Archive for the 'science technology' Category

Jul 10 2007

A Spark of Hope for the Environment

Published by Forager under science technology

Just read the news that the condition in Aral Sea is improving. I read the story of Aral Sea several years ago and it was the first time environmental degradation became tangible/shocking/scary to me.

Some of the facts are well-known by now. In short, Aral Sea was once the fourth largest inland water body in the world. Because human ignorance (abusive agricultural practice), it has lost half of the size or 3/4 of the volume. In the process, many fish in the lake went extinct and the population suffered from many diseases as a result of deterioriating water and air condition–in fact I now remember I saw the story at Doctors Without Border’s website. I remember vividly the picture that caught my eye was a fishing boat–clearly in working condition–resting on top of a sand dune like a ghost.

The good news is that today, after years of human effort, the condition is improving.

I am also excited at this news because a rejuvenated Aral Sea may help to reduce the Asian Sand Storm that has been a fixture of Beijing since the 1990s.

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Apr 17 2007

Language, Structure, Information, Knowledge

All of sudden, I have heard so much about an ongoing academic debate: a linguistic professor is challenging whether Chomsky’s tree is really that universal in all languages.

I first heard of Dan Everett on a Sunday morning when I forgot to turn off the alarm clock set for the day before. NPR’s weekend edition has a nice piece of how an Amazonian tribe “converted” a missionary into an atheist professor and inspired him to challenge Chomsky.

I was a dirt poor immigrant student struggling with libido, money, grades and finding a job when I first learned the Chomsky’s theory in my Compiler class. I almost failed the class. It was not until all those temporal issues were settled did I realize what I had missed: one day I hit an epiphany and became a convert. I even bought his political arguments (the return on that was much lower though).

Hearing someone challenging Chomsky was enough to keep me awake on a gray Seattle weekend morning. I did some research on the topic but couldn’t understand all the original documents flying back and forth among Everett and his challengers.

A day later came the Apr 17th issue of the New Yorker that has a featured article (c) about this very topic. It made things much easier for me to understand but I guess I am still missing the part I don’t understand.

As described by the NYKR article, the central question is whether recursion is part of the “universal grammer” that is innate to human beings. Chomsky thinks that vocal communication is not unique to human, but recursion is. It seems so far, all the languages in history has bore him out until Dan Everett met the Piraha tribe in the Amazon jungle.

What Everett, a gifted linguistic expert and a former Evangelical missionary, found is that:
1. The Piraha tribe is a capable people: they have a history, a body of knowledge that enable them to survive in nature and, most importantly, they seem to have fostered a tradition or a culture–not in the forms of dances or rituals but in how they think. For example, they don’t trust outsiders and are resistant to outside influences.
2. Yet their language seems to be extremely primitive: it does not have words for directions or numbers.

The whole affair is enormously fascinating. I have so many questions that I don’t even know where to start. For example, Everett seems to suggest that the Pirahas do not use, nor do they understand, abstraction: they have to deal with something concrete and immediate. For example, a boy can build a model airplane but only when there is a real one in front of him. Instead of using directional words, they use physical landmarks (e.g. turn to the river). What I don’t understand is, if this is true, how can they pass knowledge around? How does a father tell his son how to evade a jaguar? Does he have to do so in front of a live one?

Other questions include: is Everett’s discovery really enough to unset Chomsky’s universe? Or maybe the Piraha case is an exception of the close coupling of culture and language?

More importantly, is there a parallel between language structure and knowledge structure? Theoretically speaking, if a body of knowledge can be described by a langugae, the knowledge should conform to the Chomsky normal form as well. For example, let’s say how to work with a spreadsheet is a body of knowledge, then there a tree-like form that encompasses all the necessary information (e.g. feature list) and sub-knowledge (e.g. what is a spreadsheet). Interestingly enough, a business guru, Barbara Minto, advices businessmen to use a “pyramid structure” to carry out effective communications (i.e. to convey/exchange a body of knowledge).

This kind of link back to what I have always thought as the “meta-concept” in a language. To put it simply, a meta-concept is an abstraction of a collection of lower level concepts until one hits physical senses. For example, the colors red, green, blue are concepts derived from physical senses and the concept/word “color” is an abstraction of all visible colors. Color, texture and rigidity may be further abstracted as the concept of “attribute” (of an object)… and so on.

My argument is, the more high level meta-concepts a language espouses, the more powerful the language is (e.g. more capable of delivering complex concepts). This is perhaps too self-explanatory to make a difference. However, that is exactly why the Piraha case is so strange. Something is not quite right here: either humans can survive with limited language ability or the whole language-knowledge relationship is wrong: e.g. the Pirahas can use limited vocabulary and recursion-less structure to express complex meanings. Either way, it doesn’t make a whole lot sense.

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Apr 12 2007

Nature dominates Nurture

Published by Forager under science technology

Read a pretty interesting article: Pas de Deux of Sexuality Is Written in the Genes

Couple of days ago, I wrote about how politics, as a social behavior, could be driven by physical desire and is not confined in human only. This article seems to have just de-constructed the mystical emotion called love. The article seems pretty banal but that is because from scientists’ view, love itself is pretty banal.

Not much to add, just to say it confirms many things I kind of suspected/assumed/accepted: too much of man is writte0n in his genes. The irony is, if one wants to overcome any genetic deficiency and succeeds, it is probably because one has a “perseverance gene”. So much for the much philosophized “free will“.

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