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.
Based on the present analytical method of Econometrics, this article conducts an empirical research on the co-movement of stock price of gold mine enterprises and the international gold price. By analyzing the daily datum from January 2th 2004 to October 20th 2009, the article concludes that there is a relative high correlation between the stock price of gold mine enterprises and the international...
The electronic information display console is an important device displaying integrated information on some type of large-scale ship. The human-computer interface (HCI) design that is not good enough will cause inefficiency or injury to the operators. If the deficiency is discovered while working, it will cost much labor, money and time. The virtual simulation method is tried to use evaluating the...
A two-stage data envelopment analysis (DEA) model is created to provide valuable managerial insights when assessing the dual impacts of operating and governmental strategies for the Science and Technology Activity Efficiency. This new model is used to analyze the inputs and outputs for the science and technology activity in the region and how to achieve efficiency systematically. In this paper, it...
Based on the motor machinery characteristic curve, establishes the dynamic model of the two-joint-motor machinery series system, completes the digital simulation no-load state to start driven by single-motor and two-joint-motor, analyses the elastic axis to adjust the size of the system stiffness and dual-motor mechanical properties differences to the system dynamic characteristics, compares the angular...
In view of the shortage of numerical control(NC) teaching resources and some problems such as high cost and high risk of equipment in current NC training area, with the rapid development of virtual reality, computer network and human-computer interaction technology, a feasible programme of virtual NC simulation system based on browser/server(B/S) was brought forward. Firstly, the development platforms...
This paper focused on modeling and performance analysis of linear inverted pendulum and design and simulation of LQR controller. Main to introduce how to built the mathematic model and the analysis of it's system performance, then design a LQR controller in order to get the much better control. Simulation is done to show the efficiency and feasibility of proposed approach.
In order to achieve the sustainable development in multi-span plastic covered greenhouse with high production efficiency, it was this research that established the mathematical model of the environment for cucumber production in coupling with the biological model of it, by making use of the knowledge of heat transfer, thermodynamics and the principle of energy balance as the research platform. The...
For current practices on the measurement-based load modeling, the dispersity of the identification results is an obstacle in the application of the load model. Based on the improvement of the basic genetic algorithm and the sensitivity analysis of composite load model parameters, this paper proposed a new identification strategy, in which the majority of parameters are fixed and only the parameters...
Design philosophy of dual-clutch automatic transmission (DCT) shift law was defined; utilizing theoretical calculation of vehicle fuel-consuming model and vehicle dynamic model and the weighting method, combining parameter of the vehicle and engine drive model shift law of dual-clutch automatic transmission was defined. Under CAT-7300-D-P environmental chamber, using RPL1229/12C dynamometer machine...
An evaluation model of Gray Relational Analysis with preferences of decision makers based on Characteristics-AHP is built. This model makes fully use of the advantage of gray theory on the fields of performance evaluation for small sample and poor data. Considering preference degree of decision-makers not only makes evaluation result objective and fairness, but also reflects decision-making fact....
The mapping design of network on chip (NoC) is one of the cores of SoC design for digital signal process system (DSPS). A NoC mapping method based on data flow graph (DFG) is addressed in this paper. For modules of heterogeneous processors, central memory, and IPs (intellectual properties), DFG model analysis shows that DFG model provides important data transmission properties included the direction...
This paper describes the workflow management system and its functional characteristics, gives the formal definition of workflow model. Combined with the present situation of college Party's admission, it discusses the business process of Party's admission, builds a Petri net-based workflow model. Based on Web applications as background, it presents solutions for college Party's admission management...
We evaluated the projects risk by using the Back Propagation neural network model, then set up the risk evaluation indexes of enterprise credit guarantee projects. The training samples, verification samples and testing samples that the model needed were generated by the randomly get arms method in the range of single-index evaluation standard. The case study indicates that the methodology for generating...
For indicators of relief valve's dynamic characteristics, most important things are both stability and rapid response ability. However, up to the present there is no effective design parameter to satisfy its demand. So, a pilot-operated relief valve and its dynamic experiment system's simulation model were established, by means of AMEsim software technology. Through the batch parameters simulating...
System reconfiguration design is to find the design schemes that meet the real requirements. The reconfiguration design process is the process that the problems are solved. The extension model of the automatic visual inspection (AVI) system based on matter-element analysis theory is provided, and the transformation process for image preprocessing schemes is described by extension transformation methods...
With studying hardware-in-the-loop simulation system of infrared controlling and guiding, system identification is adopted to analysis the error of simulation equipments. An appropriate identification method is studied to equipment modeling. An identification experiment is designed, including the selected signal which is used for identification, and data pretreatment. With the result identified, Differences...
Duncan E-B model has been widely used in engineering practice. And how to determine the parameters of the model accurately and easily is the main step to ensure the reliability of the results. Based on BP neural network in MATLAB toolbox, this paper aim to establish the non-linear relation between the density γ, porosity e and the constitutive model parameter K (Kb, Rf, Q0) which is difficult to be...
On the basis of reasonably simplifying the structure of disc cutter, the rolling force is used as the vibration source and based on equivalent stiffness method, the method to establish a general vibration differential equation of rolling rock in the rolling direction is further discussed. Through theoretical derivation, a conclusion can be drawn that the range of the vibration frequency is ωf-1.414ω...
The loader drive bridge is the main bearing components of the loader and is also the axle housing of transmission system. This paper detailed deduces the force status for the drive axle housing in four kinds of typical operating conditions. Then, the finite element analysis was executed for the axle housing structure. The force state of weld part of axle tube was focused in analysis where it is easy...
The dynamic performance of a fully pre-stressed six-component force sensor is simulated based on the software of ADAMS. The dynamics theoretical model of the sensor is built first, and the natural frequency and mode vector are deduced. Two simulation methods based on rigid-flexible model and spring-limb model are proposed. The natural frequency and mode shapes of the sensor are obtained by dynamic...
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.