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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Wang, Yanxiang Chai, Furong Zhang, Qi Li, Yuanfeng Sun, Meng Sun, Dandan Tian, Feng Wang, Fu Wang, Yongjun Tian, Qinghua Yang, Leijing Beijing100876 China BUPT Beijing Key Laboratory of Space-ground Interconnection and Convergence Beijing100876 China National Univ. of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha410073 China

To address the offloading allocation problem for intensive tasks in Satellite Edge Computing (SEC) systems, a Sequence-to-Sequence (Seq2Seq) and Deep Reinforcement Learning (DRL) based decision generation algorithm, e... 详细信息

ISBN: (纸本)9798350367652

关键词： Computation offloading

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Anisotropic phonon dynamics in Dirac semimetal PtTe2 thin films enabled by helicity-dependent ultrafast light excitation

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Light(science & Applications) 2024年第9期13卷 1888-1897页

作者： Ziyang Li Yequan Chen Anke Song Jinzhong Zhang Rong Zhang Zongzhi Zhang Xuefeng Wang Key Laboratory of Micro and Nano Photonic Structures(MOE) School of Information Science and TechnologyFudan UniversityShanghaiChina Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials State Key Laboratory of Spintronics Devices and TechnologiesSchool of Electronic Science and EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingChina Department of Physics School of Physics and Electronic ScienceEast China Normal UniversityShanghaiChina Department of Physics Xiamen UniversityXiamenChina

Coherent phonons have aroused considerable attention in condensed matter physics owing to their extraordinary capacity of reflecting and controlling the physical properties of ***,the investigation on the interaction between coherent phonons and other microscopic particles on the ultrafast timescale within topological systems continues to be an active and unresolved ***,we show the energy transfer of coherent optical phonons(COP)in Dirac semimetal PtTe2 thin films using ultrafast optical pump-probe ***,the helicitydependent light-driven anisotropic COP signals disclose their direct connection with the light-excited anisotropic spinpolarized electrons via an angular momentum ***,we observe the notable decreases in the COP oscillation frequency and the decay rate with increasing temperatures due to the anharmonic phonon-phonon scattering and electron-phonon scattering in the COP dissipation process,*** work paves the way for uncovering the coherent phonons in Dirac semimetals for the potential applications in optoelectronics and optospintronics.

关键词： spectroscopy phonon Dirac

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Cooperative Caching Strategy Based on Two-Layer Caching Model for Remote Sensing Satellite Networks

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Computers, Materials & Continua 2023年第5期75卷 3903-3922页

作者： Rui Xu Xiaoqiang Di Hao Luo Hui Qi Xiongwen He Wenping Lei School of Computer Science and Technology Changchun University of Science and TechnologyChangchun130022China School of Information Engineering Henan Institute of Science and TechnologyXinxiang453003China Jilin Province Key Laboratory of Network and Information Security Changchun University of Science and TechnologyChangchun130022China Information Center Changchun University of Science and TechnologyChangchun130022China Beijing Institute of Spacecraft System Engineering Beijing100094China Beijing Institute of Space Mechanic and Electricity Beijing100094China

In information Centric Networking(ICN)where content is the object of exchange,in-network caching is a unique functional feature with the ability to handle data storage and distribution in remote sensing satellite *** up cache space at any node enables users to access data nearby,thus relieving the processing pressure on the ***,the existing caching strategies still suffer from the lack of global planning of cache contents and low utilization of cache resources due to the lack of fine-grained division of cache *** address the issues mentioned,a cooperative caching strategy(CSTL)for remote sensing satellite networks based on a two-layer caching model is *** two-layer caching model is constructed by setting up separate cache spaces in the satellite network and the ground *** caching of popular contents in the region at the ground station to reduce the access delay of users.A content classification method based on hierarchical division is proposed in the satellite network,and differential probabilistic caching is employed for different levels of *** cached content is also dynamically adjusted by analyzing the subsequent changes in the popularity of the cached *** the two-layer caching model,ground stations and satellite networks collaboratively cache to achieve global planning of cache contents,rationalize the utilization of cache resources,and reduce the propagation delay of remote sensing *** results show that the CSTL strategy not only has a high cache hit ratio compared with other caching strategies but also effectively reduces user request delay and server load,which satisfies the timeliness requirement of remote sensing data transmission.

关键词： information centric networking caching strategy two-layer caching model hierarchical division

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Temperature characterizations of silica asymmetric Mach–Zehnder interferometer chip for quantum key distribution

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Chinese Physics B 2023年第1期32卷 183-189页

作者：吴丹李骁王亮亮张家顺陈巍王玥王红杰李建光尹小杰吴远大安俊明宋泽国 State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Laboratory of Quantum Information CASUniversity of Science and Technology of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Wuxi Institute of Interconnect Technology Co.Ltd.

Quantum key distribution(QKD)system based on passive silica planar lightwave circuit(PLC)asymmetric Mach–Zehnder interferometers(AMZI)is characterized with thermal stability,low loss and sufficient integration ***,waveguide stresses,both intrinsic and temperature-induced stresses,have significant impacts on the stable operation of the *** have designed silica AMZI chips of 400 ps delay,with bend waveguides length equalized for both long and short arms to balance the stresses *** temperature characteristics of the silica PLC AMZI chip are *** interference visibility at the single photon level is kept higher than 95%over a wide temperature range of 12℃.The delay time change is 0.321 ps within a temperature change of 40℃.The spectral shift is 0.0011 nm/0.1℃.Temperature-induced delay time and peak wavelength variations do not affect the interference *** experiment results demonstrate the advantage of being tolerant to chip temperature fluctuations.

关键词： quantum key distribution planar lightwave circuit temperature characterization interference visibility

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Seastar: A Cache-Efficient and Load-Balanced key-Value Store on Disaggregated Memory

Seastar: A Cache-Efficient and Load-Balanced Key-Value Store...

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2024 IEEE International Conference on Cluster Computing, CLUSTER 2024

作者： Du, Jingwen Wang, Fang Feng, Dan Zeng, Dexin Yi, Sheng Engineering Research Center of Data Storage Systems and Technology Ministry of Education of China Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage System China School of Computer Science and Technology Huazhong University of Science and Technology China Shenzhen Huazhong University of Science and Technology Research Institute China

ISBN: (纸本)9798350358711

In modern datacenters, memory disaggregation un-packs monolithic servers to build independent network-connected compute and memory pools, greatly improving resource uti-lization. Existing memory-disaggregated key-value stores adopt ownership sharing or ownership partitioning for request scheduling and they all show poor performance and scalability. The former generates multiple cache misses and multiple network round trips due to poor cache locality, while the latter fails to fully use resources on all Compute Nodes (CNs) due to load imbalance. In this paper, we propose Seastar, a fast and scalable key-value store that achieves high cache locality as well as load balancing. To enable high concurrency and ensure linearizability, Seastar exploits a self-verification version chain to provide out-of-place atomic updates and ensure consistent reads. To improve cache locality, Seastar leverages a pair-based ownership assigning scheme to assign the processing permission of requests corre-sponding to each key to a CN pair through two independent hash functions. To ensure load balancing among CNs, Seastar proposes a decentralized power-of-two-choices routing scheme to route the requests to the less-loaded CNs in CN pairs for handling. Experimental results demonstrate that Seastar improves the throughput by up to 6.7x and significantly reduces the latency compared with state-of-the-art memory-disaggregated key-value stores. © 2024 IEEE.

关键词： Scalability

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Equalizer Zero-Determinant Strategy in Discounted Repeated Stackelberg Asymmetric Game

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Journal of systems science & Complexity 2024年第1期37卷 184-203页

作者： CHENG Zhaoyang CHEN Guanpu HONG Yiguang Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Electrical Engineering and Computer Science KTH Royal Institute of Technology10044 StockholmSweden. Department of Control Science and Engineering Tongji UniversityShanghai 201804China Shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 210201China

This paper focuses on the performance of equalizer zero-determinant(ZD)strategies in discounted repeated Stackelberg asymmetric *** the leader-follower adversarial scenario,the strong Stackelberg equilibrium(SSE)deriving from the opponents’best response(BR),is technically the optimal strategy for the ***,computing an SSE strategy may be difficult since it needs to solve a mixed-integer program and has exponential complexity in the number of *** this end,the authors propose an equalizer ZD strategy,which can unilaterally restrict the opponent’s expected *** authors first study the existence of an equalizer ZD strategy with one-to-one situations,and analyze an upper bound of its performance with the baseline SSE *** the authors turn to multi-player models,where there exists one player adopting an equalizer ZD *** authors give bounds of the weighted sum of opponents’s utilities,and compare it with the SSE ***,the authors give simulations on unmanned aerial vehicles(UAVs)and the moving target defense(MTD)to verify the effectiveness of the proposed approach.

关键词： Discounted repeated Stackelberg asymmetric game equalizer zero-determinant strategy strong Stackelberg equilibrium strategy

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Analysis of Network Resilience for Logical-Physical Dual-Layer Networks in Configuring Backup Paths 9

Analysis of Network Resilience for Logical-Physical Dual-Lay...

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9th International Conference on Big Data and information Analytics, BigDIA 2023

作者： Li, Zhe Long, Zhitao Yu, Zhuoting Diao, Boyang Liu, Jin National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha China National University of Defense Technology College of Systems Engineering Changsha China

ISBN: (纸本)9798350330076

The logical-physical dual-layer network is standardized in this paper, and three attack modes-random attack, maximum betweenness attack, and minimum betweenness attack are used to simulate and analyze the network resilience of the logical-physical dual-layer network with backup path and without backup path. The variation curves of network load loss under various attack edges are derived through simulation analysis, and it is determined that setting up backup path can significantly increase network resilience. On the basis of this conclusion, the impact of different backup path stowage schemes on network resilience is further explored, and the network load configuration scheme is designed based on duplication degree and average path length. It is determined that the network resistance is inversely related to duplication degree and average path length under the simulation study of random attack technique. © 2023 IEEE.

关键词： Network layers

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A microspectrometer with dual-signal spectral reconstruction (17 Sept, 10.1038/s41928-024-01242-9, 2024)

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NATURE ELECTRONICS 2024年第12期7卷 1186-1186页

作者： Du, Xinchuan Wang, Yang Cui, Yi Rao, Gaofeng Huang, Jianwen Chen, Xinrui Zhou, Ting Wu, Chunyang Yang, Zongyin Cui, Hanxiao Zhao, Yicheng Xiong, Jie State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu China College of Information Science and Electronics Engineering Zhejiang University Hangzhou China School of Aeronautics and Astronautics Sichuan University Chengdu China

Computational spectrometers with small footprints can be integrated with other devices for use in applications such as chemical analysis, medical diagnosis and environmental monitoring. However, their spectral resolution is limited because conventional photoelectric detectors only measure an amplitude-dependent response to incident light. Here we show that a deformable two-dimensional homojunction can be used to create a microspectrometer with dual-signal spectral reconstruction. The semifloating molybdenum disulfide homojunction exhibits a giant electrostriction effect through which the kinetics of photo-generated carriers can be manipulated via an in-plane electric field generated by gate voltage. By leveraging the tunability of both amplitude and relaxation time of the photoelectric response, a dual-signal response can be used with a deep neural network algorithm to reconstruct an incident spectrum. Our dual-signal microspectrometer has a footprint of 20 × 25 µm2, offers a resolution of 1.2 nm and has a spectral waveband number of 380, which is comparable to benchtop spectrometers.

关键词： Molybdenum disulfide

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Stripe charge order and its interaction with Majorana bound states in 2M-WS2 topological superconductors

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National science Review 2025年第2期12卷 42-49页

作者： Xuemin Fan Xiao-Qi Sun Penghao Zhu Yuqiang Fang Yongkang Ju Yonghao Yuan Jingming Yan Fuqiang Huang Taylor L.Hughes Peizhe Tang Qi-Kun Xue Wei Li State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua University Frontier Science Center for Quantum Information Collaborative Innovation Center of Quantum Matter Institute for Condensed Matter Physics and Department of Physics University of Illinois at Urbana-Champaign State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University School of Materials Science and Engineering Beihang University Max Planck Institute for the Structure and Dynamics of Matter Center for Free-Electron Laser Science Beijing Academy of Quantum Information Sciences Southern University of Science and Technology

To achieve logic operations via Majorana braiding, positional control of the Majorana bound states（MBSs）must be established. Here we report the observation of a striped surface charge order coexisting with superconductivity and its interaction with the MBS in the topological superconductor 2M-WS2, using low-temperature scanning tunneling microscopy. By applying an out-of-plane magnetic field, we observe that MBSs are absent in vortices in the region with stripe order. This is in contrast to adjacent underlaying layers without charge order, where vortex-bound MBSs are observed. Via theoretical simulations, we show that the surface stripe order does not destroy the bulk topology, but it can effectively modify the spatial distribution of MBSs, i.e. it pushes them downward, away from the 2M-WS2surface. Our findings demonstrate that the interplay of charge order and topological superconductivity can potentially be used to tune the positions of MBSs, and to explore new states of matter.

关键词： Majorana bound states 2M-WS stripe charge order topological superconductor

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Improving high-field strain and temperature stability on KNN-based ceramics sintered in reducing atmosphere via defect engineering

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Journal of Materiomics 2024年第6期10卷 1165-1175页

作者： Zhenyong Cen Meiyi Feng Fuzhi Cao Yuqi Jiang Ze Xu Changrong Zhou Ke Wang Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Proce sing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi Univers ityNanning530004China Guangexi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High-field strain and its temperature stability of(1-x)K_(0.48)Na_(0.52)Nb_(0.96)Ta_(0.04)O_(3)-xBaZrO_(3)+8%MnO+3%ZrO_(2)(in mole,KNNT-xBZ+8Mn)ceramics sintered in reducing atmosphere are improved simultaneously via defect design in A and B *** is a conducting type transition from n-type to p-type at x=*** BaZrO_(3) dopant not only induces the increase of defects(Zr′_(Nb),Ba_(Na),Ba_(K))concentration,but also results in the increase of defect(Mn″_(Nb))concentration,because more Mn ions as+2 oxidation state in ceramics is triggered by BaZrO3 doping *** dipoles(Mn″_(Nb)-V_(o),Zr′_(Nb)-V_(o),Ba_(Na)-V′_(Na),Ba_(Na)-V′_(Na))in poled and aged ceramics enhance the reversibility of the non-180°domains switching,which increases the high-field strain of KNNT-xBZ+8Mn *** reversibility of non-180°domain switching can be preserved to high temperature due to stable defect dipoles(Ba_(Na)-V′_(Na),Ba_(K)-V′_(K))in *** KNNT-xBZ+8Mn ceramics at x=0.07 show the largest high-field strain coefficient(543 pm/V@20 kV/cm)and the highest temperature stability(125℃).The KNNT-xBZ+8Mn ceramic is a lead-free material with great potential to be applied in the fabrication of multilayer ceramic actuators with Ni inner electrodes in the future.

关键词： Lead-free ceramics Piezoelectric materials Reducing atmosphere Defects

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