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標簽： GUIDELINES LAYOUT 320 PCB
上傳時間： 2013-10-10
上傳用戶：manga135
維吉尼亞（Vigenere）密碼為了提高密碼的破譯的難度，人們有發(fā)明一種多表置換的密碼，即一個明文字母可以表示為多個密文字母，多表密碼加密算法結(jié)果將使得對單表置換用的簡單頻率分析方法失效，其中維吉尼亞密碼就是一種典型的加密方法。維吉尼亞密碼是使用一個詞組（語句）作為密鑰，詞組中每一個字母都作為移位替換密碼密鑰確定一個替換表，維吉尼亞密碼循環(huán)的使用每一個替換表完成明文字母到密文字母的變換，最后所得到的密文字母序列即為加密得到的密文，具體過程如下： 設(shè)密鑰 ，明文 ， 加密變換 其中 例如，M＝data security，k＝best。可以先將M分解為長為4的序列data secu rity 每一節(jié)利用密鑰k＝best加密得密文c=Ek(M)=EELT TIUN SMLR。 當密鑰k取的詞組很長時，截獲者就很難將密文破解。（我們還在計算機上就維吉尼亞密碼設(shè)計的方法，編寫了一個小的程序，可以運用其進行加密和相應(yīng)的解密。見附錄） 由于我們知識和條件所限，本學期對以上6種古典加密方法進行了學習和研究，從中我們收獲頗多，我們了解古典密碼學的基本原理和方法，并能夠?qū)π畔⑦M行簡單的加密和解密，大大提高我們的學習文化知識的興趣和熱情，如果有條件我們在今后將進一步研究密碼學。
上傳時間： 2015-03-24
上傳用戶：songnanhua
CC386 is a general-purpose 32-bit C compiler. It is not an optimizing compiler but given that the code generation is fairly good. There are two versions one is for MSDOS/DPMI and one is for Win32. The Win32 version has a full-blown IDE capable of editing, building, and debugging windows programs included with it. However at this time debugging support for MSDOS is rudimentary at best and there is no IDE for DOS. the newest version, support windows.
標簽： compiler general-purpose optimizing given
上傳時間： 2015-04-12
上傳用戶：gtzj
CBC下寫的串口編程，API函數(shù)實例 I wish this site had been around when I was trying to figure out how to make serial communications work in Windows95. I, like many programmers, was hit with the double-whammy of having to learn Windows programming and Win95 serial comm programming at the same time. I found both tasks confusing at best. It was particularly frustrating because I had, over the years, written so much stuff (including lots of serial comm software) for the DOS environment and numerous embedded applications. Interrupt driven serial comm, DMA transfer serial comm, TSR serial comm, C, assembler, various processors... you name it, it had written it. Yet, everything I knew seemed upside-down in the message-driven-callback world of Windows.
上傳時間： 2014-06-20
上傳用戶：cccole0605
裝箱問題：在裝箱問題中，有若干個容量為c 的箱子和n 個待裝載入箱子中的物品。物品i 需占 用s[i]個單元（0< s[i]≤c）。成功裝載是指能把所有物品都裝入箱子。最優(yōu)裝載是指使用最 少箱子的成功裝載。 例如某運輸公司要把包裹裝入卡車中，每個包裹都有一定的重量，且每輛卡車也有其載 重限制（假設(shè)每輛卡車的載重都一樣）。在卡車裝載問題中，希望用最少的卡車來裝載包裹。 此問題可看作裝箱問題。卡車對應(yīng)于箱子，包裹對應(yīng)于物品。 解裝箱問題的Best Fit 算法： 設(shè)avail[i]為箱子i 的可用容量。 初始時，所有箱子的可用容量為c 。 選擇物品i放入具有最小avail且容量大于s[i]的箱子中。
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上傳時間： 2015-05-22
上傳用戶：yan2267246
good morning,my dear teachers,my dear professors.i am very glad to be here for your interview.my name is song yonghao,i am 22 years old .i come from luoyang,a very beautiful aicent city.my undergratuade period will be accomplished in changan university in july ,2004 and now,i am trying my best for o
標簽： dear professors interview my
上傳時間： 2015-05-24
上傳用戶：shus521
代碼名稱： Snitz Forums 2000 代碼語言： 英文 代碼類型： 國外代碼 運行環(huán)境： ASP 授權(quán)方式： 免費代碼 代碼大小： 530kb 代碼等級： 3 整理時間： 2006-3-15 16:42:00 聯(lián) 系 人： 開 發(fā) 商： 演示地址： 簡 介： Snitz Forums 2000, one of the best ASP based bulletin board systems on the market. Getting better every day! A complete board system (forum) that allows the user access to a friendly and intuitive interface. Snitz Forums 2000 v3.4.05 [74]
上傳時間： 2015-06-03
上傳用戶：caixiaoxu26
清華JAVA教程。不用多說了吧，good、better、best
上傳時間： 2015-06-25
上傳用戶：皇族傳媒
使用pso求最小化一函數(shù) matlab程式碼，寫的非常簡潔(不到100行)，且還包括了2維的圖形展示，和大家分享參考!!! 一起學習matlab和各種optimize methods 最小化：(x-15)^2+(y-20)^2 The swarm matrix is swarm(index, [location, velocity, best position, best value], [x, y components or the value component]) Author: Wesam ELSHAMY (wesamelshamy@yahoo.com) MSc Student, Electrical Enginering Dept., Faculty of Engineering Cairo University, Egypt
上傳時間： 2013-12-18
上傳用戶：zhaiye
This book focuses on combining C++ s power and flexibility with high performance and scalability, resulting in the best of both worlds. Specific topics include temporary objects, memory management, templates, inheritance, virtual functions, inlining, referencecounting, STL, and much more
標簽： flexibility performance scalability and
上傳時間： 2015-07-02
上傳用戶：784533221
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