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07 Jan 09

NEW PAPYRUS: Mining the Moons of Mars

  • if emerging technologies designed to extract uranium from seawater come into fruition then there could be enough marine uranium resources to power all of human civilization for over 3000 years-- even without the reprocessing of spent fuel or the use of breeding technologies.
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18 Sep 08

Can we standardize version control?

  • I would love to see a standard version query language and table structure that allowed you to run any query you wanted through the version control system’s engine.  You might be able to write queries like the following (pseudo-queries only):


    Who wrote the code at a specific location in a source code file?

    select author where file = “x” and line = y

    where x is the file and y is the file line number.


    Across all files, which version’s check in comments contain a specific string pattern?

    select revision_number, file where comment like “x”

    where x is the check in comment to look for.


    What check ins has a particular person made in the last 10 days?

    select file, revision_number where author = “x” and checkin_date >= y

    where x is the user and y is the date 10 days ago.


    Which check ins had the biggest effect on a particular file?

    select top 5 revision_number where file = “x” order by lines_changed desc

    where x is the file.

07 Sep 08

Isoperimetric Polygons of Maximum Width

  • The value
    $\frac{1}{2n}\cot(\frac{\pi}{2n})$
    is shown to be an upper bound on the width of any n-sided polygon with unit perimeter. This bound is reached when n is not a power of 2, and the corresponding optimal solutions are the regular polygons when n is odd and clipped regular Reuleaux polygons when n is even but not a power of 2.

[0806.4749] Nested Ordered Sets and their Use for Data Modelling

  • In this paper we present a new approach to data modelling, called the
    concept-oriented model (CoM), and describe its main features and
    characteristics including data semantics and operations. The distinguishing
    feature of this model is that it is based on the formalism of nested ordered
    sets where any element participates in two structures simultaneously:
    hierarchical (nested) and multi-dimensional (ordered). An element of the model
    is postulated to consist of two parts, called identity and entity, and the
    whole approach can be naturally broken into two branches: identity modelling
    and entity modelling. We also propose a new query language with the main
    construct, called concept, defined as a pair of two classes: identity class and
    entity class. We describe how its operations of projection, de-projection and
    product can be used to solve typical data modelling tasks.
28 May 08

Ontology of Folksonomy

  • Ontologies are enabling technology for the Semantic
    Web.  They are a means for people to state what they mean by the terms
    used in data that they might generate, share, or consume.  Folksonomies
    are an emergent phenomenon of the Social Web. They arise from data about how
    people associate terms with content that they generate, share, or
    consume.  Recently the two ideas have been put into opposition, as if they
    were right and left poles of a political spectrum.  This is a false
    dichotomy; they are more like apples and oranges. In fact, as the Semantic Web
    matures and the Social Web grows, there is increasing value in applying
    Semantic Web technologies to the data of the Social Web. This article is an
    attempt to clarify the distinct roles for ontologies and folksonomies, and
    previews some new work that applies the two ideas together - an ontology of
    folksonomy.
22 May 08

The Influence of Children on Their Parents’ Values

  • Many parents report that their values are influenced by their children. However, few studies provide direct evidence regarding child–parent value transmission. We review this evidence and propose five main processes of child influence: (i) Passive child influences, causing change in parental values by the mere presence or development of children; (ii) Active child influences, due to children directly attempting to influence their parents’ opinions or providing parents with relevant information; (iii) Differentiation, the emergence of a distinction between parents’ own personal values and their socialization values; (iv) Reciprocal influences; in which parents’ and children’ influences are intertwined; and (v) Counter-influences, in which parental values change in a direction opposite to that of children's values. A study on child influence illustrates some of these processes. The roles of migration, aging, and parent and child characteristics in child-to-parent influences are discussed.
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