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Article

Jun Zhong and Ruqi Ma

Jumping robots with coordinated multiple legs have been a hot research subject during the past years because of their excellent abilities in fast moving and…

Abstract

Purpose

Jumping robots with coordinated multiple legs have been a hot research subject during the past years because of their excellent abilities in fast moving and obstacle-climbing. However, dynamics of jumping process of these coordinated legged robots are complex because of collisions between coordinated legs and the ground. This paper aims to analyze features of jumping process and to present the kinematic and dynamic models of a novel sole-type quadruped jumping robot with variable coordinated joints.

Design/methodology/approach

A complete jumping period of is divided into several subphases according to contact status of different coordinated legs to the ground. Continuous dynamics and discrete dynamics are established in different subphases. Simulations are performed in MATLAB software and ADAMS environment.

Findings

Comparison between two-set simulated results acquired from ADAMS and MATLAB demonstrates the validity of kinematic and dynamic equations.

Originality/value

The established dynamics establish the foundation of further research in motion planning and controller design of coordinated multiple legs.

Details

Assembly Automation, vol. 40 no. 1
Type: Research Article
ISSN: 0144-5154

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Article

Xuebiao Wang, Xi Wang, Bo Li and Zhiqi Bai

The purpose of this paper is to consider that the model of volatility characteristics is more reasonable and the description of volatility is more explanatory.

Abstract

Purpose

The purpose of this paper is to consider that the model of volatility characteristics is more reasonable and the description of volatility is more explanatory.

Design/methodology/approach

This paper analyzes the basic characteristics of market yield volatility based on the five-minute trading data of the Chinese CSI300 stock index futures from 2012 to 2017 by Hurst index and GPH test, A-J and J-O Jumping test and Realized-EGARCH model, respectively. The results show that the yield fluctuation rate of CSI300 stock index futures market has obvious non-linear characteristics including long memory, jumpy and asymmetry.

Findings

This paper finds that the LHAR-RV-CJ model has a better prediction effect on the volatility of CSI300 stock index futures. The research shows that CSI300 stock index futures market is heterogeneous, means that long-term investors are focused on long-term market fluctuations rather than short-term fluctuations; the influence of the short-term jumping component on the market volatility is limited, and the long jump has a greater negative influence on market fluctuation; the negative impact of long-period yield is limited to short-term market fluctuation, while, with the period extending, the negative influence of long-period impact is gradually increased.

Research limitations/implications

This paper has research limitations in variable measurement and data selection.

Practical implications

This study is based on the high-frequency data or the application number of financial modeling analysis, especially in the study of asset price volatility. It makes full use of all kinds of information contained in high-frequency data, compared to low-frequency data such as day, weekly or monthly data. High-frequency data can be more accurate, better guide financial asset pricing and risk management, and result in effective configuration.

Originality/value

The existing research on the futures market volatility of high frequency data, mainly focus on single feature analysis, and the comprehensive comparative analysis on the volatility characteristics of study is less, at the same time in setting up the model for the forecast of volatility, based on the model research on the basic characteristics is less, so the construction of a model is relatively subjective, in this paper, considering the fluctuation characteristics of the model is more reasonable, characterization of volatility will also be more explanatory power. The difference between this paper and the existing literature lies in that this paper establishes a prediction model based on the basic characteristics of market return volatility, and conducts a description and prediction study on volatility.

Details

China Finance Review International, vol. 10 no. 2
Type: Research Article
ISSN: 2044-1398

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Article

Kristian Firing, Ragnheidur Karlsdottir and Jon Christian Laberg

The purpose of this paper is to develop a renewed understanding of social influence in the military by exploring officers' decision‐making processes in a stressful…

Abstract

Purpose

The purpose of this paper is to develop a renewed understanding of social influence in the military by exploring officers' decision‐making processes in a stressful situation. The intention is to develop self‐awareness as a central leadership capability in authentic leadership.

Design/methodology/approach

During wintertime in Norway, standing half‐naked and blindfolded on a wharf, officer cadets were offered the choice of jumping or not jumping into the icy ocean. From that starting point, a qualitative dialogue evolved in which the cadets reflected on their decision‐making processes and explored their reasons for making their decision. Finally, the decision was executed by the cadets on whether to jump into the icy water or not.

Findings

The results from “the water jump” showed that most of the cadets jumped, indicating that they preferred physical inconvenience over social inconvenience, and that officers are highly influenced by their group and the military organization.

Research limitations/implications

The research was conducted with a relatively small group and the findings may not generalize readily to other populations.

Practical implications

The “water jump” has been adopted by the Royal Norwegian Navy, and is under consideration by the Army and Police in Norway. Using the physical environment as a background to tap into the cadets' thinking in action provides knowledge about the individual self and social influence relevant to growth as leaders.

Originality/value

The paper is one of few to explore the role of social influence in the context of a military real‐world leadership training activity. Moreover, addressing social influence as a potential drawback in decision making is done to enhance self‐awareness as a central leadership capability of authentic leaders in operations.

Details

Leadership & Organization Development Journal, vol. 30 no. 8
Type: Research Article
ISSN: 0143-7739

Keywords

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Article

Jie Zhao, Gangfeng Liu, Jihong Yan and Xizhe Zang

The purpose of this paper is to present a new scout robot that tries to combine the hopping movement and the wheeling movement to greatly enlarge the scope of robot's activities.

Abstract

Purpose

The purpose of this paper is to present a new scout robot that tries to combine the hopping movement and the wheeling movement to greatly enlarge the scope of robot's activities.

Design/methodology/approach

A five‐shank hopping mechanism was employed to build the wheeling‐hopping combination scout robot. The non‐linear character of the five‐shank hopping mechanism was analyzed and then used in the proposed non‐linear spring‐mass model for the robot.

Findings

The rules of robot's movement were deduced, influencing factors of the jumping height were analyzed and the countermeasure was adopted. Simulations and an experiment of the robot's movement showed that the robot has strong locomotivity and survival ability.

Originality/value

A five‐shank hopping mechanism is proposed, analyzed and combined with wheeling movement to enhance the locomotivity and survival ability of scout robot.

Details

Industrial Robot: An International Journal, vol. 36 no. 3
Type: Research Article
ISSN: 0143-991X

Keywords

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Article

Shelagh Ferguson

This paper seeks to explore whether the global market segment Generation Y shares a common perception of a specific consumption activity, namely bungy jumping, and how…

Abstract

Purpose

This paper seeks to explore whether the global market segment Generation Y shares a common perception of a specific consumption activity, namely bungy jumping, and how perceptions of cool operate around that.

Design/methodology/approach

A qualitative methodology is adopted, appropriate to the exploratory aims of the research, which utilises existing filmed interviews to elicit responses from other members of Generation Y. The research explores shared identification, meaning and knowledge of a specific consumption practice, namely commercial bungy jumping.

Findings

The actual form of consumption, bungy jumping was widely accepted as being “cool” but a global consensus on a “cool” consumer and their story could not be reached. The research concludes by proposing a hierarchy for the attribution of cool from one Generation Y member to another; thus extending theoretical discussion and knowledge by investigating an established concept in a specific context to illustrate the complex and uneven nature of cultural globalisation.

Research limitations/implications

This research interprets global Generation Y culture from a small convenience sample from America, Ireland, Scotland and England, thus generating avenues for further research as discussed.

Originality/value

These findings have value for businesses that create consumption experiences for Generation Y customers and scholars seeking insight into the plural and complex function of cool.

Details

Young Consumers, vol. 12 no. 3
Type: Research Article
ISSN: 1747-3616

Keywords

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Article

Ching-Min Lee

For most practical control system problems, the state variables of a system are not often available or measureable due to technical or economical constraints. In these…

Abstract

Purpose

For most practical control system problems, the state variables of a system are not often available or measureable due to technical or economical constraints. In these cases, an observer-based controller design problem, which is involved with using the available information on inputs and outputs to reconstruct the unmeasured states, is desirable, and it has been wide investigated in many practical applications. However, the investigation on a discrete-time singular Markovian jumping system is few so far. This paper aims to consider an observer-based control problem for a discrete-time singular Markovian jumping system and provides a set of easy-used conditions to the proposed control law.

Design/methodology/approach

According to the connotation of the separation principle extended from linear systems, a mode-dependent observer and a state-feedback controller is designed and carried out independently via two sets of derived necessary and sufficient conditions in terms of linear matrix inequalities (LMIs).

Findings

A set of necessary and sufficient conditions for an admissibility analysis problem related to a discrete-time singular Markovian jumping system is derived to be a doctrinal foundation for the proposed design problems. A mode-dependent observer and a controller for such systems could be designed via two sets of strictly LMI-based synthesis conditions.

Research limitations/implications

The proposed method can be applied to discrete-time singular Markovian jumping systems with transition probability pij > 0 rather than the ones with pii = 0.

Practical implications

The formulated problem and proposed methods have extensive applications in various fields such as power systems, electrical circuits, robot systems, chemical systems, networked control systems and interconnected large-scale systems. Take robotic networked control systems for example. It is recognized that the variance phenomena derived from network transmission, such as packets dropout, loss and disorder, are suitable for modeling as a system with Markovian jumping modes, while the dynamics of the robot systems can be described by singular systems. In addition, the packets dropout or loss might result in unreliable transmission signals which motivates an observer-based control problem.

Originality/value

Both of the resultant conditions of analysis and synthesis problems for a discrete-time singular Markovian jumping system are necessary and sufficient, and are formed in strict LMIs, which can be used and implemented easily via MATLAB toolbox.

Details

Engineering Computations, vol. 34 no. 1
Type: Research Article
ISSN: 0264-4401

Keywords

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Article

Cheng-De Zheng and Zhanshan Wang

The purpose of this paper is to develop a methodology for the stochastically asymptotic synchronization problem for a class of neutral-type chaotic neural networks with…

Abstract

Purpose

The purpose of this paper is to develop a methodology for the stochastically asymptotic synchronization problem for a class of neutral-type chaotic neural networks with both leakage delay and Markovian jumping parameters under impulsive perturbations.

Design/methodology/approach

The authors perform drive-response concept and time-delay feedback control techniques to investigate a class of neutral-type chaotic neural networks with both leakage delay and Markovian jumping parameters under impulsive perturbations. New sufficient criterion is established without strict conditions imposed on the activation functions.

Findings

It turns out that the approach results in new sufficient criterion easy to be verified but without the usual assumption of the differentiability and monotonicity of the activation functions. Two examples show the effectiveness of the obtained results.

Originality/value

The novelty of the proposed approach lies in removing the usual assumption of the differentiability and monotonicity of the activation functions, and the use of the Lyapunov functional method, Jensen integral inequality, a novel Gu’s lemma, reciprocal convex and linear convex combination technique for the stochastically asymptotic synchronization problem for a class of neutral-type chaotic neural networks with both leakage delay and Markovian jumping parameters under impulsive perturbations.

Details

International Journal of Intelligent Computing and Cybernetics, vol. 9 no. 3
Type: Research Article
ISSN: 1756-378X

Keywords

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Article

Interview by Juliet Harrison

The purpose of this paper is to provide an interview with Paul Nunes and Tim Breene, authors of Jumping the S‐Curve

Abstract

Purpose

The purpose of this paper is to provide an interview with Paul Nunes and Tim Breene, authors of Jumping the S‐Curve

Design/methodology/approach

This briefing is prepared by an independent interviewer.

Findings

Every successful business eventually peaks. Greatness does not last. It falls prey to competition and commoditization, as well as obsolescence from the introduction of new technologies and innovations. And when a business's revenue growth stalls, only 7 percent ever go on to reclaim growth that is better than the growth of the market overall. The only solution is to jump to another growth curve, again and again.

Practical implications

Paul Nunes and Tim Breene take a look at the nature of the business “S‐curve”. Shaped like the first half of the bell curve, this curve is the characteristic depiction of how a new line of business ramps up, grows aggressively, and then ultimately flattens out. Through their interview, Paul and Tim give practical advice on what businesses should be doing in order to prepare for their next “S‐curve”.

Originality/value

The accelerating pace of business is forcing more top management teams to manage both their current successful business and their future business simultaneously. In the past, managers could often wait until the current business was firmly established, or even beginning to show signs of decline, before starting on the next. No longer. In this interview, Nunes and Breene highlight some of the most important disruptors emerging today, including cloud computing and sustainability, which are affecting companies in all industries, offering advice to companies wanting to take the lead in their own reinvention.

Details

Strategic Direction, vol. 27 no. 9
Type: Research Article
ISSN: 0258-0543

Keywords

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Book part

Carly Adams and Jason Laurendeau

Since the 1970s there have been extraordinary changes and growth in Canadian sport in terms of access, opportunity and recognition. Yet, the gains and successes of girls…

Abstract

Since the 1970s there have been extraordinary changes and growth in Canadian sport in terms of access, opportunity and recognition. Yet, the gains and successes of girls and women’s sport are often written, told and retold as uncomplicated success stories, as progress, with the battles fought and the complex negotiations of the past eerily absent. In this chapter, we turn to the work of feminist poststructuralist Avery Gordon to consider gender, feminisms and sport in the Canadian context. We do this by putting various moments in time in conversation with one another and considering our current moment in light of what has come before but is often forgotten, overlooked or even suppressed. We argue that the need for feminist praxis remains significant in Canadian sport and it is imperative that we continue to shed light on ghostly (dis)appearances in narratives of sport in Canada.

Details

Global Currents in Gender and Feminisms
Type: Book
ISBN: 978-1-78714-484-2

Keywords

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Article

Richard Cardinali and Zandralyn Gordon

Explains the problems disabled women have with the obstacles they must overcome to “cliff jump”. Focuses on the research literature, pointing out that much of this has…

Abstract

Explains the problems disabled women have with the obstacles they must overcome to “cliff jump”. Focuses on the research literature, pointing out that much of this has been oppressive. Argues that the research reinforces on those with disabilities that the differences they face are the results of their individual limitations or inadequacies rather than the limitations of society. Covers areas such as attitude, education, health care, abuse, information and empowerment.

Details

Equal Opportunities International, vol. 20 no. 8
Type: Research Article
ISSN: 0261-0159

Keywords

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