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5th Joint International Conference on Semantic technology, JIST 2015

作者： Xiao, Zhengrong Chen, Fengjiao Xu, Fangfang Gu, Jinguang College of Computer Science and Technology Wuhan University of Science and Technology Wuhan430065 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-Time Industrial System Wuhan430065 China

ISBN: (纸本)9783319316758

With the wide use of RDF data, searching and ranking semantic data with SPARQL has become a research hot-spot. While there is no much research work on top-k join queries optimization in RDF native stores. This paper proposes a new rank-join operator algorithm ERA-RJN on the basis of SPARQL-RANK algebra, making use of the advantage of random access availability in RDF native storage. This paper implements the ERA-RJN operator on the ARQ-RANK platform, and performs experiments, verifies the high efficiency of ERA-RJN algorithm dealing with SPARQL top-k join query in RDF native storage. © Springer International Publishing Switzerland 2016.

关键词： Database systems

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DEM generation using bistatic interferometry:high-coherence pixel selection and residual reference phase compensation

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Science China(information Sciences) 2015年第6期58卷 25-38页

作者： ZENG Tao ZHU Mao HU Cheng TIAN WeiMing ANTONIOU Michail Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology School of Electronic Electrical and Systems Engineering University of Birmingham

The bistatic spaceborne/stationary In SAR configuration could be applied to generate digital elevation model(DEM). However, two factors limit the DEM precision improvement. On one hand, due to the effects of the illuminator’s sidelobe and the high objects’ shadow, the pixels in the corresponding area might be polluted by the noise. On the other hand, owing to the presence of deviation(between the real value and the nominal value of the master/slave antenna positions), after utilizing the nominal value to compensate for the reference phase, the residual reference phase would remain. In order to solve the problems, we proposed a new bistatic DEM generation algorithm. Firstly, we applied the coherence-phase joint analysis method to select high-coherence points. Secondly, we deduced the transforming relationship from the deviation to the residual reference phase, and then compensated for the residual reference phase. In the experiment, the Yao Gan-3(an L-band spaceborne SAR) was selected as the transmitter and the two stationary receivers were mounted on the top of a tall building. The algorithm recommended in this paper was applied to process the measured bistatic data. The analysis of the results demonstrated that the elevation error of the generated DEM for some targets had been limited to the level of 1–2 m.

关键词： bistatic In SAR high coherence pixel DEM SAR bistatic SAR

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Saliency detection model for low contrast images based on amplitude spectrum analysis and superpixel segmentation 11th

Saliency detection model for low contrast images based on am...

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11th International Conference on Bio-inspired Computing – Theories and Applications, BIC-TA 2016

作者： Yang, Hua Xu, Xin Mu, Nan School of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Hubei Province Key Laboratory of Intelligent Information Processing and Real-Time Industrial System Wuhan University of Science and Technology Wuhan China

ISBN: (纸本)9789811036132

Traditional saliency detection models face great challenges towards low contrast images with low signal-to-noise ratio property. In this circumstance, it is difficult to extract effective visual features to describe salient information in image. This paper proposes a saliency detection model for low contrast images utilizing efficient features both from frequency domain and spatial domain. The input image is firstly transformed into frequency domain to calculate the amplitude spectrum by a median filter, aiming to suppress the information from non-salient regions. Then, a superpixel based feature extraction method is utilized to generate saliency map via both local and global spatial information. Experiments are carried on the low contrast image dataset to demonstrate the effectiveness of the proposed saliency detection model over other eight state-of-the-art saliency models. © Springer Nature Singapore Pte Ltd. 2016.

关键词： Median filters

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SAR geometric correction algorithm improvement on multi-core C6678 DSPs

SAR geometric correction algorithm improvement on multi-core...

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Mengyu Lu Jinghua Wang Jin Ye Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing China Department of Overall Design China Academy of Space Technology Beijing China

This paper achieves the SAR geometric correction algorithm and makes improvements based on multi-core C6678 DSPs. To solve the insufficient real-time problem, this paper improves the geometric correction, and designs process software that can meet the real-time requirements, from the process flow, process algorithm and storage process aspects. This paper describes the multiple DPSs parallel process scheme and multi-core mapping tasks, and makes a comparison of the time-consuming before optimization and after. And after the optimization, the geometric correction's efficiency is two times of the original. After verification, the parallel process software designed in this paper can meet the real-time requirements of the project, and also has good stability.

关键词： Digital signal processing Algorithm design and analysis Azimuth real-time systems Quantization (signal) Synthetic aperture radar Optimization

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A novel threshold template algorithm for ship detection in high-resolution SAR images

A novel threshold template algorithm for ship detection in h...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Chonglei Wang Funkun Bi Liang Chen Jing Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China School of Electronic Information Engineering North China University of Technology Beijing China

A new threshold template algorithm is presented in this paper to improve the performance in ship detection in high-resolution synthetic aperture radar (SAR) images. The algorithm introduces SAR formation theories into detection. First, we divide the image into tiles within which the sea background can be treated as homogeneous one. Second, we use a threshold template method to detect candidate ship pixels in each tile. The data model and point spread function model together decide the parameters of the template. Third, group candidate pixels together and exclude false alarms. The template method exploits the relationship between neighbor pixels, which characterise high-resolution images. Experiments validate the algorithm with good performance.

关键词： Synthetic aperture radar Detectors Marine vehicles Image resolution Algorithm design and analysis Object detection

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Corrections to “Performance Analysis of L-Band Geosynchronous SAR Imaging in the Presence of Ionospheric Scintillation” [Jan 17 159-172]

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IEEE Transactions on Geoscience and Remote Sensing 2017年第1期55卷 615-615页

作者： Cheng Hu Yuanhao Li Xichao Dong Rui Wang Dongyang Ao Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China School of Information and Electronics Beijing Institute of Technology Beijing China Department of Electronic Engineering Tsinghua University Beijing China

In the above paper [1] there are errors in several places: 1) the first lines of text at the top left of page 3; 2) equations (2) , (11), (12), (13) , and (15) ; and 3) Fig. 3 . Their correct forms are presented... 详细信息

关键词： L-band Synthetic aperture radar Ionosphere Low earth orbit satellites Image analysis

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Nucleic acid secondary structures prediction with planar Pseudoknots using genetic algorithm 11th

Nucleic acid secondary structures prediction with planar Pse...

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11th International Conference on Bio-inspired Computing – Theories and Applications, BIC-TA 2016

作者： Kai, Zhang Shangyi, Li Juanjuan, He Yunyun, Niu School of Computer Science Wuhan University of Science and Technology Wuhan430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan430081 China School of Information Engineering China University of Geosciences Beijing100083 China

ISBN: (纸本)9789811036132

Nucleic acid nanotechnology offers many methods to fold into a variety of complex and functional nanostructures. These selfassemble scaffolds are valuable in various applications, such as molecular programming, sensing, drug delivery and nanofabrication. However, existing algorithms are typically lacking on predicting pseudoknots structure fast and accurately. This paper proposes a novel genetic algorithm to predict nucleic acid secondary structure including pseudoknots. The length of continues base pairs stacking and free energy are considered to evaluate individuals. Furthermore, the performance of our algorithm is compared with RNAStructure using PseudoBase benchmark instances, and the results show that our algorithm outperforms on accuracy and efficiency. © Springer Nature Singapore Pte Ltd. 2016.

关键词： Nucleic acids

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A waterborne salient ship detection method on SAR imagery

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Science China(information Sciences) 2015年第8期58卷 193-196页

作者： MA Long CHEN Liang ZHANG XueJing CHEN He Nouman Qadeer SOOMRO Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology College of Information Technology Beijing Union University School of Computer Science Beijing Institute of Technology

Dear editor,Synthetic aperture radar(SAR)is a powerful electro-optic sensor for maritime use regardless of impact of time and meteorological ***,ship detection plays an important role in maritime

关键词： SAR A waterborne salient ship detection method on SAR imagery Figure

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An efficient TOPS imaging algorithm based on spectral analysis

An efficient TOPS imaging algorithm based on spectral analys...

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： XiaoBei Wang Peng Yin ZeGang Ding XueMei Yan Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China CAST Beijing Institute of Spacecraft System Engineering Beijing China

ISBN: (纸本)9781509027095

The Terrain Observation by Progressive Scans (TOPS) mode solves the problems existing in the conventional ScanSAR mode by steering the antenna along the azimuth direction. However, the antenna steering introduces a serious azimuth signal aliasing both in time-domain and frequency-domain, thus traditional imaging algorithms are not available for the TOPS mode. In order to solve the azimuth signal aliasing, an efficient TOPS imaging algorithm based on spectral analysis (SPECAN) is presented in this paper, which is improved by sub-apertures division in the azimuth processing part. Only few FFTs and complex multiplications are used in the whole imaging processing, thus the algorithm has a high efficiency. What's more, in the final focused image, different ranges have the same azimuth interval and the azimuth image resolution is alterable according to the application requirements. Finally, some simulations are conducted to verify the validity of the proposed method.

关键词： Azimuth Algorithm design and analysis Imaging Antennas time-frequency analysis Bandwidth

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A π/4 Compact Polarimetric Model for High-Resolution Radar in Target Recognition

A π/4 Compact Polarimetric Model for High-Resolution Radar ...

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CIE International Conference on Radar

作者： Liang Zhang Suixue Wang Yu Wang Yin Xiang Junfu Wang Yanhua Wang Yang Li Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China Beijing Racobit Electronic Information Technology Co. Ltd. Beijing China

Polarimetric information can fully reflect the electromagnetic scattering characteristics of radar target. Compact polarization, which can reduce the system complexity while preserving the polarimetric information has become an important technique of getting polarimetric information in recent years. In this paper we propose a modified implementation for π/4 compact polarimetric mode radar, where the transmitter polarization is orientated at 45°, and the receivers are at 45° and 135° polarizations. A procedure of reconstructing the full polarimetric information and extracting the features are subsequently deduced. From experimental data, we verify the scheme can distinguish different polarimetric scattering mechanisms. The method shows potential to better reconstruct fully polarimetric data and application value in target recognition.

关键词： polarimetric radar high-resolution radar compact polarization target recognition

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