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.
A combinational method for calculation of dynamic parameters of a round rotor synchronous generator in an 80 MVA, 10.5 KV power plant based on synchronous reactance calculation from phasor measurements and using rated value of control room signals is developed in this paper. The results of this analytical method, in comparison with other methods show the efficiency and accuracy of the proposed method.
This paper proposed a reliability evaluation algorithm for distributed generating system based on sequential state duration sampling method. The power output fluctuation of distributed resources, chemical reaction constraint of energy storage device, and the power exchange strategy with the utility grid are taken into consideration. The method produces the time-varied status of all the elements in...
This paper proposes a method to localize an offshore pollutant source in lakes. The concentration of pollutant is measured periodically over time by sensor nodes distributed spatially. The location of the pollutant source is estimated by using unscented Kalman (UKF) spatial-temporal filtering approach when new temporal and spatial concentration measurements are obtained. In simulations, we compare...
Cable-driven parallel robots with flexible spring spine were present to mimic a human neck. The fixed base and moving platform of the robots are connected by cables and a compression spring. The spring serves as cervical spine to support and facilitate the motion of moving platform corresponding to human head. The cables serve as the muscles around human neck to drive the robot. The bending motion...
Node localization of wireless sensor network is a hot topic, but current algorithms of 3D wireless sensor node localization are not accurate enough. In this paper, the DR-MDS algorithm is proposed, DR-MDS algorithm mainly calibrates the coordinates of nodes and the ranging of nodes based on multidimensional scaling, it calculates the distance between any nodes exactly according to the hexahedral measurement,...
Due to the great damage to widely utilized flexible structures in ocean engineering, vortex-induced vibration (VIV) of such long flexible marine structures is still a hot issue that needs more theoretical research, and CFD techniques become gradually indispensable to study the VIV problem. In this paper, two-dimensional Reynolds-averaged Navier-Stokes (RANS) equations are adopted to investigate transverse...
A variety of measurement methods have been developed to obtain positions of nodes in wireless networks. However, most of existing positioning methods can only use limited types of measurement. These algorithms fail to exploit arbitrary measurement methods to improve the accuracy of positioning. In this paper, we propose a high-accuracy positioning algorithm which can utilize unlimited types of measurement...
Automatic text summarization is an important and useful research area in natural language processing and information retrieval. Most of current approaches for text summarization do not make full use of human reading process. This paper proposes a multi-document scanning mechanism by simulating human reading process. The mechanism simulates human memory of words, association between words and three...
This paper proposes a novel scheme that considers the data hiding with sub sampling and compressive sensing. We utilize the characteristics of compressive sensing, sparsity and random projection, to embed secret data in the observation domain of the sparse image obtained through compressive sensing. The high bit correction rate (BCR) in experiments shows the high accuracy of our proposed method.
Multiple-shot person re-identification tackles the problem to build the correspondences between sets of human images obtained from distributed cameras. It is challenging due to large within-class variations and small between-class differences, caused by the changing of human appearance and environment. Existing methods for addressing this issue include designing the representation to capture the within-set...
Time series analysis is to explain correlation and the main features of the data in chronological order by using appropriate statistical models. Since the past electricity generated sequence in China shows a strong seasonal variations and several values for January are lost in recent years, estimating the missing values is an important task before building a model. This paper will estimate the missing...
Transition behavior in large deflection of un-symmetrically layered piezoelectric plate under pretension due to lateral load is studied. von Karman plate theory for large deflection is utilized and extended to the case of an un-symmetrically layered plate including a piezoelectric layer. The derived governing equations are simplified by neglecting the arising nonlinear terms for a linear consideration,...
It has been proven that the batch renewal process is the least biased choice of traffic process given the infinite sets of measures of the traffic correlation, (i.e. indices of dispersion, covariances or correlation functions) in the discrete time domain. The same conclusion is expected to hold in the continuous time domain. That motivates the study and comparison of similar queues, fed by batch renewal...
The scenes of video sequence are very complex, different measures must be taken to solve the jitter of video sequence. Refer to the scene of big target and small background, block matching based on sum of absolute differences (SAD) algorithm is chosen after the comparison of different methods because of its good matching result and less computation. Then full search (FS) method is used to find the...
In order to understand the combustion condition of the opposed jetting combustor in different flow conditions, a non-premixed combustor with opposed methane jets was studied in this paper by using the commercial fluid dynamic software based in N-S equation. It was found that, in the non-premixed combustor, when the velocity of methane remain unchanged, the flame moved to downstream with the air velocity...
The coupled Klein-Gordon-Schrödinger equations is a classical model which describes the interaction between conservative complex neutron field and neutral meson Yukawa in quantum field theory. In this paper, the traveling wave solutions involving parameters of the Klein-Gordon-Schrödinger equations are derived by using the G′/G-expansion method proposed recently, when the parameters are taken as special...
In this paper, Poly flow software is used to calculate the isothermal flow of three model fluids in contraction channel. The streamline contours, the speed contours and the pressure contours are drawn. Great efforts were put into further study of flow properties. As Weissenberg number (We)increasing, the vortex exists in the corner of contraction becomes bigger, the velocity contour is closer to the...
To achieve automatic retractable tail frame of scraper conveyor, we applied fuzzy control theory to the hydraulic system of the retractable tail frame, established transfer function model of electromagnetic valve-controlling-hydraulic cylinder, designed fuzzy controller, and carried out simulation of the system using SIMULINK in this paper. Through simulation, we compared the dynamic performance of...
In order to solve the problems of low efficiency and premature convergence, an improved constriction factor particle swarm optimization algorithm, abbreviated to ICFPSO, was proposed in this paper. Position and speed factors were introduced as two new parameters to judge the stagnation of particles. For each individual, when the distance between its position and the current global optimum was less...
In this paper a multiphase image classification model based on level set method is presented. In recent years many classification algorithms based on level set method have been proposed for image classification. However, all of them have defects to some degree, such as parameters estimation and re-initialization of level set functions. To solve this problem, a new model including parameters estimation...
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.