選呼系統 的英文怎麼說
中文拼音 [xuǎnhūxìtǒng]
選呼系統
英文
selcal system-
First of all, the development of the digital trunked communication system is summarized, and the technical characteristics of several prevail worldly digital trunked communication systems are compared. in view of the domestic situation, the tetra digital trunked radio communication system is chosen as the studying and developing model. with the study of control technology of softswitch, the protocol of the v + d air interface and the multiple use of channel is analyzed, the base station control unit of the digital trunked communication system is discussed, the calling control flow is designed
本文首先綜述了數字集群移動通信系統的發展狀況，針對目前國際上流行的數字集群體制的技術特點進行了比較和分析，並根據我國的具體國情選擇了tetra數字集群系統作為研究和開發的重點，結合對軟交換控制技術的研究和分析，對集群系統重要的v + d空中介面協議及其通道復用進行了較為深入的剖析，對數字集群實驗系統的基站控制部分進行了論述，對呼叫控制流程進行了設計。Secondly, some encryption algorithms are introduced, with the analysis and comparison for these encryption algorithms, the author designs an appropriate project to accomplish the end - to - end encryption. thirdly, this paper accomplish the design of an encryption scheme which combining the strongpoint of the rsa algorithm and the idea algorithm. the main process is as following : first, input the digital signal to the encryption device, and then the digital signal exclusive or with the keying sequence which is generated by key stream generator ( ksg ) and the ksg is based on the idea encrypting and deciphering algorithm, the secret key synchronization is also studied
本課題主要研究的內容是數字集群通信系統加密機制的研究，首先介紹了數字集群通信系統的安全保密機制，講述了單向和雙向鑒權的過程、單呼和群呼的空中介面加密過程及其密鑰的選用和管理，特別介紹了端到端加密;然後介紹了幾種常用的加密演算法，通過分析其優劣，提出了端到端加密的解決方案;最後完成了基於rsa演算法和idea演算法的數字集群通信系統加密方案的設計，其具體過程為將經過數字信號送入加密器里，和以idea加密演算法為基礎設計的密碼流發生器（ ksg ）產生的密碼序列進行加解密運算，並且研究了此加密過程的密碼同步問題。Maritime navigation and radiocommunication equipment and systems - vhf radiotelephone equipment incorporating class " d " digital selective calling - methods of testing and required test results
海上導航和無線電通信設備及系統.採用" d "級數字選擇呼叫的甚高頻無線電話設備.試驗方法和要求的試驗結果Maritime digital selectivity - calling system
水上數字選呼系統Digital selective calling system
數字選呼系統Methods of measurements of audio - frequency band and simulated systems for selective calling equipment used in the mobile services
移動通信選擇呼叫設備音頻段和模擬系統測量方法The communication scheme from the automation terminal equipment to substations has been carefully selected. so it is a favorate plan with high performance - cost ratio. the implementation of the scheme will greatly enhance the automation level in huhehaote urban distribution system
本文所提出的配電通信系統設計方案充分考慮了利用現有調度自動化通信系統，合理選擇自動化終端設備到子站的通信方式，是一個性價比較高的混合通信設計方案，該方案實施后，將大大提高呼和浩特城區配網自動化水平。In the simulation built up by opnet, the results show that short service time cell selection is better than the traditional method only based on sir and la - css / la - ho proposed by a. sang on the whole, making good use of spare resources and reducing the packet delay. another result shows that with condition b, ongoing call blocking probability is reduced at the cost of higher new call blocking probability, but the total blocking probability is reduced while the qos does n ' t degrade
經過opnettm編寫的多小區hsdpa模擬平臺的模擬模擬，模擬結果反映最短服務時間小區選擇的總體性能優于「基於sir的服務小區選擇」和由a . sang提出的la - css / la - ho ，提高系統的利用率，減低分組時延;接納條件b降低服務中呼叫的阻塞率，是以提高新呼叫阻塞率為代價，但在保證qos的前提下降低了總的呼叫阻塞率。By synthesis analysis, sum up researcher network information resource need : ( 1 ) the degree of depends on library debase, ( 2 ) searching engine has become first channel to obtain specialty information, ( 3 ) database has turned into a tool in common use to inquire about electronic resource. ( 4 ) be short of full - text database is a problem to settle in the library, ( 6 ) quality, feedback and effective link are three important factors, which is evaluated searching system for user. ( 6 ) network reference need developing ulteriorly, ( 7 ) the need of interlibrary loan and document delivery is huge. ? personalized customization of information service exists some questions. ? ducational form of information users should diversification
通過綜合分析，總結出科研人員網路信息資源需求具體表現在：科研人員對圖書館的依賴度降低；搜索引擎成為科研人員獲取專業信息的首選渠道；數據庫成為科研人員查詢電子期刊經常使用的工具；全文數據庫缺乏是圖書館急待解決的一大難題；質量高低、反應速度和有效鏈接是用戶評價檢索系統三個重要因素；網上參考咨詢服務有待進一步拓寬；館際互借服務呼聲很高，但存在的問題不容忽視；實施個性化服務略有爭議，一些方面有待商榷；用戶培訓形式注重多樣化。The calling machine hardware platform uses mcs51 microprocessor - at89c52 as the main controller. it receives instruction from the system computer and sends the code to the audio terminals. every room terminal is connected in bus mode with the calling machine through a five - line cable
呼叫主機硬體平臺核心採用了mcs51系列的單片機，並選用了atmel公司的性價比較高的?款at89c52單片機作為主控制器，與系統主機進行通信，接收主機的控制命令，實現前臺與各個終端的語音呼叫和對講。This article aims at that, firstly elaborated the sustainable development and the supporting capacity concept connotation and relation, as well as water resources condition and water resources supporting capacity concept and characteristic, then according to huhhot all previous years statistical data, has analyzed the overall changed tendency of huhhot water resources supporting capacity using spss software, finally indicated : the population and gdp are the main factors to affect the change of huhhot water resources supporting capacity
本文就針對此，選擇呼和浩特地區作為研究區域，首先闡述了可持續發展與承載力概念的內涵及關系，以及水資源狀況和水資源承載力的概念、特徵。然後根據呼和浩特歷年的統計資料，利用spss軟體分析了呼和浩特水資源承載力變化的總體趨勢，結果表明:人口和gdp是影響呼和浩特水資源承載力變化的主要因素。Direction of the hc is one only choose in the modern middle school mathematic education the traditional mathematic education focus on training the basic knowledge and capability, not cultivating the humanity and personality. the hc value called by economic era is a highest level in the mathematic education value system
人文價值取向? ?現代中學數學教育的必然選擇傳統的數學教育狠抓雙基，培養能力，忽視了人性的養成與人格的塑造；人文價值是知識經濟時代的呼喚；人文價值是數學教育價值體系的最高層次。分享友人