Applied Mechanics and Materials Vol. 577

Abstract: With cloud computing systems becoming popular, it has been a hotspot to design a scalable, highly available and cost-effective data platform. This paper proposed such a data platform using MySQL DBMS blocks. For scalability, a three-level (system, super-cluster, cluster) architecture is applied, making it scalable to thousands of applications. For availability, we use asynchronous replication across geographically dispersed super clusters to provide disaster recovery, synchronous replication within a cluster to perform failure recovery and hot standby or even process pair mechanism for controllers to enhance fault tolerance. For resource utility, we design a novel load balancing strategy by exploiting the key property that the throughput requirement of web applications is flucatuated in a time period. Experiments with NLPIR dataset indicate that the system can scale to a large number of web applications and make good use of resources provided.

Abstract: The Real-time system estimates the worst-case execution time (WCET) of the program to ensure the real-time requirements of the system. In this paper, a test method based on Associative Process Communication (APC) is put forward. First it tests the WCET value of basic blocks of ICFG through the use of APC algorithm, and then estimates the WCET by analyzing the worst execution path of the basic block. APC test method tests all benchmarks of Mälardalen. And the test results show that the proposed test method is precise and effective, and the test error is within the theoretical analysis.

Abstract: This paper presents a data fusion method on wireless sensor network based on radial basis function neural networks. In consideration of the hierarchical relationship topology wireless sensor networks, data acquisition, handling and delivery, we proposed a typical classification approach based on radial basis function neural networks. Optimization strategy adopted to process node data for each node indicated different reaction related with energy consumption. Simulation results verify that the method converges fast and effectively.

Abstract: In a Mobile Ad-Hoc Network (MANET), the optimal placement and movement of relay UAVs and the performance of the relay network are all closely related to the propagation and coverage area of the relay signals. In this paper, on the basis of the geometric model of the relay link and relay signal coverage area, synthetically considering the impact of the propagation path loss, the multipath fading and the shadow fading, we study the coverage area of the relay signals by applying a statistical model based on the coverage of outage probability. The simulation results show that the channel fading has big effects on the radius of coverage area, and the radius of coverage area will increase rapidly with the increase of the outage probability. The results provides valuable recommendations for the placement, the movement strategy and network performance evaluation in the MANET.

Abstract: The design of broadband access network is a key link in the construction of intelligent community. DSL, FTTx, WLAN and WiMax are the most common kinds of broadband access technologies. In this article, we provide the basis for solving the broadband access problem through the comparative analysis on the advantages and disadvantages of those technologies.

Abstract: The paper targets at vocational colleges with weak information technology infrastructure, analyzes their traditional cost structure, utilization and cost utility of IT resources, discusses the cost analysis model of public cloud if accessible, and explores appropriate IT strategies for rapid development based on actual cases.

Abstract: Healthcare scenarios are human-machine systems which involve diverse linked products. Based on analysis of key elements of healthcare scenario under overall digitalization, the paper proposes a new definition of modern healthcare scenario from a system perspective and summarizes three dimensions of interactive relations in modern healthcare scenarios. According to data from field interview and case study, the paper thoroughly discusses forms and implementations of the interactive relations in healthcare scenarios from three aspects, i.e. information interaction, human-machine interaction and space interaction. We think the in-depth study of interactive relations in modern healthcare scenario can aid in the requirement elicitation process of medical product design and intra-hospital communication technology development.

Abstract: In this paper, based on QoS Policy of current DDS, a similarity-matching function of QoS Policy combinations is designed between the publishers and the subscribers, and corresponding flow is also designed to match those QoS Policy combinations.

Abstract: The wire transmissions are commonly used in traditional industrial transmitters, but it has the problems like wiring complexity and inconvenience of installation. The design of zigbee wireless transmitter based on C8051F350 is proposed in this paper, which introduced hardware and software, meanwhile, plenty of experiments have been put forward to test it. The result of these experiments shows that it has the features of low power consumption, flexible networking and scalability. This design solves the problem of field wiring, and it has the advantages of lower cost, easy field-installation and operability.

Abstract: Gossip algorithms which belong to a kind of distributed algorithms can be used to compute the (possibly weighted) average of the initial measurements of the nodes at every node in the network. This paper proposes an improved broadcast gossip algorithm to estimate average energy with better accuracy. In this proposed algorithm, we use some companion variables to save the sum, and convergence error is decreasing with the number of companion variables increasing. Convergence of the proposed algorithm is studied theoretically and verified by simulations. Although the estimated value is random, we show that the novel algorithm can converge closer to average than broadcast gossip algorithm in probability.