Computation of the Wavelet and Scaling Functions Using Coefficients of Wavelet Filter

To associate the discrete wavelet transform with the continuous wavelet transform, an iterative convolution algorithm is given by analyzing the and scaling function using coefficients of wavelet filter. usually used methods of the computation The way of judging the convergence of improved algorithm on of the wavelet function iterative convolution is given. The advantages of improved algorithm is analyzed. The experimental result shows that the modified algorithm is effective.     

Modal Shape Analysis Methods of Machine Structure

The iterative Lanczos-reduce method for sensitivity analysis, the Guyan condensed method and the iterative synchronous vector methods in finite element modal are studied in order to solve the dynamic characteristic of complicated machine system. The primary reasons influenced on calculation precision are pointed out. The principia of master freedom for Guyan condensed method are put forward. The calculation precision of three methods is compared with the same standard finite element model. The iterative Lanczos-reduce method for sensitivity analysis is proved to be optimum analysis and the eigenvalue of arm in work device of hydraulic excavator in finite element model is solved with iterative Lanczos-reduce method for sensitivity analysis. The theory basis is provided for reasonable choose to solve the dynamic of complicated machine structure.     

The Control Strategy for the Excitation System of Asynchronized Turbogenerators

In this paper, the excitation principle and operating characteristics ofasynchronized turbogenerators are analyzed,and adaptive tracing iterative control strategy based on state identification is proposed. In order to apply this control scheme to practice engineering, some primary elements are analyzed and presented for constituting dual-channel automatic excitation control system of asynchronized turbogenerators. Finally, the paper presents the principle structure charts about excitation control system of asynchroized turbogenerators.     

New Iterative Method of Ventilation System'' s Wind Quantity for Electric Machines

Solving methods of wind quantity in complex ventilation meshes which includ wind pressure source are researched. A general matrix model of ventilation meshes and new iterative formulas are proposed. Two computing examples are given and the results shows that each branch' s wind quantity can converge the stable value by several times of iteration for any iterative initial value. The proposed model is suitable for wind quantity computation with complex ventilation structure of electric machines.     

Adaptive Iterative Learning Control of Nonlinear Systems with Unknown Control Direction

An adaptive iterative learning control scheme is proposed for a class of mismatched nonlinear systems with periodic uncertainties and unknown control directions. The control algorithm has the following three features;the control method does not need control direction information; the periodic uncertainties are learned online by a learning control method; and the algorithm can deal with mismatched uncertainties. The proposed method can achieve asymptotical convergence along a learning repetition horizon. A simulation example is provided can demonstrate the effectiveness and feasibility of the control strategy.     

Research on the improvement of the convergencespeed for CDMA system power control

Optimal power control with game-theory has been a hot research topic in code division multiple access (CDMA) system. However, the convergence speed of the power control algorithm based on traditional static game-theory is not fast enough and the power fluctuation is large during the iterative process. In order to solve this problem, dynamic game-theory is introduced into CDMA system power control algorithm. The simulation results show that the proposed algorithm, compared with the distributed power control algorithm based on the traditional static game theory, can improve the convergence speed obviously with the same power spending.     

Multi-Step Iterative MUD Technology for TD-SCDMA System

Joint Detection technology is a hot point in the research of TD-SCDMA system. Because of a SNR degradation, JD can not reach the need of system performance when system loads is close to the spread factor. MSJD and iterative multi-user detection are put forth to overcome the problem. When iterative MUD is adopted, the research shows that system performance is close to single user performance after 3 iterations, but its computational complexity grows exponentially with the number of code channel. When MSJD is adopted, complexity is reduced compared with iterative MUD, but system performance of code channels numbered K is only close to system performance of code channels numbered K/2 as JD is used. Considering computational complexity and system performance, multi-step iterative multi-user detection technology is brought forth based on iterative MUD and MSJD. According to simulation, the result can be concluded that complexity is reduced compared with single iterative MUD and system performance is improved compared with single MSJD.     

Average Temperature Distribution of the Ceiling Jet in Train Fires in Tunnels

The flame ceiling jet is easily formed while the on fire train stops in the tunnel. The iterative formula is derived to calculate the average temperature of the flame ceiling jet when the fire source is set on the center of the train by establishing a one dimensional model of the unit control volume, and the heat exchange is considered among the flame smoke and the wall of the tunnel and the train. Undetermined coefficients in the iterative formula are determined by small scale model experiments with the scale factor of 1:8 and numerical simulation. The calculated values of temperature by the iterative formula are consistent well with the measured values, and the maximum error of calculation is no more than 7%, which indicates that the iterative formula is reliable. The results show that the distributions of the average temperature of flame ceiling jet are in the exponential form, but there are some differences between that above the train and that in the tunnel. Two prediction formulas for the flame ceiling jet average temperature changing along the longitudinal tunnel are obtained by the sub fitting method. The results can provide reference for the alarm parameter selection, device settings in tunnel, safety evacuation of the passenger, as well as the analysis of the destructive effects on the tunnel lining structure caused by tunnel fire.     

On the Iteration of Fixed Points for Generalized Quasi-contractive Mapping in p-convex Metric Spaces

The purpose of this paper is to define an Ishikawa iterative scheme for generalized quasi-contractive mappings in p-convex metric spaces and to prove that this iterative scheme converges to the unique fixed point of generalized quasicontractive mappings in p-convex metric space. The results presented in the paper generalize and unify the corresponding results in given by Liu Qin-hou, Xu Hong-kun, Ding Xie-ping, H. E. Rhoades, et al.     

The Differential Scheme of Pricing for American Put Options

Based on the differential scheme,presents a numerical method of pricing for American put options.Firstly,the partial differential equation satisfied by the option price is transformed into a series of differential equations.Then,these differential equations are solved by the iterative method.The numerical method includes the implicit finite difference method and the explicit finite difference method and these two methods are compared.Finally,a numerical example is given and the validity of the algorithm is checked by a series of experiments.Some useful results are obtained for its application in the option markets.     

Solving the Symmetric Positive Definitesystems of Linear Equations Which Have Positive Semi-definite Tri-diagonal Matrix Increments

This paper deals with a kind of iterations,which need to solve the symmetric positive definite systems of linear equations whose matrices of coefficients have varying positive semi-definite tri-diagonal martrix increments. The positive semi-definite tri-diagonal martrix increment is especially divided, an iterative algorithm is presented. It to use the algorithm in the iterative process of repeatedly solving above mentioned system. Wu Zhuzhu has presented an algorithm for diagonal elements with positive increments. The algorithm of this paper which takes martrix increments into account, is the generalization of the algorithm presented by Wu Zhuzhu.     

Iterative Approximation with Errors for Solutions to Variational Inclusions With Strongly Accretive Type Mapping

We established the generic principle in Banach spaces about unique existence of solutions and approximation of Ishikawa iterative procedures with errors for a class of variational inclusions with strongly accretive type mappings. It is also pointed out that this problem, widely researched approximation of Ishikawa iterative procedures for variational inclusions with strongly accretive type mappings, is only an especied example of Ishikawa iterative procedures with errors. The results are the popularization and deuelopment of the recent corresponding results.     

Improvement and Application on Back Propagation Network Based on Partial Least-squares Algorithm

This paper proposes a novel BP network model based on nonlinear iterative partial least-squares algorithm which can fit nonlinear data. The novel BP network model can reduce iterative step number and advance learning effieieney. This paper pretreats data by nonlinear iterative partial least-squares algorithms. The weights initialization of input floor and output floor are set by applying the loading weights of dependent variable and cause variable, the member of hidden nodes are set by applying factor numbers of nonlinear iterative partial leastsquares algorithm, the connection co- efficient is set by applying the connection matrix B. Performances of the BP, PLS, and PLS-BP are analyzed and compared. The results show that the PLS-BP has better fitting and forecasting than BP and PLS.     

A General Method for the Initial Values for Two-Sided Iteration

In the study on finding a group of inital values for solving operator equation x=G(x)by the two-sided iterative method,some stronger conditions forG(x)have been demandedand some new parameters have to be introduced since 1978,But,as it will be proved in this paper,Itis unnecessary to use any new parameters and other stronger conditions to get a group of initial val-ues of two-sided iterative, as those initial values can be obtained by means of an auxiliary iterativebeginning with operator G(x)itself. The numerical example in this paper illustraves that the methodproposed in this paper is a general method.     

The Simulating and Actual Measuring Calculation of the Inverse Problem of Circular Low Frequency Electric Current Field

The inverse problem of circular low frequence electric current field is calculated using simulated and actually measured data by modified iterative equipotential line algorithm.     

Convergence of Ishikawa Type Iterative Sequence With Errors for Asymptotically Quasi-nonexpansive Mappings in Convex Metric Spases

Liu Qihou, in 2001 and in 2002, extended the results of Petryshgh and Williamson, Ghosh and Debnath respectively in 1973 and in 1977, proved some sufficient and necessary condition for Ishikawa iterative sequence and for Ishikawa iterative sequence with error member of asymptotically quasi-nonenpansive mappings to converge to fixed poind in Banach space and in uniform convex Banach space. In convex metric spaces,the Ishikawa iteration process with errors is defined for asymptotically quasi-nonexpansive mappings.Some sufficient and nevessary conditions proved for the iterative schene converges to the fixed point of the asymptotically quasi-nonexpansire mappings.These results qeneralize and unify many important known results in recent literature.     

白蜡窄吉丁综合防控研究进展

白蜡窄吉丁是一种入侵性害虫,寄生树种多、隐蔽性强、危害大。详细叙述白蜡窄吉丁的形态特征、地理分布及其综合防控方法。其中,防控方法主要包括生态控制、物理防治、生物防治及化学防治等方面。提出生态控制和生物防治,特别是对其天敌寄生蜂的分布与控制作用评价、优势天敌的空间分布、繁殖与释放利用是今后研究的重点。     

中国东北地区亚洲飞蝗绿色防控研究进展

为了有效地治理亚洲飞蝗灾害,必须改变防治策略,加大生态控制和生物防治比重,科学运用各种方法,逐步实现对亚洲飞蝗的可持续治理。亚洲飞蝗的生物学特性复杂,目前对这种突发、迁移性害虫在中国东北地区的栖息环境和发生规律尚不明确。笔者详细介绍了亚洲飞蝗的生活习性及其防治方法。防治方法主要包括生态控制、生物防治、化学防治等方面。对于亚洲飞蝗的防控,应以预防为主,综合考虑治蝗策略。     

analysis and application of demand forecasting model with multi element variable parameters

A forecasting model for logistics demand was presented to overcome the limitations of single goal forecasts of logistics demand and forecast data complexity. Based on the forecasting evaluation index and pretreatment of rough set theory, a multi input and multi output wavelet network (MMWNN) model for forecasting multi element regional logistics demand was studied. The network configuration was confirmed using the stepwise checkout and iterative gradient descent methods. After rough set reduction, the evaluation index was used to forecast the multi element regional logistics demand. The results of the numerical example indicate the feasibility and effectiveness of the model.     

OPTION AND OPTIMUM OF PARAMETERS RICHARDSON TWO-STAGE ITERATIVE METHOD

This paper discusses that the conditions are satistiel by parameters in the Richardson two-stage iterative method when it converges and the optimum of parameters makes this iterative converge more