Why is it called Park’s, not Blondel’s, Transformation?

The History of the DQ Transformation

Park’s transformation can be considered to be the single theoretical contribution that triggered the development of advanced design, control, and analysis of electrical machines (motors and generators). To most practicing engineers and researchers in this field, the story goes like this:

Robert H. Park (1902–1994)
André-Eugène Blondel (1863–1938)

After Nikola Tesla invented the AC machine in the 1880s, it took the electrical engineers over 3 decades of struggling with AC circuits analysis before Robert H. Park (1902–1994) published his seminal paper, in 1929, “Two Reaction Theory of Synchronous Machines”. In that paper, the brilliant young engineer solved the problem mathemagically by introducing the dq0-transformation that has been called after him, the Park’s transformation, which transforms the natural 3-phase AC reference frame into a fictitious 2-circuit rotating reference frame.

The Park’s transformation is a brilliant idea indeed, except that it was not invented by Park… Have you ever heard of André-Eugène Blondel (1863–1938)? Here is the complete story.

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Skin in the Game – Nassim Taleb

Couverture de Skin in the Game

  • Title: Skin in the Game – Hidden Asymmetries in Daily Life
  • Author: Nassim N. Taleb
  • Publication Date: 2018
  • Recommendation Score: 5 / 5

Nassim Taleb is a non-conventional thinker. He is a mathematician and cares a lot about rigor and logic. He is a philosopher and cares about the consequences of theory on people’s life. This is reflected in his writings when theory (science) and practice (real life) are intertwined.

“Skin in the Game” is the 5th book in Nassim Taleb’s Incerto series. It deals with asymmetries in daily life (decision-making, risk management, politics, religion, etc.). This post summarizes some of the ideas of the book.

Ethics and Competence

In the introduction, the author focuses on the idea that one cannot disentangle ethics and competence when dealing with human beings. What does it mean that you trust a professional? Do you trust their knowledge and skills? Or their ethics and moral values? Or both?

Some people have skin in the game, such as citizens, merchants, businessmen, entrepreneurs, artisans, etc. Others have no skin in the game such as bureaucrats, administrators, policy wonks, consultants, etc.

No-skin-in-the-game people keep the upside and transfer the downside to others. Skin-in-the-game people, on the other hand, take their own risk and keep their own downside.

Avoid taking advice from someone who gives advice for a living, unless there is a penalty for their advice.

The golden rule vs the silver rule

The golden rule is: Treat others the way you would like them to treat you. The author argues that the following silver rule is more robust: Do not treat others the way you would not like them to treat you.

The Hammurabi code of laws and “skin in the game”

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Agility – Beyond Software Development

The digital technology industry has been moving at a very fast pace over the last decades. Companies that are unable to adapt have been left behind (Nokia, Kodak, etc.). Agility is a key skill for a company to remain competitive.

Since the Agile Manifesto for software development declared in 2001, several software companies have been moving towards this mindset. Some companies went further and adopted the Agile way of development in industries other than software industry.

bobdylan_2275506bIf your time to you is worth saving
Then you better start swimming, or you’ll sink like a stone
For the times they are a-changing.

-Bob Dylan

Is it possible for any company to apply Agile? How about big companies, with complex organizations, top-down policies, rigid processes, over-specialized teams, and other bureaucratic burdens? And above all, what is Agile, and what is not Agile? First, let’s review the life-cycle of a product.

Product life-cycle

A product life-cycle can be broadly divided into 4 phases as shown in the figure below:

Product Life-Cycle

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