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Impacts of high frequency, high di/dT, dV/dT environment on sensing quality of GaN based converters and their mitigation

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CPSS Transactions on Power Electronics and Applications 2018年第4期3卷 301-312页

作者： Liu, Bo Ren, Ren Zhang, Zheyu Guo, Ben Wang, Fei Costinett, Daniel Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States GE Global Research Center NiskayunaNY12309 United States United Technologies Research Center East HartfordCT06108 United States Center for Ultra-Wide-Area Resilient Electric Energy Transmission Networks Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States Oak Ridge National Laboratory Oak RidgeTN37830 United States

A systematic study on a gallium nitride (GaN) high-electron-mobility transistor (HEMT) based battery charger, consisting of a Vienna-type rectifier plus a dc-dc converter, reveals a common phenomenon. That is, the high switching frequency, and high di/ dt and dv/dt noise inside GaN converters may induce a dc drift or low frequency distortion on sensing signals. The distortion mechanisms for different types of sensing errors are identified and practical minimization techniques are developed. Experimental results on the charger system have validated these mechanisms and corresponding approaches, showing an overall reduction of input current total harmonic distortion (THD) by up to 5 percentage points and improved dc-dc output voltage regulation accuracy. The knowledge helps engineers tackle the troublesome issues related to noise. © 2018 IEEE. All rights reserved.

关键词： Gallium nitride

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Hi-Fi: Hierarchical feature integration for skeleton detection

arXiv

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arXiv 2018年

作者： Zhao, Kai Shen, Wei Gao, Shanghua Li, Dandan Cheng, Ming-Ming College of Computer and Control Engineering Nankai University Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University

In natural images, the scales (thickness) of object skeletons may dramatically vary among objects and object parts, making object skeleton detection a challenging problem. We present a new convolutional neural network (CNN) architecture by introducing a novel hierarchical feature integration mechanism, named Hi-Fi, to address the skeleton detection problem. The proposed CNN-based approach has a powerful multi-scale feature integration ability that intrinsically captures high-level semantics from deeper layers as well as low-level details from shallower layers. By hierarchically integrating different CNN feature levels with bidirectional guidance, our approach (1) enables mutual refinement across features of different levels, and (2) possesses the strong ability to capture both rich object context and high-resolution details. Experimental results show that our method significantly outperforms the state-of-the-art methods in terms of effectively fusing features from very different scales, as evidenced by a considerable performance improvement on several benchmarks. Code is available at http://***/hifi. Copyright © 2018, The Authors. All rights reserved.

关键词： Musculoskeletal system

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Impartial SWIPT-assisted user cooperation schemes

arXiv

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arXiv 2019年

作者： Chen, Weiyu Ding, Haiyang Wang, Shilian da Costa, Daniel Benevides Gong, Fengkui College of Electronic Science and Technology National University of Defense technology Changsha China College of Information and Communication National University of Defense Technology Xi'an China Department of Computer Engineering Federal University of Ceará Sobral CE Brazil State Key Laboratory of Integrated Service Networks Xidian University Xi'an China

In this paper, we propose an impartial simultaneous wireless information and power transfer (SWIPT)assisted cooperation mechanism for a non-orthogonal multiple access (NOMA) downlink scenario. Specifically, both a cell-center user and a cell-edge user apply the power-splitting technique and utilize the harvested energy to forward the other user's information on the premise of successful decoding of their own information. Both analytical and numerical results show that the proposed impartial user cooperation mechanism (IUCM) outperforms the traditional partial cooperation mechanism in terms of outage probability, diversity order and diversity-multiplexing trade-off (DMT). For comparison, we further incorporate the IUCM into an orthogonal frequency-division multiple access (OFDMA) framework, which is shown to preserve the same diversity order, while has a worse but more flexible DMT performance in comparison with the IUCM in the NOMA framework. Although the IUCM in OFDMA has a worse outage performance, it is proved that it has the same optimal system outage probability with the IUCM in NOMA when the relaying channel between the two users is error-free. Copyright © 2019, The Authors. All rights reserved.

关键词： Orthogonal frequency division multiplexing

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Network Resiliency Against Earthquakes

Network Resiliency Against Earthquakes

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International Workshop on Reliable networks Design and Modeling (RNDM)

作者： Alessandro Valentini Balázs Vass Jorik Oostenbrink Levente Csák Fernando Kuipers Bruno Pace David Hay János Tapolcai University of Study “G.d'Annunzio” of Chieti-Pescara Chieti Italy MTA-BME Future Internet Research Group High-Speed Networks Laboratory (HSNLab) Budapest University of Technology and Economics Delft University of Technology Delft the Netherlands School of Engineering and Computer Science Hebrew University Jerusalem Israel

Guaranteeing a high availability of network services is a crucial part of network management. In this study, we show how to compute the availability of network services under earthquakes, by using empirical data. We take a multi-disciplinary approach and create an earthquake model based on seismological research and historical data. We then show how to integrate this empirical disaster model into existing network resiliency models to obtain the vulnerability and availability of a network under earthquakes. While previous studies have applied their models to ground shaking hazard models or earthquake scenarios, we compute (1) earthquake activity rates and (2) a relation between magnitude and disaster area, and use both as input data for our modeling. This approach is more in line with existing network resiliency models: it provides better information on the correlation between link failures than ground shaking hazard models and a more comprehensive view than a fixed set of scenarios.

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Direct detection optical transmission systems employing Stokes vector Kramers Kronig transceivers

Direct detection optical transmission systems employing Stok...

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Signal Processing in Photonic Communications, SPPCom 2018

作者： Hoang, Thang Zhuge, Q. Xing, Z. Sowailem, M. Morsy-Osman, M. Xiang, M. El-Fiky, E. Fan, S. Plant, D.V. Electrical and Computer Engineering Department McGill University 3480 University Street MontrealQCH3A 0E9 Canada State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Eletrical Engineering Department Alexandria University 21544 Egypt

We use a Stokes vector receiver to demonstrate polarization multiplexing Kramers Kronig detection signals. The impact of several parameters is discussed. 480-Gb/s capacity is achieved for 80 km of standard single mode... 详细信息

ISBN: (纸本)9781943580439

关键词： Light transmission

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Ge-on-Si modulators operating at mid-infrared wavelengths up to 8 μm

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Photonics Research 2019年第8期7卷 828-836页

作者： TIANTIAN LI MILOS NEDELJKOVIC NANNICHA HATTASAN WEI CAO ZHIBO QU CALLUM GLITTLEJOHNS JORDI SOLER PENADES LORENZO MASTRONARDI VINITA MITTAL DANIEL BENEDIKOVIC DAVID JTHOMSON FREDERIC YGARDES HEQUAN WU ZHIPING ZHOU GORAN ZMASHANOVICH Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing100871China Silicon Technologies Centre of Excellence Nanyang Technological UniversitySingapore639798Singapore Centre de Nanosciences et de Nanotechnologies CNRSUniv.Paris-SudUniversitéParis-SaclayC2N-Palaiseau91120PalaiseauFrance

We report mid-infrared Ge-on-Si waveguide-based PIN diode modulators operating at wavelengths of 3.8 and8 μm. Fabricated 1-mm-long electro-absorption devices exhibit a modulation depth of >35 dB with a 7 V forward bias at 3.8 μm, and a similar 1-mm-long Mach–Zehnder modulator has a Vπ· L of 0.47 V · cm. Driven by a 2.5 Vpp RF signal, 60 MHz on-off keying modulation was demonstrated. Electro-absorption modulation at 8 μm was demonstrated preliminarily, with the device performance limited by large contact separation and high contact resistance.

关键词： PIN frame EAM Ge-on-Si modulators

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

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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

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Resource allocation for 5G heterogeneous cloud radio access networks with D2D communication: A matching and coalition approach

Resource allocation for 5G heterogeneous cloud radio access ...

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作者： Zhang, Biling Mao, Xingwang Yu, Jung-Lang Han, Zhu School of Network Education Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Integrated Services Networks Xidian University Xi'an710071 China Department of Electrical Engineering Fu Jen Catholic University New Taipei City24205 Taiwan Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul Korea Republic of

Device-to-Device (D2D) communication is a promising technology toward the fifth generation mobile communication. However, when D2D communication is incorporated into heterogeneous cloud radio access network (H-CRAN), the interference management between the D2D users and current users is a challenge. In this paper, we study how to assign the sub-channels of different bandwidth to multiple D2D pairs and the remote radio head users. In such a way, the sub-channels that have been pre-allocated to macro-cell users can be reused, the system performance can be maximized while the quality of service of all users can be guaranteed. Such a resource allocation problem is formulated as a mixed integer nonlinear programming (MINLP) problem which is NP-hard. To obtain the solution, the proposed problem is reformulated into a many-to-one matching sub-game with externality followed by a coalition sub-game. Then, a constrained deferred acceptance algorithm and a coalition formation algorithm are proposed to find solutions to these two sequential sub-games, respectively. Finally, we prove theoretically that both the proposed algorithms can convergent with a low computational complexity. Numerical results demonstrate that compared with existing resource allocation schemes, our proposed scheme can significantly improve the system performance in terms of overall throughput, the total number of admitted users and fairness. © 1967-2012 IEEE.

关键词： Resource allocation

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Driving Android apps to trigger target API invocations based on activity and GUI filtering

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Science China(Information Sciences) 2017年第7期60卷 262-264页

作者： Hongzhou YUE Yuqing ZHANG Wenjie WANG Qixu LIU State Key Laboratory of Integrated Services Networks Xidian University National Computer Network Intrusion Protection Center University of Chinese Academy of Sciences State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences

For an Android app tester,it is often needed to trigger the specific behaviors of an ***,most of the existing Android GUI exploration tools only pursue high code coverage,rather than triggering the specific behaviors of an app[1,2].It inevitably leads to the unnecessary time consumption in the exploration process of an app if the testers only care about some specific behaviors of this ***,methods of making a more targeted GUI exploration tool had been studied by

关键词： GUI API Driving Android apps to trigger target API invocations based on activity and GUI filtering

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Energy Efficient Power Allocation for Relay-Aided D2D Communications in 5G networks

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China Communications 2017年第6期14卷 54-64页

作者： Ru Wang Jia Liu Guopeng Zhang Shuanghong Huang Ming Yuan State Key Laboratory of Integrated Services Networks Xidian University Department of Computer Science and Engineering Huaihua University School of Computer Science and Technology China University of Mining and Technology Wireless Advanced Research Department ZTE Corporation

As one of the key technologies for the fifth generation(5G) wireless networks,device-to-device(D2D) communications allow user equipment(UE) in close proximity to communicate with each other *** by a relay,the relay-aided D2D(RA-D2D) communications can not only be applied to communications in much longer distance but also achieve a high quality of service(Qo S) .In this paper,we first propose a two-layer system model allowing RA-D2 D links to underlay traditional cellular *** we maximize the energy efficiency of the RA-D2 D link while satisfying the minimum data-rate of the cellular *** optimal transmit power at both D2 D transmitter and D2 D relay sides is obtained by transforming the nonlinear fractional programming into a nonlinear parameter *** results show that our proposed power allocation method is more energy efficient than the existing works,and the proposed RA-D2 D scheme outperformed direct D2 D scheme when the distance between two D2 D users is longer.

关键词： D2D communication relay-aided underlay green communication energy efficiency power allocation

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