隨機密碼模型 的英文怎麼說
中文拼音 [suíjīmìmǎmóxíng]
隨機密碼模型
英文
random cipher model- 隨 : Ⅰ動詞1 （跟; 跟隨） follow 2 （順從） comply with; adapt to 3 （任憑; 由著） let （sb do as he li...
- 機 : machineengine
- 密 : Ⅰ名詞1 （秘密） secret 2 [紡織] （密度） density 3 （姓氏） a surname Ⅱ形容詞1 （距離近; 空隙小）...
- 碼 : Ⅰ名詞（表示數目的符號或用具） a sign or object indicating number; code Ⅱ量詞1 （指一件事或一類的...
- 模 : 模名詞1. （模子） mould; pattern; matrix 2. （姓氏） a surname
- 隨機 : random stochasticrandom
- 模型 : 1 （仿製實物） model; pattern 2 （制砂型的工具） mould; pattern3 （模子） model set; mould patter...
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For the anticounterfeiting of printings ( such as certificate ), the existent many ways ( such as rainbow holograms ) are not available as the need for special use : anti - distortion and anti - copy. basing in the double - random - phase transform, this article puts forward a new way that two - dimensional bar code is used as anticounterfeiting label with anti - printing ? scanning and anti - damage properties. the major job are : ( 1 ). basing in the ascii codes, numerals and alphabets are encoded and subsequently transformed into two - value bar code matrix figure. later, using amplitude - based double - random - phase transform, the enciphered gray scale figure is formed. by computer simulation ( 4f system ) and printing as well as scanning ( 20 times ), we get the result that the gray scale figure with little miscoding rate ( 0. 0026 ) by “ matrix expanding way ”
本文主要開展了以下三項研究工作: （ 1 ） .用自定義編碼方案，將數字和字母（ ascii碼）轉換成二值條碼圖;對該圖形進行振幅型雙隨機相位加密變換，得到原信息的加密灰度圖;通過4f光學系統計算機模擬和列印-掃描實驗，證明本文提出的「矩陣擴展法」灰度圖具有較小的誤碼率，對於20次列印-掃描實驗，誤碼率不大於0 . 0026 。Besides, this paper studies the wireless optical code division multiple access ( w - ocdma ) technology whereas its anti - jamming, security and asynchronism. based on the w - ocdma communication technology, we analyzes ocdma mac protocol, studies the protocol theory, access mechanism in detail, and models the throughput performance, simulates and analyzes the performance
（ 3 ）鑒于無線光碼分多址（ wirelessopticalcodedivisionmultipleaccess ， w - ocdma ）技術的抗干擾、保密和隨機異步接入的優點，本文分析了基於ocdma接入的無線光局域網mac協議，闡述了協議原理和接入機制，用馬爾可夫模型對吞吐量性能進行了建模和模擬計算。
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