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Applications of Lasers for Sensing and Free Space communications, LSC 2016

作者： Ding, Shengli Zhang, Jiankun Dang, Anhong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronic Engineering and Computer Science Peking University Beijing100871 China

Experimental research of a coherent wireless optical communication system was implemented with 1Gbps transmission rate. The results show that the system performs strong ability for mitigating the turbulent effects in ... 详细信息

ISBN: (纸本)9781943580200

关键词： Photonics

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Diode laser using narrow bandwidth interference filter at 852 nm and its application in Faraday anomalous dispersion optical filter

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Chinese Physics B 2016年第8期25卷 113-116页

作者：蒋招杰周琦陶智明张晓刚张盛楠祝传文林平卫陈景标 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science and Center for Quantum Information Technology Peking University Beijing 100871 China School of Photoelectric Information University of Electronic Science and Technology Chengdu 611731 China College of Science Guizhou University of Engineering Science Bijie 551700 China National Institute of Metrology Beijing 100029 China

We demonstrate an 852-nm external cavity diode laser（ECDL） system whose wavelength is mainly determined by an interference filter instead of other wavelength selective elements. The Lorentzian linewidth measured by the heterodyne beating between two identical lasers is 28.3 k Hz. Moreover, we test the application of the ECDL in the Faraday atomic *** saturated absorption spectrum, the transmission spectrum of the Faraday atomic filter at 852 nm is measured by using the ECDL. This interference filter ECDL method can also be extended to other wavelengths and widen the application range of diode laser.

关键词： filters diode lasers Faraday effect

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Research and implementation of neighbor management mechanism in communication level of general routing architecture based on Quagga 1

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2nd International Conference on Human Centered Computing, HCC 2016

作者： Dong, Xiafei Ma, Yue Wang, Zunliang Xu, Saihong Sun, Siyuan School of Computer Science Beijing University of Posts and Telecommunications Beijing100876 China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Beijing China Beijing China

ISBN: (数字)9783319318547

ISBN: (纸本)9783319318530

This paper analyzes the current research situation of general routing protocol platform, and neighbors management mechanism in typical routing protocols. And, put forward a effective neighbors management mechanism in general routing protocol platform, based on the research of the functionality set required by existing routing protocols. In this paper, the experimental results show that this mechanism can be applied to the generalized routing protocol platform, meets the needs for routing protocol, and support the new routing protocol development based on the platform. © Springer International Publishing Switzerland 2016.

关键词： Routing protocols

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Principles of Information Neutrality and counter measures against biased information 46

Principles of Information Neutrality and counter measures ag...

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46. Jahrestagung der Gesellschaft fur Informatik - 46th Annual Meeting of the German Informatics Society, INFORMATIK 2016

作者： Burger, Valentin Hirth, Matthias Hoûfeld, Tobias Tran-Gia, Phuoc University of Würzburg Institute of Computer Science Department of Communication Networks Germany University of Duisburg-Essen Department of Modeling of Adaptive Systems Essen Germany

ISBN: (纸本)9783885796534

The Internet serves as ubiquitous, prompt source of information in our society. Due to the giant amount of information, the access to the information relies on information processing mechanisms as implemented in search engines, product recommendation systems, or online social networks. As a result of the engineered preprocessing mechanism, the retrieved information is biased and does not represent a neutral view on the available information, while end-users often are not aware of this bias. In this article, we define the term "Information Neutrality", review current principles of information processing in the Internet and discuss influence factors hindering Information Neutrality as well as appropriate countermeasures. The main contribution of this article is to raise the awareness of Information Neutrality as an emerging key challenge in the Internet and to potentially consider Information Neutrality as a factor in the value-sensitive design of Internet-based services.

关键词： Social networking (online)

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FlowTrace： measuring round-trip time and tracing path in software-defined networking with low communication overhead

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Frontiers of Information Technology & Electronic Engineering 2017年第2期18卷 206-219页

作者： Shuo WANG Jiao ZHANG Tao HUANG Jiang LIU Yun-jie LIU F. Richard YU State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang 050081 China Beijing Advanced Innovation Center for Future Internet Technology Beijing University of Technology Beijing 100124 China Department of Systems and Computer Engineering Carleton University Ottawa ON KIS 5B6 Canada

：In today＇s networks, load balancing and priority queues in switches are used to support various quality-of-service （QoS） features and provide preferential treatment to certain types of traffic. Traditionally, network operators use ‘traceroute＇ and ‘ping＇ to troubleshoot load balancing and QoS problems. However, these tools are not supported by the common OpenFlow-based switches in software-defined networking （SDN）. In addition, traceroute and ping have potential problems. Because load balancing mechanisms balance flows to different paths, it is impossible for these tools to send a single type of probe packet to find the forwarding paths of flows and measure latencies. Therefore, tracing flows＇ real forwarding paths is needed before measuring their latencies, and path tracing and latency measurement should be jointly considered. To this end, FlowTrace is proposed to find arbitrary flow paths and measure flow latencies in OpenFlow networks. FlowTrace collects all flow entries and calculates flow paths according to the collected flow entries. However, polling flow entries from switches will induce high overhead in the control plane of SDN. Therefore, a passive flow table collecting method with zero control plane overhead is proposed to address this problem. After finding flows＇ real forwarding paths, FlowTrace uses a new measurement method to measure the latencies of different flows. Results of experiments conducted in Mininet indicate that FlowTrace can correctly find flow paths and accurately measure the latencies of flows in different priority classes.

关键词： Software-defined networking Network monitoring Traceroute

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Fast high-resolution miniature two-photon microscopy for brain imaging in freely-behaving mice at the single-spine level

Fast high-resolution miniature two-photon microscopy for bra...

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International Conference on Photonics and Imaging in Biology and Medicine, PIBM 2017

作者： Zong, Weijian Wu, Runlong Li, Mingli Hu, Yanhui Li, Yijun Li, Jinghang Rong, Hao Wu, Haitao Xu, Yangyang Lu, Yang Fan, Ming Zhou, Zhuan Zhang, Yunfeng Wang, Aimin Cheng, Heping Chen, Liangyi State Key Laboratory of Membrane Biology Institute of Molecular Medicine Peking-Tsinghua Center for Life Sciences Peking University Beijing100871 China Department of Cognitive Sciences Institute of Basic Medical Sciences Beijing100850 China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China Department of Neurobiology Institute of Basic Medical Sciences Beijing100850 China

ISBN: (纸本)9781943580354

Recent developments in miniaturized microscopes have furthered the quest to visualize brain activities and structural dynamics in animals engaged in self-determined behaviors. However, it remains an unmet challenge to resolve activity at single dendritic spines, the elemental units underlying neuronal computation, in freely-behaving animals. Here, we report the design, testing, and application of a fast, high-resolution, miniaturized two-photon microscope (FIRM-TPM) that accomplishes this goal. With a headpiece weighing 2.15 g and a new type of hollow-core photonic crystal fiber to deliver 920-nm femtosecond laser pulses, the FIRM-TPM is capable of imaging commonly used biosensors at high spatiotemporal resolution (0.64 μm laterally and 3.35 μm axially, 40 Hz at 256 × 256 pixels). Its micro-electromechanical systems scanner also enables random-access capability and free-line scanning at up to 10,000 Hz. It compares favorably with benchtop two-photon microscopy and miniature wide-field fluorescence microscopy in the structural and functional imaging of Thy1-GFP- or GCaMP6f-labeled neurons. Further, we demonstrate its unique application and robustness with hour-long recording of neuronal activities down to the level of spines in mice experiencing vigorous body and head movements or engaging in social interaction. Thus, our new generation miniature microscope provides neuroscientists the long-sought tool-of-choice for imaging the brain at the synaptic level in freely-behaving animals. © 2017 OSA.

关键词： Photons

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Preface

ICMLCA 2021 - 2nd International Conference on Machine Learni...

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ICMLCA 2021 - 2nd International Conference on Machine Learning and computer Application 2021年 iii页

作者： Ning, Xiansheng Feng, Yongxin Zhang, Wenbo Yue, Mingkai Du, Ke-Lin Huang, Shutao Zhou, Fang Ba, Shuhong Fu, Chong Shui, Penglang Xu, Shuwen Wu, Sheng Wang, Shushan Du, Zhonghua Gao, Zhijun Fan, Chunlong Li, Yufeng Wang, Yupeng Liu, Qingli Yu, Jingang Yin, Zhenyu Zhang, Deyu Gao, Hongwei Wen, Feng Guo, Cean Hao, Yongping Chan, Yung-Kuan Pavlovich, Vinogradov Gennady Kirpichnikova, Irina Qian, Zhihong Ivanov, Dmitriy V. Zhou, Xueguan Nezamabadi-Pour, Hossein Yang, Qing Zhang, Yongtang Liao, Haibin Huang, Ying Srinivasan, Kathiravan Xu, Zhenghua Pachori, Ram Bilas Zhang, Jialu AlShawabkeh, Mahmoud Guo, Chengjun Chaugule, Archana Ajit Lima, Alberto Sampaio Liu, Huayong Vidal, Jorge Maestre Alrshah, Mohamed A. Ghafoor, Kayhan Zrar Kubicek, Jan Chaugule, Archana Ajit Rodríguez-Pérez, Miguel Kumar, Gulshan Nasri, Mehdi Borrego, Carlos Persico, Valerio Wagh, Sanjeev Yan, Wenjun Yang, Li Yang, Dawei Xing, Yongkang Yang, Huadong Shang, Chengguo Chang, Xingong Shi, Hongbo Li, Aijun Feng, Liping Lv, Yali Liang, Minfu Wang, Kaixuan Bai, Zengliang Liang, Anhui Nan, Zhihong Ji, Suqin Chang, Liwei Zhou, Hongbin Yao, Chunli Cao, Guodong Zhang, Juling School of Information Science and Engineering Shenyang Ligong University China School of Equipment Engineering Shenyang Ligong University China Concordia University Canada School of Automotive and Transportation Shenyang Ligong University China School of Information Science and Engineering Shenyang Ligong University China School of Equipment Engineering Shenyang Ligong University China Northeastern University China Xidian University China Beijing University of Posts and Telecommunications China Beijing Institute of Technology China Nanjing University of Science & Technology China Shenyang Jianzhu University China Shenyang Aerospace University China Dalian University China Shenyang Institute of Computing Technology Chinese Academy of Sciences China Shenyang Ligong University China National Chun Hsing University Taiwan Department of Informatics and Applied Mathematics Russia South Ural State University Russia Jilin University China Samara State University of Transport Russia Naval Universit of Engineering China Shahid Bahonar University of Kermanto Iran Central China Normal University China Guangdong Neusoft Institute China Hubei University of Science and Technology China Liuzhou Railway Vocational Technical College China Vellore Institute of Technology India Hebei University of Technology China Indian Institute of Technology Indore India Xiangnan University China Guangxi Normal University for Nationalities China UESTC China Pimpri-Chinchwad College of Engineering & Research India Federal University of Ceará Brazil Complutense University of Madrid Spain Universiti Putra Malaysia Malaysia Shanghai Jiao Tong University China VŠB - Technical University of Ostrava Cuw Pimpri-Chinchwad College of Engineering & Research Ravet Pune India University of Vigo Spain Division of Research and Development India Islamic Azad University Iran Departament Enginyeria of Information Comunicacions Autonomous University of Barcelona Spain Opportunistic Networks United States Univers

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Photometry of β lyrae in 2018 by the brite satellites

arXiv

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arXiv 2019年

作者： Rucinski, Slavek M. Pigulski, Andrzej Kuschnig, Rainer Moffat, Anthony F.J. Popowicz, Adam Pablo, H. Wade, G.A. Weiss, Werner W. Zwintz, Konstanze Department of Astronomy and Astrophysics University of Toronto 50 St. George St. TorontoONM5S 3H4 Canada Instytut Astronomiczny Uniwersytet Wroclawski Kopernika 11 Wroclaw51-622 Poland Institute of Communication Networks and Satellite Communications Graz University of Technology Inffeldgasse 12 Graz8010 Austria Département de physique Université de Montréal C.P. 6128 Succursale Centre-Ville MontréalQCH3C 3J7 Canada Faculty of Automatic Control Electronics and Computer Science Institute of Automatic Control Politechnika Slaska ´ Akademicka 16 Gliwice44-100 Poland American Association of Variable Star Observers 49 Bay State Road CambridgeMA02138 United States Department of Physics and Space Science Royal Military College of Canada PO Box 17000 KingstonONK7K 7B4 Canada Institut für Astrophysik Universität Wien Türkenschanzstrasse 17 Wien1180 Austria Universität Innsbruck Institut für Astro- und Teilchenphysik Technikerstraße 25 InnsbruckA-6020 Austria

Observations of β Lyr in four months of 2018 by three BRITE Constellation satellites (the red-filter BTr and BHr, and the blue-filter BLb) permitted a first, limited look into the light-curve variability in two spectral bands. The variations were found to be well correlated outside the innermost primary minima with the blue variations appearing to have smaller amplitudes than the red;this reduction may reflect their presumed origin in the cooler, outer parts of the accretion disk. This result must be confirmed with more extensive material as the current conclusions are based on observations spanning slightly less than three orbital cycles of the binary. The assumption of an instrumental problem and the applied corrections made to explain the unexpectedly large amplitude of the red-filter light-curve observed with the BTr satellite in 2016 are fully confirmed by the 2018 results. Copyright © 2019, The Authors. All rights reserved.

关键词： Photometry

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High speed continuous variable source-independent quantum random number generation

arXiv

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arXiv 2017年

作者： Xu, Bingjie Chen, Ziyang Li, Zhengyu Yang, Jie Su, Qi Huang, Wei Zhang, Yichen Guo, Hong Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Cryptography Beijing100878 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Peking University Beijing100871 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

As a fundamental phenomenon in nature, randomness has a wide range of applications in the fields of science and engineering. Among different types of randomnumber generators (RNG), quantumrandomnumber generator (QRNG) is a kind of promising RNG as it can provide provable true randomnumbers based on the inherent randomness of fundamental quantum processes. Nevertheless, the randomness from a QRNG can be diminished (or even destroyed) if the devices (especially the entropy source devices) are not perfect or ill-characterized. To eliminate the practical security loopholes from the source, sourceindependentQRNGs, which allow the source to have arbitrary and unknown dimensions, have been introduced and become one of the most important semi-device-independent QRNGs. Herein a method that enables ultra-fast unpredictable quantum random number generation from quadrature fluctuations of quantum optical field without any assumptions on the input states is proposed. Particularly, to estimate a lower bound on the extractable randomness that is independent from side information held by an eavesdropper, a new security analysis framework is established based on the extremality of Gaussian states, which can be easily extended to design and analyze new semi-device-independent continuous variable QRNG protocols. Moreover, the practical imperfections of the QRNG including the effects of excess noise, finite sampling range, finite resolution and asymmetric conjugate quadratures are taken into account and quantitatively analyzed. Finally, the proposed method is experimentally demonstrated to obtain high secure randomnumber generation rates of 15.07Gbits/s in off-line configuration and can potentially achieve 6 Gbits/s by real-time post-processing. Copyright © 2017, arXiv, All rights reserved.

关键词： Random processes

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Efficient rate-adaptive reconciliation for continuous-variable quantum key distribution

arXiv

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arXiv 2017年

作者： Wang, Xiangyu Zhang, Yichen Yu, Song Bingjie, X.U. Li, Zhengyu Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications No. 10 Xitucheng Road Beijing100876 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication No. 6 Chuangye Road Chengdu610041 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Center for Computational Science and Engineering Peking University No. 5 Yiheyuan Road Beijing100871 China

Information reconciliation protocol has a significant effect on the secret key rate and maximal transmission distance of continuous-variable quantum key distribution (CV-QKD) systems. We propose an efficient rate-adaptive reconciliation protocol suitable for practical CV-QKD systems with time-varying quantum channel. This protocol changes the code rate of multi-edge type low density parity check codes, by puncturing (increasing the code rate) and shortening (decreasing the code rate) techniques, to enlarge the correctable signal-to-noise ratios regime, thus improves the overall reconciliation efficiency comparing to the original fixed rate reconciliation protocol. We verify our rate-adaptive reconciliation protocol with three typical code rate, i.e., 0.1, 0.05 and 0.02, the reconciliation efficiency keep around 93.5%, 95.4% and 96.4% for different signal-to-noise ratios, which shows the potential of implementing high-performance CV-QKD systems using single code rate matrix. Copyright © 2017, The Authors. All rights reserved.

关键词： Efficiency

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