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    Wyświetlanie 1-6 z 6
    Tytuł:
    Optimization model to manage ship fuel consumption and navigation time
    Autorzy:
    Rudzki, Krzysztof
    Gomulka, Piotr
    Hoang, Anh Tuan
    Powiązania:
    https://bibliotekanauki.pl/articles/32912851.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    expert system
    optimization model
    ship fuel consumption
    time of navigation
    Opis:
    Owners of vessels are interested in the lowest possible operating costs. These costs are mainly related to fuel consumption during navigation. To manage it rationally, the main decision-making problem is selecting the proper parameters of the ship’s propulsion system during navigation. In practice, operators of ships equipped with controllable pitch propellers controlled in manual mode make a selection of the commanded outputs based on their own knowledge, intuition, and all accessible information regarding sea conditions. In many cases, their decisions are unreasonable or incorrect. Therefore, it would be desirable to support their decision-making in selecting the commanded outputs. For this reason, we have decided to develop a decision support system in the form of an expert system. This computer-aided system supports the selection of the commanded outputs of the ship’s propulsion system. The most important component of this system is the two-criteria optimization model, allowing the rational management of the ship fuel consumption and navigation time.
    Źródło:
    Polish Maritime Research; 2022, 3; 141-153
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strategies for developing logistics centres: technological trends and policy implications
    Autorzy:
    Nguyen, Minh Duc
    Ko, Tae Yeon
    Rudzki, Krzysztof
    Nguyen, Hoang Phuong
    Pham, Nguyen Dang Khoa
    Powiązania:
    https://bibliotekanauki.pl/articles/34601208.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    logistics centers
    logistics infrastructure
    logistical services
    smart technologies
    Opis:
    Logistics centres are currently performing a key function in the development of countries through their ability to regulate goods, markets, and transport. This is shown by the infrastructure, cost, goods flow, and quality of logistical services provided by these centres. Nevertheless, in developing nations or regions with antiquated logistics infrastructure, conventional logistics centres seem to struggle to manage the volume of commodities passing through them, resulting in persistent congestion and an unsteady flow of goods inside these facilities. This issue poses a challenge to the progress of any nation. The emergence of new technology offers a potential avenue to solve the problems inherent in traditional logistics centres. Most prominently, four technologies (the Internet of Things (IoT), Blockchain, Big Data and Cloud computing) are widely applied in traditional logistics centres. This work has conducted a thorough analysis and evaluation of these new technologies in relation to their respective functions and roles inside a logistics centre. Furthermore, this work proposes difficulties in applying new technologies to logistics centres related to issues such as science, energy, cost, or staff qualifications. Finally, future development directions, related to expanding policies in technological applications, or combining each country’s policies for the logistics industry, are carefully discussed.
    Źródło:
    Polish Maritime Research; 2023, 4; 129-147
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Understanding fuel saving and clean fuel strategies towards green maritime
    Autorzy:
    Van Nhanh, Nguyen
    Rudzki, Krzysztof
    Dzida, Marek
    Pham, Nguyen Dang Khoa
    Pham, Minh Tuan
    Nguyen, Phuoc Quy Phong
    Nguyen, Xuan Phuong
    Powiązania:
    https://bibliotekanauki.pl/articles/32919438.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine engine
    alternative fuel
    green maritime
    fuel savings
    low-carbon strategy
    Opis:
    Due to recent emission-associated regulations imposed on marine fuel, ship owners have been forced to seek alternate fuels, in order to meet the new limits. The aim of achieving low-carbon shipping by the year 2050, has meant that alternative marine fuels, as well as various technological and operational initiatives, need to be taken into account. This article evaluates and examines recent clean fuels and novel clean technologies for vessels. The alternative fuels are classified as low-carbon fuels, carbon-free fuels, and carbon neutral fuels, based on their properties. Fuel properties, the status of technological development, and existing challenges are also summarised in this paper. Furthermore, researchers have also investigated energy-saving devices and discovered that zero-carbon and virtually zero-carbon clean fuels, together with clean production, might play an important part in shipping, despite the commercial impracticability of existing costs and infrastructure. More interestingly, the transition to marine fuel is known to be a lengthy process; thus, early consensus-building, as well as action-adoption, in the maritime community is critical for meeting the expectations and aims of sustainable marine transportation.
    Źródło:
    Polish Maritime Research; 2023, 2; 146-164
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Management strategy for seaports aspiring to green logistical goals of IMO: technology and policy solutions
    Autorzy:
    Le, Thanh Tuan
    Nguyen, Hoang Phuong
    Rudzki, Krzysztof
    Rowiński, Lech
    Bui, Viet Duc
    Truong, Thanh Hai
    Le, Huu Cuong
    Pham, Nguyen Dang Khoa
    Powiązania:
    https://bibliotekanauki.pl/articles/34605109.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    green seaport
    management strategy
    clean energy
    decarbonization
    sustainable Maritime
    Opis:
    Recently, because of serious global challenges including the consumption of energy and climate change, there has been an increase in interest in the environmental effect of port operations and expansion. More interestingly, a strategic tendency in seaport advancement has been to manage the seaport system using a model which balances environmental volatility and economic development demands. An energy efficient management system is regarded as being vital for meeting the strict rules aimed at reducing the environmental pollution caused by port facility activities. Moreover, the enhanced supervision of port system operating methods and technical resolutions for energy utilisation also raise significant issues. In addition, low-carbon ports, as well as green port models, are becoming increasingly popular in seafaring nations. This study comprises a comprehensive assessment of operational methods, cutting-edge technologies for sustainable generation, storage, and transformation of energy, as well as systems of smart grid management, to develop a green seaport system, obtaining optimum operational efficiency and environmental protection. It is thought that using a holistic method and adaptive management, based on a framework of sustainable and green energy, could stimulate creative thinking, consensus building, and cooperation, as well as streamline the regulatory demands associated with port energy management. Although several aspects of sustainability and green energy could increase initial expenditure, they might result in significant life cycle savings due to decreased consumption of energy and output of emissions, as well as reduced operational and maintenance expenses.
    Źródło:
    Polish Maritime Research; 2023, 2; 165-187
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimisation of the topping-up process of lubricating oil in medium-speed marine engines
    Autorzy:
    Młynarczak, Andrzej
    Krzysztof, Rudzki
    Powiązania:
    https://bibliotekanauki.pl/articles/1573592.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    multi-objective optimisation
    medium-speed marine engine
    lubricating oil
    soild impurities
    alkalinity
    topping-up process
    Opis:
    In this paper, we examine the problem of optimising the process of topping up lubricating oil in medium-speed marine engines. This process is one of the methods that can be applied to improve the properties of lubricating oil. The amount of fresh oil added to lubricating oil system always balances its consumption, but the method used to top up depends on the marine engineer. Small amounts of fresh oil can be added at short intervals, or large ones at long intervals, and the element of randomness often plays a significant role here. It would therefore be valuable to find a method that can help the mechanical engineer to choose the right strategy. We apply a multi-criteria optimisation method for this purpose, and assume that the criterion functions depend on the concentration of solid impurities and the alkalinity, which are among the most important aspects of the quality and properties of lubricating oil. These criterion functions form the basis for multi-objective optimisation carried out with the use of the MATLAB computer program.
    Źródło:
    Polish Maritime Research; 2021, 2; 78-84
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of factors associated with the nutritional mixture leading to liver complications in patients treated by means of parenteral nutrition at home
    Autorzy:
    Matras, Przemysław
    Żuchowska, Katarzyna
    Banakiewicz, Katarzyna
    Bobak, Adam
    Jajko, Krzysztof
    Szypowski, Roman
    Zalewski, Grzegorz
    Zieliński, Paweł
    Rudzki, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/1396531.pdf
    Data publikacji:
    2013-12-01
    Wydawca:
    Index Copernicus International
    Tematy:
    hepato-billiary complications
    long-term parenteral nutrition
    Opis:
    The major problem of total parenteral treatment consists in the balancing of the source and dose of the nutritional mixture, so as to not deepen malnutrition with a positive impact on the patients’ organism. The aim of the study was to evaluate selected factors that induce hepato-billiary complications in patients treated by means of parenteral nutrition at home. Material and methods. The retrospective study comprised 70 patients with biochemistry performed every three months. Considering statistical analysis patients were allocated to four groups, depending on the period of treatment. Group A analysis results were based on the activity of aminotransferases, group B on the activity of bilirubin. Both groups A and B were additionally divided into group I where we assigned normal values of control lab results, and group II with improper results after treatment. Results. Differences between groups Ia vs IIa were presented on the basis of the daily supply of glucose: mean- 2.52 vs 3.49 g/kg (p=0.000003), glucose/lipids ratio: mean- 3.76 vs 4.90 g/kg (p=0.0001), daily non-protein energy: mean- 16.73 vs 21.06 kcal/kg (p=0.0001). Differences between groups Ib vs IIb were presented on the basis of the daily supply of glucose: mean- 2.76 vs 3.46 g/kg (p=0.0007), glucose/lipids ratio: mean- 3.98 vs 5.13 g/kg (p=0.01), daily non-protein energy: mean-17.96 vs 20.36 kcal/kg (p=0.04). Based on the above-mentioned analysis the main goal in the prevention of hepatic complications should lead to the reduction of the dose of glucose. Increased glucose supply leads to increased number of hepato-billiary complications. Conclusions. Based on obtained results we were able to conclude that in case of liver complications associated with parenteral nutrition, proper management consists in the modification of nutritional mixtures (reduction in the daily glucose supply and change in the proportions of extra-protein energy). Such management has the greatest clinical effect. When determining the composition of the nutritional mixture one should adjust the glucose supply, so as to offset both sources of extra-protein energy
    Źródło:
    Polish Journal of Surgery; 2013, 85, 12; 681-686
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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