University of Waterloo

About: University of Waterloo is a education organization based out in Waterloo, Ontario, Canada. It is known for research contribution in the topics: Population & Context (language use). The organization has 36093 authors who have published 93906 publications receiving 2948139 citations. The organization is also known as: UW & uwaterloo.

Audience engagement in multimedia presentations

Abstract: Engagement in training and educational presentations facilitates learning. This paper describes engagement and proposes that it is conceptually similar to the state of playfulness, a construct increasingly applied to studies of human-computer interactions. It then describes how multimedia technologies can influence listeners' engagement during presentations. Results from pilot and main studies suggest that students' engagement in multimedia presentations can be increased by developing presentations that provide more challenge, feedback, presenter control, and variety. The paper concludes by discussing implications for research and practice.

Securing smart grid: cyber attacks, countermeasures, and challenges

Abstract: Smart grid has emerged as the next-generation power grid via the convergence of power system engineering and information and communication technology. In this article, we describe smart grid goals and tactics, and present a threelayer smart grid network architecture. Following a brief discussion about major challenges in smart grid development, we elaborate on smart grid cyber security issues. We define a taxonomy of basic cyber attacks, upon which sophisticated attack behaviors may be built. We then introduce fundamental security techniques, whose integration is essential for achieving full protection against existing and future sophisticated security attacks. By discussing some interesting open problems, we finally expect to trigger more research efforts in this emerging area.

How far ahead do we look when required to step on specific locations in the travel path during locomotion

Abstract: Spatial-temporal gaze behaviour patterns were analysed as normal participants wearing a mobile eye tracker were required to step on 17 footprints, regularly or irregularly spaced over a 10-m distance, placed in their travel path. We examined the characteristics of two types of gaze fixation with respect to the participants' stepping patterns: footprint fixation; and travel fixation when the gaze is stable and travelling at the speed of whole body. The results showed that travel gaze fixation is a dominant gaze behaviour occupying over 50% of the travel time. It is hypothesised that this gaze behaviour would facilitate acquisition of environmental and self-motion information from the optic flow that is generated during locomotion: this in turn would guide movements of the lower limbs to the appropriate landing targets. When participants did fixate on the landing target they did so on average two steps ahead, about 800–1,000 ms before the limb is placed on the target area. This would allow them sufficient time to successfully modify their gait patterns. None of the gaze behaviours was influenced by the placement (regularly versus irregularly spaced) of the footprints or repeated exposures to the travel path. Rather visual information acquired during each trial was used "de novo" to modulate gait patterns. This study provides a clear temporal link between gaze and stepping pattern and adds to our understanding of how vision is used to regulate locomotion.

Gender Differences in Loneliness

Abstract: Earlier studies on gender differences in loneliness appear to have produced contradictory results. However, when 39 existing data sets were classified according to whether they used the UCLA scale (N = 28) or a self-labeling measure (N = II) of loneliness, the results revealed a clear pattern. Statistically significant sex differences are not usually found with the UCLA scale, but, when they are found, males typically have higher loneliness scores. In terms of self-labeling, women more frequently than men admit being lonely. Sex role factors may help explain these seemingly contradictory results. Of the various possible explanations of the gender differences in self-labeled loneliness, most assume that social influence processes play a crucial role. To test this viewpoint, an experiment was conducted. Subjects (N = 117) were presented with a case history of a lonely person, which varied only the target person's sex. The subjects were more rejecting of a lonely male than of a lonely female. These results s...