检索结果-内蒙古大学图书馆

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

Receive buffer pre-division based flow control for MPTCP 1

引用

13th International Conference on Mobile Ad-hoc and Sensor networks, MSN 2017

作者： Han, Jiangping Xue, Kaiping Yue, Hao Hong, Peilin Yu, Nenghai Li, Fenghua Department of EEIS University of Science and Technology of China HefeiAnhui230027 China Science and Technology on Communication Networks Laboratory ShijiazhuangHebei050081 China Department of Computer Science San Francisco State University San FranciscoCA94132 United States State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China

ISBN: (数字)9789811088902

ISBN: (纸本)9789811088896

Multipath TCP (MPTCP) enables terminals utilizing multiple interfaces for data transmission simultaneously, which provides better performance and brings many benefits. However, using multiple paths brings some new challenges. The asymmetric parameters among different subflows may cause the out-of-order problem and load imbalance problem, especially in wireless network which has more packet loss. Thus it will significantly degrade the performance of MPTCP. In this paper, we propose a Receive Buffer Pre-division based flow control mechanism (RBP) for MPTCP. RBP divides receive buffer according to the prediction of receive buffer occupancy of each subflow, and controls the data transmission on each subflow using the divided buffer and the number of out-of-order packets, which can significantly improve the performance of MPTCP. We use the NS-3 simulations to verify the performance of our scheme, and the simulation results show that RBP algorithm can significantly increase the global throughput of MPTCP. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Flow control

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

Evolutionary Cryptography Theory-Based Generating Method for Secure ECs

引用

Tsinghua Science and Technology 2017年第5期22卷 499-510页

作者： Chao Wang Feng Hu Huanguo Zhang Jie Wu the Key Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information EngineeringShanghai University the Department of Computer and Information Sciences Temple University the Key Lab of Aerospace Information Security and Trusted Computing Wuhan University

Ant Colony Optimization （AGO） has the character of positive feedback, distributed searching, and greedy searching. It is applicable to optimization grouping problems. Traditional cryptographic research is mainly based on pure mathematical methods which have complicated theories and algorithm. It seems that there is no relationship between cryptography and ACO. Actually, some problems in cryptography are due to optimization grouping problems that could be improved using an evolutionary algorithm. Therefore, this paper presents a new method of solving secure curve selection problems using ACO. We improved Complex Multiplication （CM） by combining Evolutionary Cryptography Theory with Weber polynomial solutions. We found that ACO makes full use of valid information generated from factorization and allocates computing resource reasonably. It greatly increases the performance of Weber polynomial solutions. Compared with traditional CM, which can only search one root once time, our new method searches all roots of the polynomial once, and the average time needed to search for one root reduces rapidly. The more roots are searched, the more ECs are obtained.

关键词： ECs Weber polynomial evolutionary algorithm ant algorithm complex multiplication

来源：评论

学校读者我要写书评

暂无评论

A Pan-sharpening Method for Multispectral Image with Back Propagation Neural Network and Its Parallel Optimization Based on Spark 5

A Pan-sharpening Method for Multispectral Image with Back Pr...

引用

2017 International Conference on Progress in Informatics and Computing(PIC)

作者： Zhongzheng Ding Zebin Wu Wei Huang Xianliang Yin Jin Sun Yi Zhang Zhihui Wei Yan Zhang School of Computer Science and Engineering Nanjing University of Science and Technology Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks

ISBN: (纸本)9781538619797;9781538619780

The Pan-sharpening method,which is used to address the fusion problem of multispectral(MS) images and panchromatic(PAN) images,has continuously been a hot spot in image fusion *** order to improve the quality and accuracy of the fused image,this paper proposes a Pansharpening method for MS image based on Back Propagation(BP)neural network,and further uses the Spark platform and the TensorFlowOnSpark(TFOS) framework to optimize the BP neural *** experimental results show that the proposed method effectively enhances the quality of the fused image,and the parallel optimization method for BP neural network based on Spark improves the computational efficiency while ensuring the fusion accuracy.

关键词： Pan-sharpening Back Propagation neural network TensorFlowOnSpark

来源：评论

学校读者我要写书评

暂无评论

Simple Method for Realizing Weil Theorem in Secure ECC Generation

引用

Tsinghua Science and Technology 2017年第5期22卷 511-519页

作者： Feng Hu Chao Wang Huanguo Zhang Jie Wu the Key Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information EngineeringShanghai University the Department of Computer and Information Sciences Temple University the Key Lab of Aerospace Information Security and Trusted Computing Wuhan University

How to quickly compute the number of points on an Elliptic Curve （EC） has been a longstanding challenge. The computational complexity of the algorithm usually employed makes it highly inefficient. Unlike the general EC, a simple method called the Weil theorem can be used to compute the order of an EC characterized by a small prime number, such as the Kobltiz EC characterized by two. The fifteen secure ECs recommended by the National Institute of Standards and Technology （NIST） Digital Signature Standard contain five Koblitz ECs whose maximum base domain reaches 571 bits. Experimental results show that the computation speed decreases for base domains exceeding 600 bits. In this paper, we propose a simple method that combines the Weil theorem with Pascals triangle, which greatly reduces the computational complexity. We have validated the performance of this method for base fields ranging from 2l^100 to 2^1000. Furthermore, this new method can be generalized to any ECs characterized by any small prime number.

关键词： Elliptic Curves （ECs） Pascal＇s triangle Weil theorem

来源：评论

学校读者我要写书评

暂无评论

Optimal Spectrum Sensing-Access Policy in Energy Harvesting Cognitive Radio Sensor networks

引用

Procedia computer Science 2018年 129卷 194-200页

作者： Fan Zhang Tao Jing Yan Huo Liran Ma School of Electronics and Information Engineering Beijing Jiaotong University Beijing China Science and Technology on Communication Networks Laboratory Beijing China Department of Computer Science Texas Christian University Fort Worth TX USA

In this paper, we introduce energy harvesting into a cognitive radio sensor network to power the network with renewable energy sources so as to achieve self-sustainability of energy-limited sensors. In our work, the cognitive radio technology enable sensors access to the underutilized spectrum for the purpose of coping with the spectrum-scarcity problem in the unlicensed band. Using centralized cooperative spectrum sensing, a set of cognitive sensors is chosen from candidate sensors with different received primary users’ signal powers and energy-arrival rates. After detecting the state of a primary channel, we also need to determine which cognitive sensor can get to access the primary channel as well as the power level to be used upon the transmission. The above sensing-access design problem is formulated as an infinite-horizon partially observable Markov decision process, in which the primary goal is to maximize the long-term expected throughput. Through using a value iteration approach, we propose an optimal sensing-access policy. At last, numerical results are presented to verify the superiority of our proposed policy to the existing policy.

关键词： Energy harvesting cognitive radio sensor networks cooperative sensing partially observable Markov decision process

来源：评论

学校读者我要写书评

暂无评论

All-Dielectric Transformed Material for Microwave Broadband Orbital Angular Momentum Vortex Beam

引用

Physical Review Applied 2019年第2期12卷 024064-024064页

作者： Jianjia Yi Xueqi Cao Rui Feng Badreddine Ratni Zhihao Jiang Danny Zhu Lina Zhu André de Lustrac Douglas H. Werner Shah Nawaz Burokur Key Laboratory of Integrated Services Networks Xidian University No. 2 South Taibai Road Xi’an 710071 Shaanxi China Centre de Nanosciences et de Nanotechnologies CNRS Université Paris-Saclay 10 Boulevard Thomas Gobert 91120 Palaiseau France LEME Université Paris Nanterre 92410 Ville d’Avray France State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 Jiangsu China Department of Electrical Engineering and Computer Science U.S. Military Academy West Point New York 10996 USA Department of Electrical Engineering The Pennsylvania State University University Park Pennsylvania 16802 USA

Electromagnetic waves exhibiting vortex properties from orbital angular momentum (OAM) modes that are inherently orthogonal show promising potential for a wide range of applications. However, classic OAM-wave generators in the radio-frequency band are generally limited by a narrow operation bandwidth, complicated feeding structures, or high losses. In this work, we propose a method for OAM-wave generation using the concept of spatial transformation at microwave frequencies. A reflection-type vortex-beam generator is designed and simulated. Then an all-dielectric proof-of-concept prototype for a +1 topological charge is physically implemented and the complete characterization of the device is reported. Both full-wave simulations and experimental measurements successfully validate the spiral-shaped phase fronts of the vortex wave. Furthermore, the all-dielectric implementation of the device enables operation over a broad frequency bandwidth. The proposed method provides an efficient approach to generate vortex waves carrying OAM modes and illustrates the practicality of using spatial transformations to achieve an alternative class of optical devices at microwave frequencies.

关键词： Angular momentum of light Beam optics Metamaterials Optical vortices Photonics Ultrathin films Methods in electromagnetism Microwave techniques

来源：评论

学校读者我要写书评

暂无评论

UbiEar: Bringing location-independent sound awareness to the hard-of-hearing people with smartphones

引用

Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 2017年第2期1卷 1–21页

作者： Sicong, L.I.U. Zhou, Zimu Junzhao, D.U. Shangguan, Longfei Han, Jun Wang, Xin School of Computer Science and Technology Xidian University China Computer Engineering and Networks Laboratory ETH Zurich Switzerland School of Computer Science and Technology School of Software and Institute of Software Engineering Xidian University China Department of Computer Science Princeton University United States School of Software and Institute of Software Engineering Xidian University China

Non-speech sound-awareness is important to improve the quality of life for the deaf and hard-of-hearing (DHH) people. DHH people, especially the young, are not always satisfied with their hearing aids. According to the interviews with 60 young hard-of-hearing students, a ubiquitous sound-awareness tool for emergency and social events that works in diverse environments is desired. In this paper, we design UbiEar, a smartphone-based acoustic event sensing and notification system. Core techniques in UbiEar are a light-weight deep convolution neural network to enable location-independent acoustic event recognition on commodity smartphons, and a set of mechanisms for prompt and energy-efficient acoustic sensing. We conducted both controlled experiments and user studies with 86 DHH students and showed that UbiEar can assist the young DHH students in awareness of important acoustic events in their daily life. © 2017 Copyright held by the owner/author(s). Publication rights licensed to Association for Computing Machinery.

关键词： Students

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

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：