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1 – 10 of 237Yong Ding, Peixiong Huang, Hai Liang, Fang Yuan and Huiyong Wang
Recently, deep learning (DL) has been widely applied in various aspects of human endeavors. However, studies have shown that DL models may also be a primary cause of data leakage…
Abstract
Purpose
Recently, deep learning (DL) has been widely applied in various aspects of human endeavors. However, studies have shown that DL models may also be a primary cause of data leakage, which raises new data privacy concerns. Membership inference attacks (MIAs) are prominent threats to user privacy from DL model training data, as attackers investigate whether specific data samples exist in the training data of a target model. Therefore, the aim of this study is to develop a method for defending against MIAs and protecting data privacy.
Design/methodology/approach
One possible solution is to propose an MIA defense method that involves adjusting the model’s output by mapping the output to a distribution with equal probability density. This approach effectively preserves the accuracy of classification predictions while simultaneously preventing attackers from identifying the training data.
Findings
Experiments demonstrate that the proposed defense method is effective in reducing the classification accuracy of MIAs to below 50%. Because MIAs are viewed as a binary classification model, the proposed method effectively prevents privacy leakage and improves data privacy protection.
Research limitations/implications
The method is only designed to defend against MIA in black-box classification models.
Originality/value
The proposed MIA defense method is effective and has a low cost. Therefore, the method enables us to protect data privacy without incurring significant additional expenses.
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Talat Islam, Mubbsher Munawar Khan and Fida Hussain Bukhari
The purpose of this paper is to examine the association among organizational learning culture (OLC), psychological empowerment (PE), affective commitment (AC), organizational…
Abstract
Purpose
The purpose of this paper is to examine the association among organizational learning culture (OLC), psychological empowerment (PE), affective commitment (AC), organizational citizenship behavior and turnover intention.
Design/methodology/approach
This study was undertaken via a questionnaire conducted among Malay-Chinese working in banking and insurance sector of Malaysia.
Findings
PE and OLC were found to influence employee’s citizenship behavior toward their organization and turnover intention. In addition, AC was found to perform the role of mediator between them.
Research Limitations/implications
The study used self-reported data based on a cross-sectional survey. The study has implications for the managers.
Practical Implications
OLC and PE were found to influence turnover intention directly and indirectly, providing an avenue of approach for managers to retain its key employees.
Originality/value
The paper examines the consequences of OLC and PE, neglected variables along with the mediation of AC.
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Talat Islam, Saif Ur Rehman Khan, Ungku Norulkamar Bt. Ungku Ahmad, Ghulam Ali and Ishfaq Ahmed
The purpose of this paper was to investigate the relationship among organizational learning culture (OLC), psychological empowerment (PE), job satisfaction, affective…
Abstract
Purpose
The purpose of this paper was to investigate the relationship among organizational learning culture (OLC), psychological empowerment (PE), job satisfaction, affective organizational commitment and turnover intention, as very little has been conducted in this regard.
Design/methodology/approach
A quantitative research design was used via a questionnaire among 412 Malay-Chinese working in the banking and insurance sector of Malaysia.
Findings
OLC and PE were found to influence positively on job satisfaction and affective commitment, but negatively on turnover intention. In addition, job satisfaction was found to perform the role of mediator.
Research limitations/implications
The study used self-reported data based on cross-sectional survey.
Practical implications
OLC and PE were found to influence affective commitment and turnover intention directly and indirectly, providing an avenue of approach for managers to retain their key employees.
Originality/value
The paper examines OLC and PE as antecedents of employees’ attitudes (i.e. job satisfaction, affective commitment and turnover intention), neglected variables along with the mediation of job satisfaction.
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Wajda Wikhamn and Marcus Selart
The purpose of this paper is to investigate the extent to which psychological empowerment and felt obligation can explain variations in personal initiative.
Abstract
Purpose
The purpose of this paper is to investigate the extent to which psychological empowerment and felt obligation can explain variations in personal initiative.
Design/methodology/approach
Employees from a Swedish organization participated in a web-based survey.
Findings
Psychological empowerment is important for enhancing proactive behavior at work, but its dimensions relate differently to personal initiative. Felt obligation mediates the relationship between psychological empowerment and personal initiative, but only for two dimensions of empowerment (meaningfulness and competence).
Originality/value
The paper contributes to our understanding of how employees’ feeling of obligation explains one form of proactive behavior. It also highlights the overlooked distinctiveness of psychological empowerment dimensions in predicting personal initiative at work.
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Xie Yizhong, Yevhen Baranchenko, Zhibin Lin, Chi Keung Lau and Jie Ma
The purpose of this paper is to examine the mediating role of job characteristics and social exchange in transformational leadership (TFL) and employability relationship.
Abstract
Purpose
The purpose of this paper is to examine the mediating role of job characteristics and social exchange in transformational leadership (TFL) and employability relationship.
Design/methodology/approach
The sample is composed of 760 participants employed in Yangtze Delta and Pearl River Delta in China. The participants have worked under their line manager for more than one year. In order to better prevent data from possible common method bias, two waves of surveys (in 2014) on a stratified sample, included a mix of industries, such as construction, manufacturing, finance, insurance and communications, were used to investigate the proposed relationship between TFL, job characteristics, social exchange and employability.
Findings
The research has empirically tested the relationship between TFL and employability. While previous research has analyzed the relationship between them, the authors have enriched existing literature by exploring the mediating factors and illustrating the importance of indirect effects. Besides the direct effect, the results of this study showed that TFL could also improve employees’ employability through job demands, skill discretion, decision authority, perceived organizational support and team–member exchange, but not leader–member exchange.
Originality/value
The study opens up a debate around the employability of employees as it stands apart from the performance measurement. The authors believe that this new mediating model can provide an insight into complex mechanisms of employability enhancement from the perspective of leader development.
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Amir Samadi, Reza Amini, Mehran Rostami, Pooneh Kardar and Michele Fedel
The purpose of this study was to evaluate the possibility of using conductive polymers such as polyaniline (PANI) as corrosion inhibitors for metals.
Abstract
Purpose
The purpose of this study was to evaluate the possibility of using conductive polymers such as polyaniline (PANI) as corrosion inhibitors for metals.
Design/methodology/approach
In this study, the effect of the addition of praseodymium (Pr3+) cations on the corrosion inhibition performance of PANI for AZ31 magnesium alloy was appraised through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests.
Findings
The results of EIS and potentiodynamic polarization tests indicated the improvement of corrosion resistance of AZ31 during different immersion times.
Research limitations/implications
This anti-corrosion ability of PANI/Pr3+ composite applies as non-toxic environmentally friendly corrosion inhibitor on the self-healing corrosion protection properties.
Practical implications
The conductive polymers are interested for many industries. The reported data can be used by the formulators working in the R&D departments.
Social implications
The anti-corrosion ability of PANI/Pr3+ composite present a novel and high effective route against metal corrosion besides application of toxic corrosion.
Originality/value
The application of titanium dioxide coating in the field of architectural heritage is a great challenge. Therefore, the main objective of this study is to study the synthesis, characterization and corrosion inhibition performance of Pr3+ cations doped PANI nano-fibers as an anti-corrosion additive for AZ31 magnesium alloy in 3.5 Wt.% NaCl solution.
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Agnieszka Chmielewska, Bartlomiej Adam Wysocki, Elżbieta Gadalińska, Eric MacDonald, Bogusława Adamczyk-Cieślak, David Dean and Wojciech Świeszkowski
The purpose of this paper is to investigate the effect of remelting each layer on the homogeneity of nickel-titanium (NiTi) parts fabricated from elemental nickel and titanium…
Abstract
Purpose
The purpose of this paper is to investigate the effect of remelting each layer on the homogeneity of nickel-titanium (NiTi) parts fabricated from elemental nickel and titanium powders using laser powder bed fusion (LPBF). In addition, the influence of manufacturing parameters and different melting strategies, including multiple cycles of remelting, on printability and macro defects, such as pore and crack formation, have been investigated.
Design/methodology/approach
An LPBF process was used to manufacture NiTi alloy from elementally blended powders and was evaluated with the use of a remelting scanning strategy to improve the homogeneity of fabricated specimens. Furthermore, both single melt and up to two remeltings were used.
Findings
The results indicate that remelting can be beneficial for density improvement as well as chemical and phase composition homogenization. Backscattered electron mode in scanning electron microscope showed a reduction in the presence of unmixed Ni and Ti elemental powders in response to increasing the number of remelts. The microhardness values of NiTi parts for the different numbers of melts studied were similar and ranged from 487 to 495 HV. Nevertheless, it was observed that measurement error decreases as the number of remelts increases, suggesting an increase in chemical and phase composition homogeneity. However, X-ray diffraction analysis revealed the presence of multiple phases regardless of the number of melt runs.
Originality/value
For the first time, to the best of the authors’ knowledge, elementally blended NiTi powders were fabricated via LPBF using remelting scanning strategies.
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Hai-Yen Chang, Li-Heng Liang and Hui-Fun Yu
This study aims to understand the impact of market power and competition on earnings management, particularly discretionary accruals, in the Chinese and Taiwanese tourism…
Abstract
Purpose
This study aims to understand the impact of market power and competition on earnings management, particularly discretionary accruals, in the Chinese and Taiwanese tourism industries. China and Taiwan differ not only in their political and social systems but also in their economic systems. The research aims to provide managers and investors with stock selection strategy in the decision-making process.
Design/methodology/approach
Accounting data consisted of 60 publicly traded travel companies in China and Taiwan from 2000 to 2014. Methodology included correlation matrix for the variables, univariate and multivariate regression and competition analysis.
Findings
Based on empirical results, the authors found a significant negative correlation between market power and discretionary accruals and market concentration (or lower market competition) and discretionary accruals in both the Chinese or Taiwanese markets. Although the Chinese travel companies enjoyed higher market power and market concentration, they engaged in less earnings manipulation than their Taiwanese counterparts as a result of the Chinese Government regulation.
Research limitations/implications
Based on listed travel companies, generalization of the research results to entire tourism industry is limited. This study compares the travel companies’ practices of smoothing out earnings between China and Taiwan, thus helping managers and investors in making their financing, investment decisions.
Originality/value
This research contributes to the earnings management literature by examining a specific industry of tourism. This paper is original in two ways. The authors linked market power and market competition with earnings management simultaneously and then compared the Chinese and Taiwanese tourism industries in manipulating earnings.
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Zhang Hai-ou, Rui Wang, Liye Liang and Wang Gui-lan
The paper aims to introduce the fabrication of a medium steel aircraft part by hybrid deposition and micro-rolling technology (HDMR) and illustrate its advantages, microstructure…
Abstract
Purpose
The paper aims to introduce the fabrication of a medium steel aircraft part by hybrid deposition and micro-rolling technology (HDMR) and illustrate its advantages, microstructure features and mechanical properties of the part.
Design/methodology/approach
The HDMR technology contains two procedures happening almost at the same time: the welding deposition procedure and then the micro-rolling procedure. It takes the gas metal arc welding as the heat source to melt a metal wire and deposit metal in the welding deposition procedure. The metal just deposited is rolled synchronously by a micro roller following the welding torch in micro-rolling procedure almost at the same time layer by layer. The paper presents a contrast of the grain morphology of metal parts produced respectively by HDMR and freedom arc deposition (FAD) and the mechanical properties of metal parts of the same metal from HDMR casting, forging and FAD methods.
Findings
HDMR breaks the dendrite grain of welding beads into the fine crisscross grains. The mechanical properties of metal parts are improved distinctly by the micro-rolling procedure compared to casting, forging and FAD.
Practical implications
In addition, the application of HDMR technology has succeeded in the fabrication of an eligible aircraft metal part, which is quite difficult to achieve using other additive manufacturing (AM) or casting technologies.
Originality/value
HDMR has the advantage of equiponderance manufacturing by micro-rolling compared to other AM technologies. The metal part fabricated by HDMR technology obtains the fine crisscross grains and brings hope for AM metal components with excellent mechanical properties for aircraft applications.
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