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1 – 10 of over 2000Ahmed M. Attia, Ahmad O. Alatwi, Ahmad Al Hanbali and Omar G. Alsawafy
This research integrates maintenance planning and production scheduling from a green perspective to reduce the carbon footprint.
Abstract
Purpose
This research integrates maintenance planning and production scheduling from a green perspective to reduce the carbon footprint.
Design/methodology/approach
A mixed-integer nonlinear programming (MINLP) model is developed to study the relation between production makespan, energy consumption, maintenance actions and footprint, i.e. service level and sustainability measures. The speed scaling technique is used to control energy consumption, the capping policy is used to control CO2 footprint and preventive maintenance (PM) is used to keep the machine working in healthy conditions.
Findings
It was found that ignoring maintenance activities increases the schedule makespan by more than 21.80%, the total maintenance time required to keep the machine healthy by up to 75.33% and the CO2 footprint by 15%.
Research limitations/implications
The proposed optimization model can simultaneously be used for maintenance planning, job scheduling and footprint minimization. Furthermore, it can be extended to consider other maintenance activities and production configurations, e.g. flow shop or job shop scheduling.
Practical implications
Maintenance planning, production scheduling and greenhouse gas (GHG) emissions are intertwined in the industry. The proposed model enhances the performance of the maintenance and production systems. Furthermore, it shows the value of conducting maintenance activities on the machine's availability and CO2 footprint.
Originality/value
This work contributes to the literature by combining maintenance planning, single-machine scheduling and environmental aspects in an integrated MINLP model. In addition, the model considers several practical features, such as machine-aging rate, speed scaling technique to control emissions, minimal repair (MR) and PM.
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Juan Du, Yan Xue, Vijayan Sugumaran, Min Hu and Peng Dong
For prefabricated building construction, improper handling of the production scheduling for prefabricated components is one of the main reasons that affect project performance…
Abstract
Purpose
For prefabricated building construction, improper handling of the production scheduling for prefabricated components is one of the main reasons that affect project performance, which causes overspending, schedule overdue and quality issues. Prior research on prefabricated components production schedule has shown that optimizing the flow shop scheduling problem (FSSP) is the basis for solving this issue. However, some key resources and the behavior of the participants in the context of actual prefabricated components production are not considered comprehensively.
Design/methodology/approach
This paper characterizes the production scheduling of the prefabricated components problem into a permutation flow shop scheduling problem (PFSSP) with multi-optimization objectives, and limitation on mold and buffers size. The lean construction principles of value-based management (VBM) and just-in-time (JIT) are incorporated into the production process of precast components. Furthermore, this paper applies biogeography-based optimization (BBO) to the production scheduling problem of prefabricated components combined with some improvement measures.
Findings
This paper focuses on two specific scenarios: production planning and production rescheduling. In the production planning stage, based on the production factor, this study establishes a multi-constrained and multi-objective prefabricated component production scheduling mathematical model and uses the improved BBO for prefabricated component production scheduling. In the production rescheduling stage, the proposed model allows real-time production plan adjustments based on uncertain events. An actual case has been used to verify the effectiveness of the proposed model and the improved BBO.
Research limitations/implications
With respect to limitations, only linear weighted transformations are used for objective optimization. In regards to research implications, this paper considers the production of prefabricated components in an environment where all parties in the supply chain of prefabricated components participate to solve the production scheduling problem. In addition, this paper creatively applies the improved BBO to the production scheduling problem of prefabricated components. Compared to other algorithms, the results show that the improved BBO show optimized result.
Practical implications
The proposed approach helps prefabricated component manufacturers consider complex requirements which could be used to formulate a more scientific and reasonable production plan. The proposed plan could ensure the construction project schedule and balance the reasonable requirements of all parties. In addition, improving the ability of prefabricated component production enterprises to deal with uncertain events. According to actual production conditions (such as the occupation of mold resources and storage resources of completed components), prefabricated component manufacturers could adjust production plans to reduce the cost and improve the efficiency of the whole prefabricated construction project.
Originality/value
The value of this article is to provide details of the procedures and resource constraints from the perspective of the precast components supply chain, which is closer to the actual production process of prefabricated components. In addition, developing the production scheduling for lean production will be in line with the concept of sustainable development. The proposed lean production scheduling could establish relationships between prefabricated component factory manufacturers, transportation companies, on-site contractors and production workers to reduce the adverse effects of emergencies on the prefabricated component production process, and promote the smooth and efficient operation of construction projects.
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The purpose of this paper is to provide a commentary on Griffin et al.’s paper, “Positive family connections: Co-producing a virtual group programme for family carers of children…
Abstract
Purpose
The purpose of this paper is to provide a commentary on Griffin et al.’s paper, “Positive family connections: Co-producing a virtual group programme for family carers of children with learning disabilities or who are autistic”.
Design/methodology/approach
This is a commentary on co-production, drawing on Griffin et al.’s paper and the values base of the field.
Findings
Co-production is a valuable approach which seeks to empower and include key people in research. As suggested by Griffin et al., disseminating learning about co-production is an important additional principle of co-production, which demonstrates a values-based commitment to co-production.
Originality/value
This commentary is aimed at professionals and researchers working in the field of learning disabilities who are keen to learn about and do co-production.
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Shaoyu Zeng, Yinghui Wu and Yang Yu
The paper formulates a bi-objective mixed-integer nonlinear programming model, aimed at minimizing the total labor hours and the workload unfairness for the multi-skilled worker…
Abstract
Purpose
The paper formulates a bi-objective mixed-integer nonlinear programming model, aimed at minimizing the total labor hours and the workload unfairness for the multi-skilled worker assignment problem in Seru production system (SPS).
Design/methodology/approach
Three approaches, namely epsilon-constraint method, non-dominated sorting genetic algorithm 2 (NSGA-II) and improved strength Pareto evolutionary algorithm (SPEA2), are designed for solving the problem.
Findings
Numerous experiments are performed to assess the applicability of the proposed model and evaluate the performance of algorithms. The merged Pareto-fronts obtained from both NSGA-II and SPEA2 were proposed as final solutions to provide useful information for decision-makers.
Practical implications
SPS has the flexibility to respond to the changing demand for small amount production of multiple varieties products. Assigning cross-trained workers to obtain flexibility has emerged as a major concern for the implementation of SPS. Most enterprises focus solely on measures of production efficiency, such as minimizing the total throughput time. Solutions based on optimizing efficiency measures alone can be unacceptable by workers who have high proficiency levels when they are achieved at the expense of the workers taking more workload. Therefore, study the tradeoff between production efficiency and fairness in the multi-skilled worker assignment problem is very important for SPS.
Originality/value
The study investigates a new mixed-integer programming model to optimize worker-to-seru assignment, batch-to-seru assignment and task-to-worker assignment in SPS. In order to solve the proposed problem, three problem-specific solution approaches are proposed.
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This chapter has aimed to indicate some new important emerging policy problems, which have characterised the Covid crisis in the European economy during 2020 and then the…
Abstract
This chapter has aimed to indicate some new important emerging policy problems, which have characterised the Covid crisis in the European economy during 2020 and then the bounce-back in 2021. The chapter has illustrated an economic theoretical framework focussed on innovation and structural changes, according to a Schumpeterian and evolutionary or neo-institutional approach, which seems more appropriate than the traditional neoclassical and macroeconomic models, as the basis for a ‘new industrial strategy’ in the European Union. The mainstream economic models are static and point-like, as they do not consider the role of time and of space, such as the existence of asymmetric information and external economies and also the interdependence between the companies and the other ‘stakeholders’ in the process of economic development. On the contrary, the theoretical framework of this chapter considers the factors that act on the structural changes according to four different and interdependent dimensions: the final demand, the intermediate productions and also the supply of labour and the endowment of natural resources. Finally, some preliminary indications on the organisation of a new industrial strategy at the European scale are discussed, different from the focus on just the digital and green technologies, as indicated by the NGEU program by the European Commission.
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Hasan Tutar, Hakan Eryüzlü, Ahmet Tuncay Erdem and Teymur Sarkhanov
This study investigates the correlation between economic development and scientific knowledge production indicators in the BRICS countries from 2000 to 2020, highlighting the…
Abstract
Purpose
This study investigates the correlation between economic development and scientific knowledge production indicators in the BRICS countries from 2000 to 2020, highlighting the importance of human resources, natural resources, and innovation. Addressing a gap in the existing literature, this study aims to contribute significantly to understanding this relationship.
Design/methodology/approach
Employing a descriptive statistical approach, this study utilizes GDP and per capita income as economic indicators and scientific data from WoS and SCOPUS databases, focusing on scientific document production and citations per document.
Findings
The analysis reveals a strong correlation between economic development and scientific performance within the BRICS nations during the specified period. It emphasizes the interdependence of economic progress and scientific prowess, underscoring that they cannot be considered independently.
Research limitations/implications
However, limitations exist, notably the reliance on specific databases that might not cover the entire scientific output and the inability to capture all factors influencing economic and scientific development.
Originality/value
Understanding this interdependence has crucial originality. Policymakers and stakeholders in BRICS countries can leverage these insights to prioritize investments in human capital development and scientific research. This approach can foster sustainable economic growth by reducing reliance on natural resources.
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Gustavo Schiavo and Annibal Scavarda
This study aims to evaluate how corporate governance focused on meeting the legal requirements applied in poultry slaughterhouses contributes to the advancement of the Sustainable…
Abstract
Purpose
This study aims to evaluate how corporate governance focused on meeting the legal requirements applied in poultry slaughterhouses contributes to the advancement of the Sustainable Development Goals (SDGs) within the environmental pillar and identify vulnerabilities in this governance framework.
Design/methodology/approach
This research was qualitative and was structured with the following steps: literature review, selection of companies and documentary research on licenses applied to these companies.
Findings
The assessment demonstrates that the governance strategy based on legal aspects contributes to progress in indicators related to SDGs such as clean water, climate action, life below water and life on land. However, it falls short when addressing SDG 7 on affordable and clean energy. Another vulnerability of this governance model is that legislation establishes metrics and indicators individually for each link in the poultry industry chain.
Research limitations/implications
Assessment of the corporate governance of poultry slaughterhouses, focusing on legality and analyzing vulnerabilities in the legal aspects of the poultry industry concerning the SDGs that encompass the environmental pillar.
Practical implications
The results provide valuable information for policymakers, regulators and industry stakeholders in the segment, suggesting the need to align legislation with SDGs or adopt incentive policies to encourage the spontaneous advancement of SDGs in the poultry industry.
Originality/value
Considering the need for progress toward a more sustainable world and the trend of organizations focusing their efforts on complying with local legislation, this study aims to contribute to understanding how the legal requirements applied in practice are prepared to support the advancement of the SDGs.
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Meryem Melis Cihan Yavuzcan and Elmira Ayşe Gür
This study aims to draw a general framework for recreating water-related urban places. It discusses design criteria and processes that will strengthen people's and the city's…
Abstract
Purpose
This study aims to draw a general framework for recreating water-related urban places. It discusses design criteria and processes that will strengthen people's and the city's relationship with the waterfront. It also explores the functional requirements of a participatory process to incorporate social and functional relations into place making.
Design/methodology/approach
The study is based on a comprehensive case study of the Kabataş project process. Data collection methods include archive searches, questionnaires, interviews and analysis. The study analyses the architectural decisions, the role and perspectives of the key actors and the current dynamics that shape the process. It points out shortcomings and needs of communication and collaboration with different stakeholders, especially with the users.
Findings
The results show that political and power dynamics play an important role in shaping the process. Non-transparent processes increase the gap between the aspects of community and decision makers in current practices. Establishing holistic, waterfront-specific and collaborative approaches is a necessity. The results also show that the success of participation depends on procedural dynamics such as scope, method, timing, representativeness of the community, institutionalisation level, transparency and deliberation.
Originality/value
Despite the intense interest in waterfront regeneration, few studies have focused on the potential of the participatory process. The study examines the intersections of waterfront design decisions and collaborative participation at various scales and emphasises the importance of local actors in the social production of space.
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Giovanni Semi and Annalisa Frisina
The purpose of this chapter is twofold: in the first part, we will provide comprehensive, state-of-the-art urban and visual studies across the domains of visibility, urban…
Abstract
The purpose of this chapter is twofold: in the first part, we will provide comprehensive, state-of-the-art urban and visual studies across the domains of visibility, urban aesthetics and the legitimate use of the urban. We will show that what we see is foremost what is accessible and legitimate as a vision, while the urban provides multiple realms of invisibility that are often neglected or rendered invisible. Art, architecture, urbanism and place-making will be used as examples of these dynamics.
In the second part of the chapter, we will present a research study on the decolonial practices of re-signification of colonial urban traces. Despite the dominant representation of Italians as ‘good people’ (a local version of ‘white innocence’), in recent years, Italy has witnessed a new interest stemming from bottom-up local movements dealing with colonial legacy in the urban space. We will show a research example (‘Decolonising the City. Visual Dialogues in Padova’) based on participatory video, arts-based methods and walking methods.
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