Article

Application survey - planning.

January 1980

Authors:

This paper surveys the application of geographic-based systems in Urban and Regional planning. A discussion on the nature and requirements of the planning process is followed by a review of significant implementation and research. The growth of applications in this area has not been as marked as elsewhere. Reasons for this are proposed, and the implications for system design are considered. Emphasis throughout is upon the vast data requirements of planning, coupled with the need to consider their distribution both over time and space. -AuthorIBM UK Scientific Center, Athelstan House, St.Clement Street, Winchester.

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Study and analysis of the reasons for the lack of competitiveness of portuguese construction industr...

January 2006

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Article

A Simple Prediction of the Surface Density of Galaxies at z 6

December 2008 · The Astrophysical Journal

Systematic surveys are being proposed to discover a significant number of galaxies at z 6, which is now suggested as the epoch at which the reionization era of the universe ends. To plan such surveys, we need a reasonable expectation of the surface density of high-redshift galaxies at different flux limits. Here we present a simple prediction of the surface density of 5.5 ≤ z ≤ 6.5 galaxies in ... [Show full abstract] the optical regime, extrapolating from what is already known about galaxies at z 3. This prediction is consistent with the results of nearly all known searches for objects at z 6, giving confidence that we may use it to plan optimal combination of survey depth and sky coverage in searching for such objects. We suggest that the most efficient strategy with existing ground-based facilities is to do medium-depth (mAB 24.0-24.5 mag), wide-field (a couple of square degrees) survey using a wide-field camera at a 4 m class telescope. As the predicted surface density at this brightness level is very sensitive to the value of L*, the result of such a survey can be easily used to constrain the luminosity evolution from z 3 to 6.

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May 2006 · Risk Analysis

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Article

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January 1992

For risk assessments, the average current residence time (time since moving into current residence) has often been used as a surrogate for the average total residence time (time between moving into and out of a residence). Since the distributions of the two quantities are not necessarily the same, neither are their averages. Housing surveys provide current residence time data; total residence ... [Show full abstract] times must, therefore, be inferred. By modeling the moving process, the total residence time distribution can be estimated from current residence time data. Using 1985 and 1987 U.S. housing survey data, distributions and averages for both current and total residence times were calculated for several housing categories. The average total residence time calculated for all U.S. households, 4.6 (se = 0.6) years, is less than half the average current residence time, 10.6 (se = 0.1) years.

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Full-text available

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October 2015

Heribert Engstler

Based on data of the German Ageing Survey and other surveys we investigate trends and factors of post-retirment employment in Germany. Our results show that post-retirement work of individuals aged 60 and older has increased during the period 1996-2011. Regarding the factors which explain post-retirement employment we find that although financial factors are important in determining employment ... [Show full abstract] participation, other factors like household context or employment biographic factors play an important role. Last, the analysis of the self reported reasons for employment reveal that financial necessity is not the main reason to work beyond retirement.

Technical Report

Full-text available

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December 1986

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This paper studies how long US residents stay in their homes. Owners stay in their homes a median of 20-30 years. Renters stay a median of 3-4 years. Estimates are based on three methods. Two can be done in a single survey, One uses two successive surveys at the same housing units.

Article

Life-cycle changes in household structure and travel characteristics ( Reading).

January 1980

J.D. Downes

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Conference Paper

Progress on Crossing Number Problems

January 2005 · Lecture Notes in Computer Science

László A. Székely

Crossing numbers have drawn much attention in the last couple of years and several surveys [22], [28], [33], problem collections [26], [27], and bibliographies [40] have been published. The present survey tries to give pointers to some of the most significant recent developments and identifies computational challenges.