SACM - Australia
Permanent URI for this collectionhttps://drepo.sdl.edu.sa/handle/20.500.14154/9648
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Item Restricted An Integrated Methodology for Non-Destructive Reliability Assessment of Remanufactured Components(The University of New South Wales, 2024-10) Aloqaibi, Yasser Owaitiq; Kara, Sami; Wang, ChunReliability assessment is a quality measure that has been used in industry for a long time. It is used as a quantified indicator to determine the probability of a component performing its function properly for a given period. Assessing the reliability of a remanufactured component becomes a key factor in determining the success of remanufacturing industry. The aim of this research was to provide a data-driven and integrated methodology to evaluate the reliability of a remanufactured component in a non-destructive way. To achieve this research objective, a methodology was presented for an accurate and empirical reliability assessment of remanufactured components. The proposed methodology was constructed using available historical data collected during the initial life cycle of a given component. From these collected data sets, a degradation model of the component was built to represent the inevitable deterioration of the component’s performance. One of the significant modules of the methodology was estimating the outcomes of a proposed remanufacturing process. A mathematical and digital simulation approach provided an integrated method to estimate the outcomes of the proposed remanufacturing process. To develop the robustness of the proposed methodology, a statistical model development scheme was implemented to provide a mean value and predicted interval analysis. This model provided a distribution-based estimation for the component’s failure characteristics. Ultimately, the reliability assessment of remanufactured components can be calculated properly using empirical and actual parameters. This methodology was validated by conducting two case studies with different remanufacturing processes. The conclusion of this study represented a promising approach to predicting the reliability of remanufactured components in a non-destructive way. This methodology could be also capable of incorporating other remanufacturing processes and supporting the decision-making process. Furthermore, it was able to facilitate the technical decisions of conducting a specific process parameter to improve the result of the remanufacturing process. The advantage of remanufactured components was measured by assessing their reliability.24 0Item Restricted OPTIMISING RESOURCE ALLOCATION AND OFFLOADING FOR LONG-TERM LOAD BALANCING SOLUTIONS IN FOG COMPUTING NETWORKS(University of Technology Sydney, 2024-02-02) Sulimani, Hamza; Prasad, MukeshNowadays, most emerging critical IoT applications have unique requirements and restrictions to operate efficiently; otherwise, they could be useless. Latency is one of these requirements. Fog computing (FC) is the complement system for cloud computing, proving it is the ideal computing environment for critical IoT applications. Distributed computing systems, such as FC, have an inherent problem when the computing units have different computing loads, called load difference problems. Offloading and service placement are some techniques used to fix these problems. Although prevalent offloading is the appropriate technique for this research, its procedures generate hidden costs in a system, such as decision time, distant offloading, and network congestion. Many researchers attempt to reduce these costs to get the results of static offloading (in stable environments). However, this research seeks to overcome the hidden costs in the prevalent offloading techniques to balance the load in a fog environment by utilising the sustainability concept. This research believes that increasing physical resources is the only way to improve efficiency as a long-term solution. The study consists of two consecutive phases. The first phase attempts to find the optimum solution between task offloading and service placement. The solution must revive the low-cost offloading solution. A sustainable load-balancing monitoring system (SlbmS) represents the second phase of this research. It is the comprehensive solution for the optimum solution to release its limitations. SlbmS uses the sustainability concept to solve the problem of the limitation of resources in edge computing using reinforcement learning. The experiment results of the two phases show that hybrid offloading outperforms the service placement policy in the first stage and prevalent offloading in the second stage when utilising the behaviour of static offloading to reduce the offloading costs in unpredictable environments. The study aims to explore a new area of research that attempts to amend the network topology to improve resource provisioning to provide a free resource at the network's edge. This research paved the way for a new dimension of analysis. It is the first research to recommend the physical expansion in the fog layer using the sustainability concept.18 0Item Restricted Investigating the durability and sustainability of materials used in Accelerated Bridge Construction (ABC)(Saudi Digital Library, 2023-11-13) Alyami, Ali; Thomas, PaulAccelerated bridge construction (ABC) is one of the advanced engineering techniques that is gaining popularity worldwide, presenting advantageous benefits to the modern in terms of minimizing traffic disruption, increasing safety, reducing construction costs, and shortening construction duration. However, current concrete materials are falling behind in meeting the future expectations and demands for sustainability and durability advancement in bridge engineering. Ultra-high-performance concrete (UHPC) is one of the promising concrete materials that present outstanding performance due to its superior mechanical and durability properties that will address various issues in bridge engineering, providing longer serviceability and enhanced durability in severe weather conditions. The high initial costs and carbon dioxide (CO2) emissions associated with the implementation of UHPC at the early construction stages present some concerns leading to limiting the widespread adoption of this product. This paper investigates the potential of UHPC versus other concrete materials, highlighting their durability and sustainability performance to seek its viability as cost-effective and green material option. The long-life cycle cost and environmental assessments show that UHPC has the potential to be one of the most durable and sustainable concrete materials due to the decreased costs associated with reduced concrete volume, maintenance frequency and CO2 footprint emissions over a long-time range.13 0