Qualifying Exam Part A的到来

2015-01-13

　去年底收到了系里的邮件，说2015年1月22号晚上6点-9点考EE PhD的Qualifying Exam。这邮件让我「心神不宁」了一个寒假。每天惦记着，数着还剩下多少日子。

QE简介

　似乎每个Engineering的PhD都有这个考试，ECE的形式是这样的：

可选科目

　在以下十个科目里选四个：

Fundamental Areas

• Circuit Fundamentals / 电路分析基础
• Digital Logic Fundamentals / 数字电子技术基础

Focus Areas

• Computer Architecture / 计算机组成技术
• Computer Networks / 计算机网络
• Control / 自动控制原理
• Electromagnetics / 电磁场
• Electronic Devices / 电子器件( 模拟电子技术 )
• Microelectronic Circuits and VLSI / 微电子技术与集成电路
• Power Systems / 电机学、电力电子
• Signal Processing & Communication / 信号处理&通讯

　难度局限在本科的范围内。其中基础类里面至少选一门。平均每门45分钟，共计3小时。考试时候会发10个科目的卷子，自己选择其中4份来写。

评分标准

　每个科目单独判卷，各25分，一共100。每门课都到50%了就算通过了整个考试。没有达到该科目50%的，需要重修本科的相关课程，如果四门课均不到25%，劝退。

我的选择

　本科的东西，经过大四一年，已经快灰飞烟灭完了，只好选择当年拿手一些的，复习起来会快一些。想想当年计算机组成技术考了96，算除了体育以外的最高分了，自我感觉还不错。后来翻了一下推荐的教材，发现内容差了好远，基本上是要预习而不是复习了，只好给放弃了。以前数电考93也还行，就决定下来了。power方面可能还算比较在行，本科研究了一段时间。最后一门想了一阵，好像都不太好决定，但是自控的资料比较丰富，于是……

　最后选了四门是：电路，数电，Power，自控。

　下面是那四门科目的具体介绍，可以随便看看。

详情

Circuit Fundamentals

• Fundamental laws and theorems associated with electric circuits, including Kirchhoff’s current law and Kirchhoff’s voltage law, power balance, Thevenin’s theorem and Norton’s theorem;
• Circuit analysis methods and techniques, including node-voltage analysis, mesh-current analysis, and superposition;
• Two port networks and transfer functions;
• DC analysis;
• AC analysis including sinusoidal steady state phasors, s-domain representation including high-pass, low-pass, and band-pass filters;
• Transient analysis including first-order and second-order circuits;
• Current-voltage characteristics of elements including independent and dependent sources, resistors, capacitors, inductors, transistors, and operational amplifiers;
• Analysis of circuits consisting of interconnections of such devices.

Digital Logic Fundamentals

• Boolean algebra;
• Boolean minimization using Karnaugh maps;
• Fundamental logic gates;
• Combinational logic design;
• Operation and structure of standard logic components (e.g., decoders, encoders, multiplexers, registers, counters, binary adders);
• Programmable logic devices (PLAs);
• Flip-flops and latches;
• Sequential system fundamentals and state machines;
• Synthesis of synchronous sequential circuits;
• Timing diagrams;
• Arithmetic operations and circuits (addition, subtraction);

Power Systems

• Per unit system;
• Delta and wye connections;
• Single and three phase power;
• Induction and synchronous machine models;
• Operation and application of motors and generators, single and three phase transformer models;
• Single and three phase uncontrolled and controlled rectifiers;
• Single and three phase inverters;
• Choppers;
• DC to DC converters;
• Variable voltage and frequency drives;
• Losses and efficiency;
• Load flow input and output, symmetrical components.

Control

• Mathematical models of systems;
• Feedback control system characteristics and performance;
• Sensitivity;
• Time and frequency responses;
• Laplace transform analysis of time-invariant systems;
• Stability;
• Root locus method;
• Nyquist criterion and Bode plots;
• Design and compensation.

　3小时考这么一堆东西，信息量真是大到不行。复习的资料还是有的，据学长说法是把题刷完应该过没什么问题，但是考高分的话最好看看书。

　暗无天日的备考日子已经过了一大半，勉强按预期进度完成。恍惚间有这样一种感觉：上学期挂了4门课，开学的时候要补考，假期要好好复习……虽然本科没挂过科，但是现在的经历似乎丰富了这一体验。

　哎，继续熬完再说吧。考完之前应该没空写Blog了。

　祝我好运。也希望大家都好运。

LanternD

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