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Article
Publication date: 29 September 2023

Xu Hao, Lang Wei, Yue Qiao, Shengzui Xu, Jian Bin Liao, Yu Xi, Wang Wei and Zhi-Wei Liu

The computing power of the legged robot is not enough to perform high-frequency updates for the full-body model predictive control (MPC) of the robot, which is a common problem…

213

Abstract

Purpose

The computing power of the legged robot is not enough to perform high-frequency updates for the full-body model predictive control (MPC) of the robot, which is a common problem encountered in the gait research of the legged robot. The purpose of this paper is to propose a high-frequency MPC control method for the bounding gait of a parallel quadruped robot.

Design/methodology/approach

According to the bounding gait characteristics of the robot, the quadruped robot model is simplified to an equivalent plane bipedal model. Under the biped robot model, the forces between the robot’s feet and the ground are calculated by MPC. Then, the authors apply a proportional differential controller to distribute these forces to the four feet of the quadruped robot. The robot video can be seen at www.bilibili.com/video/BV1je4y1S7Rn.

Findings

To verify the feasibility of the controller, a prototype was made, and the controller was deployed on the actual prototype and then fully analyzed through experiments. Experiments show that the update frequency of MPC could be stabilized at 500 Hz while the robot was running in the bounding gait stably and efficiently.

Originality/value

This paper proposes a high-frequency MPC controller under the simplified model, which has a higher working efficiency and more stable control performance.

Details

Industrial Robot: the international journal of robotics research and application, vol. 50 no. 6
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 29 September 2023

Yue Qiao, Wang Wei, Yunxiang Li, Shengzui Xu, Lang Wei, Xu Hao and Re Xia

The purpose of this paper is to introduce a motion control method for WFF-AmphiRobot, which can effectively realize the flexible motion of the robot on land, underwater and in the…

194

Abstract

Purpose

The purpose of this paper is to introduce a motion control method for WFF-AmphiRobot, which can effectively realize the flexible motion of the robot on land, underwater and in the transition zone between land and water.

Design/methodology/approach

Based on the dynamics model, the authors selected the appropriate state variables to construct the state space model of the robot and estimated the feedback state of the robot through the maximum a posteriori probability estimation. The nonlinear predictive model controller of the robot is constructed by local linearization of the model to perform closed-loop control on the overall motion of the robot. For the control problem of the terminal trajectory, using the neural rhythmic movement theory in bionics to construct a robot central pattern generator (CPG) for real-time generation of terminal trajectory.

Findings

In this paper, the motion state of WFF-AmphiRobot is estimated, and a model-based overall motion controller for the robot and an end-effector controller based on neural rhythm control are constructed. The effectiveness of the controller and motion control algorithm is verified by simulation and physical prototype motion experiments on land and underwater, and the robot can ideally complete the desired behavior.

Originality/value

The paper designed a controller for WFF-AmphiRobot. First, when constructing the robot state estimator in this paper, the robot dynamics model is introduced as the a priori estimation model, and the error compensation of the a priori model is performed by the method of maximum a posteriori probability estimation, which improves the accuracy of the state estimator. Second, for the underwater oscillation motion characteristics of the flipper, the Hopf oscillator is used as the basis, and the flipper fluctuation equation is modified and improved by the CPG signal is adapted to the flipper oscillation demand. The controller effectively controls the position error and heading angle error within the desired range during the movement of the WFF-AmphiRobot.

Details

Industrial Robot: the international journal of robotics research and application, vol. 50 no. 6
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 19 September 2023

Nik Mohd Hazrul Nik Hashim, Nor Rahimy Khalid, Suraya Akmar Mokhtaruddin, Abdullah Al Mamun and Mohammed Abdur Razzaque

Researchers have paid little attention to elucidating how customer-perceived innovative apparel attributes are linked to brand reputation and consumer buying behaviors. This study…

917

Abstract

Purpose

Researchers have paid little attention to elucidating how customer-perceived innovative apparel attributes are linked to brand reputation and consumer buying behaviors. This study intends to bridge that gap by providing empirical evidence on the effects of product novelty, product difference and product inimitability on brand reputation and behavioral intentions in the context of garment purchasing. We also investigate the moderating effects of self-congruity and value consciousness on the attribute‒brand reputation linkages, as well as their immediate influence on the domain variables.

Design/methodology/approach

The proposed model was estimated using data from a web-based survey of 299 female apparel customers. Structural equation modeling was employed to test the relationships between variables.

Findings

The results indicate that product novelty, product inimitability, self-congruity and value consciousness significantly influence brand reputation. The results also demonstrate that self-congruity, value consciousness and brand reputation have direct effects on behavioral intention, while self-congruity and value consciousness appear to moderate the relationship between innovative product attributes and brand reputation.

Originality/value

This study is the first to present a conceptual model that systematically encompasses product innovation, brand perceptions and behavioral links in the field of women's clothing. The findings have important implications for both academics and practitioners in the field of fashion marketing.

Details

Journal of Fashion Marketing and Management: An International Journal, vol. 28 no. 2
Type: Research Article
ISSN: 1361-2026

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Book part
Publication date: 8 June 2020

David Truswell

An overview of the impact of dementia that focuses on underdeveloped countries across the globe, and migrant and minority ethnic communities within the developed world. Increased…

Abstract

An overview of the impact of dementia that focuses on underdeveloped countries across the globe, and migrant and minority ethnic communities within the developed world. Increased longevity increases the risk of dementia and brings new challenges in terms of cultural perspectives and cultural obligations in the care of elders. The chapter examines these challenges in detail and their consequences in planning for support and care.

Details

The International Handbook of Black Community Mental Health
Type: Book
ISBN: 978-1-83909-965-6

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Article
Publication date: 27 February 2023

Jin Su, Md Arif Iqbal, Farhan Haque and Maeen Md Khairul Akter

This study aims to understand Bangladeshi young consumers’ perceptions of sustainable apparel. Specifically, through the lens of the theory of reasoned action (TRA), this study…

586

Abstract

Purpose

This study aims to understand Bangladeshi young consumers’ perceptions of sustainable apparel. Specifically, through the lens of the theory of reasoned action (TRA), this study investigates the impacts of man–nature orientation (MNO) and social influences on Bangladeshi young consumers’ intention to purchase sustainable apparel.

Design/methodology/approach

Empirical survey-based research was conducted, and data were collected from 387 Bangladeshi college students.

Findings

The findings of the study show that MNO significantly influences Bangladeshi young consumers’ attitudes toward purchasing sustainable apparel, which, together with social influences, impacts young Bangladeshi consumers’ intention of making efforts to purchase sustainable apparel.

Originality/value

This study incorporates the specific cultural value – MNO with the traditional TRA model to understand young Bangladeshi consumers’ sustainable apparel purchase intention. The results of this study demonstrate the applicability of the TRA framework in understanding young consumers’ sustainable apparel consumer behavior in the context of Bangladesh, which is a developing country with a collectivistic culture. This study provides insights into how apparel brands and retailers should design their sustainability strategies in developing countries such as Bangladesh.

Details

Social Responsibility Journal, vol. 19 no. 9
Type: Research Article
ISSN: 1747-1117

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Article
Publication date: 24 January 2019

Ilias O. Pappas, Patrick Mikalef, Michail N. Giannakos and Panos E. Kourouthanassis

In the complex ecosystem of mobile applications multiple factors have been used to explain users’ behavior, without though focusing on how different combinations of variables may…

2012

Abstract

Purpose

In the complex ecosystem of mobile applications multiple factors have been used to explain users’ behavior, without though focusing on how different combinations of variables may affect user behavior. The purpose of this paper is to show how price value, game content quality, positive and negative emotions, gender and gameplay time interact with each other to predict high intention to download mobile games.

Design/methodology/approach

Building on complexity theory, the authors present a conceptual model followed by research propositions. The propositions are empirically validated through configurational analysis, employing fuzzy-set qualitative comparative analysis (fsQCA) on 531 active users of mobile games.

Findings

Findings identify ten solutions that explain high intention to download mobile games. Alternative paths are identified depending on the gender and the time users spend playing mobiles games. The authors highlight the role of price value and game content quality, as well as that of positive emotions, which are always core factors when present.

Originality/value

To identify complex interactions among the variables of interest, fsQCA is employed, differentiating from traditional studies using variance-based methods, leading to multiple solutions explaining the same outcome. None of the variables explains the intention to download on its own, but only when they combine with each other. The authors extend existing knowledge on how price value, game content quality, emotions, gender and gameplay time combine to lead to high intention to download mobile games; and present a methodology for how to bridge complexity theory with fsQCA, improving our understanding of intention to adopt mobile applications.

Details

Internet Research, vol. 29 no. 2
Type: Research Article
ISSN: 1066-2243

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Article
Publication date: 15 August 2016

Mingyuan Guo and Xu Wang

– The purpose of this paper is to analyse the dependence structure in volatility between Shanghai and Shenzhen stock market in China based on high-frequency data.

402

Abstract

Purpose

The purpose of this paper is to analyse the dependence structure in volatility between Shanghai and Shenzhen stock market in China based on high-frequency data.

Design/methodology/approach

Using a multiplicative error model (hereinafter MEM) to describe the margins in volatility of China’s Shanghai and Shenzhen stock market, this study adopts static and time-varying copulas, respectively, estimated by maximum likelihood estimation method to describe the dependence structure in volatility between Shanghai and Shenzhen stock market in China.

Findings

This paper has identified the asymmetrical dependence structure in financial market volatility more precisely. Gumbel copula could best fit the empirical distribution as it can capture the relatively high dependence degree in the upper tail part corresponding to the period of volatile price fluctuation in both static and dynamic view.

Originality/value

Previous scholars mostly use GARCH model to describe the margins for price volatility. As MEM can efficiently characterize the volatility estimators, this paper uses MEM to model the margins for the market volatility directly based on high-frequency data, and proposes a proper distribution for the innovation in the marginal models. Then we could use copula-MEM other than copula-GARCH model to study on the dependence structure in volatility between Shanghai and Shenzhen stock market in China from a microstructural perspective.

Details

China Finance Review International, vol. 6 no. 3
Type: Research Article
ISSN: 2044-1398

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Article
Publication date: 29 March 2023

Shan Peng, Ranran Yang, Binglong Lei, Yun Gao, Renhua Chen, Xiaohong Xia and Kevin P. Homewood

This paper aims to systematically demonstrate a methodology to determine the relative and absolute encapsulation efficiencies (αRe and αAb) for thermally- and chemically-robust…

35

Abstract

Purpose

This paper aims to systematically demonstrate a methodology to determine the relative and absolute encapsulation efficiencies (αRe and αAb) for thermally- and chemically-robust inorganic pigments, typically like ZrSiO4-based pigments, thereby enhancing their coloring performance.

Design/methodology/approach

The authors designed a route, surplus alkali-decomposition and subsequently strong-acid dissolution (SAD2) to completely decompose three classic zircon pigments (Pr–ZrSiO4, Fe2O3@ZrSiO4 and CdS@ZrSiO4) into clear solutions and preferably used inductively coupled plasma-optical emission spectrometry (ICP-OES) to determine the concentrations of host elements and chromophores, thereby deriving the numeric data and interrelation of αRe and αAb.

Findings

Zircon pigments can be thoroughly decomposed into some dissoluble zirconate–silicate resultants by SAD2 at a ratio of the fluxing agent to pigment over 6. ICP-OES is proved more suitable than some other quantification techniques in deriving the compositional concentrations, thereby the values of αRe and αAb, and their transformation coefficient KRA, which maintains stably within 0.8–0.9 in Fe2O3@ZrSiO4 and CdS@ZrSiO4 and is slightly reduced to 0.67–0.85 in Pr–ZrSiO4.

Practical implications

The SAD2 method and encapsulation efficiencies are well applicable for both zircon pigments and the other pigmental or non-pigmental inhomogeneous systems in characterizing their accurate composition.

Originality/value

The authors herein first proposed strict definitions for the relative and absolute encapsulation efficiencies for inorganic pigments, developed a relatively stringent methodology to determine their accurate values and interrelation.

Details

Pigment & Resin Technology, vol. 53 no. 5
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 26 May 2021

Vincent Wong

This article explores the roles and the expertise of Hong Kong in the internationalization of public administration education.

197

Abstract

Purpose

This article explores the roles and the expertise of Hong Kong in the internationalization of public administration education.

Design/methodology/approach

The methodology is based on the data of 5 internationalization initiatives of one Hong Kong university with its internationalization partners in Macau, Korea, Australia, Russia and Finland. The data obtained lasted for a period of 18 months, from September 2019 to March 2021.

Findings

The finding of this study revealed that (1) there are 5 “pubtropolis roles” (roles of a public administration metropolis) of Hong Kong in the internationalization of public administration education in China, Asia, Asia-Pacific, Belt-and-Road and Europe. The findings also revealed that (2) Hong Kong served as a pubtropolis with its “5C” expertise in curriculum innovation, customized training, competence framework, competence assessment and comparative policy.

Research limitations/implications

As the methodology of this article is based on the data of 5 internationalization initiatives of one Hong Kong university by one academia only, further studies can be conducted at department, faculty or university level for multiple academia.

Practical implications

There are two practical implications: (1) The more the roles of a city, the broader the view in its internationalization of public administration initiatives; (2) Hong Kong could further tap on its expertise in “5C” in public administration: curriculum innovation, customized training, competence framework, competence assessment and comparative policy to exert its “geo-management” power.

Social implications

This article argues that public services can be improved by the setting up of “Sabbatical Leave Scheme for Internationalization of Public Administration” by respective governments to sustain the impacts observed.

Originality/value

It is from the author's original work.

Details

Asian Education and Development Studies, vol. 11 no. 1
Type: Research Article
ISSN: 2046-3162

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Book part
Publication date: 5 August 2011

Yu-Hsuan Lin

Purpose – Recent research on the gender culture and femininity of adolescent girls found that girls construct their gender identity in various ways that are intertwined with race…

Abstract

Purpose – Recent research on the gender culture and femininity of adolescent girls found that girls construct their gender identity in various ways that are intertwined with race, ethnicity, social class, and sexual orientation. However, these existing studies focused on either general schoolgirls (see Ali, S. (2003). To be a girl: Culture and class in schools. Gender and Education, 15(3), 269–283; Bettie (2003); Weiler, J. D. (2000). Codes and contradictions: Race, gender identity and schooling. Albany, NY: State University of New York Press; Renold, E. (2005). Girls, boys and junior sexualities: Exploring children's gender and sexual relations in the primary school. London: Routledge) or delinquent girls in a gang (see Miller, J. (1998). Gender and victimization risk among young women in gangs. Journal of Research in Crime and Delinquency, 35, 429–453; Miller (2001); Joe-Laidler & Hunt (2001); Schalet, A., Hunt, G., & Joe-Laidler, K. (2003). Respectability and autonomy: The articulation and meaning of sexuality among the girls in the gang. Journal of Contemporary Ethnography, 32, 108–143; Messerschmidt (1995); Messerschmidt, J. W. (1997). Crime as structured action: Gender, race, class, and crime in the making. Thousand Oaks, CA: Sage), and only a few studies paid attention to girls who showed overt oppositional behaviors at school.

Methods – The research uses qualitative methods and explores the gender identity of two adolescent girls in a junior high school in Taiwan, who are regarded as problem or “bad” girls by the school faculty.

Results – The two girls both manifested “ladette” culture (Jackson, 2006). On the one hand, they showed masculine behaviors such as fighting, troublemaking, disobeying school regulations, and using drugs and alcohol. On the other hand, they deliberately emphasized their femininity and sexual maturity in the way they dressed, talked, and behaved.

Details

The Well-Being, Peer Cultures and Rights of Children
Type: Book
ISBN: 978-1-78052-075-9

Keywords

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