I failed a course, and the system became my study supervisor.

Chapter 26 Divergence and Integration

Regarding the issue of the main attack, the team members discussed it many times in the group, but they never came to a conclusion.

Xu Ling, the team leader, saw it all and was worried.

So, after several attempts at time coordination, Xu Ling finally found a suitable time and gathered the team members for further discussion at the Youth Home Cafe.

“It’s good for everyone to speak freely.”

Xu Ling gradually acted like a captain and started the conversation.

"Let's take the first question in the selection, which is about judging the number of balls by the sound. It seems a bit easier."

Huang Yunfeng was the first to put forward suggestions.

Unexpectedly, Mu Yuhan immediately retorted:

"That problem may seem simple, but there are actually many things to consider, and the error is very difficult to control. Also, once the number of balls increases, how do you handle it?"

Huang Yunfeng was speechless.

The truth is exactly as Mu Yuehan said, and Xu Ling also thinks so.

"What about the giant sounding plate? Studying the cause of the loud and unusual howling noises made by the large, thin plates when they bend."

Ji Yun thought about it and asked another question.

However, Mu Yuehan still refuted, and her tone was very aggressive:

"This question, haha, not to mention the difficulty of accurately capturing the characteristics of sound, do you know how many experiments are required to analyze different materials, different properties, and different sound-producing conditions? How difficult is the physical analysis of specific sounds?"

Mu Yuehan was right, these problems did exist, but the way she expressed them was still a bit inappropriate.

Ji Yun's face turned red the moment she heard this.

For a moment, no one dared to speak.

The situation became awkward.

Finally, it was Xu Ling who spoke: "Mu Yuhan, which one do you think is the best?"

Mu Yuhan paused and said in a deep voice, "I think the magnetic levitation question is a good one. It's relatively simple and easier to handle."

But Xu Ling didn't nod, instead he pointed out the difficulty of this problem:
"Heh, this question seems simple, but do you think you can easily build that experimental setup? Do you think the parameters and stability of the various materials are easy to control? Furthermore, don't you know how complex the motion associated with electrodynamics is? Are you going to solve those equations of motion?"

Mu Yuehan also fell silent. She had to admit that she had not considered the issues raised by Xu Ling.

After taking a breath, Xu Ling continued slowly, "None of these issues are easy to deal with. If we continue discussing them like we are now, all of them will be rejected.

What we are doing now is brainstorming. The requirement of brainstorming is that we cannot comment on others for the time being. After all opinions are gathered together, we will analyze them one by one and find the best one.

Mu Yuhan, what do you think? "

When they heard Xu Ling directly call out Mu Yuehan's name, the other people in the group were a little surprised. They didn't expect that this seemingly kind team leader would be so strong.

Mu Yuehan felt a little embarrassed when he was called out. He didn't expect that he would be taught a lesson by a student one grade younger than him.

But thinking about the negative impact she had just caused, Mu Yuehan finally nodded and acknowledged what Xu Ling said.

After all this commotion, efficiency was greatly improved, and everyone made their own choices based on what they thought.

Huang Yunfeng: The problem of detecting the number of small balls in blind boxes.

Ji Yun: The problem of sound produced by bending thin plates.

Mu Yuehan: Magnetic levitation issues. Liang Xiuyuan: Efficiency issues of juicy solar cells.

This juicy solar cell, actually called a Gratzel cell, is made of conductive glass, iodine, titanium dioxide, and fruit juice. That's why it's called a juicy solar cell.

Xu Ling chose the water drop lens problem mentioned in the previous selection.

This problem is also very simple, and of course it is simpler than the problem of magnetic levitation.

Now, Xu Ling has five alternative questions in his hand, but which one to choose as the main attacking point is still undecided.

“Now that we have a preliminary selection, do you have any good methods to filter out the most appropriate questions?”

Xu Ling threw the question to everyone.

Several people fell into deep thought and no one answered for a long time.

Just when Xu Ling was about to speak, Liang Xiuyuan, who had been very quiet, spoke first:

"I once took a course at the School of Management out of interest. I remember the teacher mentioned a method to help people make the best decisions. I think it was called Topsis."

Huh? This hits a point in Xu Ling's knowledge.

Xu Ling immediately became interested and asked him to continue.

The others also looked at Liang Xiuyuan with interest.

"The basic idea of ​​the Topsis method is to first imagine an optimal solution and a worst-case solution. Then, for each solution to be evaluated, calculate its distance from the optimal and worst-case solutions. This distance is then used to calculate a relative fit data. The closer the distance is to 1, the more optimal the solution is under this setting."

Still feeling very abstract, Xu Ling continued to ask, "How is this so-called distance calculated?"

Liang Xiuyuan continued:

"We first need to determine a set of indicators, and then assign a weight to each indicator for each solution. The distance calculation is similar to the distance between vectors, but it has its own formula. Relative fit also has a formula."

Now Xu Ling understood that this method should not be difficult to operate, so he immediately called on everyone in the team to start the first evaluation.

First, determine the indicators.

After discussion among several people, the difficulty of experimental operation, difficulty of experimental optimization, theoretical value, and difficulty of theoretical derivation were selected.

Each indicator of each plan is scored. Since different people consider different things, the final average is taken.

For example, when detecting the number of balls in a blind box, the scores given by the crowd are: 9, 5, 7, 7.

I gave the experiment operation difficulty a score of 9, which does not mean that the operation is difficult, but rather that it is simple.

Soon, the five-member team completed the entire Topsis process step by step.

The final question chosen surprised the other members of the group. It was the water drop lens problem proposed by Xu Ling.

But this method was proposed by Liang Xiuyuan, so there is naturally no possibility that Xu Ling could operate behind the scenes.

Xu Ling was very satisfied. Being able to study the problems he wanted to study was undoubtedly the happiest thing in the world.

As for the remaining four problems, they were certainly not ignored. Xu Ling downgraded their priority to the second level. As for the other ten or so problems, their priority was downgraded by another level.

"Alright! Today's mission is successfully concluded. Thank you all very much for coming and thank you for your willingness to use your brains to think. That's all for today."

After Xu Ling gave a summary in a pretentious tone, everyone dispersed.

The next time we meet will probably be in the lab!

(End of this chapter)