Segmentation ART: A Neural Network for Word Recognition from Continuous Speech

The Segmentation ATIT (Adaptive Resonance Theory) network for word recognition from a continuous speech stream is introduced. An input sequeuce represents phonemes detected at a preproccesing stage. Segmentation ATIT is trained rapidly, and uses a fast-learning fuzzy ART modules, top-down expectation, and a spatial representation of temporal order. The network performs on-line identification of word boundaries, correcting an initial hypothesis if subsequent phonemes are incompatible with a previous partition. Simulations show that the system's segmentation perfonnance is comparable to that of TRACE, and the ability to segment a number of difficult phrases is also demonstrated.National Science Foundation (NSF-IRI-94-01659); Office of Naval Research (N00014-95-1-0409, N00014-95-1-0G57

Large temporal variations of energetic electron intensities at mid-latitudes in the outer radiation zone Progress report

Variations of electron flux density observations by Explorer 12 and 1

The Delimitation and Coherence of Functional and Administrative Regions

The aim of this paper is to examine the coherence between and within functional as well as administrative regions in a labour market context. The larger the coherence of the local labour markets within the delimited regions, the larger the heterogeneity between the delimited regions is expected to be for particular measures related to the economy and the labour market. Contrary to previous delimitation studies we test for labour market coherence. The functionally defined regions are compared with the administratively defined regions with respect to four economic indicators: (i) income level; (ii) housing prices; (iii) employment rate, and (iv) unemployment rate. It turns out that the administrative delimitation of the Netherlands performs, on average, equally well as the functional delimitation. The hypothesis that the municipalities within the administratively defined regions show less coherence than the municipalities within the functionally delimited regions, cannot be rejected. We find some minor evidence that the coherence is greater for the average income level of municipalities within functional regions than within administrative regions. It can be concluded that there is not much to be gained in labour market policies by using functional instead of administrative divisions of regional labour markets. Therefore we doubt the usefulness of other studies on functional delimitations of labour market regions. Finally, our results imply that it may be better for regional labour market policies not to use a highly differentiated division of regions for such a small country as the Netherlands.education, training and the labour market;

The Determinants of High School Closures: Lessons from Longitudinal Data throughout Illinois

Facing substantial financial pressure, many districts close schools in order to preserve solvency and improve student outcomes. Using a new longitudinal data set on all non-Cook County Illinois schools, we examine the determinants of high school closure decisions from 1991 through 2005. Our dataset combines information from a wide variety of sources, including the Illinois State Board of Education, the Census Bureau, the Illinois Department of Revenue, and the Bureau of Labor Statistics. Prior studies in this area typically use cross-sectional data, short panels, or case-studies. Schools that close have lower enrollments, are located in more rural areas, and have higher per-pupil expenditures. Enrollments and fiscal resources are indeed the most important determinants of school closures. Neither math and reading test scores nor the sociodemographics of the students have a significant impact on high school closure decisions.economics of education, education finance, human capital, secondary education

A Survey of Metal Lines at High-redshift (I) : SDSS Absorption Line Studies - The Methodology and First Search Results for OVI

We report the results of a systematic search for signatures of metal lines in quasar spectra of the Sloan Digital Sky Survey (SDSS) Data Release 3(DR3), focusing on finding intervening absorbers via detection of their OVI doublet. Here we present the search algorithm, and criteria for distinguishing candidates from spurious Lyman $\alpha${} forest lines. In addition, we compare our findings with simulations of the Lyman $\alpha${} forest in order to estimate the detectability of OVI doublets over various redshift intervals. We have obtained a sample of 1756 OVI doublet candidates with rest-frame equivalent width > 0.05 \AA{} in 855 AGN spectra (out of 3702 objects with redshifts in the accessible range for OVI detection). This sample is further subdivided into 3 groups according to the likelihood of being real and the potential for follow-up observation of the candidate. The group with the cleanest and most secure candidates is comprised of 145 candidates. 69 of these reside at a velocity separation > 5000 km/s from the QSO, and can therefore be classified tentatively as intervening absorbers. Most of these absorbers have not been picked up by earlier, automated QSO absorption line detection algorithms. This sample increases the number of known OVI absorbers at redshifts beyond z$_{abs} > 2.7 substantially.Comment: 41 pages, 10 figures, 2 tables, accepted by AJ. This is a substantially altered version, including an appendix with details on the validity of the search algorithm on one pixel rather than binning. Also note that M. Pieri was added as autho

The POOL Data Storage, Cache and Conversion Mechanism

The POOL data storage mechanism is intended to satisfy the needs of the LHC experiments to store and analyze the data from the detector response of particle collisions at the LHC proton-proton collider. Both the data rate and the data volumes will largely differ from the past experience. The POOL data storage mechanism is intended to be able to cope with the experiment's requirements applying a flexible multi technology data persistency mechanism. The developed technology independent approach is flexible enough to adopt new technologies, take advantage of existing schema evolution mechanisms and allows users to access data in a technology independent way. The framework consists of several components, which can be individually adopted and integrated into existing experiment frameworks.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 5 pages, PDF, 6 figures. PSN MOKT00