Pub Date : 2025-12-01DOI: 10.1016/j.jer.2025.02.006
Olfa Zghal , Ahmed Ketata , Hasna Abid , Slim Zouari , Giovanni Gugliuzza , Maroua Mejri , Emilia Arrabito , Saiid Taktak , Zied Driss
This paper examines the climate conditions of a soilless greenhouse using numerical modeling and experimental setups. The objective is to predict the impacts of design parameters on the microclimate, focusing on adjusting the roof height of the soilless tunnel greenhouse in Tunisia. Numerical simulations using the ANSYS FLUENT 16.2 software were employed to account for the dynamic impacts of current tomato and basil crops on airflow and heat exchanges. An experimental study on a prototype soilless greenhouse in Tunis-Manouba validated the proposed Computational Fluid Dynamics model. This research also investigates how changes in greenhouse height affect the flow characteristics and energy dynamics, recommending optimal climate conditions for soilless agriculture. Developed correlations express the average air temperature and air velocity inside the greenhouse as functions of the height and the ambient temperature. Additionally, reducing the greenhouse height by about 35 % can increase the average temperature inside the greenhouse by 2 K. These findings provide valuable insights for designing efficient greenhouses, improving energy management, and optimizing crop yields. The study also establishes relationships between temperature, Vapor Pressure Deficit, meteorological conditions, and roof height, contributing to sustainable agriculture practices and climate-resilient farming.
{"title":"Numerical investigation of CFD parameters: Evaluating height variations on microclimate and crop performance in large-scale soilless greenhouses in northern Tunisia","authors":"Olfa Zghal , Ahmed Ketata , Hasna Abid , Slim Zouari , Giovanni Gugliuzza , Maroua Mejri , Emilia Arrabito , Saiid Taktak , Zied Driss","doi":"10.1016/j.jer.2025.02.006","DOIUrl":"10.1016/j.jer.2025.02.006","url":null,"abstract":"<div><div>This paper examines the climate conditions of a soilless greenhouse using numerical modeling and experimental setups. The objective is to predict the impacts of design parameters on the microclimate, focusing on adjusting the roof height of the soilless tunnel greenhouse in Tunisia. Numerical simulations using the ANSYS FLUENT 16.2 software were employed to account for the dynamic impacts of current tomato and basil crops on airflow and heat exchanges. An experimental study on a prototype soilless greenhouse in Tunis-Manouba validated the proposed Computational Fluid Dynamics model. This research also investigates how changes in greenhouse height affect the flow characteristics and energy dynamics, recommending optimal climate conditions for soilless agriculture. Developed correlations express the average air temperature and air velocity inside the greenhouse as functions of the height and the ambient temperature. Additionally, reducing the greenhouse height by about 35 % can increase the average temperature inside the greenhouse by 2 K. These findings provide valuable insights for designing efficient greenhouses, improving energy management, and optimizing crop yields. The study also establishes relationships between temperature, Vapor Pressure Deficit, meteorological conditions, and roof height, contributing to sustainable agriculture practices and climate-resilient farming.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3871-3884"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2024.10.007
Dalal I. Almesri, Nawaf K. Alotaibi
Concrete production significantly contributes to carbon emissions and depletes natural resources, promoting increased interest in substituting traditional materials with recycled alternatives. This shift necessitates a thorough examination of recycled materials’ performance in concrete applications. This study aims to provide a better understanding of the shear transfer behavior of concrete containing reclaimed asphalt pavement (RAP) aggregates. To mitigate the potential negative impact of RAP aggregates, mechanical treatment was applied. The effects of RAP inclusion and mechanical treatment on the shear transfer strength of reinforced concrete were investigated. A total of twenty-four push-off specimens were tested to investigate the effects of aggregate replacement and the clamping reinforcement ratio on specimen behavior. Digital image correlation (DIC) was employed to monitor the strains and displacements, allowing for detailed tracking of the interface slip, crack width development, and reinforcement strain. The findings revealed that replacing natural aggregates with RAP aggregates resulted in lower compressive strengths and lower ultimate push-off strengths of the resulting concrete at equivalent effective water-to-cement (w/c) ratios. Specimens with higher reinforcement ratios retained residual strengths up to 77 % of the ultimate strength, even at relatively large slip and crack widths. The clamping reinforcement ratio was identified as the key factor influencing the ultimate and residual strengths for both types of concrete. The experimental results were compared to the strengths calculated by the ACI, PCI, AASHTO, and CSA design equations to evaluate their applicability when different aggregate types are used.
{"title":"Evaluation of the interface shear strength of concrete containing treated and untreated reclaimed asphalt pavement aggregates","authors":"Dalal I. Almesri, Nawaf K. Alotaibi","doi":"10.1016/j.jer.2024.10.007","DOIUrl":"10.1016/j.jer.2024.10.007","url":null,"abstract":"<div><div>Concrete production significantly contributes to carbon emissions and depletes natural resources, promoting increased interest in substituting traditional materials with recycled alternatives. This shift necessitates a thorough examination of recycled materials’ performance in concrete applications. This study aims to provide a better understanding of the shear transfer behavior of concrete containing reclaimed asphalt pavement (RAP) aggregates. To mitigate the potential negative impact of RAP aggregates, mechanical treatment was applied. The effects of RAP inclusion and mechanical treatment on the shear transfer strength of reinforced concrete were investigated. A total of twenty-four push-off specimens were tested to investigate the effects of aggregate replacement and the clamping reinforcement ratio on specimen behavior. Digital image correlation (DIC) was employed to monitor the strains and displacements, allowing for detailed tracking of the interface slip, crack width development, and reinforcement strain. The findings revealed that replacing natural aggregates with RAP aggregates resulted in lower compressive strengths and lower ultimate push-off strengths of the resulting concrete at equivalent effective water-to-cement (w/c) ratios. Specimens with higher reinforcement ratios retained residual strengths up to 77 % of the ultimate strength, even at relatively large slip and crack widths. The clamping reinforcement ratio was identified as the key factor influencing the ultimate and residual strengths for both types of concrete. The experimental results were compared to the strengths calculated by the ACI, PCI, AASHTO, and CSA design equations to evaluate their applicability when different aggregate types are used.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 2922-2939"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2024.12.009
Abdelmalek Gacem , Ridha Kechida , Youcef Bekakra , Francisco Jurado , Mariam A. Sameh
Photovoltaic (PV) power plants have recently attracted the attention of researchers and power system developers. One of the challenges of PV systems is ensuring an accurate mathematical model of the PV module. Accurate modeling of the behavior of these modules is indispensable for reliable system evaluation, analysis, design, development, and optimization of the performance and efficiency of photovoltaic systems. This paper presents the optimal estimation of the parameters of a mathematical model for a PV cell and module. Moreover, a new hybrid cuckoo search-gorilla troop optimization CS-GTO algorithm is proposed. The performance of the proposed hybrid CS-GTO algorithm is tested and evaluated on standard 23 benchmark functions and several data sets of commercial PV cells and modules. The obtained results were compared with other optimization algorithms mentioned in the literature, the comparative study conclusively demonstrates that the hybrid CS-GTO algorithm consistently outperforms other methods in terms of accuracy and convergence speed towards the global optimal solution, making it a robust tool for a wide range of optimization problems.
{"title":"Hybrid cuckoo search-gorilla troops optimizer for optimal parameter estimation in photovoltaic modules","authors":"Abdelmalek Gacem , Ridha Kechida , Youcef Bekakra , Francisco Jurado , Mariam A. Sameh","doi":"10.1016/j.jer.2024.12.009","DOIUrl":"10.1016/j.jer.2024.12.009","url":null,"abstract":"<div><div>Photovoltaic (PV) power plants have recently attracted the attention of researchers and power system developers. One of the challenges of PV systems is ensuring an accurate mathematical model of the PV module. Accurate modeling of the behavior of these modules is indispensable for reliable system evaluation, analysis, design, development, and optimization of the performance and efficiency of photovoltaic systems. This paper presents the optimal estimation of the parameters of a mathematical model for a PV cell and module. Moreover, a new hybrid cuckoo search-gorilla troop optimization CS-GTO algorithm is proposed. The performance of the proposed hybrid CS-GTO algorithm is tested and evaluated on standard 23 benchmark functions and several data sets of commercial PV cells and modules. The obtained results were compared with other optimization algorithms mentioned in the literature, the comparative study conclusively demonstrates that the hybrid CS-GTO algorithm consistently outperforms other methods in terms of accuracy and convergence speed towards the global optimal solution, making it a robust tool for a wide range of optimization problems.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3334-3351"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2025.01.010
Lotfi Hidri
This paper addresses the challenge of incorporating removal times in multi-stage flexible flow shops. The problem exhibits symmetry, meaning the sequencing process remains the same whether we start from the first stage and proceed to the last, or work in reverse. This symmetry allows for a comprehensive investigation of both the original and reverse problems, leading to more robust and high-quality solutions. From a practical perspective, this problem models several real-world manufacturing systems where removal times significantly impact production schedules. Theoretically, this scheduling problem is particularly complex due to its strong NP-hard nature, posing a significant challenge for optimization. To tackle this, we propose an efficient two-phase optimization heuristic, designed to provide near-optimal solutions. In this heuristic, parallel machine scheduling with release dates, removal times, and delivery dates is applied iteratively at each stage of the process. Additionally, new lower bounds are developed to assess the quality of the proposed heuristic. These lower bounds are critical for measuring the relative gap between the heuristic and the optimal solution. In the first type of lower bound, all stages except one are relaxed in terms of capacity. The second is using the polynomial parallel machine problem to estimate the minimum idle time at subsequent stages. Extensive experimental testing on benchmark problems confirms the effectiveness of the proposed methods, demonstrating their suitability for both practical and theoretical scheduling challenges. The results show an average relative gap of 1.05 %.
{"title":"Flexible flow shop scheduling problem with removal times","authors":"Lotfi Hidri","doi":"10.1016/j.jer.2025.01.010","DOIUrl":"10.1016/j.jer.2025.01.010","url":null,"abstract":"<div><div>This paper addresses the challenge of incorporating removal times in multi-stage flexible flow shops. The problem exhibits symmetry, meaning the sequencing process remains the same whether we start from the first stage and proceed to the last, or work in reverse. This symmetry allows for a comprehensive investigation of both the original and reverse problems, leading to more robust and high-quality solutions. From a practical perspective, this problem models several real-world manufacturing systems where removal times significantly impact production schedules. Theoretically, this scheduling problem is particularly complex due to its strong NP-hard nature, posing a significant challenge for optimization. To tackle this, we propose an efficient two-phase optimization heuristic, designed to provide near-optimal solutions. In this heuristic, parallel machine scheduling with release dates, removal times, and delivery dates is applied iteratively at each stage of the process. Additionally, new lower bounds are developed to assess the quality of the proposed heuristic. These lower bounds are critical for measuring the relative gap between the heuristic and the optimal solution. In the first type of lower bound, all stages except one are relaxed in terms of capacity. The second is using the polynomial parallel machine problem to estimate the minimum idle time at subsequent stages. Extensive experimental testing on benchmark problems confirms the effectiveness of the proposed methods, demonstrating their suitability for both practical and theoretical scheduling challenges. The results show an average relative gap of 1.05 %.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3506-3517"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2025.03.009
Hafiza Habiba Shabbir , Muhammad Hamza Farooq , Amna Zafar , Beenish Ayesha Akram , Talha Waheed , Muhammad Aslam
A Very common problem of employee attrition that requires precise and fast predictive models in modern business settings. We proposed a novel time-to-event Weibull Time-to-Event Recurrent Neural Network forecasting model in this study. This is cross-verified and validated by conducting an in-depth comparative study regarding the performance of the proposed Weibull Time to Event Recurrent Neural Network model against traditional models used in machine learning. This involved the comparison of a number of the classical models on their ability and performance, noting the strengths and weaknesses of the Weibull Time to Event Recurrent Neural Network improvements realized with long-range dependencies. Application of the HR dataset had shown that, while using the Weibull Time to Event Recurrent Neural Network model, the prediction worked out well as compared to other models. Our model R-squared value is 0.98, with very minimal Mean Squared Error (MSE) of 0.0032. This model makes it easier for human resource (HR) professionals and decision-makers to understand the predictions that it makes, enabling them to develop recruitment and retention strategies better adjusted to the needs of given employees.
{"title":"Enhancing employee churn prediction with weibull time-to-event modeling","authors":"Hafiza Habiba Shabbir , Muhammad Hamza Farooq , Amna Zafar , Beenish Ayesha Akram , Talha Waheed , Muhammad Aslam","doi":"10.1016/j.jer.2025.03.009","DOIUrl":"10.1016/j.jer.2025.03.009","url":null,"abstract":"<div><div>A Very common problem of employee attrition that requires precise and fast predictive models in modern business settings. We proposed a novel time-to-event Weibull Time-to-Event Recurrent Neural Network forecasting model in this study. This is cross-verified and validated by conducting an in-depth comparative study regarding the performance of the proposed Weibull Time to Event Recurrent Neural Network model against traditional models used in machine learning. This involved the comparison of a number of the classical models on their ability and performance, noting the strengths and weaknesses of the Weibull Time to Event Recurrent Neural Network improvements realized with long-range dependencies. Application of the HR dataset had shown that, while using the Weibull Time to Event Recurrent Neural Network model, the prediction worked out well as compared to other models. Our model R-squared value is 0.98, with very minimal Mean Squared Error (MSE) of 0.0032. This model makes it easier for human resource (HR) professionals and decision-makers to understand the predictions that it makes, enabling them to develop recruitment and retention strategies better adjusted to the needs of given employees.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3231-3248"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To improve energy harvesting from road surfaces prone to instability and fatigue, this study presents an innovative design that integrates shape memory alloys (SMAs) with piezoelectric materials. Piezoelectric materials convert mechanical vibrations from vehicular motion into electrical energy, but their efficiency is often reduced by irregular pressure fluctuations. In contrast, SMAs possess reversible deformation properties that adapt to stress and temperature changes, making them suitable for stabilizing vibrations and enhancing energy capture. Additionally, SMAs can act as indirect dynamic energy generators through vibration feedback. Therefore, this study presents an innovative design that combines SMAs and piezoelectric materials for energy harvesting on road surfaces. The main objective is to enhance energy production by stabilizing vibrations and increasing the lifespan of the harvesting system. The methodology involves modeling the SMA-piezoelectric system integration and conducting numerical simulations to validate its effectiveness. Findings demonstrate that this hybrid system increases electricity production by 36 % and extends system lifespan by 67 % by mitigating stress fluctuations. Thus, the present work demonstrates promising potential by building on previous literature. It introduces a novel hybrid SMA-piezoelectric system that stabilizes stress, enhances energy conversion efficiency, and extends lifespan, effectively addressing conventional design limitations. Key challenges include the high cost of SMAs and the need for extensive testing under varied conditions. Hence, upcoming study will focus on optimizing cost-effectiveness, exploring alternative materials, assessing long-term performance, and validating simulations through field tests. Additionally, efficient material combinations, long-term durability, and design optimization will be explored.
{"title":"Improving energy harvesting by integrating smart materials into road infrastructure","authors":"Mouna Ben Zohra , Amine Riad , Essaadia Azelmad , Abdelilah Alhamany","doi":"10.1016/j.jer.2025.01.003","DOIUrl":"10.1016/j.jer.2025.01.003","url":null,"abstract":"<div><div>To improve energy harvesting from road surfaces prone to instability and fatigue, this study presents an innovative design that integrates shape memory alloys (SMAs) with piezoelectric materials. Piezoelectric materials convert mechanical vibrations from vehicular motion into electrical energy, but their efficiency is often reduced by irregular pressure fluctuations. In contrast, SMAs possess reversible deformation properties that adapt to stress and temperature changes, making them suitable for stabilizing vibrations and enhancing energy capture. Additionally, SMAs can act as indirect dynamic energy generators through vibration feedback. Therefore, this study presents an innovative design that combines SMAs and piezoelectric materials for energy harvesting on road surfaces. The main objective is to enhance energy production by stabilizing vibrations and increasing the lifespan of the harvesting system. The methodology involves modeling the SMA-piezoelectric system integration and conducting numerical simulations to validate its effectiveness. Findings demonstrate that this hybrid system increases electricity production by 36 % and extends system lifespan by 67 % by mitigating stress fluctuations. Thus, the present work demonstrates promising potential by building on previous literature. It introduces a novel hybrid SMA-piezoelectric system that stabilizes stress, enhances energy conversion efficiency, and extends lifespan, effectively addressing conventional design limitations. Key challenges include the high cost of SMAs and the need for extensive testing under varied conditions. Hence, upcoming study will focus on optimizing cost-effectiveness, exploring alternative materials, assessing long-term performance, and validating simulations through field tests. Additionally, efficient material combinations, long-term durability, and design optimization will be explored.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3833-3843"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2025.02.009
Somia Taba, Mohamed Amine Benchana, Salah Redadaa, Samir Ikni
The ordinary partial transmission sequence (OPTS) technique is known as an inherent and accurate peak-to-average power ratio (PAPR) reduction scheme in orthogonal frequency division multiplexing (OFDM). However, it suffers from a major drawback, an exponentially increasing complexity, mainly caused by the exhaustive search for the ideal set of phase factors that effectively reduces PAPR. This work proposes a new PTS scheme based on an improved whale optimization algorithm (IWOA) to search for an appropriate combination of phase factors that mitigates PAPR with much lower complexity. The particular hunting behavior of humpback whales is mimicked, and its mathematical model is used in the PTS technique. The modified mutualism phase in the algorithm balances its exploration-exploitation capabilities, ensuring convergence to the best global solution and avoiding less efficient solutions. The simulation results confirm the superiority of IWOA-PTS in terms of computational load and PAPR reduction
{"title":"IWOA-PTS: An improved whale optimization algorithm-based PTS technique for PAPR reduction in OFDM systems","authors":"Somia Taba, Mohamed Amine Benchana, Salah Redadaa, Samir Ikni","doi":"10.1016/j.jer.2025.02.009","DOIUrl":"10.1016/j.jer.2025.02.009","url":null,"abstract":"<div><div>The ordinary partial transmission sequence (OPTS) technique is known as an inherent and accurate peak-to-average power ratio (PAPR) reduction scheme in orthogonal frequency division multiplexing (OFDM). However, it suffers from a major drawback, an exponentially increasing complexity, mainly caused by the exhaustive search for the ideal set of phase factors that effectively reduces PAPR. This work proposes a new PTS scheme based on an improved whale optimization algorithm (IWOA) to search for an appropriate combination of phase factors that mitigates PAPR with much lower complexity. The particular hunting behavior of humpback whales is mimicked, and its mathematical model is used in the PTS technique. The modified mutualism phase in the algorithm balances its exploration-exploitation capabilities, ensuring convergence to the best global solution and avoiding less efficient solutions. The simulation results confirm the superiority of IWOA-PTS in terms of computational load and PAPR reduction</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3418-3428"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2024.11.008
Mey Al Leem , Khalil Abdelrazek Khalil , Alaa M. Ubaid
This research aims to propose a framework for applying ambidexterity in the UAE’s public sector project-based organization. The study uses a quantitative research methodology to survey 400 public sector employees to establish the correlation between organizational culture, leadership, technology, and ambidexterity. The study validates these factors' importance to ambidexterity using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). The study reveals that a supportive organizational culture and transformational leadership positively influence ambidextrous capabilities, while technology adoption moderates the impact of leadership and culture on ambidexterity. Furthermore, the findings reinforce the hypotheses that human capital and employee flexibility facilitate ambidextrous strategies, mainly when supported by technology. However, the study identifies factors like organizational silos, resistance to change, and resource scarcity, which are the main barriers to ambidexterity. Therefore, the study contributes to the literature by proposing a context-specific framework for ambidexterity in the UAE’s public sector. It offers valuable insights to policymakers and public sector managers about overcoming the challenges inherent in the ambidexterity process. The validated framework provides tangible guidelines for building ambidexterity, especially regarding technology resources, organizational culture, and leadership.
{"title":"Strategic and technological drivers of ambidexterity and sustainability: Impact assessment in UAE project-based public sector organizations","authors":"Mey Al Leem , Khalil Abdelrazek Khalil , Alaa M. Ubaid","doi":"10.1016/j.jer.2024.11.008","DOIUrl":"10.1016/j.jer.2024.11.008","url":null,"abstract":"<div><div>This research aims to propose a framework for applying ambidexterity in the UAE’s public sector project-based organization. The study uses a quantitative research methodology to survey 400 public sector employees to establish the correlation between organizational culture, leadership, technology, and ambidexterity. The study validates these factors' importance to ambidexterity using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). The study reveals that a supportive organizational culture and transformational leadership positively influence ambidextrous capabilities, while technology adoption moderates the impact of leadership and culture on ambidexterity. Furthermore, the findings reinforce the hypotheses that human capital and employee flexibility facilitate ambidextrous strategies, mainly when supported by technology. However, the study identifies factors like organizational silos, resistance to change, and resource scarcity, which are the main barriers to ambidexterity. Therefore, the study contributes to the literature by proposing a context-specific framework for ambidexterity in the UAE’s public sector. It offers valuable insights to policymakers and public sector managers about overcoming the challenges inherent in the ambidexterity process. The validated framework provides tangible guidelines for building ambidexterity, especially regarding technology resources, organizational culture, and leadership.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3473-3486"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2025.03.008
Mojtaba Aghaei , Maghsoud Amiri , Mani Sharifi , Seyyed Jalaladdin Hosseini Dehshiri , Mohammad Taghi Taghavifard
Buffer allocation and redundancy allocation problems arose during the design of the production line. This study investigated these two problems as an integer nonlinear multi-objective model. The purposes of the model included maximizing availability and minimizing overall system costs and buffer capacity. Machine failures were divided into preventive and emergency categories, and their costs were factored into the cost goal function. Furthermore, each machine's failures were considered accidental and followed Weibull distribution functions. To solve the problem, a method combining the design of experiments, simulation, neural network, and meta-heuristic algorithm was applied. The system was simulated using the results of designed experiments, and the results in neural networks were analyzed to estimate the functions related to cost and availability purposes. Finally, the neural network's estimated functions, another objective function (buffer capacity), and the problem's constraints were implemented in the meta-heuristic non-dominated sorting genetic algorithm III (NSGA-III) to obtain Pareto sets. The results were compared to the non-dominated sorting genetic algorithm II (NSGA-II) and the Multi-objective particle swarm optimization algorithm (MOPSO). The applicability of the proposed approach was demonstrated using a real case, and the outcomes validated the algorithm's effectiveness.
{"title":"Redundancy allocation and optimal buffer size determination in series-parallel production systems: A hybrid approach","authors":"Mojtaba Aghaei , Maghsoud Amiri , Mani Sharifi , Seyyed Jalaladdin Hosseini Dehshiri , Mohammad Taghi Taghavifard","doi":"10.1016/j.jer.2025.03.008","DOIUrl":"10.1016/j.jer.2025.03.008","url":null,"abstract":"<div><div>Buffer allocation and redundancy allocation problems arose during the design of the production line. This study investigated these two problems as an integer nonlinear multi-objective model. The purposes of the model included maximizing availability and minimizing overall system costs and buffer capacity. Machine failures were divided into preventive and emergency categories, and their costs were factored into the cost goal function. Furthermore, each machine's failures were considered accidental and followed Weibull distribution functions. To solve the problem, a method combining the design of experiments, simulation, neural network, and meta-heuristic algorithm was applied. The system was simulated using the results of designed experiments, and the results in neural networks were analyzed to estimate the functions related to cost and availability purposes. Finally, the neural network's estimated functions, another objective function (buffer capacity), and the problem's constraints were implemented in the meta-heuristic non-dominated sorting genetic algorithm III (NSGA-III) to obtain Pareto sets. The results were compared to the non-dominated sorting genetic algorithm II (NSGA-II) and the Multi-objective particle swarm optimization algorithm (MOPSO). The applicability of the proposed approach was demonstrated using a real case, and the outcomes validated the algorithm's effectiveness.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3568-3584"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.jer.2024.09.014
Guanting Li , Tzu-Chia Chen
The main objective of this research is to introduce three energy risk management models grounded in optimization techniques for the strategic placement of wind turbines, considering wake effects and uncertainties in wind speed and direction. For this purpose, wind speed and direction data are gathered, and Monte Carlo simulation is employed to model the uncertainties. Subsequently, the risk management models undergo optimization using Non-Dominated Sorting Genetic Algorithm II (NSGA-II), Pareto envelope-based selection algorithm II (PESA-II), and Multi-Objective Particle Swarm Optimization (MOPSO) algorithms. Findings reveal that the wind farm's maximum power output reaches approximately 5.8 megawatts across all three algorithms and optimal turbine placements. A risk assessment was conducted using a tenth percentile criterion, revealing a significant production risk within the study area, with production falling below 1.8 megawatts in 90 % of cases. Regarding the performance evaluation of the algorithms across all three models, superior performance in terms of solution proximity to the ideal solution is exhibited by PESA-II, while enhanced diversity and solution spread compared to the other algorithms are demonstrated by NSGA-II.
{"title":"Multi-objective mathematical model for optimal wind turbine placement in wind farm under uncertainty","authors":"Guanting Li , Tzu-Chia Chen","doi":"10.1016/j.jer.2024.09.014","DOIUrl":"10.1016/j.jer.2024.09.014","url":null,"abstract":"<div><div>The main objective of this research is to introduce three energy risk management models grounded in optimization techniques for the strategic placement of wind turbines, considering wake effects and uncertainties in wind speed and direction. For this purpose, wind speed and direction data are gathered, and Monte Carlo simulation is employed to model the uncertainties. Subsequently, the risk management models undergo optimization using Non-Dominated Sorting Genetic Algorithm II (NSGA-II), Pareto envelope-based selection algorithm II (PESA-II), and Multi-Objective Particle Swarm Optimization (MOPSO) algorithms. Findings reveal that the wind farm's maximum power output reaches approximately 5.8 megawatts across all three algorithms and optimal turbine placements. A risk assessment was conducted using a tenth percentile criterion, revealing a significant production risk within the study area, with production falling below 1.8 megawatts in 90 % of cases. Regarding the performance evaluation of the algorithms across all three models, superior performance in terms of solution proximity to the ideal solution is exhibited by PESA-II, while enhanced diversity and solution spread compared to the other algorithms are demonstrated by NSGA-II.</div></div>","PeriodicalId":48803,"journal":{"name":"Journal of Engineering Research","volume":"13 4","pages":"Pages 3249-3259"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}