• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.29-31
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• 2012

사고선박을 예선(또는 예인선)을 이용하여 안전한 곳으로 이동시키기 위해서는 예인소요마력을 계산하여 예선의 척수를 결정해야 한다. 예선의 신속한 투입은 잠재적인 환경오염 및 사고선박의 2차적인 피해로의 확산을 예방할 수 있다. 하지만, 국내에는 아직까지 사고선박의 형태, 크기, 외력조건에 따라 지원되어야 할 예선의 척수 산정 및 최적의 배치방법에 대한 정량적이고 체계적인 결정 시스템이 없는 실정이다. 따라서 본 연구에서는 실선을 활용한 소요마력 측정을 위한 실험방법의 제시와 상황에 따른 예선의 다양한 배치에 따른 장력 측정 방법을 제시하고, 이러한 실험을 통하여 얻은 결과를 이론계산 결과와 비교 분석함으로써 추후 구축하게 될 사고선박 예인지원시스템 프로그램 개발을 위한 이론식을 정립하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.538-541
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• 2012

개항질서법은 2011년 6월 15일 개정되어 같은 해 9월 16일 발효되었다. 개정 개항질서법은 적용범위를 개항의 항계 안에서 항계 밖의 항로 및 정박지 등 수역시설까지 확대하였고, 또한 잡종선의 정의를 우선피항선으로 개정하고 우선피항선을 기존의 잡종선에 항내역무선을 포함시켜 정의하였다. 이 글은 우선피항선의 정의와 항법에 대해 살펴보고, 기존 해양안전심판원에서 재결한 해양사고 사례를 통해 개정 개항질서법의 내용과 비교, 검토하였으며, 우선피항선의 정의 및 항법에 대한 개정의견을 제시하고 있다.

• Journal of Navigation and Port Research
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• v.36 no.5
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• pp.339-347
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• 2012

After towing rope connecting a barge to a tug was subdivided into multiple finite elements, then those dynamic models was established using Newton's second law and considering the external force and moment such as tension, drag, Coriolis force, gravity, buoyancy, and impact due to free surface acting on each element. While the previous research on the model of towing rope considered only translation, five-degree-of-freedom equations of motion except roll based on the body-fixed frame were established in this paper. All elements are connected by a spring and a damper, and the stiffness of the spring was set as the equivalent value of the real rope. In order to confirm the established multiple finite element model, various scenarios such as freely falling of towing rope in the air and above the free surface, accelerating of a tug which tows a barge connected by towing rope, and sinusoidal moving of a tug were set up and simulated. As the results, the trajectories of the tug, the barge, and the towing rope showed good tendencies to the ones of real expected situations.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.6
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• pp.946-954
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• 2022

More than half of barges have been surveyed and designated as an "unmanned barge". The main advantage of the unmanned barge is that it can carry more cargo equivalent to 25 percent of freeboard compared to that of a manned barge. In contrast, it needs an onboard crew barge because the bargeman is in charge of several tasks during sailing such as mooring or unmooring barges to or from a wharf, dropping and heaving up an anchor and turning on and of navigational lights and shapes. The instant recognition is that a tug assume the responsibility of operating a barge; however, different situations exist in which the shipper, as the operator of the barge, hires a tug. Although a tug might be a carrier of a barge under a specific contract, the master of the tug should fulfill his duty to complete its voyage. Most masters are not provided with the particulars of a barge and the information regarding the bargemen onboard, which is believed not to respect the master's authority and lead to an unintended violation of relevant laws. This paper presents three recommendations for resolving these issues: the policy approach for changing unmanned barges to manned barges, issuing a minimum safe manning certificate, and providing the master of tug information on the barge and the crew onboard. Thus, the proposed approach can be expected to improve the crew's working conditions, diminish the violation of the maximum number of persons onboard the barge, and ensure the authority of the master of tug through such recommendations.

• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.4
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• pp.405-411
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• 2014

It needed the calculation of the required tugboat's power to move the damaged vessel to the safe area for reducing the additional damages. In this paper, it was verified the theoretical calculation method on the required power of tugboat through the 93m real ship tests. From the experiments, it was considered that the theoretical calculation method was sufficient to estimate the required power of tugboat. The resistance of the locked propeller was relatively big portions compared with other static resistances such as air resistance, frictional resistance and residual resistance. And dynamic resistance induced by swing movement and yawing was continuously occurred and it also was great effects on the total resistance. In the future, the safety factor will be considered and the exact prediction of ship's resistance will enhance the efficiency of tugboat because of the minimization of safety factor.