Listen Well, You Guys Won't Understand Either Way
Chen Fan stood on one side of the conference room, and there were some forensic doctors sitting on both sides.
Everyone was dressed in a white coat and looked very serious. It could be seen that they took this meeting very seriously.
"A meeting?" Chen Fan asked. I'll give a speech alone, right?"
Liu Xi said," Yes, your fingerprint restoration still needs to be confirmed. This project has been proposed by too many people. Now that there is progress, everyone wants to try it out and hear if there is a new direction."”
"Do you understand?" asked Chen Fan.”
Arrogant, simply arrogant.
" These people have dissected thousands of corpses," the director said." They have handled many cases. Their fingerprints are countless. How is it possible…"
An old man pushed up his glasses and said,""We'll do our best to listen,"
The bureau chief immediately shut up.
Chen Fan said," Actually, the method is very simple. First of all, we have to understand the direction of the growth of fingerprints. This is biological knowledge. You should know a little about this."”
The big guy nodded slightly. A few people who didn't understand biology didn't nod.
Chen Fan said," Sigh, don't be like this. I really can't tell you. Biology is the foundation. To recover fingerprints, we must understand the direction of growth of fingerprints, which is why fingerprints exist.”
"If you don't understand, don't ask. Record it down yourself and go back to tutor yourself.”
Wang Yanan, who was standing near the door, suddenly had an illusion. It was like when she was in school, the teacher was explaining math problems to her.
It was as if in the next second, if he was stunned for a moment, he would directly evolve from the dinosaur era to the future world.、
Everyone looked at Chen Fan.
Chen Fan continued," There are two criteria for fingerprints. Everyone's fingerprints are different. The second is the principle that fingerprints remain unchanged for life. That is, on the day you die, fingerprints can still be determined.”
"What's a characteristic point? Everyone knows that there are four forks, and each fork has a hundred characteristic points."
"Starting point, ending point, fork, and union. Each fingerprint had about 100 feature points. After combining and arranging, it was calculated to the power of 4100 (4100) to get a 61-digit number, which was 4100=1.6*1060 combinations. Then, based on the population of about 5 billion people living in a century at that time, each person had ten fingers, a total of 50 billion (5*1010) fingerprints. Therefore,(1.6*1060)/(5*1010)=3.2*1049 This formula meant that it was possible to have two duplicate fingerprints after a 50-digit century. The similarity rate of fingerprints is only one in six billion. Even if there are more than six billion people in the world, from the perspective of genetics and statistics, it will only appear once every 6000 years on average."
Wait a minute, he was talking about biology, right? Now he was talking about genetics and statistics, right?
Everyone looked at Chen Fan's formula and Chen Fan continued,""Then, how can we reduce this ratio? The method I used was actually a screening method, which you can understand as mathematics.”
Chen Fan thought for a moment and said,""The fingerprints in every region have similar points, and the fingerprints in every country have similar points. We can mark the similar points and quickly locate this person's area.”
Chen Fan turned on his computer.
He waited silently for a minute. Not bad, the computer was turned on.
Connecting to the intranet, Chen Fan took out a few fingerprints and said,""What I'm seeing now is a random fingerprint. How do I reduce it?”
"Here, here, and here. These forks are all shockingly similar, but why are they different? The starting point is here.”
"This place is called the fifth fork."
" The fifth fork point changes. There are many trajectories, but compared to these, there are fewer. The fork point changes, and the fingerprints begin to change. Although the theoretical probability of this change is infinite, mathematics can calculate a number…"
Chen Fan said very seriously, and he felt that he was speaking very slowly.
However, no one below understood what he meant.
The director whispered to the forensic doctor beside him and said,"What part of it don't you understand?”
" After biology, I started to get confused…"
You didn't understand what happened after that, did you?
Chen Fan took out half a fingerprint and said,""This is the fingerprint we found that day. I put in the area fingerprint, age, weight, height, and other factors, and then I got a number.”
" Comparing the numbers to the fifth intersection point, we can find the direction of development. Then, this line will do…"
"Doesn't that mean that we need a lot to complete the restoration?" Someone raised his hand and said.”
" Wrong," Chen Fan said." I only need to find seven. Half a fingerprint has four. I just need to find three more."”
"What if it's half? What if you don't have a single characteristic point?"
Chen Fan frowned and said," Which department does this young man belong to? Throw him out? What kind of problem is this? You don't have a single characteristic point. Just say that it's a blank piece of paper without fingerprints. How can I restore it if you don't have fingerprints? I'm restoring it, not casting spells for you.'
The man sat down silently. The teacher beside him rolled his eyes at him. You really made me proud.
Chen Fan said," I like the seven feature points very much. So, I only need to recover a few feature points, and then put them in the fingerprint database to start the comparison."”
"Is it easy for you to do what you did?" asked the director.”
"It's very difficult. I'm the only one in the world who can do it.”
It's as if you didn't say anything.
Chen Fan said," But I will list the changes of the fifth intersection point into a table coefficient. When the time comes, we can find the corresponding changes according to the coefficient. With this change, we can recover the fingerprint by eighty to ninety percent..."
Was eighty or ninety high?
Very high, how high?
He could basically find the person.
"Can this be used as evidence?"
Someone asked.
Chen Fan said," No. There are errors and I haven't been recognized. Besides, I don't want to be recognized. After all, it's useless to determine someone's guilt.”
"Then this intersection…"
" Chief, I need a computer," Chen Fan said." Also, my forensic department really needs fingerprint equipment."”
"I can get you the best computer. Don't even think about the equipment…"
"Then point it out for me. I can assemble it myself later, right…"
The chief was about to say something when the forensic doctor said," He agreed. We'll provide it to you, but the condition is that you have to tell us the assembly diagram of the assembled equipment…"
Ye Qingmei was speechless. They were all old silver coins, right? Each one of them was not at a disadvantage at all.
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