Each exploration in this book is a mixture of text and interactive exercises. The exercises are
unlike anything you鈥檝e seen in other books. Instead of multiple choice, fill-in-the-blank, or
simple Q&A exercises, lessons are interactive explorations of key C++ features.
Playfair Cipher
1.not even the large number of keys in a monoalphabetic cipher provides security
2.one approach to improving security was to encrypt multiple letters
3.the Playfair Cipher is an example
4.invented by Charles Wheatstone in 1854,but named after his friend Baron Playfair
Playfair Key Matrix
1.a 5X5 matrix of letters based on a keyword
2.fill in letters of keyword (sans duplicates)
3.fill rest of matrix with other letters
Encrypting and Decrypting
-plaintext is encrypted two letters at a time
1. if a pair is a repeated letter, insert filler like X’
2. if both letters fall in the same row, replace each with letter to right (wrapping back to start from end)
3. if both letters fall in the same column, replace each with the letter below it (again wrapping to top from
bottom)
4. otherwise each letter is replaced by the letter in the same row and in the column of the other letter of the pair
Some time during my development works I had the need of printing the contents of a ListView control. So I wrote down the code for a custom control, named PrintableListView, that solved the following two problems:
* extend the print on multiple pages when the width of the list exceeds the width of the print page,
* shrink, optionally, the list in a way that the resulting width fits o
problem of blind demodulation of multiuser
information symbols in a high-rate code-division multiple-access
(CDMA) network in the presence of both multiple-access interference
(MAI) and intersymbol interference (ISI) is considered.
hese are the zip files that are associated with application note
ADSP-BF533 Blackfin Booting Process (EE-240)
example.zip:
Used throughout the EE-note to explain in detail the various booting modes.
BF533 Ez Kit multiple DXE Boot.zip:
Multi-DXE Boot Example used with the ADSP-BF533 Ez-Kit Lite.
Host Boot.zip:
Example Host code to demonstrate SPI Slave Mode Booting
Program_Atmel.zip:
Example code that programs the Atmel DataFlashes via an ADSP-BF532 Processor
All programs have been written for VisualDSP++ 3.5
In 揚erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multiple carriers, rather than a single carrier. The receiver provides a correlator for each carrier, and the outputs of the correlators are combined with a maximal-ratio combiner. This type of signaling has the desirable properties of exhibiting a narrowband interference suppression effect, along with robustness to fading, without requiring the use of either an explicit RAKE structure or an interference suppression filter.
nslookup - *nix simple nslookup clone for the Win32 platform (Console Application)
/// Does A DNS lookup by Host Name or IP. Host Name lookups can return
/// multiple IP Ranges.
詳細說明：用C#編寫的的中國聯通Sgip協議，封裝了所有協議包，支持多線程，已經投入使用。-C# prepared by the China Unicom Sgip agreement, Packaging, all protocols, support multiple threads, are already in use.
Abstract—The contourlet transform is a new two-dimensional
extension of the wavelet transform using multiscale and direc-
tional fi lter banks. The contourlet expansion is composed of
basis images oriented at various directions in multiple scales,
with fl exible aspect ratios. Given this rich set of basis images,
the contourlet transform effectively captures smooth contours
that are the dominant feature in natural images.
