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DDoS Defense Algorithm Based on Multi-Segment Timeout Technology 认领 引用 被引量：1
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作者 DU Ruizhong YANG Xiaohui MA Xiaoxue HE Xinfeng 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第6期1823-1826,共4页
Through the analysis to the DDoS（distributed denial of service） attack, it will conclude that at different time segments, the arrive rate of normal SYN （Synchronization） package are similar, while the abnormal pac... Through the analysis to the DDoS（distributed denial of service） attack, it will conclude that at different time segments, the arrive rate of normal SYN （Synchronization） package are similar, while the abnormal packages are different with the normal ones. Toward this situation a DDoS defense algorithm based on multi-segment timeout technology is presented, more than one timeout segment are set to control the net flow. Experiment results show that in the case of little flow, multi-segment timeout has the ability dynamic defense, so the system performance is improved and the system has high response rate. 展开更多
关键词 DDoS（distributed denial of service） multi-segments timeout dynamic defense net flow analysis
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Influence of the Multi-segment Micro-crack and Groups of Kinked Micro-cracks on the Plastic Behavior of a Macro-crack 认领 引用
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作者 Hongda Yang Jiding Zhang +1 位作者 Wentao Ma Xiaoyu Jiang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2025年第6期970-979,共10页
Combining the continuously distributed dislocation technique(DDT)and the von Mises yield criterion,new double-crack and multi-crack models were established.The influences of multi-segment kinked micro-cracks and group... Combining the continuously distributed dislocation technique(DDT)and the von Mises yield criterion,new double-crack and multi-crack models were established.The influences of multi-segment kinked micro-cracks and groups of kinked micro-cracks on the plastic behavior of the macro-crack were investigated.The results show that a smaller kinking angle of the micro-crack enhances its influence on the plastic deformation of the macro-crack,potentially leading to plastic zone fusion.Meanwhile,micro-cracks with smaller kinking angles exert a stronger attracting force on macro-crack growth,facilitating convergence between them.Furthermore,annularly distributed micro-crack groups demonstrate a more pronounced attraction on macro-crack propagation compared to linearly distributed micro-crack groups.The double-crack and multi-crack models established in this paper offer a theoretical framework for analyzing the plastic fracture behavior of metallic materials containing complex kinked cracks. 展开更多
关键词 Distributed dislocation technique Multi-segment micro-crack Groups of kinked micro-cracks Plastic zone
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医疗失效模式与效应分析在手术安全核查Time-out环节中的应用 认领 引用 被引量：1
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作者 陈红 张春瑾 +1 位作者 吴波 王禾 《护理学杂志》 CSCD 北大核心 2026年第6期54-58,共5页
目的探讨医疗失效模式与效应分析在手术安全核查Time-out环节中的应用效果,为提升手术室护理质量提供参考。方法采用历史对照性研究,将2023年8-10月的11204例手术患者作为对照组,在Time-out环节中采用常规手术安全核查方式;2024年5-7月... 目的探讨医疗失效模式与效应分析在手术安全核查Time-out环节中的应用效果,为提升手术室护理质量提供参考。方法采用历史对照性研究,将2023年8-10月的11204例手术患者作为对照组,在Time-out环节中采用常规手术安全核查方式;2024年5-7月的11543例手术患者作为观察组,通过成立医疗失效模式与效应分析小组确定手术室Time-out核查环节中的失效模式,分析根本原因,拟定行动计划并组织实施。结果观察组Time-out规范执行率、手术及麻醉风险陈述确切率、安全核查单填写准确率、安全核查单归档率显著优于对照组(均P<0.05)。结论应用医疗失效模式与效应分析对手术安全核查Time-out环节进行规范管理,可以有效提升Time-out核查流程执行的规范性,保障手术患者安全。 展开更多
关键词 手术室 医疗失效模式与效应分析 手术安全核查 术前暂停核查 护理安全 护理管理
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融合XADC反馈与超时响应的JESD204B IP核优化设计 认领 引用
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作者 谢达 于宗光 +2 位作者 范继聪 曹正州 单悦尔 《集成电路与嵌入式系统》 CSCD 2026年第5期30-37,共8页
JESD204B接口协议的链路建链稳定性是保障高速数据通信可靠性的核心前提,对提升高速数据采集传输系统的性能具有重要意义。针对传统JESD204B IP核在高低温等恶劣环境下链路建链成功率低、故障定位效率差的问题,提出一种兼顾环境适应性... JESD204B接口协议的链路建链稳定性是保障高速数据通信可靠性的核心前提,对提升高速数据采集传输系统的性能具有重要意义。针对传统JESD204B IP核在高低温等恶劣环境下链路建链成功率低、故障定位效率差的问题,提出一种兼顾环境适应性与可调试性的JESD204B IP核优化方案。采用分层优化策略,在JESD204_phy核中引入XADC温度采集模块,根据实时温度区间动态配置高速接口参数,提升链路抗温度漂移能力;在JESD204_core核中增设链路建链超时响应模块,通过错误类型分类统计与有序复位控制避免建链超时导致的链路阻塞,并为故障定位提供量化依据。搭建“ADC+FPGA”数据采集传输验证系统架构,在-55~125℃宽温范围内测试。实验结果表明,在极限高低温工况下链路建链成功率较传统方案提升约8%,且能有效定位故障原因,验证了该优化IP核的高可靠性与工程实用性,可满足恶劣环境下的高速数据传输需求。 展开更多
关键词 JESD204B IP核 链路建链 XADC 超时响应
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万兆同轴宽带接入网HIMAC 3.0的拆帧重排序方法 认领 引用 被引量：1
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作者 黄一明 潘伟涛 邱智亮 《电子科技》 2026年第1期25-31,共7页
高性能同轴电缆网络(High Performance Network Over Coax,HINOC)技术是一种光纤同轴混合接入技术,已发展至第3代。为了实现万兆以太网的接入速率,第3代HINOC引入了多信道绑定机制。但该机制在有效扩展HINOC网络信道带宽的同时易导致HIM... 高性能同轴电缆网络(High Performance Network Over Coax,HINOC)技术是一种光纤同轴混合接入技术,已发展至第3代。为了实现万兆以太网的接入速率,第3代HINOC引入了多信道绑定机制。但该机制在有效扩展HINOC网络信道带宽的同时易导致HIMAC(HINOC Medium Access Control)拆帧端接收的数据流失序。针对该问题,文中提出了一种拆帧重排序方法。通过重排序队列缓存管理、入队逻辑地址计算、超时判断及清空以及出队判断等关键技术的设计和实现来解决多信道绑定机制引起的拆帧乱序问题,并对其关键功能点进行仿真验证和板级验证。实验结果表明,所提方法能够有效处理多信道绑定导致的乱序问题,并且能够确保系统在遇到错误情况时稳定运行,具有较强的鲁棒性,满足万兆同轴宽带接入HIMAC 3.0的功能和性能要求。 展开更多
关键词 万兆同轴宽带接入 HIMAC 3.0 多信道绑定 数据帧乱序 拆帧 重排序 超时清空 队列缓存
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Three-dimensional numerical analysis on combustion performance and flow of hybrid rocket motor with multi-segmented grain 认领 引用 被引量：6
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作者 Hui TIAN Yu DUAN Hao ZHU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第4期1181-1191,共11页
This paper presents the combustion characteristics in hybrid rocket motors with multisegmented grain through three-dimensional numerical simulations.Multi-segmented grain is composed of several thin grains with two or... This paper presents the combustion characteristics in hybrid rocket motors with multisegmented grain through three-dimensional numerical simulations.Multi-segmented grain is composed of several thin grains with two or more ports.The numerical model consists of Navier-Stokes equations with turbulence,solid fuel pyrolysis,chemical reactions,a fluid–solid coupling model and a regression rate model.The simulations adopt 90%Hydrogen Peroxide(HP)and PolyEthylene(PE)as the propellant combination.The effects of the rotation,port number,fuel grain segment number and mid-chamber length on the flow field and combustion performances are analyzed.The results indicate that the multi-segmented grain configuration can strengthen the flow field,and the regression rate and combustion efficiency are enhanced.Take the cases with two grain segments and three ports for example,the regression rate is increased by 32.4%-45.1%and the combustion efficiency increases by 6%-8.6%in different rotation angles. 展开更多
关键词 Combustion efficiency Hybrid rocket motor Multi-segmented grain Regression rate Rotation angle
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Multi-segment and Multi-ply Overlapping Process of Multi Coupled Activities Based on Valid Information Evolution 认领 引用 被引量：1
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作者 WANG Zhiliang WANG Yunxia QIU Shenghai 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第1期176-188,共13页
Complex product development will inevitably face the design planning of the multi-coupled activities, and overlapping these activities could potentially reduce product development time, but there is a risk of the addi... Complex product development will inevitably face the design planning of the multi-coupled activities, and overlapping these activities could potentially reduce product development time, but there is a risk of the additional cost. Although the downstream task information dependence to the upstream task is already considered in the current researches, but the design process overall iteration caused by the information interdependence between activities is hardly discussed; especially the impact on the design process＇ overall iteration from the valid information accumulation process. Secondly, most studies only focus on the single overlapping process of two activities, rarely take multi-segment and multi-ply overlapping process of multi coupled activities into account; especially the inherent link between product development time and cost which originates from the overlapping process of multi coupled activities. For the purpose of solving the above problems, as to the insufficiency of the accumulated valid information in overlapping process, the function of the valid information evolution （VIE） degree is constructed. Stochastic process theory is used to describe the design information exchange and the valid information accumulation in the overlapping segment, and then the planning models of the single overlapping segment are built. On these bases, by analyzing overlapping processes and overlapping features of multi-coupling activities, multi-segment and multi-ply overlapping planning models are built; by sorting overlapping processes and analyzing the construction of these planning models, two conclusions are obtained： （1） As to multi-segment and multi-ply overlapping of multi coupled activities, the total decrement of the task set development time is the sum of the time decrement caused by basic overlapping segments, and minus the sum of the time increment caused by multiple overlapping segments; （2） the total increment of development cost is the sum of the cost increment caused by all overlapping process. And then, based on overlapping degree analysis of these planning models, by the V1E degree function, the four lemmas theory proofs are represented, and two propositions are finally proved： （1） The multi-ply overlapping of the multi coupled activities will weaken the basic overlapping effect on the development cycle time reduction （2） Overlapping the multi coupled activities will decrease product development cycle, but increase product development cost. And there is trade-off between development time and cost. And so, two methods are given to slacken and eliminate multi-ply overlapping effects. At last, an example about a vehicle upper subsystem design illustrates the application of the proposed models; compared with a sequential execution pattern, the decreasing of development cycle （22%） and the increasing of development cost （3%） show the validity of the method in the example The proposed research not only lays a theoretical foundation for correctly planning complex product development process, but also provides specific and effective operation methods for overlapping multi coupled activities. 展开更多
关键词 multi coupled activities valid information evolution multi-segment ＆ multi-ply overlapping development time and cost,trade-ofl iteration
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基于命中信息压缩的流表空闲超时方法 认领 引用
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作者 阎封宜 刘磊 《电子设计工程》 2026年第2期145-149,158,共5页
随着网络技术的发展和新兴业务带来的用户需求增长,网络规模不断扩大,流表项的数量迅速增加。为解决SDN网络中大规模流表空闲超时处理的资源占用问题,提出一种基于命中信息压缩的流表空闲超时机制。该机制由数据平面软硬协同实现,在硬... 随着网络技术的发展和新兴业务带来的用户需求增长,网络规模不断扩大,流表项的数量迅速增加。为解决SDN网络中大规模流表空闲超时处理的资源占用问题,提出一种基于命中信息压缩的流表空闲超时机制。该机制由数据平面软硬协同实现,在硬件上进行流表匹配命中情况的统计,对命中信息进行压缩存储;软件定时与硬件进行压缩信息同步,计算并判断表项的超时情况。测试结果表明,相较于无压缩存储机制,该方法能够在1M条表项、支持数据包100 Gbps转发速率的前提下,节约90%的硬件存储空间。 展开更多
关键词 软件定义网络 流表 空闲超时 压缩
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动车段(所)运检作业自动监控系统研究与实现 认领 引用
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作者 王琳 赵刚 +2 位作者 林炳跃 付紫彪 崔莹莹 《铁道通信信号》 2026年第7期100-106,共7页
随着我国高速铁路网的不断快速发展,动车段(所)的运用检修作业任务日益繁重,对动车段(所)各部门协同作业提出了更高要求。为进一步提高运检作业效率,研究开发了动车段(所)运检作业自动监控系统。该系统采用B/S架构,利用Spring Boot+Vue... 随着我国高速铁路网的不断快速发展,动车段(所)的运用检修作业任务日益繁重,对动车段(所)各部门协同作业提出了更高要求。为进一步提高运检作业效率,研究开发了动车段(所)运检作业自动监控系统。该系统采用B/S架构,利用Spring Boot+Vue技术框架进行开发,具备动车组运检作业自动监测追踪、运检作业展示与统计、基础数据管理及接口数据采集四大模块。系统利用车组号唯一性,实现数据筛选;通过构建调车映射表,结合现场动车组作业流程,形成动车组运检作业顺序列表,完成数据整合,实现动车组运检作业自动监测追踪的核心功能。目前该系统已在西安动车段开展试用。试用结果表明:该系统能够充分满足现场作业人员的多样化需求,也可为上级部门的决策调整提供支撑。 展开更多
关键词 动车段(所) 运检作业 自动监控 超时报警 统计分析
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基于关联数据的RBC系统无线超时智能分析研究 认领 引用
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作者 殷飞 杨欣浩 田宏达 《铁路通信信号工程技术》 2026年第6期32-38,共7页
CTCS-3级列控系统车地通信过程中,面临无线超时故障等问题,影响铁路运营效率与经济效益。为快速关联多源异构数据并准确定位无线超时故障,提出基于关联数据的智能分析方法。该方法依托大数据技术实现多源异构数据高效关联,结合智能分析... CTCS-3级列控系统车地通信过程中,面临无线超时故障等问题,影响铁路运营效率与经济效益。为快速关联多源异构数据并准确定位无线超时故障,提出基于关联数据的智能分析方法。该方法依托大数据技术实现多源异构数据高效关联,结合智能分析算法完成海量数据自动分析,辅助维护人员快速定位故障,提升系统运维效率,为列控系统安全稳定运行提供有力保障。 展开更多
关键词 无线超时 RBC系统 数据关联 人工智能
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核电厂应急柴油机启动超时问题分析与处理 认领 引用
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作者 殷玉龙 李豪 +1 位作者 张兰岐 白文强 《电力安全技术》 2026年第2期51-54,共4页
某核电厂18PA6B型应急柴油机在检修后的启动试验中,发生单排启动超时问题,对启动空气系统、燃油系统、进排气系统、控制与传动系统进行梳理排查、原因分析及设备调整,最终发现是由于北方冬夏季气候差异导致进入气缸氧气含量不同引发该问... 某核电厂18PA6B型应急柴油机在检修后的启动试验中,发生单排启动超时问题,对启动空气系统、燃油系统、进排气系统、控制与传动系统进行梳理排查、原因分析及设备调整,最终发现是由于北方冬夏季气候差异导致进入气缸氧气含量不同引发该问题,并通过寻优调节调速器油门CD1、CD2的设定值消除了此缺陷,为该型号应急柴油机单排启动超时问题处理及调速器参数寻优提供借鉴。 展开更多
关键词 应急柴油机 启动超时 冬夏季差异 调速器参数
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High-power and high optical conversion efficiency diode-end-pumped laser with multi-segmented Nd:YAG/Nd:YVO-4 认领 引用
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作者 Meng-Yao Wu Peng-Fei Qu +3 位作者 Shi-Yu Wang SEl Zhen Guo De-Fang Cai Bing-Bin Li 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第9期306-310,共5页
A novel flat-flat resonator consisting of two crystals（Nd：YAG ＋ Nd：YVO4） is established for power scaling in a diode-end-pumped solid-state laser. We systematically compare laser characteristics between multi-seg... A novel flat-flat resonator consisting of two crystals（Nd：YAG ＋ Nd：YVO4） is established for power scaling in a diode-end-pumped solid-state laser. We systematically compare laser characteristics between multi-segmented（Nd：YAG ＋ Nd：YVO4） and conventional composite（Nd：YAG ＋ Nd：YAG） crystals to demonstrate the feasibility of spectral line matching for output power scale-up in end-pumped lasers. A maximum continuous-wave output power of 79.2 W is reported at 1064 nm, with Mx2= 4.82, My2= 5.48, and a pumping power of 136 W in the multi-segmented crystals（Nd：YAG ＋ Nd：YVO4）. Compared to conventional composite crystals（Nd：YAG ＋ Nd：YAG）, the optical-optical conversion efficiency of multi-segmented crystals（Nd：YAG ＋ Nd：YVO4） from 808 nm to 1064 nm is enhanced from 30% to 58.8%,while the laser output sensitivity as affected by the diode-laser temperature is reduced from 55% to 9%. 展开更多
关键词 diode-pumped solid-state laser multi-segmented crystals（Nd：YAG ＋ Nd：YVO4） spectral line matching diode-laser temperature
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考虑超时风险的多目标卡车-无人机协同配送鲁棒优化 认领 引用
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作者 卢婉莹 石褚巍 夭梦丽 《陕西理工大学学报（自然科学版）》 2026年第3期83-96,共14页
针对“次日达”物流场景中服务时间不确定引发的潜在超时风险,提出了一种卡车-无人机协同配送路径优化问题。综合考虑时间成本与潜在超时风险,并引入预算不确定集,刻画服务时间不确定性,构建以总时间成本和超时风险最小化的多目标优化模... 针对“次日达”物流场景中服务时间不确定引发的潜在超时风险,提出了一种卡车-无人机协同配送路径优化问题。综合考虑时间成本与潜在超时风险,并引入预算不确定集,刻画服务时间不确定性,构建以总时间成本和超时风险最小化的多目标优化模型;针对不确定集和多目标特性给出了“非支配排序+理想点”的适应度评估方法;设计了一种基于Pareto支配的双层进化算法,上层采用小生境Pareto遗传算法决策客户的载具分配,下层设计多目标大邻域搜索算法优化配送节点的服务次序,并嵌入一种“非支配排序+拥挤度距离”的邻域解更替策略。设定多组案例来验证模型及算法的有效性,实验结果表明,在C202算例中,成本偏好下至多能节约26.96%的成本,风险偏好下至多能降低51.23%的风险,所提方法能够为配送中心提供多决策偏好下的配送方案。 展开更多
关键词 卡车-无人机协同配送 鲁棒优化 潜在超时风险 服务时间不确定性 多目标大邻域搜索
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Enhancement of thermal rectification by asymmetry engineering of thermal conductivity and geometric structure for multi-segment thermal rectifier 认领 引用 被引量：2
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作者 杜甫烨 张望 +1 位作者 王惠琼 郑金成 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第6期34-43,共10页
Thermal rectification is an exotic thermal transport phenomenon,an analog to electrical rectification,in which heat flux along one direction is larger than that in the other direction and is of significant interest in... Thermal rectification is an exotic thermal transport phenomenon,an analog to electrical rectification,in which heat flux along one direction is larger than that in the other direction and is of significant interest in electronic device applications.However,achieving high thermal rectification efficiency or rectification ratio is still a scientific challenge.In this work,we performed a systematic simulation of thermal rectification by considering both efforts of thermal conductivity asymmetry and geometrical asymmetry in a multi-segment thermal rectifier.It is found that the high asymmetry of thermal conductivity and the asymmetry of the geometric structure of multi-segment thermal rectifiers can significantly enhance the thermal rectification,and the combination of both thermal conductivity asymmetry and geometrical asymmetry can further improve thermal rectification efficiency.This work suggests a possible way for improving thermal rectification devices by asymmetry engineering. 展开更多
关键词 thermal conductivity simulation thermal rectification multi-segment thermal rectifier
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重水堆乏燃料水下2号链传输稳定性分析处理 认领 引用
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作者 周威 《电工技术》 2026年第9期251-253,共3页
重水堆乏燃料水下2号链承担着将乏燃料棒束从卸料池传输到接收池的关键任务。在日常卸料中,频繁出现2号链在卸料端停靠位置距离机械挡块过远、过近或执行超时问题,严重影响换料时的正常卸料操作和干预频次。经过数据统计和原因分析,确... 重水堆乏燃料水下2号链承担着将乏燃料棒束从卸料池传输到接收池的关键任务。在日常卸料中,频繁出现2号链在卸料端停靠位置距离机械挡块过远、过近或执行超时问题,严重影响换料时的正常卸料操作和干预频次。经过数据统计和原因分析,确定了限位开关漂移是造成该现象的最主要原因。通过调整限位开关的触发方式和开关组件设定时间,很好地解决了该问题。 展开更多
关键词 乏燃料 执行超时 限位开关
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An accurate retransmission timeout estimator for content-centric networking based on the Jacobson algorithm 认领 引用 被引量：2
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作者 Mortaza Nikzad Kamal Jamshidi +1 位作者 Ali Bohlooli Faiz Mohammad Faqiry 《Digital Communications and Networks》 SCIE CSCD 2022年第6期1085-1093,共9页
Accurately estimating of Retransmission TimeOut (RTO) in Content-Centric Networking (CCN) is crucial for efficient rate control in end nodes and effective interface ranking in intermediate routers. Toward this end, th... Accurately estimating of Retransmission TimeOut (RTO) in Content-Centric Networking (CCN) is crucial for efficient rate control in end nodes and effective interface ranking in intermediate routers. Toward this end, the Jacobson algorithm, which is an Exponentially Weighted Moving Average (EWMA) on the Round Trip Time (RTT) of previous packets, is a promising scheme. Assigning the lower bound to RTO, determining how an EWMA rapidly adapts to changes, and setting the multiplier of variance RTT have the most impact on the accuracy of this estimator for which several evaluations have been performed to set them in Transmission Control Protocol/Internet Protocol (TCP/IP) networks. However, the performance of this estimator in CCN has not been explored yet, despite CCN having a significant architectural difference with TCP/IP networks. In this study, two new metrics for assessing the performance of RTO estimators in CCN are defined and the performance of the Jacobson algorithm in CCN is evaluated. This evaluation is performed by varying the minimum RTO, EWMA parameters, and multiplier of variance RTT against different content popularity distribution gains. The obtained results are used to reconsider the Jacobson algorithm for accurately estimating RTO in CCN. Comparing the performance of the reconsidered Jacobson estimator with the existing solutions shows that it can estimate RTO simply and more accurately without any additional information or computation overhead. 展开更多
关键词 Content-centric networking Retransnissi on timeout Popularity distribution gain Jacobson RTO estimator
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洁定HS6617蒸汽灭菌器POST.TIMEOUT故障维修3例 认领 引用 被引量：4
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作者 谢德斌 《医疗卫生装备》 CAS 2017年第6期158-160,共3页
0引言根据《消毒技术规范》要求,对使用过的手术器械包,除部分不耐高温的,一般采用压力蒸汽灭菌的方法进行灭菌处理。我院于2004年购入3台瑞典洁定HS6617蒸汽灭菌器,该灭菌器是基于压力蒸汽灭菌原理制造而成的,通过选择不同的应用程序,... 0引言根据《消毒技术规范》要求,对使用过的手术器械包,除部分不耐高温的,一般采用压力蒸汽灭菌的方法进行灭菌处理。我院于2004年购入3台瑞典洁定HS6617蒸汽灭菌器,该灭菌器是基于压力蒸汽灭菌原理制造而成的,通过选择不同的应用程序,可对大多数材料进行灭菌处理[1]。 展开更多
关键词 洁定HS6617蒸汽灭菌器 POST.TIMEOUT报警 故障维修
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铁路GSM-R通信中CRC漏检问题研究与优化建议 认领 引用
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作者 王春萌 张训望 +1 位作者 胥培鸿 刘忠慧 《铁道通信信号》 2026年第7期60-69,共10页
为解决CTCS-3级列控系统车地无线通信中因循环冗余校验(CRC)漏检引发的无线通信超时问题,保障高速铁路350 km/h运营下的行车安全与运输效率,以全路抽查的数千份无线超时分析报告中数百件发生在车载侧的CRC漏检故障数据为研究基础,统计分... 为解决CTCS-3级列控系统车地无线通信中因循环冗余校验(CRC)漏检引发的无线通信超时问题,保障高速铁路350 km/h运营下的行车安全与运输效率,以全路抽查的数千份无线超时分析报告中数百件发生在车载侧的CRC漏检故障数据为研究基础,统计分析CRC漏检引发的超时故障特征,阐明CRC漏检导致超时的机理,构建“隐性内容错误-显性内容错误”的CRC漏检分类框架并明确量化定性标准。从CRC校验原理出发,剖析铁路专用CRC-16的漏检机理及两类典型漏检现象,结合GSM-R网络硬切换特性,探究小区切换场景下错误数据生成的关键诱因,包括硬切换的复帧与偷帧机制、切换时的网络信道变化、信号质量波动,以及复杂无线环境等。通过四类典型“隐性内容错误”案例,分析错误数据的帧结构特征及成因。在此基础上,进一步设计车载侧“MT隐性错误源头防控”和“ATP显性错误前置筛选”两项优化建议,阐明方案原理、具体实现路径,以及优缺点,并设计二者的综合联动应用方案。研究结果表明:移动终端(MT)侧采用双窗口防控机制和ATP侧采用四层筛选逻辑可规避大部分CRC漏检后立即拆链的风险,联动方案采用“源头减错+后端筛选+容错兜底”的三重防控模式,有效降低因CRC漏检导致的无线通信超时概率,为提升CTCS-3级列控系统车地通信可靠性提供技术支撑,也为GSM-R网络在高速移动场景下的故障防控提供理论依据。 展开更多
关键词 CTCS-3级列控系统 CRC漏检 GSM-R网络 无线通信超时 小区硬切换 数据链路层 LAPDm协议
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Multi-segmented nanowires for vortex magnetic domain wall racetrack memory 认领 引用
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作者 M Al Bahri M Al Hinaai T Al Harthy 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第12期582-588,共7页
A vortex domain wall's(VW) magnetic racetrack memory's high performance depends on VW structural stability,high speed, low power consumption and high storage density. In this study, these critical parameters w... A vortex domain wall's(VW) magnetic racetrack memory's high performance depends on VW structural stability,high speed, low power consumption and high storage density. In this study, these critical parameters were investigated in magnetic multi-segmented nanowires using micromagnetic simulation. Thus, an offset magnetic nanowire with a junction at the center was proposed for this purpose. This junction was implemented by shifting one portion of the magnetic nanowire horizontally in the x-direction(l) and vertically(d) in the y-direction. The VW structure became stable by manipulating magnetic properties, such as magnetic saturation(M4) and magnetic anisotropy energy(Ku). In this case, increasing the values of M4 ≥ 800 kA/m keeps the VW structure stable during its dynamics and pinning and depinning in offset nanowires,which contributes to maintenance of the storage memory's lifetime for a longer period. It was also found that the VW moved with a speed of 500 m/s, which is desirable for VW racetrack memory devices. Moreover, it was revealed that the VW velocity could be controlled by adjusting the offset area dimensions(l and d), which helps to drive the VW by using low current densities and reducing the thermal-magnetic spin fluctuations. Further, the depinning current density of the VW(Jd) over the offset area increases as d increases and l decreases. In addition, magnetic properties, such as the M4 and Ku,can affect the depinning process of the VW through the offset area. For high storage density, magnetic nanowires(multisegmented) with four junctions were designed. In total, six states were found with high VW stability, which means three bits per cell. Herein, we observed that the depinning current density(Jd) for moving the VW from one state to another was highly influenced by the offset area geometry(l and d) and the material's magnetic properties, such as the M4 and Ku. 展开更多
关键词 micromagnetic simulation vortex domain wall racetrack memory multi-segmented magnetic nanowire spin transfer torque
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A two-parameter multiple shooting method and its application to the natural vibrations of non-prismatic multi-segment beams 认领 引用
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作者 R.HOŁUBOWSKI K.JARCZEWSKA 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第12期2243-2252,共10页
This paper presents an enhanced version of the standard shooting method that enables problems with two unknown parameters to be solved.A novel approach is applied to the analysis of the natural vibrations of Euler-Ber... This paper presents an enhanced version of the standard shooting method that enables problems with two unknown parameters to be solved.A novel approach is applied to the analysis of the natural vibrations of Euler-Bernoulli beams.The proposed algorithm,named as two-parameter multiple shooting method,is a new powerful numerical tool for calculating the natural frequencies and modes of multi-segment prismatic and non-prismatic beams with different boundary conditions.The impact of the axial force and additional point masses is also taken into account.Due to the fact that the method is based directly on the fourth-order ordinary differential equation,the structures do not have to be divided into many small elements to obtain an accurate enough solution,even though the geometry is very complex.To verify the proposed method,three different examples are considered,i.e.,a three-segment non-prismatic beam,a prismatic column subject to non-uniformly distributed compressive loads,and a two-segment beam with an additional point mass.Numerical analyses are carried out with the software MATHEMATICA.The results are compared with the solutions computed by the commercial finite element program SOFiSTiK.Good agreement is achieved,which confirms the correctness and high effectiveness of the formulated algorithm. 展开更多
关键词 two-parameter multiple shooting method two-point boundary value problem natural vibration non-prismatic beam multi-segment beam
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