Search results

1 – 10 of 69
To view the access options for this content please click here
Article
Publication date: 13 May 2020

Jianfeng Li, Wenpei Fan, Mingjie Dong and Xi Rong

The purpose of this paper is to implement a passive compliance training strategy for our newly designed 2-UPS/RRR parallel ankle rehabilitation robot (PARR) to enhance its…

Abstract

Purpose

The purpose of this paper is to implement a passive compliance training strategy for our newly designed 2-UPS/RRR parallel ankle rehabilitation robot (PARR) to enhance its rehabilitation training safety.

Design/methodology/approach

First, a kinematic analysis of the PARR is introduced, and the mechanism ensures that the rotation centre of the ankle joint complex (AJC) coincides with robot’s rotation centre. Then, a passive compliance training strategy based on admittance control is described in detail and is implemented on our PARR.

Findings

Experiments involving healthy subjects were conducted, and the performance of trajectory tracking was quantitatively evaluated, with the results showing excellent compliance and trajectory tracking accuracy, which can ensure that a secondary injury to the AJC during passive rehabilitation training is avoided. The influence of different admittance parameters was also simulated and analysed, which can contribute to the development of adaptive parameter adjustment research.

Originality/value

The paper can be used to improve the effectiveness of ankle rehabilitation, to alleviate manual therapy problems in terms of labour intensiveness, precision and subjectivity and to ensure safety and comfort during rehabilitation sessions.

Details

Industrial Robot: the international journal of robotics research and application, vol. 47 no. 5
Type: Research Article
ISSN: 0143-991X

Keywords

To view the access options for this content please click here
Article
Publication date: 26 September 2019

Leiyu Zhang, Jianfeng Li, Shuting Ji, Peng Su, Chunjing Tao and Run Ji

Upper-limb joint kinematics are highly complex and the kinematics of rehabilitation exoskeletons fail to reproduce them, resulting in hyperstaticity and human–machine…

Abstract

Purpose

Upper-limb joint kinematics are highly complex and the kinematics of rehabilitation exoskeletons fail to reproduce them, resulting in hyperstaticity and human–machine incompatibility. The purpose of this paper is to design and develop a compatible exoskeleton robot (Co-Exos II) to address these problems.

Design/methodology/approach

The configuration synthesis of Co-Exos II is completed using advanced mechanism theory. A compatible configuration is selected and four passive joints are introduced into the connecting interfaces based on optimal configuration principles. A Co-Exos II prototype with nine degrees of freedom (DOFs) is developed and still owns a compact structure and volume. A new approach is presented to compensate the vertical glenohumeral (GH) movements. Co-Exos II and the upper arm are simplified as a guide-bar mechanism at the elevating plane. The theoretical displacements of passive joints are calculated by the kinematic model of the shoulder loop. The compatible experiments are completed to measure the kinematics of passive joints.

Findings

The compatible configuration of the passive joints can effectively reduce the gravity influences of the exoskeleton device and the upper extremities. The passive joints exhibit excellent compensation effect for the GH joint movements by comparing the theoretical and measured results. Passive joints can compensate for most GH movements, especially vertical movements.

Originality/value

Co-Exos II possesses good human–machine compatibility and wearable comfort for the affected upper limbs. The proposed compensation method is convenient to therapists and stroke patients during the rehabilitation trainings.

To view the access options for this content please click here
Article
Publication date: 26 November 2019

Mingjie Dong, Jianfeng Li and Wusheng Chou

The purpose of this study is to develop a new positioning method for remotely operated vehicle (ROV) in the nuclear power plant. The ROV of the nuclear power plant is…

Abstract

Purpose

The purpose of this study is to develop a new positioning method for remotely operated vehicle (ROV) in the nuclear power plant. The ROV of the nuclear power plant is developed to inspect the reactor cavity pools, the component pools and spent-fuel storage pools. To enhance the operational safety, the ability of localizing the ROV is indispensable.

Design/methodology/approach

Therefore, the positioning method is proposed based on the MEMS inertial measurement unit and mechanical scanning sonar in this paper. Firstly, the ROV model and on board sensors are introduced in detail. Then the sensor-based Kalman filter is deduced for attitude estimation. After that, the positioning method is proposed that divided into static positioning and dynamic positioning. The improved iterative closest point-Kalman filter is deduced to estimate the global position by the whole circle scanning sonar data in static, and the relative positioning method is proposed by the small scale scanning sonar data in dynamic.

Findings

The performance of the proposed method is verified by comparing with the visual positioning system. Finally, the effectiveness of the proposed method is proved by the experiment in the reactor simulation pool of the Daya Bay Nuclear Power Plant.

Originality/value

The research content of this manuscript is aimed at the specific application needs of nuclear power plants and has high theoretical significance and application value.

Details

Industrial Robot: the international journal of robotics research and application, vol. 47 no. 2
Type: Research Article
ISSN: 0143-991X

Keywords

To view the access options for this content please click here
Article
Publication date: 24 August 2012

Xinming Deng, Zhilong Tian, Jianfeng Li and Muhammad Abrar

The purpose of this paper is to comprehensively investigate the combined influence of a firm's political connection and diversification on corporate performance, and to…

Abstract

Purpose

The purpose of this paper is to comprehensively investigate the combined influence of a firm's political connection and diversification on corporate performance, and to explore whether firm's political connection has an impact on the diversification effect, and whether this diversification effect would promote its performance significantly or not.

Design/methodology/approach

The research used a regression model to explore the correlation among political connection, diversification strategy, and corporate performance. The research subjects are the private enterprises listed on Shanghai and Shenzhen Stock Exchange in China for the period 2002‐2005.

Findings

The study found that: first, for those firms without political connections, the relationship between diversification strategy and corporate performance displayed an “inverted U” curve; for firms with political connection, the relationship was a “reverse L”. Second, firms with political connections are more likely to implement a diversification strategy, especially unrelated diversification. Third, when implementing an internationalization strategy, private enterprises with political connections are more likely to expand through unrelated diversification strategy. Fourth, the diversification of the enterprises with political connection are more likely to promote the short‐term accounting performance than those without political connection, but the unrelated diversification of politically connected enterprises would have a negative impact upon its future performance, that is to damage the company's market value.

Originality/value

The paper expands the literature on the relationship between diversification and firm performance. It contributes to the research about the influence of political connection upon corporate performance.

To view the access options for this content please click here
Article
Publication date: 1 December 2002

Thomas M. Begley, Cynthia Lee, Yongqing Fang and Jianfeng Li

Power distance was tested as a moderator of the relationship between justice concerns and employee outcomes in a sample of employees in the People’s Republic of China. Two…

Abstract

Power distance was tested as a moderator of the relationship between justice concerns and employee outcomes in a sample of employees in the People’s Republic of China. Two hypotheses were developed based on the quality of authority‐member relations prescribed by the relational model of authority in groups. In two‐way interactions, higher power distance combined with procedural justice to predict employee outcomes, whereas lower power distance combined with distributive justice.

Details

Journal of Managerial Psychology, vol. 17 no. 8
Type: Research Article
ISSN: 0268-3946

Keywords

To view the access options for this content please click here
Article
Publication date: 3 October 2008

Jundong Hou, Lanying Du and Jianfeng Li

One purpose of this paper is to examine several factors that potentially influence a consumer's purchasing decision to participate in cause‐related marketing (CRM) program…

Abstract

Purpose

One purpose of this paper is to examine several factors that potentially influence a consumer's purchasing decision to participate in cause‐related marketing (CRM) program in the Chinese context. The other is to empirically test the hypothesized relationship between cause's attributes and purchase intention in such environment.

Design/methodology/approach

This paper develops a measure for exploring the cause's attributes influencing consumer's purchasing intention. Two groups of valid samples, respectively, with 178 and 376 respondents are collected through questionnaire survey. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) are employed to extract and test the key influential attributes on the basis of data of two samples respectively, and structural equation model is used to define the structure of influencing attributes and to measure the degree of impact for each attribute on the consumer's purchasing intention.

Findings

The results show that the degree of cause's participation for consumer, fit between the brand and the cause, cause importance, congruence between the firm's product and the cause, cause proximity play an important role in consumers’ attitudes toward the product and firm and their intentions to purchase the advertised product and participate in the CRM campaign, which suggests an opportunity for nonprofits to compete for these vital resources by nurturing and leveraging the antecedent factors and an opportunity for firms to select a cause partner.

Research limitations/implications

The sample is a convenience sample that is the main limitations of this research. The EFA and CFA is difficult to generalize to a larger audience, and there was a lack of experimental control for the questionnaire investigation, so the quality of questionnaire can not be ensured.

Practical implications

This research should help firms determine the best partners for strategic social alliances, and provide an advice on how to make them maximum participation, also should help current and potential consumers ascribe personality traits to nonprofit organizations and differentiate between nonprofits on the basis of the cause's attributes. At the same time, this paper provides several interesting areas for future research that will further aid marketing managers to develop a more effective CRM campaign to fit with goals of corporate, which adds some valuable insights or new ideas to develop essential theory.

Originality/value

This paper offers interesting insight into the development of CRM campaigns, and explores the five variables: the degree of cause's participation for consumer; fit between the brand and the cause; cause importance; congruence between the firm's product and the cause; cause proximity also should influence consumer's purchasing attitude, intention and decision behavior in the Chinese context.

Details

Asia Pacific Journal of Marketing and Logistics, vol. 20 no. 4
Type: Research Article
ISSN: 1355-5855

Keywords

To view the access options for this content please click here
Article
Publication date: 1 March 2001

Amita Gupta and Brian H. Kleiner

Provides a brief outline of the Philippines before looking at the values held by the culture and the management style commonly adopted. Outlines personnel management…

Abstract

Provides a brief outline of the Philippines before looking at the values held by the culture and the management style commonly adopted. Outlines personnel management practices with references to short case studies. Concludes that one must first understand the culture in relation to feelings, honour and relationships and the successful company is one which has formed effective relationships with not only customers but employees, suppliers and dealers and also provides staff with development opportunities.

Details

Management Research News, vol. 24 no. 3/4
Type: Research Article
ISSN: 0140-9174

Keywords

Content available
Article
Publication date: 24 August 2012

Michele E.M. Akoorie

Abstract

Details

Chinese Management Studies, vol. 6 no. 3
Type: Research Article
ISSN: 1750-614X

To view the access options for this content please click here
Article
Publication date: 30 July 2020

Xu Li, Jun Li, Xiaoyi Zhang, Jianfeng Gao and Chao Zhang

Viscous dampers are commonly used in large span cable-stayed bridges to mitigate seismic effects and have achieved great success.

Abstract

Purpose

Viscous dampers are commonly used in large span cable-stayed bridges to mitigate seismic effects and have achieved great success.

Design/methodology/approach

However, the nonlinear analysis on damper parameters is usually computational intensive and nonobjective. To address these issues, this paper proposes a simplified method to determine the viscous damper parameters for double-tower cable-stayed bridges. An empirical formula of the equivalent damping ratio of viscous dampers is established through decoupling nonclassical damping structures and linearization of nonlinear viscous dampers. Shaking table tests are conducted to verify the feasibility of the proposed method. Moreover, this simplified method has been proved in long-span cable-stayed bridges.

Findings

The feasibility of this method is verified by the simplified model shaking table test. This simplified method for determining the parameters of viscous dampers is verified in cable-stayed bridges with different spans.

Originality/value

This simplified method has been validated in cable-stayed bridges with various spans.

Details

Engineering, Construction and Architectural Management, vol. 27 no. 8
Type: Research Article
ISSN: 0969-9988

Keywords

To view the access options for this content please click here
Article
Publication date: 8 January 2018

Jianmei Wang, Zhixiong Li, Sadoughi Mohammadkazem, Min Cai, Jianfeng Kang and Yanan Zhang

The stability characteristics of an oil film directly influence the safety and service life of mill oil-film bearings. However, very limited work has been done to address…

Abstract

Purpose

The stability characteristics of an oil film directly influence the safety and service life of mill oil-film bearings. However, very limited work has been done to address the stability characteristics of mill oil-film bearings. To this end, this paper aims to investigate the stability characteristics of mill oil-film bearings through theoretical and experimental analysis.

Design/methodology/approach

For the first time, a special designed experiment platform was developed to investigate the stability characteristics of mill oil-film bearings. In addition, a theoretical model of lubricating film of the tested bearings was established to analyze the oil-film stability. The theoretical results were compared with the experimental results.

Findings

The comparison results demonstrate that the critical influential factors on the bearing stability were the eccentricity ratio and the ratio of bearing length to diameter. The mill bearing was likely to be unstable under a small load and at a high rotational speed.

Practical implications

The paper includes implications for suitable operation conditions in practical use of mill oil-film bearings.

Originality/value

This paper fulfills an identified need to investigate oil-film stability of mill bearings for practical applications.

Details

Industrial Lubrication and Tribology, vol. 70 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

1 – 10 of 69