Advanced Materials Research Vols. 989-994

Abstract: The signal noise ratio (SNR) of telemetry signals is low in the environment of reentry telemetry, MSD(Multi-Symbol Detection) technology can effectively improve PCM/FM telemetry signal demodulation performance. In view of the problem that maximum likelihood value is misjudged leaded by the noise in the process of reentry and doppler causing serious distortion of signal phase. A performance compensation method of MSD based on sliding strategy is researched: A MSD operation with N-1 element overlap before each MSD operation, where the each symbol sliding strategy sliding the length of 1 symbol. The simulation and test results verify the effectiveness of the improved algorithm.

Abstract: Signal processing speed is an important indicator of the performance of software based phase locked loop. Previous software uses data redundancy of phase locked loop based on parallel processing, but the amount of redundant data lead to the introduction of computer waste of resources, reducing efficiency and other issues. Design of a parallel processing method based on data blocks and redundant data segments dual dynamic partitioning, given the dynamic data partitioning strategy.

Abstract: Some existing methods for estimating image watermarking capacity may degenerate the quality of stego-image when the estimated capacity is achieved. In this paper, based on the Region of Interest (ROI) model, we discuss on the capacity problem and the quality of stego-images using PSNR. Considering the trade-off between capacity and quality, our method estimates the allowable distortion for each pixel in spatial domain in terms of the specific PSNR of stego-image. Experimental results show our method ensures a good control over the capacity without introducing artifacts.

Abstract: Aiming at soft soil foundation, this paper simulates the process of dynamic compaction on soft soil foundation by ABAQUS, and analyzes soil stress and displacement under the effect of same tamping energy on different drop height, ram. The law of consolidation on the soil foundation has been forecasted more accurately, which is more valuable for the similar project on dynamic compaction on soft soil foundation.

Abstract: We explore the relationship between the partial equilibrium and the global optimum from the problem of the shortest circuit for three villages (PSCTV). Using the related properties of Fermat point and the circumcenter of the triangle, we can come to the conclusion that the partial equilibrium sometimes brings into correspondence with the global optimum but there is a great deal of difference between the two by analysing the difference between the sum of distances from Fermat point to all vertices and the ones from circumcenter to all vertices.

Abstract: This paper proposes an adaptive discriminant linear local tangent space alignment algorithm DALLTSA. On the basis of LLTSA algorithm adding adaptive and discriminant gets DALLTSA.DALLTSA not only combines characteristics in DLLTSA that maintain the local geometry and meets the maximum between-class scatter matrix, but also dynamically selects K-neighbor better to reflect the degree of polymerization between samples. Finally, the face recognition experiments based on Gabor [1] filter and DALLTSA shows that this algorithm improves the recognition rate and robustness.

Abstract: This paper mainly studies on the superiority of a driving rule of freeway. Using the theory of cellular automaton, we definite two indexes and make evaluation and analysis of the Keep-Right-Except-To-Pass rule under different traffic load conditions. At last, comparing with one of the other rules, we prove the superiority of the common rule.

Abstract: NC lathe controls the action of the lathe through program control system, while programming mistakes may lead to collisions between NC lathe cutters and workpieces or fixtures. A collision detection system judge whether there are collisions ahead of time by means of reading the information of shape and pose of objects in processing environment, building a space model using CSG and acquring the movement intension of objects. Dividing the modeling space into space nodes using octree, building AABBs of objects to be tested and locating them at certain space nodes, only objects at the same node or the same father node need to be tested, thus testing speed is raised.

Abstract: Image information hiding is a way of concealing secret information within another image or file. The previous researches of image information hiding extract secret by calculating. An algorithm based on HVS (Human Visual System) is proposed in this paper. We first decide the embedding region and embedding strength of secret image based on edge and texture information. Then, a pair of invert images is chosen as the cover images, and the stego images are constructed by modifying the pixels of the cover images through the proposed criterion. Correspondingly, the secret image can be recovered through overlaying the two stego images.

Abstract: A method of multiplier is presented for solving optimization problems. For large-scale constraint problems, combining the active set strategy, we use the aggregate function to approximate the max-value function. Only a few of functions are involved at each iteration, so the computation for gradient is significantly reduced. The numerical results show that the method is effective.