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Wyświetlanie 1-15 z 28
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:
Development of a method and technology for the production of 3D knitted reinforcement grids
Autorzy:
Zierold, Konrad
Steinberg, Julius
Hahn, Lars
Rittner, Steffen
Friese, Danny
Cherif, Chokri
Powiązania:
https://bibliotekanauki.pl/articles/2171997.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
composite
multiaxial warp knitting
multi-curved surface
Opis:
The use of fibre-reinforced plastic composites (FRP) for lightweight construction solutions is becoming increasingly important. The processing of 2D scrims into complete 3D FRP components has been carried out with the help of complex manual assembly steps. The disadvantages of this procedure are distortions in the textile and, thus, deviations in the fibre alignments from the calculated load path. This paper presents a newly developed basic technology for the production of 3D reinforcing grids with variable warp and weft yarn section lengths based on multiaxial warp knitting technology. For this purpose, a new type of machine module and associated control technology for the production of weft yarn reserves on a multiaxial warp knitting machine was developed. In combination with technology from previous research work on the production of warp yarn lengths suitable for component contours, a basis was created for the production of 3D reinforcing grids.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 3 (151); 18--26
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
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:
Determination of optimised pick-up and drop-off locations in transport routing - a cost distance approach
Autorzy:
Hahn, Armin
Frühling, Wiard
Schlüter, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2098094.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
routing
cost distance analysis
remote sensing
analiza kosztu dystansu
teledetekcja
Opis:
With the emergence of dynamic passenger transport systems, such as demand-responsive transport (DRT) and ride-sharing without predetermined stop locations as used for static bus routes, accurate routing for these flexible door-to-door transport services is needed. Routing between two addresses requires the assignment of addresses to suitable, so-called snapping points as reference points on the road network. Therefore, many conventional routing machines use perpendicular distance to identify the nearest point on the road network. However, this technique tends to produce inaccurate results if the access to a building is not reachable from the road segment with the shortest perpendicular distance. We provide a novel approach to identify the access to buildings (paths) based on remote sensing data to obtain more reasonable stop locations for passenger transport. Multispectral images, OpenStreetMap data, and light detection and ranging (LiDAR) data were used to perform a cost distance analysis based on vegetation cover, building footprints, and the slope of the terrain to identify such optimised stop locations. We assumed that the access to buildings on the shortest route to the building’s entrance consists of little vegetation cover and minimal slope of the terrain; furthermore, the calculated path should not cross building footprints. Thus, snapping points on the road network can be determined based on the most likely path between a building and the road network. We validated our results based on a predetermined ideal snapping area considering different weightings for the parameters slope, vegetation, and building footprints. The results were compared with a conventional routing machine that uses perpendicular distance. This routing machine shows a validation rate of 81.4%, whereas the validation rate of our presented approach is as high as 90.3%. This new approach provides increased accuracy and better comfort for flexible passenger transport systems.
Źródło:
Transport Problems; 2021, 16, 1; 17--28
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A generalization of the Hahn-Banach theorem in seminormed quasilinear spaces
Autorzy:
Çakan, Sümeyye
Yılmaz, Yilmaz
Powiązania:
https://bibliotekanauki.pl/articles/357900.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
quasilinear spaces
normed quasilinear spaces
seminormed quasilinear spaces
semimetrizable quasilinear spaces
Hahn-Banach theorem
przestrzenie quasi-liniowe
przestrzenie quasi-unormowane
twierdzenie Hahna-Banacha
Opis:
The concept of normed quasilinear spaces which is a generalization of normed linear spaces gives us a new opportunity to study with a similar approach to classical functional analysis. In this study, we introduce the notion of seminormed quasilinear space as a generalization of normed quasilinear spaces and give various auxiliary results and examples. We present an analog of Hahn-Banach theorem, in seminormed quasilinear spaces.
Źródło:
Journal of Mathematics and Applications; 2019, 42; 79-94
1733-6775
2300-9926
Pojawia się w:
Journal of Mathematics and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology assessment in a globalized world
Autorzy:
Scherz, Constanze
Hahn, Julia
Ladikas, Miltos
Powiązania:
https://bibliotekanauki.pl/articles/410099.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
global TA
ethics
culture
technology assessment
Opis:
The interaction between science and policy is affected by increasingly dissolving boundaries whereby a number of issues arise, such as, what should political advice for national parliaments consist of in the face of global socio-technical developments? The Internet of Things in relation to Big Data resulting in enormously fast analysis of huge amounts of data, accelerates the dissolution of boundaries between science, society and policy at global level. This type of “globalization” raises questions that concern very diverse and intimate areas of life, ranging from food to health to work automation. How can access to science and technology in very different societal settings can be enabled, while also accounting for global developments? The article deals with the assumption that global effects of science and technology as well as global challenges lead to an urgent need to develop methodologies for analyzing and also shaping these developments. Under the umbrella term “Global Technology Assessment” (Global TA) it is argued that the problem-oriented, interdisciplinary methodology of technology assessment offers a promising frame to deal with cultural and ethical questions in relation to emerging technologies. This framework is needed in order to be able to develop meaningful national comparisons, but also in order to be able to approach the analysis of common future challenges on equal footing.
Źródło:
Management Systems in Production Engineering; 2019, 3 (27); 149-152
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie wytrzymałości na rozciąganie prętów kompozytowych na bazie włókien szklanych z siatek zbrojeniowych prefabrykowanych
Tensile strength testing of composite bars based on glass fibres from prefabricated reinforcing grids
Autorzy:
Rduch, A.
Rduch, Ł.
Pitas, M.
Kot, M.
Hahn, T.
Konopka, K.
Cybulski, R.
Walentyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/162408.pdf
Data publikacji:
2018
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
pręt zbrojeniowy
pręt kompozytowy
GFRP
siatka szklana
siatka prefabrykowana
wytrzymałość na rozciąganie
reinforcing bar
composite bar
glass fiber grid
prefabricated grid
tensile strength
Opis:
Artykuł przedstawia badania prętów zbrojeniowych kompozytowych na bazie włókien szklanych na rozciąganie oraz wyniki tych badań. Pręty zostały wycięte z siatek zbrojeniowych kompozytowych prefabrykowanych produkowanych przez polskiego producenta. Na podstawie badań stwierdzono, że pręty tego typu mają wytrzymałość na rozciąganie porównywalną ze stalą klasy AIIIN i o połowę niższą od klasycznych prętów kompozytowych wytwarzanych w procesie pultruzji.
The article presents tests of composite reinforcing steel bars based on glass fibres and the results of these tests. The bars were cut from prefabricated composite reinforcing grids produced by a Polish manufacturer. The tests revealed that this type of bars has a tensile strength comparable to that of AIIIN class steel and half lower than conventional composite bars produced in the pultrusion process.
Źródło:
Przegląd Budowlany; 2018, 89, 12; 37-40
0033-2038
Pojawia się w:
Przegląd Budowlany
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:
Mechanical Characterisation of Carbon Fibre-Reinforced Plastics with Defined Defects
Charakterystyka mechaniczna wzmocnionych włóknem węglowym tworzyw sztucznych wraz ze zdefiniowaniem defektów
Autorzy:
Ashir, M.
Bardl, G.
Hahn, L.
Nocke, A.
Cherif, C.
Powiązania:
https://bibliotekanauki.pl/articles/234248.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
carbon fibre-reinforced plastics
defects
mechanical characterisation
tworzywa sztuczne wzmocnione włóknami węglowymi
wady
charakterystyka mechaniczna
Opis:
A steadily increasing application of fibre-reinforced plastics in the field of lightweight construction has been observed in the course of the past two decades. Currently a major challenge in the growing high technology market is the quality assurance of manufactured fibre-reinforced plastic components. During different stages in the manufacturing process of fibre-reinforced plastics, defects of different types and sizes are enclosed in them, exerting a destructive influence on the performance of fibre-reinforced plastics in various practical applications in terms of strength, stiffness and brittleness. Thus the aim of this research project was to investigate the effect of defined local defects on the mechanical properties,such as tensile, flexural and impact properties, of fibre-reinforced plastics, in particular carbon fibre-reinforced plastics. Results show that these mechanical properties depend significantly on the type and size of defect.
W ciągu ostatnich dwóch dekad zaobserwowano stale rosnące zastosowanie w dziedzinie lekkich konstrukcji tworzyw sztucznych wzmocnionych włóknami. Obecnie dużym wyzwaniem na rosnącym rynku wysokich technologii jest wyprodukowanie wysokiej jakości komponentów z tworzyw sztucznych wzmocnionych włóknami. Podczas różnych etapów procesu wytwarzania tworzyw sztucznych wzmacnianych włóknami pojawiają się defekty różnego rodzaju i rozmiarów wywierające destrukcyjny wpływ na działanie tworzyw sztucznych wzmacnianych włóknami w różnych praktycznych zastosowaniach pod względem wytrzymałości, sztywności i kruchości. Celem pracy było zbadanie wpływu określonych defektów lokalnych na właściwości mechaniczne, takie jak właściwości rozciągające, zginające i uderzeniowe. Wyniki pokazały, że właściwości mechaniczne zależą w znacznym stopniu od rodzaju i rozmiaru defektu.
Źródło:
Fibres & Textiles in Eastern Europe; 2018, 6 (132); 126-132
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
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:
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:
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
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:
Scott W. Hahn, The Kingdom of God as Liturgical Empire. A Theological Commentary on 1-2 Chronicles (Grand Rapids, MI: Baker Academic, 2012). Ss. XI + 225. $ 26. ISBN 978-0-8010-3947-8
Autorzy:
Tronina, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1051483.pdf
Data publikacji:
2015-11-14
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Opis:
Recenzja
Book review
Źródło:
The Biblical Annals; 2014, 4, 2; 477-480
2083-2222
2451-2168
Pojawia się w:
The Biblical Annals
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
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