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Article
Publication date: 2 January 2018

Yong Guo, Shen-Min Song and Xue-Hui Li

This paper aims to investigate the problem of finite-time consensus tracking control without unwinding for formation flying spacecraft in the presence of external disturbances.

Abstract

Purpose

This paper aims to investigate the problem of finite-time consensus tracking control without unwinding for formation flying spacecraft in the presence of external disturbances.

Design/methodology/approach

Two distributed finite-time controllers are developed using the backstepping sliding mode. The first robust controller can compensate for external disturbances with known bounds, and the second one can compensate for external disturbances with unknown bounds.

Findings

Because the controllers are designed on the basis of rotation matrix, which represents the set of attitudes both globally and uniquely, the system can overcome the drawback of unwinding, which results in extra fuel consumption. Through introducing a novel virtual angular velocity, exchange of control signals between neighboring spacecraft becomes unnecessary, and it is able to reduce the communication burden.

Practical implications

The two robust controllers can deal with unwinding that may result in fuel consumption by traveling a long distance before returning to a desired attitude when the closed-loop system is close to the desired attitude equilibrium.

Originality/value

Two finite-time controllers without unwinding are proposed for formation flying spacecraft by using backstepping sliding mode. Furthermore, exchange of control signals between neighboring spacecraft is unnecessary.

Details

Aircraft Engineering and Aerospace Technology, vol. 90 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 25 November 2019

Song Quan, Guo Yong, Gong Jun, Xuedong Liu, Jin Yongping and Yang Shuyi

This paper aims to study the frictional performance of reciprocating pair with high velocity by using hydrodynamic lubrication principle and fish scale textured piston model.

Abstract

Purpose

This paper aims to study the frictional performance of reciprocating pair with high velocity by using hydrodynamic lubrication principle and fish scale textured piston model.

Design/methodology/approach

Based on the idea of function characteristic approximation and coordinate change, a mathematical representation model of imitating fish scale texture pit section is established. According to the principle of dynamic pressure lubrication of the textured fluid, a three-dimensional numerical model of flow field for fish scale texture is established without considering cavitation. Numerical analysis of the model carp scale texture unit by orthogonal experimental design and FLUENT software is carried out.

Findings

Effects of fish scale pit texture on friction properties for a reciprocating pair piston surface with high velocity (impact piston) are acquired. Effects of texture characterization parameters and flow rate on the surface friction performance for impact piston are found. Effects of different characteristic parameters combination of imitating fish scale texture on friction performance for impact piston surface are obtained.

Originality/value

The model is an effective tool to study the friction and wear of reciprocating pair with high velocity. The effects of fish scale textured piston pair supply a theory lead to design the reciprocating pair with better friction performance.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-09-2019-0398

Details

Industrial Lubrication and Tribology, vol. 72 no. 4
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 19 July 2021

Song Quan, Yong Guo, Xuedong Liu, Zhewu Chen and Yudi Liu

This paper aims to study the lubrication and sealing performance on the textured piston pair under the cross action of the shape and structure parameters. This paper further…

Abstract

Purpose

This paper aims to study the lubrication and sealing performance on the textured piston pair under the cross action of the shape and structure parameters. This paper further carries out the optimization design of low energy consumption hydraulic impact piston pair.

Design/methodology/approach

Based on the characteristics of the ring gap seal piston pair, the flow field analysis model of the whole film gap is established for its periodic treatment. The friction power loss of the piston pair is defined as the evaluation index of the lubrication performance and the leakage power loss as the evaluation index of the sealing performance. The orthogonal test design and CFD software were used to analyze the lubrication and sealing performance of the textured piston pair.

Findings

The cross action of shape and structure factors has a great influence of the lubrication and sealing performance on the textured piston pair. Clearance and shape parameters have great influence on it, while seal length and depth diameter ratio have little influence. The sealing performance of conical textured piston pair is good, while the lubrication performance of square textured piston pair is good. The primary and secondary order of influence of shape and structure on energy consumption on piston pair is B (seal clearance) > C (texture shape) > D (area ratio) > A (seal length) > E (depth diameter ratio).

Originality/value

Breaking the defect of local optimization design on traditional piston pair structure, then find the matching relationship of structural parameters on textured piston pair. Further improve the lubrication and sealing performance of the piston pair, and provide reference for the global optimization design of the low energy consumption hydraulic impact piston pair.

Details

Industrial Lubrication and Tribology, vol. 74 no. 4
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 5 January 2015

Yong Guo and Songfeng Li

The purpose of this paper is to analyze several measures which the government of the People’s Republic of China (PRC) has adopted to curb corruption and to make recommendations to…

1852

Abstract

Purpose

The purpose of this paper is to analyze several measures which the government of the People’s Republic of China (PRC) has adopted to curb corruption and to make recommendations to curb the spread of corruption.

Design/methodology/approach

The study is based on the analysis of government policy documents and reports, and statistical data on anti-corruption measures in China.

Findings

During the past ten years, the government of the PRC has adopted these anti-corruption measures: first, increasing the ability to handle cases for deterring corrupt officials; second, improving the work style of officials and prohibiting them from enjoying special privileges, and promoting moral behavior among them; third, reforming the economic and political system to reduce corruption opportunities; and fourth, reforming the Central Commission for Discipline Inspection (CCDI) to more effectively handle corruption cases. Nevertheless, in despite of these anti-corruption measures, there remain serious challenges for reducing corruption stemming from an irrational system of administrative reform and balancing the relationship between the CCDI and the judiciary departments to enhance the professionalism and efficiency of the anti-corruption agencies, which continue to constrain China’s current anti-corruption efforts. Therefore, the Chinese government should take a top-down approach, analyze the characteristics and trends of corruption in the new era, strengthen the institutional structures, and strive to suppress the spread of corruption.

Originality/value

This paper will be useful for those scholars, policy-makers and anti-corruption practitioners who are interested in China’s anti-corruption measures.

Details

Asian Education and Development Studies, vol. 4 no. 1
Type: Research Article
ISSN: 2046-3162

Keywords

Article
Publication date: 5 March 2013

Du Yong and Li Guo-qiang

Calculation methods have been developed for application to advanced fire-resistance design. The loading-bearing capacity method involves the performance of a structural analysis…

Abstract

Calculation methods have been developed for application to advanced fire-resistance design. The loading-bearing capacity method involves the performance of a structural analysis for a fire situation using the computer-based finite element method, and checks the loading-bearing capacity of the structure in a fire ultimate limit state. There is a case of a steel roof grid structure fire-resistant assessment to illustrate the basic steps in the loading-bearing capacity method for structural fire safety design. A detailed finite element analysis of a space truss with a credible design fire was carried out to determine the deflections and forces in the space truss, and checked by the fire ultimate limit state. The present data and analysis demonstrate that the loading-bearing capacity method is sufficient for fire safety design.

Details

Journal of Structural Fire Engineering, vol. 4 no. 1
Type: Research Article
ISSN: 2040-2317

Content available
Article
Publication date: 5 January 2015

Jon S. T. Quah and Chilik Yu

201

Abstract

Details

Asian Education and Development Studies, vol. 4 no. 1
Type: Research Article
ISSN: 2046-3162

Article
Publication date: 1 April 2014

Yan-Hong Yao, Ying-Ying Fan, Yong-Xing Guo and Yuan Li

This paper aims to explore the influences of leadership and work stress on employee behavior, and the moderating effects of transactional and transformational leadership on the…

10384

Abstract

Purpose

This paper aims to explore the influences of leadership and work stress on employee behavior, and the moderating effects of transactional and transformational leadership on the relationship between work stress and employee negative behavior.

Design/methodology/approach

Using convenience sampling method, the authors investigated employees from 20 firms in different places and industries, and 347 valid questionnaires were collected. SPSS18.0 statistical analysis software was used for reliability and validity analysis, descriptive statistics, correlation analysis and hierarchical regression analysis to test the hypothesis.

Findings

The empirical results show that there is a positive correlation between work stress and employee negative behavior. Transformational leadership has negative impacts on work stress and employee negative behavior, whereas transactional leadership has positive influences. Moreover, transactional leadership strengthens the influence of work stress on employee negative behavior, whereas transformational leadership has no moderating effect.

Practical implications

First, enterprises should take employees’ stress tolerance into account in selection and recruitment, and enhance stress management. Second, by demonstrating inspirational vision and personal charisma, open leadership style, rather than short-term transactional behavior, will motivate subordinates more effectively. Finally, distribution system should be improved to achieve principle and procedural justice.

Originality/value

The paper extends the research on employee behavior by investigating the impacts of leadership and work stress. According to Chinese social, economic and cultural characteristics, this research examines the influence of contemporary Chinese mindset and pluralistic values on employee behavior. Open leadership is proposed as a new leadership style, which contributes to improving leadership behavior and preventing negative behavior in workplace.

Details

Chinese Management Studies, vol. 8 no. 1
Type: Research Article
ISSN: 1750-614X

Keywords

Article
Publication date: 5 January 2015

Jon S. T. Quah

The purpose of this paper is threefold: first, to ascertain the levels of effectiveness of the anti-corruption agencies (ACAs) in China, Japan, Philippines, Singapore and Taiwan;…

1592

Abstract

Purpose

The purpose of this paper is threefold: first, to ascertain the levels of effectiveness of the anti-corruption agencies (ACAs) in China, Japan, Philippines, Singapore and Taiwan; second, to explain why some of these ACAs are more effective than others; and third, to suggest some policy recommendations for addressing their limitations.

Design/methodology/approach

This paper relies on three well-known international indicators to assess the perceived extent of corruption in the five countries. Similarly, their quality of governance is assessed by their total percentile rank on the World Bank’s six governance indicators in 2013.

Findings

Singapore’s Corrupt Practices Investigation Bureau is effective because of its government’s political will and favorable policy context. The Philippines and Taiwan rely on ineffective multiple ACAs, which are inadequately staffed and funded, and compete with each other for limited resources. China’s Central Commission for Discipline Inspection is ineffective because corrupt party members are disciplined and not prosecuted, and the political leaders use corruption as a weapon against their opponents. Japan’s weak political will is reflected in its reluctance to address its structural corruption. This paper concludes with policy recommendations for enhancing the effectiveness of the ACAs in the five countries.

Originality/value

The comparative analysis of the effectiveness of the ACAs in the five Asian countries and the policy recommendations for addressing their limitations will be of interest to policy makers, scholars and anti-corruption practitioners.

Details

Asian Education and Development Studies, vol. 4 no. 1
Type: Research Article
ISSN: 2046-3162

Keywords

Article
Publication date: 21 November 2016

Ibrahim Bakry, Osama Moselhi and Tarek Zayed

Construction projects are complex projects taking place in dynamic environments, which necessitates accounting for different uncertainties during the planning stage. There is a…

1181

Abstract

Purpose

Construction projects are complex projects taking place in dynamic environments, which necessitates accounting for different uncertainties during the planning stage. There is a significant lack of management tools for repetitive projects accounting for uncertainties in the construction environment. The purpose of this paper is to present an algorithm for the optimized scheduling of repetitive construction projects under uncertainty.

Design/methodology/approach

Fuzzy set theory is utilized to model uncertainties associated with various input parameters. The developed algorithm has two main components: optimization component and buffering component. The optimization component presents a dynamic programming approach that processes fuzzy numbers. The buffering component converts the optimized fuzzy schedule into a deterministic schedule and inserts time buffers to protect the schedule against anticipated delays. Agreement Index (AI) is used to capture the user’s desired level of confidence in the produced schedule while sizing buffers. The algorithm is capable of optimizing for cost or time objectives. An example project drawn from literature is analysed to demonstrate the capabilities of the developed algorithm and to allow comparison of results to those previously generated.

Findings

Testing the algorithm revealed several findings. Fuzzy numbers can be utilized to capture uncertainty in various inputs without the need for historical data. The modified algorithm is capable of optimizing schedules, for different objectives, under uncertainty. Finally AI can be used to capture users’ desired confidence in the final schedule.

Originality/value

Project planners can utilize this algorithm to optimize repetitive projects schedules, while modelling uncertainty in different input parameters, without the need for relevant historical data.

Details

Engineering, Construction and Architectural Management, vol. 23 no. 6
Type: Research Article
ISSN: 0969-9988

Keywords

Article
Publication date: 13 November 2020

Jan Philipp Graesch, Susanne Hensel-Börner and Jörg Henseler

The enabling technologies that emerged from information technology (IT) have had a considerable influence upon the development of marketing tools, and marketing has become…

3915

Abstract

Purpose

The enabling technologies that emerged from information technology (IT) have had a considerable influence upon the development of marketing tools, and marketing has become digitalized by adopting these technologies over time. The purpose of this paper is to demonstrate the impacts of these enabling technologies on marketing tools in the past and present and to demonstrate their potential future. Furthermore, it provides guidance about the digital transformation occurring in marketing and the need to align of marketing and IT.

Design/methodology/approach

This study demonstrates the impact of enabling technologies on the subsequent marketing tools developed through a content analysis of information systems and marketing conference proceedings. It offers a fresh look at marketing's digital transformation over the last 40 years. Moreover, it initially applies the findings to a general digital transformation model from another field to verify its presence in marketing.

Findings

This paper identifies four eras within the digital marketing evolution and reveals insights into a potential fifth era. This chronological structure verifies the impact of IT on marketing tools and accordingly the digital transformation within marketing. IT has made digital marketing tools possible in all four digital transformation levers: automation, customer interaction, connectivity and data.

Practical implications

The sequencing of enabling technologies and subsequent marketing tools demonstrates the need to align marketing and IT to design new marketing tools that can be applied to customer interactions and be used to foster marketing control.

Originality/value

This study is the first to apply the digital transformation levers, namely, automation, customer interaction, connectivity and data, to the marketing discipline and contribute new insights by demonstrating the chronological development of digital transformation in marketing.

1 – 10 of 553