astronomy

Henk Zijm

Henk Zijm 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 Henk Zijm rather than just read about it. In short: Willem Hendrik Maria (Henk) Zijm (born 3 May 1952) is a Dutch mathematician, and Professor Production and Supply Chain Management and Emeritus Rector Magnificus (2005–2009) at the University of Twente. Biography Born in Driehuizen, Texel, Zijm received both his BSc in mathematics, physics and astronomy in 1977, and his MSc cum laude in applied mathematics at the University of Amsterdam.

Key takeaways

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

Reference excerpt

Biography Born in Driehuizen, Texel, Zijm received both his BSc in mathematics, physics and astronomy in 1977, and his MSc cum laude in applied mathematics at the University of Amsterdam. In 1982 he received his Phd in operations research at the Eindhoven University of Technology under supervision of Jaap Wessels and Gerhard Willem Veltkamp with a thesis entitled "Nonnegative Matrices in Dynamic Programming." Zijm had started his academic career in 1981 as assistant professor at the Department of Actuarial Sciences and Econometrics of the University of Amsterdam. From 1983 to 1990 he worked in industry at Philips in Eindhoven as consultant in the fields of Operations Research, Logistic Management and Manufacturing Planning and Control. In 1987 he was appointed part-time as professor in mathematical models for operations management at the Eindhoven University of Technology. In 1990 he moved to the University of Twente, where he became professor in production and operations management. Zijm supervised around 150 master students and more than 30 PhD students, among them were Ivo Adan (1991), Geert-Jan van Houtum (1995), Erwin Hans (2001) and Nelly Litvak (2002). From 2000 to 2002, Zijm also directed the Center for Telematics and Information Technology (CTIT). From 2002 to 2004, he chaired the Faculty of Electrical Engineering, Mathematics and Computer Science, and from 2005 to 2009 he was Rector Magnificus of the University of Twente as successor of Frans van Vught. Since 2009, he has been professor in production and supply chain management, and since 2011, director of the Dutch Institute for Advanced Logistics (DINALOG) in Breda. Zijm retired in 2018.

Publications Zijm has authored and co-authored numerous publications. A selection:

Meester, Geatse, and Henk Zijm. "Multi-resource scheduling of an FMC in discrete parts manufacturing." Operations Research Proceedings 1993. Springer Berlin Heidelberg, 1994. 137–137. Zijm, Henk, and Geert-Jan Van Houtum. "On multi-stage production/inventory systems under stochastic demand." International Journal of Production Economics 35.1 (1994): 391–400. Buitenhek, Ronald, Geert‐Jan van Houtum, and Henk Zijm. "AMVA‐based solution procedures for open queueing networks with population constraints." Annals of Operations Research 93.1–4 (2000): 15–40. Zijm, W. Henk, and Zeynep Müge Avşar. "Capacitated two-indenture models for repairable item systems." International Journal of Production Economics 81 (2003): 573–588. Avsar, Zeynep Muge, and W. Henk Zijm. "Capacitated two-echelon inventory models for repairable item systems." Analysis and modeling of manufacturing systems. Springer US, 2003. 1–36.

References

External links [1] at utwente.nl

Illustrations

Worked examples

Example 1 — a first encounter with Henk Zijm

Start with the simplest possible case. Write down what Henk Zijm 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 Henk Zijm 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 Henk Zijm 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 Henk Zijm

In research: Henk Zijm 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 Henk Zijm 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: Henk Zijm is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1952 births, Academic staff of the University of Twente, Dutch mathematicians, so understanding it makes those chapters shorter.
In everyday life: Look for Henk Zijm 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 Henk Zijm in 20 minutes

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

Frequently asked questions

What is Henk Zijm in simple terms?

Willem Hendrik Maria (Henk) Zijm (born 3 May 1952) is a Dutch mathematician, and Professor Production and Supply Chain Management and Emeritus Rector Magnificus (2005–2009) at the University of Twente. Biography Born in Driehuizen, Texel, Zijm received both his BSc in mathematics, physics and astro…

Why does Henk Zijm 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 Henk Zijm?

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 Henk Zijm.