Applied Mechanics and Materials Vols. 182-183

Abstract: Through ANSYS/LS-DYNA simulates mini-jet fracturing coal effect, this paper verifies that high-pressure mini-jet forms ahead hole on working face coal, which increases coal exposing area and relieves pressure inside the coal bed to creative conditions for gas relieving and flowing. Additionally underground stress, the coal around hole shifts to the hole space and enlarges the hole relieving pressure and gas exhausting scope further, which removes the coal outburst potential within the control scope and provides theoretical basis for studing the equipment of high-pressure mini-jet cutting hole against outburst.

Abstract: The procedure of volume rendering techniques is introduced. The principles and methods of two kinds of different volume rendering techniques of 3D spatial data are discussed. Application of Marching Cubes (MC) algorithm in the modeling of geological objects is given. This algorithm is modified and improved in several aspects. The asymptotic decider algorithm is employed to solve the ambiguity problem and oct-tree structure is used to reduce the number of polygons generated, which will increases the efficiency of the algorithm. The improved algorithm is applied to real geological data obtained from an iron mine in China. Real data derived from an iron mine of China demonstrates the effectiveness and efficiency of the system and the algorithms.

Abstract: The advantages and disadvantages of mainstream peer-to-peer (P2P) traffic classification technology in the current application are analyzed. As existing traffic classification tools fail to meet the super flow, as well as continuous increasing of network bandwidth, a cloud-based P2P traffic classification system model is proposed, which use the distributed parallel computing architecture named MapReduce based on hadoop.

Abstract: To provide quality-of-service (QoS) differentiation and guarantee user fairness, efficient power and spectrum utilization for the downlink multiuser orthogonal frequency-division multiplexing (MU-OFDM) systems, a novel QoS guaranteed cross-layer (QGCL) scheduling scheme is proposed in this paper. The scheme formulates the scheduling into an optimization problem of overall system utility under the system constraints. Moreover, we propose a simple and efficient binary constrained particle swarm optimization (PSO) to solve the scheduling more effectively. Comparing with the classical methods, simulation results show that the proposed QGCL scheduling scheme can significantly maximize the system throughput given that the fulfillment of the QoS requirements as well as the fairness is guaranteed.

Abstract: According to the fact that the use of electricity in grain depot is nonlinear time series, the article introduces the prediction model of electricity based on Radial Basis Function Neural Network, and conducts the modeling and prediction by adopting the historical electricity consumption of a typical grain depot. As the result of simulation shows, the model obtains better forecasting results in grain depot electricity.

Abstract: Non destructive testing is very important on wind turbine blade since wind energy has been an upgrowing industry as green energy.For the linetype of blade is twisty ,it can not be described easily in Cartesian orthonormal coordinate.A special twisty coordinate system is proposed.The wave dispersion curve of blade shell is calculated by semi-analytical finite element method and dynamical simulation of wave propagation on blade is finished.Both results agree well,showing the validity of guided wave testing on wind turbine blade.

Abstract: This paper aims to give a solutions for the construction of chinese visual speech feature model based on HMM. We propose and discuss three kind representation model of the visual speech which are lip geometrical features, lip motion features and lip texture features. The model combines the advantages of the local LBP and global DCT texture information together, which shows better performance than the single feature. Equally the model combines the advantages of the local LBP and geometrical information together is better than single feature. By computing the recognition rate of the visemes from the model, the paper shows the HMM which describing the dynamic of speech, coupled with the combined feature for describing the global and local texture is the best model.

Abstract: This paper provides a theoretical solution to the problem of diminishing manufacturing sources and material shortage (DMSMS) from a military product support perspective. We build a model of fuzzy risk evaluation of strategies and Robust Inventory strategies to treat as the fitness. An example is used to illustrate the concept developed, which would be meaningful to reduce applicable obsolescence risks and thereby reducing related life cycle costs.

Abstract: According to the design complexity due to the diversification of ship motion simulator structure and control system, we put forward that combining Stewart parallel structure based on modular design with open control system based on EMC2 controller. The system utilizes PC based on the hardware structure such as motion control interface card, servo electric cylinder and software structure such as real-time operation system UBUNTU and professional control software EMC2 which can ensure the system’s being real-time. We have studied the movement law of ship in waves and obtained the ship movement sample changing with time in waves. And we do the ship motion simulation well with the motion simulator system.

Abstract: In this paper, we design and develop an extensible tool which is used to simulate and verify online scheduling algorithms based on component technology. After generating jobs sequence randomly, this tool can simulate algorithms’ execution process and find the optimal solution, then compare the results. Users can understand algorithms’ rules better and then design new algorithms with the help of this tool.