Applied Mechanics and Materials Vols. 513-517

Abstract: The stock market is a kind of complex system with all kinds of interactions. It also shows a nonlinear characteristic. In this paper, we analysed the time series from Dow Jones indexes itself and the time series from its fluctuation difference and extracted its correlation dimension and Lyapunov exponent, which shows a chaotic dynamic characteristic in it. Moreover,we also analysed the variation of chaotic characteristic indexes in long term, and found that the correlation dimension has a quasi-periodical variation and some rapid drops in some specific years.The variation of the correlation dimension can be used to reflect some internal changes in stock market.

Abstract: With the progress and development of modern society, various electronic equipments not only have been enriching our lives, but also have become an indispensable tool for people. At present, the electronic equipment is moving towards the direction of becoming more integrated, smaller and more accurate, which requires good dynamic performance and stability. This paper builds the finite element model and makes optimization and analysis for its structure through analyzing the dynamic performance of electronic components. On the basis of the analysis, this paper puts forward a new modeling method having the parametric substructure. In addition, the genetic algorithm is used to dynamically analyze and optimally combine the components on printed circuit boards. Finally through a concrete instance, this paper calculates its rationality and validity.

Abstract: According to features of detection, tracking and identification technology of weak moving targets in image process, the paper simply introduces its technical difficulties and mainly discusses the detection and tracking algorithm for the weak moving targets. In accordance with three steps including the image preprocessing, feature selection and target tracking, the paper designs images' detection and tracking recognition algorithm for the weak moving objects in strong noise background, and describes the specific execution methods and procedures, which has a certain significance to further improve image detection for the weak moving targets.

Abstract: In this paper, the developed audio circuit board testing system of some station based on DSP is used to realizing the auto acquisition and testing of the parameters of audio signal, and we use touching screen to realize man-machine interactive and real-time display testing results. The detecting process accurate and quick , so it can be widely used in the testing , checking, maintenance, fault location and so on of the stations audio circuit board.

Abstract: During basketball sport, the movement of a joint is quite complex. And if move fast, it is difficult to constrain by fix algorithm the subtle angle changes between joints. Traditional sports vision modeling method is unable to describe the moving changes of the small areas which causes the unsatisfactory measuring effect of subtle posture in motion. This paper proposes a measurement method for three-dimensional motion posture of basketball athletes. It converts the constrained optimization problem for motion parameters as a nonlinear minimization problem by optimizing human motion parameters; uses L-M motion constraints parameter to provide fast convergent regularization method, in order to seek motion and structural parameters matrix of non-rigid basketball sport and complete three-dimensional measurement for motion parameters. The simulation results show that the method can accurately measure the 3D movement parameters of the athletes.

Abstract: The lower limbs dynamics analysis model was researched, and applied it in the ports training based on computer vision. Through theoretical analysis and computer visual simulation, the detailed theoretical and simulation data was obtained for the lower limbs torque value, which was applied to sports training. Using the computer simulation technology, the human lower limbs skeletal dynamics model was established on the computer visual simulation platform. The joint torque values in different sports models were calculated for analyzing the optimum force and power mode. In the model building process, the single leg support motion model and running model were constructed, and the lower limbs dynamics analysis was implemented for the two models, calculating the joint torque values in theory and simulation. Finally, the ADAMS software was used for dynamic visual simulation in computer vision. Simulation results can show the force torque values vividly, the simulation result and theoretical result are compared and analyzed, it provides important data references and effective theoretical guidance in sports training, and it is meaningful for the optimization of physical training and improvement of training effect.

Abstract: Identifying gradual shot transition in video sequences is the difficult point in video shot detection. The paper presents a kind of new algorithm for segmenting video shot.It reduces the dimensionality of the images using the hsv color space technique to obtain the inter-frame differences, based on which to set Dynamic steps and get dynamic thresholds to segment video shot. The experiment results show the algorithm is available.

Abstract: This paper proposes a bus route scheduling management model based on Ant Colony Optimization and traditional scheduling model. It optimizes the existing bus route scheduling management model according to Ant Colony algorithm, enhances the performance of both Ant Colony algorithm and the traditional scheduling model, and improves the optimal performance of the combining algorithm. The experiment results show that, the proposed algorithm can effectively deal with the bus route scheduling management, and the optimization result obtained is obviously better than the traditional algorithms. Furthermore, it solve the problems exist in the traditional algorithms, therefore has great application value.

Abstract: The paper mainly discusses the emergency evacuation when group incident occurs. In crowded areas, group incidents will result in disorder of flow information, nonlinear and catastrophe of flow density and motion direction. The traditional evacuation route guidance only selects evacuation route for orderly, smooth flow density variations, in which nonlinearity and mutation of the flow information cannot be reflected. Therefore, once the Group incidents occurred, the stability of the model will be destroyed. To solve the problem, the paper proposes an emergency evacuation method based on path collision probability estimation model. Simulation results show that this algorithm can improve the speed of evacuation.

Abstract: Wetlands play a number of roles in the environment, which are also considered the most biologically diverse of all ecosystems. Utilizing RS and the GIS software, remote datum were matched and classified. By these transactions, the temporal and spatial changes of wetland landscape are explored in Wuhu, combining qualitative analysis and quantitative methods. This paper analyzed the time-spatial revolution process which indicated that, firstly the area of wetland reduced rapidly from remote sensing image in 1988, 2001 and 2005, secondly the exterior of urban changed acutely and the interior were protected well in view of spatial pattern. Moreover, driving force factors were pointed out. Human activities, especially urbanization were the main causes of wetlands degradation. Simultaneity, the development of farming, the construction of infrastructure and nature were important factors. Owing to rapid economic development and urban sprawling, wetlands are encountering threaten to be converting to other land uses. Thus, the paper provides policy advices for wetland conservation and urban planning toward sustainable development.