During the epidemic period, health codes are based on real data and can be generated by citizens or people who have returned to work through online self-declaration and background audit. Two-dimensional code is a personal entry and exit in electronic certificate.
Health codes are divided into three categories: green, yellow and red, which respectively represent different levels of personal virus carrying risk. The green code has low risk and can pass by code, so the yellow code and the red code will be blocked, and it needs to be isolated for a certain period of time before they can be converted into green codes. Take Hangzhou as an example, the yellow code needs to be isolated for 7 days, and the healthy punch card will turn to green code for 7 consecutive days, the red code needs to be isolated for 14 days, and the healthy punch card will turn to green code for 14 days.
So, how is the color of the health code determined? People will fill in some personal information when applying for health code. Is it just based on this information? Will someone make a false report? In fact, the personal information provided by people themselves is only one of the reference contents. Assessing a person's risk level requires various data, such as personal action trajectory information, close contact information, regional risk degree information, etc. The sources of these data are also varied, including public security, mobile operators, communities and so on. For example, if you take the 1 bus today, the health code scanned before you take the bus will record your action track. Therefore, the function of health code is not only to detect our health status, but also to record our action trajectory. The system will compare and analyze the information entered by individuals with all the data obtained from various channels, evaluate our risk level according to the analysis results, and give different color health codes accordingly.
Will the color of the health code given by the system change? Health codes are dynamic codes, and the color status may change. For a simple example, Xiao Li was diagnosed as COVID-19. Before the diagnosis, he went to a shopping mall. Coincidentally, at the same time, Xiao Wang also went to the mall. Unfortunately, Xiao Wang's health code may turn yellow or red, because the system detects that Xiao Wang may have had contact with COVID-19 patients, so there is a certain risk of transmission.
Health code can change color so flexibly, which requires various technical support: first, big data technology. The collection, storage, analysis and integration of data are inseparable from the help of big data technology. The second point is positioning technology. On the one hand, satellite positioning, GPS, Beidou navigation system and other positioning systems will locate our mobile phones. Secondly, in general, the mobile phone is covered by signals from multiple wireless base stations, and these signals from different base stations are collected to calculate the distance between the base station and the mobile phone and locate the position of the mobile phone. Thirdly, health code is a kind of two-dimensional code, which is generated through information technology processing based on given data.
Technology companies can provide these technologies, but the data cannot be provided without the support of the government, so don't underestimate this small QR code, which has strong technical support and government support behind it.
Health Code is an innovation, which has played a vital role in epidemic prevention and control. Through the health code, what we see is the development of national science and technology, the improvement of national monitoring power and the enhancement of comprehensive national strength.
Of course, the health code is not perfect, and it may also bring some problems in the process of use, for example, how to ensure that information will not be leaked, some elderly people will not use smart phones, and people have to scan different health codes when they go to different places.
At present, the epidemic prevention and control tends to be stable, but the epidemic prevention measures cannot be relaxed. Let the health code continue to escort us and guide us to protect our health and travel in a civilized way.