Coaxial feed structures are widely used in ultra-wide band antennas . This paper modeled the characteristic of the monopole antenna feeded by coaxial line by FDTD in the time-domiain,which showes that . Firstly, it introduced the theory of the arithmetic and the particularly realization in the calculation then it described the use in the time-domain finally it analysed several characteristics of the monopole antenna. The arithmetic used in the microstrip antenna is also a quick and economical way to design the antenna.
標(biāo)簽： structures ultra-wide antennas Coaxial
上傳時(shí)間： 2016-06-28
上傳用戶：朗朗乾坤
Digital Signature Algorithm (DSA)是Schnorr和ElGamal簽名算法的變種，被美國(guó)NIST作為DSS(DigitalSignature Standard)。算法中應(yīng)用了下述參數(shù)： p：L bits長(zhǎng)的素?cái)?shù)。L是64的倍數(shù)，范圍是512到1024； q：p - 1的160bits的素因子； g：g = h^((p-1)/q) mod p，h滿足h < p - 1, h^((p-1)/q) mod p > 1； x：x < q，x為私鑰 ； y：y = g^x mod p ，( p, q, g, y )為公鑰； H( x )：One-way Hash函數(shù)。DSS中選用SHA( Secure Hash Algorithm )。 p, q, g可由一組用戶共享，但在實(shí)際應(yīng)用中，使用公共模數(shù)可能會(huì)帶來一定的威脅。簽名及驗(yàn)證協(xié)議如下： 1. P產(chǎn)生隨機(jī)數(shù)k，k < q； 2. P計(jì)算 r = ( g^k mod p ) mod q s = ( k^(-1) (H(m) + xr)) mod q 簽名結(jié)果是( m, r, s )。 3. 驗(yàn)證時(shí)計(jì)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，則認(rèn)為簽名有效。 DSA是基于整數(shù)有限域離散對(duì)數(shù)難題的，其安全性與RSA相比差不多。DSA的一個(gè)重要特點(diǎn)是兩個(gè)素?cái)?shù)公開，這樣，當(dāng)使用別人的p和q時(shí)，即使不知道私鑰，你也能確認(rèn)它們是否是隨機(jī)產(chǎn)生的，還是作了手腳。RSA算法卻作不到。
標(biāo)簽： Algorithm Signature Digital Schnorr
上傳時(shí)間： 2014-01-01
上傳用戶：qq521
非常好的優(yōu)化算法的書，詳細(xì)介紹了蟻群算法和粒子群算法以及相關(guān)的matlab工具箱，講了理論和應(yīng)用給出了工具箱的下載地址。 Swarm intelligence is an innovative computational way to solve hard problems. In particular, particle swarm optimization, also commonly known as PSO, mimics the behavior of a swarm of insects or a school of fish. If one of the particle discovers a good path to food the rest of the swarm will be able to follow instantly even if they are far away in the swarm. Swarm behavior is modeled by particles in multidimensional space that have two characteristics: a position and a velocity. These particles wander around the hyperspace and remember the best position that they have discovered. They communicate good positions to each other and adjust their own position and velocity based on these good positions.
標(biāo)簽： 優(yōu)化算法
上傳時(shí)間： 2014-01-26
上傳用戶：zgu489
The usage of devices in a communication network requires configuration of the device parameters and communication facilities. CANopen defines a standardised way to access these parameters
標(biāo)簽： communication configuration parameters requires
上傳時(shí)間： 2013-12-23
上傳用戶：wangzhen1990
MSP-FET430P140 Demo - USART0, SPI Interface to HC165/164 Shift Registers Description: Demonstrate USART0 in two-way SPI mode. Data are read from an HC165, and same data written back to the HC164. ACLK = n/a MCLK = SMCLK = default DCO = UCLK0 = DCO/2 * USART0 control bits are in different SFR s from other MSP430 s *
標(biāo)簽： Description Demonstrate Interface Registers
上傳時(shí)間： 2013-12-28
上傳用戶：懶龍1988
The download includes the kernel source code, and a demo application for EVERY RTOS port. See http://www.freertos.org/a00017.html for full details of the directory structure and information on locating the files you require. The easiest way to use FreeRTOS is start start with one of the demo application projects. Once this is running the project can be modified to include your own source files. This way the correct files and compiler options will be automatically included in your application. + The Source directory contains the real time kernel source files for every port. The kernel itself is only 3 files. + The Demo directory contains the demo application source files for every port. + The TraceCon directory contains the trace visualisation exe file. See the readme files in the respective directories for further information.
標(biāo)簽： application download includes kernel
上傳時(shí)間： 2016-08-24
上傳用戶：zhyiroy
Java MP3 Player, Here s a list of features: - Reads, creates, updates, and removes id3v2.3 and id3v2.4 tags - Reads, creates, updates, and removes id3v1 tags - Extracts MPEG data such as bit rate, sample rate, channel mode, etc. - Calculates playing time of mp3 from mpeg information (no good w/VBR) - Can read and create Winamp styled playlists - Offers other utility classes such as MP3FileFilter and MP3Comparator - NullsoftID3GenreTable object keeps a list of genres for you and can automatically determine the id3v1 genre from an id3v2 string or the other way around
標(biāo)簽： and features creates updates
上傳時(shí)間： 2014-11-21
上傳用戶：qq521
迭代自適應(yīng)Simpson，Lobatto積分 In almost every standard book on numerics quadrature algorithms like the adaptive Simpson or the adaptive Lobatto algorithm are presented in a recursive way. The benefit of the recursive programming is the compact and clear representation. However, recursive quadrature algorithms might be transformed into iterative quadrature algorithms without major modifications in the structure of the algorithm. We present iterative adaptive quadrature algorithm (adaptiveSimpson and adaptiveLobatto), which preserves the compactness and the clarity of the recursive algorithms (e.g. quad, quadv, and quadl). Our iterative algorithm provides a parallel calculation of the integration function, which leads to tremendous gain in run-time, in general. Our results suggest a general iterative and not a recursive implementation of adaptive quadrature formulas, once the programming language permits parallel access to the integration function. For details the attached PDF file Conrad_08.pdf.
上傳時(shí)間： 2014-10-25
上傳用戶：xc216
At can be given its arguments in a file. You can comment out lines by preceding them with either # or - characters. This is an easy way to temporarily disable some commands. The CONTINUE-command is most useful at the end of the file. When this command is read, the file is started again from the beginning. You can use it situations where the machine is not shut down for the night and you want to run some commands every day.
標(biāo)簽： can arguments preceding comment
上傳時(shí)間： 2013-12-11
上傳用戶：comua
developing web applications with coldfusion express The coldfusion web application sever provides the fastest way to integrate browser sever ,and database technologies into powerful web applications and interactive web sites.
標(biāo)簽： coldfusion applications application developing
上傳時(shí)間： 2016-10-16
上傳用戶：eclipse
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