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Fouriers derivation of the ct fourier transform x(t)-an aperiodic signal view it as the limit of a periodic signal as t→∞ For a periodic signal the harmonic components are spaced Oo=2π/ T apart. AsT→∞,Obo→>0, and harmonic components are space
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Can be continuous Trajectory of a space shuttle Mass density in a cross-section of a brain · Can be discrete dNa base sequence Digital image pixels Can be 1-D,2-D,·N-D For this course: Focus on a single(1-D) independent variable which we call“time
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Question: Are there sets of basic\ signals so that a) We can represent rich classes of signals as linear combinations of these building block signals b) The response of ltI Systems to these basic signals are both simp and insightful Fact: For LtI Systems(CT or dt) there are two natural choices for these building blocks Focus for now:
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 Introduction-Why we need state estimation in power system  Problem Formulation  Case Study  Advanced topics:  Hybrid Power System State Estimation (with SCADA and PMU)  Placement of Meters  Power System Sensor Network
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第一部分 网络概述 计算机网络的拓扑构型 计算机网络的组成与结构 计算机网络的定义与分类 计算网络的形成与发展 典型的计算机网络 第二部分 协议 网络参考模型OSI 网络互联设备 局域网技术 广域网协议 与Internet提供的主要服务 TCP/IP
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3.1 X(eo)=2xnJe-jon where x[n] is a real sequence. Therefore X(e)=Rl∑xnlo/。 ∑xR(-mu)=∑ x[n]cos(on),and xmm)=m∑刈nm∑刈mc-m)=-2 xn] sin(oon) Since cos(on)and sin(on)are, respectively, even and odd functions of o, Xre(eJo) is an even function of o
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 5.1 Principles of I/O hardware I/O硬件原理  5.2 Principles of I/O software I/O软件原理  5.3 I/O software layers I/O软件层次  5.4 Disks 盘  5.5 Clocks 时钟  5.6 Character-oriented terminals 面向字符的终端  5.7 Graphical user interfaces 图形用户界面  5.8 Network terminals 网络终端  5.9 Power management 电源管理
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 Introduction  Concept of Reactive power in power system  Control and management of reactive and voltage  Difference between active power & frequency regulation  Importance of voltage control  Measures for voltage control  Rules of reactive compensation and voltage control  Excitation control of generator
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一、(12分)已知某连续时间信号x(t)的波形如图所示。 1.画出信号x1(t)=x(2-2t)+x(t-1)的波形;x( 2.若x(t)的频谱是X(),试用X(a)表示信号x(t)的频谱
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⒈一些基本概念 ⒉主要内容 ⒊课程意义 ⒋学习本门课程应注意的问题 ⒌教材及参考书
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