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Communication efficiency optimization of federated learning for computing and network convergence of 6G networks

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Frontiers of Information Technology & Electronic Engineering 2024年第5期25卷 713-727页

作者： Yizhuo CAI Bo LEI Qianying zhao Jing PENG Min WEI Yushun ZHANG Xing ZHANG Wireless Signal Processing and Network Laboratory Beijing University of Posts and TelecommunicationsBeijing 100876China Research Institute of China Telecom Co. Ltd.Beijing 102209China Beijing Telecom Beijing 100011China

Federated learning effectively addresses issues such as data privacy by collaborating across participating devices to train global ***,factors such as network topology and computing power of devices can affect its training or communication process in complex network *** and network convergence(CNC)of sixth-generation(6G)networks,a new network architecture and paradigm with computing-measurable,perceptible,distributable,dispatchable,and manageable capabilities,can effectively support federated learning training and improve its communication *** guiding the participating devices'training in federated learning based on business requirements,resource load,network conditions,and computing power of devices,CNC can reach this *** this paper,to improve the communication eficiency of federated learning in complex networks,we study the communication eficiency optimization methods of federated learning for CNC of 6G networks that give decisions on the training process for different network conditions and computing power of participating *** simulations address two architectures that exist for devices in federated learning and arrange devices to participate in training based on arithmetic power while achieving optimization of communication efficiency in the process of transferring model *** results show that the methods we proposed can cope well with complex network situations,effectively balance the delay distribution of participating devices for local training,improve the communication eficiency during the transfer of model parameters,and improve the resource utilization in the network.

关键词： Computing and network convergence Communication efficiency Federated learning Two architectures

存算一体技术研究进展及其在电网中的应用探索

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电网技术 2024年第1期48卷 300-314页

作者：焦飞宋睿张鋆彭国政周华良李友军赵传奇张树华中国电力科学研究院有限公司北京市海淀区100192 南瑞集团有限公司江苏省南京市211100

基于数据驱动的人工智能方法在电力系统运维实际应用中展示出相当的优势,但目前人工智能技术在电力系统中还未能实现泛在落地应用,其关键原因之一为电力智能计算设备对人工智能模型的支撑能力不足。一方面,目前电力边、端侧设备资源受限... 详细信息

基于数据驱动的人工智能方法在电力系统运维实际应用中展示出相当的优势,但目前人工智能技术在电力系统中还未能实现泛在落地应用,其关键原因之一为电力智能计算设备对人工智能模型的支撑能力不足。一方面,目前电力边、端侧设备资源受限,普遍存在计算能力不足等问题,无法支撑复杂电力人工智能模型的部署和运行;另一方面,由于电力系统规模的扩大和复杂程度的增加,电力云计算中心需要处理PB级海量数据并进行大规模电力调度计算,开始出现“算不动”的问题,难以满足电力系统快速响应需求,且耗能也不断攀升。存算一体技术是一种直接利用存储器进行数据处理的新型计算技术,可实现高算力、低功耗电力数据高效能处理,为解决新型电力系统难题提供了新的思路。基于此,详细归纳了存算一体技术的主流研究方向,阐释了存算一体技术在电网应用的可行性,提出了一些潜在电力应用场景,分析了实际应用中可能会面临的挑战,旨在为存算一体技术在电网的应用明确重点和方向。

关键词：电力系统存算一体技术高算力低功耗边缘智能

Numerical Simulation of Jet Behavior and Impingement Characteristics of Preheating Shrouded Supersonic Jets

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Journal of Iron and Steel Research International 2016年第10期23卷 997-1006页

作者： Guang-sheng WEI Rong ZHU ting CHENG Fei zhao School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials University of Science and Technology Beijing National Center for Materials Service Safety University of Science and Technology Beijing

As a novel supersonic jet technology,preheating shrouded supersonic jet was developed to deliver oxygen into molten bath efficiently and ***,there has been limited research on the jet behavior and impingement characteristics of preheating shrouded supersonic *** fluid dynamics（CFD）models were established to investigate the effects of main and shrouding gas temperatures on the characteristics of flow field and impingement of shrouded supersonic *** preheating shrouded supersonic jet behavior was simulated and measured by numerical simulation and jet measurement experiment *** influence of preheating shrouded supersonic jet on gas jet penetration and fluid flow in liquid bath was calculated by the CFD model which was validated against water model *** results show that the uptrend of the potential core length of shrouded supersonic jet would be accelerated with increasing the main and shrouding gas ***,preheating supersonic jets demonstrated significant advantages in penetrating and stirring the liquid bath.

关键词： shrouded supersonic jet preheating gas temperature jet behavior impingement flow field

Efficient and stable hybrid perovskite-organic light-emitting diodes with external quantum efficiency exceeding 40 per cent

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Light(Science & Applications) 2024年第7期13卷 1364-1371页

作者： Lingmei Kong Yun Luo Qianqian Wu Xiangtian Xiao Yuanzhi Wang Guo Chen Jianhua Zhang Kai Wang Wallace CHChoy Yong-Biao zhao Hongbo Li Takayuki Chiba Junji Kido Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China. Institute of Nanoscience and Applications Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China. Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina. Department of Physics and Lakeside AR/VR Laboratory International Joint Research Center for Optoelectronic and Engineering ResearchYunnan UniversityKunming 650091China. Experimental Center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China. Graduate School of Organic Materials Science Frontier Center for Organic MaterialsYamagata University4-3-16 JonanYonezawa 992–8510Japan

Light-emitting diodes(LEDs)based on perovskite semiconductor materials with tunable emission wavelength in visible light range as well as narrow linewidth are potential competitors among current light-emitting display technologies,but still suffer from severe instability driven by electric ***,we develop a stable,efficient and highcolor purity hybrid LED with a tandem structure by combining the perovskite LED and the commercial organic LED technologies to accelerate the practical application of *** LED and organic LED with close photoluminescence peak are selected to maximize photon emission without photon reabsorption and to achieve the narrowed emission *** designing an efficient interconnecting layer with p-type interface doping that provides good opto-electric coupling and reduces Joule heating,the resulting green emitting hybrid LED shows a narrow linewidth of around 30 nm,a peak luminance of over 176,000 cd m^(−2),a maximum external quantum efficiency of over 40%,and an operational half-lifetime of over 42,000 h.

关键词： diodes narrow quantum

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精细景观制图揭示城市环境的同质性

Science Bulletin 2024年第12期69卷 1802-1805页

作者：徐知宇赵淑清 College of Urban and Environmental Sciences Peking UniversityBeijing 100871China School of Ecology Hainan UniversityHaikou 570228China

Urbanization,characterized by multifaceted interactions encompassing social,economic,institutional,and environmental dimensions[1,2],generate intricate and heterogeneous urban landscape with interwoven blue,green,and gray elements[3].Unlocking the delicate urban landscape structure requires finegrained urban blue-green-gray landscape mapping for an accurate measurement of irregularities,fragmentation,and shape complexity within the urban fabric[4,5].

关键词： landscape 景观制图 dimensions

基于J-C模型修正的7150-T6航空铝合金薄壁开孔圆管结构优化

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机械工程学报 2024年第11期60卷 95-104页

作者：陈睿程诗敏温仕成赵子衡彭锐涛胡聪芳肖湘武湘潭大学机械工程与力学学院湘潭411105 湘潭大学复杂轨迹加工工艺及装备教育部工程研究中心湘潭411105

为了提高薄壁结构的耐撞性能,提出了一种改进的Johnson-Cook材料本构模型,结合数值计算和智能算法开展了航空铝合金薄壁开孔结构优化设计。对7150-T6航空铝合金材料进行了静动态压缩试验,其结果表明该材料具有显著的应变速率敏感性。综... 详细信息

为了提高薄壁结构的耐撞性能,提出了一种改进的Johnson-Cook材料本构模型,结合数值计算和智能算法开展了航空铝合金薄壁开孔结构优化设计。对7150-T6航空铝合金材料进行了静动态压缩试验,其结果表明该材料具有显著的应变速率敏感性。综合材料的静动态力学特性,提出一种改进的Johnson-Cook模型,并且通过试验验证该模型能更好地描述材料的动态力学行为。结合改进的本构模型和分离式霍普金森压杆试验,建立有效可靠的薄壁圆管霍普金森杆轴向冲击有限元模型,并探讨了等距离设置长方形孔对薄壁圆管构件的耐撞性和最大峰值载荷的影响。利用遗传算法开展航空铝合金薄壁开孔圆管的多目标优化设计,并将其优化结果与试验进行验证。结果表明:改进的模型能够很好地描述7150-T6航空铝合金在不同应变速率下的塑性流动应力特性,且优化后的开孔圆管具有较好的耐撞性能和稳定的变形模式,能为薄壁结构的设计与性能研究提供有效参考。

关键词： 7150-T6航空铝合金结构优化 Johnson-Cook本构模型修正 SHPB试验

应急物资采购及代储服务交易的逆向组合拍卖机制设计

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控制与决策 2024年第5期39卷 1527-1536页

作者：张萌孔昭君北京理工大学管理与经济学院北京100081

建立市场化的政企联合储备模式已经成为应急物资储备体系建设的重要方式.基于此,着眼于应急物资采购及代储服务的交易问题,设计一个逆向组合拍卖机制.在此拍卖机制中,政府是拍卖的买方兼委托人,企业是拍卖的卖方兼竞拍者,应急物资采购... 详细信息

建立市场化的政企联合储备模式已经成为应急物资储备体系建设的重要方式.基于此,着眼于应急物资采购及代储服务的交易问题,设计一个逆向组合拍卖机制.在此拍卖机制中,政府是拍卖的买方兼委托人,企业是拍卖的卖方兼竞拍者,应急物资采购及代储服务是拍卖商品.首先,通过一个报童模型建立政府决策行为与拍卖活动之间的关系,并提出企业的投标策略;其次,建立最小化供需偏差和最大化供给数量的竞胜标决定模型;最后,提出一个符合实际背景的数值算例对拍卖机制进行模拟和验证.研究表明,所提出的逆向组合拍卖机制不仅具有经济效率,还能够促进政府一次性达成与多家企业在多个周期的合作.由此可见,运用拍卖机制解决应急物资政企联合储备的交易问题具备理论的优越性和现实的适用性.

关键词：应急物资采购政企联合储备模式逆向组合拍卖机制报童模型供需匹配竞胜标决定原则

Features of Tropical Volcanic Rock and Soil of Jakarta-Bandung HSR and Engineering Countermeasures

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Chinese Railways 2024年第1期 30-37页

作者： zhao Dou WANG Shujie ZHENG Mingda(Translated) China Railway Design Corporation Track Station and Yard Design and Research InstituteChina Railway Design Corporation 不详

The geological features of three types of tropical volcanic rock and soil distributed along Jakarta-Bandung high-speed railway(HSR),including pozzolanic clayey soil,mud shale and deep soft soil,are studied through field and laboratory *** paper analyzes the mechanism and causes of engineering geological problems caused by tropical volcanic rock and soil and puts forward measures to control subgrade slope instability by rationally determining project type,making side slope stability control and strengthening waterproofing and ***“zero front slope”tunneling technology at the portal,the simplified excavation method of double-side wall heading and the cross brace construction method of arch protection within the semi-open cut row pile frame in the“mountainside”eccentrically loaded soft soil stratum are adopted to control the instability of tunnel side and front slopes,foundation pits and working faces;CFG or pipe piles shall be used to reinforce soft and expansive foundation or replacement measures shall be taken,and the scheme of blind ditch+double-layer water sealing in ballastless track section shall be put forward to prevent arching deformation of foundation;the treatment measures of CFG pile,pipe pile and vacuum combined piled preloading are adopted to improve the bearing capacity of foundation in deep soft soil section and solve the problems of settlement control and uneven *** engineering countermeasures have been applied during the construction of Jakarta-Bandung HSR and achieved good results.

关键词： Jakarta-Bandung HSR tropical volcanic rock and soil engineering geological features engineering geological problems engineering countermeasures

网络空间多粒度时空数据模型构建及其适配双变量不确定性表达符号研究

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地球信息科学学报 2024年第7期26卷 1577-1593页

作者：赵帅张政华一新赵文双赵鑫科陈敏颉吉晓宇战略支援部队信息工程大学地理空间信息学院郑州450000 武警特种警察学院北京102211 西藏农牧学院资源与环境学院林芝860000 郑州师范学院信息科学与技术学院郑州450000

不确定性可视化是网络空间地图可视化领域的重点和难点,合理的不确定性符号设计对网络空间地图信息的快速读取挖掘与精准分析决策至关重要。本文提出了一种基于多粒度时空对象数据模型的网络空间双变量不确定性符号表达方法,解决网络空... 详细信息

不确定性可视化是网络空间地图可视化领域的重点和难点,合理的不确定性符号设计对网络空间地图信息的快速读取挖掘与精准分析决策至关重要。本文提出了一种基于多粒度时空对象数据模型的网络空间双变量不确定性符号表达方法,解决网络空间节点链接图中变量符号无法及时高效地体现节点、连边不确定性表达不一致的情况。以地理社交网络为案例,首先采用多粒度时空数据模型建模的方法,分析网络空间对象建模的内容和流程,设计网络空间实体对象类并创建相应时空对象;在此基础上结合传统符号在网络空间节点链接图表达方面存在的问题,分析网络空间不确定性表达原理和模型,制作相应的视觉熵符号;最后开展对照实验,并采用统计方法对符号实验结果进行检验。结果表明基于对象化建模的方法有助于网络空间多粒度、全类型、多维动态的表达,通过可视化和交互技术能生动直观、全面多维地表现网络空间的发展变化;新设计的视觉熵符号在网络空间双变量不确定性差异表达方面的效果较好,有助于及时高效准确地获取网络空间的不确定性信息。研究可以为网络空间地图可视化领域的发展提供一定借鉴和参考。

关键词：网络空间多粒度时空数据模型视觉熵符号双变量不确定性网络空间地图可视化