Computer description 1 hello, my name is computer, 1946 was born in the United States in February. When I was born, I was very big, as big as three teachers. At that time, only some state institutions could own and use me, and at that time, my running speed was very slow. But in just a few years, my running speed has been accelerated many times. The volume of transactions is also gradually shrinking. The scope of application has also expanded. Now a few thousand dollars can take me home.
I have become an indispensable helper for social families. Children can use me to study, play games and exercise their brains. Mom can use me to look at the stock market, and she doesn't have to go to the stock market everywhere anymore. Dad used me to watch football, so I didn't have to stay up late every night. Grandpa uses i query's health knowledge, so he doesn't have to go to the hospital often. This saves money and worry.
Computer description 2 ①DNA computer is a biological computer. The genetic material DNA (deoxyribonucleic acid) molecule is a double helix "long chain" covered with "pearls" or nucleotides. Scientists have found that DNA molecules can express a large number of genetic materials possessed by various cells of organisms through different arrangements of these "pearls". Inspired by this, mathematicians, biologists, chemists and computer experts are cooperating to develop future liquid DNA computers. Using the characteristic that DNA can encode information, it first synthesizes DNA molecules with specific sequences to represent the problems to be solved, then interacts with biological enzymes (here equivalent to addition, subtraction, multiplication and division and Divison) to form various combinations, and finally filters out incorrect combinations to get the correct coded molecular sequences.
(2) Because DNA molecules can carry out a large number of biochemical reactions at the same time, DNA computers are massively parallel in structure. This "test tube" calculation method can theoretically deal with the problems that the silicon chip and current of traditional computers are difficult to deal with, especially those problems in which the amount of calculation increases exponentially with the calculation scale.
(3) DNA computer takes nucleotides as memory and has a very large-scale parallel structure, so the biggest advantage of DNA molecular computer lies in its amazing storage capacity and operation speed. 1 m3 DNA solution can store 1 trillion binary data. More than ten hours of DNA calculation is equivalent to the total amount of calculation since the advent of all computers. In the future, the chips and disks of computers will be replaced by DNA solutions, and its powerful functions will be surprising. And DNA computing consumes very little energy, only one billionth of that of computers.
④DNA computer was born in 1994, and the inventor was LeonardAdleman. Adlerman used a "test tube" DNA computer to do experiments and tested the feasibility of the DNA computer. His "test tube computer" got the result in a few seconds, but it took him several weeks to choose the correct answer.
⑤ Traditional electronic technology will reach the physical limit sometime after 20xx years. Scientists at the University of Wisconsin-Madison have taken an important step in simplifying and expanding this technology. They adopted a different method from the test tube experiments conducted by other pioneers, but fixed the DNA chain on a gold-plated glass slide (DNA chip). Other researchers hope to send DNA computing technology back to living cells. Implanting DNA-based artificial intelligence chips into the brain described in science fiction may be as simple as vaccination in the near future.
⑥DNA molecular computer will be one of the development directions of computer. Now DNA logic gates, DNA data and more advanced things have been designed. The biggest problem of DNA computer now is that the calculation results are difficult to detect. Once this problem is solved, DNA computers will come out soon. But don't expect it to replace the traditional computer (a combination of plastic products and silicon chips) prematurely. Most experts predict that in the future, compared with running word processors and sending e-mails, the application of DNA computers may focus on deciphering passwords and drawing flight routes.
14. What are the three aspects of DNA computer? (3 points)
15. What will happen if the words in the following sentence are removed? (2 points) Implanting artificial intelligence chips based on DNA into the brain described in science fiction may be as simple as vaccination in the near future.
16. According to paragraph ③ of the article, from the operational point of view, write the meaning expressed in the following figure. (3 points)
I am a high-tech product and an intelligent expert. I know astronomy above and geography below, so I can't call it a computer.
In people's eyes, I am a two-faced person. On the positive side, I can help people realize many wishes and solve many complicated problems. Today, all walks of life see me, helping people sell products, helping people find jobs, helping people buy houses and cars, and meeting everyone's needs. I played a huge role. I am an encyclopedia, too. When young master has difficulties in learning, just open me and tap the keyboard with the mouse, and the correct answer will appear on the screen. It can also make people video chat with friends and relatives at the ends of the earth, without feeling the distance at all.
The downside is that many people are crazy about me and use me to play online games every day. Playing games is ok, but enough is enough. If playing games and learning something affect my study, and adults delay their work and forget their responsibilities, then I am a pest. This is not what I want to see. Let's stop making trouble. If children delay a good life because of playing games and don't study hard, will they regret their behavior when they get old?
Computer Description 4 Computer, also known as computer. It is a machine that uses electronic principles to process data according to a series of instructions.
There are two kinds of computers, desktop computers and notebook computers. Desktop computers are suitable for home use and inconvenient to carry. The specification is about 19-28 inches. Notebooks are suitable for going out and using at home. The screen is over 14 inch, which is smaller than a desktop computer.
The computer is mainly composed of six parts: host, memory stick, hard disk, keyboard, mouse and graphics card. Host is the most important part of a computer, and is usually called the host. Memory stick refers to the internal memory that CPU can directly read, mainly in the form of chips. Memory stick is also called main memory. Generally, it is strip-shaped and needs to be inserted into the memory chip on the motherboard to work. The graphics card is an important original to connect the monitor with the PC motherboard. It is inserted into the expansion slot. It is mainly responsible for converting the display signal sent by the host computer to the general electrical signal, so that the display can understand what the PC is asking it to do. There is also a kind of memory on the graphics card, called display memory, which will directly affect the display effect of the monitor. Hard disk, its appearance size is generally 3. Five inches. The usual hard disk capacity ranges from tens of megabytes to several gigabytes. Keyboard and mouse are input devices for personal computers. When the keyboard is tapped, the tapped key will send a signal to the motherboard of the PC. At present, keyboards generally have 10 1 or 106 keys, and some keyboards also have three function keys.
When using a computer, the first thing to remember is the startup sequence. Generally speaking, when turning on the computer, you should turn on the host first, and then turn on the peripherals. There are two kinds of common mice: two-button mouse and pc mouse. Generally, two-button mouse is used. If pc mouse is used, the middle key is not commonly used.
ENIAC, the world's first modern electronic computer. ENIAC lasted for 30 years. 48 meters, 1 meter wide, area 170 square meters, 30 operation desks, about the size of 10 ordinary room, weighing 30 tons, power consumption 150 kW/hour, and the cost is 480,000 US dollars. It contains 17468 vacuum tubes, 7200 crystal diodes, 1500 relays and more than 6000 switches, and performs 5000 additions or 400 multiplications per second, which is 1000 times that of relay computers. But the color is relatively single. Nowadays, computers are not only used for calculation, but also for searching information, watching movies and playing games. The weight of QQ has been reduced from 30 tons to 1-3 kg, and the colors can be selected according to your own preferences, such as cherry red, sky blue, black and so on. Its volume is getting smaller and smaller, its weight is getting lighter and its function is getting stronger and stronger.
Computers should also be used reasonably. If you just play games with the computer for a long time, then the computer will become a killer of vision.
Now computers have become an indispensable thing in people's lives. I believe it is stronger and more perfect.
First of all, let's clarify the relationship between computers. We often say that the computer is a computer, but it is actually wrong, because the computer is just a kind of computer, that is, the "brain (complex and fast image title, an image metaphor)" that calculates through electronics. In the future, there will be a photonic computer (calculating, storing and transmitting information through photons), referred to as "is" for short.
Secondly, what is the difference between supercomputers and ordinary computers (computers)? First, supercomputers calculate very fast. Tianhe II supercomputer developed by China National University of Defense Technology can reach trillions of times per second, ranking first in the world supercomputer list. Second, it is a major drawback of supercomputers, which is huge in size and consumes a lot of power. If allowed, the future molecular computers (DNA computers), quantum computers, photonic computers, nano computers, biological computers and neural computers (with learning ability) may replace the current supercomputers. These computers have faster calculation speed, larger storage capacity and smaller size.
At the opening ceremony of the 2008 Beijing Olympic Games, the dazzling fireworks display spread to thousands of households through TV, and everyone was surprised. You know these fireworks displays are actually 3D animations! This video is only 55 seconds long, but it took the animation department 1 year to produce it. One difficulty after another, and the biggest one is rendering. In order to let the audience experience the real feelings and conform to the high-definition picture broadcast to the world, it is necessary to refine the scene of Beijing to every building and every mobile point, which makes the data amount extremely huge. Animation companies also lack supercomputers that can perform high-speed rendering. In desperation, 200 servers were put together and barely passed. Because 200 servers are built together, it will generate a lot of heat, so the hot air is pumped out by an exhaust fan ... Together, these 200 servers are equivalent to a small supercomputer.
Although the operation speed of supercomputers is very fast now, it still takes a long time to calculate huge data. So it is extremely difficult to calculate these data by people. Scientists are still working on the faster "ultimate computer".
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