Today's English Class

课程冲突与英语课学习情况
因课程冲突放弃周二和周四英语课,周三英语课内容相同可参加。早上教室人少,反映出学校研究生教育不够严格。不过人少的英语课交流机会多,效果更好,还学到了一些实用短语。
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    According to the regulations of school, we have the Wednesday's classes today. Owing to the conflict with my class, I have no choice but to give up attending the English class on Tuesday and Thursday that my classmates attend. Fortunately, Mr. Lee, our English teacher, also gives 3rd-year graduate students English class on Wednesday, involving the same contents. Therefore, I can join them.

    This morning ,when I entered the classroom, I was astonished to see that there was only three students in the classroom including me. Maybe most students are still immersed in vacation, or they cannot go back to school on time on account of  the busy traffic.

    It is self-evident that postgraduate education in our school is not as strict as undergraduate education. Teachers as well as students have too much freedom: Tutors often have so-called important things so that lessons are cancelled; students ususlly attend classes by their own wishes so that situations like today's occur.

    However, the effect of English class with fewer students was better, because more opportunities of communication afford some guarantee.

    In class, I learn some useful phrases, as follows:

  • tough cookie: a person with a strong character.
  • rake in the dough: make a lot of money.
  • crash: to go to sleep.          e.g.  I've got to go home and crash.
  • out of this world: exceptional, marvelous.        e.g.  She is out of this world.
  • catch you later: goodbye. 
  • pull off: to succeed at something difficulties.     e.g.   I cannot believe you pulled that off.

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Write a C++ program that defines a class DateV2 that (1) Contains all the members in the class DateV1; Programming for Engineers C++ (2) Has two constructors as follows: One takes three parameters, int y, int m, int n; The other is the default constructor that takes no parameter (3) Has additional public member functions as follows: string getWeekDay(); // return the week day, for example, Sunday if day is 0, etc bool Leap(); // return if the year is leap int differFrom(DateV2& oneDate); // return the difference in days between the calling object // and the oneDate object void printDate(); // print the year, the month in English, the day, and the week day Test class DateV2 in the main function as follows: (1) Declare and set the objects today and tomorrow as in Problem 2. (2) Declare and initialize (by a constructor) an object to represent your OWN birthday. (3) Use the member function printDate to print today, tomorrow, and your birthday. (4) Output the weekday of today, tomorrow, and your own birthday. (5) Output how many days has passed since your birth (the difference between your birthday and today). Hint: i) We can use another string array to store the English name for week days (Sunday, Monday, through Saturday) ii) We know that it is Monday on Year 1, Month 1, and Day 1 iii) A good idea is to first design a function to compute the number of days that has passed since Year 1, Month 1, and Day 1, and then to use this function to compute the week day for a give date and to compute the difference between two dates. You can store the number of days for each of the 12 months in an integer array, which helps in counting the days.
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内容概要:本文围绕六自由度机械臂的人工神经网络(ANN)设计展开,重点研究了正向与逆向运动学求解、正向动力学控制以及基于拉格朗日-欧拉法推导逆向动力学方程,并通过Matlab代码实现相关算法。文章结合理论推导与仿真实践,利用人工神经网络对复杂的非线性关系进行建模与逼近,提升机械臂运动控制的精度与效率。同时涵盖了路径规划中的RRT算法与B样条优化方法,形成从运动学到动力学再到轨迹优化的完整技术链条。; 适合人群:具备一定机器人学、自动控制理论基础,熟悉Matlab编程,从事智能控制、机器人控制、运动学六自由度机械臂ANN人工神经网络设计:正向逆向运动学求解、正向动力学控制、拉格朗日-欧拉法推导逆向动力学方程(Matlab代码实现)建模等相关方向的研究生、科研人员及工程技术人员。; 使用场景及目标:①掌握机械臂正/逆运动学的数学建模与ANN求解方法;②理解拉格朗日-欧拉法在动力学建模中的应用;③实现基于神经网络的动力学补偿与高精度轨迹跟踪控制;④结合RRT与B样条完成平滑路径规划与优化。; 阅读建议:建议读者结合Matlab代码动手实践,先从运动学建模入手,逐步深入动力学分析与神经网络训练,注重理论推导与仿真实验的结合,以充分理解机械臂控制系统的设计流程与优化策略。
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