Hertz is the unit to calculate the frequency, and it is the refresh frequency of the screen displayed by the computer. It is generally set to 60Hz, but at present, due to the needs of games, there are already 144Hz or even 240Hz display screens; This parameter refers to how many pictures can be displayed on the display screen in one second, and 60Hz refers to displaying 60 pictures in one second. The details are as follows:

　　1. It refers to the refresh frequency of computer screen, which needs to be set according to your monitor parameters, generally set to 60Hz. At present, many e-sports game monitors have supported the refresh rate of 144Hz or even 240Hz.

　　2. Because the dynamic picture of the display screen is displayed by refreshing, it is not easy for human eyes to recognize because of the high refreshing frequency. The refresh rate refers to how many pictures the display screen can display in one second, and 60Hz refers to displaying 60 pictures in one second. The higher the refresh rate, the smoother the dynamic picture display.

　　3. However, the refresh rate needs the support of graphics card and monitor. If you need to choose a refresh rate above 60Hz, you need to ensure that your monitor supports high refresh rate.

　　The Japanese personal computer market, which has been silent for many years, has suddenly caught fire recently.

　　BCN, a professional research company, conducted a survey on POS data of major home appliance stores and online stores in Japan, and found that the computer market has been booming for a long time. In the first week of April, the Japanese PC market showed a year-on-year growth rate of 109.0%, which climbed to 145.1% in the second week and rose to 164.7% again in the third week, showing an amazing growth trend.

　　The reason behind this is that the epidemic continues to spread in Japan. Japanese primary and secondary schools were closed in early March. After the state of emergency was implemented in April, the government repeatedly called on enterprises to expand the proportion of home office workers. In many families, couples and children stayed Stay Home together, working and studying online. To this end, many families urgently acquire computers suitable for office use.

　　As early as 1997, the working form of home office appeared in Japan. In order to enable families raising children to take care of both childcare and work, the Japanese government has been committed to improving diversified work systems such as home office. There is a company called CASTER in Japan, and more than 700 employees implement a thorough home office system. The company has no office space, and employees are scattered all over Japan and never meet each other at all.

　　However, from a global perspective, the proportion of home office in Japan is not too high. A survey of home office in Japan from March 13th to April 13th showed that only 18% of Japanese office workers worked at home during the epidemic. This is the lowest proportion among the 26 respondents of the British survey company. This shows from another angle that the hardware and software of home office in Japan are not mature and have great room for development.

　　This epidemic has made the Japanese home office system work quickly. More and more enterprises begin to work remotely by holding video conferences and other means, and use online business systems instead of business trips. Followed by the rapid growth of telecommuting related software development business, including various attendance management tools, video conferencing tools, business communication tools, task management tools, virtual office tools and so on.

　　Not only that, all kinds of household goods manufacturers also took the opportunity to launch online activities and compete for marketing. The most obvious thing is that the number of food delivery brothers shuttled on the street has increased significantly. Many high-end restaurants have changed to lunch after stopping the in-house food business, and they have set up stalls at the door and distributed them to nearby merchants and households. Didi Japan has also provided food delivery service in Osaka since April.

　　According to an investigation by NKB, an advertising agency, during the epidemic, home-based measures not only promoted food sales, but also significantly increased the sales of kitchen equipment, furniture, sports equipment and books, especially the contrarian growth of the game and video industries.

　　According to the survey of Criteo, an online advertising agency, the sales of sportswear, training clothes, pajamas and other casual clothes have increased significantly in recent weeks. Due to the restriction of going out, the time at home has increased, and consumers will give priority to buying comfortable clothes.

　　The sudden surge of home office has also spawned a large number of home improvement needs, and the home improvement industry has ushered in business opportunities. Since March, Hometech, a home improvement company, has launched the theme of "Workspace" renovation in official website to show customers various renovation schemes and cases. With the development of epidemic situation, the demand for setting up home delivery box without receiving express delivery in person, transforming touch-free home control equipment and updating antibacterial wallpaper has also increased greatly.

　　After the chain fitness club Dongji Sports Oasis Company was forced to close the gym, it increased the online marketing of its own "fitness furniture", and its sales in March doubled from the previous month. The biggest feature of the company’s "fitness furniture" is that it can be used as furniture at ordinary times and become fitness equipment when exercising.

　　With the extension of the state of emergency, home office and other measures tend to be long-term, and consumers stop snapping up after finding that the supply of materials is sufficient, and instead start chasing the fun of home life. According to statistics, the sales of snacks and snacks, as well as dumplings and spring rolls, have all increased significantly in the near future.

　　This epidemic has also promoted the development of online diagnosis and treatment in Japan. The Ministry of Health, Labor and Welfare revised relevant regulations in April, relaxing the restrictions on the scope of patients and diseases applicable to online diagnosis and treatment. (Le Shaoyan)

　　On June 16, local time, US President Trump signed an executive order to adjust the US police practice and qualification standards. The executive order made a statement on the large-scale protests by the American people against police brutality and racial discrimination in the past month, which meant that the government would "conform to public opinion" and make police reform.

　　However, the American media pointed out that the administrative order did not explicitly prohibit some violent law enforcement methods that the people strongly demanded to abolish, and the police system it proposed to improve law enforcement standards was actually "encouragement" rather than restraint. Public opinion believes that the reform of the executive order signed by Trump is weak, and it supports the reform in the open, but it is still a supporter of the police’s tough law enforcement in the dark.

The Washington Post pointed out that the administrative order of police reform signed by Trump is full of formalism.

　　The executive order is to encourage, not to require, the law enforcement of throat lock has not been abolished.

　　Trump told reporters that this executive order will help the police departments in the United States adopt the highest standards to serve their communities. The order stipulates "practice and qualification examination" and "information sharing of police behavior" to avoid employing police officers with bad records and to track down police officers who have committed misconduct in law enforcement.

　　However, the media pointed out that the executive order failed to clearly respond to some key issues, such as the standard and justification of the use of force mentioned in the executive order, but only "encouraged" its implementation; In addition, regarding the law enforcement means of throat lock, the administrative order has not explicitly abolished it, but indicated that it is generally unavailable, but it can be used in the case that "the law allows the use of lethal force".

　　The police surrounded Trump and called him "selfless" and "brave"

　　A number of media pointed out that although the signing of this executive order was caused by African-American Freud’s violent law enforcement by white police, the families of the victims were not invited to attend Trump’s signing ceremony. On the contrary, many military officers and police union personnel were surrounded by Trump. This seems to mean that Trump will never touch these law enforcement officers on which he relies, and how to reconcile the "social problems that deeply split the country" is still far away.

　　In the signing ceremony speech that day, after Trump mentioned the pain experienced by the relatives of the victims, he immediately began to praise the American police for being "brave and selfless" and said that "Americans all know that if there is no police, chaos will occur." The media pointed out that Trump’s signing of this executive order is full of formalism, and he obviously does not want to risk angering law enforcement departments, because these are an important part of his conservative political foundation.

The Washington Post pointed out that Trump "does not want to risk angering law enforcement because it is an important part of his conservative political foundation."

　　Serious problems minimize the police’s mental illness

　　Public opinion generally pointed out that Trump’s executive order made no mention of how to solve the systematic racism problems among law enforcement personnel and comprehensive policy changes. However, these issues are crucial to criminal justice reform. Kendall Thomas, a law professor at Columbia University, believes that Trump did not mention any commitment to serious changes in his executive order, but only focused on police training rather than community safety. Thomas believes that the purpose of Trump’s executive order is only to maintain the status quo, and the moderate reform in accordance with the new provisions of the executive order will only make the police force stronger.

　　Trump has always stressed that police misconduct is a "case" and the number is "very small". Rachel Bako, professor and vice president of criminal law at new york University Law School, believes that this shows that Trump fundamentally refused to admit the existence of the problem in the first place. Bako said that the entire law enforcement system is supportive of those police officers who use violence excessively. Trump has neglected this systematic problem, and the executive order has completely ignored or even mentioned the morbid psychology in the police system and the opposition between the police and the people.

USA-Today pointed out that Trump’s executive order made no mention of how to solve the systematic racism problem among law enforcement personnel and the need for comprehensive reform.

　　The reform of "thin soup and little water" must be intensified by administrative order.

　　On the day Trump signed the executive order, Schumer, the minority leader and Democrat of the Senate, immediately said that Trump’s executive order was "scanty soup and scanty water" and "unable to bring the comprehensive and meaningful changes and accountability required by the American people to American law enforcement agencies."

　　Earlier, the Police Justice Law submitted by the Democratic Party on June 8 called for a major reform of the police system, which explicitly required that police officers be prohibited from using frequently abused methods of law enforcement and arrest, such as lock throat and "no knocking at the door", and at the same time required local police departments to send data on the use of force to the federal government, and made a funding plan to allow state attorneys general to conduct independent procedures to investigate police misconduct or excessive law enforcement. In addition, the proposal will abolish the legal principle called "conditional immunity", and the police can no longer be exempted from civil litigation. These contents are not reflected in the newly signed administrative order.

USA-Today pointed out that there are a large number of people in the United States who can’t stand what the police have done.

　　David Kennedy, a professor of criminology at john jay College of the City University of new york, said that the current executive order is far from enough to make practical changes. Kennedy said: "People think it may be a little helpful, and now it is not enough to provide just a little help." Kennedy said that the emotions and resistance expressed by the American people in the past few weeks are unprecedented, and their attitude towards American law enforcement departments has also changed dramatically, which shows that a large number of people in the United States can no longer stand what the police are doing.