Topic Similarity Networks: Visual Analytics for Large Document Sets

We investigate ways in which to improve the interpretability of LDA topic models by better analyzing and visualizing their outputs. We focus on examining what we refer to as topic similarity networks: graphs in which nodes represent latent topics in text collections and links represent similarity among topics. We describe efficient and effective approaches to both building and labeling such networks. Visualizations of topic models based on these networks are shown to be a powerful means of exploring, characterizing, and summarizing large collections of unstructured text documents. They help to "tease out" non-obvious connections among different sets of documents and provide insights into how topics form larger themes. We demonstrate the efficacy and practicality of these approaches through two case studies: 1) NSF grants for basic research spanning a 14 year period and 2) the entire English portion of Wikipedia.Comment: 9 pages; 2014 IEEE International Conference on Big Data (IEEE BigData 2014

HIV-2 and its neurological manifestations

The human immunodeficiency virus type 2 (HIV-2) produces a similar spectrum of illness as HIV-1, including AIDS, and is clinically indistinguishable. There is evidence that it is less pathogenic, with a longer natural history. HIV2 infection is endemic in West Africa, especially in the former Portuguese and French colonies. Trade, migration, war and tourism have been important factors in the spread of the virus through the subregion and beyond.Diagnostic facilities necessary for the accurate diagnosis of neurological disease are not available in most of Africa and autopsy reports have been few. These constraints have restricted the information available on the pattern of neuropathology induced by HIV-2. However, it possesses neurotropic properties similar to those of HIV-1 and produces disease by means of direct action of the virus on the nervous system, and immunosuppression which allows opportunistic infections and tumours to occur

Partnership research with older people: moving towards making the rhetoric a reality

As nursing develops closer partnerships with older people in delivering care, it also needs to develop partnerships in order to create the knowledge base for practice in a way that challenges professional hegemony and empowers older people. However, the process of developing partnerships in research takes place against a background of academic research traditions and norms, which can present obstacles to collaboration. This paper is a reflection on the issues that have arisen in three projects where older people were involved in research at different levels, from sources of data to independent researchers. It points to some of the areas that need further exploration and development

A numerical approach to robust in-line control of roll forming processes

The quality of roll formed products is known to be highly sensitive and dependent on the process parameters and thus the unavoidable variations of these parameters during mass production. To maintain a constant high product quality, a new roll former with an adjustable final roll forming stand is developed at Deakin University enabling the continuous compensation for possible shape defects. In this work, a numerical approach to robust in-line control of the roll forming of a V-section profile is presented, combining the aspects of robust process design and in-line compensation methods. A numerical study is performed to determine the relationship between controllable process settings and uncontrollable variation of incoming material properties with respect to the common product defects longitudinal bow and springback. The computationally expensive non-linear FE simulations used in this study are subsequently replaced by metamod-els based on efficient Single Response Surfaces. Using these metamodels, the optimal setting for the adjustable stand is determined with robust optimization techniques and the effect on product quality analyzed. It is shown that the subsequent adjustment of the final roll stand position leads to a significantly improved product quality by preventing product defects and minimizing the deteriorating effects of scattering variables

X-ray CT analysis after blast of composite sandwich panels

Four composite sandwich panels with either single density or graded density foam cores and different face-sheet materials were subjected to full-scale underwater blast testing. The panels were subjected to 1kg PE4 charge at a stand-off distance of 1 m. The panel with graded density core and carbon fiber face-sheets had the lowest deflection. Post-blast damage assessment was carried out using X-ray CT scanning. The damage assessment revealed that there is a trade-off between reduced panel deflection and panel damage. This research has been performed as part of a program sponsored by the Office of Naval Research (ONR)

Doppler Tomography of Dwarf Nova IY UMa during Quiescence

Quiescent Doppler tomography of the newly discovered deeply-eclipsing SU UMa system IY UMa reveals properties of the region where the accretion stream from the donor impacts the edge of the disc. A very strong bright spot is produced and the Keplerian disc emission in the impact region is disrupted or obscured. The differing properties of Halpha, Hbeta and He I emission will allow physical parameters of the converging flow region to be studied.Comment: 6 pages, 5 figures. To appear in Proceedings of Astro-Tomography Workshop, Brussels, July 2000, Eds. H. Boffin, D. Steeghs, Springer-Verlag Lecture Notes in Physic

Peer verbal sexual harassment in early adolescence: a feminist and sexual scripts theoretical approach.

Until recently, sexual harassment research has focused primarily on adults and college and high school students with little attention given to younger students. While recent research has noted sexual harassment occurs among younger students, the literature addressing sexual harassment among middle school students is still sparse. Additionally, most studies of sexual harassment have focused on sexual harassment generally, with no distinction made between verbal and sexual harassment. In fact, only limited research has been exclusively conducted on verbal sexual harassment. Using self-report data, the current study adds to the literature by examining the nature of verbal sexual harassment as well as selected characteristics of the victims of sexual harassment through the lens of Gender Order Theory and Social Script Theory. Additionally, this study seeks to assess the effectiveness of one school-based violence reduction program, Shifting Boundaries, as implemented among 6th and 7th graders in 30 middle schools in the New York City School System in 2009-2010. The findings suggest that boys are the primary perpetrator of verbal sexual harassment against both genders, and the sexual harassment program was not overly effective in reducing perpetration and victimization among this population. Additional findings, limitations, and policy implications are discussed

Another collateral consequence? : examining homeless shelters policies on sex offenders across four states.

The primary focus throughout the literature regarding sex offenders has been on the efficacy and collateral damage of sex offender laws such as Sex Offender Registration and Notification (SORN) and residency restrictions. However, there is a lack in scholarship regarding transient sex offenders. The current research examines homeless shelter’s policies on permitting sex offenders to use their services in Michigan, Ohio, Kentucky and Tennessee. Previous research has found that sex offenders face reoccurring obstacles throughout the reintegration process, which has affected their ability to find suitable housing, employment and social support. The author explored homeless shelters’ policies and whether or not homeless shelters are furthering collateral damage for sex offenders. The findings suggest that homeless shelters sex offender policies do create another collateral consequence for them. Therefore, sex offenders being denied shelter not only keeps them onto the streets, but also creates a public safety issue

The effect of deuteration on organic magnetoresistance

NOTICE: this is the author’s version of a work that was accepted for publication in Synthetic Metals. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in SYNTHETIC METALS, 161, 7-8, (2011) DOI 10.1016/j.synthmet.2010.11.04