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.
To solve the problem that the Mass-to-Drag Ratio of the reentry target can't be extracted stably, a recognition method based on the height when the velocity of reentry target declines is proposed. The method extracts the height when the velocity of reentry target declines, because the air resistance on the light and heavy target is different. Then these two kinds of target with different Mass-to-Drag...
Aiming at the problem of the difficulty in the range alignment of HRRP because of more than one target in the window of radar image, this paper propose a alignment method for multiple targets in the target group by using an image segmentation method. First, we accumulate the HRRP of the target, and get the HRRP process diagram. By calculating the correlation coefficient between each frame of HRRP...
The movement of actual target is non-stationary, usually accompanied by rotation, swing and other non-rigid motion in the process of high speed flight. Adaptive joint time-frequency analysis is available to estimate target's motion characteristics. To solve the problem of complex of parameter estimation in the time-frequency signal decomposition, a method using adaptive chirplet signal decomposition...
This article researches on node importance ranking of multiplex network. Existing node importance ranking methods are amost monoplex network using only single relationship. However, in real life a person often has various relationships, so how to rank nodes of multiplex network is more realistic and meaningful. In this article, we propose a multiplex network node ranking method based on weighted aggregation...
Aiming at the deficiency of the algorithm of the radar simulator echo images generation, a modified algorithm is proposed in this paper. The algorithm converts the geographical coordinates of the shoreline into plane coordinates by the Vincenty's formulae, uses the modified RDP to simplify the shoreline data, uses normal and Rayleigh distribution model to simulate the radar precipitation clutter,...
This paper proposes a fast road signs recognition framework with shape filtering and contour features. We observe the standard road signs and construct two basic feature tables for recognition processing. In road driving images, we transfer the RGB color domain to HSV for the red regions detection firstly. And we obtain candidate regions and decide the kinds of shapes by eliminating the redundant...
The conditions on the coefficient vectors of parametric polynomial minimal surface of arbitrary degree with isothermal paprameter is investigated. From the conditions, polynomial minimal surface of arbitrary degree with shape parameters and elegant properties can be constructed for shape design.
In order to solve the existent problems of incomplete and ambiguous information during the evaluation on the multiple constraints factors of city underground space development and utilization, this paper applies analytic hierarchy process and fuzzy comprehensive evaluation method to construct the comprehensive evaluation index system of the multiple constraint factors of city underground space development...
Auto Insurance Course is a market oriented course, with close relation with market and industry. Case study method is a useful way to improve the ability of utilizing knowledge to solve actual problem, and enhance the career competence and ability. Based on the characteristics of the course and case study method, the method to incorporating case study in course teaching is established, thus to improve...
In order to improve the reverse circulation(RC) pumping performance and enhance the effect of RC, the suction-type RC bit on the basis of ejection theory was designed. And with theoretical calculations, computational fluid dynamics(CFD) and experiment, pressure field and velocity field produced by different angle inner nozzles were studied. It was discussed the feasibility of suction principle in...
Company's capital concludes both the physical capital of owners and the manpower capital of administrators, therefore, with this two rights separation mode, the distribution of interest's residual claims between the two sides forming a game Because using classical game theory to analyze the distribution of the optimal balance has trouble, the company's residual claims is probed into the quantization...
Because of the credit risk between both the supplier and the demander of funds in capital market, the article introduces the evolutionary game theory to behavior of the supplier and the demander in capital market, and builds the evolutionary game model of trusting behavior, and then draws a copy dynamic phase diagram. Finally this paper analyzes the influencing factors and gets the conclusion that...
In the article, a course on high performance High intensity discharge (HID) driving circuits is presented. With the driving circuits available from a prerequisite course, the present course emphasizes the design and implementation of the driving circuit as well as system integration issues. Laboratory sessions are an essential part of the course. Successive completion of the laboratories automatically...
The oxygen sensor of electronic fuel injection engine is one of important sensors in electronic control gasoline injection system. The oxygen sensor can do the role of monitoring and instruction to internal combustion in engine cylinder. This paper verify oxygen sensor in the diagnosis of the role of EFI engine failure through measuring engine-related parameters and waveforms, such as oxygen sensor...
For the complex constraints and large set of input data, we analyze the expert-chosen algorithm and its physical characteristics like data storage, exchange and operation. Based on three different data structures, we study the performance and resource consumption of the algorithm. The experimental results show that the associative arrays are more suitable for the physical characteristics of the algorithm...
In order to study the dynamic braking of electric propulsion ship, the pumping voltage principle of ship electric propulsion in braking process is analyzed. An energy feedback control strategy is put forward. Then, the corresponding pump voltage circuit is designed, the formula for calculating braking resistor is given, and the braking process is simulated and analyzed. The results indicate that the...
According to the two video cameras in system of binocular stereo vision are at the same horizontal line and the collected images have the public areas, an improved feature point matching algorithm is put forward. This algorithm extracts the public areas from the two images, makes the feature point locate in a rectangular area and reduces the searching range in the matching process; then, it completes...
This thesis discussed equal-leg framed bent calculation of shear force distribution by different pace. By the divide pace calculation, there can been calculated both the level of concentration in the top of column and arbitrary load. From the perspective of the process, it is a more easily comprehensible.
In deep submicron process, parametric yield loss due to process variations has become a critical issue, especially for sensitive analog circuits. Design centering is one of the popular techniques to find the nominal design that leads to the maximum yield. However, in critical cases, it is possible that some parts of the performance distribution are still outside the feasible region and has no way...
The English-Chinese bilingual teaching in the physics experiment course is a significant approach to foster innovational talents in the new century in China. The applicability and feasibility of bilingual teaching in the course of physics experiment and the obstacles facing in the process of implementation are discussed. Various approaches and methods to overcome these difficulties and obtain better...
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.