Deep Space Fleet

On this day, a major event suddenly happened in the spaceship: Academician Ding of the Wild Wolf Design Bureau let out his voice and wanted to recruit a graduate student among undergraduate graduates, which caused a sensation among the entire candidate group!

Academician Ding has always cultivated doctors, but this time he wants to recruit a master's degree. The opportunity is extremely rare.

Everyone knows that getting in touch with these top talents in advance will have a major impact on their future academic career.

Because there are too many applicants, it is impossible to come here for an interview. The staff had to strengthen the mandatory conditions for registration, and only then sharply reduced the number of applicants to less than fifty.

Zhang Yuan opened the registration interface, and he was relieved when he saw that he could still register due to his hard conditions and test scores.

At this time, Professor Wang Zhong sent a video.

"...that old guy has been persuaded by me, and the next step is up to you. If there is someone more suitable than you who is out of the competition, no one else is to blame. Do you have confidence in choosing one of the fifty masters? "

"have!"

"That's good, I'll wait for your good news!"

...

After a brief preparation, the day of the interview finally arrived.

There were five interviewing teachers in total, two of them were my father's former colleagues, they were relatively familiar, and they all cast kind eyes.

The one sitting in the middle was Professor Ding Zhaodong, and the one on the far left was Captain Ma Tao, who also looked at Zhang Yuan kindly.

"Don't be nervous, lad."

Captain Ma glanced at the materials on the table, and first asked: "You are Lao Zhang's son, we all know it, so there is no need to introduce yourself. I have a question, what did you learn the most from him?" What is one point?"

Nervous, with enough strength, he is not nervous at all.

Zhang Yuan came here casually: "Humble personal character, excellent study habits, unconstrained life style, lofty goals and ideals!"

"stop!"

Seeing the slightly weird smiles of the surrounding professors, Captain Ma asked again: "Tell me what shortcomings he has, and what shortcomings you can't tolerate?"

Zhang Yuan was taken aback, did this captain have any old rift with his father?

Or, just want to make a joke and ease the tense and serious atmosphere?

possible.

Zhang Yuan thought for a while and said: "He always uses his own IQ to demand others. I find it difficult for ordinary people to tolerate this. He thinks many things are very simple, so he orders others to do them casually, but he thinks it is very simple. It takes a long time for others to make things, and they may not even be able to make them...so he always loses his temper for no reason."

Everyone smiled slightly.

Zhang Yuan was a little confused about whether his answer was good or not.

Then it was time for serious questions, and naturally it would not be that kind of ordinary question.

One of the professors asked straightforwardly: "I have read your paper on robot kinematics, which is indeed a very good article. But, have you ever considered the constraint calculation problem of robots with few degrees of freedom?"

"Many industrial robots in reality do not require too many degrees of freedom, and the algorithms in this regard are also different... Do you know anything about 2-RPS-2-SPS four-degree-of-freedom parallel robots? Just say an idea. Well, no need for a long story."

Zhang Yuan thought for a few seconds. In fact, this question is relatively basic: "In terms of the complexity of the structure and the production cost of the parallel robot, a completely symmetrical parallel mechanism has great advantages... the four degrees of freedom of motion The characteristic matrix of the motion branch chain is 3T1R, 2T//2R, 2T⊥2R, 1T3R, 3T2R, 2T3R, 3T3R."

"We first discuss the mechanogenerators in the form of single open chains of these 7 kinematic connections..."

Although he was told not to make a long speech, he still talked for more than ten minutes.

The professor narrowed his eyes, nodded and said, "That's a good answer."

It is not easy to think of so many things clearly in such a short time, which shows that Zhang Yuan's basic knowledge is very solid, and his thinking is quick and his mind is bright.

"...Do you have research on the latest optical chips? Why not vigorously develop quantum chips with more computing power?"

Zhang Yuan thought for a few seconds before replying: "...a photon chip is a computing architecture based on a photon circuit, which is equivalent to using countless miniature optical switches on the chip, and its function is similar to the logic gate in a semiconductor chip... Photon The chip uses light combinations of different wavelengths, phases and intensities to process information in complex arrays of mirrors, filters and prism structures."

"...Like microelectronics, they are all silicon-based semiconductor architectures, so they are equivalent to an extension of traditional chips. Its computing power is more than 10,000 times that of ordinary silicon-based chips, and with current technology, there is still upward development Space."

"Although the computing power of a quantum computer can reach 100 million times or even a trillion times that of a silicon-based chip, it must achieve a relevant number of quantum entangled states. 40-50 entangled states are the limit of current technology, and it is difficult to improve It’s huge. But with this amount of entangled states, the computing power is not as good as traditional silicon-based chips…”

"Thus, quantum chips are good, but without major breakthroughs in theory, it is difficult to develop further, so they are not the current mainstream of research."

"Very good, very correct." The professor nodded slightly. This round not only examines the theoretical basis, but also examines the breadth of knowledge.

Many professors raised many questions, and Zhang Yuan answered them one by one with ease.

"I also have a question." Ding Zhaodong said suddenly.

"Excuse me."

Academician Ding Zhaodong said slowly: "What do you think of the industrialized production of the new civilization? What do you think is the biggest factor restricting the development of the new civilization?"

Is it such a big problem?

Zhang Yuan cleared his throat and replied: "We do have some good industrial foundations. For example, the spacecraft carries the most advanced photolithography machines, some nanomaterial production rooms, and some industrial mother machines. We Some components can be produced, but many upstream industrial chains are completely disconnected."

"For example, the most basic chemical raw materials such as chloroform, caprolactam, and acrylic acid have only a small amount of inventory, and there is no way to produce them if they are used up. If biosynthesis is used, the cost will be too high."

"If you successfully arrive at the target planet and obtain a large amount of material resources, you have to start with the development of the most basic raw materials. In my opinion, the biggest factor restricting the development of civilization is actually... population. Too small a population makes the entire industrial system unable to afford it. Come."

"I once read a report that the minimum population to maintain the earth's industry is 1.6 billion. Although the quality of our population is high enough, the number is only 500,000, which is far from enough."

"That makes sense. In fact, this is one of our concerns..." Before Academician Ding could reply, a professor nodded first.