How to realize the so-called virtual reality technology (Figure)

  At the Los Angeles Convention and Exhibition Center, gamers are experiencing virtual reality (VR) devices. Bright pictures/vision china

  With the establishment of virtual reality technology (VR) laboratory in Alibaba, Stormwind TV released the first VR TV, Huawei announced its first generation of VR glasses products, and the VR industry also rose. It can be predicted that in the near future, the wide application of mobile Internet, big data and other information technologies will promote the further development of VR technology. So how is the so-called virtual reality technology realized?

  1. Frontier disciplines of integrated application of software and hardware.

  Virtual reality technology (VR) is a computer simulation system technology to create and experience a virtual world. That is to say, VR uses computers to generate a simulation environment, and uses multi-source information fusion for interactive three-dimensional dynamic visual scene and system simulation of entity behavior to immerse users in this environment. Up to now, there is no universal definition of it in the world, but it can generally be considered that it creates another unreal world that is as real, interactive and immersive as possible for human beings outside the real space by using various human-computer interaction technologies, so that human beings can roam in it, experience the most real virtual space and walk in their dreams without any restrictions.

  VR has been widely used in new media, aerospace, military, engineering and other cutting-edge scientific and technological fields, and will be more widely used in our daily life as an advanced technical means. Because most of the monitors used by virtual reality in human-computer interaction are helmet-mounted enhanced portable display systems, it is one of the most promising application fields of portable display systems. Users only need to wear virtual reality equipment, such as helmets, glasses, etc., and they can feel all kinds of scenes set in the device.

  VR system generally includes user control systems, such as human motion monitoring, control devices such as joystick, keyboard and mouse, and simulation feedback systems and processing systems for human senses such as vision, hearing, touch, smell and taste, as well as information display systems perceived by human beings, such as monitors, stereos and three-dimensional seats. Among them, visual and auditory control and simulation are the main development direction of VR at present, and helmet-mounted enhanced portable display system is the main product form used by users.

  2. Construct a virtual space in advance in the computer.

  VR is an interdisciplinary subject that relies on a large number of computer software technologies such as artificial intelligence, pattern recognition, graphics, bottom interface and new display technology, field sensor technology, force feedback system, wireless and wired communication technology. In essence, VR is the representation of the real world and the realization of dreams; From a technical point of view, it is a comprehensive application of cutting-edge technologies in the fields of software and hardware and an object-oriented comprehensive technology development.

  VR enables people to experience a fantastic virtual reality while wearing a helmet-mounted enhanced portable viewing system. In fact, these virtual reality scenes use complex software technology to construct a real virtual space in the computer in advance. Every point in the space has many dimensions of information such as coordinates, colors, normals, logical relationships and so on in X, Y and Z. The computer then determines the position of people in the virtual scene through user input devices such as sensors, joysticks and mice, and finally reproduces the picture to the user’s eyes through the computer, thus creating a virtual space.

  If such a series of tasks can be connected, and the operation time of the whole system is less than the visual retention time of people, users will have the feeling of roaming in the virtual reality world on the virtual image display screen of the head-mounted enhanced portable display system. VR is to create a virtual environment that makes you feel that this is reality. Entertain and attract you through this fictional reality.

  3.MR— — Break through the boundary between virtual and reality

  In addition to VR technology, there is also augmented reality technology, namely AR. Now there are only more than 20 authoritative companies in the world conducting research. Google’s technology is relatively mature, and its goal is to put the virtual world in the real world and interact with it on the screen. This technology was first put forward in 1990. With the improvement of the computing power of portable electronic products, it is expected that its application will be more and more extensive.

  In essence, AR is the interaction between digital media and the real world. The imaging concept of AR and the immersive imaging experience of VR have created a hybrid virtual reality technology, namely MR, which is based on holographic projection reality. At the Microsoft Developer Summit held in June this year, satyanarayana nadella, CEO of Microsoft, emphasized the importance of its hybrid virtual reality technology equipment — — The correct "opening" way of Hololens is neither a VR helmet nor AR glasses. This hybrid virtual reality device holographically projects computer-generated 3D virtual objects into real space, and the wearer of Hololens can interact with 3D virtual animation in real space and trigger corresponding functions. The imaging principle of this kind of MR equipment is different from that of immersive VR equipment. It projects virtual images into real space, but the imaging effect of the projected holographic 3D images breaks through the boundary between virtual and real world.

  interlinkage

  Research and Application of Virtual Reality Technology

  The focus of NASA’s research on this technology is the real-time simulation of space station manipulation, and they use a lot of cockpit-oriented flight simulation technology. Such as the simulation of the Hubble Space Telescope and the experimental plan of "Virtual Planet Exploration", this project enables the "Virtual Explorer" to use the virtual environment to explore distant planets, and the first goal is Mars.

  The University of North Carolina is the earliest and most famous university to study virtual reality technology. Their main research includes molecular modeling, aviation driving, surgical simulation, architectural simulation and so on. On the display technology, the university has developed a parallel processing system called Pixel Plane, which helps users to build real-time dynamic display in complex scenes.

  MIT was originally a pioneer in studying artificial intelligence, robotics, computer graphics and animation. These technologies are the basis of virtual reality technology. In 1985, a media laboratory was established to conduct formal research on virtual environment.

  The laboratory of man-machine interface technology in Washington Technology Center of the University of Washington plays a leading role in the research of new concepts, and is also conducting research on sensory, perceptual, cognitive and motor control abilities. They introduced the research of virtual reality technology into the fields of education, design, entertainment and manufacturing. For example, Boeing’s V22 transport plane was built in the laboratory before it was put into production.

  Illinois State University has developed a distributed virtual reality technology system that supports remote collaboration in vehicle design. Engineers from different countries and regions can design in real time through computer networks. In the process of designing a vehicle, various components can share a virtual environment, and can view the video transmission and corresponding positioning direction of any position of the other party. Virtual prototype is adopted in the system, which reduces the time for designing images and new products to enter the market, so that products can be estimated and tested before production, and the quality of products is greatly improved.

  George Mei Sen University has developed a real-time fluid simulation system in a dynamic virtual environment. In a distributed interactive simulation system, the physical characteristics of complex fluids in the real world are simulated, including simulating ships running across the water, stirring liquids, mixing liquids of different colors, and the influence of rain on the terrain.

  (Wei Yuejiang)

All localities have continuously optimized vaccination services and accelerated vaccination against influenza.

CCTV News:In recent days, cold waves have hit many places. The National Health and Wellness Commission said that the number of visits to respiratory diseases in China has been relatively stable in recent days, but with the cold wave coming and the temperature dropping, the number of visits to respiratory diseases such as influenza and COVID-19 still fluctuates. The National Health and Wellness Commission and the National Bureau of Disease Control and Prevention require that vaccination services be continuously optimized and vaccination be continued. Guide all localities to take time-sharing vaccination, extend the vaccination cycle, increase service hours and other convenient services to promote influenza, COVID-19 and other vaccination work.

Tianjin continues to organize vaccination units to increase the frequency of outpatient vaccination on Saturday and Sunday to ensure vaccination sites and personnel. At present, 216 routine clinics in the city have opened weekend clinic days, accounting for about 76% of the total number of routine clinics. At the same time, strengthen the level of intelligent service, and comprehensively promote the use of online appointment vaccination convenience service functions.

Zhao Yongan, Director of Nanyingmen Street Community Health Service Center, Heping District, Tianjin:According to the number of online appointments and the demand of people for on-site consultation, the center fully extended the outpatient time of vaccination in the center. For those who can’t get vaccinated in time or the working hours can’t be arranged, the weekend extension service has also been carried out.

Dezhou City, Shandong Province, conducts real-time monitoring of influenza and other vaccine stocks, and purchases them in time when insufficient information is found. The disease control department released the address, contact number and service hours of vaccination clinics in the jurisdiction to facilitate the people to vaccinate nearby.

Yang Yang, Chief of Immune Prevention Department, Decheng District CDC, Dezhou City, Shandong Province:There are about 5,000 influenza stocks in the whole region. Recently, the stocks have been replenished in time, and 3,000 have been purchased, which can ensure the vaccination demand of residents in the area.

Zhang Jinlan, a resident of Decheng District, Dezhou City, Shandong Province:I didn’t have time to bring my children for injections at work before, because I was busy at work, and now there is a delay at noon, which is very convenient for us to bring our children for injections.

Recently, the National Bureau of Disease Control and Prevention has continued to guide all localities to evaluate the vaccination demand of influenza and other vaccines, and strengthen the connection between supply and demand with relevant departments to ensure that the supply of influenza and other vaccines is continuous and the people have seedlings to vaccinate. In the inoculation point of Yuanma Town, Yuanmou County, Yunnan Province, the daily inoculation amount has increased recently.

Zhang Ruming, a resident of Yuanma Town, Yuanmou County, Yunnan Province:I’m relieved to get the flu shot, so I don’t have to go to the hospital. I got the flu shot last month, and I came to pneumonia vaccine again today.

He Jinxiu, a resident of Yuanma Town, Yuanmou County, Yunnan Province:They are all played according to the notice of the rural doctor. Children can rest assured that they can play with adults and improve their immunity.

The medical staff reminded everyone that before vaccination, the recipient or guardian should truthfully and fully inform the doctor of his past history and physical health to ensure that his body is in a healthy state, and he can only be vaccinated without relevant vaccination contraindications. After vaccination, if there are serious symptoms, you should report to the vaccination unit in time and go to the hospital if necessary.

Yang Wanqun, Director of Yuanmou County CDC, Yunnan Province:Everyone is the first responsible person for their own health. Therefore, we appeal to the masses to be diligent in ventilation, take more exercise, wear masks in public places, and seek medical advice in time if they have symptoms of cough and fever. At the same time, actively vaccinate.

Focus on key institutions and people to prevent aggregation risks

Schools, nurseries and nursing homes are the key institutions to prevent respiratory diseases, and the elderly and children are the susceptible groups of respiratory diseases. The National Health and Wellness Commission requires primary and secondary schools, kindergartens, nursing homes, social welfare homes and other key places and crowded places to implement measures such as ventilation and disinfection, strengthen health science popularization and health monitoring, and reduce the risk of infection.

Jiangxi, Yunnan, Shaanxi and other places continue to promote the knowledge of disease prevention to teachers and students by carrying out popular science of respiratory diseases into campuses and theme classes, and enhance their awareness of prevention.

Kindergartens, primary and secondary schools all over the country have strengthened the morning check-up and absenteeism registration. When students are found to have symptoms such as fever and cough, they should wear masks for students in time and contact their parents. Education departments and civil affairs departments in Shandong, Henan and other places have strengthened the disinfection of key places such as schools and old-age care institutions, strictly managed the entry and exit of external personnel, and reduced the risk of infection among the elderly and children.

Tang Zhihong, member of the Party Group of Decheng District Education and Sports Bureau, Dezhou City, Shandong Province:At the same time, we will take the initiative to discuss with the health and disease control departments, strengthen information exchange, and jointly carry out risk judgment, prediction and early warning to guide schools to respond scientifically and accurately. We will further urge schools to find out the risk points and loopholes in prevention and control work, ensure that all prevention and control measures are implemented in detail, and protect the health and safety of teachers and students to the greatest extent.

Tianjin requires all schools to establish a high-quality homework design mechanism, and carry out differentiated teaching design according to students’ physical conditions. If students miss more classes due to illness, the teaching progress will be moderately slowed down.

The Ministry of Civil Affairs has made relevant arrangements for the prevention and control of respiratory diseases in old-age care institutions, requiring all localities to keep the green channel for medical treatment in old-age care institutions open, and staff should wear masks when serving, carry out health monitoring every day, and do not take up their posts without illness. Observe the health status of foreign workers such as visitors and couriers. A number of hospitals and institutions for the aged in Xiamen, Fujian Province have strengthened cooperation, and medical staff have carried out professional training on the prevention and treatment of respiratory diseases for aged care workers and medical staff, and managed medical services and aged care services in different regions to prevent cross-infection.

Experts give four suggestions on how to protect the elderly.

In the high incidence season of respiratory diseases, how should the elderly protect themselves and try to avoid infection? Experts from China CDC gave four protection suggestions.

The elderly should improve their physical fitness, exercise properly, improve heart and lung function, and at the same time, have a balanced diet, keep enough sleep and improve their immunity.

Develop good habits, such as washing hands frequently, wearing masks scientifically, keeping social distance, etc., to reduce the chance of infection.

Eat more high-quality foods with high protein content and high vitamin content. These foods can not only supplement the energy needed by the human body, but also improve the body’s immunity and resist the invasion of pathogens.

It is recommended to be vaccinated with influenza vaccine, Covid-19 vaccine and pneumococcal vaccine.

The relevant person in charge of the National Bureau of Disease Control and Prevention reminded the public that in addition to influenza vaccine this winter and next spring, pneumococcal vaccine and Covid-19 vaccine are also recommended for the elderly and people with chronic basic diseases. For children, it is suggested that on the basis of continuing to do a good job in immunization planning vaccination, non-immunization planning vaccines such as pneumococcal vaccine and Haemophilus influenzae type B conjugate vaccine can also be vaccinated.

If you have had flu-like symptoms, it is still recommended to continue the flu vaccination after you have not been diagnosed and recovered on your own.

2024 Henan Government Affairs WeChat Influence Monthly List No.4 (1st batch)

  Dahe Net News On May 16, 2024, the first batch of the fourth issue of the monthly list of Henan government affairs WeChat influence was officially released.

  In this issue, a total of 19 government affairs lists were released, and one scenic spot list was released in two batches. The first batch of lists includes provincial categories, provincial cities, counties and cities, education, cultural tourism, health care, medical insurance, market supervision, big data and scenic spots.

  The first list (provincial category): the number one scholar is "Henan Communist Youth League"

  The articles with higher comprehensive ranking in this list and their WeChat WeChat official account are as follows:

  Youth learning: Youth plays an important role in Chinese modernization (rural revitalization) (Henan Communist Youth League)

  Announcement of College Entrance Examination Time in Henan Province in 2024 (Henan Provincial Department of Education)

  April tax declaration reminder! (Henan taxation)

  Sun Jinlong, Party Secretary of the Ministry of Ecology and Environment, went to Henan to investigate the prevention and control of air pollution (Henan environment)

  A high-rise building in Zhengzhou caught fire and evacuated 20 people! (Henan Fire Fighting)

  The ranking of WeChat WeChat official account in this list is: Henan Communist Youth League, Zhongyuan Shield, Henan Provincial Department of Education, Henan Disease Control, Henan Taxation, Healthy Henan, Henan Fire Protection, Henan Provincial Department of Culture and Tourism, Yufa Sunshine, Henan Development and Reform Commission, Henan Procuratorate, Henan Armed Police, Henan Federation of Trade Unions, Henan Emergency Management Department, Henan Environment, Henan Talent Market, Henan Medical Security Bureau, Henan Social Security Card, Henan Meteorology and Henan Association for Science and Technology.

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