Applied Mechanics and Materials Vols. 530-531

Abstract: This paper analyzes LRU page-replacement algorithms, and points out that LRU is closest to OPT among all possible page-replacement algorithms. It studies the four possible methods for LRU algorithm: measurement of time, count of number, use of registers, and use of stack. Data structures and implementation methods are proposed; approximation algorithms are discussed. This paper also analyzes the performances and reliability of different LRU page-replacement algorithms, providing some basic information for us to choose them in different systems.

Abstract: The page replacement algorithm is an very important step which realize virtual memory control. A good page replacement algorithm can reduce the fault frequency when program executing, reduce the number of I/O, and then increase the systems efficiency effectively. In this paper, we studied the principle of various of page replacement algorithm, designed an program which simulated the procession and result of page replacement algorithm, in this program, we assume a few condition, record the experiment results. According to these data, we compared and analyzed the page fault and page fault frequency of different algorithm, and compare their performance.

Abstract: The application of virtual reality technology is a hyperlink on a web, multi-user interaction, computer platform-independent modeling and rendering three-dimensional graphics technology. Dressing is using three-dimensional virtual reality systems such real-time, via the user with the mouse or keyboard to control the direction of view, the scene model arbitrary move and zoom, real-time rendering every angle view of the effect of wearing apparel. This study mainly done for the creation and analysis of three-dimensional human data fitting system, three-dimensional three-dimensional body.

Abstract: Horizontal axis rotor wave energy converter is a new form for utilization of ocean wave energy, and the axis of its water turbine is parallel with the sea level and perpendicular to the direction of wave. This paper employed the linear wave theory and Froude-Krylov presumptive method to calculate the wave force, which was exerted on the wave energy converter in extremely arduous wave conditions. The finite element research on the deformation and the stress response of the water turbine was carried out to assess its security. The results show that the deformation and the stress responses both reach their maximum values at the 3rd mode shape about 90Hz, and the deformation response is 0.4208mm and the stress response is 0.8052MPa at this frequency, which are both within the required security range.

Abstract: Screw pressing technology provides a pressing process superior to those traditional ones. Screw press has been used in oil extraction with a long history, both for cold and hot pressing of vegetable oil materials. Pressing screw is the core component of screw press, as a very important working part, its strength is a precondition for ensuring normal operation of the whole machine. Considering the complexity and drawbacks of conventional analysis and check methods for pressing screw, a simplified three-dimensional model of which was set up, then finite element analysis was done, thus obtaining its continuous deformation and stress distribution with the results close to those from theoretical calculation. Hence, this method can be applied to rapidly and correctly find those dangerous positions and existing imperfections of its structure, thus providing valuable data to judge its structural rationality before practical manufacture, so as to make further improvements and optimizations for its structural design.

Abstract: Traditional Chinese hairstyle is an important part of the traditional Chinese culture, which provides rich material for computer animation. The creation process of traditional Chinese hairstyle model in computer animation is complex working and time-consuming. This study establishes the traditional Chinese hairstyle database, which covers from Tang Dynasty to Qing Dynasty. According to the characteristics of the traditional Chinese hairstyle, this study develops an Intelligent Traditional Chinese Hairstyle System by MEL, which can display the condition of traditional Chinese hairstyle models in real time and change attributes related with models efficiently. The system is the combination among computer technology, animation art and traditional Chinese culture. It will improve the efficiency and quality in the computer animation creation.

Abstract: To increase the efficiency of golf training, 3D swing reconstruction is broadly used among golf researchers. Traditional reconstruction methods apply motion capture system (MOCAP) to gain golfers motion data and drive bio-mechanical model directly. The cost of MOCAP system restricts the application area of golf research and the reconstruction quality of swing relies on the accuracy of the motion data. We introduced the dynamical analysis into swing reconstruction and proposed a Dynamic Bayesian Network (DBN) model with Kinect to capture the swing motion. Our model focused on modeling the bio-mechanical and dynamical relationships between key joints of golfer during swing. The positions of key joints were updated by the model and were used as motion data to reconstruct golf swing. Experimental results show that our results are comparable with the ones acquired by optical MOCAP system in accuracy and can reconstruct the golf swing with much lower cost.

Abstract: Combined with a foundation pit in kunming, the paper use the finite-difference software flac3d to establish engineering model and carry on the numerical simulation to simulate the excavation on the initial engineering condition of the double-row piles retaining structure. Summarize the calculation results when change the distance of the pile-rows and the length of the piles to analyze the results differences and changing law. The conclusion has some practical value in engineering.

Abstract: With the development of transportation, subway is more and more important to every city, but the security of underground railway track faces with serious challenges. Tunnel excavation cross-section types have rectangle, roundness, arch, composite one and so on. In the tunnel excavation under Feng-tian Road in Chongqing, we chose three cross-section types for obtaining optimal scheme by finite element method (FEM). The efficiency and reliability of the optimized tunnel excavation cross-section were demonstrated by simulation results by FEM software Abaqus, and the tunnel excavation engineering under Feng-tian Road in Chongqing. Hope that this work can provide a reference to other tunnel excavation engineering.

Abstract: Due to the promotion of modern design feature, the placement solution is becoming more and more difficult to route. Previous routability-driven based technology is usually coupled with the original placer, which is difficult to be widely used in various placement tools. In this paper, we proposed a tool called CRT (Congestion Refinement Technique), which is independent of any placer and any router, and can be applied to various placemen to improve the routability. CRT is a congestion-driven based module shifting technique. Basically, CRT is one kind of technology that better allocating routing resources by shifting the modules. The boundary of tile is shifted in the horizontal and vertical directions without affecting the original placement. Here a longest path solution is presented to solve the problem fast and effectively. The experimental results show that the CRT can effectively alleviate the congestion of unroutable placement solutions. We apply it to placement solutions generated by placers on ISPD2011 [ placement benchmarks. From the result we can see that CRT greatly improves the routbility and saves execution time for the routing stage after refinement.