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With the popularization and development of the IoT(Internet of Things), more and more data needs to be transmitted over the Internet, which leads to the deterioration of network quality. The CDN (Content Distribution Network) technology is an important theoretical model to ensure network QoS (Quality of Service). To improve the QoS, we extend current CDN system to the hierarchical CDN system, that traditional CDN system is just a special case of hierarchical CDN system. In the traditional CDN system and the hierarchical CDN system, by analyzing the bandwidth between subsystems, we found the inter-system bandwidth is the bottleneck that impedes CDN system expansion. To address this problem, a new kind of distributed system architecture is proposed in this paper. This new architecture uses broadcast channels to distribute broadcast type data and still using bidirection uni-cast channels for other type of data, so we call the new architecture as CHCDN (Channel Heterogeneous CDN) in this paper. The new architecture is analyzed and compared with the traditional CDN system architecture and hierarchical CDN system architecture. Moreover, the experimental simulation result has shown that the CHCDN system features better in real-time cache updating and features with higher data transmission efficiency than the hierarchical CDN system, which indicating that the new architecture has great potential for being widely used in distributed computing.

The wireless sensor networks is a new technology for information acquisition and processing, which includes the techniques of sensor, computer, Internet of Things and network. Due to the fragility of wireless sensor networks, the security issue has become a prevalent concern in the wireless communication for Internet of Things. This paper offers a deep insight to the secrecy capacity of wireless sensor network and a calculable threshold of capacity based on the amplify-and-forward (AF) compressed sensing scheme. Moreover, we provide a feasible algorithm based on augmented Lagrange method for source reconstruction for the legitimate nodes and un-authorized nodes. Furthermore, we also discuss the impact of the numbers of active sensor nodes, relay nodes and eavesdropper nodes to the secrecy capacity. Simulation results demonstrate the correctness of the derived secrecy capacity.

With the development of silicon technology, the scalability and complexity of SoC greatly challenge traditional on-chip interconnection, such as on-chip buses. On-chip networks are efficient architectures to solve the problem of onchip transmission. When silicon industry enters deep submicron era, the reliability of on-chip networks are becoming a protruding problem. The paper addresses the issues using asynchronous logic to guarantee the reliability of on-chip networks. An on-chip network architecture is proposed. Based on experimental results, asynchronous logic greatly improves the reliability of on-chip transmission under the conditions of supply voltage change, wire interference,EMI,clock skew and soft error.

Network-faxing service system is integrated with telephone network and Internet .NET Framework is an internal Windows component which supports to build and run nextgeneration applications and XML Web Services. Online payments provide a safe, fast and convenient electronic business environment and on-line financing settlement tools for enterpriser and individual. Network-faxing is a modern communication network technology with the new rise of a network communication mode, this paper discusses how to realize a networkfaxing service system with the .NET Framework, paymentonline technology and voice Fax Card.

This paper base on the application of the Internet of things in the logistics industry as the breakthrough point, to investigate the identification technology, network structure, middleware technology support and so on, which is used in the Internet of things, also to analyze the bottleneck of technology that the Internet of things could meet. At last, summarize the Internet of things’ application in the logistics industry with the intelligent port architecture.

This paper designs and implements a Smart Card Operation System COS which accords with national and industry standards, possesses high security and good compatibility. Firstly, the hardware structure of Smart Card is introduced, then the architecture and work principle of Smart Card COS are explained, and the design and implementation of Smart Card COS is discussed from four function modules such as transmission management, command interpreter, security control and file management. Finally, an application instance - SIM card is given to show the application on Smart Card.