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This paper suggests that online collaborative environments like Knowledge Forum provide an important arena for students to exercise their ability to formulate reflective ideas. A discourse analysis of three primary 4 classes’ verbal and written activities during a two-week science unit showed that, during online activities there was a significant increase in the number of words students used to...

The Poisson disorder problem seeks to determine a stopping time which is as close as possible to the (unknown) time of ’disorder’ when the intensity of an observed Poisson process changes from one value to another. Partial answers to this question are known to date only in some special cases, and the main purpose of the present paper is to describe the structure of the solution in the general c...

In this poster we present preliminary findings of an exploratory study of natural language music information queries posted to the Google Answers web site. We discuss the proportion of queries answered as a function of time and attempt to identify factors which affect the probability of a query being answered.

tart with ordinary Euclidean space. Be a realist about points, and about S distances between points. I ask: how are the points interwoven to form the fabric of space? Are there direct ties only between “neighboring points,” so that points at a distance are connected only indirectly through series of such direct ties? Or are there also direct ties between distant points, so that the fabric is re...

Answering questions that ask about temporal information involves several forms of inference. In order to develop question answering capabilities that benefit from temporal inference, we believe that a large corpus of questions and answers that are discovered based on temporal information should be available. This paper describes our methodology for creating AnswerTime-Bank, a large corpus of qu...

Explaining why an answer is present (traditional provenance) or absent (why-not provenance) from a query result is important for many use cases. Most existing approaches for positive queries use the existence (or absence) of input data to explain a (missing) answer. However, for realistically-sized databases, these explanations can be very large and, thus, may not be very helpful to a user. In ...

1 Bauld L, Day P, Judge K. Off target: a critical review of setting goals for reducing health inequalities in the United Kingdom. Int J Health Serv 2008; 39: 439–54. 2 Murray CJL. Eight Americas: investigating mortality disparities across races, counties, and race-counties in the United States. PloS Med 2006; 3: e260. 3 Irvine L, Elliott L, Wallace H, Crombie IK. A review of major infl uences o...