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Description: 实现最优二叉树的构造；在此基础上完成哈夫曼编码器与译码器。 假设报文中只会出现如下表所示的字符：
字符 A B C D E F G H I J K L M N
频度 186 64 13 22 32 103 21 15 47 57 1 5 32 20 57
字符 O P Q R S T U V W X Y Z ， ．
频度 63 15 1 48 51 80 23 8 18 1 16 1 6 2
要求完成的系统应具备如下的功能：
1．初始化。从终端（文件）读入字符集的数据信息，。建立哈夫曼树。
2．编码：利用已建好的哈夫曼树对明文文件进行编码，并存入目标文件（哈夫曼码文件）。
3．译码：利用已建好的哈夫曼树对目标文件（哈夫曼码文件）进行编码，并存入指定的明文文件。
4．输出哈夫曼编码文件：输出每一个字符的哈夫曼编码。
Platform: |
Size: 132535 |
Author: 张娟 |
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Description: Digital Signature Algorithm (DSA)是Schnorr和ElGamal签名算法的变种，被美国NIST作为DSS(DigitalSignature Standard)。算法中应用了下述参数：
p：L bits长的素数。L是64的倍数，范围是512到1024；
q：p - 1的160bits的素因子；
g：g = h^((p-1)/q) mod p，h满足h < p - 1, h^((p-1)/q) mod p > 1；
x：x < q，x为私钥 ；
y：y = g^x mod p ，( p, q, g, y )为公钥；
H( x )：One-Way Hash函数。DSS中选用SHA( Secure Hash Algorithm )。
p, q, g可由一组用户共享，但在实际应用中，使用公共模数可能会带来一定的威胁。签名及验证协议如下：
1. P产生随机数k，k < q；
2. P计算 r = ( g^k mod p ) mod q
s = ( k^(-1) (H(m) + xr)) mod q
签名结果是( m, r, s )。
3. 验证时计算 w = s^(-1)mod q
u1 = ( H( m ) * w ) mod q
u2 = ( r * w ) mod q
v = (( g^u1 * y^u2 ) mod p ) mod q
若v = r，则认为签名有效。
DSA是基于整数有限域离散对数难题的，其安全性与RSA相比差不多。DSA的一个重要特点是两个素数公开，这样，当使用别人的p和q时，即使不知道私钥，你也能确认它们是否是随机产生的，还是作了手脚。RSA算法却作不到。
Platform: |
Size: 136954 |
Author: wildkaede |
Hits:
Description: Digital Signature Algorithm (DSA)是Schnorr和ElGamal签名算法的变种，被美国NIST作为DSS(DigitalSignature Standard)。算法中应用了下述参数：
p：L bits长的素数。L是64的倍数，范围是512到1024；
q：p - 1的160bits的素因子；
Platform: |
Size: 1107 |
Author: 修凤志 |
Hits:
Description: 基于MATLAB的
M=64的QAM系统进行蒙特卡罗仿真-based on MATLAB M = 64 QAM systems Monte Carlo simulation
Platform: |
Size: 2048 |
Author: lifeforent |
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Description: BPSK.QPSK.16QAM.64QAM调制解调-BPSK.QPSK.16QAM.64QAM modem
Platform: |
Size: 4096 |
Author: 周郭楠 |
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Description: 实现最优二叉树的构造；在此基础上完成哈夫曼编码器与译码器。 假设报文中只会出现如下表所示的字符：
字符 A B C D E F G H I J K L M N
频度 186 64 13 22 32 103 21 15 47 57 1 5 32 20 57
字符 O P Q R S T U V W X Y Z ， ．
频度 63 15 1 48 51 80 23 8 18 1 16 1 6 2
要求完成的系统应具备如下的功能：
1．初始化。从终端（文件）读入字符集的数据信息，。建立哈夫曼树。
2．编码：利用已建好的哈夫曼树对明文文件进行编码，并存入目标文件（哈夫曼码文件）。
3．译码：利用已建好的哈夫曼树对目标文件（哈夫曼码文件）进行编码，并存入指定的明文文件。
4．输出哈夫曼编码文件：输出每一个字符的哈夫曼编码。
Platform: |
Size: 132096 |
Author: 张娟 |
Hits:
Description: Digital Signature Algorithm (DSA)是Schnorr和ElGamal签名算法的变种，被美国NIST作为DSS(DigitalSignature Standard)。算法中应用了下述参数：
p：L bits长的素数。L是64的倍数，范围是512到1024；
q：p - 1的160bits的素因子；
g：g = h^((p-1)/q) mod p，h满足h < p - 1, h^((p-1)/q) mod p > 1；
x：x < q，x为私钥 ；
y：y = g^x mod p ，( p, q, g, y )为公钥；
H( x )：One-Way Hash函数。DSS中选用SHA( Secure Hash Algorithm )。
p, q, g可由一组用户共享，但在实际应用中，使用公共模数可能会带来一定的威胁。签名及验证协议如下：
1. P产生随机数k，k < q；
2. P计算 r = ( g^k mod p ) mod q
s = ( k^(-1) (H(m) + xr)) mod q
签名结果是( m, r, s )。
3. 验证时计算 w = s^(-1)mod q
u1 = ( H( m ) * w ) mod q
u2 = ( r * w ) mod q
v = (( g^u1 * y^u2 ) mod p ) mod q
若v = r，则认为签名有效。
DSA是基于整数有限域离散对数难题的，其安全性与RSA相比差不多。DSA的一个重要特点是两个素数公开，这样，当使用别人的p和q时，即使不知道私钥，你也能确认它们是否是随机产生的，还是作了手脚。RSA算法却作不到。
Platform: |
Size: 136192 |
Author: wildkaede |
Hits:
Description: pwm调制，proteus仿真，程序，电路图，全套，有不明白的Q我：64134703-pwm modulation, proteus simulation, procedures, circuit diagrams, complete, and I do not understand Q: 64,134,703
Platform: |
Size: 34816 |
Author: 无名 |
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Description: 课程设计：
1.求出在一个n×n的棋盘上，放置n个不能互相捕捉的国际象棋“皇后”的所有布局。
2.设计一个利用哈夫曼算法的编码和译码系统，重复地显示并处理以下项目，直到选择退出为止。
【基本要求】
1) 将权值数据存放在数据文件(文件名为data.txt，位于执行程序的当前目录中)
2) 分别采用动态和静态存储结构
3) 初始化：键盘输入字符集大小n、n个字符和n个权值，建立哈夫曼树；
4) 编码：利用建好的哈夫曼树生成哈夫曼编码；
5) 输出编码；
6) 设字符集及频度如下表：
字符 空格 A B C D E F G H I J K L M
频度 186 64 13 22 32 103 21 15 47 57 1 5 32 20
字符 N O P Q R S T U V W X Y Z
频度 57 63 15 1 48 51 80 23 8 18 1 16 1
-Curriculum design:
1. Obtained in an n × n chessboard, the place to catch each other should not n个chess "Queen" of all the layout.
2. The design of a use of Huffman coding and decoding algorithms systems, and deal with duplicate to show the following items until the exit date selection.
The basic requirements 【】
1) will be the right value data stored in data files (file named data.txt, located in the implementation of procedures in the current directory)
2), respectively, dynamic and static storage structure
3) Initialization: keyboard input character set size of n, n and n characters of the right value, set up Huffman tree
4) Coding: Using the built Huffman tree generated Huffman coding
5) output coding
6) The character set and the frequency of the following table:
Space characters A B C D E F G H I J K L M
Frequency of 186 64 13 22 32 103 21 15 47 57 1 5 32 20
Character N O P Q R S T U V W X Y Z
Frequency 57 63 15 1 48 51 80 23 8 18 1 16 1
Platform: |
Size: 550912 |
Author: 赵刚 |
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Description: CDMA2000,复扩频， 输入I、Q两路各384个信息比特，经过WALSH码调制和短PN码扩频，I、Q两路各输出384*64个信息比特。-CDMA2000, complex spread-spectrum, type I, Q of the two information bits 384, after WALSH short PN code modulation and spread spectrum code, I, Q output of the two 384* 64 bits of information.
Platform: |
Size: 159744 |
Author: alice |
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Description: CDMA2000，解复扩频，输入I、Q两路各384*64个信息比特，经过短PN码解扩频和WALSH码解调，I、Q两路各输出384个信息比特-CDMA2000, spread spectrum demultiplexing, type I, Q of the two-way 384* 64 bits of information, after a short PN code and spread spectrum solutions WALSH demodulation code, I, Q output of two of the 384 information bits
Platform: |
Size: 160768 |
Author: alice |
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Description: 1，初始化：
如果AD7705复位引脚直连VCC，最好在初始化程序中加入初始化序列，不然ready信号不会输出。
2，输入范围
如果AD7705采集单端信号，则输入必须在0到VDD之间，而不可以超出或为负，如果一个输入为负，则另一个输入会有灌入电流的现象，芯片无法正常运行。-AD7705 is a complete 16-bit A ö D converter. Within
Structure in Figure 1. If the external crystal oscillator, precision voltage reference and less
Amount of decoupling capacitance, A ö D to continuous conversion. It uses a
But lower-cost access to high-resolution 2- $ conversion technology
Operation, error-free access to 16-bit data output. This is a very
Consistent with the higher resolution but less demanding digital conversion
Applications such as digital audio products and intelligent instrumentation products.
Following a few important part of the device for a brief description and characteristics.
AD7705 programmable gain amplifier includes two full-differential
Sub-channel analog input.-Chip programmable gain amplifier PGA
Eight selectable gain 1,2,4,8,16,32,64,128
One can swing the scope of different types of input signal amplification to close
A ö D converter full scale voltage converter A ö D again, this favorable
On improving the q
Platform: |
Size: 34816 |
Author: |
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Description: MAX260/261/262是MAXIM公司推出的可编程开关电容通用滤波器，通过单片机（89C51）对该芯片的6个输入端进行有效设置可实现64个不同的中心频率f0，而且Q值可达128。文中介绍了这些通用滤波器的功能、特性以及典型应用电路。 -MAXIM Unveils MAX260/261/262 is programmable general-purpose switched-capacitor filter, through the single-chip microcomputer (89C51) chips of the six inputs can be effectively set up 64 different center frequency f0, and the Q value up to 128. In this paper, the generic filter functions, characteristics and typical application circuit. :
Platform: |
Size: 1321984 |
Author: zhanxiaohong |
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Description: 用单片机AT89s52对可编程滤波器芯片MAX262 进行程序控制，可以同时对两路输入信号进行二阶低通、高通、带通、带阻以及全通滤波处理，滤波器的中心频率在15kHz～50kHz 频率范围内实现64 级程控调节，其Q 值在0.5～64 范围实现128 级程控调节。-In a simple, accurate, reliable, stable and universal principles, use of a hierarchical design to match the idea of interconnection. The characteristics of the system is: through the analog switch to change the feedback resistor value, thus changing the amplifier gain, gain from 10dB to 60dB adjustable step to 10dB.
With single-chip programmable filter AT89s52 of MAX262 chip to program, you can at the same time the input signal for two second-order low-pass, high pass, band-pass, band-stop and all-pass filter processing, filter center frequency in 15kHz ~ 50kHz frequency range of 64 to achieve adjustment program, the Q value in the range of 0.5 ~ 64 conditioning program to achieve 128.
Platform: |
Size: 47104 |
Author: chenchong |
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Description: M=512 原图像长度
N=64
K=8
I=zeros(M,M)
J=zeros(N,N)
BLOCK=zeros(K,K)
显示原图像
I=imread( f:\ceshi\yuanshitu.bmp )
figure
imshow(I)
xlabel( 原始图像 )
显示水印图像
J=imread( f:\ceshi\logistic_nuaa64.bmp )
figure
imshow(J)
xlabel( 水印图像 )
嵌入水印
tem=1
for p=1:N
for q=1:N
x=(p-1)*K+1
y=(q-1)*K+1
BLOCK=I(x:x+K-1,y:y+K-1)
BLOCK=dct2(BLOCK)
if J(p,q)==0
a=-1
else
a=1
end
BLOCK(2,1)=BLOCK(2,1)*(1+a*0.01)
BLOCK=idct2(BLOCK)
I(x:x+K-1,y:y+K-1)=BLOCK
end
end
显示嵌入水印后的图像
figure
imshow(I)
xlabel( 嵌入水印后的图像 )
imwrite(I, f:\ceshi\embedded.bmp )-M=512 原图像长度
N=64
K=8
I=zeros(M,M)
J=zeros(N,N)
BLOCK=zeros(K,K)
显示原图像
I=imread( f:\ceshi\yuanshitu.bmp )
figure
imshow(I)
xlabel( 原始图像 )
显示水印图像
J=imread( f:\ceshi\logistic_nuaa64.bmp )
figure
imshow(J)
xlabel( 水印图像 )
嵌入水印
tem=1
for p=1:N
for q=1:N
x=(p-1)*K+1
y=(q-1)*K+1
BLOCK=I(x:x+K-1,y:y+K-1)
BLOCK=dct2(BLOCK)
if J(p,q)==0
a=-1
else
a=1
end
BLOCK(2,1)=BLOCK(2,1)*(1+a*0.01)
BLOCK=idct2(BLOCK)
I(x:x+K-1,y:y+K-1)=BLOCK
end
end
显示嵌入水印后的图像
figure
imshow(I)
xlabel( 嵌入水印后的图像 )
imwrite(I, f:\ceshi\embedded.bmp )
Platform: |
Size: 1024 |
Author: 123096321 |
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Description: the OFDM PHY is adaptive therefore it supports
multiple schemes BPSK, QPSK, 16-QAM and 64-QAM for
data carriers’ modulation. The constellation diagrams are
gray mapped and shows the magnitudes I and Q (In-phase
and Quadrature) components of each incoming bit(s)
combination along with their normalization factor C to
calculate magnitude of each model
Platform: |
Size: 1497088 |
Author: san |
Hits:
Description: Cephes Mathematical Library. Latest Linux distribution, dated 6/4/00. Special functions and other goodies in C, including long double precision routines for 68K, 386, and sparc processors. This is the most complete distribution package of the function library (but not the most up-to-date one). It includes these sections-- double: all functions in 64-bit double precision single: all available functions in 32-bit single precision long double: all available functions in 80-bit extended precision 128bit: all available functions in 128-bit long double precision qlib: all functions in q-type extended (44 to 106 decimal) precision, includes a C++ class for the binary floating point arithmetic and a q-type calculator program c9x-complex: new C language standard C9X data type for complex variables, header complex.h for GNU C and functions in float complex, double complex, and long double complex precisions. -Cephes Mathematical Library. Latest Linux distribution, dated 6/4/00. Special functions and other goodies in C, including long double precision routines for 68K, 386, and sparc processors. This is the most complete distribution package of the function library (but not the most up-to-date one). It includes these sections-- double: all functions in 64-bit double precision single: all available functions in 32-bit single precision long double: all available functions in 80-bit extended precision 128bit: all available functions in 128-bit long double precision qlib: all functions in q-type extended (44 to 106 decimal) precision, includes a C++ class for the binary floating point arithmetic and a q-type calculator program c9x-complex: new C language standard C9X data type for complex variables, header complex.h for GNU C and functions in float complex, double complex, and long double complex precisions.
Platform: |
Size: 1754112 |
Author: liyi |
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Description: ARM经典的300项提问，总共64页。 -ARM classic 300 Q
Platform: |
Size: 367616 |
Author: sjh |
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Description: 挂Q源码，上传至服务器即可24小时挂Q，赶快来体验吧。-use this programmer to gq
Platform: |
Size: 20480 |
Author: 于鼎衡 |
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Description: 用于设备交接图纸，安装补丁运行完成后安装(Panasonic A5 private server software 64 bit operating system)
Platform: |
Size: 1560576 |
Author: markliu
|
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