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Article
Publication date: 6 March 2017

Jerzy Zgraja and Adam Cieslak

The purpose of the research was to develop a method for the determination of temperature characteristics of thermal diffusivity and specific heat on a single and the same…

Abstract

Purpose

The purpose of the research was to develop a method for the determination of temperature characteristics of thermal diffusivity and specific heat on a single and the same stand, powered from an inverter for induction heating. Determination of the thermal diffusivity has been based on the idea of the pulse method. Searched solutions allowed to reduce inaccuracy of the pulse method when such an unusual source of pulse of energy is used.

Design/methodology/approach

Coupled electromagnetic and thermal calculations were carried out to verify proposed methods for estimating thermal properties of an induction heated charge. Presented methods were applied into a real laboratory stand and they were examined experimentally.

Findings

Achieved results of calculations allow to estimate thermal properties of the induction heated charge with 2 and 5 per cent of uncertainty, respectively, for heat capacity and thermal diffusivity. It gives possibility to use results as an input for further proceedings connected with estimation of electrical parameters in a more complex system.

Practical implications

Presented methods of estimating thermal properties of the induction heated charge were verified experimentally on a dedicated laboratory stand. It gives a practical possibility to implement previously established assumptions and examine them. This is a significant step toward the construction of an easy-to-use device for a comprehensive determination of material parameters of metals directly in the heat treatment plant.

Originality/value

This study presents a trial of implementation of induction heating as a source of energy in the impulse method for estimation of thermal properties of the material. Additionally, it presents a process of improving results achieved with the flash methods which were presented in previous papers. The method of estimation of specific heat which uses induction heating as the heat source was presented too.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 36 no. 2
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 28 November 2020

Nolwenn Lapierre, Alain St-Arnaud, Jean Meunier and Jacqueline Rousseau

Older adults are at a high risk of falling. The consequences of falls are worse when the person is unable to get up afterward. Thus, an intelligent video monitoring system…

Abstract

Purpose

Older adults are at a high risk of falling. The consequences of falls are worse when the person is unable to get up afterward. Thus, an intelligent video monitoring system (IVS) was developed to detect falls and send alerts to a respondent. This study aims to explore the implementation of the IVS at home.

Design/methodology/approach

A multiple case study was conducted with four dyads: older adults and informal caregivers. The IVS was implemented for two months at home. Perceptions of the IVS and technical variables were documented. Interviews were thematically analyzed, and technical data were descriptively analyzed.

Findings

The rate of false alarms was 0.35 per day. Participants had positive opinions of the IVS and mentioned its ease of use. They also made suggestions for improvement.

Originality/value

This study showed the feasibility of a two-month implementation of this IVS. Its development should be continued and tested with a larger experimental group.

Details

Journal of Enabling Technologies, vol. 14 no. 4
Type: Research Article
ISSN: 2398-6263

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Article
Publication date: 7 November 2018

Nolwenn Lapierre, Jean Meunier, Alain St-Arnaud and Jacqueline Rousseau

To face the challenges raised by the high incidence of falls among older adults, the intelligent video-monitoring system (IVS), a fall detection system that respects…

Abstract

Purpose

To face the challenges raised by the high incidence of falls among older adults, the intelligent video-monitoring system (IVS), a fall detection system that respects privacy, was developed. Most fall detection systems are tested only in laboratories. The purpose of this paper is to test the IVS in a simulation context (apartment-laboratory), then at home.

Design/methodology/approach

This study is a proof of concept including two phases: a simulation study to test the IVS in an apartment-laboratory (29 scenarios of activities including falls); and a 28-day pre-test at home with two young occupants. The IVS’s sensitivity (Se), specificity (Sp), accuracy (A) and error rate (E) in the apartment-laboratory were calculated, and functioning at home was documented in a logbook.

Findings

For phase 1, results are: Se =91.67 per cent, Sp =99.02 per cent, A=98.25 per cent, E=1.75. For phase 2, the IVS triggered four false alarms and some technical dysfunctions appeared (e.g. computer screen never turning off) that are easily overcome.

Practical implications

Results show the IVS’s efficacy at automatically detecting falls at home. Potential issues related to future installation in older adults’ homes were identified. This proof of concept led to recommendations about the installation and calibration of a camera-based fall detection system.

Originality/value

This paper highlights the potentialities of a camera-based fall detection system in real-world contexts and supports the use of the IVS to help older adults age in place.

Details

Journal of Enabling Technologies, vol. 12 no. 4
Type: Research Article
ISSN: 2398-6263

Keywords

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Abstract

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When Reproduction Meets Ageing
Type: Book
ISBN: 978-1-83909-747-8

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Abstract

Details

When Reproduction Meets Ageing
Type: Book
ISBN: 978-1-83909-747-8

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Abstract

Details

When Reproduction Meets Ageing
Type: Book
ISBN: 978-1-83909-747-8

Content available
Book part
Publication date: 27 May 2021

Nolwenn Bühler

Abstract

Details

When Reproduction Meets Ageing
Type: Book
ISBN: 978-1-83909-747-8

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Article
Publication date: 14 November 2016

Monali Hota and Maud Derbaix

The purpose of this paper is to examine whether children’s online play and participation in massively multiplayer online role playing games (MMORPGs) is leading to the…

Abstract

Purpose

The purpose of this paper is to examine whether children’s online play and participation in massively multiplayer online role playing games (MMORPGs) is leading to the development of virtual retail shopping motivations and behaviours. This exploratory study also examines the influence of age-related differences in children’s social and consumer development vs adults and gender on this.

Design/methodology/approach

The study was conducted using two focus groups and ten in-depth interviews with 20 French children between the ages of eight and 12 years.

Findings

Results show that children’s online play and participation in MMORPG communities is leading to the development of virtual retail shopping motivations and behaviour through the purchase of virtual tools and accessories by all children using virtual in-game money. But these motivations are very gender specific due to the overarching importance of gender-specific motivations for achievement. Boys engage in virtual retail shopping because they need in-game progress and power gains, while girls engage in virtual retail shopping because they need social status enhancement.

Research limitations/implications

Research should be conducted on children in different age groups. All aspects of the process and consequences of children’s participation in online gaming communities should be examined more comprehensively. Quantitative research is required. Results may also vary with country and cultural context.

Practical implications

First, children between eight and 12 years of age are active consumers (influencers and buyers) for all companies. MMORPGs provide the perfect setting for better understanding of children’s motivations and behaviour regarding virtual retail shopping because they provide virtual in-game money for different achievements that children use to engage in such behaviour. Second, MMORPG companies can benefit by taking into account gender differences in children’s motivations and the importance of the games’ social dimensions and interactions when designing the games.

Social implications

First, the risks of playing computer games for children in terms of playing violent games and leading a virtual life must be considered and studied carefully by public policy officials. Second, public policy officials that look into online gaming should take into account gender differences in children’s motivations and the importance of the games’ social dimensions and interactions when monitoring online games. These are issues that are not only developing children’s abilities as social actors but may well be promoting excessive materialism aided by the formation of online peer groups.

Originality/value

This is the first study on children’s online play and participation in MMORPGs in the consumer context and will help us to understand children’s mind-set and motivations for retail activities in this unique retail setting. The study results show that children’s online play and participation in MMORPGs is leading to the development of virtual retail shopping motivations and behaviour that are very gender specific unlike adults.

Details

International Journal of Retail & Distribution Management, vol. 44 no. 11
Type: Research Article
ISSN: 0959-0552

Keywords

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