Advanced Materials Research Vols. 271-273

Abstract: A Multimedia Emergency Communication System based on Wireless Mesh Network in Coal Mine(MECS-WMN) is proposed. Audio, video, environmental data (methane, oxygen, temperature, carbon monoxide, hydrogen sulfide) and rescue personnel position information of Disaster Site, which captured by mining multimedia Terminals are transmitted through the Wireless Mesh Network to Mine Rescue Base and Ground Rescue Center in real-time. The program of using current wireless AP signal strength determines the next AP laying location to solve the problem "Fast Network Rollout, Plug and Play" of MECS-WMN. The experiment results show that the program truly implements real-time communications between rescue workers and command bases, which plays an important role in emergency communication and mine safety.

Abstract: In order to dispose sensors to reasonable freedom degrees, and reflect adequately the dynamic characteristics of tested structure, the sensor locations of dynamic testing must be optimized. In this paper, taking MAC matrix, Fisher information matrix (FIM), and their combinations as optimization criteria respectively, the particle swarm optimization (PSO) was applied to the optimal sensor location problem (OSLP). The effect of optimization criteria and optimal method to optimal sensor locations were discussed. According to the optimized results, we can arrived at the following conclusions: using MAC and FIM as optimal criteria, introducing the PSO into the OSLP, the optimal sensor locations can ensure the better linear independence of the mode shape vectors and the better estimation of the experimental modal parameters.

Abstract: In the dynamic testing, the sensor positions have a major influence on the quality of the experimental modal parameters of a tested structure. In order to dispose sensors to reasonable degrees of freedom (DOF), and reflect adequately the dynamic characteristics of tested structure, the sensor positions must be optimized. In this paper, taking the combination of MAC matrix and Fisher information matrix (FIM) as optimization criteria, the integer-coded genetic algorithm (IGA) was applied to optimal sensor position problem (OSPP). The effect of optimization criteria and optimal method to optimal sensor positions were discussed. According to the results, the following conclusion is obtained: using MAC and FIM as optimal criteria, introducing the IGA into the OSPP, the optimal sensor positions can ensure the better linear independence of the mode shape vectors and the better estimation of the experimental modal parameters. Comparing with three existing optimal sensor placement methods, which are Guyan, effective independence (EI), and cumulative method based on QR decomposition (CQRD), their results of the optimal sensor positions indicated that the IGA is better than them.

Abstract: The analysis technology of Information hiding is introduced. Through the analysis of examples of the different carriers embedded in the same format images and the same carriers embedded in different format images, difference histogram can be used to detect the information hiding in least significant bit. Then, the validity of forgoing method is shown by simulation.

Abstract: With the widely used of software technology, how to build a trusted software system has become a hot topic in the academic field. However, to the multi-channel and multi-option of the realization for software systems, how to optimization and selection the requirement has become an important issue. Based on the AGORA extended model, this paper proposes a requirement optimization and selection method with some indicators, such as development costs, correctness and consistency.

Abstract: We present a servo control model in a particle filter to realize robust visual object tracking. Particle filter has attracted much attention due to its robust tracking performance in cluttered environments. However, most methods are in the mode of moving object and stationary camera, as a result, the tracking will become failure if the object goes out of the field of view of the camera. In this paper, a closed loop control model based on speed regulation is proposed to drive the pan/tilt/zoom(PTZ) camera to keep the target in the center of the camera angle. The experiment result shows that our system can track the moving object well, and can always keep the object in the middle of the field of view. The system is computationally efficient and can run in real-time completely.

Abstract: A number of serious security issues have already occurred with the rapid deployment of electronic transaction. One approach to guaranteeing security is the public key infrastructure (PKI). PKI provides a structure of trust among its users or principals. However there are serious PKI implementation issues as different countries and different organizations may adopt different security policies and implementations. This raises the question of interoperation between these various implementations. In the paper, the author proposes a new solution using VA (Validation Authority) to achieve the digital certificate validation and resolve the general PKI interoperation problem.

Abstract: Soil erosion processes and erosion distribution was research focus to establish distributed mathematical equation in the soil erosion areas, GIS techniques and fractal theory provide a means to advance these studies.Slope erosion patterns of bare slope was studied under rainfall intensities of 45、90 and 130mm/h with 20°slope gradient using simulated rainfall experiment. The results showed that the time of rill appeared of lower rainfall intensity was later than that of high rainfall intensity；Within the rainfall time，the rill scale expanded increased with the increasing of rainfall intensity; The erosion distribution was studied by the three-dimensional laser scanner，The trend of rill erosion deep kept roughly consistent with that of sediment; The characteristics was analyzed of slope erosion by GIS, the fractal dimension and sediment were both increased with rainfall intensity, The fractal dimension was increasing with erosion pattern complexity. So the fractal dimension is the representative of erosion complexity.

Abstract: GIS technology and fractal theory provide a powerful tools in the soil erosion study.Based on GIS and three-dimensional laser，and under rainfall intensities of 45, 90 and 130mm/h with 20°slope gradient using simulated rainfall experiment, Amount of erosion , fractal dimensions and Hydraulic parameters were studied from different slope positions, Which was up-slope mid-slope and low-slope, The results showed that the distribution of erosion along the slope was difference in different rainfall intensity. the fractal dimensions increased along the slope，It indicated that the complexity of erosion increased with slope length. Reynolds number, Froude number, Darcy-weisbach drag coefficient and the shear stress were the important hydraulic parameters to study the soil erosion process and soil erosion mechanism. They were showed the same or the opposite trend with fractal dimensions, taking into the erosion distribution and erosion development process, Dynamics of soil erosion could be further advance.

Abstract: Due to the particularity of business administration, the students should not only possess systematized expertise，but also focus on the practical social and managerial competence. On the basis of the analysis concerning the current situation of cultivating mode for the innovative talents in business administration in China, this paper puts forward the new methods of the cultivating mode for the innovative talents in business administration, which is significant for the universities and colleges to train the useful professionals of management.