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Currently OGC GML (Geography Markup Language) specification has been the in fact standard of GIS data sharing and exchanging, and spatial interoperation. Adopting nested association expression approach of XML data, GML data documents store both spatial information and semantic relationship information of geographical elements. In order to improve the efficient of path query on GML two type information,...
An improved color image enhancement algorithm based on MSR was proposed in this paper. The appropriate wavelet bases were selected to decompose the input image into three levels. Then different enhancement algorithms were employed to process the decomposed wavelet coefficients and scale coefficients. For the wavelet coefficients, after the analyzing of each level??s characters, a modified adaptive...
As the band of networks increases, the process speed of network-based intrusion detection system (NIDS) hardly keeps up with the speed of networks. By arranging several sensors to deal with the traffic in parallel, the intrusion detection system's speed can be significantly increased. How to split the traffic to the sensors is the key problem of a parallel intrusion detection system. To resolve the...
Wireless sensor networks (WSNs) consists of unattended sensors with limited storage, energy (battery power) and computation and communication capabilities. Since battery power is the most crucial resource for sensor nodes, the utility of energy efficient and the maximum lifetime is special important. In this paper, we present an energy-efficient dynamic clustering algorithm(EE-DCA)for wireless sensor...
With the advent of the grid, task scheduling in heterogeneous environments becomes more and more important. The model of grid scheduling is analyzed in this paper. The optimal objective is to minimize the total completing time. This paper presents an improved particle swarm optimization (PSO) algorithm with discrete coding rule for grid scheduling problem. The improved PSO algorithm can keep all the...
Concept lattice was creatively used in mining correlated policy rules in this study. It takes much time for a conflict detection routine to search every policy in policy repository with conventional policy storage models to see if conflict occurs before a new dynamic policy is added to the policy repository. A novel storage model for dynamic policies was proposed to address this problem. Dynamic policies...
Human objects segmentation is one of key problems of visual analysis. In this paper, a novel touched human objects segmentation based on mean shift algorithm is proposed. At first, video images is preprocessed and foreground objects (BLOB) is obtained, model of human object is built according to statistical characteristics of body surface. Then, a few of points picked equally from BLOB is taken as...
On the basis of the definition of WHRT (weakly hard real-time), this paper summarizes the constraint qualifications of the existing WHRT and scheduling algorithms, places emphasis on the discussion of DBP algorithm and E-DBP algorithm, proposes two concepts according to the deficiencies of the two algorithms, namely total distance of entering invalidation and total distance of aborting invalidation,...
Ethernet passive optical network (EPON) is thought of as the best candidate for the next-generation access network, much attention has being put on assessing and bringing up better bandwidth allocation algorithm. This paper analyses the performance of the existing algorithms and brings forward an improved algorithm basing on the basis of the existing algorithm, which has made the improvement to the...
In this paper, we consider the problem of resource allocation (in terms of subcarrier, bit and corresponding power) for downlink transmission in multiuser OFDM system. An improved subcarrier and power allocation algorithm is proposed, which uses two steps to allocate recourses dynamically. Given the system??s total power and BER, this algorithm tends to maximize the bit rate to make effective use...
A novel algorithm of three-layer probability model based on synchronous detection lines is proposed to solve the problems of background updating and target tracking. Firstly, the state of each pixel point on the same synchronous detection line is judged in the probability model of pixel points. Secondly, the state of each synchronous detection line is estimated by maximum likelihood estimation so...
In embedded system, how to utilize the limited physical storage capacity for code parameters is a challenging problem. This paper proposes a dynamic programming based algorithm to solve this problem under DOCSIS standard. The algorithm is able to generate the best storage structure of parameters in terms of the width of the bus, the priority and least storage spaces of those parameters. The algorithm...
Wireless sensor networks (WSN) have recently emerged as a hot research topic. One of the most important concerns for WSN is energy. To obtain long lifetime, one potential method is to use clustering algorithm. Moreover, WSN should meet various requirements for quality of service (QoS). Accordingly, this paper presents an energy-aware QoS routing algorithm for WSN, which can also run efficiently with...
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