Applied Mechanics and Materials Vols. 380-384

Abstract: Using the WRF model and NCEP data, a typical winter sea-land breeze progress in China tropical island was simulated, analyzing the impact of wind field simulation with the horizontal resolution, analog range, nesting level, and analog time. The results showed: the simulate effects of the WRF model could not always keep step with the increase of horizontal resolution. Obviously there was a threshold for the model horizontal resolution. By the same token, analog range, nesting level, and analog time have its threshold. The accuracy of the simulation reduced when the threshold values were exceeded.

Abstract: In this paper, we mainly focus on the structural optimal design of dynamics for continuum structures, and aim at constructing the topological optimal formulation by using the ICM (Independent, Continuum and Mapping) method, which is considering weight as objective function and fundamental eigenfrequency as constraint. The local model is removed by selecting suitable filter function. And two algorithms, dual sequential quadratic programming (DSQP) and global convergent method of moving asymptotes (GCMMA) algorithm, were used to solve the mathematic optimal model. Finally, numerical example is provided to demonstrate the validity and effectiveness of the ICM method and compare the optimization results of two optimization algorithms. The results show that both optimization algorithms can solve the mathematics optimization model effectively.

Abstract: nanoCT with synchrotron radiation has a high spatial resolution up to nanoscale which provides an approach to the 3D inter-structure of sample of tiny size in the research of biology, materials and so on. However, due to the high resolution it provide, the field of view is limited to only about 15~60μm. In order to improve the scale of field of view, we discussed a new scan mode called half-scan which is using the symmetry of parallel-beam x-ray and newly applied in the synchrotron radiation imaging field. In this paper, we deduced the data processing method which is consisted of data preprocessing and filter back projection (FBP) algorithm. Numerical simulation and analysis demonstrate that the field of view can be enlarged up to 100% with this method.

Abstract: CORDIC Algorithm is widely applicable to the hardware implementation of DSP, and it attaches a great importance in many hardware implementations of DSP for a lot of arithmetic operations are simplified to simple addition operations and shifting operations. The FPGA implement of sine and cosine functions are achieved through CORDIC Algorithm in the paper, and the input and output data of the entire structure complies with IEEE754 standards. The basic theory of CORDIC Algorithm is introduced first in the paper, then the hardware iterative formula and the flow chart get out of basic formulas are given, and the structure of the design is introduced in detail, at last synthesis and simulation results are given.

Abstract: In this paper, a low-power and high-modularity architecture for 8-point discrete cosine transform (DCT) computation is proposed. The coordinate rotation digital computer (CORDIC) based fast algorithm for DCT computation is derived using matrix decomposition. The sum-angle formula and double-angle formula is used to reduce the CORDIC types. Thus, a high-modularity DCT architecture is obtained by reusing the unique rotation angle CORDIC. The experimental results show that the proposed DCT architecture has lower power and higher modularity than other known architectures.

Abstract: in order to avoid signal collision when two or more tags send recognizable signals to the reader of underground coal mine personnel tracking system , the binary tree search algorithm along with algorithms which improved from them is discussed, an adaptive anti-collision algorithm is proposed .In the respects of time and space the algorithm shows obvious advantages than the binary tree search algorithm ,so the probability of collision reduces greatly and the problem of collision maybe effectively solved.

Abstract: This paper presents an improve Meanshift tracking algorithm based on Kalman filter and Rotation-Invariant Features. Firstly, this paper forecasts the original alternate position using Kalman filter. Secondly, a kind of spatial histogram based on GRA (Gradient Radius Angle, GRA) is introduced, which is a rotation-invariant descriptor combined the information of gradient. At last, this paper searches the scale factor by the normal scale space decomposition technique. Experiments show that the method concerned in this paper has better performances than two improved algorithms.

Abstract: As the slurry continuous wave changes according to the measurement of drilling (MWD) date, the precision of error rate prediction is low and the process of transferring data will be affected by signals. Based on the BP neural networks extensive mapping ability and chaos optimization algorithms global convergent ability, we structure a kind of improved chaos optimization of BP neural network algorithm. This algorithm can avoid several problems, such as the convergent speed of BP neural network is slow and the BP neural network is easy to sink into local minimum. With the powerful ability of generalization and prediction, this kind of algorithm can also be used to predict the data transmission error rate in slurry continuous wave. Under the condition of small samples, we create a model of data transmission in slurry continuous wave, which is based on improved chaos optimization of BP neural network. Simulate experiment has tested this algorithms feasibility and effectiveness

Abstract: Currently Gobang online game is not perfect, the most important problem is the man-machine play and online play can not be implemented together. In order to solve the problem, a Gobang online game was developed which could be not only a man-machine game, but also an online game. The message mechanism was designed to manage messages from network. And the overall system architecture and the main algorithms were described accordingly.

Abstract: Because of the frequent occurrence of injury accident in the sports curriculum, the security of physical education cannot be ignored. So, this paper analyzes the factors of injury accident in physical education teaching process and proposes prevention measures. The establishment of security system in physical education is an urgent problem. This paper studies the causes and countermeasures of sports injury accidents based on two methods: causality diagram and analytic hierarchy process. The first section introduces the principles of causality diagram and hierarchical analysis in detail. The second part of the article establishes mathematical model of the analysis method. The part three of the text investigates and analyzes the accident status and prevention measures of 100 primary schools and universities in Heilongjiang province in the form of literature researches and questionnaires. It also proposes weight coefficients and causality diagrams of Sports Injury Accidents using causal analysis theory. It converts causal diagram into a hierarchical model using the analytic hierarchy process AHP.