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Safe vessel operations – the tacit knowledge of navigators

Dreyer L. O.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2023

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Vol. 17 No. 3

579--586

EN

The collision regulations include several qualitative terms without providing guidance as to how these terms could be understood in quantitative terms. These terms must therefore be interpreted by navigators, which poses a problem for autonomous ships. Extend the knowledge of how navigators interpret the collision regulations, with a specific focus on how they interpret the rule covering the requirement to proceed at a safe speed. Qualitative study based on interviews of a convenience sample of eight Norwegian navigators. Data was analysed with systematic text condensation. Navigators characterise safe speed as a speed in which they have control. Navigators do not look at different factors mentioned in the collision regulations in isolation, but within the context of the situation. Determining the safe speed of a vessel is more complicated than made out in the literature. As autonomous ships will have to cooperate with conventional vessels, their programming must include the knowledge of how the collision regulations are interpreted by human navigators.

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Expert as interviewer – methodological challenges in use of qualitative interviews in maritime research

Sharma D. R.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2023

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Vol. 17 No. 3

638--642

EN

Interviews are a widely used method in maritime research using qualitative methodologies. Expert interviews are conducted with people who have special knowledge because of their professional position. The status of the interviewer when using expert interviews brings forth certain distinct nuances due to the specific nature of the interview methodology and epistemological considerations. A renowned and senior maritime specialist or a veteran maritime professional researching the nuances of their own field encounter methodological challenges while interviewing other experts during data collection. The paper aims to examine the impact on qualitative data collected in interviews when the interviewers themselves are experts in the field of research. The concepts from the social science research from various disciplines have been examined and discussed highlighting the methodological challenges.

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Ocena ryzyka robót dodatkowych w budowie infrastruktury kolejowej

Leśniak Agnieszka, Janowiec Filip

Materiały Budowlane

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2022

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nr 10

68--70

PL

Artykuł prezentuje autorskie podejście do oceny ryzyka robót dodatkowych w przedsięwzięciach kolejowych. Opracowana baza danych posłużyła do budowy i kalibracji modelu w postaci sieci bayesowskiej. Zdefiniowano kluczowe zdarzenia dotyczące robót dodatkowych. W przypadku każdego z nich określono warianty w węzłach sieci i prawdopodobieństwo ich wystąpienia. Zaproponowano 3 poziomy ryzyka. Przekroczenie przyjętego poziomu referencyjnego oznacza ryzyko nieakceptowalne i wymaga podjęcia działań zapobiegawczych.

EN

This article presents a proprietary approach to the risk assessment of additional works in the railway construction projects. The developed database was used to build and calibrate the model as a Bayesian network. The key events causing additional works were defined. Variants in nodes of network and probability of occurrence were determined for each of them. Three levels of risk were proposed. Exceeding the defined reference level means an unacceptable risk and requires taking preventive actions.