Improved Algorithm for Pathological and Normal Voices Identification

There are a lot of papers on automatic classification between normal and pathological voices, but they have the lack in the degree of severity estimation of the identified voice disorders. Building a model of pathological and normal voices identification, that can also evaluate the degree of severity of the identified voice disorders among students. In the present work, we present an automatic classifier using acoustical measurements on registered sustained vowels /a/ and pattern recognition tools based on neural networks. The training set was done by classifying students’ recorded voices based on threshold from the literature. We retrieve the pitch, jitter, shimmer and harmonic-to-noise ratio values of the speech utterance /a/, which constitute the input vector of the neural network. The degree of severity is estimated to evaluate how the parameters are far from the standard values based on the percent of normal and pathological values. In this work, the base data used for testing the proposed algorithm of the neural network is formed by healthy and pathological voices from German database of voice disorders. The performance of the proposed algorithm is evaluated in a term of the accuracy (97.9%), sensitivity (1.6%), and specificity (95.1%). The classification rate is 90% for normal class and 95% for pathological class

Highly sensitive pseudo-differential ac-nanocalorimeter for the study of the glass transition

International audienceWe present a nanocalorimeter designed for the measurement of the dynamic heat capacity of thin films. The microfabricated sensor, the thermal conditioning of the sensor as well as the highly stable and low noise electronic chain allow measurements of the real and imaginary parts of the complex specific heat with a resolution ∆C/C of about 10 −5. The performances of this quasi-differential nanocalorimeter were tested on a model of polymeric glass-former, the PVAc. The high stability and low noise of the device are essential for accurate studies on non-equilibrium slow relaxing systems such as glasses

Difficultés De Mise En Œuvre De La Continuité Didactique Mathématique-Mécanique Au Secondaire Collégial, Registre Sémiotique Et Transfert Comme Éléments D’analyse

This article deals with the numerous pedagogical and didactic constraints to the transdisciplinary knowledge transfer between mathematics and physics (mechanics) at the last year of secondary school. By taking into consideration the three entities of the didactic triangle (Content, students and teachers), we analyzed in this exploratory study official pedagogical orientations, curricula and textbooks of mathematics and physics. Then, we administered to a sample of 12 to 15-year-old pupils, mathematical and physical written questionnaires in which they have to use proportionality/linearity concept by considering different register of semiotic representation and the rationality frame of each discipline., the analysis of the results reveal some difficulties that can be explained by a lack of knowledge related to the change of rationality frame and semiotic register rules. In order to understand the origin of these difficulties, we proceeded by analyzing the transdisciplinary practices of mathematics/physics teachers by means of a written semi-open questionnaire whose results highlight interdidactic rupture between mathematics and physics. To remedy that, we propose some strategies and possible lines of actions

Les Difficultes Inherentes A La Mobilisation Des Connaissances Mathematiques Dans La Physique, Cas De La Mecanique Au College

This study focuses on the difficulties of pupils in final year of college cycle (14-17 years) to mobilize mathematical knowledge in mechanical modeling activities. The objective is to try to understand the dynamics of the transfer of mathematical knowledge in modeling the concept of "speed" and the notion of "force." To do this, we developed two individual written questionnaires to a sample of pupils. One focuses on mathematics and the other mechanics. To better interpret some results, we held individual interviews with a sample of pupils. Analysis and interpretation of the results of the questionnaires and interviews show that the mathematical knowledge mobilization difficulties are due in the first hand to the non mastery of this knowledge in mathematic courses and the second hand to the fact that pupils aren’t conscious of the linkages which exist between mathematic and physic. The students having answered correctly seem adopting memorization strategies than cognitive strategies conducive to the transfer

Mesures cristallographiques par rayons X sur monocristaux a applications industrielles

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Remote Lab Experiments in Mechanic: The Compound Pendulum

In the teaching of experimental sciences, practical work plays a crucial role since it allows learners to transfer the knowledge acquired in theoretical courses into practical skills. For this purpose, laboratories allow learning by experience and aim at involving students, which reinforces learning receptivity. Recent years have seen an increasing use of online labs, including both virtual and remote labs, Remote labs, providing online interfaces to physical labs, allow students to conduct experiments with real-world equipment anywhere and at any time. This paper proposes a model of design, development and implementation of a remote manipulation in an E-Lab. It is the compound pendulum which is part of the handling offered to the students of the 1st year of university in the field of physical sciences. The aim of this paper is to make this approach available to allow more experiments on a digital platform in order to allow learning for all, independently of time and place

Design and Implementation of a Reservation System and a New Queuing for Remote Labs

Remote laboratories are important in education because they provide access to equipment that some institutions cannot afford to purchase or maintain, reduce the need for dedicated physical space for equipment and personnel to staff laboratories. But more than just fill the absence of real physical laboratories; remote laboratories can improve the users experience through the use of adaptive and specific. An important element in supporting shared access is coordinating the scheduling of the laboratory usage. Optimized scheduling can significantly decrease access waiting times and improve the utilization level of remote laboratories resources, with associated reductions in per-use costs.The user management systems that exist so far are limited, and not compatible with all remote lab interface development software. For that, we worked on the development of a new user management system for remote laboratories.This paper proposes a model and set of diagrams that define the new reservation system and a new Queuing for remote laboratories for educational purposes.</p

Design and Implementation of a Reservation System and a New Queuing for Remote Labs

Remote laboratories are important in education because they provide access to equipment that some institutions cannot afford to purchase or maintain, reduce the need for dedicated physical space for equipment and personnel to staff laboratories. But more than just fill the absence of real physical laboratories; remote laboratories can improve the users experience through the use of adaptive and specific. An important element in supporting shared access is coordinating the scheduling of the laboratory usage. Optimized scheduling can significantly decrease access waiting times and improve the utilization level of remote laboratories resources, with associated reductions in per-use costs.The user management systems that exist so far are limited, and not compatible with all remote lab interface development software. For that, we worked on the development of a new user management system for remote laboratories.This paper proposes a model and set of diagrams that define the new reservation system and a new Queuing for remote laboratories for educational purposes

Proposal for a New Tool to Evaluate a Serious Game

The current enthusiasm of generations of students for video games and the marked interest of training institutions for the use of playful strategies, which facilitate learning, has encouraged the development and use of formative games called Serious Games. The main aim behind these games is not to substitute the traditional training mode, but to complement it by making the learner benefit from the interactivity and ergonomics of the graphical interfaces offered by a SG. So far, much research work has focused on the benefits that SGs can bring to a training envi-ronment. However, little has been done in terms of evaluating an SG, not as a training tool but as the outcome of a development project of a tool meant for use in a learning context. The purpose of this paper is to propose an evaluation tool of a SG designed in terms of four necessary dimensions that a SG should have in order to fulfill the task for which it was designed. These four dimensions are represented in terms of measurement criteria and prioritized according to the Fuzzy-AHP method « Fuzzy Analytic Hierarchy Process ». This model was tested on an SG validated by an educational committee and used by biology students in Hassan II University, Ben M'Sik Faculty of Sciences. The results obtained show the quality and relevance of the evaluation of the proposed tool

Design and Simulation of a Solar Energy System for Desalination of Brackish Water

In light of a sort of crisis of water scarcity which begins to loom worldwide as well as the economic constraints for achieving sustainable development, it becomes essential to find appropriate solutions to face this challenge. Morocco, which has considerable brackish water resources and an important solar resource deposit, is required to use desalination techniques; however, the reliability of such techniques can no longer be applied just in terms of their value as renewable sources of energy. The solution presented in this publication, establishes a rather reliable way to produce drinking water. The technique of desalination by reverse osmosis is considered in this study to be a promising technique. The objective of our study is the implementation of a prototype for desalination of reverse osmosis, which is a low-cost small unit used to treat brackish water based on solar energy