Search results

1 – 10 of over 2000
Article
Publication date: 14 March 2018

Ting Li, Jinsheng Zhang, Shicheng Wang, Dongyu Li, Zhifeng Lv and Jiangjun Jiang

This study aims to find a novel solution to the calibration of three-axis magnetometers to suppress errors of sensors. The nature of the calibration process is parameter…

Abstract

Purpose

This study aims to find a novel solution to the calibration of three-axis magnetometers to suppress errors of sensors. The nature of the calibration process is parameter estimation and hence the purpose of the paper is to calculate the error parameters and eliminate sensor errors and obtain the true value of the pure magnetic field.

Design/methodology/approach

The paper puts forward a calibration method using an alternative iteration looping optimization (AILO) to estimate the parameters. The proposed method divided the parameters to be estimated into two parts: a portion less than one and the other greater than one. Parameters with different orders of magnitude are calculated respectively, which let one part to be a known quantity and the other part is derived by the known quantity; the derived quantity is used to calculate the known quantity again, and looping iteration multiple times until the iteration termination condition is satisfied.

Findings

The simulation and experimental results indicate that the calibration accuracy is improved at least by two orders by the proposed method compared to the two-step method and the linear decreasing weight particle swarm optimization (LDW-PSO) algorithm which proves the validity of the proposed method.

Practical implications

The proposed method can improve the calibration accuracy of total magnetic field, which provides a reference to the calibration of three-axis magnetometers.

Originality/value

A calibration method based on the AILO is proposed in this paper, which is used to improve the calibration accuracy of the three-axis magnetometer.

Details

Sensor Review, vol. 38 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 5 June 2017

Yeqing Tao, Dongyan Ding, Ting Li, Jason Guo and Guoliang Fan

This paper aims to study the influence of reflow atmosphere and placement accuracy on the solderability of 01005 capacitor/SAC305 solder joints.

Abstract

Purpose

This paper aims to study the influence of reflow atmosphere and placement accuracy on the solderability of 01005 capacitor/SAC305 solder joints.

Design/methodology/approach

The 01005 capacitors were mounted on OSP-coated pads, and the samples were fabricated in four different atmospheres, i.e. 200 ppm O2/N2, 1,000 ppm O2/N2, 3,000 ppm O2/N2 and air. After the reflow process, visual inspection and X-ray detection were carried out to examine the solder joint shapes and possible defects. Some of the samples fabricated in different conditions were cross-sectioned and the solder joint microstructures were analyzed. On the other hand, besides placing the components on their normal pad positions, a 50 per cent offset of the x-axis (long axis) or y-axis (short axis) was introduced into the chip mounter programs to evaluate the 01005 capacitor’s assembly sensitivity to placement accuracy. The process-induced defects were investigated.

Findings

Experimental results indicated that an N2-based protective atmosphere was necessary for 01005 type assembly, as it could obviously improve the 01005 solder joint quality, compared with the air condition. The protective atmosphere had little effect on the appearance, quality and microstructure of solder joints when the oxygen concentration was below 3,000 ppm. But a very low oxygen concentration could increase the risk of tombstoning defects for the assembly process. The N2-based protective atmosphere containing 1,000-2000 ppm O2 was acceptable and appropriate for the assembly of tiny components.

Originality/value

The results of this work provide a set of reflow process parameters and recommendations for 01005 size component assembly in manufacturing.

Details

Soldering & Surface Mount Technology, vol. 29 no. 3
Type: Research Article
ISSN: 0954-0911

Keywords

Article
Publication date: 5 August 2020

Shuangliang Tai, Yao Zhang and Ting Li

The purpose of this paper is to promote the application of building information modeling (BIM) in China’s construction industry, key factors and their relationships are explored.

Abstract

Purpose

The purpose of this paper is to promote the application of building information modeling (BIM) in China’s construction industry, key factors and their relationships are explored.

Design/methodology/approach

Based on a literature review, 28 factors were extracted and their relationships (239 in total) obtained using the Delphi method. A social network model of the factors was constructed and factors were analyzed using social network analysis (SNA).

Findings

The top 10 key factors and their relationships were obtained using SNA. Among the top 10 critical factors, six were source factors. They were: training for the application of BIM, guidance from experts, proper management modes, efficient BIM teams, specifications and demonstrations and standards for building information communication. The other four factors included as follows: a willingness to accept BIM, knowledge of its value and benefits, the definition of its benefits and the availability of IT software and hardware. These were mediating factors that could further the influence of the source factors.

Originality/value

The results provide useful information for public agencies and professionals to understand the immediate and mediating influences of the factors on the application of BIM. Solutions and future efforts for different participants are presented to promote the application of BIM-based on the key factors and their relationships.

Details

Journal of Engineering, Design and Technology , vol. 19 no. 2
Type: Research Article
ISSN: 1726-0531

Keywords

Article
Publication date: 30 June 2020

Kaili Yao, Dongyang Chu, Ting Li, Zhanli Liu, Bao-Hua Guo, Jun Xu and Zhuo Zhuang

The purpose of this paper is to calculate the Hugoniot relations of polyurea; also to investigate the atomic-scale energy change, the related chain conformation evolution…

Abstract

Purpose

The purpose of this paper is to calculate the Hugoniot relations of polyurea; also to investigate the atomic-scale energy change, the related chain conformation evolution and the hydrogen bond dissociation of polyurea under high-speed shock.

Design/methodology/approach

The atomic-scale simulations are achieved by molecular dynamics (MD). Both non-equilibrium MD and multi-scale shock technique are used to simulate the high-speed shock. The energy dissipation is theoretically derived by the thermodynamic and the Hugoniot relations. The distributions of bond length, angle and dihedral angle are used to characterize the chain conformation evolution. The hydrogen bonds are determined by a geometrical criterion.

Findings

The Hugoniot relations calculated are in good agreement with the experimental data. It is found that under the same impact pressure, polyurea with lower hard segment content has higher energy dissipation during the shock-release process. The primary energy dissipation way is the heat dissipation caused by the increase of kinetic energy. Unlike tensile simulation, the molecular potential increment is mainly divided into the increments of the bond energy, angle energy and dihedral angle energy under shock loading and is mostly stored in the soft segments. The hydrogen bond potential increment only accounts for about 1% of the internal energy increment under high-speed shock.

Originality/value

The simulation results are meaningful for understanding and evaluating the energy dissipation mechanism of polyurea under shock loading, and could provide a reference for material design.

Details

Engineering Computations, vol. 38 no. 3
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 14 May 2019

Ting Li, Xinlei Zhao and Aiwu Zhao

Motivated by managers’ intentions to pursue private interests by engaging in earnings management, this paper aims to investigate whether voting with hands (shareholders…

Abstract

Purpose

Motivated by managers’ intentions to pursue private interests by engaging in earnings management, this paper aims to investigate whether voting with hands (shareholders cast votes on shareholder proposals) by shareholders acts as an external disciplining mechanism over earnings management relative to corporate governance. Also, as corporate governance can scrutinize managers’ behavior, this study also examines whether there is a substitutive relation between shareholder proposals and corporate governance mechanism.

Design/methodology/approach

First, this paper uses ordinary least squares (OLS) regressions of discrepancy accruals on the percentage of “For” votes for shareholder proposals to test the incremental effect of shareholder proposals on earnings management. Second, firms receiving shareholder proposals are matched with those not receiving proposals by propensity scores, and the levels of earnings management and corporate governance between these two groups are compared by univariate analysis and OLS regressions. In addition, six portfolios are created based on whether firms receive shareholder proposals, as well as on the levels of corporate governance, to assess whether external control from shareholder proposals can substitute internal control for corporate governance in disciplining earnings management. Regressions of earnings management on corporate governance (shareholder proposals) are conducted in the sub-samples formed on shareholder proposals (corporate governance) to further explore the above substitution effects.

Findings

Based on a sample of 2,041 firm-year observations from 2001 to 2010, this paper finds that the “For” votes received from the shareholder proposals have a significant negative relationship with the practice of earnings management, even when corporate governance is controlled. The negative relationship between shareholder proposal and magnitude of earnings management is also found to be stronger when firms have weak corporate governance. The overall evidence suggests that the external control from “voting-with-hand” shareholders has a significant impact on earnings management. In addition, shareholder proposals can substitute the monitoring mechanism for corporate governance in constraining managers’ myopic behavior.

Originality/value

This paper contributes to the extant literature by using the percentage of “For” votes for shareholder proposals as a proxy for shareholder pressure and concerns. This study contributes to the earnings management literature by showing the disciplinary effect of outside shareholders on managers’ reporting behavior. Also, it contributes to the corporate governance research by presenting that shareholder proposals can substitute for the internal control of corporate governance in decreasing earnings management. This paper should be of interest to investors and standard setters.

Details

Review of Accounting and Finance, vol. 18 no. 2
Type: Research Article
ISSN: 1475-7702

Keywords

Book part
Publication date: 24 August 2011

Tommy Tsung Ying Shih

Researchers continue to seek understanding of industrialization as a state managed process. How to create and implement new industries based on advanced knowledge is on…

Abstract

Researchers continue to seek understanding of industrialization as a state managed process. How to create and implement new industries based on advanced knowledge is on the policy agenda of many advanced nations. Measures that promote these developments include national capacity building in science and technology, the formation of technology transfer systems, and the establishment of industrial clusters. What these templates often overlook is an analysis of use. This chapter aims to increase the understanding of the processes that embed new solutions in structures from an industrial network perspective. The chapter describes an empirical study of high-technology industrialization in Taiwan that the researcher conducts to this end. The study shows that the Taiwanese industrial model is oversimplified and omits several important factors in the development of new industries. This study bases its findings on the notions that resource combination occurs in different time and space, the new always builds on existing resource structures, and the users are important as active participants in development processes.

Details

Interfirm Networks: Theory, Strategy, and Behavior
Type: Book
ISBN: 978-1-78052-024-7

Keywords

Abstract

Details

Globalization, Political Economy, Business and Society in Pandemic Times
Type: Book
ISBN: 978-1-80071-792-3

Article
Publication date: 1 March 1999

Suzana Firmansyah and Brian H. Kleiner

Indicates the number of people in the USA who have contracted HIV or AIDS. Looks at discrimination against people with HIV or AIDS in the US workplace, setting out their…

Abstract

Indicates the number of people in the USA who have contracted HIV or AIDS. Looks at discrimination against people with HIV or AIDS in the US workplace, setting out their legal protection and the obligation set upon employers not to discriminate against them. Assesses the implications of this for employers’ benefits plans and human resource practices. Outlines the policies and procedures that employers should adopt to make sure that there is no discrimination against people with HIV or AIDS in the workplace.

Details

Equal Opportunities International, vol. 18 no. 2/3/4
Type: Research Article
ISSN: 0261-0159

Keywords

Article
Publication date: 20 April 2012

Weifeng Wu, Jian Li, Ting Li, Quanke Feng and Xiaoling Yu

The purpose of this paper is to find a solution of laminar liquid flow in asymmetric narrow channels. In many cases, an intuitive solution is much more useful and…

Abstract

Purpose

The purpose of this paper is to find a solution of laminar liquid flow in asymmetric narrow channels. In many cases, an intuitive solution is much more useful and necessary for engineering applications, although numerical solutions can be obtained.

Design/methodology/approach

The Navier‐Stokes equations of laminar liquid flow in asymmetric narrow channels are simplified based on geometric characteristics of narrow channels, physical characteristics of liquid and boundary conditions. The simplified Navier‐Stokes equations are solved theoretically. Verification of the obtained results is carried out based on comparing with the Jeffery‐Hamel flow, which is an exact solution of liquid flow in convergent or divergent channels proposed by Jeffery.

Findings

This paper proposed an intuitive solution of laminar liquid flow in asymmetric narrow channels. Obtained results show that the solution can provide a fairly precise flowrate, when a ratio between the width of the channel and the curvature of the boundary of the asymmetry channel is smaller than 0.2936/Re. Furthermore, the obtained solution of pressure distribution along the channel shows high enough accuracy, even though the Reynolds number reaches to higher than 105.

Research limitations/implications

Because the authors assumed the width of the channel is far smaller than the curvature of the boundary of the asymmetric channel, the obtained results could only fit finite cases. Because the Navier‐Stocks equations were finally simplified into one‐dimensional, it is impossible to forecast separation flows; so the obtained results will fail when the Re number is too big. However, experiments should be carried out further to verify these problems.

Originality/value

This paper proposes an intuitive solution of laminar liquid flow in asymmetric narrow channels, including the pressure distribution along the channel.

Details

Industrial Lubrication and Tribology, vol. 64 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 27 April 2010

Kuo‐Chung Chang, Ting Lie and Ming‐Liang Fan

The purpose of this paper is to advance our understanding of the concept of system usage and identify determinants at the organizational level that are attributable to the…

1198

Abstract

Purpose

The purpose of this paper is to advance our understanding of the concept of system usage and identify determinants at the organizational level that are attributable to the extent of system usage in the post‐adoptive and compulsory milieu.

Design/methodology/approach

The paper intends to examine the organizational intervention on system usage extent. Unlike previous studies, this research adopts a feature‐centered approach to examine the construct of system usage extent, and proposes that organizational supports such as management support and technical support impact the individual system usage extent.

Findings

Results show that technical support from the organization, specifically technical assistance and technical consulting channels, have a positive impact on system usage extent; however, management support does not show a significant effect. A post hoc analysis is conducted in an attempt to explicate the relationships between organization interventions and the feature usage of particular systems.

Originality/value

The paper has the following implications. First, this study discusses system usage extent from a feature‐centered perspective and develops a method to assess the degree of system usage. Second, the scheme for evaluating system usage extent developed in our study can be used to measure the actual system usage. Lastly, an ad hoc correlation analysis was performed to provide a detailed understanding of the relationship between organizational initiatives.

Details

Industrial Management & Data Systems, vol. 110 no. 4
Type: Research Article
ISSN: 0263-5577

Keywords

1 – 10 of over 2000