Pomorstvo-Scientific Journal of Maritime Research最新文献

{"title":"Condition Monitoring and Fault Diagnosis of a Marine Diesel Engine with Machine Learning Techniques","authors":"G. Koçak, Veysel Gokcek, Yakup Genç","doi":"10.31217/p.37.1.4","DOIUrl":"https://doi.org/10.31217/p.37.1.4","url":null,"abstract":"A marine engine room is a complex system in which many different subsystems are interacting with each other. At the center of this system is the main diesel engine which produces the propulsion force. Many other components such as compressed air, cooling, heating, lubricating oil, fuel, and pumping systems act as auxiliary machines to the main engine. Automation of many functions in the engine room is starting to play an important role in new generation ships to provide better control using sensors monitoring the engine and its environment. Sensors exist in the current generation ships, but engineers evaluate the sensor data for the presence of any problems. Maintenance actions are taken based on these manual analyses or regular maintenance is carried out at times determined by manufacturers, whether such actions are needed or not. With machine learning, it is possible to develop an algorithm using past evaluations made by engineers. Recent studies show that highly accurate results can be obtained using machine learning methods when there is sufficient data. In this study, we develop new learning-based algorithms and evaluate them on data obtained from a realistic ship engine room simulator. Data for a predetermined set of parameters of a high-power diesel engine were collected and analyzed for their role in a set of fault situations. These fault conditions and the associated sensor data are used to train a set of classifiers achieving fault detection up to 99% accuracy. These are promising results in preventing future damage to the engine or its supporting components by predicting failures before they occur.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46676674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"International Marine Tourism","authors":"M. Troian, O. Prokopenko, M. Järvis, V. Saichuk, Igor Komarnitskyi, V. Glybovets","doi":"10.31217/p.37.1.3","DOIUrl":"https://doi.org/10.31217/p.37.1.3","url":null,"abstract":"In today’s globalised and open world, international marine tourism needs renewal, reorganisation and definition of perspectives, including in the context of the concept of sustainable development. In order to determine the state and possible prospects for the development of international marine tourism in the context of sustainable development priorities, a bibliometric and contextual analysis of the conclusions and recommendations of selected scientific publications was carried out. Relevant publications since 1987 were searched using the Dimensions research database search engine. This analysis identified the trend in the number of publications, the most numerous research categories according to Fields of Research and the Sustainable Development Goals, the most productive journals and the network of authors. As a result of the contextual analysis of the selected articles, the need for (1) management reforms and (2) scientific research at all levels, in accordance with the concept of sustainable development and the Global Code of Ethics in Tourism, (3) clustering and externalization of marine tourism in accordance with the orientation towards specific community and (4) further development of the blue economy and protection and restoration of natural resources of coastal areas as a basis for marine tourism activities. The results of the research can be useful for the scientific community, the general public and specialists in the field of bibliography.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42477121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematic Review of Port Choice Criteria for Evaluating Port Attractiveness Determinants (PART I)","authors":"Abdelhamid Adarrab, Mohamed Mamad, A. Houssaini, Mohamed Behlouli","doi":"10.31217/p.37.1.8","DOIUrl":"https://doi.org/10.31217/p.37.1.8","url":null,"abstract":"The aim of this systematic literature review is to identify the Port Attractiveness Determinants (PADs) and their attributes. These attributes have been extracted from 87 references published between 1970 and 2022. In addition to the conceptual contribution, this review has added value at the methodological and empirical levels. Split in two parts, Part I of this paper presents the findings about the nine PADs identified in the sample screened, which stem from both bibliometric and content analyses performed using software programs and an in-depth screening performed by four reviewers. Part II of this review details the 116 items measuring the PADs.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49045455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Schedule Reliability in Liner Shipping","authors":"İlknur Gizem Yazar Okur, Okan Tuna","doi":"10.31217/p.36.2.22","DOIUrl":"https://doi.org/10.31217/p.36.2.22","url":null,"abstract":"Due to the complex structure of the transportation systems, disruptions in transport operations may occur from time to time. In liner shipping, it is seen that shipping lines frequently deviate from the transit times announced in their vessel schedules, and this leads to schedule unreliability. This leads to schedule unreliability and affects all stakeholders. Based on actual transportation data, this study aims to evaluate the transit time reliability performance of shipping lines and the factors that may affect transit time reliability to investigate schedule reliability in liner shipping. To evaluate the transit time reliability of shipping lines’, transit time deviations were calculated based on observations containing 5080 transport data of shipping lines and current performances are discussed. Hypotheses were tested with independent sample t-test and Welch’s ANOVA to examine the factors affecting transit time reliability. Tamhane’s T2 post-hoc test was used to determine the difference between groups. Results show that transit time reliability of shipping lines is low. It has been observed that the type of service, season, vessel age, and TEU capacity of the vessel factors affect the transit time reliabillity. With this study, shipping lines can evaluate their reliability performances according to the competition. At the same time, lines can use these results to understand, evaluate and manage factors that affect their transit time reliability. In this direction, suggestions have been made to the shipping lines to contribute to improving transit time reliability and service quality. This article is regarded to close the gap in evaluating transit time reliability in liner transportation because it relies on actual transportation data.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49275906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Marina Business in Relation to Development","authors":"Damir Piplica, I. Peronja, T. Luković","doi":"10.31217/p.36.2.20","DOIUrl":"https://doi.org/10.31217/p.36.2.20","url":null,"abstract":"Marina Business, or Marina in&with Business is a new term in the terminology of nautical tourism, introduced in Croatia in the conditions of COVID-19. In other words, the COVID-19 pandemic has exposed the old, disorganized relationships of entities operating in and with marinas. The damaged relations during the pandemic showed all the illogic in their existing relations as well as the damage to the better results of Croatian charters and ports of nautical tourism, especially marinas. The fact that the state distanced itself from the economy and the development of entrepreneurship was reflected in the development of nautical tourism in Croatia, which developed independently in all its sub-forms after the Homeland War. Favourable post-war opportunities on the market of nautical tourism offer, i.e. lagging in the development of nautical tourism capacities and high dynamics of tourism demand, favoured nautical tourism enterprises that achieved positive business results until the outbreak of the COVID-19 pandemic. If the problem of cruising is excluded, both large world cruises and small domestic cruises, nautical tourism ports, especially marinas and charters, developed dynamically, but with the intention of doing profitable business, the problems gradually deepened. At the same time, the relationship problem could not be solved due to the good mutual business results. The emergence of the pandemic in 2020 showed the other side of the cooperative relationship between charterers and marinas, which for both subjects led to the distancing of the state in aid programs that should have been specific and not general for subjects of all types of businesses. In addition to the problems of charters and marinas, it is also necessary to consider the activity of skippers, who are of great importance for Croatian charter, which is considered the largest in the world. The services of skippers are used by about 40% of sailors, and they are an important segment for the success of the Croatian charter business. It should be noted here that in the further paragraphs of this paper the terms nautical tourism ports and marinas will be used, and this is because charter is mainly located in marinas and only to a lesser extent in other forms of nautical tourism ports, so it is also mentioned in nautical tourism ports. Thus, the relationship “marina-charter-skippers” represents a working symbiosis that links it to the intention of all successful businesses. The goal of the research is to valorise the factors of the quality of business cooperation and good business relationships that ensure profitable business for everyone. The research hypothesis states that the necessary good business cooperation can be achieved through a higher level of cooperation than before.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46470052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the cost-benefit method in the feasibility analysis of the Pelješac Bridge construction","authors":"Hrvoje Baričević, Vlatka Ružić, Mile Perić","doi":"10.31217/p.36.2.10","DOIUrl":"https://doi.org/10.31217/p.36.2.10","url":null,"abstract":"In the context of the construction of road infrastructure facilities, there is no doubt that the construction of new roads leads to an increase in the quality of transport services. A new road fosters the development of settlements through which it passes, and indirect benefits are achieved through new investments. Cost-benefit analysis (CBA) as a method involves consideration of a project’s financial returns, and most data on project costs and benefits are obtained through a relatively detailed financial analysis. Any independent variable reflected in the change results in a set share in project analysis; it is a critical variable and must be evaluated as reliably as possible. The implementation of a historical capital project in the Republic of Croatia has been highlighted in this paper – the construction of the Pelješac Bridge. Based on the transport criterion, the research has shown significant advantages achieved by bridge construction in the surrounding and wider area. The positive effects of demographic, economic, and social parameters are multiplying. The economic effects of bridge construction are highly favourable since, on the one hand, they are expressed as benefits in terms of savings on the costs of all activities from primary to quintary. On the other hand, they represent multiplications regarding the use and revitalisation of employment and natural resources. In accordance with the expected faster economic growth, the offer structure will cause a change in the relations within service activities in the direction of strengthening investments, intellectual services, tourism with all of its accompanying activities, etc. In the case considered, non-measurable benefits have not been quantified, although, independently from the CBA, their feasibility is fundamental. Nota bene, this primarily refers to the political component in strategic decision-making, such as the integration of regions, i.e., the achievement of the state territory integrity.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43687871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cross examinations of maritime trade disruptions in Africa during COVID-19 pandemic","authors":"O. M. Olapoju","doi":"10.31217/p.36.2.2","DOIUrl":"https://doi.org/10.31217/p.36.2.2","url":null,"abstract":"This study examined the influence of the disruption of COVID-19 on maritime shipping activities in Africa. Particular attention was paid to the variations in the performance of selected African countries in container ship calls, container throughput, and liner shipping connectivity between 2019 and 2020. Eighteen (18) African countries were selected from all the geographical regions of the continent based on data availability. Secondary data was drawn from records of maritime trade in the publications of the United Nations Conference on Trade and Development (UNCTAD) (2019, 2020, and 2021) as well as World Bank Development Indicators for the selected countries. Explorative data analysis was used to organize and present the data. Results showed that the North African region alone recorded an improved percentage of container ship calls in 2020 than in 2019. Results by individual countries showed that Ghana recorded the highest positive increase in ship calls in 2020 from her record in 2019. In addition, Morocco, recorded the highest container throughput in 2020 than the record in 2019 while all the countries exhibited a winding record of liner connectivity between the last quarter of 2019 through the last quarter of 2020.\u0000The study concluded that the disruption of maritime activity by the COVID-19 pandemic had a mixed impact on African countries’ performance. However, Africa has the potential to be more resilient to unforeseen shocks and become competitive if it is more integrated into the global supply chain and deploys modern and efficient technology and innovation to the shipping business more than it ever did.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46631903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Navigational safety assessment based on Markov-Model approach","authors":"O. Melnyk, S. Onyshchenko","doi":"10.31217/p.36.2.16","DOIUrl":"https://doi.org/10.31217/p.36.2.16","url":null,"abstract":"Safety analysis of complex technical systems currently operating in the transport sector is an urgent challenge for the global maritime industry, which suffers from a lack of information about the levels of risk and the consequences of their incorrect assessment. Among the requirements for vessel management and operations the importance of having a highly professional crew and up-to-date navigational equipment. Navigational safety is one of the components of the integral concept of “safety” for a seagoing ship. Assessment of integral safety is based on assessments of the individual safety components. In this study, the focus is on “navigational safety”, which is primarily understood as ensuring safe operation of a vessel in specific navigation conditions, ensuring safe control and maneuvering of the vessel, ship position monitoring, heading control, sufficient depth margin under the keel along the route, taking into account its actual draft and subsidence in shallow water, and sea disturbance. In the offered research on the basis of the identified states of navigational safety, the graphic model of process and matrix of transition probabilities in the general form with use of homogeneous Markov model of change of navigational safety of a vessel, with discrete time and presence of absorbing state is formed. The proposed Markov process model can be used to assess vessel navigational safety when establishing possible states of navigational safety with significant probability to assess ship safety and make decisions to ensure safe vessel operation.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46791419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Risk assessment of the extraordinary pollution in the Adriatic Sea as an economically important area for the Republic of Croatia","authors":"Teo Malnar, Đani Šabalja, M. Đorđević, Pavao Komadina","doi":"10.31217/p.36.2.4","DOIUrl":"https://doi.org/10.31217/p.36.2.4","url":null,"abstract":"Risk assessment links the likelihood of adverse events occurring to their consequences. Such assessment is used in labour management and trade-off determination to identify the safety and impacts associated with a particular interest. In the maritime sector, it is mainly used to raise safety standards, prevent pollution, and maintain a healthy marine ecosystem. Risk control itself is traditionally focused on the relationships between individual actions and consequences, which are later considered in groups to assess their acceptability in accordance with safety requirements. Therefore, the risk assessment for the extraordinary pollution of the Adriatic Sea as an economically important area for the Republic of Croatia are described in this paper. First, the area of analysis is defined, and a meteorological description of the eastern Adriatic coast is provided. The risk assessment is carried out in three steps. The first step is a description of waterways, and the analysis of traffic density, regulations, and types of vessels in individual areas. The second step is a detailed analysis of statistical data on accidents in the Adriatic Sea. Finally, the most probable and the most undesirable extraordinary pollution events and their impact on the Croatian economy are analysed. In addition, examples and procedures for determining risk acceptability and its control in a part of the Croatian coast are presented.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44986834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Legal framework on pilotage in Croatia with special regard to 2021 amendments to the Ordinance on Sea pilotage","authors":"Petra Amižić Jelovčić","doi":"10.31217/p.36.2.21","DOIUrl":"https://doi.org/10.31217/p.36.2.21","url":null,"abstract":"Sea Pilotage in Croatia is regulated by the Croatian Maritime Code and the Ordinance on Sea pilotage. The Croatian Maritime Code contains general provisions on pilotage and defines non-compulsory pilotage, while the Ordinance on Sea pilotage determines what should be considered compulsory pilotage but also comprises provisions on pilotage company, pilots and Pilotage Exemption Certificate. Both of these legislations have been amended lately in order to align policies among themselves and with international and/or EU requirements. This paper gives an overview of contemporary legal framework of maritime pilotage in Croatia with a special reference to 2021 Amendments to the Ordinance. By using descriptive, comparative and compiling research method, the author analyzes the most important changes introduced by these amendments with the purpose to establish the level of alignment of relevant regulations as well as to assess if current provisions represent appropriate legal solutions of this important maritime institute.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41523513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}