University of Quebec at Outaouais
Ottawa, Canada

The Université du Québec en Outaouais is a branch of the Université du Québec located in Gatineau, Quebec, Canada. As of September 2010, combined enrolment at UQO's Gatineau and Saint-Jérôme campuses was 6,017, of which 4,738 were undergraduates and 1,279 postgraduate students. UQO offers more than 100 programs of study, including 30 master's and 5 doctoral programs.It was named after Quebec's Outaouais region. Outaouais borders Ottawa and is part of the National Capital Region, where a large proportion of the population is bilingual. Wikipedia.

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Czyzowicz J.,University of Quebec at Outaouais | Kosowski A.,Technical University of Gdansk | Pelc A.,University of Quebec at Outaouais
Proceedings of the Annual ACM Symposium on Principles of Distributed Computing | Year: 2010

Two identical (anonymous) mobile agents start from arbitrary nodes in an a priori unknown graph and move synchronously from node to node with the goal of meeting. This rendezvous problem has been thoroughly studied, both for anonymous and for labeled agents, along with another basic task, that of exploring graphs by mobile agents. Intuitively, the rendezvous problem is more difficult than exploration, as it reduces to the latter, if one of the agents is inert. A well-known recent result on exploration, due to Reingold, states that deterministic exploration of arbitrary graphs can be performed in log-space, i.e., using an agent equipped with O(log n) bits of memory, where n is the size of the graph. In this paper we study the size of memory of mobile agents that permits us to solve the rendezvous problem deterministically. Our main result establishes the minimum size of the memory of anonymous agents that guarantees deterministic rendezvous when it is feasible. We show that this minimum size is Θ(log n), where n is the size of the graph, regard-less of the delay between the starting times of the agents. More precisely, we construct identical agents equipped with Θ(log n) memory bits that solve the rendezvous problem in all graphs with at most n nodes, if they start with any delay τ, and we prove a matching lower bound Ω(log n) on the number of memory bits needed to accomplish rendezvous, even for simultaneous start. In fact, this lower bound is achieved already on the class of rings. This shows a significant contrast between rendezvous and exploration: e.g., while exploration of rings (without stopping) can be done using constant memory, rendezvous, even with simultaneous start, requires logarithmic memory. Copyright 2010 ACM.

Delagrange S.,University of Quebec at Outaouais | Delagrange S.,Center for Forest Research | Rochon P.,University of Quebec at Outaouais
Annals of Botany | Year: 2011

Background and Aims To meet the increasing need for rapid and non-destructive extraction of canopy traits, two methods were used and compared with regard to their accuracy in estimatating 2-D and 3-D parameters of a hybrid poplar sapling. Methods The first method consisted of the analysis of high definition photographs in Tree Analyser (TA) software (PIAF-INRA/Kasetsart University). TA allowed the extraction of individual traits using a space carving approach. The second method utilized 3-D point clouds acquired from terrestrial light detection and ranging (T-LiDAR) scans. T-LiDAR scans were performed on trees without leaves to reconstruct the lignified structure of the sapling. From this skeleton, foliage was added using simple modelling rules extrapolated from field measurements. Validation of the estimated dimension and the accuracy of reconstruction was then achieved by comparison with an empirical data set. Key Results TA was found to be slightly less precise than T-LiDAR for estimating tree height, canopy height and mean canopy diameter, but for 2-D traits both methods were, however, fully satisfactory. TA tended to over-estimate total leaf area (error up to 50 ), but better estimates were obtained by reducing the size of the voxels used for calculations. In contrast, T-LiDAR estimated total leaf area with an error of <6 . Finally, both methods led to an over-estimation of canopy volume. With respect to this trait, T-LiDAR (14·5 deviation) greatly surpassed the accuracy of TA (up to 50 deviation), even if the voxels used were reduced in size. Conclusions Taking into account their magnitude of data acquisition and analysis and their accuracy in trait estimations, both methods showed contrasting potential future uses. Specifically, T-LiDAR is a particularly promising tool for investigating the development of large perennial plants, by itself or in association with plant modelling. © The Author 2011. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.

Gosselin E.,University of Quebec at Outaouais | Lemyre L.,University of Ottawa | Corneil W.,University of Ottawa
Journal of Occupational Health Psychology | Year: 2013

In the past it was assumed that work attendance equated to performance. It now appears that healthrelated loss of productivity can be traced equally to workers showing up at work as well as to workers choosing not to. Presenteeism in the workplace, showing up for work while sick, seems now more prevalent than absenteeism. These findings are forcing organizations to reconsider their approaches regarding regular work attendance. Given this, and echoing recommendations in the literature, this study seeks to identify the main behavioral correlates of presenteeism and absenteeism in the workplace. Comparative analysis of the data from a representative sample of executives from the Public Service of Canada enables us to draw a unique picture of presenteeism and absenteeism with regards not only to the impacts of health disorders but also to the demographic, organizational, and individual factors involved. Results provide a better understanding of the similarities and differences between these phenomena, and more specifically, of the differentiated influence of certain variables. These findings provide food for thought and may pave the way to the development of new organizational measures designed to manage absenteeism without creating presenteeism. © 2013 American Psychological Association.

Rissafi Y.,Canada Revenue Agency | Talbi L.,University of Quebec at Outaouais | Ghaddar M.,University of Quebec at Outaouais
IEEE Transactions on Antennas and Propagation | Year: 2012

An experimental characterization of the ultrawideband (UWB) propagation channel in an underground mine environment over the frequency range from 3 GHz to 10 GHz is reported in this paper. Two kinds of antennas, directional and omnidirectional, were used to investigate the effect of the antenna directivity on the path loss propagation and on the time dispersion parameters in both line-of-sight (LOS) and no-line-of-sight (NLOS) underground galleries. The measurement and simulation results show that the path loss exponents in an underground environment are larger than their counterparts in an indoor environment. In NLOS, the directional-directional (Direct-Direct) antenna combination showed better radiation efficiency for reducing the time dispersion parameters while the omnidirectional-omni directional (Omni-Omni) case resulted better performance in term of path loss. After extracting the channel parameters, a statistical modeling of the UWB underground channel based on data measurements was conducted. © 2006 IEEE.

Fraigniaud P.,University Paris Diderot | Pelc A.,University of Quebec at Outaouais
Annual ACM Symposium on Parallelism in Algorithms and Architectures | Year: 2010

The aim of rendezvous in a graph is meeting of two mobile agents at some node of an unknown anonymous connected graph. The two identical agents start from arbitrary nodes in the graph and move from node to node with the goal of meeting. In this paper, we focus on rendezvous in trees, and, analogously to the efforts that have been made for solving the exploration problem with compact automata, we study the size of memory of mobile agents that permits to solve the rendezvous problem deterministically. Werst show that if the delay between the starting times of the agents is arbitrary, then the lower bound on memory required for rendezvous is Ω (log n) bits, even for the line of length n. This lower bound meets a previously known upper bound of O(log n) bits for rendezvous in arbitrary trees of size at most n. Our main result is a proof that the amount of memory needed for rendezvous with simultaneous start depends essentially on the number ℓ of leaves of the tree, and is exponentially less impacted by the number n of nodes. Indeed, we present two identical agents with O(log ℓ+log log n) bits of memory that solve the rendezvous problem in all trees with at most n nodes and at most ℓ leaves. Hence, for the class of trees with polylogarithmically many leaves, there is an exponential gap in minimum memory size needed for rendezvous between the scenario with arbitrary delay and the scenario with delay zero. Moreover, we show that our upper bound is optimal by proving that Ω (log ℓ + log log n) bits of memory is required for rendezvous, even in the class of trees with degrees bounded by 3.

Kumar M.,Indian Institute of Technology Delhi | Kumar A.,Indian Institute of Technology Delhi | Tripathi S.M.,University of Quebec at Outaouais
Optics Communications | Year: 2014

A comparative study of the temperature sensitivities of the single-multi-single mode (SMS) fiber structures employing step-index and graded-index multimode fibers (MMFs), for two different doping concentrations of GeO2 in MMF core, is carried out. The temperature sensitivity for graded-index MMF is found to be much larger (approx. 45-285 times) for the entire range of wavelength operation (0.7-1.6 μm). A physical explanation of the observed behavior is also presented. The study should be useful in designing various fiber optic multimode interference based devices with high or low temperature sensitivities. © 2013 Elsevier B.V.

Fraigniaud P.,University Paris Diderot | Pelc A.,University of Quebec at Outaouais
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

We establish a classification of decision problems that are to be solved by mobile agents operating in unlabeled graphs, using a deterministic protocol. The classification is with respect to the ability of a team of agents to solve the problem, possibly with the aid of additional information. In particular, our focus is on studying differences between the decidability of a decision problem by agents and its verifiability when a certificate for a positive answer is provided to the agents. Our main result shows that there exists a natural complete problem for mobile agent verification. We also show that, for a single agent, three natural oracles yield a strictly increasing chain of relative decidability classes. © 2012 Springer-Verlag Berlin Heidelberg.

Kilpatrick K.,University of Quebec at Outaouais
Canadian journal of cardiovascular nursing = Journal canadien en soins infirmiers cardio-vasculaires | Year: 2011

Acute care nurse practitioners (ACNPs) provide advanced nursing care to patients and families who are experiencing a complex acute, critical or chronic health condition. A clear understanding of ACNP activities may facilitate the deployment of ACNP roles in health care teams. Time and motion studies represent the gold standard to measure clinician work time. A time and motion tool to measure cardiology ACNP activities was developed and pilot-tested in two organizations. The researcher produced a valid and reliable tool. The inter-observer agreement was 0.94 following the pilot study. A training guide and a training schedule were produced to support the use of the time and motion tool. Each activity was defined to facilitate the coding of ACNP activities. A validated tool can contribute to our knowledge of ACNP activities and role components, and identify the ACNPs' contributions to patient care and the functioning of the health care team.

Tripathi S.M.,University of Quebec at Outaouais | Bock W.J.,University of Quebec at Outaouais | Kumar A.,Indian Institute of Technology Delhi | Mikulic P.,University of Quebec at Outaouais
Optics Letters | Year: 2013

In this Letter we report on fabricating and analyzing a temperature insensitive refractometer based on two concatenated dual-resonance long-period gratings (LPGs) with an appropriate inter-grating space (IGS) in between. The IGS provides a temperature-dependent extra phase difference between the core and cladding modes, making the refractometer similar to a Mach-Zehnder interferometer with its arms phase shifted. We demonstrate that an appropriate IGS can produce temperature-insensitive resonance wavelengths. The interferometer is highly stable over a wide range of temperature (20°C-100°C). The measured refractive index sensitivity for aqueous solutions (1.333-1.343) is ∼2583 nm/RIU, which is the highest reported so far for biological samples. The interferometer can be used for various other temperature-immune sensing applications also. © 2013 Optical Society of America.

Dufour M.,University of Quebec at Outaouais
ISCRAM 2015 Conference Proceedings - 12th International Conference on Information Systems for Crisis Response and Management | Year: 2015

Resource coordination between NGOs is crucial to have efficient emergency responses. Information Systems (IS) are a tool facilitating resource transfers, information exchanges, and resource coordination between organizations. They cannot be efficient if they are not adapted to fundamental problems of crisis management and specifically to resource coordination processes. This paper explores the operational aspect of resource transfer processes, the intensity of resource coordination between NGOs, and the characteristics an IS, as a support to those processes, must have to improve the resource coordination. Sixty-five in-depth interviews, documentation, and on-site observations in Chile with 13 NGOs chosen for their diversity allowed identifying different categories of processes. A mixed-transformative approach being used, intensity scores were assigned to processes and global scores were calculated for NGOs, based on their processes. A brief discussion follows on how information systems should be adapted to help these processes to increase coordination intensity.

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