University of Rhode Island

About: University of Rhode Island is a education organization based out in Kingston, Rhode Island, United States. It is known for research contribution in the topics: Population & Bay. The organization has 11464 authors who have published 22770 publications receiving 841066 citations. The organization is also known as: URI & Rhode Island College of Agriculture and the Mechanic Arts.

Toward Optimal Feature Selection in Naive Bayes for Text Categorization

Abstract: Automated feature selection is important for text categorization to reduce the feature size and to speed up the learning process of classifiers. In this paper, we present a novel and efficient feature selection framework based on the Information Theory, which aims to rank the features with their discriminative capacity for classification. We first revisit two information measures: Kullback-Leibler divergence and Jeffreys divergence for binary hypothesis testing, and analyze their asymptotic properties relating to type I and type II errors of a Bayesian classifier. We then introduce a new divergence measure, called Jeffreys-Multi-Hypothesis (JMH) divergence, to measure multi-distribution divergence for multi-class classification. Based on the JMH-divergence, we develop two efficient feature selection methods, termed maximum discrimination ($MD$) and $MD-\chi^2$ methods, for text categorization. The promising results of extensive experiments demonstrate the effectiveness of the proposed approaches.

Activating Tasks for the Study of Visual-Spatial Attention in ADHD Children: A Cognitive Anatomic Approach:

Abstract: The clinical label attention deficit hyperactivity disorder (ADHD) suggests that this syndrome is a disorder of attention. However, the presumed attentional deficits have not been linked either to specific cognitive operations or to specific neural systems. To provide this link, theories of the cognitive anatomy of attention were used to generate hypotheses about specific visual-spatial attentional deficits in children with ADHD. A cued reaction-time test was used to assess covert and overt shifts of attention theoretically linked to two neuroanatomically defined attentional systems in the posterior and anterior parts of the human brain. The early, posterior-based covert shift of attention was found to be normal in ADHD children, but a later, anterior-based overt shift of attention was abnormal as reflected by a significant lateral difference in reaction time. This was interpreted as a failure to sustain focused attention.

Critical reflective inquiry for knowledge development in nursing practice

Abstract: This paper presents a method of inquiry which uses nurses' situated, individual instances of nursing practice as the basis for developing knowledge for nursing and improving practice. This method of inquiry is founded upon the ideas in action science and reflective practice, and critical philosophy. Nursing practice is viewed as a rich source of new knowledge as practitioners are engaged in creating as well as modifying knowledge to respond to specific clinical situations. At the same time, practitioners may be in practice without recognizing deficiencies or ineffectiveness. As a method to tap these two aspects of practice, the inquiry is designed to encompass three phases, i.e. descriptive, reflective and critical/emancipatory, and is oriented to provide understanding to practitioners of the nature and meaning of their own practice, to correct and improve practice through self-reflection and critique, and to generate models of 'good' practice and theories of application as well as to discover processes of practice as played out in clinical situations. This method of inquiry can be used by nurses and nursing students in collaboration with researches or mentors to develop nursing knowledge about practice, improve individual practice, and engage in shared learning.