Advanced Materials Research Vols. 225-226

Abstract: It needs a mass of data to correctly reflect a good many of complex factors and the performance of cement in the process of hydrating, researches of home and abroad are focus on data forecast by experiments and the Neural Network. The intelligent algorithm combined the Particles Algorithm and the Neural Network is used in this paper. The intelligent algorithm is applied in the process of the cement hydrating to forecast the relationship between the particle size distribution of coal gangue and expansible degree of cement.

Abstract: To improve the effectiveness of management measure for the information security, the parallel control approach is employed to the optimization of information security management measure. The simulation software Extend is applied to build the artificial system of information security management system, and the information security management measure is evaluated via the artificial system. A parallel control system is applied to achieve the interaction between the true system and the artificial system to minimize their difference. The computational experiment method is used to continuously adjust the information security management measure, and obtains the satisfied information security management measure finally. Take the public Internet network management as example to illustrate this method can achieve the real-time simulation, evaluation and optimization of information security management measure.

Abstract: The current Synchro-to-Digital conversion (S/DC)with high reliability, high accuracy and widely used in the military field, but it has high cost and low tracking speed, not suitable for high speed and low-cost industrial applications. In this work, the principle of synchro and the harmonics of the synchro output signals are investigated. Multifunction S/DC software design using FFT algorithm and IIR digital filter technology is proposed. It Integrated many functions, such as angle position, harmonics analysis and filter, it also improved measurement accuracy and speed, reduced the cost. The simulation results by Matlab show that the method is feasible.

Abstract: Icy and snowy pavement create obvious adverse impacts on road safety so that speed management is necessary for safety. According to the analysis of driver’s brake reaction time and vehicle’s brake distance on icy and snowy pavement, automobile’s parking distances were calculated and given under the condition of different speed and icy and snowy pavement types through observed friction coefficient data of snowy pavement, rough icy pavement, smooth icy pavement and icy-snowy pavement. The calculation method of maximum safe speeds under the condition of different icy and snowy pavement types and traffic volume were put forward. And suggestion values of car’s maximum safe speed when driving on icy and snowy pavement were given.

Abstract: Highly c-axis-oriented ZnO nanorods thin films were obtained on silica glass substrates by a simple solution-growth technique. The most compact and vertically-aligned ZnO nanorods thin film with the thickness of ~800 nm and average hexagonal grain size of ~200 nm exhibits the average visible transmittance 85%, refractive index 1.74, and packing density 0.84. As we demonstrate here, the solution-growth technique was used to produce high-quality and dense ZnO nanorods thin films, and is an easily controlled, low-temperature, low-cost, and large-scale process for the fabrication of optical-grade thin films.

Abstract: A mutual information function was defined as a criterion measuring the robustness of watermarking algorithm. Considering QIM scheme, error probability of watermarking can be calculated to validate the measurement of mutual information function. By mean of numerical computation, mutual information under Gaussian noise and uniform noise is calculated with change of noise standard deviation. In the experiment, an audio section is selected as the host and their third lever wavelet detail coefficients are quantified according to watermark bit series. Experiment results show that statistic Bit Error Rate (BER) is matched with evaluation conclusion of mutual information method when step is on the small side. Mutual information function can be selected as a cost function to evaluate the robustness of watermarking algorithm, and predict the BER.

Abstract: A de-noising method is proposed for 3DM-GX1 accelerometer signal based on kalman filter and average filter. This method can reduce the disturbance caused by vibration of vehicle motion and sensor itself, get acceleration accurately, and have advantages of easy realization and good real-time performance. A vehicle acceleration signal model is established with real acceleration noises as simulation signals based on kalman filter and average filter. Experiments based on real vehicle acceleration signal showed that the method could reflect the detailed information effectively by filtering noise, and it is very suitable for de-noising of vehicle acceleration signals which needs real-time application. The start, stop, advance and retreat action could be identify from the acceleration signal by using the proposed de-noising method based on kalman filter and average filter.

Abstract: To improve detection accuracy, Utilizing HMM (Hidden Markov model) and BW to building model, the detection accuracy improves greatly. First, the research progress of intrusion detection is recalled, then the model based on Markov and BW is presented. An example of using system call trace data which is used in intrusion detection, is given to illustrate the performance of this model. Finally, comparison of detection ability between the above detection method and others is given. It is found that the IDS based on HMM System Call sequence has improve the accuracy greatly.

Abstract: This paper studied the image tamper detection and recovery watermarking scheme based on the discrete wavelet transformation(DWT) and the singular value decomposition (SVD).By the property of DWT and SVD , we design two watermarks which are embedded into the high-frequency bands of the DWT domain.One watermark is from the U component of the SVD domain and used for detecting the intentional content modification and indicating the modified location, and another watermark is from the low-frequency of DWT and used for recovering the image. The watermark generation and watermark embedding are disposed in the image itself. The experimental results show that the proposed scheme can resist the mild modifications of digital image and be able to detect and recovery the malicious modifications precisely.

Abstract: Combined with a variety of ideas a Multi-swarm cooperative Perturbed Particle Swarm Optimization algorithm (MpPSO) is presented to improve the performance and to reduce the premature convergence of PSO. This algorithm includes the idea of multiple swarms to improve the evolution efficiency by information sharing between populations to avoid falling into local optimum caused by single population. It also includes the idea of perturbing the swarms beside the global best solution, which can escape from local optimum. Experiments show that the proposed algorithm MpPSO has better performance, better convergence and stability when comparing with the traditional and the recently improved particle swarm optimization.