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Article
Publication date: 28 August 2024

Jingxuan Chai, Jie Mei, Youmin Gong, Weiren Wu, Guangfu Ma and Guoming Zhao

Asteroids have the characteristics of noncooperative, irregular gravity and complex terrain on the surface, which cause difficulties in successful landing for conventional…

55

Abstract

Purpose

Asteroids have the characteristics of noncooperative, irregular gravity and complex terrain on the surface, which cause difficulties in successful landing for conventional landers. The purpose of this paper is to study the trajectory tracking problem of a multi-node flexible lander with unknown flexible coefficient and space disturbance.

Design/methodology/approach

To facilitate the stability analysis, this paper constructs a simplified dynamic model of the multi-node flexible lander. By introducing the nonlinear transformation, a concurrent learning-based adaptive trajectory tracking guidance law is designed to ensure tracking performance, which uses both real-time information and historical data to estimate the parameters without persistent excitation (PE) conditions. A data selection algorithm is developed to enhance the richness of historical data, which can improve the convergence rate of the parameter estimation and the guidance performance.

Findings

Finally, Lyapunov stability theory is used to prove that the unknown parameters can converge to their actual value and, meanwhile, the closed-loop system is stable. The effectiveness of the proposed algorithm is further verified through simulations.

Originality/value

This paper provides a new design idea for future asteroid landers, and a trajectory tracking controller based on concurrent learning and preset performance is first proposed.

Details

Aircraft Engineering and Aerospace Technology, vol. 96 no. 9
Type: Research Article
ISSN: 1748-8842

Keywords

Available. Content available
Article
Publication date: 31 August 2010

Check-Teck Foo

556

Abstract

Details

Chinese Management Studies, vol. 4 no. 3
Type: Research Article
ISSN: 1750-614X

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Article
Publication date: 16 August 2021

Mengxi Yang, Wansi Chen, Qingyu Zhou, Baiyin Yang and Cheng Xu

China after 1949, especially since entering the 21st century, significant progress has been made in leadership research under Chinese context. However, so far there has been no…

622

Abstract

Purpose

China after 1949, especially since entering the 21st century, significant progress has been made in leadership research under Chinese context. However, so far there has been no systematic review and prospect of China's leadership research in the past 70 years. Therefore, with the help of scientific visualization software Citespace, this paper analyzes the research papers on leadership in the context of China from the top international journals of management science and applied psychology (1949–2018), supplemented and verified the previous research conclusions based on qualitative review, and quantitatively demonstrated the research evolution of leadership field.

Design Methodology Approach

Using a scientific visualization tool CiteSpace and 145 international leadership works, which were published in 64 top international journals and collected from the Web of Science database, and 852 domestic works which were published in 28 top domestic journals and collected from the CNKI database from 1949 to 2018, we draws keyword co-occurrence knowledge graph and keyword strategy map to visualize the landscape and evolution of leadership research and analyze the hot topics and research trends in the field of leadership.

Findings

The research found that: (1) Before 2002, there were only 7 articles published in 64 international top journal, mainly focusing on Western leadership theories such as transformational, cross-cultural comparison and the adaptability in Chinese context; (2) From 2003 to 2012, scholars had begun to introduce mainstream quantitative research paradigm in international academic community; (3) From 2013 to 2018, researches tended to be synchronized, with 461 and 99 papers published respectively. How emerging leaderships (such as ethical leadership) affect on various emerging outcome variables (such as creativity, voice behavior, unethical pro-organizational behavior etc.) is hot topic for future research.

Originality Value

Different from the previous qualitative reviews on organizational culture research, this paper, for the first time, uses bibliometric research methods to systematically analyze the evolution path of leadership research during the 70 years of China(1949–2018, and puts forward the future research prospects.

Details

Nankai Business Review International, vol. 13 no. 1
Type: Research Article
ISSN: 2040-8749

Keywords

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Article
Publication date: 21 September 2021

Wen Hong Xiao and M. Wang

The knowledge cloud links people and ideas while also providing worldwide resources for putting them into action. This paper aims to see how the knowledge cloud affects the…

255

Abstract

Purpose

The knowledge cloud links people and ideas while also providing worldwide resources for putting them into action. This paper aims to see how the knowledge cloud affects the stimulation of subordinate creativity. The impact of the knowledge cloud on transformational leadership and its impacts on subordinate creativity are examined in this investigation. Also, this study checks out the influence of knowledge cloud on motivational goal orientation and the impact of motivational goal orientation on subordinate creativity. It investigates the influence of knowledge cloud on self-efficacy and feelings of it on subordinate creativity. Moreover, this research examines the impact of the knowledge cloud on employee empowerment and its impact on subordinate creativity.

Design/methodology/approach

Knowledge sharing is known as a human rationale for information. It promotes learning, human performance, decision-making and problem-solving at the job; thus, innovation and creativity need novel knowledge. Knowledge cloud is a knowledge source that provides a base for knowledge co-creation. This investigation explores the structural relationships among knowledge cloud, transformational leadership, motivational goal orientation, self-efficacy, employee empowerment and subordinate creativity. Here, a model is improved and experimentally examined based on the knowledge cloud, transformational leadership, motivational goal orientation, self-efficacy and employee empowerment to improve subordinate creativity using partial least squares (PLS) and data from car factories' employees in Beijing.

Findings

The study results show that knowledge cloud, transformational leadership, motivational goal orientation, self-efficacy and employee empowerment are strongly related to subordinate creativity. In addition to using the Sobel test, all four variables' mediating role (transformational leadership, motivational goal orientation, self-efficacy and employee empowerment) is confirmed.

Practical implications

A knowledge cloud can improve the stimulating subordinate creativity of employees through transformational leadership, motivational goal orientation, self-efficacy and employee empowerment. First, the human resources department must have some programs to improve the knowledge cloud's incentive. Second, creating an atmosphere of cooperation and trust among employees should enhance the knowledge cloud's effects.

Originality/value

To the authors' knowledge, this is the first study that addresses the knowledge cloud's role in subordinate creativity in firms. This investigation also assists the creativity literature by testing the mediating effect of motivational goal orientation, transformational leadership, feelings of self-efficacy and employee empowerment.

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