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1 – 4 of 4Miaoxian Guo, Shouheng Wei, Chentong Han, Wanliang Xia, Chao Luo and Zhijian Lin
Surface roughness has a serious impact on the fatigue strength, wear resistance and life of mechanical products. Realizing the evolution of surface quality through theoretical…
Abstract
Purpose
Surface roughness has a serious impact on the fatigue strength, wear resistance and life of mechanical products. Realizing the evolution of surface quality through theoretical modeling takes a lot of effort. To predict the surface roughness of milling processing, this paper aims to construct a neural network based on deep learning and data augmentation.
Design/methodology/approach
This study proposes a method consisting of three steps. Firstly, the machine tool multisource data acquisition platform is established, which combines sensor monitoring with machine tool communication to collect processing signals. Secondly, the feature parameters are extracted to reduce the interference and improve the model generalization ability. Thirdly, for different expectations, the parameters of the deep belief network (DBN) model are optimized by the tent-SSA algorithm to achieve more accurate roughness classification and regression prediction.
Findings
The adaptive synthetic sampling (ADASYN) algorithm can improve the classification prediction accuracy of DBN from 80.67% to 94.23%. After the DBN parameters were optimized by Tent-SSA, the roughness prediction accuracy was significantly improved. For the classification model, the prediction accuracy is improved by 5.77% based on ADASYN optimization. For regression models, different objective functions can be set according to production requirements, such as root-mean-square error (RMSE) or MaxAE, and the error is reduced by more than 40% compared to the original model.
Originality/value
A roughness prediction model based on multiple monitoring signals is proposed, which reduces the dependence on the acquisition of environmental variables and enhances the model's applicability. Furthermore, with the ADASYN algorithm, the Tent-SSA intelligent optimization algorithm is introduced to optimize the hyperparameters of the DBN model and improve the optimization performance.
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Arash Arianpoor, Imad Taher Lamloom, Bita Moghaddampoor, Hameed Mohsin Khayoon and Ali Shakir Zaidan
The present study investigates the impact of managerial psychological characteristics on the supply chain management efficiency (SCME) of companies listed in Tehran Stock Exchange.
Abstract
Purpose
The present study investigates the impact of managerial psychological characteristics on the supply chain management efficiency (SCME) of companies listed in Tehran Stock Exchange.
Design/methodology/approach
To this aim, information about 215 companies was analyzed during 2014–2021. The sales per inventory ratio was used to calculate SCME. In the present study, the focus is on characteristics such as managerial entrenchment, managerial myopia, managerial overconfidence (MOC) and managerial narcissism, all considered as managerial attributes.
Findings
The present findings showed that managerial myopia/managerial entrenchment (MOC/managerial narcissism) have a negative (positive) effect on SCME. Hypothesis testing based on robustness checks confirmed these results. Moreover, the findings are presented separately for companies with high business strategy (first quarter) and low business strategy (third quarter). The results show that at low levels of differentiation strategy, managerial entrenchment does not have a significant effect on SCME while other managerial attributes have a significant effect on both high and low business strategy.
Originality/value
The present study contributes to the identification of managerial psychological characteristics influencing SCME to advance future studies and support practical efforts. The present findings can prove the significance of this research and fill the existing gap in research.
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This study aims to investigate the external effect of the economic growth target pressure of local governments on establishment-level SO2 emissions.
Abstract
Purpose
This study aims to investigate the external effect of the economic growth target pressure of local governments on establishment-level SO2 emissions.
Design/methodology/approach
Based on manually collected panel data of 74,058 China's industrial establishments and more than 330 thousand observations from CIED and ESR, the authors use a firm-fixed effect model, instrumental variables estimation and heterogeneity tests to identify the environmental externality of economic growth target pressure.
Findings
The establishments in cities that meet or slightly exceed the economic growth target experience greater negative externality measured by SO2 emission intensity. This external effect is more pronounced in regions: with a strict and overweighted target setting; with stronger officials' promotion incentives; with a low degree of marketization; and in firms with great economic importance. The authors identify the underlying mechanisms of dependence on dirty industry and the relaxation of environmental enforcement. And the environmental protection constraints in 2007 mitigate the negative externality.
Practical implications
The paper sheds light on to what extent economic growth target pressure has a negative externality of pollution in China and how this pressure may conflict with environmental protection.
Originality/value
This paper complements prior research on the economic effects of economic growth targets, expands the knowledge on the determinants of establishment-level pollution emission from the perspective of target pressure and provides insight into the environmental externality that results from political factors.
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Abdullah Kaid Al-Swidi, Mohammed A. Al-Hakimi, Jaafar Al-Sarraf and Ibraheem Saleh Al koliby
While the significance of green entrepreneurial orientation (GEO) has been acknowledged, it is still not fully understood how GEO influences green innovation (GI). Depending on…
Abstract
Purpose
While the significance of green entrepreneurial orientation (GEO) has been acknowledged, it is still not fully understood how GEO influences green innovation (GI). Depending on the natural resource-based view (NRBV), the practice-based view (PBV) and contingency theory (CT), the authors explore how GEO affects GI via green manufacturing practices (GMPs) and the moderating role of green technology turbulence (GTT).
Design/methodology/approach
Using the data gathered from large firms in Yemen, the suggested model was tested through hierarchical regression analysis using the PROCESS Macro in SPSS.
Findings
The empirical results reveal that GEO is positively related to GMP, which in turn is positively related to GI. Importantly, GMP mediates the link between GEO and GI. The results also demonstrate that GTT positively moderates the GEO-GI link.
Originality/value
This study makes a valuable contribution to the existing literature on sustainability and holds significant importance for managers seeking to enhance their understanding of utilizing GEO for fostering GI.
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