检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

对抗光学神经网络识别误差的渐进式训练方法

光学学报 2024年第7期44卷 131-138页

作者：郭鹏星游正容侯维刚郭磊重庆邮电大学通信与信息工程学院重庆400065 重庆邮电大学智能通信与网络安全研究院重庆400065

提出了一种渐进式训练方案来重新配置马赫-曾德尔干涉仪(MZI)前馈光学神经网络(ONN)的相移,从而对抗MZI的相位误差和分束器误差,提高识别准确率。为了验证所提方案,利用Neuroptica Python仿真平台搭建了3层MZIONN结构,并在考虑到MZI相... 详细信息

提出了一种渐进式训练方案来重新配置马赫-曾德尔干涉仪(MZI)前馈光学神经网络(ONN)的相移,从而对抗MZI的相位误差和分束器误差,提高识别准确率。为了验证所提方案,利用Neuroptica Python仿真平台搭建了3层MZIONN结构,并在考虑到MZI相位误差和分束器误差的情况下,利用Iris和MNIST数据集验证了所提方案的有效性。仿真结果表明:在Iris数据集下,对于3层4×4 MZI-ONN结构,所提方案的识别准确率能够提升64.15百分点;在MNIST数据集下,对于4×4、6×6、8×8和16×16规模的MZI-ONN,所提方案的识别准确率能够提升2.00~37.00百分点。所提方案极大地提高了MZI-ONN的抗误差性能,有助于未来大规模、高准确率MZI-ONN的实现。

关键词：光计算马赫-曾德尔干涉仪光学神经网络相位误差分束器误差渐进式训练抗误差

基于相变材料的低损耗可重构无阻塞光交换网络

在线全文

学校读者我要写书评

暂无评论

光学学报 2024年第11期44卷 50-57页

作者：熊羽庭郭鹏星周佳豪侯维刚郭磊重庆邮电大学通信与信息工程学院重庆400065 重庆邮电大学智能通信与网络安全研究院重庆400065

提出一种以相变材料为基础的低损耗可重构无阻塞光交换网络架构。首先,设计基于低吸收损耗相变材料Sb2Se3与马赫-曾德尔干涉仪(MZI)的2×2全光开关单元,通过光控Sb2Se3相变状态实现开关状态的切换。该单元无需外界持续的偏置电压即可保... 详细信息

提出一种以相变材料为基础的低损耗可重构无阻塞光交换网络架构。首先,设计基于低吸收损耗相变材料Sb2Se3与马赫-曾德尔干涉仪(MZI)的2×2全光开关单元,通过光控Sb2Se3相变状态实现开关状态的切换。该单元无需外界持续的偏置电压即可保持开关状态,具有非易失性的特点,此外还能够降低功耗,减少芯片面积。基于此,通过Benes拓扑将2×2光开关与交叉波导级联,构建8×8无阻塞光交换网络。通过调整不同开关单元中Sb2Se3的相变状态,实现8×8光交换网络中任意输入端口至输出端口的可重构光路交换。运用Ansys Lumerical仿真平台对所设计的2×2光开关及交叉波导结构进行仿真与优化,验证所提光交换网络的全连接无阻塞数据交换功能。仿真结果显示,所提2×2光开关的插入损耗和串扰噪声分别低于0.072 dB和-55.66 dB,8×8光交换网络的插入损耗和串扰噪声分别低于0.500 dB和-45.00 dB。因此,所设计的低损耗性能优势的开关结构有助于实现大规模光子集成交换网络。

关键词：集成光学光交换非易失性可重构性马赫-曾德尔干涉仪相变材料

政党引领的认知基础:理解基层应对重大突发公共危机的微观视角--基于安徽省Q社区与S社区防疫政策执行的比较

在线全文

学校读者我要写书评

暂无评论

云南行政学院学报 2024年第3期26卷 116-128页

作者：候为刚中国人民大学国际关系学院

为解释基层重大突发公共危机政策执行的一般历程与差异化轨迹,针对当前学界聚焦党建引领这一结构性解释的研究局限,文章尝试将以政党引领为核心的自上而下行政体系与政治精英的认知能动性加以融合,对既有的政党引领模式进行检视。通过... 详细信息

为解释基层重大突发公共危机政策执行的一般历程与差异化轨迹,针对当前学界聚焦党建引领这一结构性解释的研究局限,文章尝试将以政党引领为核心的自上而下行政体系与政治精英的认知能动性加以融合,对既有的政党引领模式进行检视。通过比较安徽省F区两个社区应对新冠肺炎疫情危机的政策执行过程,发现集中统一领导的决策体制为当地迅速动员和组织各方力量以应对此次疫情危机提供根本的制度保证。然而,政治精英(如基层干部)对疫情危机的认知模式存在能动差异,导致这两个社区在防疫政策执行方面的表现明显不同。同质化的政党引领体制与异质性的风险认知模式相互作用,共同形塑基层防疫政策执行的演变轨迹。最后,文章对如何拓宽政党引领模式在应对重大突发公共危机中的知识生产与实践方面作进一步思考。

关键词：重大突发公共危机政党引领认知能动性比较案例分析

维普期刊数据库博看期刊

宽带多载波微波光链路的自适应非迭代线性化技术

在线全文

学校读者我要写书评

暂无评论

光学学报 2024年第12期44卷 197-205页

作者：卢冰陈康侯维刚白一凡张佳昕郭磊重庆邮电大学通信与信息工程学院重庆400065 重庆邮电大学智能通信与网络安全研究院重庆400065

本文针对宽带多载波微波光子链路(MPL)中产生的带内三阶交调失真(IMD3)和带外互调失真(XMD),给出了相应的非线性失真模型,然后基于失真模型中的XMD和IMD3信号与基频信号符号相反的特性来获取具有闭式解的代价函数,从而在快速自适应获取... 详细信息

本文针对宽带多载波微波光子链路(MPL)中产生的带内三阶交调失真(IMD3)和带外互调失真(XMD),给出了相应的非线性失真模型,然后基于失真模型中的XMD和IMD3信号与基频信号符号相反的特性来获取具有闭式解的代价函数,从而在快速自适应获取最优线性化系数的同时完成对XMD和IMD3的补偿。与现有的XMD和IMD3补偿方法相比,该方法无需系统和信号的先验参数,无需复杂的训练和迭代优化过程,实用性更好。仿真结果表明,在基于马赫-曾德尔调制器的MPL中传输多音信号时,链路中产生的XMD和IMD3分别被抑制了35 dB和29 dB以上;此外,当传输多载波正交频分复用信号时,信号的误差矢量幅值从8.1%优化到了2.2%。

关键词：微波光子学数字线性化三阶交调失真互调失真

Virtual network embedding for hybrid cloud rendering in optical and data center networks

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第2期59卷 139-152页

作者： weigang hou Lei GUO School of Computer Science and Engineering Northeastern University State Key Laboratory of Networking and Switching Technology State Key Laboratory of Information Photonics and Optical Communications

Animation rendering consumes massive computation time, therefore cloud rendering is emerging as a solution. Cloud rendering runs over the Data Center Network(DCN) and consolidates heterogeneous DC resources into a single cloud renderfarm, where plentiful computing resources can sufficiently accelerate any rendering process. And if one user wants to get a quick animation result, a high-speed optical interconnection is an urgent requirement, thus cloud rendering needs a convergence of Optical and DCN(ODCN) as the substrate network. In the ODCN supporting cloud rendering, each rendering task will be successfully handled only when we embed its virtual network into the cloud renderfarm. But because a virtual network includes virtual machines and virtual lightpaths, we must simultaneously perform the node-level mapping between virtual machine and server, as well as link-level mapping between virtual lightpath and fiber link(s). In addition, the joint implementation of the Photorealistic cloud Rendering(PR) and Non-Photorealistic cloud Rendering(NPR) should be considered to exhibit the unique animation effect with the low mapping cost. In this paper, considering the unique characteristic of hybrid cloud rendering, we flexibly select routing strategies according to the rendering task type. We then utilize server consolidation and traffic grooming to achieve node- and link-level mappings,respectively, thus building a mapping-cost-aware cloud renderfarm that includes multiple virtual networks. The mathematical formulation is also made with a bound analysis. Especially for the lower bound, we analyze the least number of servers and wavelengths(i.e., mapping cost) consumed by hybrid cloud rendering. In terms of heuristics, according to the processing order of rendering tasks, Smaller Virtual Resource First(SVRF) and Manycast Routing First(MRF) algorithms are proposed by us. In SVRF, NPR tasks are first tackled and then PR tasks follow. MRF is a reverse process of SVRF. The simu

关键词： hybrid cloud rendering optical and data center network virtual network embedding mapping cost lower bound

Designs of low insertion loss optical router and reliable routing for 3D optical network-on-chip

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第10期59卷 33-49页

作者： Pengxing GUO weigang hou Lei GUO School of Computer Science and Engineering Northeastern University

Three-Dimensional Optical Network-on-Chip(3D ONoC) has recently emerged as a high-performance on-chip communication solution; however, owing to the intrinsic characteristics of photonic devices in existing 3D ONoC, the insertion loss caused by undesirable coupling among optical signals degrades network performance. Considering manufacturing defects and unpredictable noise sources that cause the failure of Optical Routers(ORs) in 3D ONoC, previous work simply abandoned the disabled OR when computing the restore *** this paper, we propose a new OR structure that reduces insertion loss, and we present the design of a novel adaptive routing algorithm, FTRA-BL, based on the new OR structure with bidirectional waveguides, without abandoning any disabled ORs. Our FTRA-BL selects the normal waveguide in the disabled OR as the backup link so that the best macroscopic restore path can be guaranteed. Simulation results show that our method performs better than previous work in improving transmission reliability and latency.

关键词： 3D ONoC low insertion loss reliable routing bidirectional waveguide low latency

Designs of 3D Mesh and Torus Optical Network-on-Chips:Topology,Optical Router and Routing Module

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communications 2017年第5期14卷 17-29页

作者： Lei Guo weigang hou Pengxing Guo Key Laboratory of Medical Image Computing of Northeastern University Ministry of EducationShenyang 110819China School of Computer Science and Engineering Northeastern UniversityShenyang 110819China

As a nanometer-level interconnection,the Optical Network-on-Chip(ONoC)was proposed since it was typically characterized by low latency,high bandwidth and power efficiency. Compared with a 2-Dimensional(2D)design,the 3D integration has the higher packing density and the shorter wire length. Therefore,the 3D ONoC will have the great potential in the future. In this paper,we first discuss the existing ONoC researches,and then design mesh and torus ONoCs from the perspectives of topology,router,and routing module,with the help of 3D integration. A simulation platform is established by using OPNET to compare the performance of 2D and 3D ONoCs in terms of average delay and packet loss rate. The performance comparison between 3D mesh and 3D torus ONoCs is also conducted. The simulation results demonstrate that 3D integration has the advantage of reducing average delay and packet loss rate,and 3D torus ONoC has the better performance compared with 3D mesh solution. Finally,we summarize some future challenges with possible solutions,including microcosmic routing inside optical routers and highly-efficient traffic grooming.

关键词： Optical Network-on-Chip topology and optical router routing module

Virtual network embedding for power savings of servers and switches in elastic data center networks

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第12期59卷 97-110页

作者： weigang hou Cunqian YU Lei GUO Xuetao WEI School of Computer Science and Engineering Northeastern University School of Information Technology University of Cincinnati

Currently, the elastic interconnection has realized the high-rate data transmission among data centers(DCs). Thus, the elastic data center network(EDCN) emerged. In EDCNs, it is essential to achieve the virtual network(VN) embedding, which includes two main components: VM(virtual machine) mapping and VL(virtual link) mapping. In VM mapping, we allocate appropriate servers to hold VMs. While for VL mapping,an optimal substrate path is determined for each virtual lightpath. For the VN embedding in EDCNs, the power efficiency is a significant concern, and some solutions were proposed through sleeping light-duty ***, the increasing communication traffic between VMs leads to a serious energy dissipation problem, since it also consumes a great amount of energy on switches even utilizing the energy-efficient optical transmission technique. In this paper, considering load balancing and power-efficient VN embedding, we formulate the problem and design a novel heuristic for EDCNs, with the objective to achieve the power savings of servers and switches. In our solution, VMs are mapped into a single DC or multiple DCs with the short distance between each other, and the servers in the same cluster or adjacent clusters are preferred to hold VMs. Such that, a large amount of servers and switches will become vacant and can go into sleep mode. Simulation results demonstrate that our method performs well in terms of power savings and load balancing. Compared with benchmarks, the improvement ratio of power efficiency is 5%–13%.

关键词： elastic data center network green virtual network embedding integrated optimization load balancing power efficiency

Virtual 5G Network Embedding in a Heterogeneous and Multi-Domain Network Infrastructure

在线全文

学校读者我要写书评

暂无评论

China Communications 2016年第10期13卷 29-43页

作者： Cunqian Yu weigang hou Yingying Guan Yue Zong Pengxing Guo School of Computer Science and Engineering Northeastern University

The pursuit of the higher performance mobile communications forces the emergence of the fifth generation mobile communication(5G). 5G network, integrating wireless and wired domain, can be qualified for the complex virtual network work oriented to the cross-domain requirement. In this paper, we focus on the multi-domain virtual network embedding in a heterogeneous 5G network infrastructure, which facilitates the resource sharing for diverse-function demands from fixed/mobile end users. We proposed the mathematical ILP model for this *** based on the layered-substrate-resource auxiliary graph and an effective six-quadrant service-type-judgment method, 5G embedding demands can be classified accurately to match different user access densities. A collection of novel heuristic algorithms of virtual 5G network embedding are proposed. A great deal of numerical simulation results testified that our algorithm performed better in terms of average blocking rate, routing latency and wireless/wired resource utilization, compared with the benchmark.

关键词： 5G virtual network embedding heterogeneous and multi-domain infrastructure wireless channel capacity data center