This paper proposes a method for classification of incomplete data using neural network ensembles. In the method, the incomplete data set is analyzed and projected into a group of complete data subsets that give a ful...
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This paper proposes a method for classification of incomplete data using neural network ensembles. In the method, the incomplete data set is analyzed and projected into a group of complete data subsets that give a full description of the known values in the data set by joining together. Those complete data subsets are then used as the training sets for the neural networks. Base classifiers are selected and integrated according to their classification accuracies and the support degrees of their training data sets to give the final predication. Compared with other methods dealing with missing data in classification, the proposed method can utilize all the information provided by the incomplete data, maintain maximum consistency of the incomplete data set and avoid the dependency on distribution or model assumptions. Experiments on two UCI datasets showed the superiority of the algorithm to other two typical treatments of missing data in ensemble learning.
In this paper, a modified planar balanced Vivaldi antenna with endfire characteristics near the metal surface is proposed for 6-18 GHz applications. The proposed antenna structure consists of three copper layers, amon...
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In this paper, a modified planar balanced Vivaldi antenna with endfire characteristics near the metal surface is proposed for 6-18 GHz applications. The proposed antenna structure consists of three copper layers, among which two external layers locate on the two outsides of two dielectric substrates, and the central layer is sandwiched by these two dielectric substrates. To further enhance the end-fire radiation characteristic, a number of novel techniques are proposed, including elongation and shaping of the supporting substrate of a conventional balanced antipodal Vivaldi antenna beyond its aperture, using an I-shaped slot loaded radiation patch and cutting a triangle on the edge of three copper layers. Measured and simulated results show that the proposed antenna not only exhibits good impedance bandwidth, but also improves the end-fire performance in the operational frequency of 6-10 GHz and achieves high gain in the end-fire direction, low cross-polarization and high front-to-back (F-to-B) ratio.
In modern wireless communication systems, one of the most promising techniques to improve the communication reliability and rate relies on the use of Multiple Input Multiple Output (MIMO) systems in association with S...
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This paper is concerned with leader-follower synchronization of complex dynamical networks with sampled-data control. By sampling the signal from the leader at some discrete time instants and using a zero-order hold f...
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For the problem of weak target detection under lower signal noise ratio in radar detection system, a key technique is to enhance target echo energy by long time coherent integration. During the integration period, the...
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For the problem of weak target detection under lower signal noise ratio in radar detection system, a key technique is to enhance target echo energy by long time coherent integration. During the integration period, the target echo may occur range migration with integration time increasing. Direct coherent integration will lead to echo energy spread and deteriorate integration effect. A coherent integration algorithm based on short time sliding window is proposed in this paper. Radar signal is formed into a first in first out queue. The queen is continually renewed by the sliding window. The produced queens are coherent integrated at last. Simulation result shows that the proposed algorithm can prevent range migration efficiently and improve coherent integration capability.
The construction method, throughput and related properties about the topology model of emergency communication networks were discussed. Firstly, the topology modeling method was presented by three steps, such as the c...
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The construction method, throughput and related properties about the topology model of emergency communication networks were discussed. Firstly, the topology modeling method was presented by three steps, such as the constructions of backbone network, access network and station network. Then, the capacity of network model was analyzed in conditions of arbitrary networks and random networks. At last, some topology properties were discussed, including the shortest path, node degree, rich club, betweenness centrality, current flow centrality, eccentricity and closeness vitality. The experiment re-sults show that the proposed modeling method is steady and applicable to the emergency communication.
This paper presents a new approach for constructing normal maps that capture high-frequency geometric detail from dense models of arbitrary topology and are applied to the simplified version of the same models generat...
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In this paper, the PO(physical optics) method is used to study the electromagnetic scattering properties of the complex electrically large conduct target. The target is modelled by software 3DS MAX and divided into tr...
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ISBN:
(纸本)9781467317993
In this paper, the PO(physical optics) method is used to study the electromagnetic scattering properties of the complex electrically large conduct target. The target is modelled by software 3DS MAX and divided into triangle plane cells after imported into software FEKO, and then extract the point and plane information. The numerical results are in good agreement with results of FEKO by considering self and mutual shading of the target which illuminating the effectiveness of this method in calculating the complex electrically large conduct target.
The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model ...
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The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model of wind farm, basic operation performance, output forecasting of wind farm, power flow in smart grid including wind farm, balance of voltage and raeactive power, small disturbance stability, transient stability, faults and reliability, etc., in the hope of offering references for the fast development of smart grids absorbing more capacity of wind power.
Spectrum sensing is one of the fundamental problems for cognitive radio. In cognitive radio networks, cognitive radios can cooperatively sense the spectrum to detect the presence of primary users with higher sensitivi...
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