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Nowadays, with rapid development of technology, Internet, mobile Internet, Internet of things and sensor network, cyberspace has expanded to a ubiquitous space of human beings, machines and Internet of things. The location of people is one of the most important feature in the Internet of things (IOTs). Therefore, we focus on identifying individuals behaviors based on their GPS trajectories to support...
In recent years, a lot of image encryption schemes based on chaotic systems have been extensively investigated to meet the increasing demand for real-time secure image transmission. In this paper, tent maps and swapping based confusion approach were applied to design an image encryption scheme so as to enhance the security and efficiency of chaos-based image cryptosystems. The security and performance...
Anomaly target detection of hyperspectral image has become a hot in remote sensing research field, the paper is studied on the popular sparse representation method of anomaly target detection, and which are compared with traditional algorithm, such as the generalized likelihood ratio detection KRX and RX algorithm. The results show very good detection performance for sparse representation method of...
Despite the popularity of parallel computing and the existence of distributed computing for several years, Grid computing, has adopted the ongoing demand for new and better ways to compute. In computational Grids, managing users' jobs and assigning them to appropriate resources become the first and foremost activities. In order to efficiently execute users' jobs and utilize the distributed resources...
Topology control is one of the key technologies in ad hoc network. Recently some topology control algorithms focus on reducing the end-to-end delay have been proposed. However, they do not consider the delay which is caused by contending for the shared channel and collision at MAC layer. In this paper, we put forward a new delay model to character the link delay which is composed by the transmission...
Mobile communication system is the most widely used wireless communication system, the electromagnetic spectrum environment increasingly complex today, network optimization as a constraint to the performance of mobile communication systems an essential factor. Rational allocation of mobile communication system network optimization resources due to lower operating costs and improve business efficiency,...
The emerging software defined networking (SDN) provides a new paradigm of network management by separating control functionalities from underlying data forwarding hardware to an external controller. SDN provides high flexibility to control the whole network in a unified way. In this paper, we are motivated to study the performance issues of a software defined WiFi network testbed. This testbed consists...
In this paper we propose a compressive channel estimation for fast fading channel in orthogonal frequency division multiplexing (OFDM) systems. We formulate the sparse compressive sensing (CS) problem by exploiting the delay-Doppler sparse structure of the doubly dispersive channel. To combat the severe inter-carrier interference (ICI) caused by the Doppler shift, this estimator is based on the banded...
In this paper, we analysis the three communication systems, orthogonal frequency division multiplexing (OFDM) system, single carrier modulation (SCM) system and hybrid carrier modulation (HCM) system under doubly selective (DS) channels. The implement structures of three systems have been derived. We then explore the property of SCM and OFDM systems. Furthermore, we, through numerical simulations,...
Analyze the multi-resolution modeling characteristics of the command and control system in two modes, the simulation level mode and simulation model mode. Propose the top-down decomposition method of command and control model system, Build a multi-resolution model framework based on components technology. The simulation experiments show that this method can build simulation system flexibly and quickly,...
With the rapid development of wood manufacturing industry, it's call for higher demand for detection of slab's three-dimensional size. The research and innovation of high speed testing theory of machine vision provides an opportunity for the development of wood industry. Machine vision calculates the parameters of acquired images through understanding and judgment, which has been applied to industrial...
An intelligent receiver based on Radial Basis Function neural network (RBF) for Space-Time Block Coded MIMO system is developed here. Due to their fast maximum-likelihood(ML) decoding, STBC are commonly used in MIMO-OFDM system. However, most of the existing STBC methods rely on the availability of accurate channel state information (CSI) at the receiver. Furthermore, many STBC assume the channels...
With the development of the technology, internet of things come into people's life gradually which compose the communication of the things based on the internet of computer. Wireless networking technology also makes great progress. This design, with the features of wireless, long-distance working, high-speed transporting, seamless integration with the wired network, completes long-distance intelligence...
Quality, stability and unity are the basic requirement for product in modern food industry, which can be guaranteed by proper device, such as electronic nose. So an electronic nose is developed to meet the job, the electronic nose has the ability of working independently or interactively with PC. And it is working under Linux 3.0.1 environment, with fundamental functions to working on ARM or PC. It...
The hype over cloud computing cannot go unnoticed even as providers and users alike testify of the evident benefits. It also goes without saying that this approach to computing shares its own challenges the most echoed being security. Security concerns herein, birthed by the exposure of the cloud to different threats, continue to cast doubts on potential users and it's only befitting that such concerns...
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