检索结果-内蒙古大学图书馆

IEEE Global communications Conference

作者： Haojie Feng Yanxiang Jiang Dusit Niyato Fu-Chun Zheng Xiaohu You National Mobile Communications Research Laboratory Southeast University Nanjing China State Key Laboratory of Integrated Services Networks Xidian University Xi'an China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China School of Computer Engineering Nanyang Technological University (NTU) Singapore School of Electronic and Information Engineering Harbin Institute of Technology Shenzhen China

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

In this paper, the content popularity prediction problem in cache-enabled fog radio access networks (F-RANs) is investigated. In order to make the popularity prediction accurate and adaptive, we propose to learn the corresponding popularity prediction model for every content class from the preprocessed popularity series by training a simplified bidirectional long short-term memory (Bi-LSTM) network, and further use it to help build a content classifier in terms of content popularity trend in the training phase. Then, content popularity can be predicted by the right prediction model with respect to the corresponding content class in the predicting phase. Considering that it is hard to collect enough data about numerous content features through F-APs, we propose to only use the number of requests. Our proposed content popularity prediction policy offers a high prediction accuracy with low computational complexity by transferring the high complexity tasks from the predicting phase to the training phase. Simulation results show that the cache hit rate of our proposed policy approaches the optimal performance.

关键词： Predictive models Training Market research Computational modeling Machine learning Radio access networks Adaptation models

来源：评论

学校读者我要写书评

暂无评论

Additional Rayleigh-scattering phase in distributed acoustic sensing system

Additional Rayleigh-scattering phase in distributed acoustic...

引用

Optical Fiber Sensors, OFS 2018

作者： He, Xiangge Gu, Lijuan Liu, Fei Yi, Duo Zhang, Min Chen, Zhangyuan School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Physics Peking University Beijing100871 China Institute of Ocean Research Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China

The theoretical model for distributed acoustic sensing system is developed which agrees well with the experiment, and the phase fading phenomenon caused by additional Rayleigh-scattering phase is studied for the first... 详细信息

ISBN: (纸本)9781943580507

关键词： Rayleigh scattering

来源：评论

学校读者我要写书评

暂无评论

Optomechanical oscillation in the lithium niobate photonic crystal nanocavity

Optomechanical oscillation in the lithium niobate photonic c...

引用

Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Jiang, Haowei Liang, Hanxiao Luo, Rui Chen, Xianfeng Chen, Yuping Lin, Qiang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institute of Optics University of Rochester RochesterNY14627 United States Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States

Nonlinear optomechanical oscillations are observed in the lithium niobate photonic crystal nanocavity. High harmonic oscillations up to 14th order are achieved, which may function as a mechanical frequency comb. ©... 详细信息

ISBN: (纸本)9781943580453

关键词： Lithium

来源：评论

学校读者我要写书评

暂无评论

Embedded whispering-gallery mode microsphere resonator in a tapered hollow annular core fiber

引用

Photonics Research 2018年第12期6卷 1124-1129页

作者： JIAWEI WANG XIAOBEI ZHANG MING YAN LEI YANG FENGYU HOU WEN SUN XIAOTONG ZHANG LIBO YUAN HAI XIAO TINGYUN WANG Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University The Key Laboratory of In-Fiber Integrated Optics Ministry of Education College of Science Harbin Engineering University School of Electronic Engineering and Automation Guilin University of Electronic Technology Department of Electrical and Computer Engineering Clemson University

We propose and demonstrate a tapered hollow annular core fiber (HACF) coupler for excitation of whisperinggallery modes (WGMs) of an embedded microsphere resonator. The coupler is simply fabricated by fusion splicing of a segment of HACF with the single-mode fiber (SMF), and then improved by tapering the splicing joint to reduce the cone-apex angle. Therefore, the coupling efficiency from the SMF to the HACF is enhanced to excite various WGMs via evanescent field coupling. Normal positive, negative symmetrical Lorentzian and asymmetric Fano line shapes can be obtained by varying the resonator size and location. Another interesting phenomenon is observed that a higher Q-factor mode in a lower Q-factor mode has a contrast as high as 58. Temperature sensing with good stability is also demonstrated. This embedded WGM microsphere resonator in the tapered HACF is expected to promote environmental adaptability in practical applications due to its simplicity and

关键词： Single mode fiber (SMF) cavity Embedded WGM microsphere resonator

来源：评论

学校读者我要写书评

暂无评论

Full-space Cloud of Random Points with a Scrambling Metasurface

引用

Light(Science & Applications) 2018年第1期7卷 467-474页

作者： Zile Li Qi Dai Muhammad Q.Mehmood Guangwei Hu Boris Luk’yanchuk Jin Tao Chenglong Hao Inki Kim Heonyeong Jeong Guoxing Zheng Shaohua Yu Andrea Alù Junsuk Rho Cheng-Wei Qiu School of Electronic Information Wuhan UniversityWuhan 430072China NOEIC State Key Laboratory of Optical Communication Technologies and NetworksWuhan Research Institute of Posts and TelecommunicationsWuhan 430074China Department of Electrical Engineering Information Technology University of the PunjabFerozpur Road54000 LahorePakistan Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Advanced Science Research Center City University of New YorkNew York 10031USA Data Storage Institute A*STAR(Agency for ScienceTechnology and Research)2 Fusionopolis Way#08-01Innovis 138634Singapore Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

With the rapid progress in computer science,including artificial intelligence,big data and cloud computing,full-space spot generation can be pivotal to many practical applications,such as facial recognition,motion detection,augmented reality,*** opportunities may be achieved by using diffractive optical elements(DOEs)or light detection and ranging(LIDAR).However,DOEs suffer from intrinsic limitations,such as demanding depth-controlled fabrication techniques,large thicknesses(more than the wavelength),Lambertian operation only in half space,*** nevertheless relies on complex and bulky scanning systems,which hinders the miniaturization of the spot ***,inspired by a Lambertian scatterer,we report a Hermitian-conjugate metasurface scrambling the incident light to a cloud of random points in full space with compressed information density,functioning in both transmission and reflection *** 4044 random spots are experimentally observed in the entire space,covering angles at nearly 90°.Our scrambling metasurface is made of amorphous silicon with a uniform subwavelength height,a nearly continuous phase coverage,a lightweight,flexible design,and low-heat ***,it may be mass produced by and integrated into existing semiconductor foundry *** work opens important directions for emerging 3D recognition sensors,such as motion sensing,facial recognition,and other applications.

关键词： conjugate directions amorphous

来源：评论

学校读者我要写书评

暂无评论

Adaptive HARQ with Channel State Information in Inter-HAP FSO Links 18

Adaptive HARQ with Channel State Information in Inter-HAP FS...

引用

18. ITG-Fachtagung Photonische Netze - 18th ITG Conference on Photonic networks

作者： Parthasarathy, Swaminathan Kirstädter, Andreas Giggenbach, Dirk WesslingD-82234 Germany Institute of Communication Networks and Computer Engineering University of Stuttgart StuttgartD-70569 Germany

ISBN: (纸本)9783800744275

This paper investigates the impact of different Channel State Information (CSI) on code-rate adaptive Hybrid ARQ protocols over inter-HAP (High Altitude Platform) FSO fading channel. Perfect, delayed, reciprocal and fixed-mean CSI are considered in the investigation. We study in particular the transmission efficiency of HARQ protocols where the code rate of a RS code is adapted to different CSI. Simulation results show that adaptive code rate based on correctly chosen CSI significantly outperforms HARQ with a non adaptive mechanism providing improved overall performance. © 2017 VDE VERLAG GMBH

关键词： Channel state information

来源：评论

学校读者我要写书评

暂无评论

A 420nm Blue Diode Laser for the Potential Rubidium Optical Frequency Standard

引用

Chinese Physics Letters 2017年第7期34卷 118-121页

作者：张盛楠张晓刚涂建辉蒋招杰商浩森祝传文杨炜崔敬忠陈景标 State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering and Computer Science Peking University National Key Laboratory of Science and Technology on Vacuum Technology & Physics Lanzhou Institute of PhysicsChina Academy of Space Technology

We report a 42Ohm external cavity diode laser with an interference filter （IF） of 0.5am narrow-bandwidth and 79% high transmission, which is first used for Rb optical frequency standard. The IF and the cat-eye reflector are used for selecting wavelength and light feedback, respectively. The measured laser linewidth is 24 kHz when the diode laser is free running. Using this narrow-linewidth IF blue diode laser, we realize a compact Rb optical frequency standard without a complicated PDH system. The preliminary stability of the Rb optical frequency standard is 2 × 10^-13 at I s and decreases to 1.9 ×10^-14 at 1000s. The narrow-linewidth characteristic makes the IF blue diode laser a well suited candidate for the compact Rb optical frequency standard.

关键词： A 420nm Blue Diode Laser for the Potential Rubidium Optical Frequency Standard Rb kHz

来源：评论

学校读者我要写书评

暂无评论

Color Based Person Tracking with Illumination Compensation by using Multiple Statistics of Scene

Color Based Person Tracking with Illumination Compensation b...

引用

International Symposium on Soft Computing and Intelligent Systems (SCIS)

作者： Motonori Doi Akihiro Tsujimoto Akira Kimachi Shogo Nishi Norikazu Ikoma Dept. of Telecommunications and Computer Networks Osaka Electro-Communication University Neyagawa Japan Graduate School of Engineering Osaka Electro-Communication University Neyagawa Japan Dept. of Engineering Informatics Osaka Electro-Communication University Neyagawa Japan Dept. of Electrical Electronics and Communication Engineering Nippon Institute of Technology Saitama Japan

ISBN: (纸本)9781538626344;9781538626337

Person tracking is an important technology for several applications of video surveillance, robot vision and human interface. Key features of the person tracking are the shape and color. Especially, color information provides important information to distinguish individuals in scenes including multiple persons. However, color information is influenced by illumination color. In this paper, we propose a novel person tracking method based on color tracking with illumination color compensation. The illumination color is estimated from three statistical features obtained from the whole scene. The scene statistics are an average value, a maximum value and "gray-edge" value that means an average of edge component of the scene. Person is tracked as the concentration of registered colors by using the particle filter. In the proposed method, the positions and velocity of points are defined as a system model of the particle filter. Three likelihoods of each particle are calculated by colors compensated by three scene statistics. Then, the maximum likelihood of three likelihoods is selected as the likelihood of the particle. We conducted experiments for evaluation of the proposed method. The results showed the improvement of the accuracy of tracking in comparing with the previous method that compensated color by only average value of the scene.

关键词： Image color analysis Lighting Target tracking Particle filters Color Image sequences Clothing

来源：评论

学校读者我要写书评

暂无评论

Ultra-dense LEO: Integrating terrestrial-satellite networks into 5g and beyond for data offloading

arXiv

引用

arXiv 2018年

作者： Di, Boya Zhang, Hongliang Song, Lingyang Li, Yonghui Li, Geoffrey Ye State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China School of Electrical and Information Engineering University of Sydney School of Electrical and Computer Engineering Georgia Institute of Technology United States

In this paper, we propose a terrestrial-satellite network (TSN) architecture to integrate the ultradense low earth orbit (LEO) networks and the terrestrial networks to achieve efficient data offloading. In TSN, each ground user can access the network over C-band via a macro cell, a traditional small cell, or a LEO-backhauled small cell (LSC). Each LSC is then scheduled to upload the received data via multiple satellites over Ka-band. We aim to maximize the sum data rate and the number of accessed users while satisfying the varying backhaul capacity constraints jointly determined by the LEO satellite based backhaul links. The optimization problem is then decomposed into two closely connected subproblems and solved by our proposed matching algorithms. Simulation results show that the integrated network significantly outperforms the non-integrated ones in terms of the sum data rate. The influence of the traffic load and LEO constellation on the system performance is also discussed. Copyright © 2018, The Authors. All rights reserved.

关键词： Orbits

来源：评论

学校读者我要写书评

暂无评论

Comparison of Laguerre-Gaussian, Hermite–Gaussian and linearly polarized modes in SDM over FMF with electrical nonlinear equalizer

引用

AIP Conference Proceedings 2020年第1期2203卷

作者： Alaa Fareed Alaan Ghazi Aras Al-Dawoodi S. A. Aljunid Syed Zulkarnain Syed Idrus C. B. M. Rashidi Angela Amphawan Ahmed M. Fakhrudeen Ibrahim Eskandar Ibrahim Fadhel 1School of Computing Universiti Utara Malaysia Malaysia 2School of Human Development & Techno-communication Universiti Malaysia Perlis Malaysia 3School of Computer and Communication Engineering Universiti Malaysia Perlis Malaysia 4Computer Science Department College of Computer Science and Information Technology Kirkuk University Iraq 5Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts USA 6Networks Department College of Computer Science and Information Technology Kirkuk University Iraq 7Department of Computer and Information Systems National Institute of Administrative Science Yemen

The development of communication technologies shows that fiber optics is in the main communication improvement in the last decade. Fiber optics is moved from laboratory to be a reality. Transmission of the data using the light as a signal carrier is a revolutionary improvement in the communication era. However, to enable this technology several obstacles should be addressed, such as achieving the longest distance transmission with less possible bit error rate (BER). One of the solutions was performed by careful selection of the optical modes profiles with the help of the nonlinear electrical equalizer (NLEE) to solve the problem of the mode coupling. This paper investigates on the compensation of different modes profiles in optical communication systems over few-mode fiber (FMF) based on Space Division Multiplexer (SDM) with an electrical non-linear equalizer utilized to equalize nonlinear distortions. The result shows that the LG mode achieved the best transmission distance comparing to the other modes which make it the best option to be used. Basically, the evaluation of the system has been done based on standard evaluation metrics such as BER and Eye Diagram. These results can optimize the data transmission quality.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：