Applied Mechanics and Materials Vol. 441

Abstract: The application system based on web technology is the one fit in with the internet era. It is our goal through electronics experimentation to use the virtual web instruments system instead of real instruments. The system is based on a virtual instrument and web architecture. The Browser/Server solution mentioned has advantages such as cost savings by updating the hardware configuration circuit and replacing software components to fit the new type and functions of real devices and instruments, decreasing workload in system maintenance, and making a unified deployment. The content described in this paper shows how to design and implement a network experimental system of electronic technology in virtual instruments, and describes its application in electronics practice.

Abstract: The sparse and mobility of nodes in opportunistic networks will cause network topology often fracturing, resulting that a large number of isolated nodes appear in opportunistic networks. These isolated nodes will waste much energy at idle listening stage, so this paper proposes an Efficient Routing algorithm for opportunistic networks based on Asynchronous Sleep Approach-ERASA. ERASA achieves the goal of saving energy by making the isolated nodes enter the low power consumption dormancy state. Then they will be timely awaken when there are other nodes entering into their communication range. Compared with the classical Epidemic routing algorithm, the several aspects performance of ERASA algorithm are improved such as network lifetime.

Abstract: Different node layout density exist in farmland wireless sensor network monitoring, but the existing wireless sensor network topology control algorithm does not take uneven node distribution into consideration. And the node residual energy issue is not considered in the commonly used LMST topology control algorithm either. This paper presents a wireless sensor network hybrid topology control algorithm which considered both the uneven distribution of network nodes and the residual energy issue. Firstly, this algorithm clustering in the high node density areas based on node degree to reduce overall energy consumption. Secondly this algorithm use nodes residual energy based LMST topology control algorithm to achieve energy balance among network nodes. This improved algorithm ultimately achieved the purpose of prolonging the network lifetime.

Abstract: Power consumption is a key point of WSN (Wireless Sensor Network) lifespan. Because of difference among monitoring objects and complex signal channel condition, the power consumption of each node in farmland WSN is uneven, which makes the network performing as multi-level energy heterogeneous. LEACH and its improving algorithms average the power consumption between nodes by clustering and cluster-head switching. But the cluster-head voting brings a lot extra power consumption. To solve this problem, this paper proposes EACHS (Energy Approximation Cluster-Head Selection), an optimized cluster-head selection mechanism that approximates the energy of cluster-head targeting the lowest energy level in the network. When approaching the target, the current cluster-head collects the energy status of all nodes and determines which one becoming the new cluster-head. The simulation results show that, EACHS can balance the network power consumption and reduce most protocol cost, prolong the overall network lifespan.

Abstract: Cloud computing is becoming a mainstream aspect of information technology. How to efficiently manage the cloud resources across multiple cloud domains is critical for providing continuous cloud services. This paper introduces the principle and review recent research progress on cloud service to support network virtualization. It presents a framework of network-Cloud convergence based on data center network and gives a survey on key technologies for realizing cloud center and service; the reliability of cloud applications can be greatly improved.

Abstract: A novel scheme based on detection is proposed for half-duplex two-way relay system in this paper. Multi-input multi-output and network coding technique are applied in the relay. The proposed method employs detection in this system when the relay and two stations receive signal. Theoretical and simulative analyses of the protocol performance under the assumption of a binary symmetric relay channel model are carried out. The zero-forcing detection and maximum likelihood detection are respectively used. The simulation results show that the new scheme facilitates more reliable transmission and higher information transmission rate.

Abstract: With the development of information technology, agriculture data show large amount of data, distributed, heterogeneous characteristics. It is difficult to access and management with the massive data are continuously increasing which affect the large-scale use of agricultural information data. In this paper, the method of compression algorithm is proposed which based on real-time and time space correlation characteristics. All data is divided into several categories by Huffman compression algorithm combines parallel processing cloud platform. Then, the massive agricultural data is compressed and reducing the data storage. Exprienment result show that cloud storage platform with dynamic scalability. Under the same experimental data, the method of this paper has higher compress ratio, and compression consuming less when a larger amount data, compared with the Huffman compress and dictionary-based data compression algorithm.

Abstract: This paper takes the industry chain correlated theories as the instruction, and takes qualitative analysis primarily with quantitative analysis as auxiliary, and it mainly conducts the research from the following three aspects to the Internet of things industry: the composition of the industry chain of the Internet of things, obstacles existed in the industry chain of the Internet of things, and the method to remove barriers existed in the industry chain of the Internet of things. By the above analysis, this paper makes a more completely detailed study on the industry chain of the Internet of things and then makes some recommendations for the development of industry chain and the entire industry of the Internet of things.

Abstract: Network Control System has more aperiodic tasks.If Nodes in the network only using the time triggered task model, the message and task could easily lead to deadline miss or time stamp is too large to produce a long delay. So using the task model of time triggered and event triggered mechanism in this paper is designed, and the embedded operating system be modified to support the mechanism . It has been applied in the simulation environment to prove the effectiveness of the mechanism.

Abstract: In the developing of marine MFHF Radio simulator, we put forward the concept and method of “network multimedia programming”, “user interface-model-controller” designning architecture. After requirement analysis, with the method and idea of this paper ,we developed the MFHF Radio simulator have successfully and implements its data, voice communication functions over computer network.