Applied Mechanics and Materials Vols. 20-23

Abstract: Motion segmentation for dynamic scene is a fundamental problem in computer vision due to its well-known chicken-and-egg character. The key issue is to estimate both numbers and parameters of motions simultaneously. Different from global clustering method and random sampling scheme, in this paper, we propose a divided-and-conquer algorithm to solve the motion segmentation problem. A guided selection is used to choose the most creditable hypothetical motion as a candidate seed and then make it grow larger. Compared to previous works such as expectation maximization and factorization approaches, there is no need for any pre-knowledge of the number of motions. To global non-parametric clustering method, it is fast because each time we only do cluster process in a partitioned sub-set. Experiments have shown that the proposal method can give a satisfying result for motion segmentation.

Abstract: A trustworthy protected-ring model for UEFI firmware is proposed and a prototype based on Intel Platform Innovation Framework is implemented in this paper. In addition to meet static security attributes such as integrity and authenticity proposed in trusted firmware, this model can also satisfy some dynamic security attributes such as control object’s operations on device or modifications on key data. Furthermore, this model is simple and efficient enough to meet firmware’s need for small size and fast boot.

Abstract: . The paper focused on proposing a generic design for the structure model of semiconductor manufacturing. By means of analyzing traits of semiconductor manufacturing, stratifying on the definition of semiconductor manufacturing line, and analyzing the feasibility for computer to achieve the model design, a prototype system was achieved on .NET platform finally. The paper provided a solution consisted of a description of the standard model and a solution for computer development. And it’s a guidance for establishing research platform of semiconductor manufacturing scheduling

Abstract: Although UCON makes a unified framework for research on modern access control, it is not applicable enough due to fact that it only gives out a conceptual model. In this paper, analysis and extension have been made on UCON, role and task factors are introduced to it and combined with the conception of domain, an UCON extension model—UCONTR model, which is applicable to industrial control, is proposed. Its formalized description is given in the next step. Finally, the application of UCONTR on distributed control system for heat treatment is introduced in detail.

Abstract: Dimension error and surface quality have much different between each teeth of gear, moreover directly affect the gear work. After many times grinding, grinding speed and wheel contour of grinding wheel changed. This is primary reason of different between each teeth of grinded gear. Aiming at the problem, it is advanced the method of constant speed grinding and improved the tradition grinding machine structure, optimized the function of the wheel corrector using CNC technology. Machine improved can realize constant speed grinding, moreover can rapidly and accurately trim grinding wheel used complicate surface driving parts grinding. So improve grinding quality and increase grinding efficiency.

Abstract: To improve the poor performance of the maneuvering target tracking, Particle Filters (PF) and velocity constrained Particle Filters (VCPF) are introduced to track the maneuvering target. According to the prior information, outrange particles are discarded during prediction step, and the distribution and the weight of particles are adjusted. Simulation result shows that VCPF can track the maneuvering target stablely. Furthermore, the convergence rate and track accuracy of the algorithm can also be effectively improved.

Abstract: A new feature points extraction method is presented, which consider pixel as hexagonal. The method quasi increases the density of image pixel, expands the dynamic range of feature point extraction, increases the number of the features and resolves the problem of deformation of reconstruction which was leaded by lack of feature points. Firstly, the method was successful applied to sift operator of features extraction in this paper and then use dense stereo matching method to find the matching point of the image sequences. Secondly, through the RANSAC method to eliminate mistake matches, and by the camera matrix, calculate the corresponding points’ three-dimensional coordinates of space. Finally, the 3D model can be established through the partition merging triangulation method and texture mapping. Experimental results show that this method can get more accurate matches pairs and achieve a satisfactory effect of 3D reconstruction.

Abstract: This paper introduces a kind of measurement method of the height of liquid level by the tracking the use of angular displacement, aiming at the difficulties and problems of non-contact measurement for the height of liquid level in ultrasonic. Under the principle of the simultaneous tracking and laser light reflection, it realize the corresponding relationship between the liquid displacement and the light imaging based on the triangulation method. Thus to obtain the actual data of the height of liquid level. That to offer another new option for non-contact measurement.

Abstract: . The effects of quality management practices on product quality have been investigated extensively, but most of past studies conducted from empirical level, and the mechanism of how quality management practices lead to improvement of product quality is still unclear. Thus, this paper develops a conceptual framework for exploring the mechanism of how quality management practices result in enhancement of product quality from the perspective of explorative and exploitative learning.

Abstract: Compared with symmetric cryptosystem, asymmetric cryptosystem has much superiority in many application cases. Yet, the computation in a public key cryptosystem is much more complex than symmetric cryptosystem. In the paper, we applied HCC (Hyper-elliptic Curves Cryptosystem) as a typical fast public key cryptosystem into the designing of efficient blind signature scheme and presented an improved blind signature with fast cryptography algorithms. By utilizing probabilistic blinding algorithm, the scheme renders effective protection for the secrecy of original user, the signature generator or outer adversaries can not attack the secret message via the blinded information with effective polynomial algorithms. The scheme avoids the relevance between different signatures and interim parameters from the same original user, thus it effectively prevents signature forgery and replay attack. As security analysis for the scheme, we presented similar blind signature without relevant improving algorithms based on discrete logarithm cryptosystem. The analysis and comparison with other schemes both justify the security, reliability and high efficiency of the improved blind signature scheme regarding software and hardware application environment.