1. What is the scientific working principle of health code?
The health code is based on the resident ID card, which records the location information, consumption process, car and plane records, scanning site code and information filled in. Through big data analysis, you can know exactly where you are. So how does it know your location information? Let's analyze them one by one.
1 If your mobile phone turns on location information, the navigation satellite will accurately determine your location;
As long as there is a mobile phone card in the mobile phone, it is necessary to communicate with the mobile phone base station in real time, and know where you are through the number of the mobile phone base station. This is stricter than travel regulations. Travel code can record that you have been here as long as you stay in a certain area for four hours. And your location information in the health code is, as long as you come to me, record it immediately;
3 when the mobile phone uses WiFi to surf the internet, it will record your location information according to WiFi;
You spend money in shopping malls, shops and restaurants. As long as you use mobile payment or bank card payment, big data immediately records your location. Because the health code is based on your ID card, you swipe someone else's bank card to show that the owner of the bank card has spent here, not that you have spent here;
When you buy a ticket with your ID card or take a bus, train or plane, the health code can also record your position and action track. In the same period of time, people with the same trajectory or location as you, infected people or suspected infected people, big data will change all the health codes of all relevant people.
So the health code does not prove your health status. It shows whether you have been to a dangerous area, or whether you have had contact with infected people or suspected infected people in a place or space. It can only prove where you have been, not that you have been exposed to danger or been infected.
Second, the meaning of the three colors of health code:
The green code means that you have no symptoms of infection at present, are healthy and normal, and can stay and return to work. The yellow code means that you have had non-close contact with the confirmation personnel, or the formation position is close at the same time. If you punch in the safe area for seven consecutive days, the health code will change from yellow code to green code; Red team refers to confirmed patients, suspected patients, asymptomatic infected people and people who are in close contact with confirmed patients and medical observers. These people are all in the state of red team. In a healthy state, red team can only be converted into a green code after 4 days of continuous health punching/kloc-0 in the safe area. If a person with a yellow code or red team arrives in a low-risk area to live, the arrival time will be automatically recorded as long as the mobile phone is turned on, and the person who has not become a close contact or case within 14 days will be isolated, and the health code will turn green automatically after 14 days. Remember that "Green Code Travel" and "red team Yellow" are isolated.