WTO harmonization and HS codes

List of Contents of this article:

• 1,Is Oppenheimer, the father of the atomic bomb, the one who writes signals and systems?
• 2, About Oppenheimer, the author of the textbook "Signals and Systems" of Massachusetts Institute of Technology?
• 3. Example questions of Oppenheimer's Signals and Systems. As shown in the figure, what does the underlined formula mean...
• 4
  、Why is Obenheim called Master
• 5, What is the relationship between the signal and the system
• 6, Views on Oppenheimer

Openheimer, the father of the atomic bomb, is the one who writes signals and systems Is it

1. Oppenheim (Alan V. Oppenheim), professor, member of the National Academy of Engineering and IEEE, also serves as the Guggenheim Foundation and Sackle R) Visiting researcher of the foundation.

2. Oppenheimer is a genius with outstanding achievements in physics and mathematics.His achievements include breakthroughs in black hole theory and important contributions to the study of meson theory. His intelligence and diligence have made him highly praised in the academic community.

3. It was Julius Robert Oppenheimer. In 1943, Oppenheimer founded the Los Alamos National Laboratory LANL in the United States and served as the director. In 1945, he led the manufacture of the world's first atomic bomb and was known as the "father of the atomic bomb". After World War II , Oppenheimer briefly coached in science and engineering in California, USA.

4. The undergraduate signal and digital and electrical textbooks of the University of Electronic Science and Technology are Oppenheim's Signals and Systems (second edition, Electronic Industry Press) and John F. Wakerly's Digital Design - Principles and Practice (third edition, Higher Education Press).Both are in English, and undergraduate classes and exams are in English.

5. It's Julius Robert Oppenheimer. In 1943, Oppenheimer founded the Los Alamos National Laboratory (LANL) in the United States and served as director; in 1945, he led the construction of the world's first atomic bomb and was known as the "father of the atomic bomb".

6. People at Alamos Laboratory agreed that without Oppenheimer's extraordinary leadership, it would be impossible for the atomic bomb to be successfully tested and put into use before the end of the war. For Oppenheimer, who became the "father of the atomic bomb" of the United States, this is a kind of pride and a heavy pressure.

Oppenheimer is a genius with outstanding achievements in physics and mathematics. His achievements include breakthroughs in black hole theory and important contributions to the study of meson theory.His intelligence and diligence have made him highly praised in the academic community.

Oppenheim (Alan V. Oppenheim), professor, member of the National Academy of Engineering and IEEE, also serves as the Guggenheim Foundation and Sackle R) Visiting researcher of the foundation.

Professor Alan V. Oppenheim is the chief researcher of the Electronics Research Laboratory (ELE) of the Massachusetts Institute of Technology in the United States. His research field includes signal processing and application in the general field.

In Oppenheimer's Signals and Systems, the underlined formula is the convolutional formula.Convolution is a basic operation in signal processing and system analysis, which is used to describe the interaction between two signals at a certain point in time.

Example questions of Oppenheimer's Signals and Systems. As shown in the figure, what does the underlined formula mean...

1. In this question, we have a sequence x [-1], and it is multiplied by another sequence. According to the description in the question, we can infer that the image is obtained by multiplying two sequences. According to the example of Oppenheimer's Signals and Systems, we can assume that this image is a response function of a discrete time system.

2. Fourier transformAnd inverse Fourier transform Fourier transform is a linear combination of a set of sine and cosine functions that represents a periodic signal. The inverse Fourier transform is to reverse convert a discrete Fourier transform back to the time domain.

3. Although it has been many years since this problem, I still want to tell my later brothers. I have just figured out that this question is Exercise 7 of the second unit of Oppenheimer's Chinese version of Signals and Systems.

Why is Oppenheim called Master

Oppenheim (Alan V. Oppenheim), professor, academician of the National Academy of Engineering and IEEE Fellow, also serves as a visiting researcher of the Guggenheim Foundation and the Sackler Foundation.

Claude Elwood Shannon, male, born on April 30, 1916, graduated from the University of Michigan, American mathematician and founder of information theory.

Professor Alan V. Oppenheim is the chief researcher of the Electronics Research Laboratory (ELE) of the Massachusetts Institute of Technology in the United States. His research field includes signal processing and application in the general field.

What is the relationship between the signal and the system

1. In an abstract sense, both the system and the signal can be regarded as a sequence.However, the system is the mechanism that processes the signal, which is different from the signal. People study systems, design systems, and use systems to process signals and serve human beings.

2. A signal is a function of a single or multiple independent variables, and generally speaking, it contains information about the process and characteristics of a phenomenon, and the system generates other signals in response to a specific signal.

3. The relationship between signal analysis and system analysis is close and has its own emphasis. The former focuses on the analytical representation, properties, characteristics, etc. of the signal, while the latter focuses on the characteristics, functions, etc. of the system. Generally speaking, signal analysis and system analysis are the common theoretical basis of signal transmission, signal processing, signal synthesis and system synthesis.

4. The degree of network coverage of operators varies depending on the region.Urban areas basically meet coverage, but some remote areas may lack coverage, which will lead to poor mobile phone signal.

5. The relationship between the signal and the UI. The quality of the signal strength will affect the UI response speed of the mobile phone system. Poor signal quality will slow down the data transmission speed, thus affecting the loading time and response time of the application, which will make users feel that the mobile phone responds slowly and the application loading time is long.

Opponheimer's view

In general, the evaluation of Oppenheimer's atomic bomb should take into account his scientific achievements, historical status, moral and ethical issues, and later reflection and actions. This evaluation will vary from person to person, depending on personal views and values.

Revelation from Oppenheimer: In the face of all kinds of obstacles in life, you also need to face difficulties. Only when you dare to face life is the greatest reward for life

Oppenheimer's personality, also known as obsessive-compulsive personality. It is manifested as compulsive thinking and behavior, pursuit of perfectionism, excessive attention to details and a strong sense of responsibility. For scientific research, this personality may bring some advantages and challenges.

The closed-door review of Oppenheimer and the public hearing of Strauss, one closed door and one public, one conspiracy and one retribution, one color and one black and white, cross-editing together, itself implies the director's strong irony and criticism.

The theme of the film deeply explores the conflict between science, morality and politics. In the process of developing the atomic bomb, Oppenheimer faced not only technical challenges, but also in-depth thinking about human nature and the world.