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.
The margin trading has entered the pilot run phase since the March 31st, 2010 in China. Selecting the weighted stock as our sample, empirical select the SSE 50 Index as the research object, set suitable time dummy variables, test the impacts of the margin trading to the volatility of the A share stock market in the ups and downs of the stock market via EGARCH and VAR model. The empirical results shows...
This paper presents an active fault-tolerant control scheme for a quadrotor unmanned helicopter with velocity sensor faults. A two-level control scheme is designed to guarantee the trajectory following of the quadrotor when there are no faults. The control scheme consists of an external-loop Proportion Differentiation (PD) control law and an internal-loop Proportion Integration Differentiation (PID)...
Target tracking is one of the most important applications for wireless sensor networks (WSNs). It is usually assumed that the knowledge of the sensor nodes' position is known precisely. However, practically nodes are randomly deployed without prior knowledge about their own positions. In this situation, simultaneous localization and tracking (SLAT) is necessary and is receiving more and more research...
First, motion characteristics of near space hypersonic targets are given and the moving model for aircrafts is built. Then, according to the disadvantage which time sample is a constant when tracking hypersonic targets, an adaptive tracking algorithm of time samples is proposed. This algorithm used the recursion formula method in real time and mixed Singer model with algorithm of IMM. Simulation shows...
In this paper, we present an automatic method to remove shadows in light field images. Taking into account the internal structure of the light field data, depth map of the captured scene is extracted to calculate the surface normal. Using nonlocal matching by combining chromaticity, normal and spatial location information in an anisotropic window, the shadow confidence of each pixel is established...
This paper presents a model to describe I–V properties of Schottky contacts to high resistivity semiconductors, such as CdTe, CdZnTe, TlBr and so on, when depletion region width is less than the crystal thickness. Effects of non-depletion region on dark current are considered in this model. I–V curves of CdZnTe radiation detectors are fitted quite well with this model. Space charge concentration,...
To save energy, solar vehicle have come into being. Therefore, the study of photovoltaic maximum power point tracking is necessary. Traditional photovoltaic maximum power point tracking (MPPT) algorithm such as constant voltage algorithm can not track the maximum power point quickly and accurately. Operation voltage can not be adjusted rapidly with environmental changes when using conductance adding...
In this paper, we discuss the existence of solutions for networks of nonlinear parametrically forced oscillators. We deals with one type of nonlinear coupled system from the studying of the honeycomb sandwich plate. Based on the Implicit Function Theorem, the periodic orbit of the coupled system are derived by the hyperbolicity condition. The method of Poincare map is utilized to obtain solutions...
Rapid development in genomics in recent years has allowed the simultaneous measurement of the expression levels of thousands of genes using DNA microarrays. This has offered tremendous potential for growth in our understanding of the pathophysiology of many diseases. When microarray studies also contain information about an outcome variable such as time to an event or death, one of the goals of an...
This article describes the two important concepts in the gray theory that is the gray relational analysis and the gray model. It establishes the GM(1,2) model between extraction rate index and the other four factors that is temperature, feed water ratio, PH value and the time in a wheat bran extract polysaccharide, and provides with a new scientific analysis methods for Food Processing Industry.
Spatial data balancing distribution can evidently improve the performance of parallel spatial database in shared nothing parallel architecture. Considering spatial locality and unstructured variable length characteristics of spatial data, this paper proposes a dynamic spatial data balancing distribution method under shared nothing parallel database environment. By using Hilbert ordering code to keep...
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.