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Nowadays, the Internet of Things (IoT) is receiving more attention in commercial and academic research, especially about its security property. However, current protocols cannot satisfy the requirement of various IoT applications and introduce some problems. There are three typical problems: traditional public key infrastructure (PKI) apply in IoT will incur great overhead, wireless sensor network...
The replication mechanism of NoSQL database MongoDB includes Master/Slave structure and Replica Set. Write operation implement on Master, Slaves will send the synchronize data command asynchronously to Master to update its data. Read operation just implement on Master to provide the strong consistency, while read operation implement on Slave to provide the eventual consistency. Replica set is a group...
MongoDB is one of the typical NoSQL database. The database mechanisms of MongoDB about document-oriented storage, GridFS for storing files of any size. The data storage structure of MongoDB is given, which uses BSON as the data storage and network transfer format for documents, simple and fast in query and easy in horizontal scalability with low cost.
With the rapid development of the new medium, human society has entered the digital ages, which has a deeply influence on the development of display design. Today, the developmenting trend of display design shows digital, intelligent, humane will be the certain trend of display design. When it comes to display method and display design, it is more diversity. The utilization of digital technique to...
Objective. To identify sociodemographic factors associated with completing a follow‐up survey about health status on the web versus by telephone, and to examine differences in reported health‐related quality of life by method of response.
Data Sources/Study Settings. Survey about child health status of 896 parents of children aged 0–17 years treated in a hospital emergency department or admitted...
Optical-Wireless (FiWi) access network is a newly emerged access network architecture which integrates passive optical networks (PONs) with wireless mesh networks (WMNs) to provide the ubiquitous, low cost, high bandwidth last mile Internet access. Though the PON subnetwork of FiWi network can provide high bandwidth, the interference in the wireless subnetwork still limits the throughput of FiWi network...
Bandwidth-delay-constrained multicast routing problem is an NP-complete problem. In this paper, we propose a QoS multicast routing algorithm based on artificial fish swarm optimization. Meeting with the bandwidth-delay-constrained, the proposed algorithm can search the least-cost multicast routing tree quickly. Simulation results show that this algorithm has high reliability and good performance of...
Hybrid wireless-optical access network (WOAN) is a newly emerged network which integrates passive optical networks (PONs) and wireless mesh neworks(WMNs) to provide the ubiquitous, high bandwidth last mile Internet access. In WOAN, transmission delay for traffic up to the Internet consists of wireless path delay in WMNs and waiting delay at ONUs due to the TDMA schedule. The ONU from which transmission...
In a service overlay network, the services provided by different service providers might span multiple Internet domains. A service provider failure may cause significant performance deterioration. Thus, it is desirable to provide fault tolerant service composition solutions such that the service composition can be switched to the backup service composition solution in case of a service provider failure...
In video transmission over unreliable channels such as wireless channels or the Internet, transmission errors by for example packet loss are inevitable. For low bit-rate video applications, the loss of a packet may result in the loss of a whole video frame. In this paper, we propose a new algorithm to recover the lost frame. The proposed algorithm explores the spatial and temporal correlation among...
This paper attempts to accomplish a novel task of mining competitive information with respect to an entity (such as a company, product, person) from the web. An algorithm called "CoMiner" is proposed, which first extracts a set of comparative candidates of the input entity and then ranks them according to the comparability, and finally extracts the competitive fields. The experimental results...
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