Applied Mechanics and Materials Vols. 738-739

Abstract: To tackle such problems as low security, inefficiency and high cost in traditional data transmission between different security domains, this paper discussed the basic design decisions that form the first step one should consider, especially for creating a design with the advantage of high-efficiency and low-cost optical devices. It first explored the design issues of software and hardware systems with the application of various network separation systems. It then described the reliability features with regard to error detection and data integration, and the mechanism of the newly defined protocol structure. At last, it outlined the key design points for the system implement and measurement.

Abstract: The architecture of distributed satellite cluster network (DSCN) is presented and the characteristics of DSCN topology change are illustrated. On the basis of analyzing the acquisition method of network status and route calculation, we proposed a heuristic algorithm Ant Colony Optimization (ACO) based traffic classified routing (ATCR) algorithm for DSCN. Simulation results shows that, ATCR algorithm can balance network traffic effectively, and the end-to-end delay of every traffic class is less than TCD algorithm. The end-to-end delay of traffic class A and class B is less than ACO algorithm which does not use traffic classification. ATCR has a better performance on packet delivery ratio than ACO and TCD because ATCR reduces the number of heavy load link as well as packet loss caused by congestion.

Abstract: Considering the changes of MP2P topology due to the limitation of the capability, the unreliable and the churn of the node, the paper proposes a efficiency and safety resource node selection strategy based on Altruism and Bayesian Game in MP2P network. Firstly, obtaining the resource node altruism degree from the value of the contribution and profit of the node . Secondly, adopting the static Bayesian Game theory to connect the resource nodes, the strategy can increase the downloading resources quantity and enhance the ratio of successful request.

Abstract: With the development of network technology and network size, network security incidents occur more frequently. Exploring the reasons and processes that cause network security incidents can help us analyze the current network situation and formulate appropriate coping strategies. In order to find the causes we apply data farming in the filed of network security, a data farming platform based on simulation software NetLogo and data farming tool OldmcData was established in this paper. By planting data in the area of interest, data mining, visualization and such analytical methods can be applied to find out the reasons and processes behind in the incidents so as to take corresponding measure to improve the security of network.

Abstract: This paper studies the basic features and functions of STCP. The traditional TCP protocol and the basic standard SCTP protocols are simulated respectively. We analysis that when the host has multiple network addresses and there are multiple paths between ends, how do the STCP protocol and TCP protocol perform. For practical implementation, using CWND size parameters show performance of multi path transmission in practice, and compare with the ideal case. The results of the simulation and analysis of multi path transmission under the SCTP agreement have practical significance in the future network with multi path transmission.

Abstract: A new transceiving protocol is designed for an FSO communication system, and it’s discussed from the transmitting protocol and the receiving protocol. Different from wired communication, a FSO system modulates the data on a narrow beam of laser transmitting through the free space or the atmosphere, and the protocol is optimized for terrestrial FSO links. Due to the complex composition and activity of the atmosphere, this signal channel brings in great influence on the transmitting laser in it. The function of the receiving protocol includes filtering and synchronizing the input serial data stream, paralleling the serial data stream, decoding the input data, error checking, and exception handling and interfacing the outer receiver with a parallel port. The transceiving protocol could be programmed into a single FPGA chip to improve system integrity and reduce the system cost. We also test the hardware platform and communication protocol and give the waveform. The experiment and Simulation prove that the protocol presented can work well at a certain bit rate scale.

Abstract: The main board of an Android smart-phone is one of the most important payload on PhoneSat. A modified Arduino board, which is based on AOA protocol, is used to connect the main board and the other boards. As there is no screen on the main board, there should not be any touch-screen operations in the communication between the Arduino board and the main board. In this paper, the mechanism of communication and management on PhoneSat is introduced firstly. Then a way to bypass the touch-screen operations in the communication between the main board and the Arduino board is shown. Finally an example about how to realize these two boards sending messages to each other is presented.

Abstract: Since 1980's, all the developed countries have built up national computer network of education and scientific network, which have been the most important infrastructure of education and scientific research in these countries and facilitate their development. China began to invest in building Cernet (China Education and Research Network) since 1994.Many colleges and universities have set up their own campus network. Liaocheng University set up their own campus network in 1997. In order to ensure high availability, high stability and high security of campus network, network information center staff conducted a lot of practice to explore, finally we find some way for Liaocheng University.

Abstract: In order to further improve the performance of node positioning system and intrusion tolerance in Wireless Sensor Network (WSN), taking advantage of the redundant information within multi-hop sensor networks, a secure location algorithm which based on node hops, consistence aggregation and gradient descent (HCAGD) was put forward in this paper. In which the ideology of Hop-based node positioning algorithm was used for getting reference positioning information; the gradient descent algorithm was used for position estimation.

Abstract: With the arrival of the wave of information technology, the business activities of a variety of business systems via the network to complete. But the virus to exploit system vulnerabilities to sneak into the enterprise information network server, the enterprise network into a leak and suffered the double threat of external hackers. Leverage existing security infrastructure, enterprise networks, statistical analysis of all possible virus invasion point, combined with a good virus defense technology layers protection system vulnerabilities, the formation of a whole network antivirus, coordinated operations, a unified management modernization virus defense systems.