directional gain 中文意思是什麼

directional gain 解釋
單向增益
  • directional : adj. 1. 方向的。2. 【無線電】指向的，定向的。
  • gain : vt 1 獲得；博得，掙得；贏得，打勝（戰爭、官司）。2 吸引；爭取…（到一邊），說服。3 （尤指通過努力...
  1. Smart antenna has been widely researched in communication and signal processing, the adaptive beamforming algorithm is the key technique of smart antenna. it could adaptively steer the array directional pattern to form the main narrow beams with high gain in the direction of the users " signals while deeply nulling the interference signals. it is an effective way to realize the optimal receiving of the interesting signals

    智能天線技術是目前通信和信號處理等領域的研究熱點，自適應波束形成演算法的研究是智能天線的一個關鍵技術，它能夠自適應地控制天線陣方向圖在用戶信號方向產生高增益窄波束，在干擾信號方向產生較深的零陷，是實現用戶信號最佳接收的有效方法。
  2. Traveling wave tube ( twt ) is a kind of broad - band, high powerh, high gain microwave millimeter wave amplifiers. they are widely used in communication, electronic warfare, rader system and microwave directional power weapon, taking an irreplaceable role in modern military electronic equipments and communication

    行波管是一種高增益的寬帶/毫米波功率放大器件，廣泛應用於數據通訊、電子對抗、預警飛機、火控雷達、精密制導，在現代軍事電子裝備中顯示出不可取代的重要作用，是國家重大專項的核心電子器件。
  3. The directional routing protocol ds _ dsr put forward by the author is the improvement of the current protocol dsr, complete routine discovery and maintenance by directional neighbor nodes routing table, source routing and directional steering. the research discovers the application of the directional antenna, compare the omnidirectional antenna can increases the networks " total throughput, obviously reduces the co _ channel interference ( cci ), multiple access interference ( mai ), enlarges the nodes " signal and interference to noise ratio ( sinr ), and because of the high gain of directional antenna can realize the communication with farther distance and less jump, end to end delay can decrease deeply, simultaneously, security of networks can be improved partially, the node energy also can be saved easily by power control

    本文提出的定向路由協議ds _ dsr是基於對現有協議dsr的改進下實現的，通過定向鄰節點路由表、定向源路由和定向搜索來完成路由發現與維護。研究發現，定向天線的應用，相比全向天線可明顯提高網路的總的吞吐量，減少通道干擾、多址干擾，提高信干噪比，且由於定向天線的高增益可實現較遠距離、較少跳數的通信，減少了路由發現時間，這樣大大減小了傳輸時延，網路的整體性能得到了不同程度的提高，同時部分地解決安全問題，通過功率控制還可較容易的實現節能的目的。
  4. Professor chang yi, deputy commission chief of three - dimensional directional neurosurgey specialty group of china medicine association and vice general board of china epilepsy and neurosurgery association, acts as the director. the hospital also invites professor liu chenji, a famous expert, professor hou jinhao, chen huahui, tanqifu and cai zongyao together to compose the expert consultancy commission. these technically proficient experts work closely and devote themselves to the scientific research and medical treatment, and gain approvals and high praise from the patients

    中華醫學會立體定向與神經外科專業學組委員會副委員長中國癲癇神經外科協會副理事長常義教授擔當伽瑪刀中心顧問，並聘有國內著名專家劉承基教授侯金鎬教授陳華輝教授譚啟富教授蔡宗堯教授等人，組成了專家顧問委員會，一批醫術精湛的專家通力合作，共同致力於伽瑪刀的科研和醫療，受到了廣大患者的高度肯定和贊揚。
  5. Previous research on the ad hoc network almost aim at omnidirectional antenna of all receivers and transmitters, or as a default attribution. in my thesis, firstly i describe the advantages of the directional antenna at many aspects which including spatial division multiple access ( sdma ), the antenna gain, anti - interference etc. and analyze the possibility about the directional antenna used for the ad hoc networks, secondly i study its multiple access and routine protocols using the directional antenna. and compare the protocol difference and network " performance between omnidirectional and directional antenna in particular environment

    首先闡述了定向天線在網路空分復用（ sdma ） 、天線增益、抗干擾等方面的的優勢，分析了定向天線用於移動自組網的可行性，接著重點研究了基於定向天線的多址接入協議和路由協議，分析了與全向天線在組網和協議實現中的異同點和優缺點，並對特定的環境下的網路性能作了對比。
  6. Based on the theoretical analysis of splitting mechanics and by the dynamic photoelasticity experiment, we studied the judgment how rock and concrete split under the affection of notched blasting. we built up the splitting mechanics model of rock and concretes under the affection of notched blasting. beyond all above, we gain the mechanism of notched directional splitting controlled blasting

    本文在斷裂力學理論分析基礎上，通過動光彈爆破實驗，探討了在切槽爆破作用下巖石和混凝土的斷裂判據，建立了在切槽爆破作用下巖石和混凝土的斷裂力學模型，並由此得出切槽定向斷裂控制爆破機理。
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