IPv6技术应用与发展

本文首先对IPv6技术的规范形式、地址类型、寻址方式进行总结,对IPv6协议的特征与优势进行分析,对IPv6技术应用进行研究,对IPv6技术发展进行探讨。     

基于NS-2的移动IPv6切换协议的仿真

对移动rpv6切换协议HMIPv6、FMIPv6、F-HMIPv6进行了详细介绍;引入网络仿真工具NS-2,利用其对3种移动IPv6协议的切换性能进行了比较和仿真,验证了F-HMIPv6具有良好的性能.     

VC-6视频编码标准研究

本文对VC-6视频编码标准进行了研究,不仅研究了VC-6的三个重要特性(仅帧内编码、不进行变换编码、可以从单个文件以多种分辨率进行编辑),还研究了VC-6使用的S树编码等关键技术以及VC-6适合应用的领域.     

Wi-Fi联盟Wi-Fi 6下的6GHz技术与认证解析

Wi-Fi 6下的6 GHz技术(Wi-Fi 6E)是Wi-Fi联盟在2020年提出的,Wi-Fi 6E实际是Wi-Fi 6下的功能扩展,是Wi-Fi联盟对6GHz的Wi-Fi 6设备的一个新的认证.本文对Wi-Fi 6E的技术进行了初步介绍,主要对Wi-Fi联盟进行认证的6E功能、实验室搭建的认证设备和认证测试前提注...     

现阶段推进IPv6的关键技术

分析了IPv4，IPv6地址现状，对IPv4NAT，IPv6的关键技术进行了描述，并从网络、终端、内容应用对现阶段IPv6部署方案进行了分析和研究。     

郑州火腿无线电宣传活动纪实

2010年9月11日在郑州绿城广场举行了无线电管理宣传活动,郑州业余无线电爱好者BG6ILV、BD6LI、BD9SM、BG6IBA、BG6JCJ、BG6IA、BG6ICQ、BG6JCQ、BG6JWC.BG6JWC、BG6JNS、BG6KFK等四十余人参加了的活动。在一个上午的活动中,无线电爱好者通过电波与本地及外地业余无线电爱好者进行了通联;宣传了无线电法律法规和开     

IPV6标准进展

对IPv6标准进行了分类，介绍了与IPv6标准化相关的国内、国外标准化组织以及在这些组织中IPv6标准化工作的进展，在此基础上，对目前IPv6标准化工作的成熟度进行了分析总结。     

高压开关配电室SF6环境监控系统分析

主要针对高压开关配电室SF6(六氟化硫)环境监控系统的分析设计进行了研究,利用电化学SF6的浓度传感器,对高压配电室中的SF6浓度进行监测,与此同时,还对其湿度、温度、氧气含量等进行了监测。一旦配电室中的氧气含量与SF6超过规定的标准时,系统就会自动地开启现场的排风扇,保证工作人员安全工作。     

点击

热工信部与广电总局联合推进互联网电视业务IPv6改造近日,工信部和广电总局下发关于推进互联网电视业务IPv6改造的通知,提出2020年三季度末前三大运营商要对互联网电视业务经过的骨干网、城域网、接入网以及互联网骨干直联点相关设备进行IPv6改造;持有互联网电视集成牌照的电视台要对互联网电视集成平台进行IPv4/IPv6双栈改造,支持基于IPv6协议的调度和点播业务并覆盖互联网电视用户总数的80%。CDN服务商和终端设备厂商也要尽快进行IPv6改造。     

IPv6路由器解析

在从IPv4网络逐步过渡到IPv6网络过程中，文章结合IPv6网络建设需求对IPv6路由器和路由协议进行了分析，探讨了城域网、企业网络、个人用户对IPv6路由器的要求。     

CERNET IPv6试验床

CERNET IPv6小组自1998年上半年开始了CERNETv6试验床的建设及IPv6技术的研究工作，目前已建成了覆盖全国8大地区的基于IPv4隧道连接的CERNETv6主干网。CERNETv6从6bone申请到了／24的试验地址，并从APNIC申请到了／35的正式使用地址。同时，在试验床上还开展了IPv4/IPv6过渡技术、路由技术、搜索引擎技术等等IPv6相关技术的研究工作。     

DHCPv6中继代理的研究与实现

DHCPv6是IPv6下的动态主机配置协议,DHCPv6客户端使用本地链路多播地址发送和接收DHCPv6消息,当客户端和服务器不在同一链路上时,DHCPv6客户端就无法动态获取IP地址.DHCPv6中继代理在客户端与服务器端之间转发初始化消息,来完成客户端与服务器之间DHCPv6消息的交互.基于RFC3315设计实现了DHCPv6中继代理,实现了DHCPv6中继代理的基本功能,完成1Pv6地址的动态申请.     

6搜-高效的专用IPv6搜索引擎

基于开源搜索引擎Nutch,通过修改、调整和创新研制了文中介绍的6搜——一个专门搜索支持IPv6协议网站的专用IPv6搜索引擎。6搜的特点和创新点有:采集IPv6网页的速度在每秒100页以上;采集了54 195个IPv6网站,存储有2 000万IPv6网页,并且网页在不断更新和增加;有中文分词功能和自主创新的搜索网站功能。通过运行,6搜为用户提供了优质IPv6搜索服务;通过对6搜采集数据的分析,得到世界IPv6网站的分布。展现了IPv6网络的发展。     

IPv6对域名系统的需求及其解决方法的研究

IPV6协议是取代IPV4的下一代网络协议，它具有许多新的特性与功能。域名系统（DNS）是Internet的基础架构，IPV6的新特性也需要DNS的支持，因此，DNS势必要升级以满足IPV6的需求，文章从IPV6的地址空间，IPV6地址自动配置和即插即用，IPV6的移动性，IPV4到IPV6的过渡等几方面对IPV6对DNS的需求及其解决方法进行了分析和研究。     

Immunohistochemical analysis of S6K1 and S6K2 expression in human breast tumors

AIM: To express recombinant S6K2 in baculovirus expression system; to purify large quantities of recombinant S6K2 for biochemical studies; to generate and characterise specific MABs against recombinant S6K2; to study the patterns S6K1 and S6K2 expression and subcellular localization in normal, benign and malignant breast tissues. METHODS: Recombinant baculovirus, expressing wild type S6K2 was generated using Bac-to-Bac system (Invitrogen); recombinant S6K was purified from infected Sf9 cells using affinity purification approach; monoclonal antibodies against recombinant S6K2 were generated; the specificity of generated MABs towards recombinant and endogenous S6K2 were examined by ELISA, Western blotting, immunoprecipitation and immuhohistochemical staining; immunohistochemical detection of S6K1 and S6K2 in human breast tissues was performed using specific monoclonal antibodies towards S6K1 and S6K2. RESULTS: Large amounts of enzymatically active S6K2 were purified using baculovirus expression system; highly purified preparations of S6K2 were used to generate and characterize anti-S6K2 MABs; elevated levels of S6K1 and S6K2 were found in breast tumors when compared to normal breast tissues; S6K2 is frequently localized in the nuclei of adenocarcinoma tissues, but rarely in fibroadenoma or "normal" breast tissues. CONCLUSION: Production of recombinant S6K2 in large amount and generation of specific monoclonal antibodies towards S6K2 has provided us with excellent tools to study the function and regulation of this important signalling molecule in normal and cancer cells. Immunnohistochemical analysis of S6K1 and S6K2 expression in normal and malignant breast clearly indicates that both kinases are overexpressed in breast tumors, when compared to "normal" tissues. The retention of S6K2 in the nuclei of malignant cells may be caused by disregulation of nucleocytoplasmic shuttling and could subsequently affect cell growth and proliferation.     

Asymmetric Isomer Effects in Benzo[c ][1,2,5]thiadiazole-Fused Nonacyclic Acceptors: Dielectric Constant and Molecular Crystallinity Control for Significant Photovoltaic Performance Enhancement

Herein, asymmetric isomer effects are systematically explored by designing and synthesizing two benzo[c][1,2,5]thiadiazole (BT)-fused nonacyclic electron acceptors. By changing from BP6T-4F to asymmetric ABP6T-4F, significantly enhanced dielectric constant and inhibited excessive molecular aggregation and unfavorable edge-on orientation could be achieved. The reduced exciton binding energy also facilitates a more efficient dissociation process in PM6:ABP6T-4F compared to PM6:BP6T-4F with the same energy offset. Moreover, the weaker crystallization behavior enables a significantly enhanced miscibility between PM6 and ABP6T-4F than that between PM6 and BP6T-4F, which leads to an optimized micromorphology with smooth surface, suitable domain size, and ordered π–π stacking. Organic solar cells (OSCs) based on PM6:ABP6T-4F achieve a 15.8% power conversion efficiency (PCE), which is remarkably higher than that of PM6:BP6T-4F-based OSCs (6.4%). Furthermore, ternary devices are also fabricated considering good compatibility between ABP6T-4F and CH1007 to deliver a PCE over 17%. This study reveals the effectiveness and great potential of asymmetric isomerization strategy in regulating molecular properties, which will provide guidance for the future design of non-fullerene acceptors.     

中国领跑IPv6的机遇与挑战

2003年,中国下一代互联网(CNGI)示范项目正式启动,我国IPv6发展进程进入实质性部署阶段.与此同时,美国国防部最大的IPv6试验网络Moon6完成第一阶段测试,并启动第二阶段测试工作.以IPv6为基础的下一代互联网提供了一个改变旧规则,重新划定起跑线的机会.在未来的5～10年中,中国将面临巨大的机遇和挑战.本文通过美国的IPv6危机、中国的IPv6机遇、全球IPv6产业发展情况、中国IPv6产业发展状况、IPv6商用进程所面临的挑战及2004年IPv6发展态势等不同视角,深入探讨了中国领跑IPv6的机遇和挑战.     

Performance Analysis of Hierarchical Mobile IPv6: Does it Improve Mobile IPv6 in Terms of Handover Speed?

There has been a rapid growth in the need to support mobile nodes in IPv6-based networks. IETF has completed to standardize Mobile IPv6 (MIPv6) and Hierarchical Mobile IPv6 (HMIPv6) for supporting IPv6 mobility. Even though existing literatures have asserted that HMIPv6 generally improves MIPv6 in terms of handover speed, they do not carefully consider the details of the whole handover procedures. In this paper, based on the current IETF standards of both MIPv6 and HMIPv6, we conduct a comprehensive study of all IP-level handover procedures: movement detection, duplicate address detection, and location registration. Based on this study, we provide a mathematical analysis on MIPv6 and HMIPv6 performance in terms of handover speed. From the analysis, we reveal that the average HMIPv6 handover latency is not always lower than the average MIPv6 handover latency. Furthermore, even the intra-domain handover latency of HMIPv6 is not reduced much compared with MIPv6 handover latency. A finding of our analysis is that optimization techniques for movement detection and duplicate address detection are essential to shortening HMIPv6 handover latency and increasing the benefit of HMIPv6.

嵌入式Linux环境下DHCPv6服务的实现

随着网络技术的飞速发展,嵌入式设备对于下一代互联网协议IPv6的支持成为必然要求,而实现IPv6地址自动配置的DHCPv6服务也就成为一个关键性问题。本文介绍了IPv6和DHCPv6的相关技术特点,并以HH6410开发板为客户端．以PC机为服务端在一个IPV6网络内实现了客户端嵌入式设备的DHCPv6服务。     

IPv6标准简介

IPv6标准化的必要性。IPv6协议特点主要包括易于配置，易于扩展和安全可靠等。国外IPv6协议标准化基本完成，国际范围内有两个网络：6bone和6REN。我国IPv6标准化正在进行中，目前工作主要是国际标准本地化。