Applied Mechanics and Materials Vols. 121-126

Abstract: The thesis aims to characterize the mechanical properties and stresses for thin films deposited on the circular substrates. First, the thin films with the same deposition condition were successively deposited on the distinct substrates using the evaporation technique. The phase-shifting Twyman-Green interferometer (PSTGI) was then employed to measure the warpage of the film-substrate structures and therefore the intrinsic stresses and thermal stresses can be calculated from the well-known Stoney’s formula. The coefficients of thermal expansion (CTE) and Young’s modulus of thin films were also obtained from the Stoney’s theory. Furthermore, the merit of full-field character of optical interferometry was used to propose a novel methodology using the Chen and Ou’s theory to improve the accuracy and to reduce the experiment procedures in the traditional measurement of the aforementioned mechanical properties. Finally, the measured results corresponding to the traditional and proposed methods were respectively substituted into their adopted theories to compare their difference. The results reveal that the accuracy of proposed methodology is considerably improved and the experimental procedures are reduced to those of the traditional methods.

Abstract: This paper proposes an interactive augmented reality (AR) architecture for online computer supported collaborative work (CSCW). Current CSCW applications for AR are focused on multiple users met together to collaborate on the same physical environment. The proposed architecture can provide collaboration through computer network without the need of face-to-face communication. System architecture and operation scenario are firstly constructed. AR applications for machine assembly trainingis studied. The proposed interactive AR system architecture can provide new experiences for users and both the effectiveness and efficiency for online training applications can be significantly improved.

Abstract: This study aims to generate a risk evaluation methodology for the aged dam structure by coupling the micro and macro models created by hydraulic computation and discontinuous deformation analysis (DDA) with numerical manifold method (NMM), respectively. For the macro analysis, DDA+NMM is an energy-convergence algorithm and can be utilized to estimate critical loading based on the potential joints existing within the discontinuous block system. Due to the micro view, the relationship of groundwater level and precipitation can be studied by using hydraulic computation based on the groundwater flow equations. The proposed method presents an evaluation procedure for modeling an aged earth dam with efficient and economic open-source programs. As the result, the simulation can help determining the criterion of risk factors and the prevention strategy.

Abstract: Considering the rapid progress of information technology (IT) and volatility of the marketing environment, the past concept that enterprises run the whole show, has become insufficient in an environment so volatile, challenging and competitive, demonstrating the need of up and downstream supply chain cooperation to survive. Therefore, this research aims at the benefits and related functions of collaborative commerce concepts and knowledge management, constructing a system with the integration and application of collaborative commerce and knowledge management, and then explains the operation of this system through a system prototype, in hopes of proving the practicability of knowledge management and collaborative commerce integration, which will help enterprises gain better competitiveness.

Abstract: To reduce the fracture probability of InSb infrared detector in thermal shock from room temperature to 77K, for 16×16 mesa structure InSb infrared focal plane array detector with underfill, here ANSYS, is employed to research the impacts from both indium bump diameters and heights on both Von Mises stress and its distribution. Simulation results show that when the diameters of indium bump increases from 20µm to 36µm in step of 4µm, the maximal Von Mises stress in the InSb chip increases slowly. Besides, when the height of indium bump increases from 8μm to 24μm in step of 8μm, the maximal Von Mises stress in the InSb chip reduces from 1200MPa to 1030MPa. Von Mises stress of Si readout integrated circuits is also much smaller than that of InSb chip.

Abstract: The problem of automatic selection and configuration of base station sites in the dynamic scenario is investigated. We propose a intelligent approach based on Genetic Algorithm used to adjust the level of the antenna power and select the base stations’ site from the candidate sites. According to the users’ density the base stations adjust their antenna radiated power automatically. Results are given that most of base stations are powered off when the density becomes very low, and show that it will save lots of energy resources. Since this algorithm can adjust the status of base stations intelligently and automatically, it can be used in SON.

Abstract: We make an approach to the logic optimization algorithm including converting multi-valued logic into two-valued logic and converting two-valued logic into multi-valued logic. We discuss the algorithm converting two-valued logic into multi-valued logic on the basis of building an assignment graph and present multi-valued logic optimization algorithm. In this paper, we analyze and study the logic optimization algorithms based on mini-terms and design a software system on logic optimization. It overpasses testing of Benchmark and right validate and it shows that the function of the software system on logic optimization is good and the optimization efficiency is high by testing.

Abstract: In order to achieve higher recognition rate of unfertilized eggs, the paper proposes a new method based on the area feature of egg's vertical image and the classifier BP network. The eggs hatched 2-5 days are selected as the experiment objects in our study. Four kinds of feature, including the gray feature and the area feature extracted from the egg's vertical image and the egg's horizontal image, respectively, are sent to BP network to accomplish the recognition of unfertilized eggs. The experiment results indicate that the area feature of egg's vertical image contains more category information, and this kind of feature classified by BP network can reach 97.86% of recognition rate. Moreover, it is almost free from some external factors, such as light, camera, eggshell and the parameters of BP network. While the other features sent to BP network, the recognition rate can be reached to only 86.43%. This study provides an effective and useful method to recognize unfertilized egg in early incubation stage.

Abstract: Due to the proactive defend against the worm propagation and patch the susceptible hosts, benign worms are attracting wide attentions in the worm research. In this paper, we put forward a revised benign worm-anti-worm propagation model to achieve effective containment of worms.

Abstract: With the advance of science and medicine, life expectancy of human beings becomes increasingly higher. Never the less, human bones and joints very often could be impaired and cause pain due to degeneration, osteoporosis, and long-term use. With the advance in science and medical engineering, artificial joint replacement can greatly relieve pain and improve the functionality of the joint in cases of severe joint diseases. X-ray Computed Tomography (abbreviated CT) is a medical imaging test that employs x-ray to penetrate human body and x-ray sensors positioned at the opposite side of the body to receive the x-ray. The x-ray images are then processed by computer to create tomography, but errors in measuring accuracy none the less could cause distortion to the computed tomography. Previous concept of designing artificial joint component has been existent in simulated situation, and there are many insurmountable technical difficulties in the practice of reconstruction which results in design flaw in the geometric shape of artificial joint body and increases the risk of failure. This study uses empirical method to determine the shape and size that is closest to human bone, and aims to achieve accuracy error compensation by means of correction mode and consequently improve the accuracy of reconstructed artificial joint and lower the risk of failure in artificial joint arthroplasty.