Applied Mechanics and Materials Vols. 496-500

Abstract: With the extensive application of XML, especially in e-commerce field, XML data security has become the focus of people, which particularly shows in its structural attack specific to the location relation to elements in tree structure. Combined with the characteristics of tree structure of XML data as well as the basic features of traversing binary tree, the paper proposes a method to protect the structural-integrity of XML digital signature, so as to protect XML data element from structural attack through the basic features of traversing binary tree, and ensure the absolute location relationship among elements.

Abstract: With widely applications of Multi-Agent System in internet and intranet, how to ensure security related to multi-agent is a big issue. This paper mainly focuses on communication security of MASs. Through investigation, there are five typical security models relating to MASs, and all these models communicate using XML data format. With traditional cryptographic technology, these models provide a coarse granularity security. The paper proposes XML Security Specifications which based on XML should be deployed within MASs communication.

Abstract: To detect the horizon for the UAV attitude measurement based on the visual navigation, a horizon detection algorithm based on the dark channel prior in foggy weather is proposed. This algorithm firstly uses the principle of dark channel prior for the haze removal to get the dark channel image, then uses horizontal and vertical Sobel operator to carry on edge detection on the dark channel image, getting the binary image. Finally, detect the horizon through the method of rotating image. Experiment result shows that, this algorithm can effectively detect the horizon and is robust to some complex scenes.

Abstract: The research of the communication between USB interface chip PDIUSBD12 and the data sampling system which is based on FPGA is introduced. And it gives a design method of a data acquisition system based on USB interface and FPGA technology. Both the logic relation and communication between USB and FPGA are studied. And it also provides the design method of the driving and application program. Finally, the simulation result proved that the method can not only achieve great agility and high speed, but also make the data communication interface rapidity and simplicity. Key words: USB; FPGA; data sampling; driving program; application program

Abstract: In this paper, through the analysis of the characteristics of particle swarm optimization algorithm, combined with the specific circumstances of Bayesian network structure learning, proposed to based on improved particle swarm algorithm.The algorithm uses the BIC measure function as a standard Bayesian network, while preserving the optimal particle case, the possibility of a mutation operation is added to decrease the algorithm into a local optimum. Through a typical Asia network, show that the algorithm is feasible, and other related algorithm is better than the experiment, the effectiveness of the algorithm. In this paper, the algorithm is verified from two aspects of theory and experiments, the results show that the algorithm is feasible.

Abstract: Research status and development of the recommendation system are studied, the focus of evaluation of recommender system and recommender system based on social network in two aspects, and puts forward some improved algorithm, and achieved certain results. KDD Cup 2012 Track data for the simulation experiments on the correlation algorithm based on search engine, has been shown in different positions on the relative attractiveness of advertising, numerical user. At the same time, rapid calculation of the degree of correlation between a user and other users of an algorithm is given, and then quickly given the recommendation results. KDD Cup 2012 Track data for the simulation experiment of the algorithm, and the analysis result is given.

Abstract: Human vision is generally regarded as a complicated process from feeling to consciousness. In other words, it refers to a projection form 3-D object to 2-D image, as well as a cognition of real objects according to 2-D image,The process that a real object is modeled through some images is called 3-D reconstruction. Presently, camera calibration attracts many researchers, and it includes the internal parameters and the external parameters, such as coordinate of main point, parameters of rotation and translation. Some researchers have pointed out that parallelepiped has a strict topological structure and geometric constraints. Therefore, it is suitable for the self-calibration of camera. This paper briefly explains parallelepiped methods and tries to apply this method to deal with self-calibration. The experiments show that this method is flexible and available. image.

Abstract: To improve the performance of automatic target recognition technology and solve the problems of traditional methods, such as high false alarm rate and poor adaptability to environment changes, a new algorithm based on support vector machine is proposed. We have realized the feature extraction of the target and the parameter optimization of the support vector machine to get the support vector machine model applied to the target recognition of unknown images. Experiment results show that the algorithm has a good recognition effect, a fast recognition speed and certain anti-interference abilities based on sufficient samples training.

Abstract: In order to resolve the inefficiency for XML data query and support dynamic updates, etc, this paper has proposed an improved method to encode XML document nodes. On the basic of region encoding and the prefix encoding, it introduces a XML document coding schema base on binary (CSBB). The CSBB code use binary encoding strategy and make the bit string inserted in order. The bit string inserted algorithm can generate ordered bit string to reserve space for the inserted new nodes, and not influence on the others. Experiments shows the CSBB code can effectively avoid re-encoding of nodes, and supports the nodes Dynamic Update.

Abstract: For virtual instrument technologys character of high performance, easy to implement hardware and software integration, etc., virtual instrument technology and Labview are applied to test fields. Using computer and NI PCI-6221 data acquisition card as the hardware and LabVIEW8.5 software as a development platform, a data acquisition and signal processing virtual test system is built. The system is consisted of signal source and the signal processing module, in which the signal source is he FMCW radar level differential frequency signal connected by data acquisition card; signal processing section includes a time-domain measurement signal source, waveform display, filtering, spectral analysis, etc. Connecting, analysis and processing of FMCW radar level meter difference frequency signal are completed.