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2017 9th International Conference on Modelling, Identification and Control (ICMIC 2017)

作者： Bo Cheng Huafeng Peng Long Li Jidong Qin the National Key Laboratory of Science and Technology on Blind Signal Processing the National Digital Switching Engineering & Technological R&D Center

The purpose of this paper is to find a more effective way to reconstruct the structure of a *** this paper,the principle of ISAr and In ISAr signal formation and imaging are analyzed by the perspective of analyzing the target linear frequency modulation echo signal and combining with ISAr imaging *** proposed a method of In ISAr scattering point extraction technology based on CLEAN algorithm and threshold *** compare it to the method of image matching *** simulation results show that the In ISAr reconstruction technique based on scattering point extraction method is a more effective one,with higher detection probability and has an ability to suppress the influence of noise and sidelobe effect,under the condition of noise.

关键词： Inverse synthetic aperture radar(ISAr) Interference ISAr Scattering point In ISAr imaging

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Enabling sea clutter power model in surface duct environment

Enabling sea clutter power model in surface duct environment

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European radar Conference (EUrAd)

作者： Peipei Wei Xiaoyan du Jianhui Liu Dept. of Communication National Digital Switching System Engineering & Technology R&D Center (NDSC) Zhengzhou China Dept. of Engineering Aarhus University Aarhus Denmark

Currently, the inversion of tropospheric duct refractivity from clutter (rFC) becomes a research hot spot. Sea clutter power model is essential for rFC. This paper investigates the effect of radar parameters on the sea clutter power in horizontally inhomogeneous surface duct environment, and further proposes a method to calculate sea clutter power based on radar parameters.

关键词： Clutter ducts Sea surface radar clutter refractive index Atmospheric modeling

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Pathological grading of Hepatocellular Carcinomas in MrI using a LASSO algorithm

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Journal of Physics: Conference Series 2018年第1期1053卷

作者： Fei Gao Bin Yan Jian Chen Minghui Wu dapeng Shi National Digital Switching System Engineering & Technological R&D Center ZhengZhou Henan Province China Department of Radiology Henan General Hospital ZhengZhou Henan Province China

To investigate the predictive ability of radiomics signature for preoperative pathological grading of Hepatocellular Carcinomas (HCC), the no contrast MrI images were integrated and a comprehensive analysis was conducted to predict clinical outcomes using the radiomics features. Variable selection via LASSO and logistic regression were used to select the most-predictive radiomics features for the pathological grading. Cross-Validation with receiver operating characteristic (rOC) analysis was performed and the area under the rOC curve (AUC) was employed as the prediction metric. Overall, the prediction performances by radiomics features showed statistically significant correlations with pathological grading, however, improvement on the prediction performance by combining T1WI and T2WI data, classification performance obtained the AUC 0.829 in training dataset and the AUC 0.742 in validation dataset. This study consisted of 170 consecutive patients (training dataset: n=125; validation dataset, n=45). The results showed radiomics signature was developed and validated to be a significant predictor for discrimination HCC pathological grading, which may serve as a complementary tool for the preoperative tumour grading in HCC.

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Fast parallel algorithm for three-dimensional distance-driven model in iterative computed tomography reconstruction

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Chinese Physics B 2015年第2期24卷 513-520页

作者：陈建林李磊王林元蔡爱龙席晓琦张瀚铭李建新闫镔 National Digital Switching System Engineering & Technological R&D Center

The projection matrix model is used to describe the physical relationship between reconstructed object and *** a model has a strong influence on projection and backprojection,two vital operations in iterative computed tomographic *** distance-driven model（ddM） is a state-of-the-art technology that simulates forward and back *** model has a low computational complexity and a relatively high spatial resolution;however,it includes only a few methods in a parallel operation with a matched model *** study introduces a fast and parallelizable algorithm to improve the traditional ddM for computing the parallel projection and backprojection *** proposed model has been implemented on a GPU（graphic processing unit） platform and has achieved satisfactory computational efficiency with no *** runtime for the projection and backprojection operations with our model is approximately 4.5 s and 10.5 s per loop,respectively,with an image size of 256×256×256 and 360 projections with a size of 512×*** compare several general algorithms that have been proposed for maximizing GPU efficiency by using the unmatched projection/backprojection models in a parallel *** imaging resolution is not sacrificed and remains accurate during computed tomographic reconstruction.

关键词： computed tomography iterative reconstruction parallelizable algorithm distance-driven model

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Entity disambiguation with markov logic network knowledge graphs

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International Journal of Performability engineering 2017年第8期13卷 1293-1303页

作者： Ma, Jiangtao Wei, Tao Qiao, Yaqiong Huang, Yongzhong Xie, Weibo Zhang, Chaoqin Wang, Yanjun Zhan, rui State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450002 China Zhengzhou University of Light Industry Zhengzhou450002 China National Digital Switching System Engineering and Technological R and D Center Zhengzhou451000 China Henan Institute of Engineering Computer College Zhengzhou451000 China North China University of Water Resources and Electric Power Zhengzhou450002 China

disambiguating named entities is an important problem in natural language processing, knowledge base, question answering systems. In the paper, we propose a Markov logic network knowledge graph solution for solving entity resolution problem. First, we employ knowledge graph to represent the entity relationship between linked entities in the knowledge base. Then, we utilize MLN to inference the inconsistent relationship in the knowledge graph, and disambiguate the entities in the process of entity disambiguation. As far as we know, inferencing with MLN is a first attempt for entity disambiguation in the knowledge graph. We evaluate the proposed solution with three real world knowledge bases and compare it with four baseline solutions. The experimental results demonstrate that our solution is 7% higher than other baseline methods with F1 measure. We also test our scheme and compare entity resolution systems on four datasets with three knowledge base corpora. Extensive experiments show that our solution achieves higher precision and recall than baseline solutions. © 2017 Totem Publisher, Inc. All rights reserved.

关键词： Natural language processing systems

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Secure Power and Subcarrier Auction in Uplink Fullduplex Cellular Networks

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China Communications 2015年第S1期12卷 157-165页

作者： LI Mingliang GUO Yunfei HUANG Kaizhi GUO Fei National Digital Switching System Engineering & Technological R&D Center

We consider a cellular network with a full-duplex base station, multiple uplink users and an eavesdropper. The full-duplex base station transmits jamming signals to degrade the eavesdropper channel when receiving secure multi-user signals. To maximize the secrecy rate of uplink communications, we propose a distributed ascending-clock auction(ACA) algorithm to allocate subcarriers and jamming power. Specifically, the impact of the self-interference of the full-duplex base station on the secrecy rate is considered. The proposed algorithm consists of two parts. Firstly, subcarriers and the jamming power are respectively priced by the base station. Secondly, users select the subcarrier and the jamming power based on the price. Moreover, the convergence of the proposed auction algorithm is mathematically proved. Simulation results show that the proposed auction algorithm is more beneficial to improve the uplink secrecy performance compared to traditional auction algorithms.

关键词： uplink auction physical layer security full-duplex self-interference

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A Collaborative Filtering recommendation Algorithm Based On Conditional Entropy Trust Model

A Collaborative Filtering Recommendation Algorithm Based On ...

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2016 3rd International Conference on Materials engineering,Manufacturing Technology and Control(ICMEMTC 2016)

作者： Yitao Wu Xingming Zhang Xiaofeng Qi Erning Xiao Liang Jin National Digital Switching System Engineering and Technological R&D Center

The traditional collaborative recommendation algorithm doesn't take the non-linear dependence between users into consider, which is not accurate enough in prediction. The collaborative filtering algorithm based on entropy can measure the nonlinear characteristics of users, but it can't reasonably describe the relationship between users and is subject to sparsity. To address this problem, conditional entropy trust model is proposed, which uses the conditional entropy to describe the non-linear dependence between users, and Laplace estimation is introduced to alleviate sparsity. A collaborative filtering algorithm based on the conditional entropy trust model(CECF) is designed. The experiments show that this algorithm doesn't increase the time complexity and significantly improve the degree of accuracy.

关键词： non-linear dependence conditional entropy similarity calculation collaborative filtering

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Physical Layer Secret Key Capacity Using Correlated Wireless Channel Samples

Physical Layer Secret Key Capacity Using Correlated Wireless...

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IEEE Global Communications Conference

作者： Xu Wang Liang Jin Kaizhi Huang Mingliang Li Yi Ming National Digital Switching System Engineering and Technological R&D Center

ISBN: (纸本)9781509013296

When extracting physical layer security secret key with multiple wireless channel samples, its capacity is affected by the time difference of channel sounding, terminal's moving speed, sampling period, the number of samples, and additive noise. In order to quantitatively analyze their effects and determine the constrains on the optimal sampling period, a closed-form solution to the physical layer secret key capacity in the time domain is derived over the uniform scattering environment. Simulation results indicate that the results of this paper can be applied to both the uniform and non-uniform scattering environment. Furthermore, the feasibility to extract physical layer secret key from the commercial Td-LTE and the promising co-frequency co-time full duplex communication systems is verified.

关键词： Physical layer security Physical layer secret key extraction Secret key capacity Correlated wireless channel samples Physical layer secret key Timedif TIME-dOMAIN wireless channels Additive noise sampling interval

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Principle of vector synthesis predistortion linearizers controlling AM/AM and AM/PM independently

Principle of vector synthesis predistortion linearizers cont...

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IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Wei-da Bai de-Wei Zhang Hai-Lin deng China National Digital Switching System Engineering and Technology R&D Center Zhengzhou China China National Digital Switching System Engineering and Technology R&D Center China

ISBN: (纸本)9781509013180

This paper using vector diagram illuminates the operation principle of vector synthesis predistortions and proves they can control amplitude modulation to amplitude modulation (AM/AM) and amplitude modulation to phase modulation (AM/PM) separately. A vector synthesis predistortion linearizer is designed to verify this thought and the results show the correctness of this thought.

关键词： Predistortion Attenuators Phase shifters Phase distortion Amplitude modulation Nonlinear distortion

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An Object detection Algorithm based on deformable Part Models with Bing Features

An Object Detection Algorithm based on Deformable Part Model...

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2016 5th International Conference on Advanced Materials and Computer Science(ICAMCS 2016)

作者： Chunwei Li Youjun Bu National Digital Switching System Engineering & Technological R&D Center

To solve the problem that the positioning strategy with sliding window approache requires exhaustive search in feature pyramids,the paper proposes an object detection algorithm based on deformable part models with Bing features to help object *** of all,input image are preprocessed with the objectness detection algorithm with Bing features and a set of potentia windows that may contain target objects are obtained,and then the deformable part model is regarde as the class-specific detector to match potential windows,at last Non-Maximum Suppression is use to merge and reduce window areas of results to obtain final detection *** experimental resul on Pascal VOC 2007 dataset show that the algorithm in the paper outperforms the original dPM in 1out of 20 classes,achieving an improvement of 2.7% mA P.

关键词： Object detection deformable part models binarized normed gradients feature

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