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Wyświetlanie 1-3 z 3
Tytuł:
A concept explanation on the development of wheel over point mathematical model for efficient course alteration
Autorzy:
Kamis, A. S.
Ahmad Fuad, A. F.
Powiązania:
https://bibliotekanauki.pl/articles/2063988.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
wheel over point
IBM SPSS
ECDIS
efficient course alteration
mathematical model
altering of the course
Mann-Whitney U Test
Opis:
This concept paper described the process of bridging the gaps in one of the methods for determining wheel over point (WOP). WOP is a marking made on charted courses to indicate a point at which a ship should change course. Identifying WOP is vital to avoid the vessel overshooting the planned track. One method for determining WOP is the advanced transfer technique. However, two issues were identified while reviewing this technique. Therefore, an improved mathematical model could be developed to overcome these problems. A manoeuvring analysis using a ship simulator will be performed to test the developed mathematical model's efficacy. The data obtained from the simulation study can be validated further by its adherence to the cross track limit, reduction in percentage change, and using IBM SPSS for the Mann-Whitney U test. The developed mathematical model is expectantly capable of producing a better track-keeping function and suitable for use onboard a cargo ship. The mathematical model also could be implemented as an algorithm in the Electronic Chart Display and Information System to help navigators make more efficient course changes.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 795--798
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Swedish Seafarers’ Commitment to Work in Times of Flagging out
Autorzy:
Hult, C.
Snöberg, J.
Powiązania:
https://bibliotekanauki.pl/articles/116389.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Seafarers
Swedish
Time of Flagging Out
Seafarers’ Motivation
Statistical Analyse
Organizational Commitment
Occupational Commitment
Statistical Package Social Science (SPSS)
Opis:
This study takes its departure in the difficulties to recruit and retain qualified senior seafarers in the Swedish shipping sector. The study focus is on seafarers’ motivation at work for the specific shipping company (organizational commitment), and seafarers’ motivation towards their occupation (occupational commitment), in times of flagging out. It was hypothesized that the youngest seafarers and the oldest may be most sensitive to foreign registration of ships. Statistical analyses were employed, using a survey material of 1,309 Swedish seafarers randomly collected in 2010 from a national register of seafarers. The results of the analyses show that flagging-out imposes a significant decline in organizational commitment for all seafarers. This decline is related to the perception of the social composition of crew. In addition, the oldest seafarers (age 55+) demonstrate diminished occupational commitment under a foreign flag. This decline is related to the degree of satisfaction with the social security structure. Occupational commitment among the youngest seafarers (age 19-30) is not affected by the nationality of flag. However, this type of commitment is decreasing by the time served on the same ship. This effect is partly related to a decline in satisfaction with the work content. In the concluding discussion, the findings are discussed in more details and recommendations are put forward.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 121-128
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 comparison study between advance transfer technique and advance transfer mathematical model using bulk carrier ship: cross-track distance validation by percentage change and mann whitney u test
Autorzy:
Kamis, A. S.
Ahmad Fuad, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/2211981.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
bulk carriers
coss-track distance
ECDIS
wheel over point
advanced transfer technique
advance transfer mathematical model
wilcoxon-mann whitney u tes
IBM SPSS
Opis:
One of the methods of efficient course alteration is through the accurate identification of the WOP by ATT. ATT is widely used by mariners worldwide, and recently, the technique has been restructured and enhanced into ATMM. To prove the efficacy of ATMM over ATT, a few types of ships have been used to carry out the manoeuvring analysis. This study extends the analysis by using a bulk carrier ship. A ship simulator was used for a manoeuvring simulation study, which was carried out to verify the differences between these two methods. Throughout the manoeuvring simulation study, XTD data for each simulation was monitored and verified by XTL compliance, percentage variation, and the Wilcoxon-Mann Whitney U Test via IBM SPSS. It was found that the ATMM can produce a significantly improved WOP compared to ATT and is suitable to be used onboard a bulk carrier ship. This research's finding is expected to contribute as evidence to strengthen ATMM's efficiency so that it can be accepted as an ECDIS algorithm for ship navigation.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 3; 541--551
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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