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2004

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Articles 4441 - 4447 of 4447

Full-Text Articles in Physical Sciences and Mathematics

An Inference Network Approach To Image Retrieval, Donald Metzler, R. Manmatha Dec 2003

An Inference Network Approach To Image Retrieval, Donald Metzler, R. Manmatha

R. Manmatha

Most image retrieval systems only allow a fragment of text or an example image as a query. Most users have more complex information needs that are not easily expressed in either of these forms. This paper proposes a model based on the Inference Network framework from information retrieval that employs a powerful query language that allows structured query operators, term weighting, and the combination of text and images within a query. The model uses non-parametric methods to estimate probabilities within the inference network. Image annotation and retrieval results are reported and compared against other published systems and illustrative structured and …

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Using Maximum Entropy For Automatic Image Annotation, Jiwoon Jeon, R. Manmatha Dec 2003

Using Maximum Entropy For Automatic Image Annotation, Jiwoon Jeon, R. Manmatha

R. Manmatha

In this paper, we propose the use of the Maximum Entropy approach for the task of automatic image annotation. Given labeled training data, Maximum Entropy is a statistical technique which allows one to predict the probability of a label given test data. The techniques allow for relationships between features to be effectively captured and has been successfully applied to a number of language tasks including machine translation. In our case, we view the image annotation task as one where a training data set of images labeled with keywords is provided and we need to automatically label the test images with …

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Vapor Pressures And Vaporization Enthalpies Of The N-Alkanes From C21 To C30 At T ) 298.15 K By Correlation Gas Chromatography, James S. Chickos, William Hanshaw Dec 2003

Vapor Pressures And Vaporization Enthalpies Of The N-Alkanes From C21 To C30 At T ) 298.15 K By Correlation Gas Chromatography, James S. Chickos, William Hanshaw

James Chickos

No abstract provided.

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Synthesis And Characterization Of A Novel 32-Membered Unsymmetrical Dinucleating [N12] Macrocycle: Preparation Of Bimetallic Complexes M2lx2(Clo4)2 (M = Zn, Cd Or Hg; X = Cl, Ncs Or No3), Z. A. Siddiqi Dr, Mohammad Mansoob Khan Dr Dec 2003

Synthesis And Characterization Of A Novel 32-Membered Unsymmetrical Dinucleating [N12] Macrocycle: Preparation Of Bimetallic Complexes M2lx2(Clo4)2 (M = Zn, Cd Or Hg; X = Cl, Ncs Or No3), Z. A. Siddiqi Dr, Mohammad Mansoob Khan Dr

Dr. Mohammad Mansoob Khan

The condensation reaction of N-acetylaniline with 1,3-diaminopropane in 2 : 1 mole ratio under reflux condition generates an intermediate species having C55N bonds. The in situ reaction of the intermediate with HCHO and 1,3-diaminopropane in the presence of perchloric acid results in an off-white solid product. Analytical, FAB mass, IR, 1H NMR and electronic spectral data of this solid are consistent with the formation of the dihydroperchlorate salt of an unsymmetrical 32-membered [N12] macrocycle [L.2HClO4] via a capping mechanism of the intermediate species. Reactions of [L 2HClO4] with Group 12 metal salts, MX2, and their precursors, [M(Ph3P)2Cl2], produce bimetallic complexes …

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Ensuring The Comparability Of Comparison Groups: Is Randomization Enough?, Vance Berger, Sherri Rose Dec 2003

Ensuring The Comparability Of Comparison Groups: Is Randomization Enough?, Vance Berger, Sherri Rose

Sherri Rose

It is widely believed that baseline imbalances in randomized trials must necessarily be random. In fact, there is a type of selection bias that can cause substantial, systematic and reproducible baseline imbalances of prognostic covariates even in properly randomized trials. It is possible, given complete data, to quantify both the susceptibility of a given trial to this type of selection bias and the extent to which selection bias appears to have caused either observable or unobservable baseline imbalances. Yet, in articles reporting on randomized trials, it is uncommon to find either these assessments or the information that would enable a …

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Making Sustainable Development Happen: From Johannesburg To Albany, John C. Dernbach Dec 2003

Making Sustainable Development Happen: From Johannesburg To Albany, John C. Dernbach

John C. Dernbach

No abstract provided.

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Fall Prevention Programs For The Elderly: A Bayesian Secondary Meta-Analysis, Joseph F. Lucke Dec 2003

Fall Prevention Programs For The Elderly: A Bayesian Secondary Meta-Analysis, Joseph F. Lucke

Joseph Lucke

A secondary meta-analysis of programs to reduce falls in the elderly is undertaken to demonstrate a Bayesian analysis. The Bayesian statistical tradition is carefully distinguished from the standard Neyman-Pearson-Wald (NPW) statistical tradition. In the 12 studies, the logit effect size is used to compare treatment groups using a prevention program to control groups without a program. To contrast the Bayesian analysis, independent-effects and fixed-effect meta-analyses are first conducted in the NPW tradition. This is followed by Bayesian independent-effects and fixed-effect meta-analyses that numerically replicate the NPW results but have conceptually different interpretations. The final analyses comprise Bayesian random-effects and predictive …

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