Institution
Concordia University
Education•Montreal, Quebec, Canada•
About: Concordia University is a education organization based out in Montreal, Quebec, Canada. It is known for research contribution in the topics: Control theory & Population. The organization has 13565 authors who have published 31084 publications receiving 783525 citations. The organization is also known as: Sir George Williams University & Loyola College, Montreal.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: Results from functional magnetic resonance imaging providing high spatial resolution and event-related potentials (ERPs) to gain high temporal resolution support the view that the prefrontal cortex is involved in updating of general task representations and biases relevant stimulus-response associations in the parietal cortex.
Abstract: Cognitive control processes enable us to adjust our behavior to changing environmental demands. Although neuropsychological studies suggest that the critical cortical region for cognitive control is the prefrontal cortex, neuro-imaging studies have emphasized the interplay of prefrontal and parietal cortices. This raises the fundamental question about the different contributions of prefrontal and parietal areas in cognitive control. It was assumed that the prefrontal cortex biases processing in posterior brain regions. This assumption leads to the hypothesis that neural activity in the prefrontal cortex should precede parietal activity in cognitive control. The present study tested this assumption by combining results from functional magnetic resonance imaging (fMRI) providing high spatial resolution and event-related potentials (ERPs) to gain high temporal resolution. We collected ERP data using a modified task-switching paradigm. In this paradigm, a situation where the same task was indicated by two different cues was compared with a situation where two cues indicated different tasks. Only the latter condition required updating of the task set. Task-set updating was associated with a midline negative ERP deflection peaking around 470 msec. We placed dipoles in regions activated in a previous fMRI study that used the same paradigm (left inferior frontal junction, right inferior frontal gyrus, right parietal cortex) and fitted their directions and magnitudes to the ERP effect. The frontal dipoles contributed to the ERP effect earlier than the parietal dipole, providing support for the view that the prefrontal cortex is involved in updating of general task representations and biases relevant stimulus–response associations in the parietal cortex.
228 citations
••
TL;DR: Second-language acquisition research has been a hot topic in the last few decades as mentioned in this paper, with a large number of studies being carried out in the field. But the main contribution of second-language research lies not so much in what it has to say regarding the development of syllabus content or specific teaching methods, but rather in the development expectations on the part of teachers for what they and their students can accomplish.
Abstract: In fact, I am convinced that second-language research does have much to con-tribute to teaching practice in the long run. However, I believe that at present itscontribution lies not so much in what it has to say regarding the development ofsyllabus content or specific teaching methods as in what it has to say regarding thedevelopment of expectations on the part of teachers for what they and theirstudents can accomplish. Thus my title refers to two kinds of 'expectations':(1) the expectations of both teachers and researchers that second-language acquisi-tion research findings will have implications for what to teach and how to teach;(2) teachers' expectations of themselves and of their language-learning students.In this article I will very briefly review the kind of research which has been andis being carried out in second-language acquisition. I will then outline what Iconsider to be some of the most widely agreed-upon generalizations which can bedrawn from the research to date. Finally, I will discuss the ways in which I thinkit is appropriate to apply these generalizations to second-language teaching.1. SECOND-LANGUAGE ACQUISITION RESEARCH: A BRIEF REVIEWThe term 'second-language acquisition research' refers to studies which are de-signed to investigate questions about learners' use of their second language and theprocesses which underlie second-language acquisition and use. The field of researchis new—less than twenty years old if we leave out work done in the 1950s and1960s in what might be called 'preventive contrastive analysis'. Most people in thefield identify two significant papers which mark the beginning: Corder's 1967paper "The significance of learners' errors' and Selinker's 1972 paper which, in itstitle, gave a name to the object of investigation, 'Interlanguage'.Since the early 1970s, second-language acquisition research has been carriedout within a number of different theoretical frameworks and has made use ofa number of different research methods. In a 1977 review article, Hakuta andCancino summarized second-language acquisition research carried out within fourmain approaches: contrastive analysis, error analysis, performance analysis, anddiscourse analysis. Hakuta and Cancino treated these almost as a 'trial and error'series, with each new approach improving on and largely replacing the one whichpreceded it. With a few more years of hindsight, it seems that all four approachescontinue to be important to the field. Each one complements the others, ratherthan replacing them. In addition to these four, and interacting with them, areseveral approaches to second-language acquisition research which have beendeveloped in the past few years. For example, a number of recent studies are basedon a sociolinguistic approach, and there has been a great increase in the number of
227 citations
••
TL;DR: It is argued that due to the social and networked nature of social media it is an ideal environment forBrand communities and researchers are advised to consider these dimensions while conducting research on brand communities and social media.
227 citations
••
TL;DR: In this article, the Douglas-Gunn algorithm is used to subdivide the update procedure into two sub-steps, at each sub-step only a tri-diagonal matrix needs to be solved for one field component, and other two field components are updated explicitly in one step.
Abstract: The Crank-Nicolson method is an unconditionally stable, implicit numerical scheme with second-order accuracy in both time and space. When applied to solve Maxwell's equations in two-dimensions, the resulting matrix is block tri-diagonal, which is very expensive to solve. The Douglas-Gunn algorithm is used to subdivide the update procedure into two sub-steps. At each sub-step only a tri-diagonal matrix needs to be solved for one field component. The other two field components are updated explicitly in one step. The numerical dispersion relations are given for the original Crank-Nicolson scheme and for the Douglas-Gunn modification. The predicted numerical dispersion is shown to agree with numerical experiments, and its numerical anisotropy is shown to be much smaller than that of the ADI-FDTD.
227 citations
••
12 Aug 2012
TL;DR: This paper presents an efficient data-dependent yet differentially private transit data sanitization approach based on a hybrid-granularity prefix tree structure, and is the first paper to introduce a practical solution for publishing large volume of sequential data under differential privacy.
Abstract: With the wide deployment of smart card automated fare collection (SCAFC) systems, public transit agencies have been benefiting from huge volume of transit data, a kind of sequential data, collected every day. Yet, improper publishing and use of transit data could jeopardize passengers' privacy. In this paper, we present our solution to transit data publication under the rigorous differential privacy model for the Societe de transport de Montreal (STM). We propose an efficient data-dependent yet differentially private transit data sanitization approach based on a hybrid-granularity prefix tree structure. Moreover, as a post-processing step, we make use of the inherent consistency constraints of a prefix tree to conduct constrained inferences, which lead to better utility. Our solution not only applies to general sequential data, but also can be seamlessly extended to trajectory data. To our best knowledge, this is the first paper to introduce a practical solution for publishing large volume of sequential data under differential privacy. We examine data utility in terms of two popular data analysis tasks conducted at the STM, namely count queries and frequent sequential pattern mining. Extensive experiments on real-life STM datasets confirm that our approach maintains high utility and is scalable to large datasets.
226 citations
Authors
Showing all 13754 results
Name | H-index | Papers | Citations |
---|---|---|---|
Alan C. Evans | 183 | 866 | 134642 |
Michael J. Meaney | 136 | 604 | 81128 |
Chao Zhang | 127 | 3119 | 84711 |
Charles Spence | 111 | 949 | 51159 |
Angappa Gunasekaran | 101 | 586 | 40633 |
Kaushik Roy | 97 | 1402 | 42661 |
Muthiah Manoharan | 96 | 497 | 44464 |
Stephen J. Simpson | 95 | 490 | 30226 |
Roy A. Wise | 95 | 252 | 39509 |
Dario Farina | 94 | 832 | 32786 |
Yavin Shaham | 94 | 239 | 29596 |
Elazer R. Edelman | 89 | 593 | 29980 |
Fikret Berkes | 88 | 271 | 49585 |
Ke Wu | 87 | 1242 | 33226 |
Nick Serpone | 85 | 474 | 30532 |