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Tytuł:
Classification of parametric rolling for seagoing ships and percentage distribution for multiple sea state parameters
Autorzy:
Chhoeung, S.
Hahn, A.
Powiązania:
https://bibliotekanauki.pl/articles/24201396.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
seagoing ship
rolling
sea state
sea state parameters
multiple sea state parameters
MARIN
parametric rolling
Artificial Intelligence
Opis:
In this paper, parametric rolling is divided into 5 heavy grades, establishing a classification for parametric rolling. This is achieved by a multi-parameter application in the simulations. For this purpose, parametric rolling, established criteria and the state of the art are considered and the results are summarized. Based on this, parametric rolling is successfully simulated using discrete simulation in MARIN [1]. Five heavy grades are introduced so different classes of parametric rolling can be distinguished. Furthermore, dependencies and probabilities for the occurrence of parametric roles in relation to the see are determined numerically. This will later be used in an assistance system on board ships to compute the prediction of parametric roll using an AI.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 4; 769--777
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trajectory Planning with Negotiation for Maritime Collision Avoidance
Autorzy:
Hornauer, S.
Hahn, A.
Blaich, M.
Reuter, J.
Powiązania:
https://bibliotekanauki.pl/articles/116268.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Trajectory Planning
Negotiation
route planning
Collision Avoidance
vessel traffic service (VTS)
Expert Knowledge
COLREGs
Opis:
The problem of vessel collisions or near-collision situations on sea, often caused by human error due to incomplete or overwhelming information, is becoming more and more important with rising maritime traffic. Approaches to supply navigators and Vessel Traffic Services with expert knowledge and suggest trajectories for all vessels to avoid collisions, are often aimed at situations where a single planner guides all vessels with perfect information. In contrast, we suggest a two-part procedure which plans trajectories using a specialised A* and negotiates trajectories until a solution is found, which is acceptable for all vessels. The solution obeys collision avoidance rules, includes a dynamic model of all vessels and negotiates trajectories to optimise globally without a global planner and extensive information disclosure. The procedure combines all components necessary to solve a multi-vessel encounter and is tested currently in simulation and on several test beds. The first results show a fast converging optimisation process which after a few negotiation rounds already produce feasible, collision free trajectories.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 3; 335-341
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Virtual test bed for maritime safety assessment
Autorzy:
Hahn, A.
Gollücke, V.
Buschmann, C.
Schweigert, S.
Powiązania:
https://bibliotekanauki.pl/articles/135126.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
virtual test bed
co-simulation
e-Navigation
maritime traffic simulation
safety assessment
sensor simulation
hardware in the loop
software in the loop
model in the loop
Opis:
“Safe voyage from berth to berth”: This is the goal of all e-Navigation strains driven by new technologies, new infrastructures, and new organizational structures on bridge, on shore, as well as in the cloud. To facilitate these efforts suitable engineering and safety/risk assessment methods are required. Understanding maritime transportation as a sociotechnical system allows the usage of system-engineering methods. Simulation-based test beds for verification and validation (V +V) of e-Navigation technologies are important methods to obtain functional safety and reliability. The modeling and simulation toolset HAGGIS is a cosimulation system for the evaluation of e-Navigation concepts and systems. It provides a maritime traffic simulator and a physical world (n-body) simulator and services for finding rare events of failures. HAGGIS is accompanied by the physical test bed LABSKAUS, which implements a reference port and waterways. This paper describes an integrated and seamless approach for developing new e-Navigation technologies starting with virtual simulation-based safety assessment and ending in physical real-world demonstrations. It gives an overview of the actual test bed and introduces requirements, concepts and elements of HAGGIS and LABSKAUS, which are joined in the e-Maritime Integrated Reference Platform (eMIR) test bed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 116-122
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving maritime traffic safety by applying routes exchange and automatic relevant radar data exchange
Autorzy:
Salous, M.
Müller, H.
Bolles, A.
Hahn, A.
Powiązania:
https://bibliotekanauki.pl/articles/135291.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
e-navigation strategy
maritime traffic
automated data exchange
Human Machine Interfaces
navigation systems
potential collisions
Opis:
The e-navigation strategy of the International Maritime Organization (IMO) aims to improve the safety of maritime traffic by increasing cooperation between several maritime stakeholders. The COSINUS (Bolles et al., 2014) project contributes to such a strategy by enabling an automated data exchange (observations, routes and maneuver plans) between ship-side and shore-side navigational systems, developing useful sensor fusion applications upon the new information available from data exchange and introducing new Human Machine Interfaces (HMIs) to support the users of navigation systems. The project shows potential for improvement in maritime traffic safety by ensuring continuous awareness to all participants involved through sensor fusion applications, i.e. by providing all participants (mobile and stationary navigation systems) with a complete view at all times. These applications include detection of critical situations like radar shadowing areas, early and accurate prediction of potential collisions or closest point of approach (CPA) based on the exchanged routes, and improving the accuracy of radars by ensuring high quality data for obstructed or far away routes. The new HMI concepts introduced within the COSINUS project aim at highlighting critical maritime traffic situations. Thus, the users of such navigation systems supported with COSINUS facilities can easily detect such critical situations and react efficiently to avoid collisions, possible crowded areas and inefficient routes.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 90-98
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter identification of ship maneuvering models using recursive least square method based on support vector machines
Autorzy:
Zhu, M.
Hahn, A.
Wen, Y.
Bolles, A.
Powiązania:
https://bibliotekanauki.pl/articles/116455.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ship manoeuvering
recursive least square method
ship manoeuvering model
ship maneuverability prediction
Support Vector Machines (SVM)
empirical mode decomposition (EMD)
Computational Fluid Dynamics (CFD)
Extended Kalman Filter (EKF)
Opis:
Determination of ship maneuvering models is a tough task of ship maneuverability prediction. Among several prime approaches of estimating ship maneuvering models, system identification combined with the full-scale or free- running model test is preferred. In this contribution, real-time system identification programs using recursive identification method, such as the recursive least square method (RLS), are exerted for on-line identification of ship maneuvering models. However, this method seriously depends on the objects of study and initial values of identified parameters. To overcome this, an intelligent technology, i.e., support vector machines (SVM), is firstly used to estimate initial values of the identified parameters with finite samples. As real measured motion data of the Mariner class ship always involve noise from sensors and external disturbances, the zigzag simulation test data include a substantial quantity of Gaussian white noise. Wavelet method and empirical mode decomposition (EMD) are used to filter the data corrupted by noise, respectively. The choice of the sample number for SVM to decide initial values of identified parameters is extensively discussed and analyzed. With de-noised motion data as input-output training samples, parameters of ship maneuvering models are estimated using RLS and SVM-RLS, respectively. The comparison between identification results and true values of parameters demonstrates that both the identified ship maneuvering models from RLS and SVM-RLS have reasonable agreements with simulated motions of the ship, and the increment of the sample for SVM positively affects the identification results. Furthermore, SVM-RLS using data de-noised by EMD shows the highest accuracy and best convergence.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 23-29
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobile bridge - a portable design siimulator for ship bridge interfaces
Autorzy:
Stratmann, T.C.
Gruenefeld, U.
Hahn, A.
Boll, S.
Stratmann, J.
Schweigert, S.
Powiązania:
https://bibliotekanauki.pl/articles/116133.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
mobile bridge
navigational bridge
portable design simulator
ship bridge interfaces
naviBox
e-navigation
modern navigational bridge
bridge elements
Opis:
Developing new software components for ship bridges is challenging. Mostly due to high costs of testing these components in realistic environments. To reduce these costs the development process is divided into different stages. Whereas, the final test on a real ship bridge is the last step in this process. However, by dividing the development process into different stages new components have to be adapted to each stage individually. To improve the process we propose a mobile ship bridge system to fully support the development process from lab studies to tests in realistic environments. Our system allows developing new software components in the lab and setting it up on a ship bridge without interfering with the vesselʹs navigational systems. Therefore it is linked to a NaviBox to get necessary information such as GPS, AIS, compass, and radar information. Our system is embedded in LABSKAUS, a test bed for the safety assessment of new e‐Navigation systems.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 763-768
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on Container Ship Berthing from the Pilot’s Perspective: Accident Analysis, Ethnographic Study, and Online Survey
Autorzy:
Gruenefeld, U.
Stratmann, T.C.
Brueck, Y.
Hahn, A.
Boll, S.
Heuten, W.
Powiązania:
https://bibliotekanauki.pl/articles/116358.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
container ship
ship berthing
pilot’s perspective
accident analysis
ethnographic study
online survey
port operations
Port of Hamburg
Opis:
In recent years, container ships have had to transport more and more goods due to constantly growing demand. Therefore, the container ships for carrying these goods are growing in size, while the harbors fall short in adapting to these changes. As a result, the berthing of these container ships in harbors has become more challenging for harbor pilots. In this work, we identify problems and risks with which pilots are confronted during the berthing process. First, we analyzed approximately 1500 accident reports from six different transportation safety authorities and identified their major causes. Second, we conducted an ethnographic study with harbor pilots in Hamburg to observe their actions. Third, we gained more specific insights on pilots environments and communications through an online survey of 30 harbor pilots from different European countries. We conclude our work with recommendations on how to reduce problems and risks during berthing of container vessels.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 493-498
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sandwich type Hahn-Banach theorem for convex and concave functionals
Autorzy:
Xu, Jingshi
Powiązania:
https://bibliotekanauki.pl/articles/2052376.pdf
Data publikacji:
2021
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
Hahn-Banach theorem
convex functional
concave functional
twierdzenie Hahna-Banacha
funkcja wypukła
funkcja wklęsła
Opis:
We give a sandwich type Hahn-Banach theorem for convex and concave functionals.
Źródło:
Journal of Mathematics and Applications; 2021, 44; 119-122
1733-6775
2300-9926
Pojawia się w:
Journal of Mathematics and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A generalization of the Hahn-Banach theorem
Autorzy:
Plewnia, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/1311891.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
the Hahn-Banach theorem
convex functions
Opis:
If C is a non-empty convex subset of a real linear space E, p: E → ℝ is a sublinear function and f:C → ℝ is concave and such that f ≤ p on C, then there exists a linear function g:E → ℝ such that g ≤ p on E and f ≤ g on C. In this result of Hirano, Komiya and Takahashi we replace the sublinearity of p by convexity.
Źródło:
Annales Polonici Mathematici; 1993, 58, 1; 47-51
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A theorem of the Hahn-Banach type and its applications
Autorzy:
Gajda, Zbigniew
Smajdor, Andrzej
Smajdor, Wilhelmina
Powiązania:
https://bibliotekanauki.pl/articles/1311972.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Hahn-Banach theorem
additive selection
subadditive set-valued function
binary intersection property
stability of functional equations
Opis:
Let Y be a subgroup of an abelian group X and let T be a given collection of subsets of a linear space E over the rationals. Moreover, suppose that F is a subadditive set-valued function defined on X with values in T. We establish some conditions under which every additive selection of the restriction of F to Y can be extended to an additive selection of F. We also present some applications of results of this type to the stability of functional equations.
Źródło:
Annales Polonici Mathematici; 1992, 57, 3; 243-252
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sail training a wychowanie morskie
Autorzy:
Agnieszka, Leśny,
Powiązania:
https://bibliotekanauki.pl/articles/892168.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
maritime education
sail training
Class Afloat
Blue School
Kurt Hahn
Opis:
The article is inspired by a theoretical and practical discussion on whether the Polish concept of civil maritime education is equal to global sail training movement which took place during the conference “Education and Adventure”, which took place on 16th–17th October 2014 in Jedlnia Letnisko, Poland. I describe the origins of sail training movement and three most characteristic Polish projects: Class Afloat of Krzysztof Baranowski; Blue School and Class Afloat of Education Under Sails Association in the context of sail training and civil maritime education as a theoretical voice in Polish discussion.
Źródło:
Kwartalnik Pedagogiczny; 2016, 61(2 (240)); 134-159
0023-5938
Pojawia się w:
Kwartalnik Pedagogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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