astronomy

Keh-Yung Cheng

Keh-Yung Cheng is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Keh-Yung Cheng rather than just read about it. In short: Keh-Yung Cheng is a Taiwanese electrical engineer and semiconductor materials scientist known for his work on III–V compound semiconductors and molecular beam epitaxy (MBE). He served as a professor at the University of Illinois Urbana-Champaign and later returned to Taiwan to serve at National Tsing Hua University.

Key takeaways

Keh-Yung Cheng belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Keh-Yung Cheng to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Keh-Yung Cheng from memory before moving on to harder problems.

Reference excerpt

Keh-Yung Cheng is a Taiwanese electrical engineer and semiconductor materials scientist known for his work on III–V compound semiconductors and molecular beam epitaxy (MBE). He served as a professor at the University of Illinois Urbana-Champaign and later returned to Taiwan to serve at National Tsing Hua University.

Early life and education Cheng received his Bachelor of Science in Electrical Engineering from the Chung Cheng Institute of Technology ( now NDU IST ) in Taiwan in 1969. He later pursued graduate studies at Stanford University, receiving:

M.S. in Electrical Engineering (1972) Ph.D. in Electrical Engineering (1975)

Academic and research career

After completing his doctoral studies, Cheng returned to Taiwan and taught at the Chung Cheng Institute of Technology from 1975 to 1979. He later joined Bell Laboratories, where he worked with semiconductor pioneer Alfred Y. Cho on molecular beam epitaxy and compound semiconductor materials. During this period he contributed to: rotating substrate holder designs for MBE systems, improved mobility in InP-based heterostructures, development of GaInAs/AlInAs/InP high electron mobility transistors (HEMTs). In 1987 Cheng joined the faculty of the University of Illinois Urbana-Champaign, where he conducted research on III–V semiconductor materials, nanostructures, and optoelectronic devices. He directed several major research programs including: Broadband Optical Switching Systems Center (BOSS Center), Center for Heterostructure Materials and Devices (HUNT Center). After retiring from UIUC, Cheng returned to Taiwan and served as Dean of the College of Electrical Engineering and Computer Science at the National Tsing Hua University.

Scientific contributions Cheng's research focuses on epitaxial growth and device physics of III–V compound semiconductors. He has published more than 200 scientific papers in semiconductor physics and optoelectronics. His work contributed to: development of molecular beam epitaxy techniques, heterostructure semiconductor materials, and high-speed electronic and photonic devices.

Honors and awards Fellow, Institute of Electrical and Electronics Engineers (2002) Fellow, American Association for the Advancement of Science (2003) MBE Innovator Award (2007)

References

Worked examples

Example 1 — a first encounter with Keh-Yung Cheng

Start with the simplest possible case. Write down what Keh-Yung Cheng claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Keh-Yung Cheng before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Keh-Yung Cheng ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Keh-Yung Cheng

In research: Keh-Yung Cheng appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Keh-Yung Cheng in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Keh-Yung Cheng is common in secondary-school and first-year university syllabi. It links to neighbouring topics Academic staff of Chung Cheng Institute of Technology, National Defense University (Republic of China), Academic staff of the National Tsing Hua University, Alumni of Chung Cheng Institute of Technology, National Defense University, so understanding it makes those chapters shorter.
In everyday life: Look for Keh-Yung Cheng outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Keh-Yung Cheng in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Keh-Yung Cheng means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Keh-Yung Cheng out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Keh-Yung Cheng in simple terms?

Why does Keh-Yung Cheng matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Keh-Yung Cheng?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Keh-Yung Cheng.