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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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dual-band conformal meander-line monopole antenna with coupled patch for unmanned aerial vehicle applications 11

Dual-band conformal meander-line monopole antenna with coupl...

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11th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2016

作者： Weiyu, Shen Guohu, Chen Guangqiu, Zhang National Digital Switching System Engineering and Technological R and D Center Zhengzhou China

ISBN: (纸本)9781509047420

In this paper, we present a meander-line monopole antenna for Unmanned Aerial Vehicle (UVA). In order to improve the resonant characteristic and expand the bandwidth, a couple of coupled patches have been added. It also improves the radiation characteristics in higher frequency. The antenna realizes omni-directional radiation in the horizontal plane when operating in780MHz-900MHz and 1.20GHz-2.28GHz. The antenna is conformed on the side of airframe and can be widely used as communication antenna on UVAs for its performance of dual-band and wideband. © 2016 IEEE.

关键词： Monopole antennas

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Image segmentation based on local Chan-Vese model optimized by max-flow algorithm 17

Image segmentation based on local Chan-Vese model optimized ...

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17th IEEE/ACIS International Conference on Software engineering, Artificial Intelligence, Networking and Parallel/distributed Computing, SNPd 2016

作者： Zhongguo, Li Lei, Zeng Ti, Wang Jian, Chen Bin, Yan National Digital Switching System Engineering and Technological R and D Center Zhengzhou China

ISBN: (纸本)9781509022397

Image segmentation can be used in non-destructive testing, tracking and recognition. Level set method for image segmentation has poor performance on efficiency. In this paper, we propose to use max-flow algorithm to optimize a locally improved Chan-Vese model for image segmentation in the presence of intensity inhomogeneity. The energy function of local Chan-Vese model is introduced firstly. This model consists of global term, local term and penalty term and the local term contributes the segmentation for images with intensity inhomogeneity. Then, we convert this energy function to the frame of Graph Cut whose energy function can be efficiently minimized by max-flow algorithm. As a result, the process of optimization of local Chan-Vese model can be accelerated by using max-flow algorithm. The experiments demonstrate that the proposed method can achieve satisfactory segmentation for images with intensity inhomogeneity as well as very high efficiency. © 2016 IEEE.

关键词： Image segmentation

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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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Novel Time redundant Flip-Flop Structure to Attenuate the Single-Event Transient 13

Novel Time Redundant Flip-Flop Structure to Attenuate the Si...

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2016 13th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT)

作者： Chunmei Hu Yankang du Jianjun Chen Yaqing Chi Haiyan Chen College of Computer National University of Defence Technology China National Digital Switching System Engineering & Technology R&D Center

ISBN: (纸本)9781467397209

As the technology scales down, the single-event transient(SET) has become a great concern for the reliability of integrated circuits(ICs). A novel time redundant flip-flop structure is proposed to detect and correct the SET pulse. The most advantage of this structure is that it has very little setup and hold time overhead and the architecture need not be modified to recover the system. HSPICE simulation is adopted verify the validation of this structure. Finally, we give the use of this flip-flop in the pipeline based architecture.

关键词： simulation Novel Time redundant Flip-Flop Structure to Attenuate the Single-Event Transient

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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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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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A Novel Communication Mechanism Based on Node potential Multi-path routing

A Novel Communication Mechanism Based on Node potential Mult...

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International Symposium on Optoelectronic Technology and Application 2016(OTA 2016)——Conf.15 Optical Communication and Optical Network

作者： Youjun Bu Chuanhao Zhang YiMing Jiang Zheng Zhang National Digital Switching System Engineering& Technological R&D Center Railway Police College

Withthe network scales rapidly and new network applications emerge frequently, bandwidth supply for today’s Internet could not catch up with the rapidincreasing requirements. Unfortunately, irrational

ISBN: (纸本)9781510607743

关键词： multi-path loop-free routing traffic engineering resource allocation multi-path Traffic engineering resource utilization traffic network Network routing network applications network links Web resources

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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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