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| 1 | Retransmission or redundancy:Transmission reliability study in wireless sensor networks显示文摘As an application-driven network,wireless sensor network generally requires data reliability to maintain detection and response capabilities.Although two approaches,namely,retransmission and redundancy,have been proposed to enhance data reliability,the theoretical work is required to evaluate their impact on transmission reliability and energy efficiency.In this paper,we offer a comprehensive theoretical study on packet arrival probability and average energy consumption for both approaches.Our analysis and simulations indicate that when loss probabilities remain low or moderate,erasure coding,a typical redundancy-based scheme,is more energy efficient than retransmission.We also demonstrate that the resistance capability of erasure coding against packet loss weakens as the hop number increases,which motivates us to propose two improved mechanism based on the idea of the loss detection and the loss recovery.Finally,the simulation results carried out using TOSSIM verify the performance of different mechanisms both in the chain topology and the tree topology. | WEN Hao LIN Chuang REN FengYuan ZHOU Jia YUE Yao HUANG XiaoMeng | 2012 | Science China(Information Sciences)2012，55，4： | 7 |
| 2 | Geographic modeling and simulation systems for geographic research in the new era: Some thoughts on their development and construction显示文摘Regionality,comprehensiveness,and complexity are regarded as the basic characteristics of geography.The exploration of their core connotations is an essential way to achieve breakthroughs in geography in the new era.This paper focuses on the important method in geographic research:Geographic modeling and simulation.First,we clarify the research requirements of the said three characteristics of geography and its potential to address geo-problems in the new era.Then,the supporting capabilities of the existing geographic modeling and simulation systems for geographic research are summarized from three perspectives:Model resources,modeling processes,and operational architecture.Finally,we discern avenues for future research of geographic modeling and simulation systems for the study of regional,comprehensive and complex characteristics of geography.Based on these analyses,we propose implementation architecture of geographic modeling and simulation systems and discuss the module composition and functional realization,which could provide theoretical and technical support for geographic modeling and simulation systems to better serve the development of geography in the new era. | Min CHEN Guonian LV Chenghu ZHOU Hui LIN Zaiyang MA Songshan YUE Yongning WEN Fengyuan ZHANG Jin WANG Zhiyi ZHU Kai XU Yuanqing HE | 2021 | Science China Earth Sciences2021，64，8： | 3 |
| 3 | Speed up the Responsibility of Active Queue Management System显示文摘 | Ren Fengyuan Lin Chuang | 2003 | Special on Internet technology Ⅲ IEICE Trans on Communications2003，86，2： | 1 |
| 4 | Wireless Sensor Networks显示文摘 | Ren Fengyuan Huang Haining Lin Chuang | 2003 | Journal of Software2003，14，2： | 1 |
| 5 | Speed up the responsiveness of active queue management system 显示文摘 | Ren Fengyuan Lin Chuang | 2003 | IEICE Transactions on Communication2003，86，2： | 1 |
| 6 | Geographic information science in the era of geospatial big data: A cyberspace perspective显示文摘The advent of information and communication technology and the Internet of Things have led our society toward a digital era.The proliferation of personal computers,smartphones,intelligent autonomous sensors,and pervasive network interactions with individuals have gradually shifted human activities from offline to online and from in person to virtual.This transformation has brought a series of challenges in a variety of fields,such as the dilemma of placelessness,some aspects of timelessness(no time relevance),and the changing relevance of distance in the field of geographic information science(GIScience).In the last two decades,“cyber thinking”in GIScience has received significant attention from different perspectives.For instance,human activities in“cyberspace”need to be reconsidered when coupled with the geographic space to observe the first law of geography. | Xintao Liu Min Chen Christophe Claramunt Michael Batty Mei-Po Kwan Ahmad MSenousi Tao Cheng Josef Strobl Arzu Cöltekin John Wilson Temenoujka Bandrova Milan Konecny Paul MTorrens Fengyuan Zhang Li He Jinfeng Wang Carlo Ratti Olaf Kolditz Alexander Klippel Songnian Li Hui Lin Guonian Lu | 2022 | The Innovation2022，3，5： | 1 |
| 7 | A robust active queue management algorithm in large delay networks 显示文摘 | Fengyuan Ren Chuang Lin Bo Wei | 2005 | Computer Communications2005，28，5： | 1 |
| 8 | Wire- less sensor network显示文摘 | Ren Fengyuan Huang Haining Lin Chuang | 2003 | Journal of Software2003，14，2： | 1 |
| 9 | Speed up the Responsibility of Active Queue Management System显示文摘 | Ren Fengyuan Lin Chuang | 2003 | Special on Interact technology Ⅲ IEICE Trans on Communications2003，86，2： | 1 |
| 10 | A novel high speed transport protocol based on explicit virtual load feedback显示文摘 | Huang Xiaomeng Lin Chuang Ren Fengyuan | 2007 | Computer Networks2007，51，7： | 1 |
| 11 | Design a congestion controller based on sliding mode variable structure control显示文摘 | Ren Fengyuan Lin Chuang Yin Xunhe | 2005 | Computer Communications2005，28，9： | 1 |
| 12 | Speed up the responsiveness ofactive queue management system 显示文摘 | Ren Fengyuan Lin Chuang | 2003 | IEICE Transactions on Communication2003，86，2： | 1 |
| 13 | Perovskite/GaAs-nanowire hybrid structure photodetectors with ultrafast multiband response enhancement by band engineering显示文摘We developed a hybrid structure photodetector combining one-dimensional(1D)inorganic GaAs nanowires and two-dimensional(2D)organic perovskite materials,which can achieve various performance enhancements using a relatively simple structure.Via the optical absorption enhancement of perovskite and the type-II energy band structure formed by the heterostructure,the responsivity and detectivity of the photodetector from ultraviolet(UV)to visible(Vis)wavelengths are significantly enhanced,reaching 75 A/W and 1.49×10^(11)Jones,respectively.The response time of the photodetector was significantly decreased by 3 orders,from 785 ms to 0.5 ms,and the dark current was further reduced to 237 fA.A photodetector was prepared with enhanced responsivity and ultrafast response time in the multiband region from the UV to Vis wavelength.To the best of our knowledge,this is the first time to combine inorganicⅢ-ⅤGaAs nanomaterials with organic perovskite materials,which verifies the effective combination of inorganic and organic materials in a mixed dimension.The excellent photoelectric performance of the perovskite/GaAs-nanowire hybrid structure photodetector makes it a potential candidate material for a wide range of photoelectric applications such as multiband photodetection. | XIAOBING HOU XITONG HONG FENGYUAN LIN JINZHI CUI QIAN DAI QIANLEI TIAN BINGHENG MENG YANJUN LIU JILONG TANG KEXUE LI LEI LIAO ZHIPENG WEI | 2023 | Photonics Research2023，11，4： | 0 |
| 14 | Differential immune responses in pregnant patients recovered from COYID-19显示文摘Pregnant women are generally more susceptible to viral infection.Although the impact of SARS-CoV-2 in pregnancy remains to be determined,evidence indicates that the risk factors for severe COVID-19 are similar in pregnancy to the general population.Here we systemically analyzed the clinical characteristics of pregnant and non-pregnant female COVID-19 patients who were hospitalized during the same period and found that pregnant patients developed marked lymphopenia and higher inflammation evident by higher C-reactive protein and IL-6.To elucidate the pathways that might contribute to immunopathology or protective immunity against COVID-19 during pregnancy,we applied single-cell mRNA sequencing to profile peripheral blood mononuclear cells from four pregnant and six non-pregnant female patients after recovery along with four pregnant and three non-pregnant healthy donors.We found normal clonal expansion of T cells in the pregnant patients,heightened activation and chemotaxis in NK,NKT,and MAIT cells,and differential interferon responses in the monocyte compartment.Our data present a unique feature in both innate and adaptive immune responses in pregnant patients recovered from COVID-19. | Ge Chen Yiming Zhang Yaoyao Zhang Jihui Ai Bin Yang Mengge Cui Qiuyue Liao Hanxiao Chen Hualin Bai Dashing Shang Jing Chen ChaoYang Sun Haiyi Liu Fengyuan Liu Bin Mao Guoqiang Sun Lu Chen Jing-wen Lin Kezhen Li | 2021 | Signal Transduction and Targeted Therapy2021，6，8： | 0 |
| 15 | Angle-selective perfect absorption with two-dimensional materials显示文摘Two-dimensional(2D)materials have great potential in photonic and optoelectronic devices.However,the relatively weak light absorption in 2D materials hinders their application in practical devices.Here,we propose a general approach to achieve angleselective perfect light absorption in 2D materials.As a demonstration of the concept,we experimentally show giant light absorption by placing large-area single-layer graphene on a structure consisting of a chalcogenide layer atop a mirror and achieving a total absorption of 77.6%in the mid-infrared wavelength range(~13μm),where the graphene contributes a record-high 47.2%absorptivity of mid-infrared light.Construction of such an angle-selective thin optical element is important for solar and thermal energy harvesting,photo-detection and sensing applications.Our study points to a new opportunity to combine 2D materials with photonic structures to enable novel device applications. | Linxiao Zhu Fengyuan Liu Hongtao Lin Juejun Hu Zongfu Yu Xinran Wang Shanhui Fan | 2015 | Light(Science & Applications)2015，4，1： | 0 |
| 16 | Design and analysis of an ONOFF variable structure controller for AQM routers supporting TCP flows显示文摘Active queue management(AQM) can maintain smaller queuing delay and higher throughput by purposefully dropping packets at intermediate nodes. Most of the existing AQM schemes follow the probability dropping mechanism originating from random early detection(RED) . This paper develops a novel packet dropping mechanism for AQM through designing an ONOFF controller applying the variable structure control theory. Because the binary ONOFF controller can considerably simplify the manipulation on the AQM router,it is helpful for implementing the high performance router. The design principles of ONOFF controller are discussed in detail. The guidelines towards parameter settings are presented. The performance is extensively evaluated and compared with other well-known controllers through simulations and theoretical analysis. The results demonstrate that the ONOFF controller is responsive and robust against external disturbances,and is insensitive to variances of the system parameters. Therefore,it is very suitable for the time-varying network system,and at the same time,it can also keep the instantaneous queue length at a desired level with rather small oscillations,which is conducive to achieving the technical objectives of AQM. | REN FengYuan YIN YunHe LIN Chuang | 2008 | Science in China(Series F)2008，51，11： | 0 |
| 17 | Development and test in grid of 630 kVA three-phase high temperature superconducting transformer显示文摘A 630-kVA 10.5 kV/0.4 kV three-phase high temperature superconducting(HTS)power transformer was successfully developed and tested in a live grid.The windings were wound by hermetic stainless steelreinforced multi-filamentary Bi2223/Ag tapes.The structures of primary windings are solenoid with insulation and cooling path among layers,and those of secondary windings consist of double-pancakes connected in parallel.Toroidal cryostat is made from electrical insulating glass fiber reinforced plastics(GFRP)materials with room temperature bore for commercial amorphous alloy core with five limbs.Windings are laid in the toroidal cryostat so that the amorphous core operates at room temperature.An insulation technology of double-half wrapping up the Bi2223/Ag tape with Kapton film is used by a winding machine developed by the authors.Fundamental characteristics of the transformer are obtained by standard short-circuit and no-load tests,and it is shown that the transformer meets operating requirements in a live grid. | Yinshun WANG Xiang ZHAO Junjie HAN Huidong LI Yin GUAN Qing BAO Xi XU Shaotao DAI Naihao SONG Fengyuan ZHANG Liangzhen LIN Liye XIAO | 2009 | Frontiers of Electrical and Electronic Engineering in China2009，4，1： | 0 |
| 18 | Directional emissions from perovskite nanocrystals thin film enabled by metasurface integration through one step spin-coating process显示文摘Advances in thin film light-emitting devices have fueled the rapid growth of a new class of solid-state lighting devices,featuring low fabrication cost,high quantum efficiency,broadband spectrum coverage,etc.In contrast to the conventional inorganic semiconductors that rely on lattice matched high crystalline quality substrate,solution processable thin films eliminate the dependence on the substrate,which is highly desired for the ease and versatility of integrations with foreign medium.By taking this advantage,this work developed an ultracompact solution to control the directionality of thin film emitters using integrated dielectric metasurface through one step spin-coating process.As a proof of concept,directional emissions from perovskite nanocrystal thin film,including collimated light emissions and two-dimensional beam steering,are experimentally demonstrated.Notably,our approach,where light emitters were integrated on the back side of substrate after the fabrication of metasurface,judiciously avoids any potential degradation of material optical quality caused by the multi-step nanofabrication.Therefore,it can serve as a generalized scheme to engage the advantageous properties of dielectric metasurface,including the compactness,high efficiency,beam controllability with the emerging thin film light-emitting diodes(LEDs),which is applicable to a wide range of solution processable materials,including organic light-emitting diodes,quantum-dot light emitting diodes,polymer LEDs,and perovskite LEDs,opening up new pathways to develop low-cost and ultra-compact solid state light sources with versatile beams characteristics. | Kexue Li Xuanyu Zhang Peinan Ni Juncheng Liu Fengyuan Lin Xu Man Wenfeng Cai Jianxun Liu Yanjun Liu Rui Chen Zhipeng Wei | 2023 | Nano Research2023，16，5： | 0 |
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