Advanced Materials Research Vols. 433-440

Abstract: Crosstalk between high speed parallel bus signals is one of the most important signal integrity(SI) issues. In this article, a crosstalk simulation method based on full-wave scattering parameters extraction for transmission lines is researched. First, the coupling mechanism between transmission lines is analyzed using S-Parameter network theory and a fast frequency-domain method for crosstalk calculation is introduced. Then based on this method, some basic rules of crosstalk are studied in details and the method is validated by simulation results which agree well with those of RLGC model. At the end of this paper, a practical crosstalk simulation example between high speed data bus signals on a 8-layered printed circuit board is demonstrated step by step.

Abstract: Expound the report implementation of user-defined management information system (MIS) from the parts of system design, functional modules and system implementation. Meet the requirements that the report in user-defined MIS should be dynamic, flexible and user defined by using technologies of dynamic arrays and DataList in Visual Studio.net.

Abstract: This paper propose a new design of dual-band GPS microstrip antenna by spreading out the patches on the ground plane. With two independent patches, the antenna operates at two frequencies, which are available in different GPS systems. When patches are spread on the ground plane, the beam of radiation pattern shifts away and axial ratio degrades. In this design, two patches are printed on two independent substrates with a compact design, and positions of two antennas are optimized. Finally, above problems are solved with a conductive vaulted base. The design procedure is discussed, and optimized results are presented.

Abstract: In order to improve reliability of running and facility of data acquisition for the pavement accelerated loading testing equipment, simplify wiring and reduce fault rate, the analysis and design of control system and data acquisition system hardware and software for the pressure, speed, load times and otherwise are done. The distributed CAN Bus technique is used for control and data acquisition, which can collect data from many nodes for each parameter. After a number of laboratory and field experiment, the results show that high reliability of system running and precision, anti-interference of data acquisition are improved by the design of control system for pavement accelerated loading testing equipment based on CAN bus technology.

Abstract: Using mixed programming of MATLAB.NET component and C# with the fuzzy C means clustering algorithm in image processing. Create MWArray Interface, full use of C# programming interface of the good and citing MATLAB generated dynamic link library (dll). The image processing operations through the dll into the FCM segmentation function of the MATLAB, and return threshold value. Finally, complete segmentation of gray image. Experimental results show that this method keeps the same segment effect as that the traditional FCM has. Using C # reference MATLAB Program, simple software interface programming, enhanced security, and expanded scope of use.

Abstract: The best method to construct a high quality KD tree is by using Surface Area Heuristic[1][4] (SAH). However, the computation involved in SAH is expensive. Wald and Havran[2] introduced a sequential algorithm of O(NlogN) complexity, which reached the lower bound of constructing a binary tree. In this paper, we will introduce a parallel SAH KD tree construction algorithm based on the O(NlogN) sequential algorithm. We proposed data structure for parallel constructing process which can minimize the communication among working threads, and a load balance strategy for evenly distributing work load. Our algorithm can achieve 4x speed up on 8-core CPUs architecture.

Abstract: E-commerce is a kind of new business model based on Internet. In recent years, with the rapid development of Internet set off an upsurge of E-commerce, but E-commerce security problems become increasingly prominent and become the main factors of affecting development. This paper analyzes the threat from the technical aspects of the current E-commerce security, and discussed some technology to address security problems.

Abstract: Networked Control System is the focus of current research in control field, and the use of a shared network introduces new challenges, therefore, it is significant to research scheduling algorithms for improving the control and schedule performance of NCS. In the paper, according to the challenges existing in scheduling algorithms, a new scheduling algorithm called Switch scheduling is proposed, and the calculation method of switching conditions is also given. In the proposed algorithm, network-induced delay and network utilization are considered to satisfy the different network condition with appropriate scheduling algorithm. The proposed algorithm improves the network utilization and the efficiency of data transmission, and guarantees the system stability. Finally, a simulation example is conducted to validate the feasibility and superiority of the proposed switch scheduling.

Abstract: D.H. Lawrence was an outstanding novelist of Britain in the 20th century. While he inherited the essence of the realism, he also absorbed nutrition from modernism and made some great developments, one of which was symbolism. Lawrence applied it in many of his works skillfully, which gave the novels a taste of mystery and indicated the ending of the stories. His famous novel Sons and Lovers is naturally not an exception, in which the use of symbolism is a typical character. The writer made full use of this method. There are three kinds of symbols in this story: symbolic images implying the emotion of the characters, symbolic characters standing for different kinds of love of the hero and symbolic episodes expressing the characters’ inner thoughts. The novel has attracted so much attention partly due to the perfect application of symbolism.

Abstract: Conventional methods that perform lung segment -ation in CT slices rely on a large contrast in hounsfield units between the lung and surrounding tissues. However, the lung fields are affected by high density pathologies, and they are discontinuities in the pixel intensities, the traditional segment- ation methods can’t get the good results. Here, we present a new segmentation method of the active contour, which is constraining with respect to a set of fixed reference shapes of lung fields. This approach is based on the shapes descriptors by the legendre moments computed from the shape regions, and it can be used in some complex lung field segmentation, especially suitable for the segmentation of lung field with the juxta-pleural pulmonary nodules. Experiments illustrate that the proposed method is able to segment the lung fields in the CT images successfully.