computer science

Roch Guérin

Roch Guérin 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 Roch Guérin rather than just read about it. In short: Roch Guérin is a French computer scientist. He is the Harold B. & Adelaide G.

Key takeaways

Roch Guérin 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 Roch Guérin to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Roch Guérin from memory before moving on to harder problems.

Reference excerpt

Roch Guérin is a French computer scientist. He is the Harold B. & Adelaide G. Welge Professor of Computer Science at the McKelvey School of Engineering at Washington University in St. Louis, and chair of the Computer Science & Engineering department at that university. Prior to that he was the Alfred Fitler Moore Professor of Telecommunications Networks and professor of electrical and systems engineering and computer and information science at the University of Pennsylvania. He worked for 12 years at the IBM Thomas J. Watson Research Center. Obtaining his BS from École nationale supérieure des telecommunications, he received his MS in 1984 and PhD in 1986 from the California Institute of Technology. His research centers on computer networks, cloud computing, performance analysis, and network economics. He is a Fellow of the ACM and IEEE for contributions to the theory and practice of quality-of-service guarantees in packet networks, and the development and application of the equivalent bandwidth concept.

Selected research Yavatkar, Raj, Dimitrios Pendarakis, and Roch Guerin. "A framework for policy-based admission control." (2000). Apostolopoulos, George, et al. QoS routing mechanisms and OSPF extensions. Vol. 999. RFC 2676, August, 1999. Guerin, Roch A., and Ariel Orda. "QoS routing in networks with inaccurate information: theory and algorithms." IEEE/ACM transactions on Networking 7.3 (1999): 350-364. Guerin, Roch, Hamid Ahmadi, and Mahmoud Naghshineh. "Equivalent capacity and its application to bandwidth allocation in high-speed networks." IEEE Journal on selected areas in communications 9.7 (1991): 968-981.

References

Worked examples

Example 1 — a first encounter with Roch Guérin

Start with the simplest possible case. Write down what Roch Guérin 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 Roch Guérin 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 Roch Guérin 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 Roch Guérin

In research: Roch Guérin 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 Roch Guérin 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: Roch Guérin is common in secondary-school and first-year university syllabi. It links to neighbouring topics California Institute of Technology alumni, Computer networking people, ENSTA Paris alumni, so understanding it makes those chapters shorter.
In everyday life: Look for Roch Guérin 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 Roch Guérin in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Roch Guérin 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 Roch Guérin out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Roch Guérin in simple terms?

Roch Guérin is a French computer scientist. He is the Harold B. & Adelaide G.

Why does Roch Guérin 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 Roch Guérin?

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 Roch Guérin.