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Article
Publication date: 28 October 2021

Ce Rong, Zhongbo He, Guangming Xue, Guoping Liu, Bowen Dai and Zhaoqi Zhou

Owing to the excellent performance, giant magnetostrictive materials (GMMs) are widely used in many engineering fields. The dynamic Jiles–Atherton (J-A) model, derived from…

Abstract

Purpose

Owing to the excellent performance, giant magnetostrictive materials (GMMs) are widely used in many engineering fields. The dynamic Jiles–Atherton (J-A) model, derived from physical mechanism, is often used to describe the hysteresis characteristics of GMM. However, this model, despite cited by many different literature studies, seems not to possess unique expressions, which may cause great trouble to the subsequent application. This paper aims to provide the rational expressions of the dynamic J-A model and propose a numerical computation scheme to obtain the model results with high accuracy and fast speed.

Design/methodology/approach

This paper analyzes different published papers and provides a reasonable form of the dynamic J-A model based on functional properties and physical explanations. Then, a numerical computation scheme, combining the Newton method and the explicit Adams method, is designed to solve the modified model. In addition, the error source and transmission path of the numerical solution are investigated, and the influence of model parameters on the calculation error is explored. Finally, some attempts are made to study the influence of numerical scheme parameters on the accuracy and time of the computation process. Subsequently, an optimization procedure is proposed.

Findings

A rational form of the dynamic J-A model is concluded in this paper. Using the proposed numerical calculation scheme, the maximum calculation error, while computing the modified model, can remain below 2 A/m under different model parameter combinations, and the computation time is always less than 0.5 s. After optimization, the calculation speed can be enhanced with the computation accuracy guaranteed.

Originality/value

To the best of the authors’ knowledge, this paper is the first one trying to provide a rational form of the dynamic J-A model among different citations. No other research studies focus on designing a detailed computation scheme targeting the fast and accurate calculation of this model as well. And the performance of the proposed calculation method is validated in different conditions.

Details

Engineering Computations, vol. 39 no. 4
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 4 December 2023

Feifei Zhong, Guoping Liu, Zhenyu Lu, Lingyan Hu, Yangyang Han, Yusong Xiao and Xinrui Zhang

Robotic arms’ interactions with the external environment are growing more intricate, demanding higher control precision. This study aims to enhance control precision by…

Abstract

Purpose

Robotic arms’ interactions with the external environment are growing more intricate, demanding higher control precision. This study aims to enhance control precision by establishing a dynamic model through the identification of the dynamic parameters of a self-designed robotic arm.

Design/methodology/approach

This study proposes an improved particle swarm optimization (IPSO) method for parameter identification, which comprehensively improves particle initialization diversity, dynamic adjustment of inertia weight, dynamic adjustment of local and global learning factors and global search capabilities. To reduce the number of particles and improve identification accuracy, a step-by-step dynamic parameter identification method was also proposed. Simultaneously, to fully unleash the dynamic characteristics of a robotic arm, and satisfy boundary conditions, a combination of high-order differentiable natural exponential functions and traditional Fourier series is used to develop an excitation trajectory. Finally, an arbitrary verification trajectory was planned using the IPSO to verify the accuracy of the dynamical parameter identification.

Findings

Experiments conducted on a self-designed robotic arm validate the proposed parameter identification method. By comparing it with IPSO1, IPSO2, IPSOd and least-square algorithms using the criteria of torque error and root mean square for each joint, the superiority of the IPSO algorithm in parameter identification becomes evident. In this case, the dynamic parameter results of each link are significantly improved.

Originality/value

A new parameter identification model was proposed and validated. Based on the experimental results, the stability of the identification results was improved, providing more accurate parameter identification for further applications.

Details

Industrial Robot: the international journal of robotics research and application, vol. 51 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 7 May 2024

Guoping Liu and Jerry Sun

The purpose of this study is to examine whether the institutional environment influences auditor reporting.

Abstract

Purpose

The purpose of this study is to examine whether the institutional environment influences auditor reporting.

Design/methodology/approach

This study employs China's anti-corruption campaign as an exogenous shock to its institutional environment and compares auditors' issuance of modified audit opinions (MAOs) to small-profit clients before and during the campaign.

Findings

This study documents that small-profit clients were more likely to receive MAOs during the anti-corruption campaign period than before, indicating that auditors issued more conservative audit opinions to small-profit clients because of the anti-corruption campaign. Additionally, this study finds that increased auditor conservatism was more pronounced for auditors of large clients.

Practical implications

This study suggests that a weak institutional environment adversely affects auditor conservatism. This offers valuable insights for governments and regulators to improve the audit environment and for audit firms to enhance auditors' integrity and independence.

Originality/value

This study contributes to the research on institutional environments and auditing by observing a unique exogenous event.

Details

Journal of Accounting in Emerging Economies, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2042-1168

Keywords

Article
Publication date: 5 February 2021

Guoping Liu and Jerry Sun

The purpose of this study is to examine whether independent directors' financial expertise affects the use of private information in setting bank chief executive officer (CEO…

Abstract

Purpose

The purpose of this study is to examine whether independent directors' financial expertise affects the use of private information in setting bank chief executive officer (CEO) bonuses.

Design/methodology/approach

The association between future firm performance and bank CEO bonuses is used to measure the incorporation of private information into bonuses. Both level and change specifications are employed to test the effect of independent directors' financial expertise on the use of private information in setting CEO bonuses.

Findings

It is found that future firm performance is more positively associated with bank CEO bonuses for banks with a higher proportion of financial experts among independent directors than for other banks. The findings suggest that independent directors with financial expertise can more effectively use private information in setting bank CEO bonuses.

Originality/value

Research on independent directors' role in the use of private information in setting compensation is valuable for understanding how corporate governance can enhance the efficiency of CEO compensation contracts. This study indicates that financial experts on the bank board play an important role in this regard.

Details

International Journal of Managerial Finance, vol. 18 no. 2
Type: Research Article
ISSN: 1743-9132

Keywords

Article
Publication date: 2 September 2021

Guoping Liu and Jerry Sun

The purpose of this study is to examine whether firm-specific litigation risk affects independent director conservatism in the oversight of financial reporting.

Abstract

Purpose

The purpose of this study is to examine whether firm-specific litigation risk affects independent director conservatism in the oversight of financial reporting.

Design/methodology/approach

This study considers the enactment of Sarbanes–Oxley Act and the main US stock exchanges' corresponding corporate governance regulations in 2002–2003 as an exogenous shock event to increase board independence. OLS regressions with fixed effects are conducted to test the hypothesis.

Findings

Changes in discretionary accruals from the pre-event year (2001) to the post-event year (2004) are more negatively associated with an exogenous increase in board independence for firms with high litigation risk than for firms with low litigation risk.

Originality/value

The results suggest that independent directors are more conservative in overseeing financial reporting when they face higher litigation risk, consistent with the notion that they are still concerned about liability risk although they seldom have to pay damages or legal fees out of their own pockets.

Details

Managerial Finance, vol. 48 no. 1
Type: Research Article
ISSN: 0307-4358

Keywords

Article
Publication date: 17 February 2022

Guoping Liu and Jerry Sun

The purpose of this study is to examine whether the COVID-19 pandemic has affected earnings management and the value relevance of earnings in the USA.

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Abstract

Purpose

The purpose of this study is to examine whether the COVID-19 pandemic has affected earnings management and the value relevance of earnings in the USA.

Design/methodology/approach

Discretionary accruals, the explanatory power and slope coefficient of earnings are compared between 2019 (prepandemic year) and 2020 (pandemic year). Univariate and regression analyses are performed.

Findings

There was a significant decline in discretionary accruals from 2019 to 2020, suggesting that firms engaged in more income-decreasing earnings management to take a big bath in reporting earnings in the pandemic year. Meanwhile, the explanatory power and slope coefficient of earnings both were lower in 2020 than in 2019, consistent with the notion that the pandemic has impaired the value relevance of earnings.

Originality/value

This study explores the consequences of the pandemic from accounting perspective. It also enriches accounting research on economic crises.

Details

Managerial Auditing Journal, vol. 37 no. 7
Type: Research Article
ISSN: 0268-6902

Keywords

Article
Publication date: 23 September 2019

Guoping Liu and Jerry Sun

The purpose of this study is to examines whether clients’ share prices responded to three events, including the Securities and Exchange Commission (SEC) launch of administrative…

Abstract

Purpose

The purpose of this study is to examines whether clients’ share prices responded to three events, including the Securities and Exchange Commission (SEC) launch of administrative proceedings against five Chinese accounting firms on December 3, 2012, for their failure to hand over audit work papers due to conflict of jurisdiction; the issuance of SEC Administrative Law Judge Elliot’s ruling on January 22, 2014; and the settlement of the administrative proceedings on February 6, 2015.

Design/methodology/approach

This study uses the Schipper and Thompson approach.

Findings

It is found that share prices responded negatively around December 3, 2012, for USA-listed Chinese companies who were audited by Chinese auditors.

Originality/value

This study provides evidence on how share prices reacted to SEC enforcement actions against an affair of non-audit failure.

Details

Managerial Auditing Journal, vol. 34 no. 9
Type: Research Article
ISSN: 0268-6902

Keywords

Article
Publication date: 3 February 2014

Jerry Sun, George Lan and Guoping Liu

The purpose of this study is to investigate the effectiveness of independent audit committees in constraining real earnings management. This study examines the relationships…

7533

Abstract

Purpose

The purpose of this study is to investigate the effectiveness of independent audit committees in constraining real earnings management. This study examines the relationships between audit committee characteristics and real activities manipulation.

Design/methodology/approach

US firms with stronger incentives to undertake real earnings management are selected as a sample. Regressions are run for the empirical analyses.

Findings

It is found that audit committee members' additional directorships are positively associated with real earnings management measured by abnormal cash flows from operations, abnormal discretionary expenses and abnormal production costs, suggesting that audit committees with high additional directorships are less effective in constraining real earnings management. The findings are consistent with the notion that audit committee members' busyness impairs their monitoring effectiveness.

Originality/value

This study extends the extant research on audit committees' oversight of real earnings management by using refined research design and updated data. This study also provides further evidence on how audit committee members' additional directorships affect their ability to oversee both accrual and real earnings management.

Details

Managerial Auditing Journal, vol. 29 no. 2
Type: Research Article
ISSN: 0268-6902

Keywords

Article
Publication date: 31 January 2011

Jerry Sun and Guoping Liu

The purpose of this paper is to examine whether high analyst coverage increases or decreases accounting conservatism.

3843

Abstract

Purpose

The purpose of this paper is to examine whether high analyst coverage increases or decreases accounting conservatism.

Design/methodology/approach

Sample firms were selected from the Compustat and I/B/E/S databases for years 1989‐2006. The authors used both accrual‐based and market‐value‐based measures of accounting conservatism, also the extent to which negative cash flow from operations is more timely recognized via accruals than positive cash flow from operations to measure accounting conservatism. The regression analyses are conducted to test the hypotheses.

Findings

Strong evidence was found that analyst coverage is positively associated with accounting conservatism. The results suggest that firms choose more conservative accounting methods when they are followed by more analysts than when they are followed by fewer analysts. The results are robust to a battery of sensitivity analyses.

Originality/value

This paper sheds light on how analyst coverage affects firms' accounting choices and extends the limited research on the monitoring role of analyst coverage. The findings are consistent with the notion that analyst coverage plays an important corporate governance role in the financial reporting process. This paper also adds to the literature on the economic determinants of accounting conservatism, and provides some implications for practitioners.

Details

Managerial Finance, vol. 37 no. 1
Type: Research Article
ISSN: 0307-4358

Keywords

Article
Publication date: 20 April 2010

Guoping Liu and Jerry Sun

The purpose of this paper is to examine whether the type of ultimate controllers (i.e. private vs state) affects corporate disclosure quality and whether the relationship between…

1974

Abstract

Purpose

The purpose of this paper is to examine whether the type of ultimate controllers (i.e. private vs state) affects corporate disclosure quality and whether the relationship between the type of ultimate controllers and corporate disclosure quality is moderated by the separation of ownership and control.

Design/methodology/approach

This study employs the data of 405 Chinese listed firms in 2005. Annual reports were reviewed to collect the data including the type of ultimate owners, cash‐flow rights, and control rights; and the ratings of corporate disclosure quality were obtained from the Shenzhen Stock Exchange website. Ordered logistic regression tested the hypotheses.

Findings

It was found that corporate disclosure quality is lower for firms ultimately controlled by individuals than for firms ultimately controlled by the state. Also, the negative effect of private ultimate ownership on corporate disclosure quality is stronger for firms with high deviation of cash‐flow rights and control rights.

Practical implications

These findings suggest that privatizing state‐owned companies may increase the expropriation of minority shareholders by controlling shareholders if the privatization does not reduce the separation of cash‐flow rights from control rights. Thus, it may be necessary to strengthen the governance role of minority shareholders and constrain the divergence between cash‐flow rights and control rights of the ultimate owners when state‐owned companies are privatized.

Originality/value

This study contributes to the literature on the expropriation of minority shareholders by examining the main effect of the type of ultimate controllers and the interactive effect of ultimate ownership type and the divergence of ownership and control on corporate disclosure quality.

Details

Managerial Finance, vol. 36 no. 5
Type: Research Article
ISSN: 0307-4358

Keywords

1 – 10 of 38