Applied Mechanics and Materials Vols. 427-429

Abstract: A new self-expandable packer test-bed for performance testing is developed against many problems of self-expandable packer test-beds which are in existence during detection process, for instance, imitative open hole cannot be used to detect environments in the downhole, size of a specimen for detection is undersize, pressure in experiments is low and detailed data cannot be gathered in development phrase. The new test-bed makes autoclave a modular design, which can test various performance of a specimen in a high-pressure environment and match relevant replacement parts of autoclave with the purpose of doing a variety of experiments on specimens. In this way, many existing problems of test-bed during the experiments can be solved.

Abstract: A robust beamformer with pseudo-interference approach for reducing the effect of mutual coupling is present in this paper. This technique uses injected interference to improve the equivalent interference-to-noise ratio in the diagonally loaded Capon beamformer. The mutual coupling coefficients are estimated for interference correlation matrix reconstruction. The resulted beamformer is insensitive to the mutual coupling effects and angular mismatch.

Abstract: Aiming to the ERD/ERS phenomenon of left-right hand imaginary movement, this paper presents a method of wavelet transform combined with statistical analysis to extract EEG features evoked by imaginary movement. And the features were classified using the support vector machine based on RBF kernel and cross-validation accuracy (CVA) method. The results have shown that this method can perform effectively to extract features and reflect ERS and ERD characteristics of EEG signal. The accuracy of classification can reach 90% within the time costing 3.5 seconds. The highest signal to noise ratio is 1.445, and the maximum mutual information is 0.645bit. The results can meet the real-time brain-computer interface system.

Abstract: In order to solve the problems of complex process of decryption and high cost when shifting the key codes of optical encrypted watermark, a method of applying double random amplitude-phase encryption to digital watermarking is introduced. The encrypted ESPI watermark is obtained by random amplitude-phase optical encryption based on normal speckle interference. An encrypted Fourier transform-ESPI watermarking scheme and an encrypted digital holography-ESPI watermarking scheme are introduced. Computer Simulation results show the feasibility of the new schemes. The compared results of image processing show that the encrypted ESPI watermark has good compatibility when combined with Fourier transform watermarking and digital holographic watermarking.

Abstract: The snowman CAT is a kind of domestic computer aided translation software, compared with other mainstream snowman CAT software, such as SDL Trados, Deja Vu, Wordfast, memoQ, and YaXin snowman CAT, the learning curve about snowman CAT is not steep, but function has not a halfpenny the worse, in addition to the software its humanized design and easy-to-use properties that make it became the first introduction to snowman CAT teaching software. This paper attempts to functional analysis on snowman CAT 1.29 Chinese-English standard edition in systemic, so as to provide reference to classroom teaching of the computer aided translation.

Abstract: According to the rich practical experience of the effective English teaching field, scientific research experience and the actual investigation, the author comprehensively analyzed the present situation of current college English listening teaching, conducted the English teaching mode that based on podcasting technology, used bilateral W-test of effective results, and the count materials were dealt with test, eventually the author obtained that the achievement of college English listening teaching based on podcasting technology was significant, it could effectively improve the level of English listening, and at the same time it provided the new teaching mode and scientific path for the college English listening teaching.

Abstract: With the introduction of frequent curriculum reform and information technology, it has changed the nature of foreign language teaching work to a certain extent. Foreign language teachers are shaken and overturned by the original teachers identity. Now foreign language teachers identity research has become the current hot topic in new era. This paper uses seven-layers model of educational service to analyze the current situation of foreign language teachers identity, then uses hardware and software to research on the training courses and teachers professional development community and other resources. Finally, the teaching method, school and district levels service facilities will be integrated into efficient teaching, in order to improve teaching quality. This method can solve the identity of the foreign language teachers professional development. At the same time, it also provides a certain degree of reference on other subjects teachers identity.

Abstract: Research on Primate visual cortex (V1 area) neurons orientation coding mechanism is the base of revealing the whole visual cortex information processing mechanism. Firstly, this paper adopted different orientation grating to stimulate visually on rats. Meanwhile, gather response signals of population neurons from V1 area using multi-electrode arrays. Then, screen effective response channels according to the orientation selection of different neurons in different channels. Besides, extract Spike average fire rate and LFPγ band power feature in every effective channel signals within specific stimulus response time to construct population response joint features. Finally, taking Lasso regression model as coding model, use joint features to differentiate grating orientation, in order to research on V1 areas population neurons orientation coding. The consequences indicate that the results of population response joint features coding for six different orientation are superior to the results of any single feature of population response coding, and remarkably better than the results of single channel response feature coding.

Abstract: According to the application of the computer network multimedia is more and more widely, and is also correspondingly strong shock by the network media and informatization for network communication and other requirements, progress and development of society constantly threatened by the impact of network multimedia communication. The paper theory-based with network multimedia communication to analysis the characteristics and performance requirements of network multimedia communication, combining to relevant material of the data flow, research and analyze the data flow of the mining technology, to carries on system analysis of the data flow, construct system model based on the network multimedia communication data stream, in order to better guide the dynamic analysis to network multimedia communication data flow, to master the multimedia communication data fusion and decision, so as to understand the users needs to network multimedia communication, to better guide the sustainable development of the network multimedia communication.

Abstract: In the 21st century, with the rapid development of computer science and technology, the usage of all kinds of embedded system is increasingly common. The function of the embedded system is more and more strong, and there has many kinds of embedded systems, the range of application is gradually expanded. With the requirements of application, embedded system experienced the changes from single application system to integrated system. However, because the current integrated systems mostly are limited to the stand-alone usage, this does not give full play to the application and function of the embedded system. The paper was based on the limitations of XML embedded system of the J2ME platform, and it provided optimization design to current limitations, at the same time it made the application and function get the promotion.