Free single chapter, content description, popular science, etc. (1)
Before I begin, let me introduce a piece of news that I came across two days ago: a certain type of leukemia has been conquered by a Swiss pharmaceutical company.
The cure rate is 80%. The new medicine needs to transport body tissue to the United States for synthesis, and the single cost is about 2 million yuan. For specific information, book friends can check the news, and then ask the handsome doctor Ling Ran next door for popular science.
Keywords: Japan, medical insurance, leukemia.
That's right, this thing has been included in Japan's medical insurance, and the keyboard warriors are out.
When I mention this news, I actually want to talk about a concept, which is a relatively narrow concept in this chapter, and that is what Imagination classmate Yang Qing said: Technology has no borders.
This sentence is correct. Swiss companies conquer leukemia and benefit the world.
But he missed one sentence: Patents have national boundaries!
That medicine is so expensive!
…………
The reason why we say technology knows no borders is for the sake of the next popular science topic: 5G!
In 5G, the technology promoted by domestic manufacturers such as Huawei is not domestically produced, but the countless patents generated through research on this technology belong exclusively to these companies.
First of all, let me make a point: how to talk about 5G, who should say it, and who should say it to whom is a troublesome matter.
In this single chapter, all the opinions are very one-sided and partial, and can be discussed, but there is no need to argue. It just allows some book friends with vague concepts to roughly understand some of the meaning, and that is the purpose.
5G is a communication standard(?).
When it comes to communications, let’s start our science popularization today.
First of all, let’s start with the crooked theme of this book: human sports related.
There are many predecessors in this sport who have made outstanding contributions to the current scene of flourishing competitive sports.
However, there is such a person and such a woman who are worthy of being remembered in the hearts of all otakus who love this sport!
She is the super beauty, Hedy Lamarr.
Hollywood super beauty!
As a woman born more than a hundred years ago, after looking at her photos, I even think she is more beautiful than Marilyn Monroe!
Hedy Lamarr, born in 1914, passed away in early 2000.
Eileen Chang said that a woman should become famous as early as possible! Located on the other side of the world, her contemporary Hedy Lamarr personally interpreted this sentence.
In 1932, when Hedy Lamarr was 18 years old, a Czechoslovak film company invited Hedy Lamarr to play the heroine of "Charmed" and promised to promote the film to the international market, but there was one special issue.
conditions! As a result, Hedy Lamarr agreed, making her famous all over the world and leaving an important mark in the history of human film.
No film and television information about "Charmed" has been found so far, but the existing relevant literature shows that the condition put forward by the film company at that time was that Hedy Lamarr was required to leave the country naked!
Just imagine, in the 1930s, flower growers were in the middle of the Republic of China, and their minds were still too early to be fully enlightened. Czechoslovakia was also in the recovery period after World War I, and the entire global environment was not as open as it is now.
In 1933, "Charmed" premiered in Czechoslovakia. Hedy Lamarr became the first star in the world to appear naked and was fascinated by men all over the world.
From then on, a new era has arrived!
I couldn't find any images of the movie "Bewitched", which is a very regrettable thing for me, a sports-loving otaku!
Thus, Hedy Lamarr began her legendary life.
Regarding Hedy Lamarr's life, someone summed up: "She can write poetry and dance ballet; she can go to the big screen at the age of sixteen; she can also star in the first nude scene in human history at the age of eighteen. She can be pursued.
A failed man commits suicide; she can make her six husbands feel so ashamed in front of her that they want to commit suicide; she can also sell 680 kisses for more than 17 million US dollars to resist rape. She can confuse all sentient beings in Hollywood with her bad acting skills, and she can stand up to her bad acting skills.
I am engaged in scientific research in the field of communications!”
That's right, this glamorous Hollywood superstar is not only a patriot, she is also a scientific genius!
The time goes back to 1940 during World War II, when Hedy Lamarr and Ansel jointly invented a military communication system that could withstand radio wave interference, namely "spread spectrum communication technology". Its original intention was to combat the German invasion.
In 1941, Hedy Lamarr and composer George Antheil were inspired by the way musical notes were organized and speculated that a radio transmission signal could be sent on multiple frequencies to block interference. This is called
The "frequency hopping" method can prevent radio information from being blocked.
In 1942, Hedy Lamarr and George Antheil obtained a patent for "frequency hopping technology" issued by the United States. They donated it to the U.S. government as military technology, hoping to help in World War II. However, it did not cause the United States to
Due to the government's attention, the patent eventually expired.
In the patent description, a communication method for guiding a torpedo is described, that is, within a fixed period of time, the transmitter and the receiver use a synchronous communication method between the carrier frequency. The launched party (an aircraft at high altitude
) and the carrier frequency used by the receiver (an operating torpedo) are controlled by a device similar to a player piano music tube
, the device has a unique sequence of 88 possible steps. This means that by sending only a small part of the entire message on each frequency, the torpedo can be manipulated. Attempts to interfere with communications can usually only occur at a time.
It means that one channel has lost its function, but the information on other channels is enough to ensure that the torpedo makes the necessary direction correction to hit the target.
However, due to technical limitations at the time, this patent was not produced in real form and was instead sealed by the U.S. military.
I basically don’t understand the above professional terminology. I believe that many book friends are confused like me. Therefore, in the following text, I will try my best to replace all the relevant professional terms involved with other words that I can understand.
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Back to the topic:
Now someone has an evaluation of Hedy Lamarr: "As long as you have used a mobile phone, you need to understand and thank her. You must know that this sexy female star has made contributions to global wireless communication technology that no one has ever made.
Achievable."
Why do you say that?
Because decades ago, due to the limitations of the technology at the time, Heidi's patent was not produced in physical form, but was sealed up by the U.S. military. It was not until the 1950s that a private company independently developed the relevant technology (please note that
Independently developed), and then looked through the patent library and found this already existing patent.
Then, in 1988, this technology was developed by Qualcomm, resulting in the most rogue, most shameless, and most insane company that plays with patent sticks in human history—Qualcomm!
And that technology is called "code multiple addressing"!
If you are confused about its name, there is another name for it: