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Determining Inspection Intervals for One-shot Systems with Support Equipments
Qian Qian Zhao,Won Young Yun 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
In this paper, we consider one-shot systems comprise one-shot devices and support equipments. The one-shot devices are stored for long periods of time, and its failure is detected only upon inspection. Support equipments are necessary for the operation of one-shot devices, and are maintained immediately upon failure. This paper deals with an inspection schedule problem for one-shot systems with support equipment and limited maintenance resources. Interval availability and life cycle costs are used as optimization criteria, and are estimated by simulation. Therefore, we aim to determine near-optimal inspection intervals of one-shot systems that minimize the expected life cycle cost and satisfy the target interval availability during inspection periods. An estimation of distribution algorithm (EDA) is proposed to find near-optimal solutions, and numerical examples are studied to investigate the effects of various model parameters.
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디지털 기업에서 직무 자율성이 팀 성과에 미치는 영향 연구
Qianli Zhao,장경풍 인문사회 21 2022 인문사회 21 Vol.13 No.3
Research on the Influence of Job Autonomyon Team Performance in Digital EnterprisesQianli Zhao & Qingfeng Zhang Abstract: In order to enhance work motivation and personal interests for new generation of employees, it is important to support job autonomy and effectively improve team performance, so as to strengthen the competitive advantage of digital enterprises. This paper conducted a multi-stage and multi-regional questionnaire survey with 300 participants in digital enterprises. We have used SPSS 25.0 and AMOS 24.0 for linear regression analyses and intermediary effect test. Based on organization learning theory, the empirical results show that job autonomy has the significant positive effect on team performance in digital enterprises. The learning organization and flexible working schedule play mediating roles in this influence relationship. Future research should further explore the moderating variables to further enrich the theoretical model and research results. Key Words: Job Autonomy, Team Performance, Digital Enterprises, Learning Organization, Flexible Working Schedule Research on the Influence of Job Autonomy on Team Performance in Digital Enterprises Qianli Zhao & Qingfeng Zhang Abstract: In order to enhance work motivation and personal interests for new generation of employees, it is important to support job autonomy and effectively improve team performance, so as to strengthen the competitive advantage of digital enterprises. This paper conducted a multi-stage and multi-regional questionnaire survey with 300 participants in digital enterprises. We have used SPSS 25.0 and AMOS 24.0 for linear regression analyses and intermediary effect test. Based on organization learning theory, the empirical results show that job autonomy has the significant positive effect on team performance in digital enterprises. The learning organization and flexible working schedule play mediating roles in this influence relationship. Future research should further explore the moderating variables to further enrich the theoretical model and research results. Key Words: Job Autonomy, Team Performance, Digital Enterprises, Learning Organization, Flexible Working Schedule
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Qian Zhao,Tingshun Jiang,Changsheng Li,Hengbo Yin 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2
Ni-loading MCM-41 mesoporous molecular sieve (Ni/MCM-41) and Ni-substituted MCM-41 mesoporous molecular sieve (Ni-MCM-41) were synthesized by wet impregnation method and hydrothermal method, respectively. Their mesoporous structures were evaluated by X-ray diffraction (XRD) and N2physical adsorption technique. Chemical vapor deposition (CVD) was employed to catalytically synthesize carbon nanotubes (CNTs) using Ni-MCM-41 or Ni/MCM-41 as catalyst via pyrolysis of ethanol at atmospheric pressure and 700 8C. The resulting carbon nanotubes were characterized by means of transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM)and Raman spectroscopy, respectively. The results show that the multi-wall carbon nanotubes (MWCNTs) were successfully obtained at 700 8C utilizing NiMCM-41 (or Ni/MCM-41) as a catalytic template by the pyrolysis of ethanol. MWCNTs obtained over Ni-MCM-41 catalyst have uniform diameter and high quality. On the other hand, the technique has great advantages such as low cost and easy operation for the preparation of carbon nanotubes.
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Qian Yin,Lu Qian,Pingping Song,Tunyu Jian,Zhao-Jun Han 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.1
Based on the confirmation of asymmetrical cross-resistance between abamectin and tebufenozide in Plutella xylostella, the present work proved that the cytochrome P450 monooxygenase plays a decisive role in crossresistance, and the expression of various cytochrome P450 (CYP450) genes in different strains was surveyed to elucidate the molecular basis of the underlying mechanisms. Enzyme analysis showed the activity of cytochrome P450 monooxygenase was notable enhanced in the strains resistant to both tebufenozide (3.07-fold) and abamectin (3.37-fold), suggesting that the enhancement of cytochrome P450 monooxygenase is the main detoxification mechanism responsible for the cross-resistance. CYP4M7 (64.58-fold) and CYP6K1 (41.97-fold) had extremely high expression levels in the Teb-R strain, selected using tebufenozide, which was highly resistant to tebufenozide (RR 185.5) and moderately cross-resistant to abamectin (RR 41.0). When this strain was subjected to further selection using abamectin, the resultant Aba-R strain showed a higher expression of CYP6K1 (60.32-fold). However, the expression of CYP4M7 was reduced (10.62-fold). Correspondingly, the Aba-R strain became more resistant to abamectin (RR 593.8) and less resistant to tebufenozide (RR 28.0). Therefore, we concluded that the over expression of CYP4M7 was the main cause for tebufenozide resistance, and that CYP6K1 mainly conferred abamectin resistance. The asymmetrical cross-resistance occurred because tebufenozide selection not only enhanced the expression of CYP4M7, but also that of CYP6K1. This is the first report on the molecular mechanism of asymmetrical cross-resistance between insecticides.
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Qian Zhao,Qian Wang,Duolin Wu,Xiaoqi Fu,Tingshun Jiang,Hengbo Yin 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
Several SO42-/Zr-MCM-41 and SO42-/Zr-MCM-48 solid acid catalysts were prepared by wet impregnation method and were characterized by FT-IR, XRD, NH3-TPD and N2 physical adsorption,respectively. The catalytic activities of these catalysts were evaluated in alkylation reaction of phenol and tert-butyl alcohol. Experimental results reveal that the four solid acid catalysts still maintained a typical mesoporous framework. Under comparable condition, the SO42-/Zr-MCM-48-25 catalyst exhibits much high catalytic activity and gives the highest phenol conversion as compared with the other catalysts. A maximum phenol conversion of 91.6% with 81.8% selectivity to 4-tert-butylphenol (4-TBP) was achieved at the reaction temperature of 140 8C. 2012 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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Microstructure Change of Nanosilica-Cement Composites Partially Exposed to Sulfate Attack
Qian Huang,Liang Zhao,Chenggong Zhao,Dongsheng Liu,Chaoqiang Wang 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.3
The deterioration of cement composites containing nanosilica partially exposed to sulfate attack was studied, and the microstructure change of the composites was analysed by a scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results showed that nanosilica-cement composites had better sulfate resistance compared to plain cement composite under partial exposure to sulfate attack, and their sulfate resistance increased as the nanosilica content increased (in the range of 0 to 5 wt% replacing cement by weight). The main sulfate products were gypsum and ettringite within the surface and inner parts, respectively in both the immersed and evaporation portions of the nanosilica-cement composites, which was consistent with the plain cement composite. Thus, the incorporation of nanosilica did not change the distribution characteristics of the sulfate products within the composites partially exposed to sulfate attack. However, the addition of nanosilica reduced the amount of sulfate products in both the immersed and evaporation portions, and their amount decreased with the increase of nanosilica content. The evaporation portions of the composites suffered chemical sulfate attack rather than sulfate salt crystallization. Nanosilica-cement composites could be applied in real partial exposure environments containing sulfate ions.
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CARC: A Reliable Routing Mechanism for Cognitive Ad Hoc Networks
Qian Zhao,Guangsheng Feng,Chen Zheng 보안공학연구지원센터 2014 International Journal of Future Generation Communi Vol.7 No.6
In cognitive radio Ad Hoc networks, the events of node failure and link failure maybe happen frequently, especially the primary users will access the authorized channel whenever possible. In order to maintain the connection between cognitive users and resume their communication as soon as possible when the current route is invalid, a reliable routing mechanism CARC is proposed, which employs primary and candidate route to communicate under differential cases. Meanwhile, how to choose candidate route, maintain or rebuild route are also elaborated. Numerical simulations show that the proposed CARC protocol has a higher performance compared with other typical protocols.
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