• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2003.05a
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• pp.257-264
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• 2003

The international oil majors have been reducing the size of their own oil tanker fleet since from the beginning of 1980s. Like international oil majors, the Korean refineries are getting more dependent on tanker chartering than tanker ownership for their oil transportation since 1990s. They also prefer spot charter to time charter and this kind of trend continue up to today. Consequently, this paper attempted to find out factors influencing changes in tanker fleet composition. To attain the object, a empirical study is adopted using the ten decision making factors derived from the preceeding study. The findings are that MARPOL and OPA 90, and transportation cost are the most important factors influencing on oil tanker fleet composition.

• Journal of Navigation and Port Research
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• v.39 no.6
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• pp.439-450
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• 2015

This study objects to find characteristics in chemical tanker markets and to determine optimal chemical tanker size using a total shipping cost in main trading route of asia chemical tankers .Precedent studies of determination of the optimal ship size and case studies about chemical tankers was carried out and tried to introduce a cost model which is applicable to chemical tanker. This study is dependant on numerical analysis and involves scenario analysis to minimize sensitivity of results. This analysis shows as follows. First, 12,000DWT tanker is an optimal size on the 'Far East-Middle East' services, 9,000DWT tanker is a most competitive on the 'Far East-South East Asia' services and 3,000DWT tanker is a most economic size on the 'Inner Far East' services at average market situation. Second, the bigger size of chemical tanker, the more competitive advantage the tanker will obtain when bunker fuel prices rise. Small size ship gets more competitive during bunker prices down. Third, market fluctuation of time charter rate for chemical tanker is less than 20% against its average time charter hire which means less volatile. And tanker's competitiveness per each size is remained mostly same when time charterer rates rise at same proportion. Fourth, bigger size chemical tankers have cost advantages when tanker's quantity of each part cargo increase. And small-sized tanks are more competitive when part cargo scales decrease. For the last, ship's port stay strongly influences on the determination of the optical tanker size. When vessel has shorter port stay, bigger-sized tanker will be more competitive and even can be competitive if applies in short voyage as well.

• Journal of Navigation and Port Research
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• v.26 no.4
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• pp.373-381
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• 2002

There has been an interesting trend showing that the number of tankers owned by major oil company has been decreasing since the 1980s, while the number of tankers chartered by them is increasing. So do Korea oil refineries in the period 1990s. Therefore, the following question is raised： Why have oil refinery companies, national and international, been much more dependent upon chartered ships than their owned ships since 1980s\ulcorner This paper tried to answer the above question. In so, doing ten decision-making factors for fleet composition of oil tankers are drawn through literature survey on the research topic with questionnaires and interviews to the four big Korean oil refineries.

• Journal of the Society of Naval Architects of Korea
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• v.39 no.4
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• pp.24-31
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• 2002

In the present study, the amount of slow drift motion damping of shuttle tanker in still water and various environments is measured through free decay model test. Although the estimation of slow drift damping is essential in analysing slow drift motion of moored FPSO or DP controlled shuttle tanker, it is difficult to predict damping accurately by theoretical analysis. The estimation of drift damping depends on model test mostly. Through the model test, the amount of slow drift damping is measured and the effects of environments and thruster action on drift damping are investigated. The measured damping characteristics are expected to be used in the analysis on slow drift motion of moored vessel.

• Korea Petroleum Association Journal
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• no.9 s.67
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• pp.104-107
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• 1986

• 해운
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• no.3 s.26
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• pp.43-43
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• 2006

• 해운
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• no.9 s.20
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• pp.35-35
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• 2005

• Korea Petroleum Association Journal
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• no.5 s.15
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• pp.62-65
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• 1982

• 해운
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• no.7 s.6
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• pp.44-48
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• 2004

• Korea Petroleum Association Journal
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• no.1 s.167
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• pp.100-109
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• 1995