Advanced Materials Research Vols. 765-767

Abstract: This paper presents an algorithm to develop a path planning applied for the rapid prototyping. Filling the layer region completely is the key to product accuracy of the part ,which is depending on path planning. It can improve the effective of the scanning speed during prototyping. It divides three steps. First of all, it uses the zigzag technology to plan the scanning path, then links the different path on the same layer based on kd-tree technology and links pathes on the different layer at last. In order to diminish the deformation and shrinkage during the process prototyping, it uses the reversed orientation in the different layer. The correctness of the algorithm is verified by experiment. Compared with the rest algorithm , it is more rapid and accurate.

Abstract: A blind watermarking algorithm for 2D CAD drawings based on singular value decomposition (SVD) is presented. In this paper, the handles of lines are sorted to rule out additional entities and relative vertex coordinates are divided into small matrixes for larger watermark capacity. Then, quantization modulation is used to embed watermark so it can be extracted without original drawings. The experiments show that the proposed algorithm has good invisibility, larger watermark capacity and is also robustness to various geometric and entity addition attacks.

Abstract: In this paper, extract the coordinates of the vertices of the 2D CAD graphics to construct the complex-valued signal. And use the signal to do the DFT. The encrypted watermark is embedded into the DFT amplitude by using the IDE algorithm. Experimental results show that the algorithm has good invisibility, with good reversibility. The algorithm has robust against the attacks such as combination of translation, rotation, translation and adding an entity.

Abstract: Firstly, it was studied about how to build three dimensional digital earth with Open Scene Graph (OSG) technology. Then the methods and steps of drawing three dimensional flight route of an aircraft and making an aircraft fly along flight route planed in the digital earth with OSG were studied and put forward. Finally software was written in VC++ based on the methods and steps given in this paper. The running results of the software show that it is very convenient to make flight route of an aircraft visualize with OSG technology, and it is very useful to improve efficiency to plan flight route of an aircraft.

Abstract: As the manager of the data stored in the disk, the security of the file system is an important aspect of the operating system. Given the high logicalness and unambiguousness of the formal methods, also the module independence of the micro-kernel, this paper abstracts a formal model from the file system implementation based on micro-kernel, and then gives the axiomatic semantics of the initialization; finally, gives the correctness assertions of file system initialization, then verify the correctness of the formal model of file system aided with Isabelle/HOL.

Abstract: As the development of synergistic technology application into educational fields, synergistic learning and synergistic working have been hot spots. The article discussed the Synergistic technology. It adopted the concept on Resources Constructing Based on Synergistic Technology, and analyzed the standpoint of resources characteristic and the need of resources construction. The platform of Resources Construction Based on Virtual Synergistic Technology designed is made up of resources constructing, managing and applying. And the resources construction system contains the team of construction, distance synergism & control and constructional pool.

Abstract: Facing the fact that industrial land has a large fraction of state-owned construction land, and the critical problem of the inefficient use of industrial land, it is of great realistic meaning to establish 3D Industrial Land Information System as an auxiliary tool for decision-makers to improve the level of economized and intensive land utilization. In this paper, DOM and DEM of Jintan County were used as background data to generate current 2D industrial land use data; combining with the data of building height, a 3D model was implemented dynamically through the Stamp 3D platform. In this system, land parcels were analyzed through factors like floor area ratio (FAR) and building density, and comprehensive information of land parcels could also be manifested in 3D scenes, thus help decision-makers to dispose the low-efficient industrial land.

Abstract: In view of the current financial, securities, insurance and other industries data information management situation, need to use cloud computing technology on data storage management, enhance the data information access ability, through the application of cloud computation technology research, can improve the financial industry data mining capabilities. The specific implementation process to adopt open source framework is a shortcut. However, reference and use open source framework needs to be combined with their actual needs, through the analysis of the characteristics of Hadoop. The HDFS as Hadoop research foundation, the HDFS features are applied to the practical project, the establishment of HDFS fully supports the relational data model, data mining capacity upgrade.

Abstract: Sequential control using ladder logic, Programmable Logic Controllers (PLCs), and operator interfaces are commonly used in the manufacturing industry today. The introduction course of programmable logic controller is a course that needs a lot of practice. We present a project-based approach to teaching it by introducing real engineering projects into the process of theory teaching. The students show more enthusiastic during learning course and their abilities of solving engineering problems are greatly enhanced.

Abstract: Computer Control Systems course is a key course for undergraduates majored in Automation in Southwest University of China. Some problems exist in the teaching process. Problems were listed and analyzed in detail. To solve problems and improve teaching quality, traditional teaching was reformed and new methods were introduced for course teaching. These methods were put into practice in the teaching process. The result shows that the teaching reform of the course helps to solve some problems; undergraduates devote into learning more than before; and the operation ability and innovation consciousness of the students are improving.