Advanced Materials Research Vols. 403-408

Abstract: With the development of E-Business, supply chain management of manufacturing enterprises becomes more efficient, making business transactions more simplified, and meanwhile, organizational structure is transformed into open flat network structure from a pyramid hierarchical structure. Therefore, it is essential that manufacturing enterprises view as a whole function processes various businesses inside the enterprises and between the nodes at the supply chain, comprehensively improve the level of human capital through the form of virtual enterprises and establish management teams with the innovation consciousness.

Abstract: A wireless detection and remote management system is designed to solve the problem of Real-Time wireless detection of thermal defects of high voltage equipment. This system uses a new method that continuous power of CC2530, a ZigBee wireless single chip, is provided by using monocrystalline silicon solar cells and thermoelectric generation modules. This method can also solve the problem that overheat faults cannot be alarmed timely when efficiency of solar cells decrease during the continuous rainy days, and can realize Real-Time wireless detection and remote fault analysis of thermal defects of high voltage equipment. The supervisory programs of the remote PC and the upper computer are designed through VC + +.NET and the communication mode adopts C/S model based on TCP/IP protocols. The image files are saved as JPEG format by CImage class, which implements the real-time transmission of images. All of these provide a technical assurance to the remote and intelligent control of heat vice of high-voltage equipment in multi-stations.

Abstract: Simulation environment of the mobile Ad Hoc network is built by applying NS2 simulation software. The simulation data indicates that AODV routing protocol is better than DSDV in throughput, fairness and stability. In the underwater network environment where the nodes are in Low-Speed movement, the data transfer rate of AODV routing protocol is higher than AOMDV. To a certain extent, AODV is more suitable for application in underwater environments.

Abstract: In this paper classic static and dynamic scheduling strategy is analyzed first, and then communication network of schedule ability judgment basis is given. An improved dynamic EDF scheduling algorithm is proposed in order to improve the scheduling task of real-time. The scheduling strategy is to change task priority according to the transmission error over deadline task when applying dynamic EDF scheduling strategy. True Time tool is used to build CAN network control system simulation platform. Dynamic EDF scheduling algorithm and improved scheduling algorithm are simulated respectively. The effectiveness of improved scheduling algorithm is verified by the simulation Keywords-Network control system; Scheduling Algorithm; True Time toolbox result.

Abstract: For the inherent deficiencies of fieldbus control system, the thesis is designed and implemented a kind of embedded network controller with AT91RM9200 which is a 32bits microprocessor, multiple Ethernet interfaces and field bus interface for embedded network controller, the establishment of a Windows CE-based embedded software development platform. Embedded Network Controller to the CNC system, CAN bus and DSP by matching the system to improve timeliness and reliability, a remote distributed measurement and control and communication purposes.

Abstract: After analyzing noise and disturbance in FBG temperature sensing network, three different kinds of statistical methods are processed in experiment as pretreatment to deal with inaccuracy of data fusion results caused by outliers. After replacing outliers with statistical estimated value of three methods respectively, weight minimum mean square error (WMMSE) algorithm is operated to fuse majorized data. Pretreatment makes full use of sensors’ data, meanwhile, accuracy and robustness of measurement system are enhanced. Variances of the fusion results indicate that pretreatment can improve fusion results significantly. Fusion variance without pretreatment is 2.9762, larger than mean value method’ variance 1.9525, median method’s 1.3341 and trimmed mean method’s 1.6016.

Abstract: In parallel filesystem, data for a single file is striped across multiple storage nodes to provide high performance. But the synchronous write performance of the small file is always poor because it is low efficiency to strip the data of small file to multiple storage nodes. So, many parallel filesystem use the uniform distribution method to save whole the small file to on storage node. This storage method of small file leads to the performance bottle of small file synchronous write in parallel file system. This paper presents a high performance automatically cooperative synchronous write mechanism for the small file in parallel filesystem: C-SWM. C-SWM is a set of pure software mechanisms which provide the reliability of synchronous write operations with the performance of asynchronous write operations. The data of asynchronous write in C-SWM are saved on both two cooperative nodes in parallel filesystm before being written to disk. The experiments in this paper prove that the C-SWM can great improve the small file synchronous write performance in parallel filesystem.

Abstract: The lower reach of Minjiang River, which passes through the Fuzhou city, is in the tidal area. A Two-Dimensional hydrodynamic and water quality model is developed. Taking Wukong sewage outfall as an example, the characteristic of pollution zone which is visualized by the contour of concentration is investigated, and the influential factors are also analyzed. It shows that the longest upstream pollution zone appears near the fastest flood moment, the longest downstream one appears near the ebb moment, the widest pollution zone occurs near the high or low water stand moment. The factors such as pollutant load, pollutant decaying coefficient and longitudinal diffusion coefficient are sensitive to the range of the pollution zone.

Abstract: According to the theory of simple linear regression model, this paper designed a lossless sensor data compression algorithm based on one-dimensional linear regression model. The algorithm computes the linear fitting values of sensor data’s differences and fitting residuals, which are input to a normal distribution entropy encoder to perform compression. Compared with two typical lossless compression algorithms, the proposed algorithm indicated better compression ratios.

Abstract: Based on the analysis of the characteristics of OD data, method of cluster analysis has been used to extract the morphological characteristic of travel demand. According to the positions of distribution points for passenger, the position and direction of traffic corridor have been finally determined. This method has been used in Nanning city and the result shows that this method could provide reference to urban public transit planning.