Huiyu Sun, Guangming Song, Zhong Wei and Ying Zhang
This paper aims to tele-operate the movement of an unmanned aerial vehicle (UAV) in the obstructed environment with asymmetric time-varying delays. A simple passive proportional…
Abstract
Purpose
This paper aims to tele-operate the movement of an unmanned aerial vehicle (UAV) in the obstructed environment with asymmetric time-varying delays. A simple passive proportional velocity errors plus damping injection (P-like) controller is proposed to deal with the asymmetric time-varying delays in the aerial teleoperation system.
Design/methodology/approach
This paper presents both theoretical and real-time experimental results of the bilateral teleoperation system of a UAV for collision avoidance over the wireless network. First, a position-velocity workspace mapping is used to solve the master-slave kinematic/dynamic dissimilarity. Second, a P-like controller is proposed to ensure the stability of the time-delayed bilateral teleoperation system with asymmetric time-varying delays. The stability is analyzed by the Lyapunov–Krasovskii function and the delay-dependent stability criteria are obtained under linear-matrix-inequalities conditions. Third, a vision-based localization is presented to calibrate the UAV’s pose and provide the relative distance for obstacle avoidance with a high accuracy. Finally, the performance of the teleoperation scheme is evaluated by both human-in-the-loop simulations and real-time experiments where a single UAV flies through the obstructed environment.
Findings
Experimental results demonstrate that the teleoperation system can maintain passivity and collision avoidance can be achieved with a high accuracy for asymmetric time-varying delays. Moreover, the operator could tele-sense the force reflection to improve the maneuverability in the aerial teleoperation.
Originality/value
A real-time bilateral teleoperation system of a UAV for collision avoidance is performed in the laboratory. A force and visual interface is designed to provide force and visual feedback of the slave environment to the operator.
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Servet Soyguder and Tayfun Abut
This study attempts to control the movement of industrial robots with virtual and real-time variable time delay. The improved variable wave method was used for analyzing position…
Abstract
Purpose
This study attempts to control the movement of industrial robots with virtual and real-time variable time delay. The improved variable wave method was used for analyzing position tracking performance and stability of the system.
Design/methodology/approach
This study consists of both theoretical and real-time operations. Teleoperation systems that provide information about point or environment that people cannot reach and are one of the important robotic works that include the human–machine interaction technology were used to obtain the necessary data. Robots, as the simulated virtual environment to achieve real behaviors, were found to be important for the identification of damage that may occur during the tests performed by real robots and then in terms of prevention of errors identified in algorithm development stages.
Findings
The position and speed controls of the real–virtual–real robots consist of the teleoperation system. Also, in this study, the virtual environment was created; variable time delay motion control with teleoperation was performed and applied in the simulation and real-time environment; and the performance results were analyzed.
Originality/value
The teleoperation system created in the laboratory consists of a six-degree-of-freedom (dof) master robot, six-dof industrial robot and six-dof virtual robot. A visual interface is designed to provide visual feedback of the virtual robot’s movements to the user.
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The initial shock of devaluing the currency, after so many promises that it would not take place, has passed; only the uncertainty and apprehension remain. It seems an idle…
Abstract
The initial shock of devaluing the currency, after so many promises that it would not take place, has passed; only the uncertainty and apprehension remain. It seems an idle exercise to compare the present state of the country's economy with other periods in recent history, such as when in the first Labour Government, we went off the gold standard; at that time, shock was indeed profound and again, the French were cock‐a‐hoop, but the position was complicated by the huge inter‐indebtedness of the Allies in the First War. Or the first devaluation after the Second World War, but both periods were also characterized by public waste and profligate spending. Now, we have to obtain foreign loans and financial backing to keep going, and it is this aspect of the present devaluation which will probably far outweigh any positive advantages. The country's massive external debts were increased by approximately one‐seventh overnight, probably wiping out completely all the repayments made at such great effort since the War. Devaluation of the currency cannot be seen as anything but a grievous blow to the country, presaging hard times ahead for everyone. When promises were being made that devaluation would not take place, there can be little doubt that these were honestly made and, at the time, believed in, for no Government of a country with imports always exceeding exports, would impose such a burden on its people willingly. It must then have been forced upon them.
Purpose of This Chapter: This study explores the positive chain effects of Employee-Centered CSR (ECCSR) in harmonizing the current challenges of The Great Resignation from the…
Abstract
Purpose of This Chapter: This study explores the positive chain effects of Employee-Centered CSR (ECCSR) in harmonizing the current challenges of The Great Resignation from the perspective of employees’ well-being.
Design / Methodology / Approach: The quantitative approach was used to test the proposed research model by using a self-responded questionnaire. Purposive judgemental sampling was applied to qualify the respondents based on the criteria that they are gainfully employed now and during the pandemic. The responses gathered were analyzed using structural equation modelling (SEM).
Findings: The findings show that ECCSR significantly and positively influences employees’ well-being, specifically workplace well-being (β = 0.793), social well-being (β = 0.761), psychological well-being (β = 0.712), and subjective well-being (β = 0.611). The PLSpredict results reveal that the proposed research model possesses the predictive relevance of ECCSR in reflecting the reality of employees’ well-being.
Research Limitations: The data were collected in the post-pandemic phase to capture the employees’ state of mind. Hence, the findings may not represent the normal business cycle challenges.
Practical Implications: The empirical evidence suggests that depressing organizations to consider implementing ECCSR for employees’ well-being which in turn enables the organizations to navigate through turbulent times a little easier.
Originality: The novelty of this study is attributed to the positive and detailed findings of ECCSR in the context of employee well-being for organizational resilience.
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Lucas Casonato and Eduardo Angeli
The chapter aims to enhance the understanding of the development of Kirzner’s theory of entrepreneurship. To do so, elements in Kirzner’s works published up until 1973 that…
Abstract
The chapter aims to enhance the understanding of the development of Kirzner’s theory of entrepreneurship. To do so, elements in Kirzner’s works published up until 1973 that enclose the central points of this theory are studied. The chapter has four sections, in addition to the introduction and conclusion, that highlight the arguments that relate to Kirzner’s theory of entrepreneurship: (i) before the publication of his 1967 paper that presents the entrepreneurial function in the market process (1960–1967); between the 1967 paper and the publication of his most important book, Competition and Entrepreneurship, in 1973 (1967–1973); (iii) in Kirzner’s latest version of entrepreneurship theory as presented in his 1973 book; and (iv) the evolution of Kirzner’s thinking. The evolution of the author’s thinking regarding equilibrium and the entrepreneur is highlighted by presenting the different stages of his theory of entrepreneurship between 1960 and 1973.
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This chapter examines symphysiotomy in twentieth-century Ireland as one example of a systematized obstetric violence that has characterized Ireland’s modern history. Expanding…
Abstract
This chapter examines symphysiotomy in twentieth-century Ireland as one example of a systematized obstetric violence that has characterized Ireland’s modern history. Expanding scholarly interpretations of state- and Church-inflicted abuse of women in the twentieth century, this analysis establishes the medical profession as a central actor alongside the twentieth-century state-Church coalition that regulated women’s reproductive lives and engaged in systematic repression. This chapter recognizes that Ireland’s history of reproductive abuse and coercion did not just involve contraception or abortion but also labor and birth experiences. In addition, it offers a more complete and complex interpretation of obstetric violence by highlighting the experiences of married women with wanted pregnancies; almost all research to date focuses on the experiences of unmarried pregnant women or unwanted pregnancies. This examination of symphysiotomy and obstetric violence in Ireland illuminates the ways in which religious, national, and medical power has been mapped on women’s reproductive bodies, particularly in the decades after independence in 1922. It also makes essential links between Ireland’s past and present, demonstrating that a careful analysis of the history of obstetric violence and the religious underpinnings of it are essential in understanding Ireland today. With this research, we also place symphysiotomy within the context of the global reproductive justice movement, asking how a reproductive justice framework – one that links reproductive rights with social justice – can help us interpret obstetric violence and address the wounds of Ireland’s past.
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Mathew James Collier and David Sarpong
We explore the intersection of Catholic social teaching (CST) and entrepreneurship studies which has seemingly evaded scholars’ attention.
Abstract
Purpose
We explore the intersection of Catholic social teaching (CST) and entrepreneurship studies which has seemingly evaded scholars’ attention.
Design/methodology/approach
We integrate and expand upon prior work to explicate an integrative framework for examining CST and entrepreneurship studies.
Findings
We articulate the mechanisms through which CST and entrepreneurship studies may extend our understanding of the economic paradigm of entrepreneurship studies.
Originality/value
We explicate the economic paradigm of entrepreneurship studies and present the key reasons for Catholicism’s and CST’s exclusion to demonstrate why this is unjustified. Beyond expounding what we mean by CST, we extend the economic paradigm by an application to show why the economic paradigm is flawed and call for more CST-focussed entrepreneurship studies.
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Ron VanFleet, Virginia Gatcheff Gehrig, Robert White, Russ Thompson, Margaret Bauer, Christine Nowicki, Alicia Spong and Sherry Winters
Brodart Automation offers a wide range of services and products from microcomputer to online. In July 1985, Brodart introduced the first CD‐ROM‐based public access catalog, which…
Abstract
Brodart Automation offers a wide range of services and products from microcomputer to online. In July 1985, Brodart introduced the first CD‐ROM‐based public access catalog, which was designed to compete with COM and online catalogs. Currently, Brodart is applying its creativity to adapting library services to global networks. Its vision and commitment are reflected in the team approach to product development and support.