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Search Results: 1 - 10 of 851 matches for " France Landry "
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Trouble déficitaire de l’attention à l’université
France Landry,Georgette Goupil
Revue Internationale de Pédagogie de l’Enseignement Supérieur , 2011,
Abstract: Cet article présente un portrait du trouble déficitaire de l’attention avec ou sans hyperactivité (TDA/H) chez les adultes et, plus particulièrement, chez les étudiants universitaires. Après avoir défini le TDA/H, le texte expose les défis de ces étudiants et la situation des universités québécoises sur cette question. La deuxième partie illustre un exemple d’intervention auprès de ces étudiants, soit un programme de tutorat appliqué à l’Université du Québec à Montréal. This article presents a descriptive portrait of Attention Deficit Hyperactivity Disorder (ADHD) in adults, more particularly in university students. After describing ADHD, we will look at the many challenges those students may encounter during their university studies. Moreover, we will present a tutoring program that is currently taking place at the University of Québec in Montréal (UQAM).
Collision Vehicle Detection System Based on GPS/INS Integration  [PDF]
Neda Navidi, Rene Jr. Landry
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.52006
Abstract: Continuous vehicle tracking as well as detecting accidents, are significant services that are needed by many industries including insurance and vehicle rental companies. The main goal of this paper is to provide methods to detect the position of car accident. The models consider GPS/INS-based navigation algorithm, calibration of navigational sensors, a de-nosing method as long as vehicle accident, expressed by a set of raw measurements which are obtained from various environmental sensors. In addition, the location-based accident detection model is tested in different scenarios. The results illustrate that under harsh environments with no GPS signal, location of accident can be detected. Also results confirm that calibration of sensors has an important role in position correction algorithm. Finally, the results present that the proposed accident detection algorithm can recognize accidents and related its positions.
Les gar ons et les filles du neuvième art 1970 - 1989
Landry Passa
Genre & Histoire , 2009,
Abstract: La bande dessinée est un phénomène culturel de masse d’une ampleur qui fut largement sous estimée. Aujourd’hui il est de bon ton de se réclamer d’une culture “bédéphile” mais cela n’a pas toujours été le cas. Des avancées notables permettent de reconna tre la bande dessinée comme un pan non négligeable du paysage culturel du XXe siècle et les petits “miquets” sont révélateurs du contexte socioculturel dans lequel ils ont été produits. Le cinéma puise avec plus ou moins de bonheur dans ce vivi...
Media, Technologies and Human Rights: Competing Concepts. Canadian and International Cases
Normand LANDRY
Essachess : Journal for Communication Studies , 2012,
Abstract: This article discusses the conceptual issues and contemporary legal debates with regard to human rights and communication. It provides a historical analysis of the controversies that have accompanied the emergence of discourses calling for the adoption a universal right to communicate.
Extension of analytic covers by extension of their ramification divisor
Landry Lavoine
Mathematics , 2015,
Abstract: In this paper we prove some topological extension theorems for analytic covers. The main result is an extension theorem which only uses the extension of the ramification divisor. We give also a Thullen-type and a Hartogs-type extensions theorems.
Analysis of GNSS Interference Impact on Society and Evaluation of Spectrum Protection Strategies  [PDF]
Do Alexis Sanou, René Jr. Landry
Positioning (POS) , 2013, DOI: 10.4236/pos.2013.42017
Abstract:

Global Navigation Satellite System (GNSS) technology is growing fast in our society and new applications are being introduced at an unprecedented pace. The GNSS products provide worldwide and real-time services using precise timing information, positioning and synchronization technologies. Within years, GNSS applications are becoming more accurate and their precision opens doors to a wide range of applications. Nevertheless, these applications are susceptible to disruption in the operation of GNSS receivers when malfunctions, failures or interference occur. This paper’s objective is to make an overall analysis of GNSS failure impact on society and therefore make a review of GNSS spectrum protection strategies. In the first three sections of this analysis, we survey GNSS applications, their importance and their criticality. While questioning the criticality of GNSS applications, we evaluate their impact on main critical infrastructures and particularly the risks of critical dependencies in case of failure or interference. In the last two sections, we investigate GNSS spectrum interference in relation to its effects on crucial infrastructures. We review the principal Radio Frequency Interference (RFI) sources leading to GNSS and satellite communications (SATCOM) spectrum issues. Alongside, we study various ways to mitigate RFI. This process is essential to further develop and standardize mitigation techniques and to ensure GNSS spectrum immunity against RFI.

Acquisition of Weak Signals in Multi-Constellation Frequency Domain Receivers  [PDF]
Kaveh Mollaiyan, Rock Santerre, René Jr. Landry
Positioning (POS) , 2013, DOI: 10.4236/pos.2013.42014
Abstract:

New positioning applications’ availability requirements demand receivers with higher sensitivities and ability to process multiple GNSS signals. Possible applications include acquiring one signal per GNSS constellation in the same frequency band and combining them for increased sensitivity or predicting acquisition of other signals. Frequency domain processing can be used for this purpose, since it benefits from parallel processing capabilities of Fast Fourier Transform (FFT), which can be efficiently implemented in software receivers. On the other hand, long coherent integration times are mainly limited due to large FFT size in receivers using frequency domain techniques. A new method is proposed to address the problems in frequency domain receivers without compromising the resources and execution time. A pre-correlation accumulation (PCA) is proposed to partition the received samples into one-code-period blocks, and to sum them together. As a result, the noise is averaged out and the correlation results will gain more power, provided that the relative phase between the data segments is compensated for. In addition to simplicity, the proposed PCA method enables the use of one-size FFT for all integration times. A post-correlation peak combination is also proposed to remove the need for double buffering. The proposed methods are implemented in a configurable Simulink model, developed for acquiring recorded GNSS signals. For weak signal scenarios, a Spirent GPS simulator is used as a source. Acquisition results for GPS L1 C/A and GLONASS L1OF are shown and the performance of the proposed technique is discussed. The proposed techniques target GNSS receivers using frequency domain processing aiming at accommodating all the GNSS signals, while minimizing resource usage. They also apply to weak signal acquisition in frequency domain to answer the availability demand of today’s GNSS positioning applications.

Efficient and Innovative Techniques for Collective Acquisition of Weak GNSS Signals  [PDF]
Maherizo Andrianarison, Mohamed Sahmoudi, René Jr Landry
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.56006
Abstract: Navigation and positioning in harsh environments is still a great challenge for many applications. Collective Detection (CD) is a powerful approach for acquiring highly attenuated satellite signals in challenging environments, because of its capacity to process all visible satellites collectively taking advantage of the spatial correlation between GNSS signals as a vector acquisition scheme. CD combines the correlator outputs of satellite channels and projects them onto the position/clock bias domain in order to enhance the overall GNSS signal detection probability. In CD, the code phase search for all satellites in view is mapped into a receiver position/clock bias grid and the satellite signals are not acquired individually but collectively. In this concept, a priori knowledge of satellite ephemeris and reference location are provided to the user. Furthermore, CD addresses some of the inherent drawbacks of the conventional acquisition at the expenses of an increased computational cost. CD techniques are computationally intensive because of the significant number of candidate points in the position-time domain. The aim of this paper is to describe the operation of the CD approach incorporating new methods and architectures to address both the complexity and sensitivity problems. The first method consists of hybridizing the collective detection approach with some correlation techniques and coupling it with a better technique for Doppler frequency estimate. For that, a new scheme with less calculation load is proposed in order to accelerate the detection and location process. Then, high sensitivity acquisition techniques using long coherent integration and non-coherent integration are used in order to improve the performance of the CD algorithm.
New Strategy of Collaborative Acquisition for Connected GNSS Receivers in Deep Urban Environments  [PDF]
Maherizo Andrianarison, Mohamed Sahmoudi, René Jr. Landry
Positioning (POS) , 2018, DOI: 10.4236/pos.2018.93003
Abstract: Collaborative Positioning (CP) is a better localization technique used to locate a user in challenged environments, which is driven by the increasing presence of cellular phones and mobile devices in urban areas. The basic idea is that the mobile devices can cooperate with each other to improve their ability to determine their position. In this concept, a network of GNSS (Global Navigation Satellite System) receivers can collectively receive available satellite signals, and each receiver can receive signal measurements from other receivers via a communication link. This work shows how to use the Collective Detection (CD) approach to deal with the concept of collaborative or cooperative positioning. Specifically, this paper develops a new strategy allowing a receiver in deep urban environment to locate using the CD approach, while overcoming the implementation complexity problem. The idea consists in applying the CD approach in the case of multiple GNSS receivers to assist a receiver in a difficult situation. A typical case of two connected receivers assisting a receiver in difficulty in a deep urban area shows the effectiveness of this strategy. This strategy is tested with real GNSS signals to analyze its feasibility. The overall gain in complexity can reach up to 46% of what has been achieved in previous works.

Characteristics of symptoms of imminent eclampsia: A case referent study from a tertiary hospital in Tanzania  [PDF]
John France, Projestine S. Muganyizi
Open Journal of Obstetrics and Gynecology (OJOG) , 2012, DOI: 10.4236/ojog.2012.23065
Abstract: Background: Maternal mortality in developing countries is unacceptably high with eclampsia being consistently among the top causes. As yet, primary prevention of this complication is not possible since causes of preeclampsia are largely unknown and bio-chemical, hematological and radiological markers have proved unsuitable for routine prediction of eclamptic fits. Although headache, visual disturbance, abdominal pain, nausea, and vomiting are routinely elicited when managing pre-eclampsia and have been reported to predict eclamptic fits, the literature attempting to characterize them is scanty. We sought to establish characteristics of the prodromal symptoms of eclampsia and compare them with similar symptoms as experienced by normotensive pregnant women at Muhimbili National Hospital (MNH) in Tanzania. Methods: This study was conducted at MNH in 2010 by enrolling 123 eclamptic and 123 normotensive women. Women in the two groups were interviewed about their experiences and characteristics of headache, visual disturbances, abdominal pain, nausea and vomiting using a semi structured questionnaire. The severity, nature and other characteristics of the symptoms were assessed using standard scale/methods and data compared among the two groups. Results: Prodromal symptoms of eclampsia were present in 90% of eclamptic women. Headache was more frequent among eclamptic women (88%) than the normotensive (43%), p < 0.001). The symptom was also more perceived as severe among eclamptic (46.3%) than the normotensive (5.7%), p < 0.001. The most frequent location for headache was frontal in 65.7% of eclamptic women compared to frontal (41.5%) or generalized (39.6%) for the normotensive. Likewise, visual problems were significantly more frequent among eclamptic women (39%) compared to the normotensive (3%), p < 0.001. Upper abdominal pain was significantly more reported by eclamptic (36%) than normotensive women (0.9%), p = 0.001. The general occurrence of abdominal pain, nausea and vomiting was not significantly different in the two groups. The time lag from development of a symptom to eclamptic fit was up to seven days for most symptoms except visual disturbances of which 98% developed fits within 12 hours. Conclusion: Whereas the prodromal symptoms of eclampsia and similar symptoms in normotensive women were common, the characteristics of headache and visual disturbance differ significantly in the two groups. The knowledge of these differences could be utilized to improve the quality of management of pre eclamptic women in order to prevent eclampsia.
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