Key Engineering Materials Vols. 439-440

Abstract: Based on the remove-restore technique, the application of the Tikhonov regularization algorithm to reduce the effect of measurement error in the airborne gravity dada in researched. By the experiments of two kinds airborne gravity data, which having constant system error and casual system error, the compare of different downward continuation algorithm is performed. According to the results of simulations, the Tikhonov regularization algorithm can effectively reduce the effect of height and the measurement error in the airborne gravity data downward continuation compared to other algorithm.

Abstract: In this paper, we analyze the stock of Tsingtao Brewery Co Ltd for the 8-year period, from July 31, 2001, to September 11, 2009, a total of 2003 trading days. Using the False Nearest Neighbors method, we obtain the embedding dimension m in the k-nearest neighbour Algorithm. In order to investigate the validity of this method, we apply the modified method to the daily adjusted opening values of the Tsingtao Brewery Co Ltd. We find that the prediction of experimental results is more accurate than traditional methods.

Abstract: In this paper, we analyze the stock of Nanjing Panda Electronics Co Ltd for the 44-year period, from May 2, 1996, to October 9, 2009, a total of 3200 trading days. Using the Box-counting dimension method, we find that the financial data have different power law exponents in the plot for the number of box and diameter of box, which indicates the multifractality exist in the time series. In order to investigate the latent properties in the data, the width and maximum of the singular spectrum are calculated. The results show the strong degree of multifractality in the time series.

Abstract: This article analyzes the customer acquisition and retaining policy and then build a customer acquisition and retaining model according to the practical market investigation. This model provides some managerial insights about the customer decision for the firm which can be directly implemented in the management practice.

Abstract: For acoustic radiation of open thin-walled structure, it was difficult to analyze directly by analytical method. The problem could be solved by several numerical methods. This paper had studied the basic theory of the numerical methods as FEM (Finite Element Method), BEM (Boundary Element Method) and IFEM (Infinite Element Method), and the numerical methods to solve open structure radiation problem. Under the premise of structure-acoustic coupling, this paper analyzed the theory and flow of the methods on acoustic radiation of open structure, including IBEM (Indirect Boundary Element Method), DBEM (Direct Boundary Element Method) coupling method of interior field and exterior field, FEM and BEM coupling method, FEM and IFEM coupling method. This paper took the open structure as practical example, and applied the several methods to analyze it, and analyzed and compared the several results to get relevant conclusions.

Abstract: The method of measuring infrasound wave in the process of low carbon steel damage is presented. The test program is designed, which applies infrasound wave microphone and data acquisition, and the infrasound signal is collected and analyzed. The result of test and spectrum analysis confirmed that in the stages of low carbon steel damage course, including elastic stage, yield stage and strengthen stage, about 2Hz infrasound wave signal is radiated.

Abstract: The scale models are usually tested to study the dynamic characteristics of large structures or micro-electromechanical systems. Dimensional analysis, as a classical similitude analysis method, because of the uncertainty of the basic vector of solutions, is a trial-and-error approach greatly depended on experience. Based on the finite element method (FEM) and frequency response function (FRF) analysis, a new method was proposed to quantitatively analyze the similitude of the model parameters and the FRF between the full size model and its scale model. And the load scale rules were established to predict the static or dynamic response characteristics of the actual structure.

Abstract: The linear programming based method are popular methods for learning from empirical data (observations, samples, examples, records). In this paper, an interval linear programming based method for regression problems is proposed. The explicit representation of the general optimal solution of regression problem is obtained in terms of a generalized inverse of the constraint matrix. This explicit solution has obvious theoretical (and possibly computational) advantages over the well-known iterative methods of linear programming.

Abstract: The paper investigates the cross correlation mitigation (CCM) technique in the multipath propagating environment. It analyses the impact of cross correlation firstly, then expounds the universal technique in CCM, at last presents an improved DPIC (Delayed Parallel Interference Cancellation) method based on MEDLL. The algorithm estimates the parameters of multipath by using MEDLL, reconstructs the strong signals IF utilizing these parameters, and mitigates the cross correlation with the aid of DPIC method. At last, simulation results prove the validity of this method.

Abstract: The paper presents a novel algorithm for multiple space vehicles positioning. The algorithm first positions the ground stations using multiple space vehicles with initial coordinates, then calculates the differences of the ground stations position results and their real coordinates, at last uses the differences to estimate the revised error for space vehicles’ coordinates. It can use iterative method to achieve needed precision of the SV’s coordinates. At last, simulation results prove the stability and credibility of the algorithm in space vehicles positioning.