Advanced Materials Research Vols. 1044-1045

Abstract: Previous studies have indicated that the chronic effects of exposure to low-frequency noise causes annoyance. However, during the past two decades, most studies have employed questionnaires to characterize the effects of noise on psychosomatic responses. This study investigated cardiovascular activity changes in exposure to low-frequency noise for various noise intensities by using recurrence plot analysis of heart rate variability (HRV) estimation. The authors hypothesized that distinct noise intensities affect cardiovascular activity, which would be reflected in the HRV and recurrence quantification analysis (RQA) parameters. The test intensities of noises were no noise, 70-dBC, 80-dBC, and 90-dBC. Each noise level was sustained for 5 min, and the electrocardiogram (ECG) was recorded simultaneously. The cardiovascular responses were evaluated using RQA of the beat-to-beat (RR) intervals obtained from ECG signals. The results showed that the mean RR interval variability and mean blood pressure did not substantially change relative to the noise levels. However, the length of the longest diagonal line (L_max) of the RQA of the background noise (no noise) condition was significantly lower than the 70-dBC, 80-dBC, and 90-dBC noise levels. The laminarity showed significant changes in the noise levels of various intensities. In conclusion, the RQA-based measures appear to be an effective tool for exposure to low-frequency noise, even in short-term HRV time series.

Abstract: Feature selection is an effective pre-processing technology to facilitate text mining on high dimensional feature space. In recent years, many effective redundant feature selection methods have been proposed from different motivations. However, a comparative experimental study on redundant feature selection methods in the field of text mining has not been reported yet. In order to solve this problem, an extensive empirical comparative study with the task of text classification is given in the paper. The experimental results indicate that the 3-way Mutual Information represents the redundancy much better than traditional 2-way Mutual Information, since the label information are considered by 3-way Mutual Information. As a result, the performances of redundant feature selection methods based on 3-way Mutual Information overwhelm other methods.

Abstract: Mobile payment has been rapid developed, but existing mobile payment platforms are not perfect. This paper focuses on research and design of mobile payment platform. A mobile payment platform based on hybrid APP technology is proposed. Hybrid APP technology perfectly integrates web APP with native APP. It is current mainstream app technology and has been widely used in mobile enterprise application. The solution based on hybrid APP offers beneficial reference for the construction of future mobile payment platform.

Abstract: Computer Thinking is the core content of Computer Basic knowledge. With the full implementation of quality education in order to cultivate the innovative spirit and practical ability, computer thinking knowledge and skills are necessary for current college students. Aimed at the, the paper puts forward Visualization teaching methods and use typical cases in teaching experience of College Computer Foundation, which will help students have access to professional knowledge and skills about computer science.

Abstract: In order to meet the current needs of the report dealing with large volumes of data, operation difficulties of data sources, fixed form and other issues, The paper raises that basing on principles of modular and hierarchical design thinking, preprocess various data sources in dimension, store in special data base, then dynamically generate report through a combination of different dimensions in the hierarchy. The report system in this paper is designed 4-layer architecture in hierarchical relationship, ensuring that coupling value of each part of the system is a minimum, and this improves system module’s universality and the efficiency of dynamic report system’s deployment and execution.

Abstract: Reconfigurable virtual instrument measurement model was put forward based on mobile terminal according to the problem of poor mobility and real-time performance in traditional test system. Research a dynamic communication mode in network space, reconfigurable virtual instrument library was developed in mobile devices which is support Android Operating System, and the networked wireless test was carried on, realized the function of reconfigurable virtual instrument test system on mobile terminal.

Abstract: Aiming at the folds caused by the sparse data in the process of DTM (Digital Terrain Model), this article proposed a method of interpolating spatial control points based on Delaunay triangulation and Kriging interpolation algorithm. The terrain data of an area with complex terrain in Xianyang was used to construct terrain model according to the proposed algorithm. Experimental results show that the method can finish the interpolation of the terrain denser data quickly and accurately, and it provides an efficient technological tool for building a true three-dimensional terrain model.

Abstract: This thesis takes AIO (All-In-One) type of RF-EAS systems as the object, to study how to improve its anti-interference performance. Interference noise in the article is divided into two types, which are steady noise and transient noise. According to the characteristics of different interference noises, their impacts on all aspects of the system are fully analyzed, and then, we give a series of targeted hardware and software measures. Finally in this paper, the adaptability of the system is studied, and we presented a feasible way to improve the anti-interference ability and stability of the system.

Abstract: This dissertation discusses dedicated Connection Ending Protocol (CEP) in the application layer of Single-layer User-data Switching Platform Architecture (SUPA). This paper analyzes data unit format of CEP, discussed the protocol data unit of CEP(CEP-PDU), the working process of CEP and exception handling. This paper focuses on the removal of negotiations on the basis of three-way handshake to achieve the removal and treatment of abnormal connections.

Abstract: Aiming at the shortcomings of HS Algorithm and LK Algorithm which the algotithm are too completed and the computing quliquanties are large; this paper brings forward Fast-speed Dirrerential Light-flow method, and verifies the feasibility of this mathod by Matlab Software.