检索结果-内蒙古大学图书馆

SSRN 2021年

作者： Wang, Hao Zhao, Bin Liu, Guohua Sensor Technology Intelligent System Lab College of Electronic Information and Optical Engineering Nankai University Tianjin 300350 China School of Artificial Intelligence Guilin University of Electronic Technology Guangxi Guilin541004 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350 China Engineering Research Center of thin film optoelectronics technology Ministry of Education Nankai University Tianjin 300350 China

The key to video understanding is to capture temporal information. 3D CNNs can achieve good performance by directly fusing spatial and temporal features but are computationally intensive. Conventional 2D CNNs perform well in image recognition, but the inability to extract temporal features leads to poor performance in video action recognition. In this work, we aim to catch temporal relationships for video action recognition. To this end, we propose a Temporal and Motion Enhancement (TME) module consisting of two submodules: Multi-path Temporal Enhancement(MTE) module and Long Short-range Motion Enhancement(LSME) module. The MTE module consists of four paths: Residual path, Temporal Aggregation(TA) path, Channel-wise Temporal Excitation(CTE) path and Spatial-attention Temporal Excitation(STE) path. The Residual path makes part of the information in the original activation accessible. The TA path employs convolution on temporal dimension to characterize temporal representation. The CTE path rebuilds channel-wise feature relationships in terms of the temporal aspect. The STE path introduces attention mechanisms and explores the temporal modeling. We aggregate features of different paths by splitting channels, which is efficient for model inference. The LSME module calculates feature-level temporal differences between long and short range frames, which enhances the motion-related features. TME module is plug-and-play and can be inserted into 2D CNNs to form an effective TMENet with limited extra computational cost. The extensive experiments on several action recognition datasets, such as Kinetics400, Something-Something V1\&V2, HMDB51, and UCF101, demonstrate that the TMENet outperforms the state-of-the-art methods with high efficiency. Code will be released soon. © 2021, The Authors. All rights reserved.

关键词： Image recognition

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An Iterative Graph Spectral Subtraction Method for Speech EnhancementI

arXiv

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arXiv 2020年

作者： Yan, Xue Yang, Zhen Wang, Tingting Guo, Haiyan Department of Communication and Information Engineering Nanjing University of Posts and Telecommunications National Engineering Research Center of Communication and Sensor Network Technology

In this paper, we investigate the application of graph signal processing (GSP) theory in speech enhancement. We first propose a set of shift operators to construct graph speech signals, and then analyze their spectrum in the graph Fourier domain. By leveraging the differences between the spectrum of graph speech and graph noise signals, we further propose the graph spectral subtraction (GSS) method to suppress the noise interference in noisy speech. Moreover, based on GSS, we propose the iterative graph spectral subtraction (IGSS) method to further improve the speech enhancement performance. Our experimental results show that the proposed operators are suitable for graph speech signals, and the proposed methods outperform the traditional basic spectral subtraction (BSS) method and iterative basic spectral subtraction (IBSS) method in terms of both signal-to-noise ratios (SNR) and mean Perceptual Evaluation of Speech Quality (PESQ). Copyright © 2020, The Authors. All rights reserved.

关键词： Speech enhancement

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Experimental measurement-device-independent quantum key distribution with uncharacterized sources

Experimental measurement-device-independent quantum key dist...

引用

OSA Quantum 2.0 Conference, QUANTUM 2020

作者： Wang, Qin Institute of quantum information and technology Nanjing University of Posts and Telecommunications Nanjing210003 China "Broadband Wireless Communication and Sensor Network Technology" Key Lab of Ministry of Education NUPT Nanjing210003 China "Telecommunication and Networks" National Engineering Research Center NUPT Nanjing210003 China

We carry out a proof-of-principle demonstration of three-state uncharacterized measurement-device-independent quantum key distribution over 170 km, achieving the longest transmission distance under the same security l... 详细信息

ISBN: (纸本)9781557528209

关键词： Quantum cryptography

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An open-source project for real-time image semantic segmentation

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Science China(Information Sciences) 2019年第12期62卷 246-247页

作者： Quan ZHOU Yu WANG Jia LIU Xin JIN Longin Jan LATECKI National Engineering Research Center of Communication and Network Technology Nanjing University of Posts and Telecommunications Key Laboratory of Ministry of Education for Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Beijing Electronic Science and Technology Institute State Key Laboratory of Virtual Reality Technology and Systems Beihang University Department of Computer and Information Sciences Temple University

Recent years have witnessed great progress of deep convolutional neural networks (DCNNs) for solving scene understanding tasks [1–3]. These advances prefer to construct deeper and larger net-

关键词： image An open-source project for real-time image semantic segmentation

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Study on the segmentation method of multi-phase CT liver tumor based on dual channel U-Nets

Study on the segmentation method of multi-phase CT liver tum...

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2020 International Symposium on Automation, Information and Computing, ISAIC 2020

作者： Xu, Changchang Hu, Dong Zhang, YaoDong Pang, Yuwei Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications Nanjing210003 China Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210003 China Education Ministry’s Engineering Research Center of Ubiquitous Network and Heath Service Nanjing University of Posts and Telecommunications Nanjing210003 China first clinical medical college of Nanjing Medical University Nanjing University of Posts and Telecommunications Nanjing210003 China

As a common malignant tumor disease, hepatocellular carcinoma is the most common cancers in the world. The incidence of hepatocellular carcinoma in China is higher than that in the world. Therefore, it is very important for doctors to separate liver and tumor from CT images by means of computer-aided diagnosis and treatment. In this paper, a multiscale DC-CUNets network liver tumor segmentation method is proposed to enhance the fusion of multi-phase image features in CT, the scale of liver tumors, and the optimization of network training process. (1) A multistage CT liver tumor segmentation method based on two-channel cascaded U-Nets (DC-CUNets) is proposed. The liver was segmented using the first-order U-Net, and then the segmented area of interest of the liver was input into the second-order U-Net network to segment liver tumors. We designed two-channel U-Nets to learn the image characteristics of CT images in arterial and venous phases respectively, and to achieve two-channel feature fusion through feature cascade to improve the overall accuracy of liver tumor segmentation.(2) A multistage CT liver tumor segmentation method based on multiscale DC-CUNets was proposed. For the scale problem of liver tumors, we designed a two-layer multiscale void convolution module to obtain image features at different scales for large, medium and small tumors, and fuse the multiscale features at the output of the module. We have replaced the convolution layer of the fourth module in the second-order two-channel liver tumor segmentation U-Nets by the two-layer multiscale cavity convolution module to implement multiscale DC-CUNets. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Convolution

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Research on Photovoltaic Power Generation Based on Multi-Channel PID

Research on Photovoltaic Power Generation Based on Multi-Cha...

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Image Processing, Electronics and Computers (IPEC), Asia-Pacific Conference on

作者： Juan Liu Xusheng Hu Rui Zheng Ma’anshan Technical College Ma’anshan China Ma’anshan Engineering Technology Research Center for Wireless Sensor Network and IntelliSense Wanjiang University of Technology Ma’anshan China Anhui Provincial Engineering Laboratory on Information Fusion and Control of Intelligent Robot Anhui Normal University Wuhu China

ISBN: (纸本)9781728190181;9781728190198

In order to improve the utilization efficiency of solar energy, based on the in-depth study of the characteristics of solar energy, a control scheme based on daily motion trajectory was designed. In this scheme, single chip microcomputer is used as the controller to realize the output of SPWM waveform, and the compound PID with multiplexing selection is used to control the Angle of solar panel, so as to achieve the effect of fast and sensitive tracking of solar illumination. Through the angle sensor, on-line monitoring of the angle data of the solar panel, according to the intelligent control optimization algorithm, combined with single-chip microcomputer control technology, a more optimized control scheme is proposed. The experimental data show that the design effect is good and the expected control goal is achieved.

关键词： Multiplexing Tracking Lighting Solar energy Microcomputers Trajectory Solar panels

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Measurement-device-independent quantum key distribution with insecure sources

arXiv

引用

arXiv 2021年

作者： Ding, Hua-Jian Zhou, Xing-Yu Zhang, Chun-Hui Li, Jian Wang, Qin Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing210003 China "Broadband Wireless Communication and Sensor Network Technology" Key Lab of Ministry of Education NUPT Nanjing210003 China "Telecommunication and Networks" National Engineering Research Center NUPT Nanjing210003 China

Measurement-device-independent quantum key distribution (MDI-QKD) can eliminate all detector side-channel loopholes and has shown excellent performance in long-distance secret keys sharing. Conventional security proofs, however, require additional assumptions on sources and that can be compromised through uncharacterized side channels in practice. Here, we present a general formalism based on reference technique to prove the security of MDI-QKD against any possible sources' imperfection and/or side channels. With this formalism, we investigate the asymptotic performance of single-photon sources without any extra assumptions on the state preparations. Our results highlight the importance of transmitters' security. © 2021, CC BY.

关键词： Quantum cryptography

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Experimental measurement-device-independent quantum key distribution with the double-scanning method

arXiv

引用

arXiv 2021年

作者： Chen, Yi-Peng Liu, Jing-Yang Sun, Ming-Shuo Zhou, Xing-Yu Zhang, Chun-Hui Li, Jian Wang, Qin Institute of quantum information and technology Nanjing University of Posts and Telecommunications Nanjing210003 China Broadband Wireless Communication and Sensor Network Technology Key Lab of Ministry of Education NUPT Nanjing210003 China "Telecommunication and Networks" National Engineering Research Center NUPT Nanjing210003 China

The measurement-device-independent quantum key distribution (MDI-QKD) can be immune to all detector side-channel attacks. Moreover, it can be easily implemented combining with the matured decoy-state methods under current technology. It thus seems a very promising candidate in practical implementation of quantum communications. However, it suffers from severe finite-data-size effect in most existing MDI-QKD protocols, resulting in relatively low key rates. Recently, Jiang et al. [Phys. Rev. A 103, 012402 (2021)] proposed a double-scanning method to drastically increase the key rate of MDI-QKD. Based on Jiang et al.’s theoretical work, here we for the first time implement the double-scanning method into MDI-QKD and carry out corresponding experimental demonstration. With a moderate number of pulses of 1010, we can achieve 150 km secure transmission distance which is impossible with all former methods. Therefore, our present work paves the way towards practical implementation of MDI-QKD. © 2021, CC BY.

关键词： Quantum cryptography

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Both qubits of the singlet state can be steered simultaneously by multiple independent observers via sequential measurement

arXiv

引用

arXiv 2021年

作者： Liu, Kun Liu, Tongjun Fang, Wei Li, Jian Wang, Qin Institute of quantum information and technology Nanjing University of Posts and Telecommunications Nanjing210003 China "Broadband Wireless Communication and Sensor Network Technology" Key Lab of Ministry of Education NJUPT Nanjing210003 China "Telecommunication and Networks" National Engineering Research Center NJUPT Nanjing210003 China

Quantum correlation is a fundamental property which distinguishes quantum systems from classical ones, and it is also a fragile resource under projective measurement. Recently, it has been shown that a subsystem in entangled pairs can share nonlocality with multiple observers in sequence. Here we present a new steering scenario where both subsystems are accessible by multiple observers. And it is found that the two qubits in singlet state can be simultaneously steered by two sequential observers, respectively. Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum optics

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Reference-frame-independent measurement-device-independent quantum key distribution with imperfect sources

arXiv

引用

arXiv 2021年

作者： Zhu, Jian-Rong Zhang, Chun-Mei Wang, Qin Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing210003 China Broadband Wireless Communication Sensor Network Technology Key Lab of Ministry of Education NUPT Nanjing210003 China Telecommunication and Networks National Engineering Research Center NUPT Nanjing210003 China

Reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) can remove all potential detector side-channel attacks and the requirement of real-time alignment of reference frames. However, all previous RFI-MDI-QKD implementations assume the perfect state preparation in sources, which is impractical and may lead to security loopholes. Here, we propose a RFI-MDI-QKD protocol which is robust against state preparation flaws. Comparing to the conventional six-state RFI-MDI-QKD, our scheme can be realized with only four flawed states, which improves the practical security of RFI-MDI-QKD and simplifies the experimental implementation. In addition, simulation results demonstrate that source flaws in Z basis have adverse effect on the performance of RFI-MDI-QKD while the source flaws in X and Y bases have almost no effect. We hope that this work could provide a valuable reference for practical implementations of RFI-MDI-QKD. © 2021, CC BY.

关键词： Quantum cryptography

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