scispace - formally typeset
Search or ask a question
Institution

Concordia University

EducationMontreal, 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
More filters
Journal ArticleDOI
TL;DR: In this article, the authors performed hot torsion tests on Al-Zn-Mg-Cu alloys (7012 and 7075), which had been direct chill cast, homogenized and precipitation treated to give fine, well-dispersed precipitates.
Abstract: Hot torsion tests, in the range 250–450 °C and 0.05–5.0 s−1, were performed on AlZnMgCu alloys (7012 and 7075), which had been direct chill cast, homogenized and precipitation treated to give fine, well-dispersed precipitates. Additional tests were conducted on material that had been extruded, solution treated or precipitation treated at deformation temperature. The peak flow stress was related to the strain rate by the hyperbolic sine equation; the activation energy for precipitated alloys was close to that of the bulk self-diffusion of pure aluminium. For solution-treated metal, the peak stress was very high at low temperatures due to dynamic precipitation; as a consequence, the activation energy was about 50% higher than that of precipitated alloys. The ductility was almost independent of temperature in the investigated range, but decreased with rising strain rate. The ductility of the extruded alloys was almost double that of the as-cast material, with the exception of the solution-treated material where, at low temperature, the ductility of the extruded alloy was lower. The original grains were elongated with precipitates on the boundaries. The dynamically recovered subgrains exhibited sub-boundaries with a high density of fine precipitates and an interior network of dislocations also tied to precipitates.

161 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a meta-analysis of the relationship between board attributes and performance of Asian firms using a varied set of meta-analytical techniques on a database of 86 studies covering nine Asian countries.
Abstract: The prevalence of ownership concentration in Asian firms presents a challenge to the influential agency theory-based understanding of the role of corporate boards. In this paper we develop and test hypotheses about board attributes and firm performance that reflect Asian institutional conditions. We present the first meta-analysis of the relationship between board attributes and performance of Asian firms using a varied set of meta-analytical techniques on a database of 86 studies covering nine Asian countries. First, we find that board structure and composition preferences are influenced by the identity of the concentrated owner. Second, consistent with US data, we find very limited evidence of a direct relationship between board attributes and firm financial performance in the Asian context. Third, we find that the relationship between board structure and composition and firm performance is mediated by the revealed strategic preferences of Asian firms specifically by the level of R&D investment.

161 citations

Book ChapterDOI
08 Jul 2007
TL;DR: This paper presents an attack resistance metric that generalizes a previously proposed metric that is also based on attack graphs and shows that the proposed metric satisfies desired properties and that it adheres to common sense.
Abstract: Today's computer systems face sophisticated intrusions during which multiple vulnerabilities can be combined for reaching an attack goal The overall security of a network system cannot simply be determined based on the number of vulnerabilities To quantitatively assess the security of networked systems, one must first understand which and how vulnerabilities can be combined for an attack Such an understanding becomes possible with recent advances in modeling the composition of vulnerabilities as attack graphs Based on our experiences with attack graph analysis, we explore different concepts and issues on a metric to quantify potential attacks To accomplish this, we present an attack resistance metric for assessing and comparing the security of different network configurations This paper describes the metric at an abstract level as two composition operators with features for expressing additional constraints We consider two concrete cases The first case assumes the domain of attack resistance to be real number and the second case represents resistances as a set of initial security conditions We show that the proposed metric satisfies desired properties and that it adheres to common sense At the same time, it generalizes a previously proposed metric that is also based on attack graphs It is our belief that the proposed metric will lead to novel quantitative approaches to vulnerability analysis, network hardening, and attack responses

161 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined the mechanisms of absorption and established a means of developing and using absorption constants for PCM concrete to achieve diffusion of the desired amount of organic PCM and hence the required thermal storage capacity.

161 citations


Authors

Showing all 13754 results

NameH-indexPapersCitations
Alan C. Evans183866134642
Michael J. Meaney13660481128
Chao Zhang127311984711
Charles Spence11194951159
Angappa Gunasekaran10158640633
Kaushik Roy97140242661
Muthiah Manoharan9649744464
Stephen J. Simpson9549030226
Roy A. Wise9525239509
Dario Farina9483232786
Yavin Shaham9423929596
Elazer R. Edelman8959329980
Fikret Berkes8827149585
Ke Wu87124233226
Nick Serpone8547430532
Network Information
Related Institutions (5)
Arizona State University
109.6K papers, 4.4M citations

93% related

Georgia Institute of Technology
119K papers, 4.6M citations

92% related

McGill University
162.5K papers, 6.9M citations

92% related

University of Illinois at Urbana–Champaign
225.1K papers, 10.1M citations

92% related

University of British Columbia
209.6K papers, 9.2M citations

91% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202375
2022343
20211,859
20201,861
20191,734
20181,680