Two bracketing schemes for the Penn Treebank

The trees in the Penn Treebank have a standard representation that involves complete balanced bracketing. In this article, an alternative for this standard representation of the tree bank is proposed. The proposed representation for the trees is loss-less, but it reduces the total number of brackets by 28%. This is possible by omitting the redundant pairs of special brackets that encode initial and final embedding, using a technique proposed by Krauwer and des Tombe (1981). In terms of the paired brackets, the maximum nesting depth in sentences decreases by 78%. The 99.9% coverage is achieved with only five non-top levels of paired brackets. The observed shallowness of the reduced bracketing suggests that finite-state based methods for parsing and searching could be a feasible option for tree bank processing.

ISO 13567 - The Proposed International Standard for Structuring Layers in Computer Aided Building Design

Layering is a widely used method for structuring data in CAD-models. During the last few years national standardisation organisations, professional associations, user groups for particular CAD-systems, individual companies etc. have issued numerous standards and guidelines for the naming and structuring of layers in building design. In order to increase the integration of CAD data in the industry as a whole ISO recently decided to define an international standard for layer usage. The resulting standard proposal, ISO 13567, is a rather complex framework standard which strives to be more of a union than the least common denominator of the capabilities of existing guidelines. A number of principles have been followed in the design of the proposal. The first one is the separation of the conceptual organisation of information (semantics) from the way this information is coded (syntax). The second one is orthogonality - the fact that many ways of classifying information are independent of each other and can be applied in combinations. The third overriding principle is the reuse of existing national or international standards whenever appropriate. The fourth principle allows users to apply well-defined subsets of the overall superset of possible layernames. This article describes the semantic organisation of the standard proposal as well as its default syntax. Important information categories deal with the party responsible for the information, the type of building element shown, whether a layer contains the direct graphical description of a building part or additional information needed in an output drawing etc. Non-mandatory information categories facilitate the structuring of information in rebuilding projects, use of layers for spatial grouping in large multi-storey projects, and storing multiple representations intended for different drawing scales in the same model. Pilot testing of ISO 13567 is currently being carried out in a number of countries which have been involved in the definition of the standard. In the article two implementations, which have been carried out independently in Sweden and Finland, are described. The article concludes with a discussion of the benefits and possible drawbacks of the standard. Incremental development within the industry, (where ”best practice” can become ”common practice” via a standard such as ISO 13567), is contrasted with the more idealistic scenario of building product models. The relationship between CAD-layering, document management product modelling and building element classification is also discussed.

Galilein ja Miltonin ihmeellinen tapaaminen

Tarkastelun kohteena on Galileo Galilein ja John Miltonin tapaaminen 1638 sekä Galilein inkvisitio-oikeudenkäynnin vaikutus John Miltonin käsitykseen sananvapaudesta. Artikkelia on täydennetty 2009.

Strömungen in der mexikanischen Musik

A short article summarizing the most visible streams of Mexican music along the last century. Special attention is paid to the intellectual and idiosyncratic components which are considered as elements of authenticity in Mexican culture.

Il canto sospeso de Luigi Nono

This article explains how Nono's Il canto sospeso (1956), for solo voices, choir and orchestra, is structured in a logic of counterbalances for each musical action, overlapping a harmonic or ‘intuitive’ geometry, with a contrasting or ‘anti-intuitive’ plot. Unlike the typical relationships with the golden ratio, found in many musical examples in which it appears ‘naturally’ (see Tatlow 2001), intervals in the prime numbers series here are perceived as ‘counter-rhythm’; as a form of a counterintuitive distribution, or, as Jameson (2003:vii) suggests, as “a very irregular way” of apparent distribution.

El Motezuma de Vivaldi

This article explores aesthetic and historical aspects of Antonio Vivaldi's (1678- 1741) Motezuma (1733), in three acts, to celebrate this opera revival after the score's discovery and its first premiere at De Doelen theatre, Rotterdam (2005). Particular attention is paid to cultural aspects, regarding the European interpretation of the Conquest of Mexico.

La música en la fiesta del dios Xipe Totec

In Aztec mythology and religion, Xipe Totec ("our lord the flayed one") was a life-death-rebirth deity, god of agriculture, vegetation, the east, disease, spring, goldsmiths, silversmiths and the seasons. The music used for his worship has been described by a diversity of documents (carved stones, depicted codices, and chronicles made by the first European friars arrived to Mexico). This article explores the symbolic content of these descriptions, especially in association with Xochipilli Macuilxochitl, master of music and poetry.

El teponaztli en la tradición musical mexica

Lecture about the teponaztli (a specific type of slit drum), traditionally used by the Aztec (or Mexica) people, and its associated repertoire. Special attention is paid to the usage of this instrument in the Cantares Mexicanos (a song compilation from the 16th century) accompaniment.