Search results for "CONST"

Monotonicity and enclosure methods for the p-Laplace equation

2018

We show that the convex hull of a monotone perturbation of a homogeneous background conductivity in the $p$-conductivity equation is determined by knowledge of the nonlinear Dirichlet-Neumann operator. We give two independent proofs, one of which is based on the monotonicity method and the other on the enclosure method. Our results are constructive and require no jump or smoothness properties on the conductivity perturbation or its support.

A constructive theory of shape

2021

We formulate a theory of shape valid for objects of arbitrary dimension whose contours are path connected. We apply this theory to the design and modeling of viable trajectories of complex dynamical systems. Infinite families of qualitatively similar shapes are constructed giving as input a finite ordered set of characteristic points (landmarks) and the value of a continuous parameter $\kappa \in (0,\infty)$. We prove that all shapes belonging to the same family are located within the convex hull of the landmarks. The theory is constructive in the sense that it provides a systematic means to build a mathematical model for any shape taken from the physical world. We illustrate this with a va…

Graph cut-based method for segmenting the left ventricle from MRI or echocardiographic images

2017

International audience; In this paper, we present a fast and interactive graph cut method for 3D segmentation of the endocardial wall of the left ventricle (LV) adapted to work on two of the most widely used modalities: magnetic resonance imaging (MRI) and echocardiography. Our method accounts for the fundamentally different nature of both modalities: 3D echocardiographic images have a low contrast, a poor signal-to-noise ratio and frequent signal drop, while MR images are more detailed but also cluttered and contain highly anisotropic voxels. The main characteristic of our method is to work in a 3D Bezier coordinate system instead of the original Euclidean space. This comes with several ad…

Daugavet- and delta-points in Banach spaces with unconditional bases

2020

We study the existence of Daugavet- and delta-points in the unit sphere of Banach spaces with a 1 1 -unconditional basis. A norm one element x x in a Banach space is a Daugavet-point (resp. delta-point) if every element in the unit ball (resp. x x itself) is in the closed convex hull of unit ball elements that are almost at distance 2 2 from x x . A Banach space has the Daugavet property (resp. diametral local diameter two property) if and only if every norm one element is a Daugavet-point (resp. delta-point). It is well-known that a Banach space with the Daugavet property does not have an unconditional basis. Similarly spaces with the diametral local diameter two property do not have an un…

Latinoamérica y Vargas Llosa / 3

2006

Traditional studying for examination versus constructivist learning tasks: Do learning outcomes differ?

1998

ABSTRACT Students' learning outcomes on an educational psychology course which involved studying three textbooks were compared between a constructivist class without a final examination and a traditional class concluding with an examination. The constructivist group (n = 16) studied the coursebooks with the help of writing assignments, discussed their assignments in groups and wrote an essay. The control group (n = 23) read the books on their own, attended lectures and took an examination. Learning outcomes were investigated (1) as the students' subjective learning experiences; (2) as changes in the students' learning conceptions; and (3) as measured by a traditional examination in which th…

Teaching and learning business ethics in a multicultural group

2017

Building on a constructivist learning theory and a case teaching method, this article suggests a mixed learning approach for teaching business ethics in a multicultural group. The purpose is to present the objectives and implementation of the mixed learning approach in a case course with a multicultural group. Based on the students' feedback, we also analyse and discuss the effects of the mixed learning approach on students' learning experiences. The article contributes to the growing stream of literature on business ethics teaching in higher education by presenting an approach that allows teachers and students to join in constructive knowledge creation in a multicultural group. In so doing…

Social sensitivity:a manifesto for CSCL research

2021

International audience; Technologies for computer-supported collaborative learning (CSCL) are playing an increasingly prominent role in educational contexts, especially as teachers and students strive to deal with pandemic-related constraints. However, the technologies being used for collaboration on a daily basis are not sufficiently equipped to promote collaborative learning as both a cognitive and a socio-emotional process. They may even run the risk of hindering the constructive exchange of ideas and provoking disputes and negative encounters. In this squib, we argue that the field of CSCL is failing to address this risk, because our research efforts are far too scattered and siloed. We…

Philosophical and ethical concerns in researching online learning groups

2016

There is hype in the use of technology for teaching and learning. Online learning groups have been preferred and advocated for increasing learning. However, developing technology supported teaching and learning require user centered approaches to ensure that the design solutions meet users' needs. Since the research is situated within a practice area of online learning groups, pragmatism and social constructivism will inform this study. In this paper, pragmatism and social constructivism philosophy is discussed. The non-consequentialist philosophical ethical approach and how it relates to this research field is also analyzed. The paper argues that non-consequentialist philosophical ethical …

Scripting as a pedagogical method to guide collaborative writing : university students' reflections

2020

A collaboration script is a set of instructions used to improve collaborative learning among students in technology-enhanced environments. Previously, university students’ perspective has been under-represented in the study on collaboration scripts. In this article, we focus on understanding students’ experiences in a scripted collaborative writing task, especially from the perspective of following the script. The study was conducted among undergraduate students (N = 91) taking a master-level educational science course at one university each in Finland and Belgium. Divided into 25 groups, each with three to five members, the students worked on collaborative writing tasks. During their share…