psychochemist

Chapter 259 Extra Story: Mathematical Hero——Zhao Jin 2
The darker the sky, the more dazzling a little spark will be.Starlight is also easier to gather together in the dark night, giving off a shining light.

Zhao Jin squeezed out against the flow of people, he wanted to see who the old man was looking for when he shouted so hysterically.

"Ma Yimin! Ma Yimin! Cough cough..." The old man had already cried out to the point of coughing, the veins on his forehead were exposed, he frowned and stomped his feet, and there were still some anxious tears in the corners of his eyes.

People passing by here were in a hurry, and everyone cast a concerned look at the old man, but because everyone had to hurry, no one could give a helping hand.

Zhao Jin stepped forward and asked the old man with concern: "Uncle, are you looking for someone?"

The old man stopped shouting, panted, looked Zhao Jin up and down, and said, "Young man, my grandson is lost. What should I do, what should I do?"

ah?Child lost?This is a big deal!Zhao Jin hurriedly asked: "How old is the child? What's going on?"

The old man said incoherently: "Boy, two years old. I bought something, but he lost it. I went to the canteen next door to buy cigarettes, and asked him to look after my luggage at the entrance of the canteen. When I came out, there was no one there, but my luggage was here."

Zhao Jin asked: "How long have you lost it? Why are you here?"

Old man: "I haven't seen my baby for half an hour."

Zhao Jin: "Did you call the police?"

The old man said anxiously: "Isn't the child missing for 24 hours before calling the police? Didn't call the police."

Zhao Jin took out his mobile phone and dialed 110, saying, "Who said you have to wait 24 hours before you go missing before calling the police? Call the police immediately."

Zhao Jin dialed the police number and explained the situation concisely: "A two-year-old boy is missing here. We are now at the A4 ticket gate of Chengbei Passenger Station. Yes, you can contact me."

After hanging up the phone, Zhao Jin comforted the old man: "Don't worry, we have already called the police, and the police will help us."

The old man was still in a hurry, and said to himself: "I just asked the canteen to check the surveillance for me, and then I came to the place with the most traffic and waited here. Hey, what should I do, what should I do?"

Zhao Jin looked around the surrounding environment, then glanced at the time on the phone, and opened the phone map.A three-dimensional coordinate axis appeared in my mind, and data deduction started:

If the child is lost by himself, the limit moving speed of a two-year-old child is about one meter per second, and if the physical strength attenuation and speed loss step functions are included at 90%, 73.5%, and 60.3%, then the limit distance of movement is... In this case In this case, there are two toy stores and 64 snack bars nearby... The probability of children being attracted to these facilities is about [-]%. When no adults are around, the probability of being attracted is halved according to the deduction function of psychological safety. , so the probability of appearing in these places is...

If the child is taken away maliciously, the limit movement distance of the child will be greatly increased.According to big data statistics, with the lost location as the center of the circle, within one hour, the moving distance may reach [-] kilometers.

…………

Zhao Jin's brain is like a brain, throwing the data in front of him into the brain for processing, and then come up with an optimal solution.

Seeing that Zhao Jin was in a daze and muttering something, the old man anxiously tugged at Zhao Jin's sleeve and asked, "Young man, what should I do? What can I do?"

Zhao Jin said seriously to the old man: "Uncle, can you find fourteen people?"

The old man was puzzled: "Yes? What is this for? I called my family just now and asked them to help me find it."

Zhao Jin explained: "Don't worry, according to big data statistics, the four to 10 minutes after a child is lost is the most critical, known as the 'golden four to 10 minutes' rule! Don't waste your manpower looking for it, use my method Look for it, the probability of finding it is higher.”

The old man listened carefully.

Zhao Jin said carefully: "The next thing I'm talking about is the 'Ten People and Four Pursuits' created by Professor Wang Dawei of the People's Public Security University of China. You go to the lost place and stay where you are, and then mobilize 10 relatives and friends to search in four directions. The search is divided into thick and thin layers: the coarse search is within 4 kilometers, and quickly chase along the road, which requires 2 people, that is, at least one person in one direction to go out and chase quickly. The fine search is within 4 kilometers, to the There are more than 1 people to look for at the main train station and bus station. The reason for this is that sometimes after the gangster takes the child away, he will rush to the train station or bus station, buy a ticket and get on the train immediately. So we have to compete for time and speed, and if we can be faster than him, we can stop him. There was once such a real case, that is, after the mother lost her child, she immediately organized people and chased them separately. As soon as she arrived at the train station, the crime Molecule was checking the ticket, and he was dragged back. In "Ten People and Four Chasing the Law", except for 2 people, what did the other 4 people do? One went to communicate with the police, and the other stayed at home. Because there were When the time comes, the child can find a home by himself.”

The old man memorized everything, and immediately called home to organize someone to look for it.

Zhao Jin looked at his watch and prayed silently in his heart, because half an hour had passed, and the lost point was already at the station, which undoubtedly added a lot of variables, no, I still have to continue the deduction.Zhao Jin closed his eyes, doubled the three-dimensional coordinate axis in his mind just now, and added one more dimension, turning it into a four-dimensional coordinate axis. At the same time, he simulated the function of the time variable in his mind...

At this moment, the police arrived in time. They were two very young policemen. They rushed over immediately after receiving the notice from their superiors.The old man told the two young policemen about the situation again...

During the whole process, Zhao Jin did not interrupt, but kept deducing the mathematical model in his mind.

After listening to the old man's introduction, the police frowned and discussed countermeasures.

Policeman A: "It's the end of the year, and child abduction and trafficking cases are becoming more and more frequent."

Policeman B: "Yes, this is already the fourth case we have received this month."

When the old man heard it, he immediately became anxious and asked in a panic: "Ah? Then... what should I do? Can... can I get it back?" Horrifying answer.

The two policemen looked at each other, did not answer directly, and said, "don't worry, sir, we will do our best to help you find it."

After hearing this, the old man knelt down on the ground with a plop, tears came out, and he begged heartbreakingly: "Comrade police, please save my grandson! I beg you to find my grandson, otherwise I will I don't even know how to live."

Policeman A helped the old man up and said, "Please don't worry, we will try our best. You should also control your emotions and think about whether there are any clues?"

The old man pointed to Zhao Jin next to him, and said, "This guy helped me plan a tracing plan."

Who is this?The two policemen looked at Zhao Jin, Zhao Jin was still thinking about something with his head down, chanting words.

　Give me five coefficients, and I will draw an elephant; give me six coefficients, and the elephant will shake its tail——Zhao Jin

　　
　
(End of this chapter)