Pruning Fruit Trees

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The elements of design knowledge capture

This paper will present the basic constituents of a design knowledge capture effort. This will include a discussion of the types of knowledge to be captured in such an effort and the difference between design knowledge capture and more traditional knowledge base construction. These differences include both knowledge base structure and knowledge acquisition approach. The motivation for establishing a design knowledge capture effort as an integral part of major NASA programs will be outlined, along with the current NASA position on that subject. Finally the approach taken in design knowledge capture for Space Station will be contrasted with that used in the HSTDEK project

HSTDEK: Developing a methodology for construction of large-scale, multi-use knowledge bases

The primary research objectives of the Hubble Space Telescope Design/Engineering Knowledgebase (HSTDEK) are to develop a methodology for constructing and maintaining large scale knowledge bases which can be used to support multiple applications. To insure the validity of its results, this research is being persued in the context of a real world system, the Hubble Space Telescope. The HSTDEK objectives are described in detail. The history and motivation of the project are briefly described. The technical challenges faced by the project are outlined

Third Conference on Artificial Intelligence for Space Applications, part 2

Topics relative to the application of artificial intelligence to space operations are discussed. New technologies for space station automation, design data capture, computer vision, neural nets, automatic programming, and real time applications are discussed

The demand for military expenditure in developing countries

There is a growing body of literature on the determinants of military spending, mostly either starting from the premise of a dyadic arms race, or a welfare maximisation model incorporating economic, political and strategic variables. This thesis takes the latter approach, to analyse a large sample of developing countries for the period 1981-1997. Two cross-section regressions are estimated, one for the Cold War period, one for the post-Cold War, and a panel data model for the whole period. The results of this analysis suggest that military expenditure is roughly proportional to GNP, depends positively on war and the hostile neighbours' milex, and negatively on population and democracy. There is little evidence that the coefficients differ between the two cross-section regressions, but there is strong evidence of a structural break at the end of the Cold War in the panel data results. There is also evidence of regional differences in the results, which suggests that there may be different regional dynamics in the demand for military spending. To investigate further, the South American continent was chosen, and case studies conducted for Argentina, Brazil and Chile for the period 1970-2000. The main strategic influences on milex are hypothesised to be tension between Argentina and Chile and between Peru, Bolivia and Chile, the Falklands war, and Brazil's ambitions as a great power, while national income, debt and inflation are potential economic influences. Another concern is the differing circumstances of democratic transition in the three countries, especially the level of continuing military influence. This is also hypothesised to affect whether the transition led to reduced military spending. To test these hypotheses, ARDL regressions are run for each country. Argentine milex depends positively on GDP, Chilean milex, and post-Falklands rearmament, and negatively on debt and increasing inflation. Brazilian and Chilean milex seem to be independent of GDP, following an upward trend, but both are negatively affected by debt and inflation. There are no significant external influences on Brazilian milex, but some evidence that tension with Argentina affected Chilean milex. Democracy had no effect in Brazil, a clear negative effect in Chile, and a negative effect in Argentina, but only during the Menem administration. Taken overall, the results of the thesis produce a strong and consistent picture that relates the demand for military spending to overall economic resources and to the level of external and internal threat; however, in countries such as Brazil and Chile with strong continuing military influence, an 'institutionalist' understanding may also be needed, with the military seen as a rent-seeking institution

GALAH Survey: Chemically Tagging the Thick Disk

The GALAH survey targets one million stars in the southern hemisphere down to a limiting magnitude of V = 14 at the Anglo- Australian Telescope. The project aims to measure up to 30 elemental abundances and radial velocities (~1 km/s accuracy) for each star at a resolution of R = 28000. These elements fall into 8 independent groups (e.g. alpha, Fe peak, r-process). For all stars, Gaia will provide distances to 1% and transverse velocities to 1 km/s or better, giving us a 14D set of parameters for each star, i.e. 6D phase space and 8D abundance space. There are many scientic applications but here we focus on the prospect of chemically tagging the thick disk and making a direct measurement of how stellar migration evolves with cosmic time.Comment: Barcelona conference (Dec 1-5, 2014): The Milky Way Unravelled by Gaia, eds. Soubiran, Figueras, Walton; 8 page