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Blumlein型宽平顶长脉冲形成网络研究 被引量:10
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作者 夏连胜 戴光森 +1 位作者 李远 章林文 《高电压技术》 EI CAS CSCD 北大核心 2001年第3期45-46,49,共3页
介绍了 Blum lein型低阻抗脉冲形成网络并研究了网络元件标称值偏离真实值对输出脉冲的影响。研究和实验结果表明 ,采用 Blumlein结构脉冲形成网络 ,可获得输出电压幅度等于充电电压的脉冲输出 ,脉冲电流达数 k A,脉冲平顶纹波波动 <... 介绍了 Blum lein型低阻抗脉冲形成网络并研究了网络元件标称值偏离真实值对输出脉冲的影响。研究和实验结果表明 ,采用 Blumlein结构脉冲形成网络 ,可获得输出电压幅度等于充电电压的脉冲输出 ,脉冲电流达数 k A,脉冲平顶纹波波动 <± 1% ;当元件的真实值偏离标称值 5 %以内时对脉冲平顶的影响可以忽略。 展开更多
关键词 Blumlein型宽顶长脉冲形成网络 充电电压 脉冲输出
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基于北斗星间链路闭环残差检测的星间钟差平差改正 被引量:3
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作者 刘成 高为广 +6 位作者 潘军洋 唐成盼 胡小工 王威 陈颖 卢鋆 宿晨庚 《测绘学报》 EI CSCD 北大核心 2020年第9期1149-1157,共9页
利用“闭环检测”思想检测和修正系统测量累积误差,是工程科学中的常用和有效手段。本文指出了北斗三号系统全球星间链路中所存在的有利闭环条件,并提出一种利用其进行闭合残差检测与分析的方法。在此基础上,构建了闭合残差整网平差模型... 利用“闭环检测”思想检测和修正系统测量累积误差,是工程科学中的常用和有效手段。本文指出了北斗三号系统全球星间链路中所存在的有利闭环条件,并提出一种利用其进行闭合残差检测与分析的方法。在此基础上,构建了闭合残差整网平差模型,实现了对北斗三号卫星星间相对钟差的误差修正。基于在轨实测数据的计算表明,北斗三号系统全球星间链路中确实存在着明显的常数性或周期性非零闭合残差。通过对星间链路闭环残差的平差修正,基本消除了卫星星间钟差不闭合的现象,减少星间钟差随机噪声30%~50%,有效提高了星间相对钟差测定的精度,有利于提升北斗系统服务能力。 展开更多
关键词 北斗 星间链路 星间钟差 闭合残差 网络平
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便携式激光盘煤系统原理及应用 被引量:8
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作者 熊友辉 李培生 +1 位作者 邹显宏 蒋泰毅 《中国电力》 CSCD 北大核心 2003年第6期48-51,共4页
在分析以往各种盘煤技术优缺点的基础上,提出一种新型的便携式激光盘煤系统。通过采用无棱镜激光测距仪及数字角度编码器技术,更适合燃煤电厂具有强磁场干扰的场合。本系统数据采集软件基于WindowsCE掌上电脑软件,更适合现场使用,并使... 在分析以往各种盘煤技术优缺点的基础上,提出一种新型的便携式激光盘煤系统。通过采用无棱镜激光测距仪及数字角度编码器技术,更适合燃煤电厂具有强磁场干扰的场合。本系统数据采集软件基于WindowsCE掌上电脑软件,更适合现场使用,并使用了网络平差技术,确保了盘煤结果的准确性。通过掌上电脑的数据传输,PC室内处理软件可计算面积、体积等参数,同时可形成3D立体图及三角网图,此外本系统煤质信息与空间坐标的耦合,可快速显示煤种在煤堆中的分布状况。 展开更多
关键词 煤堆 激光盘煤 WINDOWS CE 三维图形 网络平
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海上多源多缆地震采集综合导航定位数据处理技术 被引量:9
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作者 张振波 王征 +2 位作者 董水利 麻志国 屈超银 《石油物探》 EI CSCD 北大核心 2013年第6期630-635,3,共6页
目前海上三维地震勘探主要以多缆采集为主,对地震船、震源和拖缆等设备进行全方位的精确定位是确保高精度地震采集资料品质的关键所在。介绍了海上多源多缆地震采集综合导航定位网络的配置及其质量评价标准;根据现场工作经验总结提出了... 目前海上三维地震勘探主要以多缆采集为主,对地震船、震源和拖缆等设备进行全方位的精确定位是确保高精度地震采集资料品质的关键所在。介绍了海上多源多缆地震采集综合导航定位网络的配置及其质量评价标准;根据现场工作经验总结提出了一套海上拖缆地震采集综合导航定位数据实时处理和质量控制流程;详细论述了定位数据预处理和网络平差等关键技术环节以及必须把握的准则;进一步讨论了综合导航定位数据现场实时处理可以同时起到的定位参数设置检查修正和水下设备故障分析判断作用。 展开更多
关键词 导航数据处理 多源多缆地震采集 综合导航定位 定位网络配置 网络平
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安全教育要实做更要善做
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作者 姚跃林 《考试(高考文科版)》 2015年第27期1-1,共1页
安全教育乍看上去是"虚功",但实际上既是安全管理的途径之一,也是保障有效管理的必要前提。有调查表明,安全事故发生多源于安全意识不强、安全管理松弛等人为因素。加强安全教育,能够有效预防和减少安全事故特别是人身伤害事... 安全教育乍看上去是"虚功",但实际上既是安全管理的途径之一,也是保障有效管理的必要前提。有调查表明,安全事故发生多源于安全意识不强、安全管理松弛等人为因素。加强安全教育,能够有效预防和减少安全事故特别是人身伤害事故的发生。故不能视安全教育为"虚功",必须将安全教育落到实处。随着学校管理日益规范化,安全工作已摆在头等重要的位置。如今。 展开更多
关键词 人身伤害事故 人为因素 学校管理 教育对象 主体错位 责任风险 目标人群 儿童心理 商业网站 网络平
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拖缆综合导航数据后处理质量控制 被引量:2
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作者 陈昌旭 周滨 +3 位作者 张建峰 李江 王志亮 吴尧 《内蒙古石油化工》 CAS 2016年第10期-,共5页
在海上拖缆采集作业中,电缆形状和位置的计算有着重要的意义。在实时导航时,需要它显示共中心点位置、控制面元覆盖和判断电缆水下状态;在导航数据后处理时,需要依靠它计算电缆各检波点的位置。海上施工中,由于天气状况不佳、定位信号... 在海上拖缆采集作业中,电缆形状和位置的计算有着重要的意义。在实时导航时,需要它显示共中心点位置、控制面元覆盖和判断电缆水下状态;在导航数据后处理时,需要依靠它计算电缆各检波点的位置。海上施工中,由于天气状况不佳、定位信号不稳、设备通讯问题和躲避障碍物等原因,原始的定位导航数据会记录一些突变的或者错误的数据,不能直接使用。必须对原始数据进行后处理,得到更加合理准确的定位数据,并根据产生的相关质控数据对施工质量进行监控。本文结合海上多个拖缆采集作业实例,深入分析了综合导航后处理的流程和参数选择原则,提出了质量控制的关键点,具有一定的借鉴和推广价值。 展开更多
关键词 拖缆采集 综合导航数据 网络平 点位精度 质量控制
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南京体育学院大学计算机信息技术基础教学的现状及对策 被引量:1
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作者 叶强 许帆 +5 位作者 蒋乘龙 马东方 苏杨 魏宁 谢红 喻欣楠 《南京体育学院学报(自然科学版)》 2012年第4期3-6,共4页
通过对南京体育学院大学计算机信息基础教学现状进行网络问卷调查。调查针对教学常见问题,使用EnableQ网络调查系统对365名南京体育学院本科学生进行问卷调查。结果体现出课程教学比较重视基础,缺少深层次的教学和指导,信息意识薄弱,信... 通过对南京体育学院大学计算机信息基础教学现状进行网络问卷调查。调查针对教学常见问题,使用EnableQ网络调查系统对365名南京体育学院本科学生进行问卷调查。结果体现出课程教学比较重视基础,缺少深层次的教学和指导,信息意识薄弱,信息处理能力不强,有4.2%的学生具有网络成瘾现象,需引起关注。讨论和结论认为大学计算机信息技术基础课程内容应注重与体育领域应用结合,体现出体育院校的特殊性,课程教学应注重学生养成良好信息素养培育,并需加强课外教学和网络教学平台建设,实现全面育人的目标。 展开更多
关键词 大学计算机信息技术基础 教学 信息素养 网络教学
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Design and Implementation of an Open Network Security Management Platform 被引量:2
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作者 曹元大 王勇 《Journal of Beijing Institute of Technology》 EI CAS 2002年第3期316-320,共5页
In order to manage all kinds of network security devices and software systems efficiently, and make them collaborate with each other, the model for an open network security management platform is presented. The feasib... In order to manage all kinds of network security devices and software systems efficiently, and make them collaborate with each other, the model for an open network security management platform is presented. The feasibility and key implementing technology of the model are expatiated. A prototype system is implemented to validate it. 展开更多
关键词 network security management open platform XML RPC SNMP
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Dynamic load balancing based on restricted multicast tree in triplet-based hierarchical interconnection network
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作者 刘滨 石峰 +2 位作者 高玉金 计卫星 宋红 《Journal of Southeast University(English Edition)》 EI CAS 2008年第1期33-37,共5页
To solve the load balancing problem in a triplet-based hierarchical interconnection network(THIN) system, a dynamic load balancing (DLB)algorithm--THINDLBA, which adopts multicast tree (MT)technology to improve ... To solve the load balancing problem in a triplet-based hierarchical interconnection network(THIN) system, a dynamic load balancing (DLB)algorithm--THINDLBA, which adopts multicast tree (MT)technology to improve the efficiency of interchanging load information, is presented. To support the algorithm, a complete set of DLB messages and a schema of maintaining DLB information in each processing node are designed. The load migration request messages from the heavily loaded node (HLN)are spread along an MT whose root is the HLN. And the lightly loaded nodes(LLNs) covered by the MT are the candidate destinations of load migration; the load information interchanged between the LLNs and the HLN can be transmitted along the MT. So the HLN can migrate excess loads out as many as possible during a one time execution of the THINDLBA, and its load state can be improved as quickly as possible. To avoid wrongly transmitted or redundant DLB messages due to MT overlapping, the MT construction is restricted in the design of the THINDLBA. Through experiments, the effectiveness of four DLB algorithms are compared, and the results show that the THINDLBA can effectively decrease the time costs of THIN systems in dealing with large scale computeintensive tasks more than others. 展开更多
关键词 triplet-based hierarchical interconnection network dynamic load balancing multicast tree
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Alloy gene Gibbs energy partition function and equilibrium holographic network phase diagrams of Au_3Cu-type sublattice system 被引量:3
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作者 谢佑卿 聂耀庄 +2 位作者 李小波 彭红建 刘心笔 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第1期211-240,共30页
Taking Au3Cu-type sublattice system as an example, three discoveries have been presented. First, the fourth barrier to hinder the progress of metal materials science is that today’s researchers do not understand that... Taking Au3Cu-type sublattice system as an example, three discoveries have been presented. First, the fourth barrier to hinder the progress of metal materials science is that today’s researchers do not understand that the Gibbs energy function of an alloy phase should be derived from Gibbs energy partition function constructed of alloy gene sequence and their Gibbs energy sequence. Second, the six rules for establishing alloy gene Gibbs energy partition function have been discovered, and it has been specially proved that the probabilities of structure units occupied at the Gibbs energy levels in the degeneracy factor for calculating configuration entropy should be degenerated as ones of component atoms occupied at the lattice points. Third, the main characteristics unexpected by today’s researchers are as follows. There exists a single-phase boundary curve without two-phase region coexisting by the ordered and disordered phases. The composition and temperature of the top point on the phase-boundary curve are far away from those of the critical point of the Au3Cu compound; At 0 K, the composition of the lowest point on the composition-dependent Gibbs energy curve is notably deviated from that of the Au3Cu compounds. The theoretical limit composition range of long range ordered Au3Cu-type alloys is determined by the first jumping order degree. 展开更多
关键词 Au3Cu compound Au3Cu-type sublattice system alloy gene Gibbs energy partition function equilibrium holographic network phase diagrams systematic metal materials science
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Alloy gene Gibbs energy partition function and equilibrium holographic network phase diagrams of AuCu_3-type sublattice system 被引量:3
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作者 谢佑卿 李小波 +2 位作者 刘心笔 聂耀庄 彭红建 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3585-3610,共26页
Taking AuCu3-type sublattice system as an example, three discoveries have been presented: First, the third barrier hindering the progress in metal materials science is that researchers have got used to recognizing exp... Taking AuCu3-type sublattice system as an example, three discoveries have been presented: First, the third barrier hindering the progress in metal materials science is that researchers have got used to recognizing experimental phenomena of alloy phase transitions during extremely slow variation in temperature by equilibrium thinking mode and then taking erroneous knowledge of experimental phenomena as selected information for establishing Gibbs energy function and so-called equilibrium phase diagram. Second, the equilibrium holographic network phase diagrams of AuCu3-type sublattice system may be used to describe systematic correlativity of the composition?temperature-dependent alloy gene arranging structures and complete thermodynamic properties, and to be a standard for studying experimental subequilibrium order-disorder transition. Third, the equilibrium transition of each alloy is a homogeneous single-phase rather than a heterogeneous two-phase, and there exists a single-phase boundary curve without two-phase region of the ordered and disordered phases; the composition and temperature of the top point on the phase-boundary curve are far away from the ones of the critical point of the AuCu3 compound. 展开更多
关键词 AuCu3 compound AuCu3-type sublattice system alloy gene Gibbs energy partition function equilibrium holographic network phase diagram systematic metal materials science
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Holographic alloy positioning design system and holographic network phase diagrams of Au-Cu system 被引量:3
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作者 谢佑卿 刘心笔 +2 位作者 李小波 彭红建 聂耀庄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第3期885-906,共22页
Taking Au?Cu system as an example, three discoveries and two methods were presented. First, a new way for boosting sustainable progress of systematic metal materials science (SMMS) and alloy gene engineering (AGE) is ... Taking Au?Cu system as an example, three discoveries and two methods were presented. First, a new way for boosting sustainable progress of systematic metal materials science (SMMS) and alloy gene engineering (AGE) is to establish holographic alloy positioning design (HAPD) system, of which the base consists of measurement and calculation center, SMMS center, AGE center, HAPD information center and HAPD cybernation center; Second, the resonance activating-sychro alternating mechanism of atom movement may be divided into the located and oriented diffuse modes; Third, the equilibrium and subequilibrium holographic network phase diagrams are blueprints and operable platform for researchers to discover, design, manufacture and deploy advanced alloys, which are obtained respectively by the equilibrium lever numerical method and cross point numerical method of isothermal Gibbs energy curves. As clicking each network point, the holographic information of three structure levels for the designed alloy may be readily obtained: the phase constitution and fraction, phase arranging structure and properties of organization; the composition, alloy gene arranging structure and properties of each phase and the electronic structures and properties of alloy genes. It will create a new era for network designing advanced alloys. 展开更多
关键词 Au-Cu system holographic alloy positioning design system equilibrium and subequilibrium holographic network phase diagrams systematic metal materials science network designing advanced alloys
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New atom movement mechanism for tracking path on disordering AuCuI(A_8^(Au)A_4^(Cu)) compound 被引量:3
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作者 谢佑卿 彭红建 +2 位作者 刘心笔 李小波 聂耀庄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3221-3256,共36页
Taking experimental path on disordering AuCuI(AAuCu8A4)composed of A Au8 and ACu4 stem alloy genes as an example, three discoveries and a method were presented. The ability of Au Cu I(AAu Cu8 A4)to keep structure ... Taking experimental path on disordering AuCuI(AAuCu8A4)composed of A Au8 and ACu4 stem alloy genes as an example, three discoveries and a method were presented. The ability of Au Cu I(AAu Cu8 A4)to keep structure stabilization against changing temperature is attributed to the fact that the AAu8 and ACu4 potential well depths greatly surpass their vibration energies, which leads to the subequilibrium of experimental path. A new atom movement mechanism of AuCuI(AAuACu84)to change structure for suiting variation in temperature is the resonance activating-synchro alternating of alloy genes, which leads to heterogeneous and successive subequilibrium transitions. There exists jumping order degree, which leads to the existence of jumping Tj-temperature and an unexpected so-called "retro-effect" about jumping temperature retrograde shift to lower temperatures upon the increasing heating rate. A set of subequilibrium holographic network path charts were obtained by the experimental mixed enthalpy path method. 展开更多
关键词 INTERMETALLICS alloy gene order/disorder transformation resonance activating-synchro alternating mechanism thermodynamic properties equilibrium and subequilibrium holographic network path charts
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加强礼仪教育 迎接人文奥运
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作者 黄琳 《科教文汇》 2008年第10期18-19,共2页
在人文奥运行动的落实方面,"礼仪"被视为了首要突破口。文章分析了现代奥运礼仪的含义及其对人文奥运的积极促进作用,认为现代奥运礼仪是人文奥运的具体体现,是世界各国人民之间、队员与观众之间联络感情,促进沟通、了解的桥... 在人文奥运行动的落实方面,"礼仪"被视为了首要突破口。文章分析了现代奥运礼仪的含义及其对人文奥运的积极促进作用,认为现代奥运礼仪是人文奥运的具体体现,是世界各国人民之间、队员与观众之间联络感情,促进沟通、了解的桥梁,有助于加强公民的思想道德建设,有助于提高中国文化的国际软竞争力。最后提出加强奥运礼仪教育的对策思路,包括高度重视奥运礼仪的重要性,坚开展系列奥运礼仪活动,充分调动群众参与奥运礼仪建设的积极性,在全国学生中广泛开展加强奥运礼仪教育等。 展开更多
关键词 人文奥运 现代奥运礼仪 软竞争力 网络平 民族性
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新型城市需要创新人才——浙江大学初步建立起创新人才培养体系
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《杭州(生活品质)》 2008年第Z1期145-145,共1页
【简介】创新型人才的培养既是社会、经济和谐发展的需要,是一座城市提高生活品质的要义,也是是新时期教育的重要使命。杭城高等教育日益重视培养创新型人才,各项围绕培养创新人才的教育改革工作如火如荼地开展,为杭州市培养和输送了大... 【简介】创新型人才的培养既是社会、经济和谐发展的需要,是一座城市提高生活品质的要义,也是是新时期教育的重要使命。杭城高等教育日益重视培养创新型人才,各项围绕培养创新人才的教育改革工作如火如荼地开展,为杭州市培养和输送了大量优秀人才。浙江大学秉承求是精神,锐意创新,不断探索创新人才培养模式,形成了创新人才理念,从培养目标、专业、课程、教学方法等方面探索创新人才培养模式、初步建立起具有特色的研究型大学创新人才教育教学体系。 展开更多
关键词 教育教学体系 新时期教育 和谐发展 教育改革 大学本科 挑战杯 教育模式 教学方法 成果展示 网络平
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龙门中学青年教师专业发展的研究
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作者 朱国全 《考试(高考文科版)》 2015年第19期76-77,共2页
广东省龙门县龙门中学是一所山区重点高中,2014年2月,被评为广东省国家级示范性普通高中。学校的教师群体中青年教师所占比例较高,青年教师是学校未来的希望,也是学校的核心竞争力。因此,青年教师的专业的发展,应作为学校重中之重的工... 广东省龙门县龙门中学是一所山区重点高中,2014年2月,被评为广东省国家级示范性普通高中。学校的教师群体中青年教师所占比例较高,青年教师是学校未来的希望,也是学校的核心竞争力。因此,青年教师的专业的发展,应作为学校重中之重的工作来进行谋划。学校采取一些措施,使这支队伍迅速成长成熟和发展。加强建设,推动青年教师的师德专业发展"德高为范" 展开更多
关键词 青年教师 龙门县 教师形象 示范性普通高中 德高为范 一所 教育发展形势 发展区 教育专业化 网络平
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浅析大学物理实验教学改革思路
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作者 刘静 《科教导刊(电子版)》 2016年第32期60-60,共1页
本文从基地建设、实验教学内容体系建设、开放式网络化信息平台建设、先进的教学模式与科学的教学方法的有机结合等几个方面,论述大学物理实验教学的改革思路,其结果对高等教育大学物理实验教学改革有重要参考价值。
关键词 创新基地 网络化信息台 教学模式 改革
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Hybrid-Traffic-Detour Based Load Balancing for Onboard Routing in LEO Satellite Networks 被引量:11
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作者 Peilong Liu Hongyu Chen +2 位作者 Songjie Wei Limin Li Zhencai Zhu 《China Communications》 SCIE CSCD 2018年第6期28-41,共14页
To deal with the dynamic and imbalanced traffic requirements in Low Earth Orbit satellite networks, several distributed load balancing routing schemes have been proposed. However, because of the lack of global view, t... To deal with the dynamic and imbalanced traffic requirements in Low Earth Orbit satellite networks, several distributed load balancing routing schemes have been proposed. However, because of the lack of global view, these schemes may lead to cascading congestion in regions with high volume of traffic. To solve this problem, a Hybrid-Traffic-Detour based Load Balancing Routing(HLBR) scheme is proposed, where a Long-Distance Traffic Detour(LTD) method is devised and coordinates with distributed traffic detour method to perform self-adaptive load balancing. The forwarding path of LTD is acquired by the Circuitous Multipath Calculation(CMC) based on prior geographical information, and activated by the LTDShift-Trigger(LST) through real-time congestion perception. Simulation results show that the HLBR can mitigate cascading congestion and achieve efficient traffic distribution. 展开更多
关键词 satellite networks load balancing cascading congestion traffic detour
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Comprehensive Analysis and Artificial Intelligent Simulation of Land Subsidence of Beijing, China 被引量:7
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作者 ZHU Lin GONG Huili +3 位作者 LI Xiaojuan LI Yongyong SU Xiaosi GUO Gaoxuan 《Chinese Geographical Science》 SCIE CSCD 2013年第2期237-248,共12页
Mechanism and modeling of the land subsidence are complex because of the complicate geological background in Beijing, China. This paper analyzed the spatial relationship between land subsidence and three factors, incl... Mechanism and modeling of the land subsidence are complex because of the complicate geological background in Beijing, China. This paper analyzed the spatial relationship between land subsidence and three factors, including the change of groundwater level, the thickness of compressible sediments and the building area by using remote sensing and GIS tools in the upper-middle part of alluvial-proluvial plain fan of the Chaobai River in Beijing. Based on the spatial analysis of the land subsidence and three factors, there exist significant non-linear relationship between the vertical displacement and three factors. The Back Propagation Neural Network (BPN) model combined with Genetic Algorithm (GA) was used to simulate regional distribution of the land subsidence. Results showed that at field scale, the groundwater level and land subsidence showed a significant linear relationship. However, at regional scale, the spatial distribution of groundwater depletion funnel did not overlap with the land subsidence funnel. As to the factor of compressible strata, the places with the biggest compressible strata thickness did not have the largest vertical displacement. The distributions of building area and land subsidence have no obvious spatial relationships. The BPN-GA model simulation results illustrated that the accuracy of the trained model during fifty years is acceptable with an error of 51% of verification data less than 20 mm and the average of the absolute error about 32 mm. The BPN model could be utilized to simulate the general distribution of land subsidence in the study area. Overall, this work contributes to better understand the complex relationship between the land subsidence and three influencing factors. And the distribution of the land subsidence can be simulated by the trained BPN-GA model with the limited available dada and acceptable accuracy. 展开更多
关键词 land subsidence groundwater level change compressible sediments thickness building area Back Propagation NeuralNetwork and Genetic Algorithm (BPN-GA) model
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Stability Analysis of Cohen-Grossberg Neural Networks with Time-Varying Delays 被引量:1
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作者 刘艳青 唐万生 《Transactions of Tianjin University》 EI CAS 2007年第1期12-17,共6页
The global exponential stability of Cohen-Grossberg neural networks with time-varying delays is studied. By constructing several suitable Lyapunov functionals and utilizing differential in-equality techniques, some su... The global exponential stability of Cohen-Grossberg neural networks with time-varying delays is studied. By constructing several suitable Lyapunov functionals and utilizing differential in-equality techniques, some sufficient criteria for the global exponential stability and the exponential convergence rate of the equilibrium point of the system are obtained. The criteria do not require the activation functions to be differentiable or monotone nondecreasing. Some stability results from previous works are extended and improved. Comparisons are made to demonstrate the advantage of our results. 展开更多
关键词 Cohen-Grossberg neural networks time-varying delay equilibrium point global exponential stability convergence rate
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