On w-Linked Overrings

Let R ■ T be an extension of commutative rings.T is called w-linked over R if T as an R-module is a w-module.In the case of R ■ T ■ Q 0 （R）,T is called a w-linked overring of R.As a generalization of Wang-McCsland-Park-Chang Theorem,we show that if R is a reduced ring,then R is a w-Noetherian ring with w-dim（R） 1 if and only if each w-linked overring T of R is a w-Noetherian ring with w-dim（T ） 1.In particular,R is a w-Noetherian ring with w-dim（R） = 0 if and only if R is an Artinian ring.

一种基于KVM OVER IP的通信专业智能化集中运维方式

随着运营线路的增多,郑州地铁已进入网络化运营的新阶段,对设备的日常维护也提出了更高的要求,通信专业设备众多,更需要通过智能运维来满足网络化运营的新要求。本文基于车站、控制中心的通信设备的维护现状,通过研究通信专业智能化集中运维方式,优化日常运维场景、故障处理场景、抢险抢修场景下人员分工和生产方式,提出新的基于KVM OVER IP的设备管理架构和运维模式,在不影响现网正常稳定运行、投资成本不高的情况下,实现地铁通信专业设备的集中化、智能化维护,进一步提升设备管理维护水平,同时为下一步建设网管网奠定基石,最终可轻松实现业务、管理2张网运行,结合大数据技术亦可实现地铁通信设备的智能监测、智能分析、智能维护,最大化的增加经济效益。

A Likelihood-Based Multiple Change Point Algorithm for Count Data with Allowance for Over-Dispersion

Count data is almost always over-dispersed where the variance exceeds the mean. Several count data models have been proposed by researchers but the problem of over-dispersion still remains unresolved, more so in the context of change point analysis. This study develops a likelihood-based algorithm that detects and estimates multiple change points in a set of count data assumed to follow the Negative Binomial distribution. Discrete change point procedures discussed in literature work well for equi-dispersed data. The new algorithm produces reliable estimates of change points in cases of both equi-dispersed and over-dispersed count data;hence its advantage over other count data change point techniques. The Negative Binomial Multiple Change Point Algorithm was tested using simulated data for different sample sizes and varying positions of change. Changes in the distribution parameters were detected and estimated by conducting a likelihood ratio test on several partitions of data obtained through step-wise recursive binary segmentation. Critical values for the likelihood ratio test were developed and used to check for significance of the maximum likelihood estimates of the change points. The change point algorithm was found to work best for large datasets, though it also works well for small and medium-sized datasets with little to no error in the location of change points. The algorithm correctly detects changes when present and fails to detect changes when change is absent in actual sense. Power analysis of the likelihood ratio test for change was performed through Monte-Carlo simulation in the single change point setting. Sensitivity analysis of the test power showed that likelihood ratio test is the most powerful when the simulated change points are located mid-way through the sample data as opposed to when changes were located in the periphery. Further, the test is more powerful when the change was located three-quarter-way through the sample data compared to when the change point is closer (quarter-way) to the first observation.

视听翻译模式Voice-over的研究综述

本文聚焦视听翻译模式Voice-over,分析了国内外发表于翻译研究相关学术期刊上的相关学术论文,探讨国内外Voice-over模式的具体概念、发展阶段与应用领域等问题,认为国内外翻译研究界对Voice-over这一视听翻译模式的整体关注度不高,但近年来有增强的趋势;该模式除了应用于视听翻译领域外,开始应用于其他领域;学科意识逐渐增强,呈现多学科互相促进之势。本文对Voice-over模式的发展阶段、分类研究与国内研究现状做出了整理,以期为国内该模式的研究发展有所助益。

基于空中计算CoMAC架构的不同计算场景叠加符号判决算法

本文研究不同场景下基于空中计算的多址信道计算(CoMAC)架构的覆盖符号决策算法。首先,从理论上分析了XOR、ADD、MOD三种场景中加性高斯白噪声(AWGN)多址接入信道下叠加符号的概率密度分布,提出了一种基于先验概率的最优门限判决策略。其次,推导了系统最优门限及对应误码率的理论表达式。最后,通过仿真验证了不同信噪比、传感器节点个数及先验概率对于该门限判决方案的鲁棒性和可靠性的影响。与通信计算相分离的传统方案相比,空中计算判决方案具有更好的检测性能,为多址接入信道下的信号识别提供了新的参考方案。

Spatial structure evolution of overlying strata and inducing mechanism of rockburst in coal mine

Spatial structure of overlying strata existed and evolved dynamically with the exploitation scope （boundary conditions） changes in coal mines and to induce rockburst. Based on the“key strata”theory, the integrated spatial structure of overlying strata was put forward, which was composed of “O-X” structure in the plane section and “F” structure in the vertical section. The formation and ongoing instability of the“O-X”and“F”structures were called as dynamic evolution cycle of the overlying strata. Three basic categories of “O-X”, “F” and “T” structures were defined, and the strata behaviors of each spatial structure were analyzed. According to energy theory, mechanism of rockburst induced by spatial structure instability was discussed. The research expanded the scope of traditional ground pressure theory and provided a guide for the prevention of rockburst and mining tremors induced by structure instability of overlying

Bioturbation Effects of Benthic Fish on the Phosphorus Dynamic in Overlying Water of Paddy Field

[Objective]The research aimed to investigate the bioturbation effects of benthic fish Misgurnus anguillicaudatus on phosphorus dynamic in overlying water of paddy field,as well as to explore the bioturbation mechanism.[Method]Based on simulation experiment,the phosphorus contents in overlying water were analyzed comparatively with and without Misgurnus anguillicaudatus by the using of ion chromatography and spectrophotometry.[Result]The concentrations of total phosphorus(TP),dissolved total phosphorus(DTP)and particular phosphorus(PP)in bioturbation group had no significant differences with those in control group in initial stage of experiment,and became significantly higher than control group in middle and late stages of experiment(P<0.05). The PP/TP ratios in bioturbation group were bigger than those in control group,the increase of TP concentration in bioturbation group was mainly due to the increase of PP. The ratios of dissolved inorganic phosphorus(DIP) to DTP (DIP/DTP) were significantly bigger than those in control group in middle and late stages of experiment(P<0.05).[Conclusion]The benthic fish had bioturbation effects on phosphorus in overlying water of paddy field,which increased the available phosphorus for rice growth.

利用Push-over方法评价桥梁的抗震安全性

建立了桥梁破损极限状念的定量准则，对Pusn－over方法涉及的若干技术环节，包括约束钢筋混凝土截面弯矩曲车关系、位移延性系数与曲李延性系数的关系以及评价反应谱进行了分析，并给出了一个利用Push－over方法评价桥梁抗震安个性的应用实例。

一种基于UDP的IPv4 over IPv6的隧道方案

从IPv4向IPv6过渡,需要解决IPv4网络和IPv6网络之间的互联互通问题。为实现通过IPv6连接IPv4孤岛,利用IPv6高带宽的特点提出一种基于UDP协议的处理简单、处理开销小的IPv4overIPv6隧道过渡方案BoIP。描述BoIP工作原理和具体实现,实验床测试结果表明,BoIP可以实现两个IPv4局域网通过IPv6网络透明连接。

TCP over ATM的拥塞控制研究进展

指出了TCP／IP在ATM网络中运行遇到的困难，综述了TCP拥塞控制方案与ATM层拥塞控制策略的进展，概述了TCPoverATM研究的现状，指出了将来的工作方向。

IP over CCSDS网关TCP增强关键技术研究

随着空间通信系统的发展,CCSDS建议逐渐成为了空间通信的标准,特别是IP over CCSDS Space Links红皮书提出以后,IP已经成为空间信息系统的标准上层应用。提出了一种天地通信系统CCSDS加速网关的设计实现方法,介绍了基于加速网关的天地通信网络结构,描述了其关键技术实现,最后对提出的设计实现方法在OPNET中进行了仿真验证。OPNET仿真结果表明,该技术大大提高了TCP应用在空间链路上的传输效率,而且在多连接共享带宽时保持了较好的公平性。

支持双协议栈的IP over DVB-S网关系统

IPoverDVB是实现IP数据广播的关键技术,ULE是其最新的封装协议。以卫星网为背景,阐述了IPoverDVB-S转换网关系统设计和实现的关键技术。该网关兼容支持IPv4/IPv6双协议、MPE/ULE2种封装方式,给出了其在远程教育中的典型应用。对其它数据广播网关的设计与应用具有参考价值。

IPv6 over DVB在远程教育中的应用

构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范"3个部分。实现了将IPv6互联网中的教育资源通过卫星链路发布到目前尚无网络覆盖的1000所农牧村中小学。给出了设计方案和部署策略。

抗震结构静力弹塑性分析(Push-over)方法的研究进展

论述了 Push- over方法的基本原理 ,详细分析了 Push- over方法的研究现状和最新研究进展 ,对该方法未来发展中的主要问题提出了一些看法。

半刚性端板连接多层钢框架的Push-over分析

由于缺乏计算理论和方法,大多数半刚性节点按刚性节点进行设计,对结构的静力分析、抗震性能等各方面的设计计算的影响很大.本文采用有限元分析方法,将半刚性连接节点视为弹簧单元,通过通用有限元软件Sap2000对一个半刚性端板连接的多层钢框架建立有限元模型并进行了模态分析、反应谱分析和Push-over(静力弹塑性)分析.结果表明,采用了半刚性端板连接的钢框架结构,相对于理想刚接的情况,结构在多遇和罕遇地震作用下结构的抗震性能明显变化.

IP over WDM网络中可恢复的路由选择策略与算法

研究了IPoverWDM网络中各层备用资源的分配问题 ,提出了一种新的IPoverWDM网络中可恢复的路由选择策略以及应用于其中的备用路由选择算法 该策略通过层间备用资源共享 ,能够完全利用网络中为恢复光层故障所预留的资源来进行IP层故障恢复 ,从而大大提高了网络的资源利用率 对所提出的策略进行了性能分析 。

基于TCP OVER UDP技术的机器人遥操作系统中视频传输的研究

针对机器人遥操作系统中采用传统网络传输协议传输实时数据的局限性,比较分析TCP和UDP协议的传输特点,提出了在UDP协议上传输TCP服务的TCPOVERUDP技术,详细阐述了TCPOVERUDP技术的实现细节,在应用层实现了TCPOVERUDP传输技术,并把TCPOVERUDP技术应用到机器人遥操作系统的视频传输中。实验结果表明TCP OVER UDP技术在降低视频数据传输丢包率和传输时延两个方面都具有良好的性能。

IP over CCSDS协议转换技术研究

当前空间通信的发展趋势是空间通信网与地面通信网融合,建立天地一体化的信息传输系统。针对天地一体化信息传输系统中IP over CCSDS网关中的协议转换技术开展研究,参考了IP over CCSDS Space Links等相关建议,在Linux内核的网络协议栈中实现了IP协议与CCSDS AOS空间数据链路协议的相互转换,并通过试验对在CCSDS-AOS空间数据链路之上进行IP传输进行了测试与验证,表明了利用IP over CCSDS网关构建天地一体化信息传输系统的可行性,并给出了工程应用的实现建议。

基于模态分析的Push-over方法在桥梁抗震分析中的应用

采用非线性时程分析是计算结构地震响应较为严格的分析方法,但它存在工作量大、计算复杂等问题。目前土木工程中常采用非线性的静力分析(Push-over分析)来评价在地震作用下结构的抗震性能。均匀分布、倒三角形分布的侧向荷载分布模式,适用于刚度大或第一阶振型为主的结构,为了考虑高阶振型的影响,本文提出了基于模态分析的Push-over方法,并将其应用到桥梁抗震分析中。这种方法需要分析结构的动力特性,尤其是振型贡献率。选出振型贡献率比较高的振型,并以此为基础,依据“侧向荷载分布模式与地震时结构惯性力的分布情况应尽量保持一致”的原则,参考《公路工程抗震设计规范》(JTJ 004—89)可得到对应各振型的侧向荷载,在对主要振型进行组合后,即可获得进行Push-over分析的侧向荷载分布模式。本文采用基于模态分析的Push-over方法对一实桥进行抗震性能分析,结果表明选取主要振型参与计算与采用全部振型计算的结果基本吻合,不仅考虑了高阶振型的影响,又消除了其他次要振型的干扰,因此这种方法应用于桥梁抗震性能评价是可行的。

基于改进Inver-over算子的并行TSP演化算法

设计了基于近邻点初始化和改进Inver-over(反序杂交)算子求解旅行商问题的并行演化算法。该算法执行时,主进程每当收集到各个种群的最好个体并形成精英种群时,就对该种群执行一次Inver-over算子,然后将其中最好的个体发送给各个种群。在PVM(并行虚拟机)并行环境下的实验结果表明,并行后能取得更好的解,并且在主进程中建立精英种群的演化有助于更好更快的收敛。