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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

A Visualization System of Ship Navigation Environment Based on OSG 4

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A Visualization System of Ship Navigation Environment Based ...

4th IEEE International Conference on Image, Vision and Computing, ICIVC 2019

作者： Zhang, Chengcheng Chen, Jianxin Guo, Wei Nanjing University of Posts and Telecommunications Ministry of Education Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China

ISBN: (纸本)9781728123257

Maritime safety has become a hot topic over the past few years and ocean supervision is one of the most important parts for the maritime safety administration. Traditional ocean supervision technology usually uses two-dimensional (2D) images information to detect the illegal invasions. However, it is incomplete to represent the complex navigation environment for ships. Fortunately, with the development of virtual reality technology and deep learning, we are able to build a visualization system to establish the virtual 3D ocean scene for ship navigation with obtained information such as image and video in real time. In this paper, we design and implement such a visualization platform, which enables us to establish the 3D scene originated from images in real time, with the use of OSG, 3D modeling and deep learning network. © 2019 IEEE.

关键词： Virtual reality

Face Recognition Based on Two-stage CNN Combined with Transfer Learning 4

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Face Recognition Based on Two-stage CNN Combined with Transf...

4th IEEE International Conference on Image, Vision and Computing, ICIVC 2019

作者： Zhou, Anqi Chen, Jianxin DIng, Jie Pan, Zhaolai Nanjing University of Posts and Telecommunications Ministry of Education Nanjing Key Lab of Broadband Wireless Communication and Sensor Network Technology 210003 China

ISBN: (纸本)9781728123257

In recent years, pattern recognition has received wide attention, especially face recognition. Research shows that traditional methods have limits in face recognition under unrestricted environment because of illumination, facial expression, pose and so on. Deep learning is chosen to solve these problems. In this paper, we propose a complete method for face recognition under unrestricted environment by deep learning. First, we design a novel two-stage convolutional neural network for face detection and alignment. The first stage of the network aims at searching face windows and their bounding box regression vector. The second stage merges facial candidates which are covered highly. Then, the network finishes the task of face detection and alignment whose outputs are face regions and the position of the five facial landmarks. It achieves great performance on angle of faces in image and obtains accuracy of 96.1% on AFW and 98.9% on FDDB. Then faces are sent to convolutional neural network for transfer learning because of limited training samples. On the testing dataset, the accuracy of face recognition reaches to 95.3%, comparing with 89.1% of the original network. What' more, our method is better than the traditional algorithms and general CNN. © 2019 IEEE.

关键词： Face recognition

QoE optimization for traffic offloading from LTE to WiFi 8

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QoE optimization for traffic offloading from LTE to WiFi

8th IEEE Global Conference on Consumer Electronics, GCCE 2019

作者： Tian, Feng Yu, Yue Li, Dapeng Cui, Jingwu Dong, Yue Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing210003 China

ISBN: (纸本)9781728135755

In this paper, a novel QoE (Quality of Experience) optimization mechanism is proposed for the coexistence between LTE and WiFi networks, where traffic offloading is enabled from LTE to WiFi. Firstly, the throughput models of LTE and WiFi are analyzed, respectively. And then the users' satisfaction function is introduced to measure QoE. An optimal problem that maximizing the QoE of LTE network with guaranteeing the QoE of WiFi network, is formulated and solved by transformation and simplification. Simulation results indicate that traffic offloading can greatly improve the QoE of LTE network. © 2019 IEEE.

关键词： Quality of service

Research on the Loading Method of Logistics Vehicle and Cargo Based on IPSO Algorithm

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Research on the Loading Method of Logistics Vehicle and Carg...

Chinese Control Conference (CCC)

作者： Zewei Zhao Huqing Wang Zhe Sun Lei Xu Guangfu Gong Xiangpeng Xie Zhixin Sun Post Industry Technology Research and Development Center of the State Posts Bureau (Internet of Things Technology) Nanjing University of Posts and Telecommunications Nanjing P.R. China Post Big Data Technology and Application Engineering Research Center of Jiangsu Province Nanjing University of Posts and Telecommunications Nanjing P. R. China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing P.R. China Anhui Yougu Express Intelligent Technology Co. LTD Nanling Anhui P.R. China

Logistics vehicle and cargo matching problem is a typical combination optimization problem, which has important theoretical and application value in the field of logistics distribution. The proved particle swarm optimization (PSO) algorithm is one of the most extensive optimization methods studied in recent years, with excellent global search ability and convergence speed. Based on the IPSO algorithm, this paper proposes an effective IPSO algorithm model for the matching problem of logistics vehicles and goods, and conducts the corresponding comparative experiment. The final experimental results show that the algorithm has good results in practical application and can provide a feasible optimization method for solving the problem of logistics vehicles and goods.

关键词：

Measurement-device-independent quantum key distribution with insecure sources

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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

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

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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

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

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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

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

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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