Xiaojun Zhou, Lifeng Xi and Jay Lee
The purpose of this paper is to develop a dynamic opportunistic maintenance policy for a continuously monitored multi‐unit series system with integrating imperfect effect into…
Abstract
Purpose
The purpose of this paper is to develop a dynamic opportunistic maintenance policy for a continuously monitored multi‐unit series system with integrating imperfect effect into maintenance activities.
Design/methodology/approach
Based on the hybrid hazard rate recursion rule, an imperfect maintenance model for a continuously monitored single‐unit system was proposed. Then by introducing the “set‐up cost” concept, a dynamic opportunistic maintenance (OM) policy for multi‐unit‐series‐systems was developed. The optimal maintenance activities were determined by maximizing the short‐term cumulative OM cost saving for the continuously monitored system. A numerical example is given to show how the proposed dynamic OM policy proceeded.
Findings
The simulation results imply that the proposed policy is better than the policy to maintain the system units separately and the policy to maintain the system units together.
Practical implications
The proposed dynamic maintenance policy can fulfill the real plant environment that maintenance action is always imperfect and maintenance information is only available over a short term. Under this policy, the maintenance manager can easily and quickly adjust the maintenance schedule at any moment according to the working condition of the system.
Originality/value
The proposed model in this paper integrates the imperfect maintenance effect into condition‐based predictive maintenance, and the system maintenance schedule is dynamically determined based on the short‐term information of the system.
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Yunyun Yuan, Lifeng Yang, Xiangyang Cheng and Jia Wei
The purpose of this study is to examine the relationships among knowledge attributes (complexity and implicitness), interpersonal distrust, knowledge hiding (KH) and team efficacy…
Abstract
Purpose
The purpose of this study is to examine the relationships among knowledge attributes (complexity and implicitness), interpersonal distrust, knowledge hiding (KH) and team efficacy and second, to explore a new dimension of KH.
Design/methodology/approach
Data for this research were collected from more than 940 employees working in manufacturing, information technology (IT), finance and the purification industry. Structural equation modeling was used to test hypothesized relationships.
Findings
First, the research confirmed the existence of bullying hiding behaviors in the knowledge economy era based on “knowledge power.” Second, the findings suggest that knowledge attributes are an important predictor of KH behaviors in organizations. The findings implicate the mediating effect of interpersonal distrust and the moderating role of team efficacy, while team efficacy negatively moderated the relationships between interpersonal distrust with evasive hiding and playing dumb, but positively moderated the relationship between interpersonal distrust with rationalized hiding and bullying hiding.
Originality/value
This is the first study to propose bullying hiding, a behavior that has emerged in organizational knowledge transfer, and it is more detrimental to knowledge sharing than other KH behaviors. The results of research on the different regulating effects of team efficacy on KH behaviors enrich the boundary conditions of KH research.
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Held on October 30-31, it was attended by President Xi Jinping and various top officials. The conference formulated priority tasks to address financial risks the country is facing…
While some significant government personnel appointments remain to be confirmed, these can be expected to follow Xi’s preferences given his clean sweep of filling the Politburo…
Details
DOI: 10.1108/OXAN-DB273556
ISSN: 2633-304X
Keywords
Geographic
Topical
MA Jiao and WU Guoyuan
The paper is aimed to avoid the situation that historical relics are encroached, isolated and fragmented because of cities in the rapid urban process. Taking the environment…
Abstract
The paper is aimed to avoid the situation that historical relics are encroached, isolated and fragmented because of cities in the rapid urban process. Taking the environment around the Qinglong Temple in Xi'an city as an example and based on the characteristics of urban patterns in the history, this paper explores the spatial connection relationship between historical relics and surrounding villages as well as the connection between metro traffic and commercial bodies. At the end of the paper, the improvement strategy is put forward, namely the design concepts of “stepwise style” and “landscape style”, which can be achieved by the demand of ecological restoration and the relationship between urban axis. To be noted, the research shows, by restructuring new connection space, the city can promote the urban memory to be restored, the urban appearance to be reshaped, and the urban patterns in the history to be respected and displayed.
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The outcomes further tighten the grip of the Communist Party and President Xi Jinping personally over the government and the private economy. Increased representation of delegates…
Details
DOI: 10.1108/OXAN-DB277915
ISSN: 2633-304X
Keywords
Geographic
Topical
President Emmanuel Macron wants to maintain dialogue with President Xi Jinping as well as boost trade relations between the two countries. When it comes to defence and security…
Details
DOI: 10.1108/OXAN-DB281324
ISSN: 2633-304X
Keywords
Geographic
Topical
Abstract
Purpose
The promotion of new energy vehicles (EVs) is an effective way to achieve low carbon emission reduction. This paper aims to investigate the optimal pricing of automotive supply chain members in the context of dual policy implementation while considering consumers' low-carbon preferences.
Design/methodology/approach
This article takes manufacturers, retailers and consumers in a main three-level supply chain as the research object. Stackelberg game theory is used as the theoretical guidance. A game model in which the manufacturer is the leader and the retailer is the follower is established. The author also considered the impact of carbon tax policies, subsidy policies and consumer preferences on the results. Furthermore, the author investigates the optimal decision-making problem under the profit maximization model.
Findings
Through model solving, it is found that the pricing of EVs is positively correlated with the unit price of carbon and the amount of subsidies. The following conclusions can be obtained by numerical analysis of each parameter. Changes in carbon prices have a greater impact on conventional gasoline vehicles. Based on the numerical analysis of parameter β, it is also found that when the government subsidizes consumers, supply chain members will increase their prices to obtain partial subsidies. Compared with retailers, low-carbon preferences have a greater impact on manufacturers.
Research limitations/implications
The new energy automobile industry involves many policies, including tax cuts, tax exemptions and subsidies. The policy environment faced by the members of a supply chain is complex and diverse. Therefore, the analysis in this article is based only on partial policies.
Originality/value
The authors innovatively combine the three factors of subsidy policy, carbon tax policy and consumer low-carbon preference, with research on the pricing of EVs. The influence of policy factors and consumer preferences on the pricing of EVs is studied.
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Ziwang Xiao, Fengxian Zhu, Lifeng Wang, Rongkun Liu and Fei Yu
As an important load-bearing component of cable-stayed bridge, the cable-stayed cable is an important load-bearing link for the bridge superstructure and the load transferred…
Abstract
Purpose
As an important load-bearing component of cable-stayed bridge, the cable-stayed cable is an important load-bearing link for the bridge superstructure and the load transferred directly to the bridge tower. In order to better manage the risk of the cable system in the construction process, the purpose of this paper is to study a new method of dynamic risk analysis of the cable system of the suspended multi-tower cable-stayed bridge based on the Bayesian network.
Design/methodology/approach
First of all, this paper focuses on the whole process of the construction of the cable system, analyzes the construction characteristics of each process, identifies the safety risk factors in the construction process of the cable system, and determines the causal relationship between the risk factors. Secondly, the prior probability distribution of risk factors is determined by the expert investigation method, and the risk matrix method is used to evaluate the safety risk of cable failure quantitatively. The function expression of risk matrix is established by combining the probability of risk event occurrence and loss level. After that, the topology structure of Bayesian network is established, risk factors and probability parameters are incorporated into the network and then the Bayesian principle is applied to update the posterior probability of risk events according to the new information in the construction process. Finally, the construction reliability evaluation of PAIRA bridge main bridge cable system in Bangladesh is taken as an example to verify the effectiveness and accuracy of the new method.
Findings
The feasibility of using Bayesian network to dynamically assess the safety risk of PAIRA bridge in Bangladesh is verified by the construction reliability evaluation of the main bridge cable system. The research results show that the probability of the accident resulting from the insufficient safety of the cable components of the main bridge of PAIRA bridge is 0.02, which belongs to a very small range. According to the analysis of the risk grade matrix, the risk grade is Ⅱ, which belongs to the acceptable risk range. In addition, according to the reverse reasoning of the Bayesian model, when the serious failure of the cable system is certain to occur, the node with the greatest impact is B3 (cable break) and its probability of occurrence is 82%, that is, cable break is an important reason for the serious failure of the cable system. The factor that has the greatest influence on B3 node is C6 (cable quality), and its probability is 34%, that is, cable quality is not satisfied is the main reason for cable fracture. In the same way, it can be obtained that the D9 (steel wire fracture inside the cable) event of the next level is the biggest incentive of C6 event, its occurrence probability is 32% and E7 (steel strand strength is not up to standard) event is the biggest incentive of D9 event, its occurrence probability is 13%. At the same time, the sensitivity analysis also confirmed that B3, C6, D9 and E7 risk factors were the main causes of risk occurrence.
Originality/value
This paper proposes a Bayesian network-based construction reliability assessment method for cable-stayed bridge cable system. The core purpose of this method is to achieve comprehensive and accurate management and control of the risks in the construction process of the cable system, so as to improve the service life of the cable while strengthening the overall reliability of the structure. Compared with the existing evaluation methods, the proposed method has higher reliability and accuracy. This method can effectively assess the risk of the cable system in the construction process, and is innovative in the field of risk assessment of the cable system of cable-stayed bridge construction, enriching the scientific research achievements in this field, and providing strong support for the construction risk control of the cable system of cable-stayed bridge.
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Washington is attempting to limit a further deterioration in relations ahead of its November elections, while simultaneously stiffening tariffs on China amid an expanding…