Applied Mechanics and Materials Vols. 513-517

Abstract: The workflow management system plays an important role in enterprise information management system. An enterprise workflow contains a lot of business process and their relevancies. These relevancies are important in building workflow management system. This paper proposes a business relevance based workflow localization method to divide the workflow locally. In this method, a workflow is treated as a combination of local processes; therefore single task can be divided into several subtasks. This method can reduce the difficulty and improve the efficiency in building workflow management system. This method has been practically applied to the design and development of steel pipe production supervision control system. The actual results validate the effectiveness of the proposed workflow localization method.

Abstract: The selection mode for technology transfer plays a significant role along with whole process of technology transfer because its methods and approaches could impact the progress and effect of technology transfer, which also fundamentally influence on regional sustainable development. To construct a selection model for monitoring technology transfer, we firstly examined influential factors related with technology transfer from four perspectives, such as regional development, supplies and recipient of technology, transferred technology and transfer modes. Then we drafted a roadmap for technology transfer, and built up the selection model of technology transfer mode with multivariate conditional LOGIT theory. The research contribution in this paper could be used for monitoring on mode selection for technology transfer, which could influence on regional sustainable development both directly and indirectly.

Abstract: Foot trajectory is a significant factor which affects the movenent performances of the hexapod robot directly. In order to plan efficient and effective foot trajectories for different terrains, the kinematics of the robot is analyzed and two kinds of parametric foot trajectories for different terrains are proposed to achieve foot transfer between the footholds efficiently in this paper. To verify the effectiveness of the parametric foot trajectory planning method, different simulations tailored for a virtual prototype have been conducted. The results certify that the robot can plan an appropriate parametric foot trajectory for differnt terrains efficiently only by setting key parameters and this trajectory can be executed easily by revolving joints harmonically.

Abstract: Based on literature study, three principles of identifying benchmark were formulated, and four general approaches of benchmark recognition were summarized. We adopted Beijing sustainable development indicators as a sample to test each approach, with which we could compare the results and analyze the characteristics, advantages, disadvantages as well as suitability. The research results showed that indicators with different characters should be treated with different approaches for benchmark identification.

Abstract: Motion edge extraction is the object of most motion segmentation methods. We have proposed a motion edge extraction method in our previous work. However, if the camera swings, a number of background edges are classified into foreground edges. In order to solve this problem, we propose a background pixel relating method to modify the motion model and to remove those misclassified edges. At the end of this paper, we use the CAVIAR project test sequence to test our method. The result is satisfactory.

Abstract: An non-vertical stereoscopic 3-D display method by changing the parallax value of the parallax images is proposed. This method is capable of displaying virtual reality with high-immersion sense because the observing depth only depends on the parallax value. An experimental 3-D display system capable of producing high-immersion and virtual reality video images at 45 degree is developed. Furthermore, the effectiveness of the method is demonstrated by using this system.

Abstract: High stability of semiconductor lasers have been shown useful in many applications areas,^[such as optical communication, high-resolution spectroscopy quantum metrology, laser cooling and trapping^[. With the rapid development of fiber optic dense wavelength division multiplexing system, we require laser source with high frequency stability in 1.5μm band. In this paper It is clear that temperature, cavity length and injection current have effects on frequency stability of FBG external cavity semiconductor laser by simulation experiments. Besides that, the frequency stabilization system is adjusted. Therefore, the frequency jitter spectra before and after locking are given and the experimental results are analyzed. The results show that after locking laser the typical frequency jitter is significantly improved comparing with frequency fluctuation in the condition of free running.

Abstract: A novel method to automatically generate the depth map is presented, when the depth maps of reference images located before and after the target image in the same image sequence are given. A novel grid dividing method and a joint feature response model are proposed to adaptively select trace points, and an image deformation algorithm is given to track depth maps with the trace points. Experimental results show that the proposed method can generate depth maps effectively and accurately, which can meet the industrial needs in 2D-3D conversion.

Abstract: In order to improve the automation level of wrecker, fuzzy PID controller for the uprighting was proposed. First, the uprighting model was built in this article. Then, the hydraulic circuit of wrecker uprighting system was built in AMESim. Furthermore, the fuzzy PID controller and the conventional PID controller were simulated respectively in Matlab\Simulink software based on this model. Simulation results show that the fuzzy PID controller has faster step response speed and smaller overshoot than that of the conventional PID controller. The uprighting can be accomplished automatically and smoothly by virtue of the fuzzy PID controller.

Abstract: As a kind of typical on-orbit capture and aberrance technology, space tether de-orbit system has broad application prospect in terms of cleaning space debris and abandoned satellites. In the paper, the attitude dynamics equations of the tether de-orbit system is established based on law of moment of momentum; Against the background of de-orbiting under a constant thrust in the tangential direction, the optimized PD control law with limited attitude feedback on jet control and momentum wheel control is designed for the mission satellite; The oscillation characteristics of the attitude of abandoned satellite are studied, and the effect of the oscillation on the tethered system and based satellite are analyzed; According to the demand for maintaining the position and suppressing the oscillation of the abandoned satellite, a kind of tension control method is put forward. Numerical simulation results indicate that the abandoned satellite oscillates at a specific angular frequency, and the large amplitude threatens the stabilization of tethered system; the designed tension control method effectively eliminate the oscillation of the abandoned satellite and ensure the flight safety of the tether de-orbit system, with economic energy consumption for the control of the based satellite.