Chinese entertainment for engineering students

Wang Fei is having a great time recently.

During the day, Wang Xu would go to school, while Wang Fei was free to move around. From time to time, she would go to Lao Na's house to harass her, or she would go back to Wang Xu's house to play mahjong with Aunt Jiang and the others.

Mahjong has become very popular in the imperial capital of this era, but the gameplay is very simple and there are no complicated rules like Xiangjiang Mahjong.

Most of them are to push down the buttocks, double the self-touch, all of the same color, seven small pairs, also double, shoot the cannon and give it to everyone, self-touch, everyone will give it, simple and fast, you can get a handful in a few minutes.

We don’t have much money, so we can play for 10 or 20 cents, or even for 50 cents. Wang Fei got started quickly when she was asked to be a partner because of Aunt Jiang's misfortune, and then she became addicted to mahjong.

If it weren't for the fact that she knew how to practice every day and practiced the songs he gave her very well, Wang Xu would have wanted to enroll her in a class to quit her addiction. Since there is no delay in business, just play if you like, you are not a child.

But every night, Wang Fei would return to the small courtyard on time, bring the food cooked by Aunt Jiang, and live a two-person world with Wang Xu. This made Wang Xu very satisfied, and she felt as happy as seeing her daughter-in-law when she came home from work.

Wang Xu didn't know that many people were thinking about him, and he didn't know that more and more people were paying attention to him. Even if he knew that, he wouldn't care because he was very busy now.

He is currently busy repairing his recording equipment. He has been delayed in doing so before. The main reason is that he lacks the necessary equipment. Now that he is not going back to school, he can borrow the school's laboratory equipment.

Equipment such as electric welding and multimeters are easy to solve. After all, you can buy them if you have money. But even if you have money, you can't buy professional laboratory equipment such as oscilloscopes, signal generators, and spectrum analyzers now.

Because imported products have to wait, domestic products have to wait even more.

Imports have to wait for foreign exchange quota, ordering, manufacturing, shipping, customs clearance, etc., which can take two to three months or even half a year.

As for the domestic ones, the electronic instrument factory has not yet been reformed at the moment, and the output is limited. If you are not a state-owned enterprise or a university, then just wait. When it is your turn, it depends on your mood.

Fortunately, the labs at Shuimu University are available for rent, as long as you are an in-house employee. For students, graduate students need to apply with their supervisor, and undergraduates need to apply with the department, so it’s not too much trouble.

School has just started these two days, and there are few people doing experiments, so I have to borrow it quickly. In a few days, there will be more people.

After going through some twists and turns, Wang Xu finally got the right to use an electrical laboratory for a week. Although it cost two thousand yuan in rent, it was still a good deal. The school would also assign an experimental teacher to help keep an eye on it.

Among undergraduates, he is the only one who has a scorpion poop.

He exchanged this privilege for a paper, which was about the artificial intelligence algorithm of convolutional neural networks. The previous life was published in 1998, and there was no splash in the early stage.

It wasn't until 2010 that convolutional neural networks really became popular, and they were gradually discovered and became a generational myth. Of course, this is also closely related to the original author's 20 years of intensive work in this field. Many of his subsequent papers were based on this article.

I won’t go into the specific content. It has little to do with entertainment. Just copy the lyrics. If you copy the thesis, you might really get beaten to death by the readers.

This is one of the must-read papers for those who studied artificial intelligence in the past. It is not difficult, but it is well designed. It is very suitable for Wang Xu, who only has an undergraduate degree. There is no problem in publishing a second-district SCI.

The original work is about District 1, but he is Dr. Chou Guo, the head of a famous laboratory. As for Wang Xu, a small shrimp, he had to find a supervisor in the department to be the corresponding author if he could publish in the second district.

But even so, Mizuki was a big deal in 1991. You know, this is an era when only one SCI is needed to graduate with a Ph.D., so you know the weight of such a paper in the hearts of the teachers in the department.

(Characters such as teachers and classmates have nothing to do with reality. After all, they are not celebrities. No one will recognize them if they use them, and they can easily get into trouble.)

Today's universities are not as busy as later generations, so suddenly an undergraduate came to say that he had written an algorithm paper. This student was only a sophomore, and his professional courses had not even started yet.

The teachers were all surprised, but they still contacted Wang Xu, a returned doctor named Luo Congwen, as his tutor and asked Wang Xu to show him the paper.

Well, that’s right, Mizuki undergraduate students can also have mentors. When there are special needs, a tutor can be assigned. This is also beneficial to the tutor, considering the workload, especially for young teachers who have not yet begun to accept graduate students.

The tutor was very responsible. After reading the paper, he felt that it was very novel. It was a branch expansion of artificial intelligence and was forward-looking. It was a very good paper, so he helped him change the format and submitted it.

I even asked my mentor in Chou Country to help me to see if I could speed up the process. This is the first time he has published an article as the corresponding author, and he also wants to get off to a good start. If everything goes well, it will be good for applying for graduate students and associate professors next year.

As for the laboratory, well, it doesn’t matter if it has something to do with the thesis.

The reason is that because of that paper, Wang Xu successfully became a celebrity in the department. Leasing a laboratory, especially a laboratory that has no tasks yet, is not a problem.

It doesn’t matter because the purpose of renting a laboratory can be said to have nothing to do with the paper. When you write a paper on artificial intelligence, use the electrical laboratory to make a hammer.

Wang Xu is progressing very quickly. This time it is just maintenance and adjusting the signal-to-noise ratio.

The recording equipment can be regarded as a whole system. The sound goes in and the finished product comes out. Therefore, system engineering is a very critical technology when tuning recording studio equipment.

Friends who play Hi-Fi may have some experience. They are obviously using good stuff, but the final effect is always unsatisfactory. It is not even as good as the finished product made by some brothers who are good at playing with one-tenth of the budget.

This is a problem of system tuning, which is why Wang Xu needs advanced testing equipment such as oscilloscopes.

To put it simply, use a standard wave generator to generate a standard waveform, and then after passing through the entire system, look at the final waveform. The overall deformation is the total error of your system.

Each piece of equipment along the way will cause some changes in the waveform, but if these changes cancel each other out, a complementary result may be formed. In the end, both intermediate results are wrong, but the final result is right.

Of course the music won't be as precise as standard waves, but the compensation mechanism is similar. Wang Xu wants to use these professional equipment and his mechanical ears to repair this pile of equipment and adjust it to the best condition.

As for the signal-to-noise ratio, it is more troublesome. Wang Xu can design some special circuits to filter clutter, but this filtering will inevitably affect some normal waves, so recording equipment and audio equipment The design and manufacturing are often very mysterious.

Therefore, Wang Xu spent two full days designing several sets of filtering and amplification devices for different locations, and then connected them to the equipment respectively, and finally got a result that he was basically satisfied with.

Even if this is usable, although it cannot be compared with the top recording studios in the industry, it can be considered top-notch in China. But in Wang Xu's eyes and ears, this set of things is just usable, because he knows better.