查询词典 discovery

We present a SNMP-based topology discovery algorithm using direct connection theorem and simple connection theorem for judging relationship of switches in subnets. In order to in discover the map of network without SNMP, several key problems such as subnet guessing and multi-address routers are discussed in details. And then a topology discovery algorithm based on primitive protocols is presented. We also deeply study some routing protocols such as OSPF and BGP and propose a routing-protocols-based algorithm for topology discovery.

基于判断交换机互联的直接连接定理和间接连接定理，提出了一种完整的基于SNMP的拓扑发现算法；详细讨论了子网获取、多址路由器处理等关键问题，针对不同的网络环境给出了相应的解决方案，并以此为基础提出了一种基于通用协议的拓扑发现算法；在对OSPF，BGP等网络路由协议进行分析的基础上给出了一种基于路由协议的拓扑发现算法，并设计了一个自上而下的拓扑发现框架结构。

Primarily, the thesis assays the condition of network framework, the network was divided into three levels in terms of network management in order to establish the distributed method ,and still pointing out the intention and denotation of studying the Topology Discovery.Next, the thesis analyzes SNMP protocol minutely, including its development, principle, and the Network Management system that established on the SNMP protocol. Have analysed MIB in detail and the application way of MIB in network management .The thesis also assays the ICMP protocol, describing its working principle and the format of datagram minutely , and describing two important tools of ICMP- Ping and TraceRoute in detail. On the base of upper analysis, the thesis expounds a kind of distributed Topology Discovery project, and book it in one autonomy system. Topology Discovery was divided into two levels in terms of network management, and analyses the way of linking up between the two level. The thesis minutely assays Router-Level Topology Discovery technology basing on SNMP and Subnet-Level Topology Discovery technology basing on ARP and ICMP. According to these analyses, the thesis explores the specific methodology and the technology of XML data object which using the WinSNMP API to achieve topology discovering system on the development platform of Visual C++, and also analyses the technology of topology analysis and topology graph minutely. Moreover, the thesis assays the technology of basic firewall and Topology Discovery response strategy. Finally, the thesis analyses the underlying blind problem of the topology finding, and also analyses the reason that the blind problem produced and the way that reduced. The distributed algorithm that this paper puts forward has a certain directive significance in wireless network or other fields.

本文首先分析了网络结构状况，将网络从网络管理的角度划分为三个层次，为分布式的方法奠定了基础，同时还指出拓扑发现研究的目的及意义；接着本文分析了SNMP协议，详细分析了SNMP协议的发展状况，协议的工作原理，以及由SNMP协议基础上建立的SNMP网络管理体系，详细分析了MIB，以及MIB在网络管理上的应用方式；本文又分析了ICMP协议，详细描述了ICMP的工作原理和数据报格式，并详细描述了ICMP的两个重要工具-Ping 和TraceRoute；然后本文在结合上述分析的基础上，提出了一种分布式的拓扑发现方案，将拓扑发现拟订在一个自治系统内，将拓扑发现从网络管理角度划分为路由器级和子网级两个层次，分析了两个层次之间的衔接方式，同时从拓扑地域的角度将拓扑发现过程分布化，分析了分布式算法的具体方法和分布式结点之间的数据通讯方法，本文详细分析了基于SNMP的路由器级拓扑发现技术和基于ARP和ICMP的子网级拓扑发现技术；根据这些分析，本文利用XML数据对象作为分布式算法中的数据对象，分析了XML的技术，本文使用Visual C++开发平台实现网络拓扑发现系统，详细分析了使用WinSNMP API实现基于SNMP的路由器级拓扑发现和基于ARP的子网级拓扑发现，分析了使用Winsock编程实现基于ICMP的子网级拓扑发现，本文还对拓扑分析和拓扑图的绘制技术作了较细致的分析；本文最后还分析了基本防火墙技术，分析了几种类型的防火墙对拓扑发现带来的影响，以及在拓扑发现时的应对策略，本文还分析了拓扑发现中可能产生的盲点问题，分析了盲点产生的原因以及拓扑发现中减少盲点的方法。

Nevertheless, one might indicate a series of major steps as follows: the discovery of the early forms of the Oedipus complex and those of the ego and the superego, and the importance of the splitting, projective, and introjective mechanisms for building up the child's internal world; the discovery of the crucial place in development of the depressive position, linked with the infant's awareness of his mother as a whole and separate person; the discovery of the anxieties and mechanisms operating before the depressive position in the paranoid-schizoid position, the point of fixation of the schizophrenic group of illnesses; and finally the discovery of early oral envy and its influence on the early stages of development.

但我们还是可以勾勒出这个发展过程中的一系列主要步骤：发现俄狄浦斯情结的早期形式以及这一阶段的自我和超我；发现分裂、投射和内投射机制对建立儿童内部世界的重要性；发现抑郁状态发展的至关重要的地位，将其与婴儿对母亲作为一个整体的人和作为一个分裂的人的觉察联系起来；发现焦虑和抑郁状态之前在偏执——分裂样状态（paranoid-schizoid position）中的运作机制，发现精神分裂症这一组疾病的固着点；最后发现早期口腔嫉妒及其对早期心理发育过程的影响。

In order to solve the topology discovery problems in autonomous territory of IPv6 network, the already existing topology discovery algorithms of IPv6 have been analyzed after introducing the interrelated technologies in the paper. Then our own topology discovery algorithm is proposed combining the characteristic of military application. Employing the lamination thought, topology discovery in autonomous territory of IPv6 is divided into two parts--dendriform topology discovery and retiform topology discovery.

为了解决在IPv6网络下自治域内的拓扑发现问题，本文在介绍了IPv6相关技术后对现有的IPv6网络环境下的拓扑发现算法进行了分析，然后结合军事应用的特点提出了自己的拓扑发现方法，该方法利用分层的思想，把IPv6自治域内拓扑发现分为树状拓扑发现和网状拓扑发现两部分。

The core thought of retiform topology discovery algorithm is penetration strategy based secondary source routing topology discovery algorithm, which has greatly improved the discovery probability of boundary router, furthermore, has improved the fraction of coverage of the whole topology discovery.

其中网状拓扑结构发现算法核心思想是基于穿透策略的二次源路由拓扑发现算法，其优点在于大大提高了边界路由器的发现概率，进而增大了整个拓扑发现的覆盖率。

The inscription on animal bones and tortoise shells discovery was rules the time in more than 100 year ago Guang Xu, country firm Wang Yirong the big sickness, sought medical help in all directions looks for the medicine, discovered accidentally in raw material for medicine had one kind to engrave the writing carapace, thought was the very valuable antiques, therefore then sent human here to seek to buy, after the original these carapaces were area the Henan Anyang the farmer ascend to attain sold to the pharmacy, afterwards passed through on the research discovery carapace the trace to be supposed to be the ancient writing, this discovery has caused a stir the academic circles and the cultural circle, from this time on, the inscription on animal bones and tortoise shells received many scholars, the antique dealer and collector's values.

甲骨文的发现是在一百多年前的光绪统治时期，国子坚王懿荣得了大病，四处求医找药，无意中发现药材中有一种刻了文字的龟甲，认为是很有价值的古物，于是便派人此处搜购，原来这些龟甲是河南安阳一带农民拾获后卖给中药店的，后来经研究发现龟甲上的纹路应该就是古老的文字，这个发现轰动了学术界和文化界，从此，甲骨文受到许多学者、古董商和收藏家的重视。

According to the writer, Li balances literary critics w...ith other artistic categories, and appreciates critical works from the height of aesthetics. From Li's brand-new perspective, critique is not only"independent"but also"artistic", which is of remarkable significance as regards its implication in the revolutionary changes of literary criticism. The 2nd chapter"literary criticism is a form of discovery", literarily refers to Li Jianwu stressed that critic main body consciousness to text permeating, and his claims on critics'subjectivity and capabilities in aesthetic judgments. The writer concludes Li's ideas as the three following aspects:"critique is self-discovery","critique is the discovery of the writer's mind", and"critique is the discovery of humanity in literature", and gives full illustration one by one.

他把文学批评放在了与其他艺术品类平等的位置，并且从审美的高度衡量文学批评，认为批评是&独立的批评&，也是&艺术的批评&，其意义非常深远，具有文学批评革命性的改变这一意味在里面；第二章&文学批评是一种发现&指的是李健吾强调批评家主体意识对文本的渗入，要求发挥批评家的主体作用和审美判断能力，笔者将此概括为：&批评是自我的发现&、&批评是作家心灵的发现&、&批评是作品中人性的发现&三个方面，并一一进行阐释；第三章重点论述李健吾文学批评的模式。

But at one Sea World park called Discovery Cove, two dolphins collided mid-air, killing one of them.

但是一个叫做 Discovery Cove 的海底世界公园里进行的表演中，两只海豚在空中相撞，其中一只死亡。

The car was then restored by the Bandt family. It is currently loaned to Ford Australia and being displayed in Ford Discovery Centre in Geelong.

当时斑特家庭决定重建该车，而那辆车现在借给位於 Geelong 志朗的 Ford Discovery Centre 福特汽车发现中心。

The main content includes as the follows:(1) An automatic neighbor discovery mechanism applicable to SDH network is proposed;(2) For the optical network with Optical Transfer Unit in WDM, a General Multi-protocol Label Switch-based automatic neighbor discovery mechanism is proposed and simulated;(3) Three automatic neighbor discovery mechanisms for the all-optical network with OEO module are proposed and comparatively simulated;(4) With the Loss of Light detecting, a novel automatic neighbor discovery mechanism in all-optical network without any OEO module is proposed.

主要工作包括：（1）提出了SDH网络的自动邻居发现机制；（2）提出了带波长转换器的光网络的自动邻居发现方案，并通过仿真对发现过程进行了跟踪和统计；（3）提出了三种带有光电转发模块的光网络的自动邻居发现策略，并做了仿真比较；（4）提出通过光丢失检测方式对不带OTU的光网络进行自动邻居发现的实现方法。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。