Advanced Materials Research Vols. 605-607

Abstract: Based on analyzing the principle of BP neural network and time sequence characteristics of railway passenger flow, the forecast model of railway short-term passenger flow based on BP neural network was established. This paper mainly researches on fluctuation characteristics and short-time forecast of holiday passenger flow. Through analysis of passenger flow and then be used in passenger flow forecasting in order to guide the transport organization program especially the train plan of extra passenger train. And the result shows the forecast model based on BP neural network has a good effect on railway passenger flow prediction.

Abstract: Visualization of a journal network is to show the topology of journals reference in a graphic way so as to observe their interaction and importance. A reference network was drawn from the force-directed algorithm, and then compared to the degree centrality and betweenness centrality of the network, and analyzed with their compound influencing factor and core index by Pearson correlation coefficients at last. The results show that the force-directed layout algorithm can effectively reflect the referential status and relations of the library and information (LI) journals, and the importance of a journal can be determined from the layout in a visual and direct way.

Abstract: The sensor node is important component part of the Internet Of Things. The sensor node circuit based on SIM20 module was implemented in the paper. The design of the wireless RF circuit and the energy management circuit were described in detail. The reliable link between the sensors and the gate are achieved by the developed product.

Abstract: The main objective of this paper is to design and develop a basis geospatial data management system. It offers database building, conversion, topology check, query statistics, data extraction, cartographic output, analysis and decision-making for massive geospatial data on a range of basic geospatial data management function. The main research includes the design of basis geospatial database, data management system and the key technologies in system development. Geographic information from 2D to 3D is the result of technical progress and demand-driven, 3D modeling and 3D visualization environment-based spatial analysis and query is the future development direction of the geospatial data management system.

Abstract: This paper introduces the principles and functions of network bridge. The bridge is a storage and forwarding device that connects two LANs. It can be used to connect networks with the same or similar system structures, then the networks being connected would have the same logical, linked control procedures. It is a data link layer connection, and it helps achieving communications between different LANs.

Abstract: The rapid upgrading internet has brought to us many shortcuts and conveniences. Simultaneously, the underlying security problems have surfaced. These include unauthorized access, posing as legitimate users and destroyed data integrity, which interferes with the normal operation of the system. In addition, these computer network invasions are characterized by the focused attacking source, flexible attacking strategies and expanded scope of the attacked target. This paper analyzes the existing network security risks and means of invasion from various aspects; the network security defense measures are discussed here.

Abstract: An algorithm of two stages collision detection is presented for moving objectives in virtual scene. Firstly, AABB bounding box was used to test the intersection of interesting objects in coarse detection stage. Then combining space projection with Z-buffer algorithm, the potential intersecting objects in previous step were tested in precision detection stage, thus we can obtain objects collision data information and complete object collision detection. Finally experimental results show that the algorithm is more efficiency than traditional bounding box detection, the improved technology can realize further accurate collision detection.

Abstract: In order to protect the copyright of the multi-media information effectively, this paper research a digital watermark algorithm based on DCT transform in an image. The digital watermark is embedded in the middle-frequency part of the host image to protect the original multi-media information. The simulation result shows that the hiding watermark extracted has good robustness with common signal distortion or geometric distortion and the quality of the watermarked image is guaranteed.

Abstract: Represent a new Weapon-Target Assignment (WTA) model of warship fleet as to the characteristic of the modern naval battle field and the battle modality. This model considers the WTA to a multi-objects optimization problem, and a Fast and Elitist Non-Dominated Sorting Genetic Algorithm (FENSGA) is applied to resolve this model. The FENSGA can reach a set of wide-distributing, robust solution. One running of the FENSGA can reach a multi-Pareto solution, which the commander can select from. A simulation is given to prove the validity of this model and algorithm.

Abstract: Early-warning system of tourism environment carrying capacity (TECC) in scenic spots is a highly complicated nonlinear system. It is very difficult to establish an accuracy mathematical model. Fuzzy inference system adapts to the nonlinear system that doesn’t get an accuracy mathematical model and has uncertain factor. It has strong robustness and adaptability. Index of early-warning system of TECC in scenic spots is established, extracts fuzzy rules based on historical data, and simulates the early-warning system based on fuzzy inference. At last, taking Nandaihe international amusement centre scenic spot as an example proves that the early-warning model designed is feasible and effective.