physical network topology 中文意思是什麼
physical network topology
解釋
實體網路拓撲學-
The central hub has malfunctioned in the network. as a result, the entire network is down. which type of physical network topology is implemented
主要的集線器已經在網路里失靈。因此，這實體網路無法運作。在此是使用那種實體網路拓? -
The thesis is organized as below : in chapter 1, the background knowledge is given which is needed for study on bluetooth security mechanism and implementation. first bluetooth technology is overviewed including its develop history, radio interface, physical links, interference, network topology, core protocol, etc. next communication security is introduced according to the model of network security architecture from osi. finally some primary cryptographic techniques are discussed based on symmetric encryption, asymmetric encryption and advanced encryption standard published years ago
本文研究了利用藍牙技術提供各種安全服務和實現的課題，並通過一些具體實現的實例進行闡述，具體安排如下：在第一部分，本文首先回顧了藍牙技術及發展情況，主要包括藍牙發展簡史、藍牙標準的射頻介面、物理鏈路、干擾情況、網路拓撲結構以及核心協議等；然後介紹了通信安全的基礎知識，討論了osi系統中的四層網路安全結構模型；最後給出了各種加密技術的基本理論，包括對稱加密體制如des和blowfish 、非對稱加密體制（ rsa公鑰演算法、數字簽名和身份證明等）以及新一代的高級加密標準（ advancedencryptionstandard ， aes ）等。 -
In recent years, it has been attracted considerable attention for a mass of researchers on networks in world, and become the hot research area of computer networks, in particular, has been widely used in network fault - location, performance measurement and count expense etc. based on careful analysis on related theory, technique and application of the topology discovery in world, the author first proposes a new physical topology discovery algorithm ( ptda ) for single subnet, next introduces the new algorithm into multi - subnet case, as a result, puts forward a new ptda for multiple subnets
拓撲發現廣泛應用於網路故障定位、性能測試和計費管理等方面。本文在深入分析國內外拓撲發現相關理論、技術和應用的基礎上，提出了單子網物理拓撲發現演算法，將單子網物理拓撲發現演算法擴展到多子網中，並提出多子網物理拓撲發現演算法。在研究單子網和多子網物理拓撲發現演算法的基礎上，提出了基於生成樹協議的物理拓撲發現演算法。 -
This paper describes solving the static rwa problem, an aspect of te problem in optical network, with simulated annealing algorithm. the static rwa problem is to allocate proper route and wavelength for a set of static requests on a wdm network with and without oxcs which physical topology is known
本文研究了用模擬退火演算法解決光網路業務量工程中靜態rwa問題，在已有網路上，根據多個業務需求，合理分配網路資源，完成端到端通路的建立，達到一定的優化目標。 -
A physical topology that contains switching or bridging loops is necessary for reliability, yet a switched network cannot have loops
實體拓樸內應含有交換器或橋接器的?圈，然而交換網路卻不能含有?圈。這會造成一個左右為難的狀況。 -
It is an extreme challenge research subject for such network due to the dynamical topology change, bandwidth limitation and power constraint. the state - of - the - art of the manet technology in 5 layer : physical layer, mac layer protocols, routing protocols, transport protocol and application and middle ware issuses are summarized in this thesis. five typical routing protocols dsdv, dsr, tora, aodv and zrp are studied
本文介紹了移動自組網的起源、特徵和當前的發展狀況，並歸納了其主要的應用領域；分別從物理層、 mac層、路由層、傳輸層、中間件和應用層等5個層次分析和介紹了當前manet採用的技術和協議，尤其對路由協議（ dsdv 、 dsr 、 tora 、 aodv和zrp ）進行了詳細的研究。 -
The beginning point of the first research direction is that we design a type of load - balancing virtual topology which is insensitive to the traffic, such plan method has been proposed whose name is vlbs ( valiant load - balancing schemem ), the disadvantage of vlbs is that it can only be applied to the homogeneous network in which each node has the same capacity, in chapter2, a more general valiant load - balancing scheme ( gvlbs ) has been proposed, the advantage of the gvlbs is that it can be used both on the homogeneous network and heterogeous network, in this chapter, we will give the detail derivation process and numerical analysis. the beginning point of the second research direction is that we first design a virtual topology for the physical topology under a specific traffic matrix, for a while, the traffic has changed, the network performence will decline. under such condition, in chpater 3, a virtual topology reconfiguration algorithm is studied which can decrease the average weighted hops
本文針對動態變化業務量情況下的wdm網路設計方法劃分為兩個主要的研究方向，第一個方向的研究出發點是可以在最初的虛拓撲設計過程中根據物理拓撲情況設計出一種虛拓撲出來，該虛拓撲是負載均衡的，在這種虛拓撲上跑的業務量矩陣特徵只要在某種范圍以內，無論它怎樣動態變化，網路都不會出現擁塞，但這種虛拓撲設計演算法vlbs的一個缺陷是它只能適用於同構網路，即每個節點所擁有的容量大小都相等，在第二章中，本文提出了一種更通用的負載均衡的光網路虛拓撲設計演算法gvlbs ，該演算法與傳統的負載均衡演算法vlbs不同之處在於vlbs演算法只能適用於同構網路而gvlbs演算法既可以適用於同構網路，又可以適用於異構網路，在本章中將給出了gvlbs演算法的的詳細推導和數值分析。 -
This algorithm can solve nicely the problem of physical topology discovery for different network equipments
該演算法很好地解決網路中不同類型設備的物理拓撲發現問題。 -
Traffic engineering maps traffic into network ' s physical topology according to user ' s command, for optimizing network resource ' s allocating, avoiding network congestion and increasing network robustness
業務量工程技術就是按用戶的要求把業務量映射到網路的物理拓撲上，從而達到優化網路資源利用率、避免擁塞和提高網路可靠性的目的。 -
In optical network based on wdm, traffic engineering ( te ) is mapping traffic flows on the physical topology of optical network according to user ’ s requirement, in order to optimize the network utility, avoid jamming and improve the network reliability
在wdm光網路中，業務量工程技術（ trafficengineering ， te ）是按用戶的要求把業務量映射到光網路的物理拓撲上，從而達到優化網路資源利用率、避免擁塞和提高網路可靠性的目的。 -
On the basis of some conceptions relating to network and a brief survey of existing self - healing techniques, a norm named " the distributed character of traffic routes " is presented, which is used to judge that the survivability of a physical topology is good or not
在介紹了相關概念和回顧現有技術的基礎上，從實際網路中的業務需求分佈的角度，提出了一個可以用來衡量一個網路物理拓撲的生存性性能的指標? ?網路業務路由分佈特性。 -
In order to solve this problem, this paper proposes one kind of new topology - aware p2p network routing protocol and constructs its model tabip. it according to territorial continuity of ip address ( public network ip address ), and its node id and object id includes the information of ip address that is organized by country id. it is consistent between the node ’ s proximity of overlay network and physical node ’ s proximity
為了解決這一問題，本文提出一種新的拓撲相關p2p網路路由協議並構建其模型tabip ，它依據公網ip地址分配的區域連續性規律，在生成節點和對象標識符時加入按國家編號組織的ip地址信息，使得覆蓋網上節點的鄰近和實際節點的鄰近趨於一致。 -
A switch has failed in the network. as a result, only one segment of the network is down. which type of physical network topology is implemented
一個交換器已經在網路上失靈。因此只有一個區段網路中斷。在此是使用那種實體網路拓? -
In july 1998, the ieee standardization group selected the ofdm modulation technique for their new ieee802. 1l a standard, targeting data transmission from 11 up to 54 mbps. meanwhile, this new ieee standard is the first one to use ofdm in packet based communications. ( before the proposal of this standard, use of ofdm was limited to continuous systems ) in this paper, the author firstly presents the technical characteristics and the typical application of wireless local area network ( wlan ), analyzes its topology structure, the network configuration and etc. then the author illustrates the media access control and the operation and frame structure of physical layer
1998年7月， ofdm技術正式被ieee標準組確定為ieee802 . 11a物理層調制方法，使得無線局域網數據傳輸速率由11mbps提高到54mbps ，性能得到明顯改善。同時該標準是第一個將ofdm技術應用於包傳輸通信中的ieee標準（在該標準提出以前， ofdm的使用通常局限於連續傳輸系統中） 。本文中，作者首先介紹了無線局域網的技術特點和典型應用，分析了其拓撲結構、網路配置功能等。 -
However, they cannot reflect the topology of the physical network, which results in overlay network and the physical network seriously comes apart. the routing efficiency is difficult to guarantee. it causes the negative influence such as low search efficiency, overweight network load and so on
但是，它們不能反映物理網路的拓撲結構，使得覆蓋網和物理網嚴重脫節，路由效率得不到保證，導致實際查找效率低、網路負載過重等負面影響。 -
For a given network physical topology and long - term traffic pattern, design of delay - based logical topology can be formulated as a linear problem, a np - hard problem, which is computationally intractable for large size of networks. so, we pr opose a heuristic algorithm to address the problems of routing and wavelength assignment
基於業務平均跳數來衡量的模擬結果表明，在網路中不同qos要求的業務需求大致相當的情況下，不管網路負載如何變化，對某qos要求的vpn業務，總是能夠取得qos較之要低的業務更低的平均跳數，即更小的平均時延。
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