Chapter Three Hundred and Thirty-Five: The Melon Is Ripened
Then he said, "If each switch is a proposition, if the switch is closed it is 'true', if the switch is open it is 'false', and the light bulb is also a proposition, if it is lit it is 'true', if it is turned off it is 'false', then the two switches
What is the relationship between the proposition represented and the proposition represented by the light bulb?”
"When only two sub-propositions are true at the same time, the compound proposition is true. This is an 'and' relationship." Feng Shan answered.
"Yu Zhi, what kind of circuit is this? I told you about it last time."
Qian Yuzhi scratched his head and replied: "Series circuit."
"Okay, now you modify this circuit and ask that 'when any switch is closed, the light bulb will light up'." Von Nuo continued.
Qian Yuzhi thought for a moment, removed the two switches from the circuit, then connected the two ends of the two switches with wires, and then connected them to the circuit of the light bulb and battery. Then he took the initiative and said: "Connect the two switches in parallel.
This effect can be achieved.”
"These two switches are in an 'or' relationship!" Li Janai also rushed to say.
"So, what will happen if we add a reading hole touch roller to each card reading unit of the sorting machine and connect it in series with the original touch roller?" Feng Nuo asked again. He glanced at Feng Shan and motioned to her
Don't answer.
"Only when the two contact rollers are perforated, which is equivalent to two series switches being closed and energized, will the relay work and push the card into the card pocket." Qian Yuzhi replied.
"What is its logical meaning?" Feng Nuo looked at Li Janai again.
"This card satisfies the 'AND' of the two simple propositions represented by the two touch rollers." Li Ganai replied.
"That's it! Then if you add a few more contact rollers to each card reading unit and connect them in parallel, you can control the relay to push out the card with any one of the holes. This is equivalent to one of the simple propositions represented by multiple holes.
"Or"!" Qian Yuzhi said happily as if he had also discovered a new world.
"That's it. We will modify it like this tomorrow. Each card reading unit will be equipped with 10 contact rollers and connected in series." Feng Nuo was very satisfied. Qian Yuzhi seemed to have learned a lot recently.
In this way, as long as the question to be queried can be expressed in a disjunctive paradigm of "no more than 10 conjunctive terms, and no more than 10 simple propositions within each conjunctive term", the classification machine can handle it, and its functions will be better than
Much stronger now.
He looked at his watch and saw that it was almost dinner time.
"The last thing I want to say is that this type of function of the classification machine is actually very closely related to 0-1 Boolean algebra. 'AND' and 'OR' are actually operations. We call them 'logical operations', which are the most advanced functions of computers.
One of the core functions.”
"We can see that the logic operations 'AND' and 'OR' are equivalent to the series and parallel connection of the circuit; the switch may be closed or disconnected, the relay may be powered on or off, and the light bulb may be on or off. These
Both states of the component can be used to represent 'true', 'false' or '0', '1'. In the future, there will be other electronic components that can do a better job."
"So, it is very convenient to use electronic circuits to perform logical operations. Moreover, electronic circuits are much faster than mechanical structures, and will be the future development direction of computers."
"Then, here comes the question. The above are all logical operations. But the computer system does not only need to perform logical operations. There are also ordinary addition, subtraction, multiplication and division, exponentiation, square root, and even calculus. These operations are what we call
It is called 'arithmetic operation'. The tabulating machine in the computer system is actually a device used for arithmetic operations. Now we can use mechanical structures to complete the accumulation function. But what if I want to use electronic circuits to do arithmetic operations?
What to do? The switch can indicate true or false, but it cannot indicate a specific number."
Feng Nuo's eyes swept across the three students below, and when he saw their expectant eyes, a bright smile appeared on his lips. He turned around and wrote a line of words at the top of the blackboard.
"There are 10 kinds of people in the world, one understands binary and the other does not."
A few days later, the conference hall of the machinery factory was buzzing with people. This was the place where the industrial department held its regular meeting. The Planning Institute organized a seminar on the punch card computer system here - it was actually a briefing. The purpose was to pass the information to the ministries and commissions under the Government Affairs Council.
Introduce the functions of this system to the powerful departments, so that each unit can go back to study and propose specific application requirements before considering purchasing plans.
The Senate has an urgent need for data collection, management and application, so as soon as the meeting notice came out, including the Planning Academy itself, the land, civil affairs, finance, taxation, auditing, police, finance, political security and other departments and Fubo Army
Many elders and high-level naturalized citizens attended the briefing.
Although Ma Qianzhu was the main leader in promoting this project, he did not attend and only sent a congratulatory letter. The meeting style of the Senate was very concise. Wu De, who presided over the briefing, only took one minute to briefly introduce the background and progress of the project.
, let Feng Nuo come on stage to explain the entire system and answer questions.
Feng Nuo had mixed feelings at this moment, and his eyes were a little sore. It was different from the "fishing" he originally envisioned. He had crossed over n majors, and the machine he built with his own hands felt like his own child.
In the old days, there were no self-produced or imitated punch card computer systems in China, and there were very few Chinese materials. There were only a few manufacturers abroad such as IBM, and the users were often large enterprises and government agencies, and not much information was spread.
The principles and designs are scattered in various documents, and in fact there is no complete information that can be copied or imitated.
In order to design this system, the project team searched almost all electronic materials in the Great Library, found out all the materials related to this primitive computer, even just a few words, and then reorganized and combined them to compile a reference
The brochure has the same height.
The current set of prototypes was created by him and many senior members of the project team who spent many nights and nights studying, discussing, arguing, designing, manufacturing, verifying, modifying, re-verifying, and then modifying...
The design of the mechanical structure and many key components came from other veterans of the research team, but as the main planner, Feng Nuo's excitement was indescribable.
Although this child's "IQ" is not very high, and its appearance is even more silly, big, black and thick, at least it can really start to work. Next, he will further improve it to make it smarter and run
The speed is faster - of course, this also depends on the technological progress of the industrial port.
He knew very well that the mechanical punched card computer was only a transitional product, but this product was the beginning of the more advanced tube and transistor computers in the future. With this simple system, the computer system of the Senate could train the first batch of
Professional computer technicians. They will inevitably become the creators and users of more advanced computers in the future.
Thinking of this, Feng Nuo's heart surged and he almost shed tears.
He calmed down, walked to the speaker's seat, and began to introduce the functions and performance parameters of each component of the punch card computer system one by one...
In the back row of the venue, Li Janai quietly walked out, and it was time for regular contact again.
She felt a little weird. Jia Ben was obviously in a work section not far away, but he had to go to a specific contact point every time. "It would be weird if it was always like this in the future." She thought secretly, not noticing the "organization"
"It is very strange to arrange two "hidden cadres" in such a small area.
"You have done a good job this year, keep working hard." This was Jia Ben's first sentence after meeting.
After saying that, he smiled. Li Janai didn't know that Jia Ben could also laugh. But his expression immediately returned to seriousness and added, "These are not my words, these are the words that Comrade Regional Commander entrusted me to give to you."
conveyed".
"Yes! Thank you for the organization's encouragement and trust!" Li Janai quickly stood at attention and saluted.
Jia Ben waved his hand and told her to relax. "In a few days, another comrade will contact you." He said seemingly casually, "Now that you are here, I will probably transfer you away soon. From now on, you
You should pay more attention to the machinery factory, I don’t need to say more.”
He did not mention that he might be transferred to Guangdong, and the Senate was preparing a metal processing enterprise in Foshan; nor did he mention that Li Janai had done a good job in punch card machines during this period, and the superiors might consider transferring her to work part-time in the technical department——
The elders of the Political Security Bureau had an urgent need to establish a detailed and fast filing system, which was famously used in concentration camps back then.
"Do you have any other questions?"
At this time, Li Janai was uncharacteristically embarrassed and took out a document and handed it over, "What is it again?" Jia Ben asked as he took it.
"A love application?" When he saw the words above, Jia Ben was stunned for a moment, and then he laughed again - this time he laughed for much longer than before, as if he had seen something particularly interesting. He looked
After glancing at Li Janai, the girl's face felt slightly hot, but she looked at him seriously.
According to the regulations of the Political Security Bureau, "hidden workers" like Li Ganai are required to implement the "important personal affairs reporting" system. Romance can also be regarded as an "important personal matter."
Jia Ben put away his smile, but there was still a trace of smile on his face, "Are you serious? I don't encourage you to hand this in - you are still young, and now you are the chief's student, and you have a bright future."
Li Janai's face turned redder, but she still didn't answer and looked at Jia Ben stubbornly.
Jia Ben was a little helpless. He put the envelope in his pocket and said, "Okay, according to the regulations, you have this right. However, you have to know that according to your status, even if Qian Yuzhi is a martyr, the political rating
It’s quite high, and it will take a long time to get the application approved.”
"Thank you." Li Janai's voice was as thin as a mosquito, "It's okay, I'm willing to wait."
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Next update: Volume 7 - Strategy of Guangdong and Guangxi Chapter 62