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Article
Publication date: 1 November 1998

Stéphane Perrin and Philippe Boisse

An extension of the concept of error on constitutive relation is proposed to the case of Mindlin plate finite element computations. The error of the performed analysis is…

302

Abstract

An extension of the concept of error on constitutive relation is proposed to the case of Mindlin plate finite element computations. The error of the performed analysis is estimated from the incompatibility in relation with the constitutive equation of admissible fields calculated from the finite element results. In a first stage, loads and moments densities leading to the equilibrium of each element are computed on the element edges as the sums of densities derived from the finite element solution and of densities with a resultant equal to zero on each element edge. Then strictly statically admissible stress resultants are calculated within each element. Both of the two stages allow an optimization for the statically admissible field in order to get a more accurate error. The calculations are local which is very interesting especially in case of complex structure analyses with a large number of degrees of freedom for which adaptivity is an important feature. A set of examples shows the efficiency of the proposed estimator and the good adaptation of the error on constitutive law method to Mindlin plate analysis.

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Engineering Computations, vol. 15 no. 7
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 3 July 2018

Stéphane Clivaz

The purpose of this paper is to elaborate on the commonality between the Theory of Didactical Situations (TDS) and lesson study to propose a model of lesson study using both the…

376

Abstract

Purpose

The purpose of this paper is to elaborate on the commonality between the Theory of Didactical Situations (TDS) and lesson study to propose a model of lesson study using both the predominant graphical representation of lesson study by Lewis and the model of the didactical situation at the heart of TDS by Brousseau.

Design/methodology/approach

Starting by describing and adapting the predominant graphical representation of lesson study by Lewis and the model of the didactical situation at the heart of TDS by Brousseau, the paper integrates the two representations to highlight the commonalities between the students’ learning situation and the teachers’. Based on this integrated graphical representation, the key phases of lesson study are then conceptualised by the mean of the dialectic between didactical and adidactical situation.

Findings

The reflection about the use of the TDS graphical representation embedded in the lesson study diagram helps the reflection on the use of TDS itself to analyse lesson study. This theoretical analysis describes the process of teacher learning in lesson study and the link between their learning and the student’s. It also shows that lesson study is a good candidate for the fundamental situation of the knowledge for teaching.

Originality/value

The graphical conceptualisation of lesson study as a learning situation for teachers offers new insight about how teachers learn in lesson study.

Details

International Journal for Lesson and Learning Studies, vol. 7 no. 3
Type: Research Article
ISSN: 2046-8253

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Publication date: 24 March 2021

Katherine K. Chen and Victor Tan Chen

This volume explores an expansive array of organizational imaginaries, or understandings of organizational possibilities, with a focus on how collectivist-democratic organizations…

Abstract

This volume explores an expansive array of organizational imaginaries, or understandings of organizational possibilities, with a focus on how collectivist-democratic organizations offer alternatives to conventional for-profit managerial enterprises. These include worker and consumer cooperatives and other enterprises that, to varying degrees, (1) emphasize social values over profit; (2) are owned not by shareholders but by workers, consumers, or other stakeholders; (3) employ democratic forms of managing their operations; and (4) have social ties to the organization based on moral and emotional commitments. The contributors to this volume examine how these enterprises generate solidarity among members, network with other organizations and communities, contend with market pressures, and enhance their larger organizational ecosystems. In this introductory paper, the authors put forward an inclusive organizational typology whose continuums account for four key sources of variation – values, ownership, management, and social relations – and argue that enterprises fall between these two poles of the collectivist-democratic organization and the for-profit managerial enterprise. Drawing from this volume’s empirical studies, the authors situate these market actors within fields of competition and contestation shaped not just by state action and legal frameworks, but also by the presence or absence of social movements, labor unions, and meta-organizations. This typology challenges conventional conceptualizations of for-profit managerial enterprises as ideals or norms, reconnects past models of organizing among marginalized communities with contemporary and future possibilities, and offers activists and entrepreneurs a sense of the wide range of possibilities for building enterprises that differ from dominant models.

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Organizational Imaginaries: Tempering Capitalism and Tending to Communities through Cooperatives and Collectivist Democracy
Type: Book
ISBN: 978-1-83867-989-7

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Article
Publication date: 13 July 2015

Stéphane Clivaz

– The purpose of this paper is to present French Didactique des Mathématiques (DM) to the Lesson Study (LS) community.

296

Abstract

Purpose

The purpose of this paper is to present French Didactique des Mathématiques (DM) to the Lesson Study (LS) community.

Design/methodology/approach

This theoretical paper presents the origins of DM in the Theory of Didactical Situations (TDS) by Brousseau. It elaborates about didactical engineering, fundamental situation and other fundamental concepts. It briefly presents other Didactique theories: the theory of conceptual fields, the anthropological theory of the didactic, the joint action theory in didactics and the double approach. It considers importance of the (TDS) and influences over teaching of mathematics. This paper finishes by highlighting the ways Didactique and LS could contribute to each other in a profitable dialogue.

Findings

The paper contrasts DM with some LS main features. It highlights the parallels despite fundamental differences in the initial goals of the perspectives. It shows that these differences could lead to productive dialogue by producing more practice-oriented forms of didactical engineering for the first and making teachers’ principles for lessons more explicit for the latter.

Originality/value

The paper presents a very quick overview of the parallels between DM and LS. Additionally, this paper gives many accessible references in English for the reader to explore Didactique further.

Details

International Journal for Lesson and Learning Studies, vol. 4 no. 3
Type: Research Article
ISSN: 2046-8253

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Article
Publication date: 19 December 2024

Stéphane Clivaz, Anne Clerc-Georgy, Urs Oberthaler and Silvia Frank Schmid

This article aims to evaluate the current state and planned progress of lesson study (LS) in Switzerland, specifically focusing on the efforts made by different university teacher…

17

Abstract

Purpose

This article aims to evaluate the current state and planned progress of lesson study (LS) in Switzerland, specifically focusing on the efforts made by different university teacher education institutions across three language regions of the country.

Design/methodology/approach

First, a literature review is carried out to establish the LS research situation in Switzerland. In a second step, LS projects implemented in three different language regions across Switzerland and key findings thereof will be presented.

Findings

LS in Switzerland has progressed in terms of research, as can be seen from the publication of 18 papers from seven different universities and classified into three categories. The majority of these papers stem from the Lausanne Laboratory Lesson Study. Swiss LS has also attracted attention in some neighbouring countries. Nevertheless, the sustainability of the LS process in Switzerland is still in its infancy. Some unfavourable factors are due to the cantonal and versatile structure of the Swiss education system. However, thanks to the centre of expertise for LS at Lausanne University of Teacher Education, LS is expanding to other regions of Switzerland.

Research limitations/implications

While this paper does not delve into extensive research on the development of LS in Switzerland, it highlights the need for further research to analyse the conditions and constraints impacting the sustainability of learning communities in the country.

Originality/value

This paper represents the first literature review specifically addressing LS in Switzerland, offering a comprehensive assessment of its research development. Additionally, it is the first study to examine the development of learning communities across different language regions of the country. Moreover, it shows how LS can be implemented and adapted to the varied educational preconditions in Switzerland.

Details

International Journal for Lesson & Learning Studies, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2046-8253

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Article
Publication date: 29 April 2014

Ardavan Dargahi, Stéphane Ploix, Alireza Soroudi and Frédéric Wurtz

The use of energy storage devices helps the consumers to utilize the benefits and flexibilities brought by smart networks. One of the major energy storage solutions is using…

472

Abstract

Purpose

The use of energy storage devices helps the consumers to utilize the benefits and flexibilities brought by smart networks. One of the major energy storage solutions is using electric vehicle batteries. The purpose of this paper is to develop an optimal energy management strategy for a consumer connected to the power grid equipped with Vehicle-to-Home (V2H) power supply and renewable power generation unit (PV).

Design/methodology/approach

The problem of energy flow management is formulated and solved as an optimization problem using a linear programming model. The total energy cost of the consumer is optimized. The optimal values of decision variables are found using CPLEX solver.

Findings

The simulation results demonstrated that if the optimal decisions are made regarding the V2H operation and managing the produced power by solar panels then the total energy payments are significantly reduced.

Originality/value

The gap that the proposed model is trying to fill is the holistic determination of an optimal energy procurement portfolio by using various embedded resources in an optimal way. The contributions of this paper are in threefold as: first, the introduction of mobile storage devices with a periodical availability depending on driving schedules; second, offering a new business model for managing the generation of PV modules by considering the possibility of grid injection or self-consumption; third, considering Real Time Pricing in the suggested formulation.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 33 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 7 March 2016

Stéphane Jaumier

While a comparative study of the literature on accounting as a profession and on cooperatives reveals important differences in the values embodied by certified public accountants…

527

Abstract

Purpose

While a comparative study of the literature on accounting as a profession and on cooperatives reveals important differences in the values embodied by certified public accountants and by cooperators, the purpose of this study is to explore whether such differences lead to an insurmountable incompatibility or may possibly be mitigated and eventually overcome.

Design/methodology/approach

The study focuses on a French public accounting firm’s project to become a worker cooperative. Drawing on methodological insights from actor–network theory (ANT), the study analyses a situation in which the certified public accountants try to convince some cooperators of the merits of their project.

Findings

The case studied suggests that accounting as a profession and cooperatives are irreconcilable. It not only confirms that some of their contrasting features (identified in the literature) are indeed too difficult to overcome but also reveals a new, unforeseen source of tension between certified public accountants and cooperators.

Research limitations/implications

The study calls for further research into the so-far-overlooked relationships between accounting as a profession and cooperatives. It also proposes to extend the usage of ANT in accounting research to the study of accounting as a profession.

Originality/value

While ANT-inspired accounting research has to date shown a dominant interest in successful translation processes, the present study looks at an unsuccessful translation stage.

Details

Journal of Accounting & Organizational Change, vol. 12 no. 1
Type: Research Article
ISSN: 1832-5912

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Article
Publication date: 10 July 2018

Philip Kofi Adom, Dosse Mawussi Djahini-Afawoubo, Saidi Atanda Mustapha, Stephane Gandjon Fankem and Nghargbu Rifkatu

The agriculture sector in Africa is a major employer, but production levels have fallen short of demand. To match future demand, public investment in research and development…

317

Abstract

Purpose

The agriculture sector in Africa is a major employer, but production levels have fallen short of demand. To match future demand, public investment in research and development (R&D) is required. The purpose of this paper is to investigate how foreign direct investments (FDIs) moderate the effects of public R&D on Africa’s agricultural production.

Design/methodology/approach

This study estimates an unbalanced panel fixed effect model that consists of 28 African countries covering the period 1980–2014.

Findings

Public R&D increases production in the agriculture sector, however, the effects reverse after ten years. Though FDIs have direct positive effects on production, indirectly, it reduces the productivity potential of public R&D due to the possible dependency syndrome associated with FDIs. Traditional inputs like land, capital, and labour and good political institutions positively drive production, but adverse changes in the weather reduce production.

Practical implications

There should be a frequent update of R&D and improvement in maintenance culture. FDIs should be seen as complementary efforts, and not as substitute efforts to domestic investment efforts in R&D.

Originality/value

Insufficient domestic investment has increased the dependence on FDIs. In this regard, FDIs effect on production could be tricky since it increases the volatility in agricultural R&D. This paper contributes to the literature by examining how FDIs moderate the effects of public R&D on output.

Details

African Journal of Economic and Management Studies, vol. 9 no. 3
Type: Research Article
ISSN: 2040-0705

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Article
Publication date: 18 September 2020

Ferry Efendi, Retno Indarwati and Gading Ekapuja Aurizki

This study aimed to analyze the effect of Trauma-Focused Cognitive Behavior Therapy (TF-CBT) on the depression level and quality of life of the elderly in an earthquake-affected…

363

Abstract

Purpose

This study aimed to analyze the effect of Trauma-Focused Cognitive Behavior Therapy (TF-CBT) on the depression level and quality of life of the elderly in an earthquake-affected district of North Lombok Regency, Indonesia.

Design/methodology/approach

A Randomized Controlled Trial (RCT) with a population of two elderly groups living in an earthquake-affected district was used in this study. The intervention comprised giving TF-CBT. There were three research instruments applied to determine the variables, namely, the Clinician-Administered PTSD Scale (CAPS-5), the Geriatric Depression Scale 15 (GDS 15) and the World Health Organization Quality of Life-BREF (WHOQOL-BREF). All instruments were adopted and translated using back translation to Bahasa Indonesia, which is appropriate at the suggestion of the WHO. To investigate the effect of the intervention, we used hierarchical linear models (HLM) with intent-to-treat analysis. The patent parameter effect was tested using the Wald test (t-test) with a confidence Interval of 95 per cent.

Findings

The final analysis applied CAPS-5 and showed that there was a decrease in the PTSD of the respondents, which was down to only 8 (17.8 per cent) in the post-test. The same situation happened for the depression variable (2.8 per cent) after it was assessed using GDS-15C. The Quality of life (WHOQoL-BREF) variable was divided into Physical (50.7), Psychological (57.1), Social (53.6) and Environmental (45.7). These components show there to be a significant result in terms of improving the quality of life of the elderly victims of the earthquake. The finding highlights that applying TF-CBT in the elderly population can significantly drop post-traumatic stress disorder and depression level and enhanced quality of life.

Social implications

The intervention decreased the depression level and improved the quality of life of the elderly as found in the six- week follow-up. Longer training and integration with the structured local wisdom could be necessary to better address the mental health of the elderly affected by the earthquake. Moreover, strengthening the role of the family as the primary caregiver is required to improve the outcome.

Originality/value

This is the first study that has attempted to use TF-CBT as a method of treatment for the elderly to decrease their depression and to increase quality of life among the Indonesian elderly who have experienced an earthquake. This paper provides knowledge on the effectiveness of TF-CBT that can be used by therapists to treat depression problems suffered by the elderly in a post-disaster area.

Details

Working with Older People, vol. 24 no. 3
Type: Research Article
ISSN: 1366-3666

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