Maritime Activities Research Articles

Maritime Justice: Socio‐Legal Perspectives on Order‐Making at Sea

Illicit maritime activities generate significant scholarly and policy attention. While diverse in nature, governance responses share many regulatory features. This introduction advances the notion of maritime justice, a socio‐legal research agenda. Different from broader maritime security studies, it places law at the centre of the inquiry, studying maritime governance practices through the lens of regulation. Empirically, it covers operational, spatial, and structural junctions between illicit maritime activity and regulatory responses deriving from international and domestic law. Analytically, it is heterogeneous but holds a methodological commitment to studying everyday law enforcement practices of maritime security governance to disentangle its meanings and effects. The introduction posits the junction between illicit maritime activities and regulatory responses as a productive space to study the varied norms that shape order‐making at sea, and vice versa.

Modified REL-Based Piecewise Path Loss Modeling Approach for Shore-to-Ship Communication at 5.6 GHz

The need for reliable and uninterrupted communication systems in the marine environment has become critically important with increasing maritime activities, environmental monitoring, and the spread of autonomous systems. However, the complex structure of electromagnetic wave propagation in a sea environment limits the accuracy of the existing propagation models. Thus, the Modified Round Earth Loss (REL) model was first developed in this study to estimate the path loss more accurately in shore-to-ship communication. Subsequently, a piecewise modeling approach based on the principle of two-segment data modeling was proposed. In the Modified REL model, unlike the traditional REL model, the paths and gains of the direct and reflected waves were not considered equal in the calculations. Moreover, unlike in the classical approach, the receiver height was not taken as a fixed value; the estimated best receiver height value for each measurement was included in the calculations as a representation of the effect of roughness in the sea environment. Thus, the model is better adapted to various environmental conditions. In addition, the proposed piecewise model divides the propagation medium into two regions using a break point calculated by Fresnel zone theory. The Modified REL model was used for the first region and the log-distance model was used for the second region. This method allows for more accurate modeling of signal behaviors, especially at different distances. Experimental measurements and performance evaluations conducted using four different shore-to-ship communication scenarios show that the Modified REL model shows an average improvement of up to 3% in Root Mean Square Error (RMSE) values compared to the classical REL model. Additionally, the proposed piecewise model improves the fitting error of the Modified REL model, which models the data as a single whole, by an average of 22.25%. These findings emphasize the necessity of propagation models that are sensitive and adaptable to environmental changes for maritime communication.

A probabilistic assessment of ship blackout incident with Fault Tree Analysis into (FTA) Bayesian Network (BN)

Blackouts in maritime activities can cause propulsion loss and dangerous maritime conditions. Bayesian risk analysis is applied to ship blackout incidents in this study to improve understanding and reduce risks. Using Fault Tree Analysis (FTA), a Bayesian Network (BN) model incorporates fuel quality, lubricating oil quality, sensor error, injector error, and mechanical defects to estimate blackout probability. The model analyses how hazards and their interactions affect this situation using probabilistic inference. Sensitivity analysis identifies variables that affect blackout probabilities and prioritises risk mitigation solutions. Based on prior and posterior probabilities, ‘Automatic Voltage Regulator Failure’ (0.03 prior, 0.17 posterior), ‘Rotor Mechanical Fault’ (0.03 prior, 0.15 posterior), and ‘High Cooling Water Temperature’ (0.03 prior, 0.13 posterior) are the top three blackout causes. Other significant variables include ‘Switchboard Line Failure,’ ‘Faulty Fuel Pump,’ ‘Rotor Open Circuit,’ and ‘Temperature Sensor Failure’ in relative amounts. Bayesian risk analysis can identify and minimise marine blackout concerns, giving decision-makers a comprehensive framework for informed decision-making and proactive risk management. This research emphasises blackout accidents’ importance, improving maritime transportation safety and reliability.

Current levels of inorganic and organic pollutants in Romanian marine waters: Implications for ecosystem health

Human activities continue to impact the Romanian Black Sea, with implications for the marine ecosystem. This study presents new data (2023) on the spatial distribution of heavy metals, persistent organic pollutants, and nutrients in Romanian Black Sea waters. Our findings reveal the influence of various pollution sources, including the Danube River, municipal and industrial discharges, and maritime activities. Nutrient loads, primarily from the Danube and diffuse sources, exert pressure on the pelagic habitat. While there has been some improvement in nutrient conditions, the potential for increased eutrophication due to climate change remains a concern. Understanding the spatial distribution of pollutants and identifying their sources is crucial for developing effective management strategies to protect the marine environment.

Navigational Insights during the Reign of Cyrus the Great: A Comprehensive Examination Based on Archaeological Findings Such as Clay Tablets, Reliefs, and an Analysis of Historical and Literary Texts

One of the earliest indications of Iranian navigation during the Achaemenid period is a relief found in the audience hall of Cyrus the Great in Pasargadae, bearing the appellation “God of Water and Sea.” The primary focus of this article is to investigate whether navigation and maritime activities during the reign of Cyrus the Great were influenced by and expanded upon Phoenician techniques and Mesopotamian regions. Prior studies have generally taken a historical and overarching approach to this subject. Since complete trust cannot be placed in historical references and texts, and given the existence of certain deficiencies and even contradictions in the writings of ancient historians such as Herodotus, Xenophon, and others, this research aims to shed new light on the obscure aspects of navigation and seafaring during this era, relying on archaeological findings such as the clay tablets, relief, and a reexamination of previous literary and historical texts. This article employs an analytical-descriptive methodology and a library-based approach. Among the archaeological findings from this period, a total of two reliefs in Pasargadae and two clay tablets are subject to investigation and research. The examination of the artifacts and findings from Pasargadae demonstrates that the Achaemenids indirectly came under the influence of Phoenician art and Mesopotamian regions concerning navigation. Furthermore, in the pursuit of maritime development, trade, and shipping, they were directly influenced by the Phoenicians. With the acquisition of maritime power, they successfully annexed many neighboring lands to their powerful empire.

Challenges and Security Risks in the Red Sea: Impact of Houthi Attacks on Maritime Traffic

This study examines the significant impact of Houthi insurgent activities on maritime traffic within the strategic Red Sea and Suez Canal routes, essential conduits for global trade. It explores the correlation between regional instability, exemplified by Houthi actions from 19 November 2023 to 5 February 2024, and changes in maritime traffic patterns and operational efficiency. This study seeks to answer a critical question in transport geography: how does regional instability, exemplified by Houthi insurgent activities, affect the maritime traffic patterns and operational efficiency of the Red Sea and Suez Canal? Using descriptive statistics, qualitative analysis, and geospatial methods, this research highlights recent trends in maritime traffic and incidents, revealing spatial and geopolitical challenges in this crucial trade route. The findings indicate a notable decline in maritime activity in the Gulf of Aden and Suez Canal due to security concerns from Houthi attacks, prompting a significant shift to alternative routes, particularly around the Cape of Good Hope. This shift underscores the broader implications of regional instability on global trade and the importance of maintaining an uninterrupted maritime flow. This study also emphasizes the economic ramifications, such as increased operational costs and freight rates due to longer transit times and enhanced security measures. This research concludes with a call for improved maritime security protocols and international cooperation to protect these strategic maritime pathways. It contributes to the discourse on transport geography by quantifying the direct impacts of regional conflicts on maritime logistics and proposing strategies for future resilience, highlighting the interconnected nature of global trade and security and the need for collective action against evolving geopolitical challenges.

Development Potential of Fisheries as a Maritime Activity in Supporting Area Planning

This paper aimed to identify and discuss the gains on the development of fishery, maritime tourism and community engagement towards the regional planning of Belakang Padang District in Indonesia. Based on both exploratory and explanatory qualitative and quantitative data collected for the study, the study establishes and examines the economic, cultural, and environment opportunities and barriers to region development in the district. The studies show that fisheries are the largest and most important economy sector that influences the planning of regions; at the same time, the challenges are observed in terms of outdated technique and restricted access to markets. Maritime tourism has a lot of prospects and long-term influences for countries but it is restricted by the lack of sufficient infrastructure and capital. The study also highlights a major research agenda concerning the lack of citizenship in planning where most of the local actors are rarely involved in planning processes. Environmental sustainability as an additional challenge was discovered with pollution together with the inadequate disposal of wastes contributing to the harm of the district’s development. Therefore, the study recommends an integrated regional development plan, focusing on the modernization of fisheries, tourism development, participation of community and conservation of the environment as key factors for sustainable development of Belakang Padang. Hence the research is useful in the existing literature on sustainable coastal development and charles district future planning activities.

ЗАДАЧИ ПО ПРЕДОТВРАЩЕНИЮ ПРИРОДНЫХ ЧРЕЗВЫЧАЙНЫХ СИТУАЦИЙ НА АКВАТОРИИ МОРЕЙ РОССИЙСКОЙ АРКТИКИ (ПО МАТЕРИАЛАМ МОРСКОЙ ДОКТРИНЫ РОССИЙСКОЙ ФЕДЕРАЦИИ)

This article provides an overview of the main organizational and managerial tasks to ensure protection from natural emergencies during marine activities in the Arctic zone of the Russian Federation. The main mechanism for ensuring the safety of maritime economic activity in the Arctic is called the prevention of emergency situations by forecasting them. The problems of natural (climatic extremes) emergencies are emphasized, the main directions of obtaining predictive information, scientific and scientific-technical activities, and the tasks of legal regulation are briefly outlined. The guideline for the presentation of the topic of the article is the Maritime doctrine of the Russian Federation – a strategic act of the Head of state, which contains the main provisions on the principles and mechanisms of maritime activities in the Russian Federation. The result of this study is the positioning of emergency forecasting as an inseparable segment of activity in the Arctic from the economy.

Digital Transformation in the Maritime Industry; Opportunities and Challenges for Indonesia

Digital transformation is reshaping industries worldwide, including the maritime sector, by integrating advanced technologies to improve efficiency, safety, and sustainability. In the context of Indonesia, a country with a vast archipelago and significant maritime activities, digital transformation offers substantial opportunities but also presents distinct challenges. This paper explores the multifaceted impacts of digital transformation on Indonesia's maritime industry, examining both the opportunities and challenges that arise from this technological shift. Opportunities in the maritime sector include enhanced operational efficiency, improved safety, and better environmental management. Technologies such as the Internet of Things (IoT), big data analytics, artificial intelligence (AI), and blockchain are pivotal in optimizing logistics, predictive maintenance, and real-time monitoring of vessels and cargo. These advancements can lead to reduced operational costs, minimized human errors, and lower environmental footprints. For Indonesia, leveraging these technologies could significantly boost its competitiveness in global shipping, enhance port operations, and support the sustainable management of its extensive marine resources. However, the journey towards digital transformation in Indonesia’s maritime industry is fraught with challenges. Key issues include inadequate digital infrastructure, limited technological expertise, and regulatory hurdles. The uneven distribution of digital infrastructure across Indonesia's archipelago hampers the consistent application of advanced technologies. Additionally, the maritime workforce requires upskilling to handle new digital tools effectively, necessitating substantial investment in education and training. Regulatory frameworks also need to evolve to address data security, privacy concerns, and the integration of international standards, ensuring a seamless transition to digital operations.

Design of a turbo-based deep semantic autoencoder for marine Internet of Things

With the rapid growth of the global marine economy and flourishing maritime activities, the marine Internet of Things (IoT) is gaining unprecedented momentum. However, current marine equipment is deficient in data transmission efficiency and semantic comprehension. To address these issues, this paper proposes a novel End-to-End (E2E) coding scheme, namely the Turbo-based Deep Semantic Autoencoder (Turbo-DSA). The Turbo-DSA achieves joint source-channel coding at the semantic level through the E2E design of transmitter and receiver, while learning to adapt to environment changes. The semantic encoder and decoder are composed of transformer technology, which efficiently converts messages into semantic vectors. These vectors are dynamically adjusted during neural network training according to channel characteristics and background knowledge base. The Turbo structure further enhances the semantic vectors. Specifically, the channel encoder utilizes Turbo structure to separate semantic vectors, ensuring precise transmission of meaning, while the channel decoder employs Turbo iterative decoding to optimize the representation of semantic vectors. This deep integration of the transformer and Turbo structure is ensured by the design of the objective function, semantic extraction, and the entire training process. Compared with traditional Turbo coding techniques, the Turbo-DSA shows a faster convergence speed, thanks to its efficient processing of semantic vectors. Simulation results demonstrate that the Turbo-DSA surpasses existing benchmarks in key performance indicators, such as bilingual evaluation understudy scores and sentence similarity. This is particularly evident under low signal-to-noise ratio conditions, where it shows superior text semantic transmission efficiency and adaptability to variable marine channel environments.

REGIONALISM IN PUBLIC ADMINISTRATION OF UNDERWATER CULTURAL HERITAGE REGIME

The article is devoted to the characteristics of the peculiarities of public administration of underwater cultural heritage regime in the regions whose water areas are significantly rich in such objects. The research of regional specifics of legal regulation and organizational mechanisms of the maintenance of the operational regime aimed at underwater cultural heritage represents experience of countries that are parties to the 2001 UNESCO Convention on the Protection of Underwater Cultural Heritage and those who have not yet adhered to it. The relevance of the research issues is determined by the necessity to create the concept of the public administration of underwater cultural heritage regime in Ukraine based on the best international practices and progressive experience of the functioning of comprehensive legal regimes of sea areas and regional cooperation. The article aims to determine the main tendencies, the best tools and mechanisms of the public administration of underwater cultural heritage regime in the range of regions of the world, whose water areas are significantly rich in such objects. The article’s purpose is to suggest proposals regarding the adoption of the positive experience and implementation of the new practices of legal regulation and organizational support of the underwater cultural heritage regime in Ukraine. The methodological basis of the research is composed of general scientific and special legal methods of scientific knowledge (historical, statistical, analysis and synthesis, comparative, scientific abstraction, forecasting, simulation). The authors describe the main modern risks for underwater cultural heritage and the ways of their potential detrimental effects elimination. Within the classical ways of regional cooperation in the field of maritime activity, the joint efforts and national approaches to public administration of underwater cultural heritage regimes in Mediterranean, Black Sea and Caribbean Basins have been characterized. It was mentioned that typical features of such administration include the establishment of specially authorized national management bodies, approval of relevant legislation and regional specialized treaties, cooperation with interested parties and digitization of vaults of museums and underwater objects in situ. Special attention was drawn to the necessity of the development of national legislation of Ukraine on the activity in the field of underwater cultural heritage, to the intensification of efforts regarding cooperation on regional and global basis, as well as to the implementation of new technical opportunities for activation of underwater historical, cultural and archeological artifacts digitization.

Ship emission variations during the COVID-19 from global and continental perspectives

The COVID-19 pandemic and the International Maritime Organization's (IMO) 2020 fuel-switching policy have profoundly impacted global maritime activities, leading to unprecedented changes in shipping emissions. This study aimed to examine the effects from different scales and investigate the underlying drivers. The big data model Ship Emission Inventory Model (SEIM) was updated and applied to analyze the spatiotemporal pattern of global ship emissions as well as the main contributors in 2019 and 2020. Overall, ships emitted NOx, CO, HC, CO2, and N2O declined by 7.4 %–13.8 %, while SO2, PM2.5, and BC declined by 40.9 %–81.9 % in 2020 compared with 2019. The decline in CO2 emissions indicated a comparable reduction across vessel tonnages. Ship emissions occurring at cruising status accounted for over 90 % of the ship's CO2 emission reduction. Container ships, chemical tankers, and Ro-Ro vessels were the primary contributors to the emission reductions, with container ships alone responsible for 39.4 % of the CO2 decrease. The ship's CO2 emissions variations revealed the decline-rebound patterns in response to the pandemic. Asian-related routes saw emissions drop in February 2020, followed by a rebound in May, while European and American routes experienced declines starting in May, with a recovery in August. Further analysis of CO2 emission in Exclusive Economic Zones (EEZs) showed high temporal consistency between vessel CO2 emissions, sailing speeds, and international trade volumes across continents, and exhibited heterogeneity in main contributing ship type of emission reduction on continental scale. Our study reveals the short-term fluctuation characteristics of global ship emissions during the pandemic, particularly focusing on their spatiotemporal evolution and the inherent disparities. The results highlight the correlation between global ship emissions and trade, as well as the operational status of ships, and their rigidity.

Anthropogenic noise and impact on marine species : Acoustic metamaterials as a reduction solution

Anthropogenic underwater noise generated by offshore maritime activities poses a significant threat to nearby ecosystems due to elevated sound levels. Efforts have to be undertaken on noise reduction solutions, depending both on the offshore activities and on the marine species. In this context, leveraging the recent advances in underwater acoustic metamaterials seems crucial, due to their special properties in terms of scattering and absorption. This endeavor aligns with advancing Marine Renewable Energies while minimizing environmental impact. In this communication, a synthetic review is first proposed to define the various maritime works targeted, as well as their associated sound levels and frequency ranges of emission. In a second part, a cartography is outlined by classifying different marine species according to their hearing type, depth of immersion and auditory threshold. Then, in relation with the two previous analyses, solutions based on metamaterials for deep sea immersions are proposed. In particular, a multi-periodic arrangement of bars is proposed that exhibits several band gaps (i.e. frequency ranges in which propagation is forbidden), in order to limit the transmission of sound waves in a large frequency range. The concept can be easily extended depending on the targeted offshore activities and marine species.

Employment conditions, conflicts, and new challenges along the transport-logistics chain

Logistics, understood as a management tool for the flow of goods and transport, has emerged as a strategic aspect of the economy. The complexity of a logistics transport chain is correlated with the increasing structuring of firms into networks and the fragmentation of global value chains. While the modern economy demands greater synchronization, the Covid-19 pandemic highlighted that a disruption to any link in the chain can have systemic impacts. The pandemic has placed significant pressure on global supply chains, affecting employment conditions, particularly on ships, in warehouses, and in last-mile logistics. Labor market distortions are offset by intense competition along the logistics chain, encompassing maritime activities, cargo handling in ports, and transport services in the hinterland, where distribution centers are located. In this introduction, we define logistics as a complex and diverse field, elucidating key aspects not yet fully addressed in the scientific literature. This Special Issue aims to enrich the scientific debate on logistics by exploring the evolving dynamics along the logistics chain with a focus on labor issues. We examine logistics and transport infrastructures by posing questions aimed at facilitating comprehensive empirical descriptions and broad theoretical reflections on contemporary forms of labor.

The Impact of Anchoring on Seafloor Integrity: An Integrated Assessment within a Major Bunkering Area of the Maltese Islands

International shipping is a fundamental component of the global economy. As the industry expands, the demand for high-capacity vessels increases, raising concerns about their impact on the marine environment. While awaiting access to port facilities, vessels often anchor to save fuel and prevent drifting, but this practice is a significant cause of mechanical disturbance to the seafloor and benthic habitats. Identifying and quantifying anchoring pressure is essential for better managing and mitigating the damage to the seafloor. The Automatic Identification System (AIS) can be utilized to assess anchoring pressure by transmitting vessel information (e.g., position, type and size) to other vessels and coastal stations. This research evaluates anchoring pressure in a strategically located bunkering area around the Maltese Islands using AIS data collected from an antenna at the University of Malta. An arbitrary index was developed to determine anchoring pressure, and the AIS data was used to create GIS maps showing the location and size of vessels within the bunkering area, as well as plots depicting anchoring pressure by vessel type, seasonality, and density. This study serves as a blueprint for future assessments of anchoring pressures from various maritime activities in other areas around the Maltese Islands and provides a decision support tool for national policy-making related to Descriptor 6 (Seafloor Integrity) of the Marine Strategy Framework Directive (MSFD), the Maritime Spatial Planning Directive (MSPD), and the management plan for Sites of Community Interest (SCI) and Marine Protected Areas (MPAs).

Addressing offshore wind farms compatibilities and conflicts with marine conservation through the application of modelled benchmarking scenarios

Offshore wind power generation structures are scheduled for development in the Canary Islands, potentially resulting in spatial overlap with various maritime activities, particularly fishing. It is crucial to point out that some areas that are considered suitable for installing these structures are in protected zones that are part of the Natura 2000 network, and do not have any prior environmental impact assessments. The research delved into the efficacy of utilizing Ecopath with Ecosim software to examine the consequences of implementing this technology in the study area, employing an ecosystem-based approach. To address this question, simulations were executed by assessing three distinct scenarios. The results suggest that there would be changes in the distribution of keystone species such as top predators, alongside a conspicuous decline in the abundance and catches of target species of the fishery. The Ecospace model holds the potential to forecast the impacts of offshore wind installations; however, crucial factors must be carefully considered, such as the lack of information. Notwithstanding the constraints, research like this demonstrates the efficacy of spatial ecosystem modelling in exploring this issue.

Stable carbon isotope reveals high impact of fishing ship activities on total carbon from PM2.5 in Qingdao, China

Although total carbon (TC) is an important component of fine particulate matter (PM2.5: particulate matter with aerodynamic diameter of <2.5 μm); its sources remain partially unidentified, especially in coastal urban areas. With ongoing development of the global economy and maritime activities, ship-generated TC emissions in port areas cannot be neglected. In this study, from September 11, 2017 to August 31, 2018, we collected 355 p.m.2.5 samples in Qingdao, China, to determine the water-soluble ion concentrations, TC concentrations, and stable carbon isotopes (δ13CTC). During the open fishing season (OFS; September 11, 2017 to April 30, 2018) and the closed fishing season (CFS; May 1, 2018 to August 31, 2018), the TC concentrations were 9.30 ± 5.38 μg/m3 and 3.36 ± 2.10 μg/m3 respectively, and the corresponding δ13CTC values were −24.53‰ ± 1.17‰ and −27.03‰ ± 0.91‰, respectively, indicating significant differences (p < 0.05) between the two periods. The differences in TC concentrations and the δ13CTC values between the OFS and CFS reflect changes in the source of contamination. Bayesian model was used to quantify the contributions of different TC sources, revealing that ship emissions accounted for approximately 35.3% of the total, which was close to the contribution from the largest source, i.e., motor vehicles (39%). Using the ship emission inventory, Qingdao's ship emissions were further quantified at 455 metric tons, representing 35%–40% of the total TC emissions around Qingdao. Notably, fishing ships contributed approximately 40% of the total ship emissions. These findings underscore the considerable impact of ship emissions, particularly those from fishing ships, on TC concentrations in coastal urban areas.

Reconstruction of significant wave height distribution from sparse buoy data by using deep learning

Significant wave height plays a crucial role in influencing marine ecosystems, ocean shipping, and other maritime activities. The distribution of buoy observation data tends to be sparse. Gridded wave data obtained through numerical simulation typically offer broader applicability, albeit with higher computational demands. In this paper, a deep learning model based on Full Connected and Convolutional Neural Networks is proposed, utilizing sparse buoy observation data as input to reconstruct the distribution of significant wave height in the sea area. The model reconstruction results are validated using ERA5 data, demonstrating excellent performance. Additionally, we explore the influence of the model's spatial boundaries and the number of input buoys on reconstruction accuracy, as well as the adaptability of the model to different sea areas. This study provides a novel method and approach for the rapid and cost-effective retrieval of regional significant wave height.

On Maritime Activities in the History of Islamic Civilization

This study examined the maritime activities of Muslims throughout history and their focused on contributing to the history of world civilization. In this context, looking at the important milestones in the history of the maritime activities of Muslims will make it easier to understand the natural development processes of maritime throughout history that extends to the present day. Thus, it will help to understand the interaction of the periodical developments with the maritime of the Muslims. This interaction is an indication that Muslims will have effective guiding power in the maritime activities of the future and will leave an important trace in the history of world civilization. Towards the middle of the 7th century, Muslims dominated the eastern Mediterranean with their own fleets. When they started to conquer the islands in this region in a short time, they had the whole of the Mediterranean. Thanks to their deep knowledge in astronomy, geography, geometry and mathematics, Muslims made important developments in the field of maritime in a short time. The aim of this study is to give information about the activities of Muslims and to evaluate their contribution to the history of world civilization in general.

A Non-Uniform Grid Graph Convolutional Network for Sea Surface Temperature Prediction

Sea surface temperature (SST) is an important factor in the marine environment and has significant impacts on climate, ecology, and maritime activities. Most existing SST prediction methods consider the ocean as a uniform field and use a uniform grid to predict SST. However, the marine environment is a complex system, and factors such as solar radiation, differences in land and sea thermal properties, and ocean circulation lead to uneven spatial distributions of SSTs. We propose a non-uniform grid construction method based on an SST spatial gradient to encode SST data, as well as a Non-uniform Grid Graph Convolutional Network (NGGCN) model. The NGGCN consists of two spatiotemporal modules, each of which extracts spatial features from the GCN module, captures temporal correlations through the GRU module, and performs feature restoration and output results through the fully connected module. We selected data from the Yellow Sea and Bohai Sea to validate the effectiveness of the NGGCN in predicting SST at different time scales and prediction steps. The results indicate that our model shows a significant improvement in prediction performance compared to other models.