It is an experimental testing for python M2Crypto module. M2Crypto is not well document. User may not know how to use SHA256 when signing and verify with RSA. It also have not enough document to show how to use DES to encrypt and decrypt. Here also includes source codes for performance evaluation of the algorithms. This experimental program explore all this issue and may be helpful for some one who using python for doing encryption with RSA and DES.
Recent advances in experimental methods have resulted in the generation
of enormous volumes of data across the life sciences. Hence clustering and
classification techniques that were once predominantly the domain of ecologists
are now being used more widely. This book provides an overview of these
important data analysis methods, from long-established statistical methods
to more recent machine learning techniques. It aims to provide a framework
that will enable the reader to recognise the assumptions and constraints that
are implicit in all such techniques. Important generic issues are discussed first
and then the major families of algorithms are described. Throughout the focus
is on explanation and understanding and readers are directed to other resources
that provide additional mathematical rigour when it is required. Examples
taken from across the whole of biology, including bioinformatics, are provided
throughout the book to illustrate the key concepts and each technique’s
potential.
數(shù)字控制的交流調(diào)速系統(tǒng)所選用的微處理器、功率器件及產(chǎn)生PWM波的方法是影響交流調(diào)速系統(tǒng)性能好壞的直接因素。在介紹了正弦脈寬調(diào)制(SPWM)技術(shù)的基礎(chǔ)上，設(shè)計了一種以8098單片機(jī)作為控制器，以智能功率模塊IPM為開關(guān)器件的變頻調(diào)速系統(tǒng)。通過軟件編程，產(chǎn)生正弦脈沖寬度調(diào)制波形來控制絕緣柵雙極晶體管的導(dǎo)通和關(guān)斷，從而達(dá)到控制異步電動機(jī)轉(zhuǎn)速的目的。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)可調(diào)頻率調(diào)電壓，穩(wěn)定度高，調(diào)速范圍寬，具有較強(qiáng)的實(shí)用價值
Abstract:
AC variable speed with digital control systems used microprocessors， power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology，this paper designed variable speed system which used 8098 as a controller， intelligent power module IPM as switching device. Through software programming， resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off， so as to achieve the purpose of speed control of induction motors. experimental results show that the system can adjust frequency modulation voltage， high stability， wide speed range， has a strong practical value.
為提高電容測量精度，針對電容式傳感器的工作原理設(shè)計了基于PIC16LF874單片機(jī)電容測量模塊。簡單闡述了電容測量電路的應(yīng)用背景和國內(nèi)外研究現(xiàn)狀，介紹了美國Microchip公司PIC16LF874單片機(jī)的特性。電容式傳感器輸出的動態(tài)微弱電容信號通過PS021型電容數(shù)字轉(zhuǎn)換器把模擬量數(shù)據(jù)轉(zhuǎn)換成數(shù)字量數(shù)據(jù)，所測數(shù)據(jù)由PIC16LF874單片機(jī)應(yīng)用程序進(jìn)行處理、顯示和保存。實(shí)驗(yàn)結(jié)果表明，固定電容標(biāo)稱值為10~20 pF 的測量值相對誤差在1%以內(nèi)，同時也可知被測電容容值越大，測量值和標(biāo)稱值相對誤差越小。
Abstract:
To improve the accuracy of capacitance measurement，aimed at the principle of work of mercury capacitance acceleration transducer，the design of micro capacitance measurement circuit is based on the key PIC16LF874 chip. Briefly discusses the application of the capacitance measuring circuit for the background and status of foreign researchers，focusing on the United States PIC16LF874 microcontroller features. Capacitive sensor outputed signal through the dynamics of weak PS021-chip capacitors （capacitancedigital converter） to convert analog data into digital data，the measured data from the PIC16LF874 microcontroller application process， display and preservation. experimental results show that the fixed capacitor 10pF ~ 20pF nominal value of the measured value of relative error is within 1%，but also it canbe seen the value of the measured capacitance larger，measuring value and the nominal value of relative error smaller.
提出一種基于凌陽單片機(jī)的步進(jìn)電機(jī)加減速的控制方法。采用凌陽科技推出的16位結(jié)構(gòu)工控單片機(jī)SPMC75F2413A為控制器，由Allegro公司生產(chǎn)的兩相步進(jìn)電機(jī)專用驅(qū)動器件SLA7042M構(gòu)成步進(jìn)電機(jī)的驅(qū)動電路，在傳統(tǒng)的3段直線加減速控制算法基礎(chǔ)上增加至7段S形曲線加減速過程，控制步進(jìn)電機(jī)的啟動和停止。實(shí)驗(yàn)結(jié)果表明，該控制方法克服了直線加減速中不連續(xù)、易造成系統(tǒng)沖擊的問題，整個系統(tǒng)實(shí)現(xiàn)柔性控制，電機(jī)啟動、停止連續(xù)性能提高30%。
Abstract:
The method of controlled stepping motor is referred based on SPMC75F2413A MCU， which adopts the 16 knots SPMC75F2413A MCU as the controller. The special-purpose actuation chip SLA7042M of two stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of stepping motor. The experimental results show that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control， and the performance of motor start or stop continuity is increased 30%
為提高太陽能的利用率，以ATmega8單片機(jī)為控制核心，設(shè)計了一套光電跟蹤與視日運(yùn)動軌跡跟蹤互補(bǔ)控制的雙軸太陽跟蹤器。該跟蹤器在晴天時，利用光敏電阻采集光強(qiáng)判斷太陽位置,控制步進(jìn)電機(jī)實(shí)現(xiàn)光電跟蹤；在陰天時，采集時鐘器件PCF8583的時間信息,計算當(dāng)前太陽位置來實(shí)現(xiàn)視日運(yùn)動軌跡跟蹤。實(shí)驗(yàn)表明：該太陽跟蹤器能在不同天氣狀況下對太陽進(jìn)行較準(zhǔn)確地跟蹤，能量接收效率提高了30%，達(dá)到充分利用太陽能的目的。
Abstract:
To improve the utilization rate of solar energy，a kind of solar tracking controller which effectively combined the sun angle tracking and photo electric tracking based on ATmega8is designed.In the sunny days，the solar tracking con-troller determines the sun's position by using photosensitive resistances to collect light intensity and control stepper motors to achieve photo electric tracking，n cloudy days，it collects clock chip PCF8583time information to calculate the current position of the sun and achieve the sun angle tracking.experimental results show the solar tracking controller accurately tracks the sun in different weather conditions，improves received energy efficiency by30%and reaches the purpose of full use of solar energy.
為提高溫度測量效率，降低系統(tǒng)的成本，擴(kuò)展傳輸距離，設(shè)計出一種新型溫度采集系統(tǒng)。單片機(jī)通過控制具有單總線方式的溫度傳感器DS18B20實(shí)現(xiàn)對溫度的測量，同時單片機(jī)通過控制具有單總線方式300～450MHz頻率范圍內(nèi)的MAX7044與MAX7033無線發(fā)射與接收芯片實(shí)現(xiàn)溫度數(shù)據(jù)的無線傳輸。與傳統(tǒng)溫度采集系統(tǒng)相比，該系統(tǒng)利用單總線方式連接，采用無線傳輸方式實(shí)現(xiàn)遠(yuǎn)距離通信，易于系統(tǒng)的集成與擴(kuò)展。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)結(jié)構(gòu)簡單、方便移植，能夠同時實(shí)現(xiàn)多達(dá)上百點(diǎn)溫度的測量與500m范圍的傳輸。
Abstract:
To improve the temperature measurement efficiency and reduce system cost,expansion of transmission distance,a new type of temperature acquisition system is designed.Microcontroller controlled temperature sensor DS18B20which has a single-bus achieves temperature measurement,while microcontroller by controlled the MAX7044and MAX7033chip with a single-bus and having300~450MHz radiofrequency to achieve the wireless transmission of temperature data.Compared with conventional temperature acquisition system,the system uses single-bus connected,and uses wireless transmission means to achieve long-distance communications,easy-to-system integration and expansion.The experimental results show that the system is simple,convenient transplantation,and can be implemented in as many as a hundred-point temperature measure-ment and the transmission range of500meters.
