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.
Infrared (IR) ship image segmentation is a challenging task due to defects of IR images, such as low-contrast, sea clutters, noises and etc. Aiming to solve this problem, we propose a multiple features based IR ship image segmentation method using fuzzy inference system (FIS). Because of complexness of the low-contrast IR image, the ship target cannot be segmented by only one kind of feature. Thus...
The conducted EMI simulation plays an important part in the SMPS in the product design. The analysis of common mode noise is much more complex than differential mode noise. The CE simulation accuracy depends on the accuracy of CM mode noise. CM noises are determined by the electric coupling between the voltage jump point and the ground. Traditional the CM models of the electric coupling between the...
In this paper, we propose a chaotic-based random stepped frequency radar (CRSFR) applicable to wideband imaging. CRSFR provides faster matched processing via sequence rearrangement of AD sampling as compared with conventional random stepped frequency radar (RSFR). Our analysis shows that the presented radar system not only achieves a rapid matched filtering for range profiles without random noise...
In this paper, we propose a new physical layer network coding (PNC) scheme based on rateless coding for two-way relay systems which consist of two end nodes and one relay. The two-way relay channel is studied from a new perspective of end-to-end channel equivalence, and a novel end-to-end demodulator is proposed based on the resultant end-to-end equivalent channel. Unlike the conventional demodulator...
The paper reports and demonstrates a computationally efficient method for machine fault detection in industrial turbine systems. Empirical mode decomposition (EMD) and Savitzky-Golay smoothing filters are used for signal denoising, with a resulting noise index being developed. By comparing the noise index with a power index (also derived in the paper), obtained from the detection of transients using...
A multi-frequency, ground-based microwave radiometer (MWR) for ocean remote sensing has been designed and developed in this paper. It will be used on the offshore oil platform and provide atmospheric soundings of physical temperature and liquid water vapor using channels in the oxygen resonance band (6.8GHz) and water vapor resonance band (23.8GHz). The other channels at 10.7GHz, 18.7GHz and 37GHz...
Because of belonging to the information of system condition, the noise degree of signal could be utilized to express the difference of system condition. After obtaining the symbolic probability series by the signal time series, the symbol-chaos characteristics, which could identify the noise degree of signal, are constructed with the four parameters that are symbolic Shannon entropy, symbolic Kolmogorov...
Cluster analysis of gene expression data is one of the most useful tools for identifying biologically relevant groups of genes, however, gene expression data suffer severely from the problems of measurement noise, dimension curse, high redundancy between genes, and the functional annotation of genes is incomplete and imprecise. These properties lead to most of the traditional clustering algorithms...
The boundary of land and water in a remote sensing image is defined as water front. Picking up the water front plays an important role in comprehensive management of waterline, strengthening of the ability in resisting nature disaster, and the research of waterline's environmental change. Using RS methods to pick up water front has advantages of wide-range, high-precision, and ability of dynamic monitoring...
SAR (synthetic aperture radar) images are strongly disturbed by speckle noises, which brings difficulty to the segmentation of the SAR images. Some model-based SAR image segmentation approaches (such as the Markov random field model, fractal model) are too complex and time consuming. We propose an new method to segment the SAR images fast in this paper. First we transform the original SAR intensity...
In this study, a modified topology-adaptive snake (T-snake) is proposed for the segmentation of ultrasound image. The algorithm was improved as follows. First, the image is decomposed in the place which has offset from pixel's position while snake points are in pixel's position. This will reduce the task during calculating intersections between contour and ACID grid. Second, the rule to process topology...
In this paper, we consider blind interference suppression in IR UWB communication system, and the means of a statistical technique called independent component analysis (ICA), taken as a solution for the coexistence of impulse-radio Ultra-wideband (IR-UWB) systems with other wireless systems was studied. Particularly for the evaluation of the system performance, tone, multiton, and partial-band interference...
Influence of production cost on export price is always the hot topic of foreign trade research. Previous researches just use original series to establish models but not fully discover information content of time series signals. Taking China's citrus trade for example, the paper uses wavelet analysis to decompose production cost and export price into four series, which are trend, cycle, volatility...
Interaction between world import price and Chinese export price can reflect the openness of Chinese market. Firstly, the paper uses multiresolution analysis to analyze price signal and decomposes them into approximations and details, and then eliminates noise in original signal through reconstructing. Finally, the paper analyzes interaction between world import price and Chinese export price of horticulture...
In multilevel pulse amplitude modulation (PAM) and quadrature amplitude modulation (QAM) systems, there is a strong demand for a reliable and precise timing phase provided by the timing recovery circuit. However, reducing timing phase jitter just by narrowing the bandwidth of the timing recovery loop will decrease the capability of tracking the time variant channel. To avoid this drawback, the only...
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.