Tesla raised $2 billion, and Musk said the company’s market value will increase tenfold.

  On May 2, local time, Tesla announced that it would refinance US$ 2 billion, including the newly issued US$ 650 million common shares (about 2.7 million shares) and US$ 1.35 billion convertible bonds, to maintain the overall operation of the company.

  Financing is like "tearing off a band-aid"

  Tesla CEO Musk said at the investor conference that although Tesla currently has enough cash flow to support its business development, having more cash will help Tesla to buffer in order to cope with the unexpected macroeconomic situation and the potential demand headwinds in the automobile market.

  Musk was finally willing to "plan ahead" to face the reality, and also let investors worried about Tesla’s tight cash flow breathe a sigh of relief. Dan Ives, managing director of the asset research department of Wedbush Securities, a wall street brokerage, believes that Tesla’s financing decision is like "tearing off a band-aid". He said: "Tesla is finally willing to listen to investors. Before, the market was worried that Tesla might not have enough cash to support it through the second quarter. The data can tell everything."

  In this round of financing, Musk said that he would buy Tesla shares worth $10 million (about 41,896 shares). According to InsiderScore, Musk’s move to buy back shares implies that the market can buy Tesla shares in the short term. In the three months after Musk’s five purchases, Tesla’s share price rose by more than 40% on average.

  In addition, the new documents show that Musk personally owes more than $500 million in loans to investment banks. According to Tesla’s latest submission, Musk personally owed $213 million, $209 million and $85 million to Wall Street investment banks Goldman Sachs, Morgan Stanley and Bank of America, respectively, but this was $117 million less than that of the same period last year. Last year, Musk personally owed $624 million to investment banks.

  Musk holds about 20% of Tesla’s shares, with a total value of 8 billion to 12.6 billion US dollars. Tesla warned that if the stock price continues to fall and the bank forces Musk to sell some of its shares, it may in turn put new pressure on the stock price.

  It is worth noting that the primary participants in Tesla’s new financing plan, including Goldman Sachs and Citigroup, have all given Tesla shares a "sell" rating, which is relatively rare on Wall Street.

  The market value should reach 500 billion dollars.

  After Tesla announced a $2 billion financing plan, its share price rose by 4%. However, this year, Tesla’s share price has fallen by nearly 30%, with a market value of $42 billion. Musk also told investors recently that autonomous driving will make Tesla a company with a market value of more than 500 billion US dollars.

  This means that Tesla’s market value will be more than 10 times on the current basis. According to Musk, Tesla will become a "value-preserved" model. He expects that the value of each Tesla will be between 150,000 and 250,000 US dollars in three years, thanks to the upgrade of Tesla’s autopilot software. He also predicted that there will be 1 million autonomous Robotaxis on the road next year.

  However, Musk’s confidence has also been doubted by analysts. For example, Jeffrey Osborne, an analyst at Cowen, a Wall Street investment bank, wrote in a letter to investors: "We believe that the transformation of Tesla’s technology and execution strategy will face great risks. If Tesla wants to compete with NVIDIA in hardware, Google Waymo in software, and the shared taxi platform that is dominant in the current market in the operation of self-driving taxis, it is very difficult to achieve."

  Osborne also pointed out that Tesla did not fully plan how to operate self-driving taxis, because some basic questions have not been answered, such as pricing, insurance liability and legal supervision. Musk said after the earnings conference last month that Tesla is considering launching its own insurance financial products.

  Zach Kirkhron, Tesla’s newly appointed CFO, maintained his expectations for the company’s prospects at the investor conference, that is, 90,000 to 100,000 Tesla vehicles were delivered in the second quarter and 360,000 to 400,000 Tesla vehicles were delivered throughout the year.

  Qian Tongxin

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Do you know Google trends? If you are doing overseas business, you should have heard about it. Google Trends can help you analyze your competitors, understand the hot news of various countries and analyze market segments.

Google is the largest search engine in the world, and there are more than billions of information and data searched by Google every day. Google Trend is its product. Through Google Trend, you can get related keyword popularity and trends from all over the world and so on. Here are some usages of Google Trend, so you can learn it quickly if you are in an overseas market.

1. View the latest hot search

When you open the Google Trends website, you can see that there is a popular section in the upper left corner, which is the hottest topic in every country at the moment, arranged from top to bottom according to the highest heat.

Different countries have different topics. You can choose the corresponding countries according to the market you have made to check the hot topics. Combining hot topics can help you understand what users are concerned about now, and then combine them to provide ideas for your social media update.

Generally speaking, this section is more suitable for those blog forums or technology websites that output articles, because writing articles must keep up with current events. Of course, if you are a seller, you can also pay attention to whether there are popular products through popular search. For example, if there is a hot topic in cycling season, and you sell bicycles, then you can consider whether to increase the promotion.

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

Step 2 analyze competitors

Google Trends can search for keywords, such as brand name or product model, and customize the time range to view its hot trends. You can check the trend of competitors’ popularity by entering their brand names or competing products. If the popularity of your competitors suddenly soars or continues to surpass yours in a certain period of time, then you should analyze what happened during that period, whether your competitors made strategic adjustments, etc., and how you can make your own adjustments to this point.

Take Xiaomi SU7 as an example. On March 34, 2024, Xiaomi SU7 held a press conference and was officially delivered on April 3. We input Xiaomi SU7 into Google Trend, and we can see that its popularity has a rapid growth trend from March 17th to April 6th, 2024.

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

The reason for this obvious peak must be the release, listing and delivery of the new car. At that time, Xiaomi SU7 really caused a very heated discussion, and the search for SU7 on the Internet also increased significantly. Similarly, if you want to search for other competing products, you can also search in this way.

In addition to directly searching for competitors’ keywords, you can also enter your own brand or product for comparison at the same time. Google Trends will simultaneously give a comparison chart of the heat of two competing products, which can visually see how the competition between them is in each time period, and also help sellers to analyze whether there are problems in their marketing strategies.

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

3. Judge whether it is a seasonal product.

Some products with special properties are seasonal products, such as Mother’s Day gifts, Christmas gifts, hand warmers, etc., which cannot be "resident" products because of their unique attributes. We can also judge these products by using Google Trends.

For example, when searching for Christmas gifts, we can see that there is an obvious peak in the trend from mid-December to Christmas Eve, and the search volume in the rest of the time is almost zero, which is a very obvious seasonal trend.

There are also some products whose seasonality is not particularly obvious that we need to search and judge through Google Trends, such as sunglasses. Most people will think that sunglasses are more needed in summer when the sun is strong, but in fact, through search, we can see that sunglasses have peaked in most time periods of the year, which is convenient for sunglasses sellers to find the right time and increase their promotion efforts.

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

4. Analyze market segments

By analyzing market segments, it helps sellers to find the target market more accurately and launch marketing planning for the target market. I can give an example of Google trends with laptop as the key word.

Search for laptop in the past 90 days in the United States, and the top five in terms of search popularity are New York, Washington, Virginia, Columbia, and Texas.

Through the inquiry of each region, we can see that New York State mentions Lenovo brand more, and Virginia mentions HP more. This will help merchants to make targeted marketing strategies according to the degree of brand preference of each state, and the user market will be more accurate, which is very beneficial to sales.

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

5. Find accurate keywords

Like e-commerce platforms such as Amazon, the keywords of products are very important for your ranking in search engines, and only when you use the right keywords can you get ahead.

There are many paid keyword research tools on the Internet, but we can use Google Trends, a free tool, to query keywords, so as to determine what keywords are more accurate.

Let’s take laptop as an example. When we search laptop and laptop computer at the same time, we can see that the interest index of laptop is much higher than laptop computer, which shows that the word laptop is more accurate.

Teach you several usages of Google trends, and learn them as soon as you are in an overseas market.

Image source: trends.google.com

In addition, by looking at the related query section below, we can see the hot topics related to the searched keywords, such as "shop luggage" and "snapdragon x elite laptop", which will help businesses find some potential customer needs.

6. Optimize Google shopping strategy

Google Shopping Advertising is also a very important promotion strategy for businesses that make sea brands. In addition to the functions mentioned above, Google Trend can also search Google Shopping Data, just switch.

We use glove as the key word to search, and we can see that in the past five years, the sales volume of glove has obviously increased in June every year, and then it has shown a downward trend. For merchants, according to the data given by Google Trends, they can make preparations in advance when the peak season is coming, so as not to be in a hurry to catch up with the progress during the activity period.

These are the six usages of Google trends to be introduced today, and those that have not been introduced are welcome to discuss in the comments section.

(Source: Argo said cross-border)

The above content belongs to the author’s personal opinion and does not represent Hugo’s cross-border position! This article is reproduced with the authorization of the original author, and it needs the authorization and consent of the original author. ?

Spring Festival travel rush hits | Every footprint on the snow is heading home.

It is in Spring Festival travel rush, but many parts of the country have been hit by the strongest freezing rain and snow since 2009.

On February 5th, the 11th day of Spring Festival travel rush in 2024, the Central Meteorological Observatory continued to issue a frozen yellow warning. Large-scale rain, snow and freezing weather led to the closure of some expressways, the late suspension of high-speed trains and the large-scale delay of airports.

Many people’s way home has therefore become extremely tortuous and difficult. Some people were forced to stay on the expressway for a day and a night, and some people were delayed to start because of the suspension of trains and high-speed trains, but this could not stop the pace of going home.

On February 2, Huai ‘an, Jiangsu Province, in the section of Huai ‘an Canal Bridge in Huai ‘an City, Jiangsu Province, the road was temporarily congested due to heavy snow, and vehicles were slowly waiting to pass.

On February 4, 2024, in Shanghai, passenger trains on some high-speed rail lines were delayed to varying degrees, and the waiting room of Hongqiao Railway Station was crowded with people.

On February 4th, Wuhan, a Harmony train passed by the Yellow Crane Tower. Freezing rain and snow caused the pantograph of the train to "pull the arc", and sparks and lightning appeared at the top of the train.

In the ice and snow, people are still moving forward. Just because every footprint on the snow faces home, even if the road is rugged, it is still full of expectations for happiness and reunion.

On February 4th, Jinan, Shandong Province, a large-scale snowfall was ushered in on the day of beginning of spring in the lunar calendar, and white snow flowers were flying all over the sky in the night. At 20 o’clock, in the East Square of Jinan West Railway Station, the ground was covered with white snow, and passengers coming and going at the railway station left a string of footprints in the snow.

At noon on February 2, the passengers who got off at Luohe Railway Station in Luohe City, Henan Province braved the heavy snow and left the station.

On February 3, Zhengzhou Railway Station, people carried big bags and small bags on their backs, dragging their children to take their women home in the snow.

On February 4, Huaibei, Anhui, passengers left the station at Huaibei Railway Station.

On February 4th, the 10th day of Spring Festival travel rush, heavy snow greeted Wuhan. At Hankou Railway Station in Wuhan, people carry large and small pieces of luggage on their shoulders, some drag their children with them, and braved the snow and the cold to set foot on their way home.

On February 4, Huaibei, Anhui, passengers left the station at Huaibei Railway Station.

On February 3, Zhengzhou Railway Station, the little girl dragged her suitcase behind her parents, ready to go home by bus.

At noon on February 2, the passengers who got off at Luohe Railway Station in Luohe City, Henan Province braved the heavy snow and left the station with heavy luggage.

At noon on February 2, Luohe Railway Station in Luohe City, Henan Province, the rain and snow slipped, and the passengers who just got off the bus accidentally fell.

On February 3, Zhengzhou Railway Station, a woman took a car with her child on her back.

On February 4, Jinan ushered in a large-scale snowfall. In the East Square of Jinan West Railway Station, passengers coming and going from the railway station left a string of footprints in the snow.

On February 1 ST, Fuyang Station, Anhui Province, the returning Chinese New Year passengers walked past the snowy station square.

At 3 o’clock in the morning of February 3, a bus bound for Zhumadian was boarding at the North Square of Xinyang Railway Station in Henan Province, and the front of the bus was covered with icicles.

At 3 o’clock in the morning on February 3, a passenger dragged his luggage to the entrance of Xinyang Railway Station in the North Square of Henan Province.

On February 2, a child reached out and caught the snowflake in the crowd at Luohe Railway Station, Luohe City, Henan Province, and was very happy.

On February 4th, in Huai ‘an East Station, Jiangsu Province, it was snowy and snowy, and passengers carrying big bags and small bags were ready to embark on a journey.

On February 2 nd, in the snowstorm, passengers carrying big bags and small bags walked out of Zhengzhou East Station.

* The picture in this article is vision china

Revealing the history of Taiwan, China’s "Pinyin War" Why are the Pinyin on both sides of the strait different?

 

2

illustration

There seems to be no connection between the first two news items and the last one, but if you have heard the ins and outs of Taiwan Province’s Pinyin War, you may have some new knowledge about the origin between Taiwan Province and Chinese Pinyin.

Anyone who has been to Taiwan Province, or is familiar with Taiwan Province, knows that there are many pinyin systems in Taiwan Province, which are different from those in mainland China. The function of phonetic notation for Chinese characters is undertaken by phonetic symbols (that is, the system that looks a bit like Japanese katakana). The romanization of Chinese characters, Chinese Pinyin and Universal Pinyin are competing for who will undertake the function of Latin Chinese characters (that is, spelling Chinese characters with Latin letters). In particular, the contest between the latter two went beyond the linguistic category and rose to a political struggle, which caused widespread concern and heated discussion, so it was called "Pinyin War".

We are all familiar with Chinese Pinyin, so I won’t say much here. The Romance of Mandarin comes from the French Pinyin of Romance of Mandarin (commonly known as "Lao Guo Luo") formulated by the Preparatory Meeting for the Unification of Mandarin in 1926, and the compilers brought together many famous linguists such as Qian Xuantong, li jinxi, Zhao Yuanren and Lin Yutang. In 1928, Nanjing Kuomintang Government College published it as "Mandarin Phonetic Alphabet II", which was implemented simultaneously with phonetic alphabet. In 1986, Taiwan Province released the Second Form of Phonetic Symbols in Mandarin, commonly known as "New Country Luo". The universal pinyin scheme was first put forward in 1997 and was first used in Taipei City where Chen Shui-bian was the mayor in 1998. In 2002, the Ministry of Education of Taiwan Province adopted the "Chinese Pinyin System as Universal Pinyin", and replaced Chinese Pinyin with Universal Pinyin.

To tell the truth, Mandarin Roman and Universal Pinyin look similar to Chinese Pinyin, both of which use Latin letters, but there are differences in handling some problems, such as which letter to use to express some pronunciations, whether to add additional symbols, how to express Chinese tones, etc. For example, there is a Mucha area in Taipei, which is spelled "Muzha" in Chinese pinyin, "Mucha" in Roman characters and "Mujha" in common pinyin. Generally speaking, all countries or regions want to promote a standard spelling scheme, but different spellings often coexist in Taiwan Province for a long time.

The coexistence of various spelling schemes of Chinese characters is actually the result of political wrestling in Taiwan Province. Before the Chinese Pinyin Scheme was launched in mainland China in 1958, there were always many Latin schemes for Chinese characters in the Chinese character circle. However, after 1958, the spelling in mainland China was unified as Chinese Pinyin, while Taiwan Province, on the other side of the Taiwan Strait, still insisted on using Roman characters, the national language.

Even in Chinese Pinyin, which has been adopted by the United Nations Secretariat since 1979, it is used to transliterate the names and places of China in various Latin alphabets; Even though the International Organization for Standardization (ISO) stipulated in 1982 that Chinese Pinyin should be the international standard (ISO7098), Taiwan Province still used Roman characters to spell Chinese characters, and even released a set of "New Country Luo" which few people used. The competition between Roman characters in Mandarin and Chinese Pinyin may be regarded as a prelude to the Pinyin War.

About because Chinese Pinyin has gained more and more international recognition, due to the need of exchange of scientific, technological, cultural and academic materials, and in order to be in line with the world, in 1999, the administrative department of Taiwan Province authorities decided to adopt the Chinese Pinyin method in mainland China, and it was planned to make Chinese Pinyin a compulsory course for primary school students two years later.

If the story ends here, then the "Pinyin War" is also strangled in the cradle. It happened that in 2000, Chen Shui-bian came to power, implemented the "Taiwan independence" policy, and constantly "localized" and "de-China" in culture. In this context, the universal pinyin, which claims to be more suitable for spelling "Taiwanese Mandarin", has replaced the Chinese pinyin.

Such a move was fiercely criticized and resisted by all sides of the island, and the "Pinyin War" broke out. The main argument of the opponents in the debate is that the universal pinyin is not universal at all, and even it is difficult to pass in Taiwan Province, let alone meet the international standards. Although the official said that universal pinyin would not be enforced, counties and cities that can adopt "universal pinyin" can apply for huge subsidies, while those that adopt Chinese pinyin have no preferential policies. Despite this, some counties and cities do not buy it. For example, Taipei City, which once took the lead in universal Pinyin, insisted on using Chinese Pinyin.

Although the degree of cooperation among all parts of the island is not high, and the backlash from all walks of life has never been cut off, Taiwan Province officials have never given up their efforts to make universal pinyin "unify the world", and even prepared to make all place names adopt universal pinyin by the end of 2007. However, the situation suddenly changed in 2008, when Ma Ying-jeou became the leader of Taiwan Province region. On September 16th, the Ministry of Education of Taiwan Province decided to completely abandon the common pinyin and switch to the Chinese pinyin which is common with the mainland. The "Pinyin War" that lasted for many years finally came to an end.

Of course, although the war is over, there are still many battlefields to be cleaned. For example, in the past six years, the promotion of universal pinyin has left a lot of signboards, and it is naturally a large expenditure to replace them all. Therefore, it is inevitable that the two schemes will coexist for a long time.

Whether to use Chinese Pinyin or Universal Pinyin is originally just a linguistic question. It is not difficult to get an answer by comparing which scheme is more systematic, which scheme can accurately record and reflect Chinese pronunciation, which scheme is easier to teach and which scheme is more in line with international standards. In fact, Chinese pinyin and universal pinyin are roughly the same, with only a few differences. Linguists and users have their own judgment on which of the two schemes is better or worse. However, when Universal Pinyin was implemented, the two parties, the state and the pro-China, also criticized the Democratic Progressive Party authorities for "politics trumps professionalism and ideology overturns practicality". It is no wonder that when the relevant authorities in Taiwan Province decided to change the Chinese transliteration policy from "Universal Pinyin" to "Chinese Pinyin", the People’s Daily at that time was accompanied by an eight-word commentary: "A pragmatic move". (Wuyun)

 

Source: Beijing Evening News-North Night New Vision Network

Promoting social governance and urban organic renewal with the transformation of old residential areas

From the perspective of economic, social and urban development, one of the important backgrounds of the transformation of old urban communities is that China’s urbanization has entered the second half. In 2019, China’s urbanization rate has reached 60.60%, and the per capita GDP has exceeded 10,000 US dollars, which is higher than the average level of upper-middle-income countries. The process of urbanization in China has entered between the second turning point (urbanization rate is 50%) and the third turning point (urbanization rate is 70%), and the urban development has shifted from incremental expansion to the era of upgrading stocks. Urban governance needs to pay special attention to people’s livelihood issues and promote urban transformation and development.

The city is a living body, and urban renewal is an eternal topic. The renovation of old residential areas embodies the development idea of "making people more convenient, more comfortable and better in urban life". As early as the central city work conference held in 2015, the central government has proposed to speed up the transformation of old communities. The the Political Bureau of the Communist Party of China (CPC) Central Committee Conference held in July 2019 proposed to implement short-board projects such as the renovation of old urban communities, urban parking lots and the construction of urban and rural cold chain logistics facilities. The renovation of old residential areas has been accelerated.

According to the deployment, in 2020, the country plans to renovate 39,000 old urban communities, involving nearly 7 million residents, double the number in 2019, with the focus on residential areas completed before the end of 2000. This work has also become a new starting point for "stable investment" in urban and rural construction after the investment in shantytown renovation. The renovation of old residential areas can not only promote the organic renewal of the city, improve and upgrade the living environment of residents, but also create new investment and jobs, which is also of great significance to the current work of "six stabilities" and the implementation of "six guarantees".

At present, the year 2000 is generally used as the node to divide old communities and new communities. The residential quarters built before the end of 2000 generally have the demographic characteristics of "prominent aging phenomenon", the location characteristics of "adjacent to the old city center", the architectural entity characteristics of "five or six floors without elevators" and the social governance characteristics of "lack of property management". Therefore, there are housing safety problems, infrastructure problems, supporting services problems and community management problems in old residential areas that need to be solved.

Old residential areas have universal characteristics, and the reconstruction work needs to start with these universal characteristics and summarize the possible problems. The author believes that there are six main problems in the renovation of old residential areas: first, in community governance, residents’ cognition and demands for the renovation and upgrading of residential areas are different and difficult to coordinate; Second, in terms of updating hardware facilities, community supporting facilities are old, some facilities are lacking in functions, and some facilities even have hidden dangers; Third, the construction of public service facilities, land shortage and difficult to supplement; Fourth, in terms of standards and norms, relevant norms need to be further established and improved; Fifth, in the aspect of fund-raising, it is necessary to establish a fund mechanism that is reasonably shared by multiple subjects; Sixth, in terms of institutional mechanisms, relevant approvals need to strengthen coordination and cooperation.

The renovation of old residential areas needs system design, and the goal of "five modernizations" is clear: First, it is suitable for aging, including barrier-free design and installation of elevators; Second, greening, energy saving and consumption reduction, and integration with urban green development; Third, communization, promoting the leadership of party building and residents’ autonomy, and developing smart communities in governance; Fourth, the circle of life, including "15-minute life circle", "10-minute old people circle" and "5-minute children circle" and the construction of public charging piles and public laundry rooms; The fifth is human culture, which combines the transformation of old residential areas with the protection of local characteristics and the continuation of urban cultural context to promote urban organic renewal.

The renovation of old residential areas needs comprehensive planning, and the renovation objects and tasks can be classified. The renovation of old residential areas includes the following aspects: first, the renovation of single buildings to make them more solid and beautiful; The second is the transformation of residential environment, which makes residents’ life more quality; Third, all kinds of facilities are perfect, making residents’ lives more convenient; Fourth, the community management is perfect, which makes the community life more orderly.

According to this, the task of old residential area renovation can be divided into three categories: first, the basic category to meet the needs of safety and basic life, including municipal supporting infrastructure such as water, electricity and heating roads, and maintenance of public parts of buildings; The second is the improvement of life and convenience, including the improvement of residential environment and supporting facilities, the installation of elevators and the increase of parking facilities in conditional residential areas; The third is to improve the quality, which can be provided by the market, including the supply of community public service products, such as pension, nursery, health, etc. The provision of such public services must be based on the principle of adapting to local conditions and seeking truth from facts, and strive to provide residents with "menu-style" optional services.

The transformation of old residential areas needs the participation of social capital and the promotion of multi-subject and multi-source power. The executive meeting of the State Council held on April 14th this year proposed to establish a mechanism for the government, residents and social forces to share the reconstruction funds reasonably, with subsidies from the central government and special debts from local governments to encourage social capital to participate in the reconstruction operation. The transformation of old residential areas needs to solve the problem of "where does the funds come from", and it is necessary to establish a framework system of normalized maintenance and renewal funds.

Social governance must be innovated in the renovation of old residential areas. The transformation of old residential areas is an eternal theme in the process of urban development. Its core concept is to implement the people-centered development idea, the development concept of "innovation, coordination, green, openness and sharing" and the transformation principle of "seeking truth from facts and adapting to local conditions". As a livelihood project, the renovation of old residential areas must encourage the public to actively participate, listen to the opinions of all sectors of society in time, and form a good working atmosphere. Efforts should be made to solve the outstanding problems strongly reflected by the masses, so that the masses can have more sense of gain in the transformation of old residential areas. This process is bound to be a social governance process of mutual consultation, co-construction, co-governance and sharing.

(The author is a professor-level senior urban planner, former vice president of China Urban Planning and Design Institute and deputy secretary of the Party Committee)

Never die! 165,000 frames repaired, every frame is precious!

  Two days ago, Observer Jun attended a special movie premiere.

  It is special because this film is not a new film in the traditional sense.

  It is an old classic that has been reborn with the help of new technology — —

  The first black-and-white 4K restoration feature film "Never Gone Radio Wave" jointly produced by CCTV Video and China Film Archive.

Film premiere scene

Film premiere scene

  At the premiere ceremony, a promotional film with restoration effect was played on the big screen, and the black-and-white picture changed from blurred black and white to clear color.

  After watching it, Observer Jun suddenly understood why Tian Hua, a 93-year-old performance artist, was so excited at the opening ceremony of the Beijing International Film Festival:

  "Too fresh! It’s so vivid ‘ Color ’ Teacher Sun Daolin is so handsome! This kind of shock can only be completely felt on the big screen. "

  Knowing that the restored film will be released on October 6, I observed that Jun did one thing immediately after the premiere — — Find the small partners of the project repair team and "force" them to "confess". How did you repair the film so vividly?

  How did you do it? Did you really use magic? Don’t worry, and listen to the observation gentleman to tell you in detail!

Repair the coloring process

Repair the coloring process

  4K power:

  Repairing as old can rejuvenate you.

  "Never Gone Radio Wave" was filmed in 1958. At that time, film was the original carrier of movies. Sixty-three years have passed, and after years of precipitation, this film has also left traces of time — —

  Because of the age, there are many problems on the film, such as dust, dirt, mildew, fading, image jitter, scratches, flicker, noise, discoloration, blurring and so on. Therefore, it is necessary to adopt digital film restoration and processing technology to deal with them, so as to obtain higher image quality.

Damaged film specimen

Damaged film specimen

  The intention of restoration, on the one hand, is to "repair the old as the old". With the help of digital restoration technology, the lost image on the old film can be restored to the original "taste" of the film as much as possible.

  On the other hand, it is to make old films "rejuvenate" and be able to enter the cinema again. The resolution of the original film is 5460*4250, but with the erosion of time, the quality of the film base will react chemically. Under the existing technical conditions, the resolution of 4K is an ideal state for film restoration.

  Before 2017, the digital restoration of old movies in China mostly followed the 2K standard. The 4K resolution is based on the 2K resolution, which fully increases the picture information by 4 times.

  Therefore, before the repair, each frame of the picture must be magnified by the repairman four times before the damage can be seen clearly.

The repairman checks the film.

The repairman checks the film.

  For the more serious and complicated damage, it is even necessary to extract some materials, and after careful observation and analysis in the appraisal theater, further decide how to repair it and what software to use.

  For some special damaged pictures, the repairman must transfer the single frame of the picture to the later special effects software, and use the special effects function to realize 4K repair, restore the original flavor of the film, and restore the new life if it is old.

  Triple repair:

  What is the experience of clicking the mouse 20 thousand times a day?

  The restoration of classic movies is generally divided into three stages: physical restoration, digital restoration and artistic restoration. The first two can be classified as technical repair.

  The so-called physical restoration, the main task is to remove impurities from the picture, restore the visual texture of the picture at the beginning of production, and bring more comfortable and clearer visual experience to the audience.

  Friends can refer to the movie One Second, where the projectionist played by Fan Wei washes and repairs the film by hand.

Film One Second hand-washed film screen

Film One Second hand-washed film screen

  The original wrinkled film can be clearly shown again after proper scrubbing and drying. However, in the film, the copy volume was repaired, and this time, "Never Gone Radio Wave" repaired the original film background.

  Digital restoration is to digitize the film, which is the largest stage of the whole restoration process. As mentioned in the previous part, after the film is digitally scanned, 4K digital restoration technology is used to deal with various problems such as mildew, fading, image jitter, scratches, flicker, noise, discoloration and blur frame by frame.

Scanning film

Scanning film

  Each restorer clicks the mouse at least 20 thousand times a day. From this point of view, film restoration needs patience and professionalism.

  The repair time of a frame is as short as a few seconds, and as long as several hours or even days. The total duration of "Never Gone Radio Wave" is 116 minutes, and the whole film has 165,000 frames. With such a huge amount of work, people who can persist must have a heart that loves movies.

  Film restoration is a technical activity, which also needs creative aesthetics. When the physical restoration and digital restoration are over, the film restoration will reach a higher level — — Art restoration.

  That is, follow the principle of "repairing the old as before" and try to restore the film to the maximum extent.

  Specifically: the granularity of the film picture, the tone of the film with a sense of time, the color of clothes, the shadow of tables and chairs, the color of people’s skin, the depth of field of the lens and so on.

  Every place should be reproduced in combination with the original style of the old movie. The person who knows this film best is the creator of that year. To this end, the project restoration team invited the film’s creative staff to the scene as much as possible to guide, try to find the director and photographer at that time, follow their ideas, and determine the restoration standards.

Comparison before and after repair

Comparison before and after repair

  Black and white to color:

  In addition to AI, there is more ingenious "color archaeology"

  "Never Gone Radio Wave" was originally a black-and-white film. To achieve complete restoration, it is necessary to convert the black-and-white image into a color image through AI and artificial coloring technology after completing the triple restoration.

Comparison before and after repair

Comparison before and after repair

  This time, the restoration team combined the human-computer interactive AI coloring with independent intellectual property rights in China with traditional restoration techniques to restore and color the original black-and-white image of the film frame by frame.

  AI has greatly improved the overall work efficiency, but the soul of repair still needs artificial ingenuity. Because there are so many complex elements in focus plane, the current AI technology has limited ability to identify complex objects, and it is often impossible to track the details of moving side face and hand shape changes. At this time, it is necessary to manually solve them frame by frame.

Comparison between AI and artificial coloring effect

Comparison between AI and artificial coloring effect

  In order to make the color of the film more accurate and appropriate, the project restoration team composed of Central Video and Film Archive also launched a large-scale "color archaeology".

  In the film, Bai Lijun, the liaison officer of the underground party, was waiting for the elevator in the Peace Hotel. The lens hurriedly swept a decoration, and the material could not be seen in the black and white environment. The repair team specially contacted Shanghai Peace Hotel and finally determined that it should be the color of blue and white porcelain.

  In order to determine the color of the cheongsam that appears many times in the film, the team specially visited the non-genetic inheritor of the traditional cheongsam in China, and judged the color through the material, lightness and technology, thus giving the cheongsam of the female role in the film a three-dimensional sense, gloss and texture again.

Refer to a large number of cheongsam materials

Refer to a large number of cheongsam materials

  In order to verify the cover color of the thread-bound book A Dream of Red Mansions, which was used by the leading actor Li Xia to transmit information, the team specially invited experts from the Dream of Red Mansions Society, and finally decided that the cover should be the light blue cover of the lead-printed book at that time.

Experts analyze the cover color of A Dream of Red Mansions in the film

Experts analyze the cover color of A Dream of Red Mansions in the film

  In order to color the lips of female characters in the film, the team studied in detail the brightness differences of reddish, vermilion and crimson in black and white pictures, comprehensively considered the role identity and character characteristics, and matched female characters in different camps and stages with bright or elegant colors.

Consider the characteristics of female roles

Consider the characteristics of female roles

  Rebuilding "hearing":

  5.1 surround sound, to achieve real sound immersive.

  When the picture is upgraded to 4K, the sound quality will naturally be repaired simultaneously to meet the current cinema screening standards.

  Generally speaking, movies divide sounds into five categories: dialogue, environmental atmosphere, special effects, onomatopoeia and music. The project repair team must first separate all kinds of sounds, then remove the noise, and then re-complete the mixing recording according to the sound phase of the picture.

Sound restoration process

Sound restoration process

  At the same time, according to the picture, the ambient sound is supplemented to enrich the indoor ambient sound, so that the hearing is more telepresence, and the sound is used to supplement the picture for the second time, adding some human voice environmental effects.

  In the end, the black-and-white to color 4K restoration version of "Never Gone Radio Wave" was converted from the original stereo to 5.1 surround sound.

  When watching in the cinema, we will feel a more realistic sound field, and we can appreciate the soul-stirring of the hidden front in the revolutionary era.

  As the first film in New China about the hero of the Party’s hidden front, The Never-Gone Radio Wave is almost the "model" of all the domestic spy films.

  Li Xia, played by Mr. Sun Daolin, has influenced generations of Chinese with his image of Communist party member, which is optimistic, resolute, fearless and courageous.

  Good movies and true heroes should not and cannot be buried by time and space.

Sun Daolin plays Li Xia.

Sun Daolin plays Li Xia.

  Although film restoration doesn’t need high-intensity and orderly cooperation like shooting on the set, it still needs a clear division of labor and seamless cooperation.

  The project restoration team dispatched hundreds of people before and after, and it took seven months to finally complete the restoration of 165,000 black-and-white images of Never Died Radio.

  Chunhua Qiushi, staying up late again and again, comparing frame by frame, and making a little adjustment, finally handed over this answer sheet with renewed vitality.

Repair the coloring process

Repair the coloring process

  Every frame, every second, is a tribute to the hero and a call for fine works of art.

  On October 6th, in the golden autumn season, Observer Jun invited you to walk into the cinema together to see the brand-new scenery of this red classic!

  Producer ▏ Fan Yun Yang Hua Yang Jihong Zhang Lisheng

  Editor ▏ Xu Chaoqing Wang Jian Liu Shuang Lian Xinyuan Yan Shuang 

  Editor-in-Chief: Zhang Yadong Cui Yahua

  Written by Zhang Haitian

  Material ▏ Gong Taoran

  Editor Sun Jiatong Zhang Haoran Zhang Tao

In 2025, New Year’s Eve entered a two-digit countdown, and the New Year’s Eve was coming "too soon".

New Year’s Eve is the evening of the last day at the end of each lunar year, that is, the eve of New Year’s Day. This day is usually on the 29th or 30th of the twelfth lunar month in the summer calendar, so it is also called the 30th of the year, which is one of the most important traditional festivals of the Han nationality.

Today (October 20th),There are 99 days before year of the snake New Year’s Eve in 2025, and the countdown to the Chinese New Year has entered two digits.This year’s New Year’s Eve is on January 28th, 2025, and the lunar calendar is the 29th lunar month. It is still New Year’s Eve without the Lunar New Year’s Eve. One year’s time is fleeting, and netizens feel that time has passed too fast.

Enter a two-digit countdown on New Year’s Eve in 2025.

Triggered a hot discussion among netizens

Some netizens said:It’s too fast. I watched the countdown go from 3 digits to 2 digits.

Some netizens said:"There are still 10 Chinese New Year holidays in 10 days." "If you haven’t saved any money this year, it will be gone."

Beijing, Shanghai and other places have already begun to grab New Year’s Eve.

Many restaurants, hotels and private rooms are fully booked.

The National Day promotion has just passed, and it seems to be still early for the Chinese New Year. But people in Beijing, Shanghai and other places have begun to grab the New Year’s Eve dinner.

According to the Beijing News, in Beijing, many restaurants received orders for New Year’s Eve dinner as soon as the National Day was over. The heads of a number of catering enterprises predict that from the current booking situation, the New Year’s Eve market in 2025 may usher in a more eye-catching "transcript". In an interview with reporters, a person in charge of catering in Beijing said that the dining reservation for the 2025 New Year’s Eve and the Spring Festival holiday was officially opened on October 8 this year, which is also a "tradition" in the store for many years. "Every year, before the door is opened, many consumers are waiting in line at the door." Up to now, the store has booked 144 tables during the New Year’s Eve and the Spring Festival, including 65 tables for New Year’s Eve and 79 tables for holidays from the first day to the seventh day. All the rooms on New Year’s Eve have been booked.

In another restaurant in Beijing, the earliest 2025 dinner order came from New Year’s Eve in 2024. The person in charge said that many guests directly placed orders for the next year’s dinner after eating the New Year’s Eve reunion dinner. Up to now, the lunch room of the restaurant on New Year’s Eve in 2025 has been basically booked. Tao Ran, the manager of the store, said that some customers came to have a family dinner during the National Day and booked the private rooms for the Spring Festival dinner. At present, the private rooms for dinner on New Year’s Eve are all fully booked.

In Shanghai, the popularity of the New Year’s Eve market has also begun to "heat up". According to the Morning News, the reporter learned from many old brands, hotel chains and popular restaurants in Shanghai that the reservations for New Year’s Eve are being opened one after another, and the boxes and the "first half" batches of New Year’s Eve are among the hottest, and many of them have been booked out.

"Our store started late this year. On October 7th, the on-site reservation was opened at 6:30 am, and the first batch of private rooms and halls were fully booked at 10:30 am." A hotel clerk in Shanghai said.

On the other hand, the reporter also found that customers who need a large table with more than 10 people are not easy to book a large table with more than 10 people because of the relatively narrow choice. "Our biggest thing is that we can sit at a table for 10 people, and 12 people can squeeze. No more will do. However, you can put two adjacent tables for 10 people in the same space, so that you can walk around and communicate with each other. " A hotel clerk in Shanghai told reporters.

From this year

There is no 30 years in five consecutive years.

It is reported that last year, the Lunar New Year’s Eve in the Year of the Loong was February 9, 2024, which was "the last 30th anniversary in recent years".

becauseFrom 2025 until 2029, New Year’s Eve for five consecutive years is "New Year’s Day 29".These days are: January 28th, 2025, February 16th, 2026, February 5th, 2027, January 25th, 2028 and February 12th, 2029.

Why is the New Year’s Eve sometimes absent?

It turns out that this is all caused by the moon. The China lunar calendar calculates the number of days in a month according to the change of the moon phases, which is called "the period of the first lunar month" in astronomy. The day of "New Moon" is the first day, on which people can’t see the moon at all. The date of "Wang" is fifteen, which is the time of the full moon. Because the relative motion among the moon, the earth and the sun is not static, the "period of the first lunar month" is long and short. The average length of a lunar month is 29.53 days, which is not an integer, but the number of days in a month should be expressed in integers, so sometimes it is 29 days in a small month and 30 days in a big month. In order to ensure that the first day of each lunar month must be the new moon, the arrangement of the big and small months is not fixed, which needs to be determined through observation and scientific calculation. It is not uncommon for the twelfth lunar month to meet a small moon, which will appear in about three to five years. In 2013, 2016, 2022 and five years from 2025 to 2029, there was no 30th anniversary. However, because the average length of the first lunar month is more than 29 days, the number of big moons is slightly more than that of small moons every year. Although New Year’s Eve will "disappear", New Year’s Eve, as a traditional festival, has always been there, whether it is the 29th or 30th of the twelfth lunar month.

After learning about this, netizens said: interesting knowledge has increased again.

Finally, let’s talk about a magical thing:The first month of leap in 2262.

Therefore, there are two Spring Festival in 2262.

How to implement the requirement of "accelerating the development of long-term rental housing" in the government work report?

Under the background of "housing without speculation", China’s long-term rental market has entered a fast lane of development.

From last year, the NPC and CPPCC first proposed "improving the long-term rental policy" and "standardizing the development of the long-term rental market" to this year’s "Government Work Report" clearly stated "accelerating the development of the long-term rental market", the change of this formulation released a clear signal that the long-term rental market has achieved significant development results in the past year and will become an important starting point for safeguarding people’s livelihood stability, promoting consumption growth, stabilizing the real estate market and promoting urbanization in the future.

Among them, especially the development of institutionalized long-term rental housing has become an important working idea for relevant departments to improve the construction of housing rental system and solve urban housing problems. This year’s "Government Work Report" emphasizes "accelerating development", which is more clear and directional, and also highlights the urgency. This is an important leap for the national government to change from cognition to recognition of the development of the housing rental industry, and will also guide and promote the housing rental industry to a high-quality development period.

Affordable rental housing and institutionalized long-term rental housing assume different development functions.

To vigorously develop the housing rental market, it is first clear that the important starting point is to develop rental housing with legal entities, which can be government organizations or enterprise operations, which will help the competent authorities to quickly improve the market management system and solve the problems of information asymmetry, lack of filing of housing and unstable lease period in individual landlords’ rental.

In the process of development, we should adhere to the idea of "policy-oriented and affordable rental housing" and "market-oriented and institutionalized long-term rental housing". With the gradual improvement of the housing rental system, the two should be gradually distinguished and play different functions.

As a kind of welfare policy, the main function of "policy and security rental housing" is to maintain and stabilize the healthy development of society, so it should play a "bottom-up" and "supplementary" role. And "market-oriented, institutionalized long-term rental" should gradually become the main force of the housing rental market, and it should be able to undertake the stock housing of "purchase type" and "own type" in the past to a great extent, so that these houses can return to their proper living attributes and truly produce the proper value of the housing. From this perspective, it is necessary to make market-oriented and institutionalized long-term rental housing the main body, and to cultivate and support specialized and large-scale housing rental enterprises, which is also the key to implementing "staying and not speculating". Only by hierarchical classification and orderly promotion can we comprehensively improve the supply level of rental housing and meet the diversified rental needs of different types of people.

The development experience of market economy has also proved many times that any industry must take the road of institutional development if it wants to establish a certain scale operation ability, and so does the housing rental industry. In this process, the government can give full play to its guiding and supporting role, keep the general direction of people’s livelihood and the general trend of the industry. We should take a more open and inclusive attitude towards market development, "delimit the red line and keep the bottom line" and give professional housing leasing enterprises more autonomy in order to maximize the efficiency of institutionalized management.

Encourage idle housing to be transformed and rented by specialized housing leasing enterprises.

Institutional long-term rental is an important development direction of housing rental industry. On the macro level, we should understand the significance of accelerating the development of long-term rental market from the perspective of the essence of socialist system and improving people’s livelihood during the 14 th Five-Year Plan period, and constantly improve the status of institutionalized long-term rental. At the micro level, professional housing leasing enterprises can establish the reputation of long-term operation, which can effectively unify the demands of both landlords and tenants. Institutionalized long-term rental can not only make tenants consume, choose and move in quickly, but also reduce the management cost of landlords and solve the problems of outdated facilities, aging decoration and mismatched apartment types between supply and demand.

However, in China’s major megacities, the proportion of institutionalized long-term rental is still relatively low, and the market statistics are less than 5%. There is still a lot of room for development and more policy encouragement is needed. The first is policy subsidies. Germany has a good experience for reference. The government subsidizes institutionalized long-term renting, which not only ensures that enterprises can hold houses for a long time and rent them for a long time, but also suppresses the rise of rents, and will not cause tenants to be driven away because it is difficult to pay rents. Combined with China’s national conditions, the National Development and Reform Commission and the Ministry of Housing and Urban-Rural Development can, in conjunction with local governments, select a number of representative and large-scale housing leasing enterprises to be included in the key support scope of the government, give them policy and financial support, and enable them to play a leading role in scale and undertake more functions to alleviate urban housing problems.

Secondly, it is necessary to increase the market share of institutionalized long-term rental housing in big cities, especially in places with large population inflow and large demand for rental housing. For example, in Beijing, for a long time in the past, urban development interacted with the "house-buying economy". At that time, many property buyers took a fancy to value-added space and bought houses in the suburbs of the city. With the acceleration of urbanization, the outward agglomeration of high-tech industrial zones has driven the inflow of talents, resulting in a large number of rental demand. Therefore, under the general tone of "living without speculation", in areas with large rental demand, individual landlords with idle houses should be encouraged to rent, especially entrusted to specialized housing rental enterprises. On the one hand, it can stabilize the fluctuation of rental market caused by demand growth, and play the role of institutionalized long-term rental to stabilize rents and stabilize the market; On the other hand, filing by enterprises facilitates the unified management of the government and can prevent the emergence of a "gray" zone of supervision.

Take measures to help the long-term rental market to be stable and far-reaching

"Accelerating the development of long-term rental market" is the key to meet the rigid demand for housing and form a healthy ecology of "rent" and "housing" in the next period.

For housing rental enterprises, first, they should be aware of their corporate social responsibilities with prudence, seek development based on the long term, and constantly provide higher quality residential products and life services. The second is to give full play to the role of institutionalized long-term rental, give full play to professional advantages in management, operation and efficiency, and contribute to the government’s "alleviating housing problems in big cities" quickly and efficiently. Third, large-scale representative enterprises should play a leading role, constantly expand their business boundaries based on leasing functions, and form an industrial matrix of "rental products, rental services, rental industry Internet, and rental living areas integration".

For the government, the first is to improve tax, financial and land support policies, inject "new kinetic energy" into the development of long-term rental housing, and accelerate the structural reform of housing supply side. Second, in the construction of urban leasing system, we should enhance the participation of housing leasing enterprises, so as to quickly improve the government-guided and market-oriented housing leasing system. The third is to advocate institutional development with an open attitude, so that institutions can give full play to the advantages of specialization, scale and service refinement, and help the housing leasing industry to be stable and far-reaching

The author is Chinese People’s Political Consultative Conference, member of the Standing Committee, and President of China Institute of Economic Thought and Practice, Tsinghua University.

Depth Holography: The Encounter of Holography and Depth Neural Network

Written by | Zheng Shanshan and Zhang Xiangyu

Description | This article is submitted by the author (research group).

With the rapid development of mathematical optimization and computing hardware, deep neural network(Deep Neural Networks, DNN)(noun explanation >) has become a powerful tool to solve many challenging problems in various fields, including decision-making, computational imaging, holographic technology and so on.

Since its development in 1947, holography(holography)(noun explanation >) has become an important and extensive technology, and has applications in various fields of optical engineering, including optical imaging, microscopy, metrology, three-dimensional (3D) display and so on. Holography means containing all information of light waves, which is physically divided into two processes: recording and reconstruction of wavefront, both of which can be realized by optical or digital methods.

At present, the two different fields of holography and deep learning have merged with each other, forming a new interdisciplinary field-depth holography.

Recently, from Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of SciencesSitu guohaiResearcher with Deep holography For the topic of Light: Advanced Manufacturing In this paper, a review article was published, and the progress of depth holography was comprehensively reviewed.holographic(holography)andDeep neural network(DNN)The mutual promotion relationship between them.

Dnn has been proved in holographic reconstruction and computer generated holography.(computer-generated Holography, CGH)Almost all aspects of the application;

● Holography has the ability of interconnection and parallel processing of light speed, which is an optical realization of DNN, that is, optical neural network.(optical neural networks, ONN)(noun explanation >).

In this paper, the basic theory and architecture of DNN are briefly introduced, then some important progress and research trends of depth holography are discussed, and finally its future prospect is prospected. I hope this review can promote the further development of this field.

Deep Neural Networks: A Concise Introduction

The conceptual framework of DNN is shown in Figure 1. Feedforward neural network, or multilayer perceptron.(MLP)There is an input layer, an output layer, and one or more hidden layers. Each layer can have a different number of neurons, called perceptron; And each unit receives the weighted sum of its inputs from the upper layer.(Except for the first layer, its input is the original image to be processed by NN). The goal of feedforward neural network is to optimize an NN model to approximate a continuous function.trainAft learning that network parameter,The mapping from the input space x to the output space y can be realized.

Figure 1. Conceptual architecture of DNN (Source: Light: Advanced Manufacturing)

Compared with the traditional holographic technology based on physics, DNN method has been proved to have unique advantages. As long as there is enough data, DNN can learn features from the higher-level structure composed of lower-level features, but it can’t clearly express the exact physics of the system, which leads to great challenges to the generalization and interpretability of the method.

Therefore, we very much hope that we canGive full play to the advantages of DNN and physical model at the same time, develop DNN based on physical information.(Physics-informed DNN).

● Physical integration(physical fusion), or a single physical DNN.

It directly inputs the solution of physical model as DNN model.(part).

● Residual physics(residual  physics), or recursive physical information DNN

Add physical solutions to the output of DNN, so that DNN model only needs to learn the mismatch between model-based solutions and the real situation.

● Regularized physics(physical  regularization), or concatenated physical information DNN.

The regularization term in a set of physical constraints is used to punish the network solution. The regularization term can be used as part of the loss function or through the physical reconstruction process.  

● Embedded physics(embedded physics)DNN

As shown in Figure 2, the central idea is to bring the physical model into the network optimization cycle.

Figure 2. Typical architecture of DNN embedded in physics (Source: Light: Advanced Manufacturing)

● Network approximate physics

As the name implies, the physical model is approximated by using DNN.

Holographic reconstruction

Hologram can be regarded as the superposition of object light and reference beam. The intuitive method of holographic reconstruction is based on the physical model of diffraction, that is, the numerical calculation of wave diffraction process. Off-axis holography can be solved by spatial filtering, but spatial filtering will bring the loss of high-frequency components, which greatly hinders the quality of reconstructed images. For coaxial holography, the removal of zero order is relatively simple, so most of the research on coaxial holography reconstruction is to deal with twins.

Physically, twin images are actually out-of-focus copies of reconstructed object images, which can be eliminated by subtracting out-of-focus images. At present, the most widely used strategy is to adjust some physical parameters of the optical system and obtain the corresponding holograms, so as to establish a small linear equation set, and to link the recorded holograms with the tuning parameters, and then solve the object wavefront.

Mathematically, the twin image artifact is caused by the lack of phase when the hologram is recorded. This shows that if the missing phase of the hologram can be solved, the twin image artifacts can be solved.

Holography inspired by DNN

1) The most direct method: "end to end" DNN

EHoloNet developed by ResNet and U-Net: receiving the original digital hologram as input, and generating the phase object wavefront without artifacts;

Y-network architecture: simultaneously reconstruct intensity and phase from a single digital hologram;

It is also possible to generate a countermeasure network(GAN)Implementation, training data does not need to be paired.

2) Physical fusion, or DNN of single physics.

The traditional numerical free space is used to propagate back to the target plane, and then the amplitude and phase of the reconstructed wavefront are sent to DNN respectively, and all these artifacts are removed by training.

3) physically embedded DNN

As shown in Figure 3, this strategy has two obvious advantages by incorporating the physical imaging model into the traditional DNN:First of all, it does not need any data for pre-training; Secondly, the reconstructed image satisfies the constraints imposed by the physical model, which is interpretable.

DNN model in PhysenNet can be replaced by other neural networks, depending on the task at hand. For example, researchers have successfully incorporated the phase imaging model into the GAN network.

Figure 3. Schematic diagram of DNN incorporating physical model: phase imaging (Source: Light: Science & Applications, 9: 77 (2020).)

In addition, DNN method can also be used to solve various problems related to holography.Such as phase unwrapping, autofocus, phase distortion compensation, speckle suppression, computer generated holography (CGH).

DNN inspired by holographic technology

Holographic technology is to realize optical neural network.(ONN)One of the important ways.

The early research includes the optical realization of fully connected neural network and Hopfield model, which is a cyclic neural network.(RNN)The foundation of. Holographic neural network does not use logical neurons like digital neural network, but relies on the interconnection of hologram itself. In a fully connected holographic neural network, the weights are stored in the pixels of the hologram.(neuron)Medium. a layer or deck(hologram)Each neuron simply modulates the light shining on it from the upstream layer and then illuminates the downstream layer. Holographic neural network can be realized by photorefractive crystal, which is a three-dimensional device in itself and may store billions of weight data. Therefore, it is hopeful to solve large-scale reverse problems in principle.

Figure 4. Schematic diagram of diffraction depth neural network

(a) DNN contains a plurality of transmission (or reflection) layers, in which each point on the layers acts as a neuron with a complex transmission (or reflection) coefficient, and the transmission or reflection coefficient of each layer can be trained using deep learning, thereby performing a function between the input and output planes of the network. After the learning stage, the design of D2NN is fixed; Once it is manufactured or printed in 3D, it can perform the learned functions at the speed of light. Different types of diffraction depth neural networks: (b) classification and (c) imaging. (Source: Science,361(2018))

The modern realization of holographic neural network takes advantage of diffraction, so it is named diffraction depth neural network.(D2NN), as shown in Figure 4. In hardware implementation, the hologram in D2NN is actually a diffractive optical element.(DOE)It can be realized by 3D printing, nanotechnology, or electrically addressable digital micromirror devices.(DMD)Get. Like many other optical neural networks, the original D2NN was trained offline. In order to implement better training strategies, researchers have made a lot of efforts, such as back propagation technology to update unit weights through gradient transformation from Euclidean space to Riemannian space, and methods to realize optical grouping. People have also studied the applications of D2NN in logic operation, optical information processing, holographic reconstruction, pulse shaping, single pixel machine vision of spectral coding and so on.

Summary and prospect

The integration of holography and neurocomputing has greatly promoted each other’s development, and also provided us with a wonderful field to explore.

For holography inspired by DNN, this paper discusses five different ways to incorporate physical information, and shows their applications in solving various problems related to holography.

● In addition to trying different DNN architectures,An important trend is to incorporate physical models into DNN models.. This idea has been paid close attention by researchers in different fields.

● PhysenNet embedded in physical model has obvious advantages, but its optimization speed is slow.For lightweight network structure and more effective training algorithmMade a request.

● Comprehensive utilization of the advantages of physical prior and traditional data-driven methodsIt can make the training more effective, improve generalization and increase interpretability.

For DNN inspired by holographic technology, most of the research published so far focuses on optical reasoning. The parallel processing ability of the holographic neural network at the speed of light does guarantee powerful reasoning ability, even surpassing the performance of Tesla V100 tensor core GPU, the top product of Nvidia, in some tasks.

In order to give full play to the advantages of optics, it is necessary toOn-line training of network by optical means.There are many possibilities to effectively implement most basic functions in DNN. 

● Relying on the development of new optical materials and equipmentThe wave can be modulated at high speed at sub-wavelength scale to improve the performance of D2NN.

● The rapid development of neural computing provides us with more powerful algorithms., such as spike neural synaptic network (SNN), can simulate the behavior and learning potential of the brain. The applicability and potential of these new algorithms in holographic technology need to be tapped.

Thesis information

Situ. Light: Advanced Manufacturing (2022)3:13 

http://doi.org/10.37188/lam.2022.013

Welcome the submission of the research group-press release

Reprinted/cooperated/contributed by the research group, WeChat:447882024

Take you to read 1 document every day!Join >Light reading club

State Taxation Administration of The People’s Republic of China announced seven typical cases of tax fraud and false opening.

nine

  Cctv newsAccording to the website of State Taxation Administration of The People’s Republic of China, recently, local tax authorities, together with public security departments, have successfully investigated and dealt with a number of illegal cases in a special campaign to crack down on tax fraud and false issuance, maintaining a high-pressure situation in cracking down on tax-related illegal acts, effectively maintaining the normal tax order and effectively creating a fair and just business environment. Seven typical cases of tax fraud and false opening are now exposed.

  1. Beijing "11.01" falsely issued special VAT invoices.

  In March 2017, the Beijing Municipal State Taxation Bureau and the public security organs successfully investigated and dealt with the case of Beijing "11.01" falsely issuing special VAT invoices. It was verified that during the period from May 2013 to October 2016, the criminal suspect Li created the illusion of normal purchase by lending the mobile phone agency qualifications of two enterprises involved in the case, and obtained a special invoice for falsely issuing VAT input. The criminal suspect Lai Mou and others falsely issued 20,000 special VAT invoices to 1,662 enterprises in Hebei, Tianjin and other places by means of separating tickets from goods, changing the name of goods, signing false purchase and sale contracts and forging capital flow, involving an amount of 3.55 billion yuan and a tax amount of 600 million yuan. The State Taxation Bureau of Beijing issued a Notice of Confirmed False Issuance to the local tax authorities of downstream drawee enterprises. At present, the case has entered the judicial process.

  Two, Jiangxi "6 16" false special VAT invoice case.

  In July 2016, the State Taxation Bureau of Jingdezhen City, Jiangxi Province successfully investigated and dealt with the case of "6 16" falsely issuing special VAT invoices in Jiangxi Province. It has been verified that from August to November, 2015, three enterprises, Jingdezhen Mingmen Trading Co., Ltd., Jingdezhen Remote Metal Products Co., Ltd. and Jingdezhen Baoping Trading Co., Ltd., made fictitious capital transactions without production and business premises, processing capacity, employees and transportation behavior, accepted special VAT invoices issued by a trading company with the name of "AU99.99 Standard Gold", and falsely issued goods with the name of "Au 99.99 Standard Gold" to downstream enterprises. Jingdezhen State Taxation Bureau has issued a Notice of Confirmed False Issuance to the tax authorities where the downstream drawee enterprises are located, and transferred the case to the public security organs for handling. At present, the case has entered the judicial process.

  Three, Gansu "4 11" false special VAT invoice case.

  In April 2016, Gansu Provincial State Taxation Bureau successfully organized and investigated the case of "4.11" falsely issuing special VAT invoices. It has been verified that during the period from July 2015 to January 2016, two fraudulent gangs with Han and Zhang as actual controllers used other people’s identity information to falsely register companies and obtained 2,268 fraudulent VAT invoices by paying handling fees, involving an amount of 233 million yuan and a tax amount of 34 million yuan; At the same time, in the absence of actual business, 2088 special VAT invoices were falsely issued to 76 enterprises in 32 cities in 18 provinces such as Guangdong and Henan, involving an amount of 192 million yuan and a tax amount of 27 million yuan. The State Taxation Bureau of Gansu Province has issued a Notice of Confirmed False Opening to the tax authorities where the downstream drawee enterprises are located, and transferred the case to the public security organs. At present, the public security organs are handling the case according to law.

  Four, Sichuan "4 27" false VAT invoice case.

  In March 2017, the State Taxation Bureau of Suining City, Sichuan Province and the public security organs jointly investigated and dealt with the case of "4 27" falsely issuing ordinary VAT invoices. It has been verified that the criminal suspects Yang and Wang Moumou falsely registered 57 "shell companies" by using other people’s identity information, and fled after falsely issuing a large number of ordinary VAT invoices in a short period of time without real goods transactions. From January 2016 to March 2016, the gang falsely issued 4,466 ordinary VAT invoices for others, such as "steel", "wood square" and "building materials", involving an amount of 391 million yuan and a tax of 11.73 million yuan. Suining State Taxation Bureau has issued a Notice of Confirmed False Opening to the local tax authorities where the downstream drawee enterprises are located. At present, the case has entered the judicial process, and the main suspect has been sentenced and fined.

  V. Tax fraud case of Hainan Huatai Feng Investment Co., Ltd.

  In July 2016, Hainan Provincial State Taxation Bureau successfully investigated and dealt with the tax fraud case of Hainan Huatai Feng Investment Co., Ltd. It has been verified that during the period from May 2012 to November 2013, the company accepted 228 false special VAT invoices from a furniture company in Bozhou and a wood product company in Shiquan County by paying the billing fee, involving an amount of 20.62 million yuan and a tax amount of 3.51 million yuan. At the same time, in the absence of actual export business, the company obtained relevant export declaration information, altered false export documents, falsely issued 42 export invoices, applied to the tax authorities for tax refund in 17 batches, and defrauded the export tax refund of 3.09 million yuan. Hainan Provincial State Taxation Bureau recovered 3.09 million yuan of export tax rebate defrauded by the company, imposed a double fine, suspended the company’s export tax rebate right for three years according to law, and transferred the case to the public security organ for handling. At present, the case has entered the judicial process.

  Six, Hebei Tianyi Trading Co., Ltd. and other three enterprises tax fraud case

  In August 2016, the State Taxation Bureau of Shijiazhuang City, Hebei Province and the public security organs jointly investigated and dealt with the tax fraud cases of three enterprise groups: Hebei Tianyi Trading Co., Ltd., Shijiazhuang Duobu Trading Co., Ltd. and Shijiazhuang Zuoxiang Trading Co., Ltd. It has been verified that during the period from January 2014 to June 2016, criminal gangs operated separately and cooperated with each other in purchasing goods, invoicing, customs declaration, settlement of foreign exchange, and tax refund declaration, and defrauded the export tax refund of 15.18 million yuan by means of purchasing goods in different places, falsely issuing special invoices for value-added tax, and overstating the value. Shijiazhuang State Taxation Bureau recovered 5.73 million yuan of export tax rebate from three enterprises, and refused to refund 9.05 million yuan, which was regarded as 400,000 yuan for domestic sales, and stopped the export tax rebate right of three enterprises for three years according to law. At present, the public security organs are handling the case according to law.

  Seven, Henan Xuchang Jingying Arts and Crafts Co., Ltd. tax fraud case.

  At the beginning of 2017, the State Taxation Bureau of Xuchang City, Henan Province successfully investigated and dealt with the tax fraud case of Xuchang Jingying Arts and Crafts Co., Ltd. It is verified that from March 2013 to April 2016, Sun Moumou, the actual controller of Xuchang Jingying Arts and Crafts Co., Ltd., and Li Moumou and Zhang Moumou, the criminal suspects, cooperated with each other to commit crimes, bought special invoices for value-added tax by paying handling fees, and used other people’s export customs declaration data to fraudulently report exports, and defrauded export tax rebates of 23.5 million yuan. Xuchang State Taxation Bureau recovered the export tax rebate of Xuchang Jingying Arts and Crafts Co., Ltd. for 23.5 million yuan, and was fined twice. It is planned to suspend the export tax rebate right of the company for three years according to law and transfer the case to the public security organ for handling. At present, the case has entered the judicial process.