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Article
Publication date: 17 September 2018

Piezoresistive strain sensor array using polydimethylsiloxane-based conducting nanocomposites for electronic skin application

Yung Sin Chong, Keat Hoe Yeoh, Pei Ling Leow and Pei Song Chee

This paper aims to report a stretchable piezoresistive strain sensor array that can detect various static and dynamic stimuli, including bending, normal force, shear…

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Abstract

Purpose

This paper aims to report a stretchable piezoresistive strain sensor array that can detect various static and dynamic stimuli, including bending, normal force, shear stress and certain range of temperature variation, through sandwiching an array of conductive blocks, made of multiwalled carbon nanotubes (MWCNTs) and polydimethylsiloxane (PDMS) composite. The strain sensor array induces localized resistance changes at different external mechanical forces, which can be potentially implemented as electronic skin.

Design/methodology/approach

The working principle is the piezoresistivity of the strain sensor array is based on the tunnelling resistance connection between the fillers and reformation of the percolating path when the PDMS and MWCNT composite deforms. When an external compression stimulus is exerted, the MWCNT inter-filler distance at the conductive block array reduces, resulting in the reduction of the resistance. The resistance between the conductive blocks in the array, on the other hand, increases when the strain sensor is exposed to an external stretching force. The methodology was as follows: Numerical simulation has been performed to study the pressure distribution across the sensor. This method applies two thin layers of conductive elastomer composite across a 2 × 3 conductive block array, where the former is to detect the stretchable force, whereas the latter is to detect the compression force. The fabrication of the strain sensor consists of two main stages: fabricating the conducting block array (detect compression force) and depositing two thin conductive layers (detect stretchable force).

Findings

Characterizations have been performed at the sensor pressure response: static and dynamic configuration, strain sensing and temperature sensing. Both pressure and strain sensing are studied in terms of the temporal response. The temporal response shows rapid resistance changes and returns to its original value after the external load is removed. The electrical conductivity of the prototype correlates to the temperature by showing negative temperature coefficient material behaviour with the sensitivity of −0.105 MΩ/°C.

Research limitations/implications

The conductive sensor array can potentially be implemented as electronic skin due to its reaction with mechanical stimuli: compression and stretchable pressure force, strain sensing and temperature sensing.

Originality/value

This prototype enables various static and dynamic stimulus detections, including bending, normal force, shear stress and certain range of temperature variation, through sandwiching an array of conductive blocks, made of MWCNT and PDMS composite. Conventional design might need to integrate different microfeatures to perform the similar task, especially for dynamic force sensing.

Details

Sensor Review, vol. 38 no. 4
Type: Research Article
DOI: https://doi.org/10.1108/SR-11-2017-0238
ISSN: 0260-2288

Keywords

  • Conducting polymer
  • Electronic skin
  • Piezoresistive sensing

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Article
Publication date: 7 August 2017

Size, trading volume, and the profitability of technical trading

Yung-Ho Chang, Chia-Ching Jong and Sin-Chong Wang

The purpose of this paper is to evaluate the profitability of technical trading relative to buy-and-hold (BH) strategy at firm level, controlling for firm size and trading volume.

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Abstract

Purpose

The purpose of this paper is to evaluate the profitability of technical trading relative to buy-and-hold (BH) strategy at firm level, controlling for firm size and trading volume.

Design/methodology/approach

This paper applies variable-length moving averages (VMAs) thoroughly to each and every stock listed on Taiwan Stock Exchange (TWSE) and computes the excess returns of technical trading relative to BH strategy. The samples are further grouped by firm size and trading volume. Furthermore, possible data snooping bias is investigated by employing Hansen’s (2005) Superior Predictive Ability tests.

Findings

The result shows that VMAs outperform the BH strategy. The profitability of VMAs, remarkably, is positively associated with size and trading volume. After correcting for data snooping bias, VMAs with longer moving averages outperform VMAs with shorter moving averages. The evidence suggests that size and volume information is accountable for trend projection.

Originality/value

Unlike past studies simply applying technical trading rules to market indices, portfolios, or selected stocks, this paper evaluates the profitability of technical trading by applying VMAs comprehensively to each and every individual stock listed on TWSE controlling for the effect of firm size and trading volume, providing more practical insights for trading individual stocks.

Details

International Journal of Managerial Finance, vol. 13 no. 4
Type: Research Article
DOI: https://doi.org/10.1108/IJMF-09-2016-0179
ISSN: 1743-9132

Keywords

  • Trading volume
  • Technical trading
  • Firm size
  • Superior predictive ability
  • G11
  • G12

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Article
Publication date: 2 December 2010

Growing up with a parent with schizophrenia: what children say they need

Siu Chan and Ying Heidi

Despite the rich literature on the effects of parental mental health problems on child development, the needs of children of mentally ill parents have been overlooked in…

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Abstract

Despite the rich literature on the effects of parental mental health problems on child development, the needs of children of mentally ill parents have been overlooked in both research and services. This study investigated the needs of a neglected group, namely Chinese adolescent children of parents with schizophrenia, in order to gain insights into the design of programmes for these adolescents. In‐depth interviews were conducted individually with five Chinese adolescent girls whose mother or father was diagnosed with schizophrenia. Analysis of the interview data revealed four common themes: stigma and discrimination; mixed feelings of love and anger; the role of being a carer; and positive gains. The results shed light on the importance of taking cultural context into consideration when providing services for these children and further conducting research in this area. Although mental health problems are regarded as a taboo and associated with shame in Chinese culture, these children, out of a respect for their parents (‘filial piety’1), showed a strong sense of loyalty to their parents and suppressed their anger and sorrow for their parents' sake. Implications for social services for children whose parents have mental health problems and suggestions for future research are discussed.

Details

Journal of Children's Services, vol. 5 no. 4
Type: Research Article
DOI: https://doi.org/10.5042/jcs.2010.0693
ISSN: 1746-6660

Keywords

  • Schizophrenia
  • Mental health problems
  • Parents
  • Stigma
  • Young carer
  • Chinese culture

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Article
Publication date: 1 November 1997

Aid Dependence and The Structure Of Corruption: The Case of Post‐Korean War South Korea

John Lie

From 1953 to 1961, the South Korean economy grew slowly; the average per capita GNP growth was a mere percent, amounting to less than $100 in 1961. Few people, therefore…

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Abstract

From 1953 to 1961, the South Korean economy grew slowly; the average per capita GNP growth was a mere percent, amounting to less than $100 in 1961. Few people, therefore, look for the sources of later dynamism in this period. As Kyung Cho Chung (1956:225) wrote in the mid‐1950s: “[South Korea] faces grave economic difficulties. The limitations imposed by the Japanese have been succeeded by the division of the country, the general destruction incurred by the Korean War, and the attendant dislocation of the population, which has further disorganized the economy” (see also McCune 1956:191–192). T.R. Fehrenbach (1963:37), in his widely read book on the Korean War, prognosticated: “By themselves, the two halves [of Korea] might possibly build a viable economy by the year 2000, certainly not sooner.”

Details

International Journal of Sociology and Social Policy, vol. 17 no. 11/12
Type: Research Article
DOI: https://doi.org/10.1108/eb013331
ISSN: 0144-333X

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Article
Publication date: 1 February 2004

The formation of owners’ corporations in Hong Kong’s private housing estates: A probit evaluation of Mancur Olson’s group theory

Lawrence Wai‐Chung Lai and Pearl Yik‐Long Chan

This paper uses a probit model to analyse 100 observations in terms of three hypotheses about the formation of owners’ corporations in high‐density private housing estates…

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Abstract

This paper uses a probit model to analyse 100 observations in terms of three hypotheses about the formation of owners’ corporations in high‐density private housing estates in Hong Kong within the context of Mancur Olson’s group theory. The findings do not reject the theory, revealing that it is more likely for an older urban estate with fewer owners to form owners’ corporations. The discussion includes a brief introduction to Olson’s group theory and the development of the probit analysis. Some speculative thoughts about public participation in local level urban management and planning are offered in the conclusion.

Details

Property Management, vol. 22 no. 1
Type: Research Article
DOI: https://doi.org/10.1108/02637470410525491
ISSN: 0263-7472

Keywords

  • Group theory
  • Transaction costs
  • Property management
  • Hong Kong

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Book part
Publication date: 20 July 2012

Beyond the State: Legitimatizing Gender Equity in Education in Taiwan

Shu-Ching Lee

Purpose and methodology – Focusing on the policy contexts of gender education in Taiwan, this chapter uses data from interviews with elite policymakers and policy…

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Abstract

Purpose and methodology – Focusing on the policy contexts of gender education in Taiwan, this chapter uses data from interviews with elite policymakers and policy documents to examine how feminist activists sought to legitimatize gender equity in education in the wake of the comprehensive social and educational reforms of the 1990s and early years of this decade.

Findings – The embedding of gender in education did not follow a smooth path in terms of policy formulation. Feminist activists drove the process of reform by retaining control over the naming of the legislation, and its wording, thus preserving the language and imperatives of gender equity.

Social implications – In this chapter, I examine the formation of the Gender Equity Education Law, detailing the struggles, contentions, and negotiations that underlay the eventual approval of gender reform in education.

Originality/value of chapter – The chapter contributes significantly by identifying the necessity to recognize the nature of the state and its relations with society in order to research gender in education in Taiwan.

Details

Social Production and Reproduction at the Interface of Public and Private Spheres
Type: Book
DOI: https://doi.org/10.1108/S1529-2126(2012)0000016015
ISBN: 978-1-78052-875-5

Keywords

  • Gender equity
  • education
  • legislation
  • women's movements
  • Taiwan

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