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标签： GUIDELINES LAYOUT 320 PCB
上传时间： 2013-10-10
上传用户：manga135
维吉尼亚（Vigenere）密码为了提高密码的破译的难度，人们有发明一种多表置换的密码，即一个明文字母可以表示为多个密文字母，多表密码加密算法结果将使得对单表置换用的简单频率分析方法失效，其中维吉尼亚密码就是一种典型的加密方法。维吉尼亚密码是使用一个词组（语句）作为密钥，词组中每一个字母都作为移位替换密码密钥确定一个替换表，维吉尼亚密码循环的使用每一个替换表完成明文字母到密文字母的变换，最后所得到的密文字母序列即为加密得到的密文，具体过程如下： 设密钥 ，明文 ， 加密变换 其中 例如，M＝data security，k＝best。可以先将M分解为长为4的序列data secu rity 每一节利用密钥k＝best加密得密文c=Ek(M)=EELT TIUN SMLR。 当密钥k取的词组很长时，截获者就很难将密文破解。（我们还在计算机上就维吉尼亚密码设计的方法，编写了一个小的程序，可以运用其进行加密和相应的解密。见附录） 由于我们知识和条件所限，本学期对以上6种古典加密方法进行了学习和研究，从中我们收获颇多，我们了解古典密码学的基本原理和方法，并能够对信息进行简单的加密和解密，大大提高我们的学习文化知识的兴趣和热情，如果有条件我们在今后将进一步研究密码学。
上传时间： 2015-03-24
上传用户：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.
标签： compiler general-purpose optimizing given
上传时间： 2015-04-12
上传用户：gtzj
CBC下写的串口编程，API函数实例 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.
上传时间： 2014-06-20
上传用户：cccole0605
装箱问题：在装箱问题中，有若干个容量为c 的箱子和n 个待装载入箱子中的物品。物品i 需占 用s[i]个单元（0< s[i]≤c）。成功装载是指能把所有物品都装入箱子。最优装载是指使用最 少箱子的成功装载。 例如某运输公司要把包裹装入卡车中，每个包裹都有一定的重量，且每辆卡车也有其载 重限制（假设每辆卡车的载重都一样）。在卡车装载问题中，希望用最少的卡车来装载包裹。 此问题可看作装箱问题。卡车对应于箱子，包裹对应于物品。 解装箱问题的Best Fit 算法： 设avail[i]为箱子i 的可用容量。 初始时，所有箱子的可用容量为c 。 选择物品i放入具有最小avail且容量大于s[i]的箱子中。
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上传时间： 2015-05-22
上传用户：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
标签： dear professors interview my
上传时间： 2015-05-24
上传用户：shus521
代码名称： Snitz Forums 2000 代码语言： 英文 代码类型： 国外代码 运行环境： ASP 授权方式： 免费代码 代码大小： 530kb 代码等级： 3 整理时间： 2006-3-15 16:42:00 联 系 人： 开 发 商： 演示地址： 简 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]
上传时间： 2015-06-03
上传用户：caixiaoxu26
清华JAVA教程。不用多说了吧，good、better、best
上传时间： 2015-06-25
上传用户：皇族传媒
使用pso求最小化一函數 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
上传时间： 2013-12-18
上传用户：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
标签： flexibility performance scalability and
上传时间： 2015-07-02
上传用户：784533221
