computer science

Ralph Johnson (computer scientist)

Ralph Johnson (computer scientist) is a computer science 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 Ralph Johnson (computer scientist) rather than just read about it. In short: Ralph E. Johnson is a Research Associate Professor in the Department of Computer Science at the University of Illinois at Urbana-Champaign.

Key takeaways

Ralph Johnson (computer scientist) belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ralph Johnson (computer scientist) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ralph Johnson (computer scientist) from memory before moving on to harder problems.

Reference excerpt

Ralph E. Johnson is a Research Associate Professor in the Department of Computer Science at the University of Illinois at Urbana-Champaign. He is a co-author of the influential computer science textbook Design Patterns: Elements of Reusable Object-Oriented Software, for which he won the 2010 ACM SIGSOFT Outstanding Research Award. In 2006 he was awarded the Dahl–Nygaard Prize for his contributions to the state of the art embodied in that book as well. Johnson was an early pioneer in the Smalltalk community and is a continued supporter of the language. He has held several executive roles at the ACM Object-Oriented Programming, Systems, Languages and Applications conference OOPSLA. He initiated the popular OOPSLA Design Fest workshop.

References

External links Ralph Johnson's blog Ralph E. Johnson at UIUC Interview with Ralph Johnson from OOPSLA 2009, discussing Parallel Programming Patterns Presentation on a Pattern Language for Parallel Programming from QCon London 2010

Worked examples

Example 1 — a first encounter with Ralph Johnson (computer scientist)

Start with the simplest possible case. Write down what Ralph Johnson (computer scientist) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, 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 Ralph Johnson (computer scientist) 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 Ralph Johnson (computer scientist) 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 Ralph Johnson (computer scientist)

In research: Ralph Johnson (computer scientist) appears in computer science 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 Ralph Johnson (computer scientist) 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: Ralph Johnson (computer scientist) is common in secondary-school and first-year university syllabi. It links to neighbouring topics American computer scientists, Computer specialist stubs, Dahl–Nygaard Prize, so understanding it makes those chapters shorter.
In everyday life: Look for Ralph Johnson (computer scientist) 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 Ralph Johnson (computer scientist) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ralph Johnson (computer scientist) 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 Ralph Johnson (computer scientist) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ralph Johnson (computer scientist) in simple terms?

Ralph E. Johnson is a Research Associate Professor in the Department of Computer Science at the University of Illinois at Urbana-Champaign.

Why does Ralph Johnson (computer scientist) matter?

Because it connects several computer science 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 Ralph Johnson (computer scientist)?

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 Ralph Johnson (computer scientist).