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.
Evaporation duct has strong impacts on the performance of marine radar and communication systems. Evaporation duct channel is a promising channel for marine high capacity data transmission. Wave propagation models and evaporation duct models are well studied, and statistical features of duct channel has been observed. However, the work on the physical model of small-scale characteristics of evaporation...
Hashing methods have proven to be useful for a variety of tasks and have attracted extensive attention in recent years. Various hashing approaches have been proposed to capture similarities between textual, visual, and cross-media information. However, most of the existing works use a bag-of-words methods to represent textual information. Since words with different forms may have similar meaning,...
Link prediction in complex network often focuses on the single network in many fields and develops a lot of methods. However, the relationship between two dependent networks with specific global structure has hardly caught attention, but only the local topology analysis. In this paper, we aim to infer the correlation of two high dimensional dependent networks based on the similar nodes' attributes...
High-dimensional classification is a common problem in bio-informatics and medicine science. Usually the number of feature is thousands or more but the sample size is much smaller which presents challenge for pattern recognition in computational biology. In this paper, a statistical sparse independence rule (SSIR) is proposed for high-dimensional disease classification. To make up the weakness of...
In this paper, we study on the blind periodic estimation of the pseudo-noise (PN) sequence in variable-spreading-length (VSL) multi-rate direct-sequence code division multiple access (DS/CDMA) systems. The reprocessing of the power spectrum method which is used to estimate the period of general direct-sequence spread spectrum signals is extended to solve the periodic estimation of the PN sequence...
Differential Chaos Shift Keying (DCSK) employs noncoherent demodulation technology and it's unnecessary for the receiver to generate synchronous chaotic signals at the receiving end. The structure of DCSK is simple and has good anti-noise performance. However, the security performance of DCSK is not enough, and it is easier to be cracked. For the above problems, a novel QAM-DCSK system was proposed...
It is valuable to segment carotid atherosclerotic plaques in contrast-enhanced ultrasound (CEUS) images. Traditional methods for plaque segmentation neglect the temporal information in video images, and it limits the accuracy of the segmentation. We propose an algorithm for accurate segmentation of plaques in CEUS images using spatial-temporal analysis and snakes. First, the spatial correlation of...
The spatial rainfall is one of the key inputs for the distributed hydrological model, and their precisions heavily affect the accuracy of streamflow predictions from a hydrological model. Satellite-based rainfall products are expected to offer an alternative to ground based rainfall estimates in the present and the foreseeable future. So, the present study mainly deals with the comparison between...
Under the assumption that the image information is determined mostly by the scene illumination and the objects structure, a new clutter metric, named the relative target complexity based clutter metric, for human visual systems is presented in this paper. The average intensity and the target complexity, independent of each other, are used to represent the image signal in the new metric. And its promise...
The main objective of this paper is to analyze models, techniques, algorithms and infrastructures needed to complete decentralized data fusion. It is often to use the Simple Tracking Fusion Algorithm in decentralized data fusion for Multi-sensor. But that algorithm is on the hypothesis that the output of each local filter is uncorrelated. If the fusion result is given back to each local filter, the...
Aimed at the complexity of the scheme selection of the cooling and heating sources for air-conditioning system, this paper presents a new method according to fuzzy matter-element. First, the matter-element of optimal subordinate degree and relational grade is established, then calculating the coefficient of weight by standard deviation, at last, the optimal scheme is selected by the relational grade...
A 2D intra prediction with geometrical manipulations (2DIP) was proposed in [Yai, et al; 2008 ] to enhance the intra coding performance of H.264/AVC. However, the complexity of 2DIP is high if the full search scheme is used. In this work, we investigate ways to speed up the intra prediction mode decision for 2DIP. To achieve this, we first conduct a block correlation analysis that reveals the unique...
Since recent studies are concentrating on negative experience such as ??lostness?? and ??disorientation??, we emphasized the importance of positive experience in the paper. To investigate which behaviour is related to the user satisfaction, this paper examines the relationship between operational measures of user behaviour and users' positive experience. Several measures were used to evaluate the...
This paper presents a novel synchronization scheme that base on Baker Codes autocorrelation property for UWB impulse radio system. Simple threshold detection circuit is used to perform early quantization. An asynchronous pulse capture block is introduced to perform a direct down conversion of the UWB pulses from RF band to baseband. The new scheme provides run time synchronization tracking and resynchronization...
The departure process of a BMAP/MAP/1 queue can be approximated in different ways: as a Markovian arrival process (MAP) or as a matrix-exponential process (MEP).Both approximations are finite truncations (say, with n + 1block levels) of the original departure process and preserve the marginal distribution of the interdeparture times. However, for true batch arrivals, the MAP model matches one more...
In this paper, we propose a new approach for the development of load control policies in autonomic multitier systems. We control system load in a completely new way compared to existing policies: we leverage on the autocorrelation of service times and show that autocorrelation can be used to forecast future service requirements of requests and adaptively control system load. To the best of our knowledge,...
Search engine technology plays an important role in Web information retrieval. However, with Internet information explosion, traditional searching techniques cannot provide satisfactory result due to problems such as huge number of result Web pages, unintuitive ranking, etc. Therefore, the reorganization and post-processing of Web search results have been extensively studied to help user effectively...
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.