Applied Mechanics and Materials Vols. 121-126

Abstract: With the larger and more complex of the size and function of software products，choosing an efficient modeling technique for analyzing complicated and ever-changing system plays a vital role．Object-Oriented Petri nets for its unique characteristics which are simple and laconic modeling method and strong mathematical analysis capacity becomes a hot research．In this paper，it explain that the object-oriented technology how to combine with Petri nets．The typical Object-Oriented Petri net modeling steps and analysis methods are expounded. Up-to-date research about OOPN and its main improved models OOCPN, OOAPN and OOTPN are summarized, the pros and cons of each modeling are analyzed．The interrelated topics and the future development about OOPN are also mentioned．

Abstract: The stereo matching algorithm based on aligning genomic sequence is proposed in the paper. This method is divided in three steps: do genomic sequence on the same name epipolar of stereo matching, get branch matrix by establishing genomic sequences using the same name epipolar after being genomic sequences, control points technology and dynamic backdate method to get disparity. The experimental results show that stereo matching method based on genomic sequences has fast speed and good matching quality.

Abstract: New media technology changes our communication way and communication object, and also every aspect of our life, including communication, study, working, etc.. Visual language is a part of these aspects. Visual language, especially visual language of graphic design relies heavily on technology development. From petroglyph to the invention of printing, then to the application of computer, Internet, and satcom technologies, for human communication, each technology has revolutionary significance. This paper mainly discusses influence and meaning of new media on visual language of graphic design, as well as consideration of future development.

Abstract: In order to improve the accuracy of near infrared multispectral ice detection on aircraft wings, we present an improved unit detection algorithm to reduce the noise influenced by the ice detection system itself. The improved algorithm, first select matrices being 3*3 as a detection unit, then calculate the contrast value of the five pixel points in the cross region of the unit, and finally count the number of pixel points, whose contrast value are larger than the threshold value of ice on the surface. The experimental results show that the unit detection method has high accuracy and efficiency compared with conventional point-by-point method.

Abstract: The free response function is the foundation of mode analysis and recognition of vibration signal, and random decrement algorithm is the commonly used classical algorithm of extracting the free response function. But under the restriction of engineering conditions, it may be impossible for long-time signal acquisition, which makes the number of sample points fail to meet the requirements of the random decrement algorithm, causing the extracted free response signals to contain strong noise and other influencing factors. Aiming at the shortcomings of the existing random decrement technique, this paper proposes an improved random decrement algorithm based on multi-secant method, which can get satisfactory free response signals with short vibration response signals to provide excellent basis of analysis for the vibration mode recognition algorithm of various time-frequency domains. Actual engineering tests confirm that the improved algorithm greatly improves the precision of extracting free response signals while basically keeping the computation speed unchanged, it has high application value.

Abstract: Camera calibration is one of the key technologies of Computer Vision. This paper presented a microscope camera calibration method based on grid sub-pixel corner detection for the particular application area of microscopic measurement. First of all, the actual corner coordinates information of the grid was obtained through the improved Harris corner detection method. Then, considering the distribution law of corner coordinates in the microscopic image, the paper obtained the sub-pixel corner coordinates by combining the quadratic surface and linear fitting. Finally, through the established non-linear camera model, the average error between fore-projection and re-projection grid corner coordinates was obtained by re-projecting the grid corner coordinates. Experimental results show that the sub-pixel corner detection algorithm is accurate and the final calibration error is 0.4637 pixels. Compared with improved Harris corner detection, the accuracy increased by about 52%, which is applicable to microscopic camera calibration.

Abstract: This paper introduces that the representation and storage of hierarchical model via a database table, achieves the dynamic generation and management of model. It main achieves model base based on AHP. That addresses a number of unstructured or semi-structured problems such as assessment and prediction in the modeling. Focusing on the creation of their corresponding AHP-based method base is to solve practical problems. Experiments show that this method base can be well integrated with model base. So it will be applied in common AHP cases.

Abstract: Owners, contractors and supervisors are key members included in construction projects. There are two kinds of principal-agent relationships among the three parties. Out of the consideration of maximizing the interests of owners, the author of this article integrates the three parties--owners, contractors and supervisors into a mathematical model, designs corresponding anti-conspiracy constraint method to prevent the conspiracy act of contractors and supervisors, and studies the game relationship among the three parties--owners, contractors and supervisors using the principal - agent theory.

Abstract: Some methods on calculating a nonlinear Common Social Science Field Numerical Integration are proposed in this paper. It mainly concentrated on the comparison among the composite trapezoidal method, the trapezoidal method, the simpsons' method and the romberg’s method on integrating efficiency. It expressed the different application scales of these methods through strict numerical analysis with C programming results.

Abstract: Articulatory vibrating screen is composed of multi-section screen with articulatory vibrating. The principle of even-thickness screening is referenced on its layout, with linear vibrating screen as the discharge end, with round vibrating screens as the feeding end, and also the intermediate screen. In accordance with the structural features of articulatory vibrating screen and under the condition of assembly module in Pro/E, mechanical components of articulatory vibrating screen are assembled in the light of the arrangement, the sequence, the restrictions and the modifications of installation. With the visualized research on the operational process, the three-dimensional illustrations of assembly model are established to ensure the correct design on every mechanical component of articulatory vibrating screen. The finite element model of vibrating screen is set up by its analysis software to carry out the analysis of finite element calculation and modal according to two operating modes of the regular work and the machine halt beyond resonance region. The analysis result indicates that the intensity and the rigidity of the vibrating screen are safe; the machine operation is stable; and no resonance phenomenon would happen. This study provides the theoretical reference for the design of similar machinery. It is of practical importance and economic value to apply the visualized design method into the design of articulatory vibrating screen.