link switching 中文意思是什麼
link switching
解釋
通道轉換-
In a wide area network, a high speed link to which nodes or data switching exchanges ( dses ) are connected
廣域網中的一種高速鏈路，和它相連的是網點或數據交換機（ dses ） 。 -
High - frequency link power converters are receiving increasing attention. when the input frequency of ac - ac converter is quite high, such as 20khz or above, in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage, the switching cycle becomes discrete pulse spectrums, however, the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria
當交-交變頻器的輸入頻率非常高，通常為20khz時，為了在零電壓條件下實現逆變器開關管的通斷，變換器的開關時刻必須選擇在高頻交流電壓脈沖為零時，這意味著變換器開關時刻在時間軸上成為不連續的點，而常規的硬開關pwm變換器是將開關時刻選擇在任意時刻。 -
To analyze some key technologies of optical network relative with rwa in detail, such as transmission, switching and internetworking ; to emphasize on the research of function, fabric and performance of optical cross - connection ; to carry out numerical simulations for crosstalk introduced by optical cross connect and to present measurements for suppressing it such as doubly filtering, fixing optimum decision threshold and appropriately choosing the number of multiplexed wavelengths ; 3. to research the fundamental principle and some problems relative with rwa, including the type of optical network, the type of traffic, the type of service, the survivability of optical network ; to classify and compare rwa algorithms and particularly research some dynamic rwa algorithms ; 4. to present reserved light - path and classify network resource such as used, unused and reserved status, to emulate establishment of all - optical connection in optical network through modified rwa algorithm and show effectively reducing setup time of all - optical connection utilizing reserved light - path ; to research rwa algorithms of multi - fiber network, to present new link weight functions dependent on node degree, unused fiber ( s ) per wavelength - layer and routing policies, to perform emulation of rwa based wavelength layer graph applying new link weight functions and show them make algorithms better performance and network lower blocking rate ; 5
詳細分析了與rwa相關的光網路關鍵技術，包括傳輸、交換、組網等，重點研究了光交叉連接的功能和結構、性能，對其引入的串擾進行了詳細分析，選擇恰當的器件參數進行了數值模擬，並提出了抑制措施（如雙重濾波、優化判決門限、選擇恰當的復用波長數） ; 3 .研究了光網路的r認叭的基本原理、與r認叭的幾個相關問題（光網路類型、業務類型、流量類型、光網路生存性） 、 r認人演算法的分類和比較，具體研究了幾種動態r場人演算法; 4 .研究了以全光連接建立時間為優化目標的r認認演算法，提出預置光路的概念，對網路資源進行狀態分類（佔用、未佔用、預置） ，利用改進的r認叭演算法模擬，預置光路可為部分新到的連接請求快速建立連接，從而提高網路性能;研究了以多光纖網路連接阻塞率為優化目標的r認城演算法，提出了以節點度數、每個波長分層的空閑光纖數以及路由策略決定的幾種鏈路權重函數，利用基於波長分層圖模型的并行r場人演算法模擬，利用新的鏈路權重函數使得演算法具有更優的性能，使網路具有更低的連接阻塞率。 -
A novel cycloconverter - rype three - phase hf link inverter topology for soft - switching based on phase - shifted full - bridge mode is proposed, whose main advantages are as follows : under the conditions of d < i < and overlap - d, the switches of the leading leg are turned on at zvs and the switches of the lagging leg are turned off at zcs and all switches of the cycloconverter circuit are commutated in the overlapping mode in the interval of zero voltage, which makes the circuit realize soft switching to the utmost extent and reliably solve the problem of peak voltage caused by the storing energy of leakage inductance of hf transformer
論文提出一種新型移相全橋軟開關周波變流型三相高頻鏈逆變器，電路的主要優點是：前級移相全橋的移相角控制在_ d _ i和_ （ overlap ） - _ d條件下，超前橋臂零電壓開通，滯后橋臂零電流關斷，並使周波變流器所有開關在零電壓期間重疊換相，使整機開關最大程度地實現了軟開關，並可靠解決了高頻變壓器漏感儲能引起的電壓尖峰問題。 -
Due to the complexity of the structure and control of cycloconverter - type three - phase hf link inverter for soft - switching based on phase - shift - controlled full - bridge mode, a simple and optimized vvvf control strategy is proposed. this control strategy includes : produced pwm by space voltage vector ( svm ) and equivalent carrier frequency fe = 1 / te are introduced into the pdm control of the cycloconverter ; softened equivalent pwm wave is generated at the notches of hf voltage pulses ; the harmonious control between regulating pulse width by phase - shifted angle and regulating voltage of equivalent pwm is to minimize the harmonics content of output voltage of the inverter
西安理工大學博士學位論文針對這種前級移相全橋軟開關周波變流型三相高頻鏈逆變器結構和控制的復雜性，提出了一種實現簡單而整體優化的vvvf控制策略:將空間電壓矢量產生p姍的方法svm和等效載波頻率fe = 1 / te引入到周波變流器的pdm控制;按高頻電壓脈沖前後沿軟化等效p翎波;用移相調節高頻脈沖寬度和等效p姍調壓協調控制逆變器輸出電壓，在滿足輸出電壓條件下使諧波最小。 -
Under the test conditions of ud = 2800v and 350hz switching frequency, the current in three phase inverting test reached to loooar. m. s, which can fully meet the requirements of 350km / h emu with 2600v link voltage and 950ar
在中間直流環節電壓u _ d = 2800v ，開關頻率為350hz的條件下，逆變的試驗電流達到了1000ar . m . s ，完全能夠滿足350km h高速動車組對變流器中間電壓2600v 、輸出電流為950ar . m . s的要求，表明了地面試驗機組的研究獲得了成功。 -
Through switching over back and forth between internal and external network, this scheme isolates interior network from exterior network in physical link layer at same time, but logic link to each other
它通過在內外網間來回切換，同一時刻內外網間沒有連接，處於物理隔離狀態，但又邏輯地相連。 -
Another trend is towards phones that double as both fixed and mobile devices, using cellular networks when outdoors and switching to fixed networks, accessed via a short - range radio link to a small basestation, when indoors
另一個趨勢是電話會兼作移動設備與固定設備，在室外使用蜂窩式網路，而進入室內時，可通過短程電波接入小型基站切換至固話網路。 -
That is why more and more people pay more attention to it. the technology applied in resonant dc link inverter ( rdcli ) is one of soft switching technologies. it makes the current or voltage in dc bus return zero periodically ; through resonant technology in the circumstance of switching change
作為軟開關技術的一種應用? ?諧振直流環節逆變器，在直流環節利用諧振技術使母線電壓或電流周期性地回零，為開關在換流時刻提供零電流或零電壓條件，從而達到降低開關損耗的目的。 -
The twelve kinds of modes and equivalent circuits of this inverter with high frequency link within one high frequency switching period are carefully analyzed ; by using the state - space averaging approach, the inverter ’ s averaging model is presented, and the design criterion of key circuit parameters and the output characteristic curve are given ; the analyses of the system stabilization and the mathematic analyzes of the principle of high - frequency - link of this inverter have also be done. prototypes for 1kva 270v 10 % dc / 115v400hzac uni - polarity phase shifting controlled bi - directional voltage mode inverter with high frequency link is designed
以全橋橋式拓撲為例，論述了雙向電壓源型高頻環節逆變器單極性移相控制的原理、逆變器在一個高頻開關周期內的十二個工作模式及其等效電路;採用狀態空間平均法建立了逆變器平均模型，獲得了這類逆變器的關鍵電路參數的設計準則和外特性曲線;分析了系統穩定性，並對逆變器高頻環節原理進行了數學分析。 -
The twelve kinds of modes and equivalent circuits of voltage mode ac - ac mode ac / ac converters with high frequency link within one high frequency switching period are carefully analyses. by using the state - space averaging approach, the converter ' s averaging model is presented, and the design criterion of key circuit parameters and the output characteristic curve are given
以全橋橋式拓撲為例，論述了單極性移相控制的原理、單極性移相控制電壓源交?交型高頻環節ac ac變換器在一個高頻開關周期內的十二個工作模式及其等效電路。採用狀態空間平均法建立了變換器平均模型，獲得了關鍵電路參數的設計準則和變換器的外特性曲線。 -
If the entry page is coded in chinese, the language switching link can be put as the first link at the top of the entry page so that foreign users can switch to the english version immediately upon entry to the site without the need to read the chinese codes that are in the rest of the page
如網站的進入頁是以中文編寫，則轉換語言的連結可放在該頁的頁頂作為第一個連結，使外地的用戶一進入該網站便可立即轉往英文版本，毋須先讀完該中文網頁的其餘部分。 -
The mpls technology was raised just in order to make the most of the switching technology in the core of the network and the ip routing technology on the edge of the network. before presenting the solution of the mpls, there are many integration model, the basic method adopted by them were all carry the control information from the ip router, and combine it with the transmition capability and the label switching of the atm switching machine, accordingly constructing a high speed and economic multi layer switching router. but, all these solutions can not communicate and just suit for adapting the atm as the second layer transmiting link, can n ' t work on other interface ( fr, ppp, and ethernet ), this is obviously conflict with the developing way of the based on packet of the internet
多協議標簽交換（ mpls ）技術就是為了綜合利用網路核心的交換技術和網路邊緣的ip路由技術各自的優點而產生的。在mpls技術方案提出之前已有的各種集成模型解決方案所採取的基本方法都是從ip路由器獲取控制信息，將其與atm交換機的轉發性能和標簽交換方式相結合，從而構建成一個高速而經濟的多層交換路由器。但是，各種方案彼此不能互通，而且僅適用於以atm作為第2層的傳輸鏈路，不能工作在其他多種媒體（如幀中繼、點對點協議、以太網）中，這與internet基於分組的發展方向相矛盾。 -
Nintendo has been strong, now is the time to eradicate the evil of operations guide : keyboard control, the next jump and move around, firing blanks, press box link xu li, shift type switching armor firepower. key
洛克人已經強大起來了，現在就是消滅邪惡的時候了操作指南：鍵盤控制，上下左右移動跳躍，空格射擊，按住空格不放蓄力， shift鍵切換護甲火力類型。 -
Introduction : nintendo has been strong, now is the time to eradicate the evil of operations guide : keyboard control, the next jump and move around, firing blanks, press box link xu li, shift type switching armor firepower
攻略：洛克人已經強大起來了，現在就是消滅邪惡的時候了操作指南：鍵盤控制，上下左右移動跳躍，空格射擊，按住空格不放蓄力， shift鍵切換護甲火力類型。 -
At present, the backbone transport network in china mainly introduced the sdh transport techniques and atm switching techniques, then the network functions and traffics are highly integrated. and the damage of transport link and / or node failures will become much more serious than that of existing networks. in addition, because of the increasing social dependence on communication systems and the growing importance of information, it is very important to study network survivability strategies, which is also one of the important criterions to evaluate transport networks
這意味著通信網，尤其是大容量的高速通信網的失效（包括節點和線路的失效）將會給人們帶來巨大的經濟損失；另外，隨著人們生活水平的提高，人們對信息傳送的質量的要求也越來越高，這使得通信網的生存策略研究顯得很迫切；況且，中國已加入wto ，電信運營的競爭日趨激烈，為了在競爭中有一席之地，各電信運營商必需提供高質量、低成本的電信服務，這進一步促使通信網的生存策略研究提上日程。 -
In the conventional pmsm dtc system, the stator flux linkage is calculated from the integration of the difference between the machine input voltage and voltage drop across the stator resistance, and the input voltage is obtained by synthesizing the dc - link voltage and the switching mode of the inverter
在常規直接轉矩控制系統中，定子磁鏈是通過直接積分電機端部輸入電壓與定子電阻壓降之差計算得到的。電機端部的輸入電壓又是通過電機直流母線電壓和逆變器的開關狀態綜合得到的。
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