Advanced Materials Research Vols. 631-632

Abstract: In this paper, we proposed a set of data acquisition signal generator based on LabVIEW development tools, and realized the data communication from data collection terminal to testing the PC that based on serial port. Completed the function which of including data acquisition, signal generating and verified by simulation. The different between traditional generator and the Labview designed generator is to banish tedious and bulkiness of the traditional generator. With its unrivaled hardware integration and other unparalleled features, LabVIEW is an industry-leading software platform.

Abstract: In this paper, we propose a new computational inverse method for solving the identification of multi-source dynamic loads acting on a simply supported plate. Using a priori choosing appropriate regularization parameter, the present method can obtain higher optimum asymptotic order of the regularized solution than ordinary Tikhonov regularization method. In the numerical simulations, the identification problem of multi-source dynamic loads on a surface of simply supported plate is successfully solved by the present method. Meanwhile, most of its performances are better than ordinary Tikhonov regularization method.

Abstract: A novel human action recognition algorithm based on key posture is proposed in this paper. In the method, the mesh features of each image in human action sequences are firstly calculated; then the key postures of the human mesh features are generated through k-medoids clustering algorithm; and the motion sequences are thus represented as vectors of key postures. The component of the vector is the occurrence number of the corresponding posture included in the action. For human action recognition, the observed action is firstly changed into key posture vector; then the correlevant coefficients to the training samples are calculated and the action which best matches the observed sequence is chosen as the final category. The experiments on Weizmann dataset demonstrate that our method is effective for human action recognition. The average recognition accuracy can exceed 90%.

Abstract: With the improvement of mobile communication network communication equipment intelligent level and the growth of the business needs, network management is also increasing the accuracy and timeliness requirements. And due to the lack of multi-disciplinary network of integrated network management system, it is difficult to conduct unified management of network resources, maintenance, scheduling and optimization. The based on TMN basic theory, analysis of network management information model, the design of management information model system (MIF) in the 3G mobile network management application framework, the level of clarity of the framework to facilitate the use of standardized information model abstraction, has a good reusable and scalability characteristics; unified NMS network element management, and thus laid the foundation to provide integrated access reference for the design and development of next-generation mobile network management system based on the framework enables.

Abstract: A zero-watermarking algorithm for text image that based on DWT and the signal energy was proposed. We first change the text file into the corresponding binary image, then apply triple-wavelet transform on the binary image, and combine relations of the signal energy to construct zero-watermark. At the watermark detection step we use the similarity to judge the copyright Information. The attack experiments shown that the proposed algorithm were robust to a variety of attacks, and had a good Invisibility. The watermark algorithm obtained a better solution to the embedding capacity and the Invisibility, for the zero-watermark algorithm does not need to modify the carrier data. So it can meet the requirements of practical application.

Abstract: The radiated sound field of rotating machinery or reciprocating machinery has a significant periodically time-variant nature. This is a kind of non-stationary sound field and called cyclostationary sound field. In the conventional planar near-field acoustic holography(PNAH), this kind of sound field is treated as stationary field, so the information relating to the change of frequency with time will be loss inevitably. In this article, the cyclic spectral density(CSD) instead of the complex sound pressure was adopted as reconstructing physical quantity in the PNAH, and the cyclostationary PNAH(CPNAH) technique was proposed. Meanwhile, focusing on the calculation complex of CSD and the accuracy of the cyclic nature extracted, the gathering slice method of CSD was proposed by referring time aliasing methods on time series. The experiment results illustrate that the cyclic nature of cyclostationary sound field may be extracted directly and the location of the source determined exactly as well.

Abstract: To improve the performance of standard particle swarm optimization algorithm that is easily trapped in local optimum, based on analyzing and comparing with all kinds of algorithm parameter settings strategy, this paper proposed a novel particle swarm optimization algorithm which the inertia weight (ω) and acceleration coefficients (c1 and c2) are generated as random numbers within a certain range in each iteration process. The experimental results show that the new method is valid with a high precision and a fast convergence rate.

Abstract: Experiment is an important part in the teaching process of electronic technology course, and EDA virtual experiment provides an interactive, active participatory and responsive learning environment for the students by creating a virtual environment. This learning environment can help students to grasp the theoretic knowledge from classroom learning faster and better, deepen the understanding of basic concepts and principles and be familiar with the use of commonly used electronic instruments, which would promote the cultivation of students' quality. Moreover, in the environment of 3D display, students can observe three-dimensional objects from different perspectives and won't be confused with the excessive crosses of conductor design, so as to strengthen their feelings on the actual electronic devices.

Abstract: In order to meet the needs of enterprises for chamfering complex parts, based on the customization of commercial CAD/CAM software, chamfer programming software is developed. According to user’s machining demands for a part, a chain of edges of a part is extracted from its 3D model. With preprocessing of the chain of edges, the continuity of the chain is estimated, and the start and end point of those edges are automatic obtained. Furthermore, with human-machine dialogue, machining parameters is set by users. By definition of the primary and secondary surfaces of the chain of edges, and interpolation of the edges, the positions of cutter location point and postures of cutter are calculated. Finally the interference of tool path is checked, and tool path is simulated. The software solves the programming problem of chamfering complex parts.

Abstract: For the high order, unstable, multivariable, nonlinear and strong coupling characteristics, robust stability is an important indicator of inverted pendulum system. In this paper an LQR robust controller of inverter pendulum system is designed. The simulation and the experimental results showed that the stability of the robust LQR controller is better than the original LQR controller. When the system departure counterpoise for all kinds of reasons, it get back equilibrium state without depleting any energy, and approach state of equilibrium of all state component.