自考04735数据库系统原理课后答案及重点总结

本文档是我好久才搜到的，主要是讲IPOPT的matlab的接口设置，希望对大家有用

mlx90614红外测温传感器,使用stm32f103rct6实现，使用LCD屏幕显示。mlx90614红外测温传感器,使用stm32f103rct6实现，使用LCD屏幕显示。

实现Logistic Regression的开源代码，LBFGS应该是目前普遍被采用的一种方法，代码简洁，注释详细，不得不拥有！

(1)背景：企业报刊订阅管理系统(2)主要实现以下功能：1)录入功能：对于管理员，包括新用户信息和新报刊信息的录入功能，信息一旦提交就存入到后台数据库中；录入订阅人员信息、报刊基本信息；普通用户自行登录进行修改一些个人信息。2）登录功能：登陆系统为身份验证登录。分为管理员登录和一般用户登录。分别通过不同的用户名和密码进入报刊订阅管理界面。3)订阅功能：订阅人员订阅报刊（并计算出其金额）；4)查询功能：用户可以查询并显示自己所订阅的信息；管理员可以按人员、报刊、部门分类查询。查询出的信息显示在界面上。5)统计功能：管理员可以按用户、部门、报刊统计报刊的销售情况，并对一些重要的订阅信息

基于Matlab软件，实现了语音识别中的DTW算法，DTW算法使用了时间伸缩技术，解决了以前语音识别中，训练模板和参考模板帧长不一样的问题

板子自带： 三颗按钮【1.flash, 2.reset, 3.user】 DHT11 温湿度传感器 / DHT12 RGB 三色LED 单色LED 蜂鸣器 ESP8266-12E/F固件下载：http://www.micropython.org/download#esp8266源代码仓库：https://github.com/mokton/ESP8266_MQTT_OneNet 【最新】 请移步Github查看源代码，持续更新中，欢迎 Star主要使用了两个库： 1. urequests.py 实现 HTTP 协议 2.

基于MATLAB／Simulink的光伏电池建模与仿真

在电力电子装置中的一个重要组成部分,输入连接到控制电路的PWM信号输出端，输出连接到装置各IGBT的门极和发射极，将装置中的控制电路产生的数字PWM信号进行隔离传输和电平转换和功率放大,实现控制电路对IGBT进行开通和关断动作的控制，从而实现装置的功率变换功能。InfineontechnologiesIGBT Gate Drive: Power Suppliesa Gate driving voltage for IGBT+15Vturn-on is normally +15VDriver>□1a Gate driving voltage for IGBTOVturn-off can be oV or negativeWith Single Power Supply5V to-15V)a Negative gate driving voltage+15Vhelps IGBt switch off fasterremain in off state but itDriverneeds dual power suppliesOVWhether to use oV or negativegate driving voltage depends15VWith Dual Power Supplieson the requirement on costZH Liang - Al APperformance05Dec2003agefor internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: InterfaceOpto-couplers is commonly used as interfacingdevices for applications where both signaltransmission and potential isolation are requiredOpto-couplers offers reliable isolation between IGBT(high-potential)& micro-controller(low-potential)Opto-couplers has long signal delay(us)and isexpensiveIsolation +VDpCCMicroDrivercontrollerZH Liang - Al AP05Dec2003Page 6for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Half-bridge DriveStandard configuration: 2 drivers, 2 power supplies, 2 opto-couplersAdvantages: standard, reliableDisadvantages: using opto-couplers, higher system costIsolation +VDDlCC1DriverCC1MicrocontrollerDD2+VCC2DriverCC2ZH Liang - Al AP05Dec2003Page 7for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Half-bridge DriveIn half-bridge IGBT drive, opto-couplers offer two functions(1)safety isolation &(2) shifting the potential of the gatesignal from uc potential to high-side potentialIf safety isolation between IGBT& micro-controller is notneeded, then"Level Shift" can replace opto-coupling andrealize function(2)OptoHigh-sideHigh-sidecouplerDriverIGBTMicro-Opto-LoW-sideLow-sidecontrollercouplerDriverIGBTZH Liang - Al AP05Dec2003Page 8for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive Level shiftI FeaturesHVc(600V/1200V)沿PULSERFILTERShort Signal DelayPULSE■Cost- effectiveGEN■ No Safety Isolationevel Shift Half-bridge DriverI BenefitHigh-side““°IGBTO Saving Opto-couplersLevel(lower system costShiftMicro● Wider range ofcontrollerLevelLow-side■■■■■直■口m留■Switching FrequencyShiftIGBT(higher flexibility)ZH Liang - Al AP05Dec2003Page 9for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: CLTNEWO CLT-Coreless Transformer (for signal transmissionu Coils(Primary Secondary Side)realized on SiliconO Short Signal Delay (allowing high or low switching frequencyu Lower Cost(compared to 1200V level-shift driver日 Safety IsolationCLT Half-bridge DriverHigh-sideCLT Single DriverIGBTCLTMicro-controllerCLTIGBTMicro-controllerLoW-sideIGBTZH Liang - Al AP05Dec2003agefor internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Boot-strapBoot-strap circuit includes only a diode and a capacitora In half-bridge drive, the boot-strap circuit can replace the high-sidepower supply and make single-supply operation possibleWhen the low-side IGBT (or FWD)is on, the diode is forwardbiased and the capacitor is charged by the low-side power supplyvia the low-side IGBT and stores the energyWhen the low-side IGBt(and FWD)is OFF, the diode is reversebiased and blocks the dc-bus voltage to protect the low-sidecircuit. Meanwhile, the capacitor supplies energy to the high-sidedriverThe boot-strap capacitance should be high enough to keep thesupply voltage stable Capacitance needed can be calculatedbased on the working conditions and device parametersZH Liang - Al AP05Dec2003agefor internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Boot-strap circuitConventional2心菲*|■3 high-side power supplies■1|oW- side power supplyUsing boot-strap circuit心体心心●3 diodes& capacitorso 1 low-side power supplyFeaturesa Diode: ultra-fast recoverya Capacitor: general-purposed ITAa Dependent on low-side IGBTBenefitsSaving 3 PS(transformer cost)22ZH Liang - Al AP05Dec2003Reducing wiring connectionPage 12for internal use onlyInfineon Technologies Asia Pacific

进程调度模拟设计--先来先服务、强占式短进程优先算法

很好的一份资料，有利于入门，希望大家从中得到帮助。