University of Winnipeg

About: University of Winnipeg is a education organization based out in Winnipeg, Manitoba, Canada. It is known for research contribution in the topics: Population & Context (language use). The organization has 3235 authors who have published 6413 publications receiving 150564 citations. The organization is also known as: U of W.

Local Broadcast Algorithms in Wireless Ad Hoc Networks: Reducing the Number of Transmissions

Abstract: There are two main approaches, static and dynamic, to broadcast algorithms in wireless ad hoc networks. In the static approach, local algorithms determine the status (forwarding/nonforwarding) of each node proactively based on local topology information and a globally known priority function. In this paper, we first show that local broadcast algorithms based on the static approach cannot achieve a good approximation factor to the optimum solution (an NP-hard problem). However, we show that a constant approximation factor is achievable if (relative) position information is available. In the dynamic approach, local algorithms determine the status of each node "on-the-fly” based on local topology information and broadcast state information. Using the dynamic approach, it was recently shown that local broadcast algorithms can achieve a constant approximation factor to the optimum solution when (approximate) position information is available. However, using position information can simplify the problem. Also, in some applications it may not be practical to have position information. Therefore, we wish to know whether local broadcast algorithms based on the dynamic approach can achieve a constant approximation factor without using position information. We answer this question in the positive-we design a local broadcast algorithm in which the status of each node is decided "on-the-fly” and prove that the algorithm can achieve both full delivery and a constant approximation to the optimum solution.

The Relationship between Imagery Ability and Imagery Use among Athletes

Abstract: The present study aimed to provide a better understanding of the relationship between imagery ability and imagery use. Athletes completed the Movement Imagery Questionnaire—Revised Second Version, the Motivational Imagery Ability Measure for Sport, and the Sport Imagery Questionnaire. Hierarchical regression analyses revealed that imagery ability explained 20 to 41% of the variance in the use of the functions of imagery. Visual and kinesthetic imagery ability predicted cognitive specific imagery use; motivational general-mastery and motivational general-arousal imagery ability predicted the use of the motivational general functions of imagery. To assess imagery ability multiple methods of assessment must be used.

Bayes estimation of the parameters and reliability function of the 3-parameter Weibull distribution

Abstract: The authors obtain Bayes estimates of the parameters and reliability function of a 3-parameter Weibull distribution and compare posterior standard-deviation estimates with the corresponding asymptotic standard-deviation estimates of their maximum likelihood counterparts. Numerical examples are given. >

System justification: Experimental evidence, its contextual nature, and implications for social change.

Abstract: We review conceptual and empirical contributions to system justification theory over the last fifteen years, emphasizing the importance of an experimental approach and consideration of context. First, we review the indirect evidence of the system justification motive via complimentary stereotyping. Second, we describe injunctification as direct evidence of a tendency to view the extant status quo (the way things are) as the way things should be. Third, we elaborate on system justification's contextual nature and the circumstances, such as threat, dependence, inescapability, and system confidence, which are likely to elicit defensive bolstering of the status quo and motivated ignorance of critical social issues. Fourth, we describe how system justification theory can increase our understanding of both resistance to and acceptance of social change, as a change moves from proposed, to imminent, to established. Finally, we discuss how threatened systems shore up their authority by co-opting legitimacy from other sources, such as governments that draw on religious concepts, and the role of institutional-level factors in perpetuating the status quo.