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Ahmed Karam
Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo 11629, Egypt

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Journal article
Published: 02 August 2021 in Sustainability
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One of the solutions to improve the eco-efficiency of road freight transport is to combine existing transport modules into Longer and/or Heavier Vehicles (LHVs). The scientific and industrial communities have paid increasing attention to an LHV, known as the A-double combination, consisting of a tractor, two 13.5-m semitrailers, and a dolly converter. The present research contributes to the existing literature by developing a methodology based on a cost-benefit approach to quantify the effects of the A-double combinations if introduced to a line-haul transport system. Four implementation scenarios and sensitivity analyses of main variables were evaluated within a case study of 48,472 line-haul trips in Denmark. The results indicate that in the least beneficial scenario, the A-double combinations reduce transport cost by 9.65% while reducing trips, CO2 emissions, and road wear by 17.91%, 5.34%, and 9.55%, respectively. Besides, the use of A-double combinations can significantly reduce empty tractor-semitrailer trips. However, the benefits are relatively less in the case of just-in-time deliveries and cargo constrained by vehicle weight. Also, cost saving is highly sensitive to driver salaries, fuel prices, and driving speeds. This research provides valuable insights into the potentials of A-double combinations under different regulations and freight characteristics from a micro perspective.

ACS Style

Ahmed Karam; Kristian Reinau. Evaluating the Effects of the A-Double Vehicle Combinations If Introduced to a Line-Haul Freight Transport Network. Sustainability 2021, 13, 8622 .

AMA Style

Ahmed Karam, Kristian Reinau. Evaluating the Effects of the A-Double Vehicle Combinations If Introduced to a Line-Haul Freight Transport Network. Sustainability. 2021; 13 (15):8622.

Chicago/Turabian Style

Ahmed Karam; Kristian Reinau. 2021. "Evaluating the Effects of the A-Double Vehicle Combinations If Introduced to a Line-Haul Freight Transport Network." Sustainability 13, no. 15: 8622.

Review
Published: 16 May 2021 in Journal of Cleaner Production
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Off-site construction (OSC) is an innovative and sustainable construction method. One of its critical success factors is the proper management of its supply chain (SC). Recently, significant research attention has been focused on the modelling of OSC-SC to improve its performance and sustainability. However, the literature still lacks a comprehensive review of the modelling studies on off-site construction -supply chain management (OSC-SCM). Therefore, this research contributes by providing a comprehensive and up-to-date mapping and clustering of 309 journal articles on the modelling of OSC-SC to identify its trends and gaps, and hence, highlight future research opportunities. To achieve these objectives, a mixed review method, consisting of scientometric and systematic reviews, is used. The scientometric review identifies the most prolific journals, researchers, co-occurrence network of keywords, and their citation bursts. On the other hand, the systematic review classifies the articles based on OSC type and supply chain (SC) stage. At each SC stage, the articles are further classified based on problem settings and solution methods. The results show that production problems have received the most attention (i.e., by 28% of the included articles), followed by on-site construction (19%), design (13%), and logistics (7%) problems. However, researchers are more inclined to address problems at multiple SC stages (33%) due to the interrelationship between these stages. Besides, the systematic analysis shows that OSC-SC problems have been solved frequently by a variety of solution methods such as optimization (25%), simulation (13%) and building information modelling (BIM) (9.5%). However, researchers tend more to integrate multiple solution methods (35%) to address the complexities of OSC-SC problems. Finally, the included studies are classified based on the three sustainability dimensions. The results show that economic, environmental, and social sustainability dimensions have been considered in previous studies by 72%, 24%, and 4%, respectively. Therefore, the study identifies research gaps at each SC stage of each OSC type to incentivize future studies to consider more environmental and social sustainability factors in OSC-SC models. Since modular integrated construction (MiC) has the highest prefabrication level, this study provides future research directions for sustainable supply chain management (SCM) in MiC. The present research is an important reference guide that helps researchers and practitioners to understand different problem settings and their solution methods in OSC-SCM.

ACS Style

Mohamed Hussein; Abdelrahman E.E. Eltoukhy; Ahmed Karam; Ibrahim A. Shaban; Tarek Zayed. Modelling in off-site construction supply chain management: A review and future directions for sustainable modular integrated construction. Journal of Cleaner Production 2021, 310, 127503 .

AMA Style

Mohamed Hussein, Abdelrahman E.E. Eltoukhy, Ahmed Karam, Ibrahim A. Shaban, Tarek Zayed. Modelling in off-site construction supply chain management: A review and future directions for sustainable modular integrated construction. Journal of Cleaner Production. 2021; 310 ():127503.

Chicago/Turabian Style

Mohamed Hussein; Abdelrahman E.E. Eltoukhy; Ahmed Karam; Ibrahim A. Shaban; Tarek Zayed. 2021. "Modelling in off-site construction supply chain management: A review and future directions for sustainable modular integrated construction." Journal of Cleaner Production 310, no. : 127503.

Journal article
Published: 14 October 2020 in ISPRS International Journal of Geo-Information
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To make the right decisions on investments, operations, and policies in the public road sector, decision makers need knowledge about traffic measures of trucks, such as average travel time and the frequency of trips among geographical zones. Private logistics companies daily collect a large amount of freight global positioning system (GPS) and shipment data. Processing such data can provide public decision makers with detailed freight traffic measures, which are necessary for making different planning decisions. The present paper proposes a system framework to be used in the research project “A new system for sharing data between logistics companies and public infrastructure authorities: improving infrastructure while maintaining competitive advantage”. Previous studies ignored the fact that the primary step for delivering valuable and usable data processing systems is to consider the final user’s needs when developing the system framework. Unlike existing studies, this paper develops the system framework through applying a user-centred design approach combining three main steps. The first step is to identify the specific traffic measures that satisfy the public decision makers’ planning needs. The second step aims to identify the different types of freight data required as inputs to the data processing system, while the third step illustrates the procedures needed to process the shared freight data. To do so, the current work employs methods of literature review and users’ need identification in applying a user-centralized approach. In addition, we develop a systematic assessment of the coverage and sufficiency of the currently acquired data. Finally, we illustrate the detailed functionality of the data processing system and provide an application case to illustrate its procedures.

ACS Style

Ahmed Karam; Thorbjørn M. Illemann; Kristian Hegner Reinau; Goran Vuk; Christian O. Hansen. Towards Deriving Freight Traffic Measures from Truck Movement Data for State Road Planning: A Proposed System Framework. ISPRS International Journal of Geo-Information 2020, 9, 606 .

AMA Style

Ahmed Karam, Thorbjørn M. Illemann, Kristian Hegner Reinau, Goran Vuk, Christian O. Hansen. Towards Deriving Freight Traffic Measures from Truck Movement Data for State Road Planning: A Proposed System Framework. ISPRS International Journal of Geo-Information. 2020; 9 (10):606.

Chicago/Turabian Style

Ahmed Karam; Thorbjørn M. Illemann; Kristian Hegner Reinau; Goran Vuk; Christian O. Hansen. 2020. "Towards Deriving Freight Traffic Measures from Truck Movement Data for State Road Planning: A Proposed System Framework." ISPRS International Journal of Geo-Information 9, no. 10: 606.

Conference paper
Published: 10 July 2020 in LISS2019
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Despite the negative consequences on society and environment, urban freight transport is critical for the prosperity of cities. Decision makers have considered the horizontal collaboration between carriers as a solution to reduce the total transportation cost and the related negative impacts. In literature, the collaborative freight delivery is modelled as a Multi-Depot Vehicle Routing Problem (MDVRP) that can be solved by being decomposed into two sub-problems, i.e. assignment problem and a set of vehicle routing problems. The assignment problem allocates customers to the nearest depots while vehicle routing problem determines the optimal routes to serve customers assigned to each depot. However, most of existing approaches did not consider the interrelation between these two sub-problems, which in turn impairs the solution quality of the overall problem. This paper presents an improved two-level mathematical modelling approach to evaluate and optimize the implementation of the collaborative freight distribution in urban areas. Unlike existing studies, the proposed approach considers the interrelation among the two-sub problems. A real-life case is used to illustrate the savings obtained from the collaborative distribution. In addition, the significance of the proposed approach is demonstrated by a comparison against a similar approach found in literature.

ACS Style

Ahmed Karam; Sergey Tsiulin; Kristian Hegner Reinau; Amr Eltawil. An Improved Two-Level Approach for the Collaborative Freight Delivery in Urban Areas. LISS2019 2020, 775 -787.

AMA Style

Ahmed Karam, Sergey Tsiulin, Kristian Hegner Reinau, Amr Eltawil. An Improved Two-Level Approach for the Collaborative Freight Delivery in Urban Areas. LISS2019. 2020; ():775-787.

Chicago/Turabian Style

Ahmed Karam; Sergey Tsiulin; Kristian Hegner Reinau; Amr Eltawil. 2020. "An Improved Two-Level Approach for the Collaborative Freight Delivery in Urban Areas." LISS2019 , no. : 775-787.

Journal article
Published: 15 April 2020 in Sustainability
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Despite a significant number of studies that have focused on the operational efficiency of container terminals, existing literature has paid little attention to improving energy efficiency, e.g., energy consumption and negative externalities in container terminals. Most researchers consider energy-saving goals when allocating berths and quay cranes to vessels, assuming that internal trucks are in sufficient supply. Furthermore, recent studies have revealed that shortage of internal trucks has become an issue that greatly affects the operational and energy efficiencies of container terminals. This work presents a planning model that integrates berth allocation, quay crane assignment, and internal truck assignment problems. The developed model contributes to existing literature by including energy-saving goals in the integrated planning of these problems, as well as including important realistic factors such as shortages of internal trucks and handling time estimations, thus producing a reliable handling plan that achieves energy and cost savings without additional truck investment. To solve realistic problems, a Lagrangian relaxation-based method is developed. Furthermore, the benefits of the developed approach are demonstrated by comparing it to an existing approach. On average, our approach could improve the solutions of the integrated problem with different numbers of internal trucks by 6% compared to the solutions obtained using the existing approach.

ACS Style

Ahmed Karam; Amr Eltawil; Kristian Hegner Reinau. Energy-Efficient and Integrated Allocation of Berths, Quay Cranes, and Internal Trucks in Container Terminals. Sustainability 2020, 12, 3202 .

AMA Style

Ahmed Karam, Amr Eltawil, Kristian Hegner Reinau. Energy-Efficient and Integrated Allocation of Berths, Quay Cranes, and Internal Trucks in Container Terminals. Sustainability. 2020; 12 (8):3202.

Chicago/Turabian Style

Ahmed Karam; Amr Eltawil; Kristian Hegner Reinau. 2020. "Energy-Efficient and Integrated Allocation of Berths, Quay Cranes, and Internal Trucks in Container Terminals." Sustainability 12, no. 8: 3202.

Articles
Published: 19 May 2019 in International Journal of Modelling and Simulation
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In Container Terminals (CTs), many containers are daily delivered by a large number of External Trucks (ETs) which lead to several issues such as long waiting times at gates and yards, harmful emissions, and low productivity of the CTs. To resolve these issues, truck appointment systems are used to schedule appointments of ETs and achieve more balance in CTs’ workload. Most of the studies have focused on deterministic modelling of the ETs’ arrival process with considering yard operations or gate operations. Also, a little effort has been devoted to collaboration between trucking companies and CTs when scheduling ETs’ appointments. Unlike previous studies, this paper presents a simulation-based optimization approach to collaboratively schedule ETs’ appointments with considering yard and gate operations as well as their stochastic natures. The proposed approach integrates a simulation model with an MIP model with objective of minimizing turnaround times of ETs and inconveniences resulting from shifting the arrivals of ETs away from their preferred arrival times. The proposed approach is validated against an approach from literature. In addition, its performance is investigated by solving artificial instances inspired by real data. A framework for implementing the proposed system in the IoT-based container terminals is also developed.

ACS Style

Ahmed Azab; Ahmed Karam; Amr Eltawil. A simulation-based optimization approach for external trucks appointment scheduling in container terminals. International Journal of Modelling and Simulation 2019, 40, 321 -338.

AMA Style

Ahmed Azab, Ahmed Karam, Amr Eltawil. A simulation-based optimization approach for external trucks appointment scheduling in container terminals. International Journal of Modelling and Simulation. 2019; 40 (5):321-338.

Chicago/Turabian Style

Ahmed Azab; Ahmed Karam; Amr Eltawil. 2019. "A simulation-based optimization approach for external trucks appointment scheduling in container terminals." International Journal of Modelling and Simulation 40, no. 5: 321-338.