three-dimensional regular networks are investigated in this paper. The per-node throughput capacity of the networks with omnidirectional antennas are obtained. As directional...
The distributed K-means cluster algorithm which focused on multidimensional data has been widely used. However, the current distributed K-means clustering algorithm uses the Euclidean distance as the similarity degree comparison of multidimensional data, which makes the algorithm divides the data set relatively stiff. Aiming at this problem, we present a distributed k-means clustering algorithm(SPAB-DKMC)...
In order to achieve the fast classification for Ultra-low-frequency (ULF) electron field data in the Space, this paper designs an electric field classifier based on the back-propagation (BP) neural network with extracting the ULF section electric field waveform data of the Wenchuan earthquake, using the statistical methods to obtain four characteristics of the mean value, mean square error, skewness...
Time difference of arrival (TDOA) continuous localization is a challenging area because the need of intermediate variable for traditional localization model. Aiming at solving this difficulty, a TDOA localization model in three-dimension (3-D) space which relates only to the target state is derived and then based on it, a weighted instrumental variable (WIV) algorithm is proposed which uses the pseudo-linear...
A disguise algorithm about DEM data is proposed in this paper, and it is based on matrix transformation and cryptographic algorithm. In this algorithm, a terrain is generated with a parametric surface, which is generated by the two element trigonometric function. The security communication of DEM data is realized through the discretization of the real DEM data and the terrain. Experiments prove that...
Micromachined capacitive inertial sensors embedded in higher order sigma-delta modulator (SDM) have a promising future, especially in high resolution applications. However, the limited performance due to the low dc gain of mechanical sensing element and the stability problem caused by phase-lag are always unavoidable. Previously, researches stabilized higher order electro mechanical SDM (EMSDM) systems...
FM sound sync-broadcasting system can save frequencies resources, expand coverage, improve the audio quality. Technical specification for FM sound sync-broadcasting system (GY/T 154-2000) was published for implementation in December 2000. The most basic technical parameters in standards are the synchronous carrier frequency, the synchronous phase, the synchronous modulation depth and ensure that acceptance...
Spread spectrum (SS) modulation is one of the most commonly used methods for data hiding. However, the capacity of SS-based methods is rather limited. To improve the hiding efficiency, this paper presents a method that employs the parallel combinatory spread spectrum (PCSS), in which the hidden data can be transmitted in parallel with a combination of a few pseudo noise sequences. An informed embedding...
The variable illumination 3D capture system uses kinds of cameras and lighting equipment to acquire the object information in different angles, which greatly enhances the reality of the 3D model under the arbitrary illumination conditions. In practice, the images captured are underexposed and have a low signal-to-noise ratio if the traditional way of the variable illumination is adopted in a large-scale...
The convex combination of two momentum term based algorithms with different momentum factors is an effective solution to highlight the tradeoff between convergence rate and steady-state error of a blind source separation system. As the smoothing factor is chosen in the range from 0 to 1, however, the performance of this convex combination is restricted. In this paper, a novel variable smoothing factor...
To solve the problems of lean, occlusion, and unbalance exposure, a new strategy of facial expression recognition based on template matching is proposed in the paper. The strategy firstly obtains the characteristics of half-facial expressions by using Gabor wavelet, and then calculates the picture's Euclidean distance with the standard library; at last, classify expressions by using the method of...
Extraction speech signals is being more and more important in variety fields such as mobile communication and fire fighter's communication. ICA(Independent Component Analysis) method is based on independence of source signals whose conditions are satisfied in firefighters' speech signals and noise signals. The aim is to restore fire fighter's speech signal from the array of microphone. These microphones...
Batteries have been widely used in the field of electric vehicles. So prediction of the state of health (SOH) is important to the safe and efficient use of them. In this study, SOH is estimated by the generalized regression neural network (GRNN). GRNN is established by the radial basis neurons and linear neurons. The network has the advantages of approximation ability and the learning speed. In this...
Influence on accuracy and computational complexity of numerical simulation by mesh degree is very important in the whole space transient electromagnetic field. During numerical simulation in the whole space transient electromagnetic field with the abnormal body, as a secondary excitation source, the abnormal body has a greater impact on the transient field. Therefore, according to the relationship...
In multichannel audio system, virtual sound source may be produced and rendered at arbitrary directions and locations so the multichannel signals are complicated. Parametric coding methods encode two or more channel signals into a downmix accompanied with spatial parameters, which can provide preferable compression ratio and considerable sound quality in multichannel audio coding. Due to the correlation...
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.