• Journal of Fisheries and Marine Sciences Education
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• v.27 no.1
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• pp.133-144
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• 2015

Recently, Korea shipping companies have been internally/externally difficult to manage their fleet due to the high price of bunker, wage and low cost of charterage and freight. To solve these problems, some shipping companies have tried to set up a new business regarding offshore plant supply vessel(OSV). Owing to the absence of big oil field near the Korea coast, OSV market has not been gradually progressing as far. This study intends to review the legal review of both international and municipal law for the OSV. Therefore I have provided basic legal information to the domestic shipping companies which have desired to enter the OSV's market and suggest legal revision harmoniously to identify the problem in the municipal law.

• Journal of Fisheries and Marine Sciences Education
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• v.25 no.2
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• pp.287-300
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• 2013

With the advent of the Internet era, most industries are actively taking part in the web-based electronic commerce markets. To come up with the trend, Korean shipping companies have built their own websites and tried to take advantage of the state-of-the-art technology. This paper aims to analyze recent developments in e-commerce of shipping industry and, Also the study suggests several solutions to invigorate the virtual transactions. To analyze recent developments, this paper carries out a cases study on the websites of 5 major shipping companies in Korea. Each sites are evaluated with respect to 4C's(Contents, Commerce, Community, Connection) analysis.

• Transactions on Control, Automation and Systems Engineering
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• v.3 no.2
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• pp.77-82
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• 2001

This paper deals with a fault detection algorithm for linear descriptor systems via unknown input PI observer. An unknown input PI observer is presented and its realization conditions is proposed by using the rank condition of system matrices. From the characteristics of unknown input PI observer, the states of system with unknown inputs are estimated and the occurrences of fault are detected, and its magnitudes are estimated easily by using integrated output estimation error under the step faults. Finally, a numerical example is given to verify the effectiveness of the proposed fault detection algorithm.

• Transactions on Control, Automation and Systems Engineering
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• v.3 no.2
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• pp.71-76
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• 2001

This paper deals with an estimation method for sideslip angle by using an unknown disturbance observation technique in 4WS passenger car systems. Firstly, a 4WS vehicle model with 3DOF is derived under the constant velocity and same tyres properties. The vehicle dynamics is transformed into the linear state space model with considering the external disturbances. Secondly, and unknown disturbance observer is introduced and its property which estimating the states of system without any disturbance information is shown. Lastly, the estimated sideslip angle of the 4WS vehicle system is verified through numerical simulation.

• The Journal of Information Systems
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• v.6 no.1
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• pp.143-158
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• 1997

물류산업 분야에서 EDI를 도입하기 위한 노력이 해양수산부와 항만 운영회사를 중 심으로 지속적으로 이루어지고 있다. 이러한 노력에도 불구하고 우리 나라 물류 ED 시스템 은 종이 서류를 전자 서류로 대신하는 시스템 구조를 채택하고 있기 때문에 이 문제를 극복 할 수 있는 새로운 시스템의 출현이 요구된다 하겠다. 본 논문은 우리 나라에 도입되어 운 영되고 있는 물류 EDI 시스템이 보다 한 차원 높게 발전하기 위해 요구되는 시스템의 성공 요인을 제시하는데 있다. 국가 또는 항만 단위의 물류정보 시스템이 보다 효율적으로 운영 되기 위해서는 단순한 전자 문서 전송방식보다는 데이터의 공동 이용 방식을 채택하는 시스 템으로 전환되어야 한다. 그 이유는 항만을 중심으로 전송되는 물류 데이터는 그 특성상 약 간의 수정을 거쳐 반복적으로 물류 조직 사이에 전달되기 때문이다. 본 연구를 위해 독일, 프랑스, 영국, 미국, 일본 등 발전된 물류정보 시스템이 검토되며, 아울러 KL-Net이라 불리 우는 우리 나라 물류정보 시스템의 고찰이 이루어지고 있다. 선진화된 항만의 물류정보 시 스템으로부터 시스템의 성공 요인이 도출되며 이 시스템을 실현하는데 경험하게 될 몇 가지 어려운 점이 논의되고 있다.

• Journal of Electrical Engineering and Technology
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• v.1 no.1
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• pp.42-51
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• 2006

The main purpose of this paper is to calculate the behaviors of inter-phase spacers to reduce the amplitude of galloping in conductors. In simulation, three phases and iced-single/two-bundles conductors with/without spacers are considered in viewpoint of standard cases. The implicit/explicit finite element methods are used to calculate the transient response with geometric nonlinear behavior. The ANSYS/LS-DYNA program is also applied. Calculation results can be used to predict the positions to insert the inter-phase spacers between conductors.

• Journal of Mechanical Science and Technology
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• v.15 no.12
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• pp.1609-1615
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• 2001

This paper presents the characteristics of a general structured observer and presents an estimation algorithm for a system with external disturbances which are added to the input of the system. By using a disturbance model, the general structured observer can estimate the states of the system is spite of disturbances, where the system is affected from external disturbances. Also, the general structured observer can include the function of a PI observer or high gain observer by properly adjusting the observer's gain matrices. The existence condition for the observer is derived, which can be checked by the system's observability condition and the pole-zero cancellation of the system's polynomial matrix. Through a numerical example, it is verified that the proposed observer is effective estimating the system and the input disturbance.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2002.11a
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• pp.53-61
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• 2002

This paper aims to apply a supply chain modeling and its analysis framework to the supply chain in the port industry, each of which has its own objective. The simulation approach serves two purposes: to model a supply chain network in quantity approach and to evaluate its supply chain performance based on proposed strategies. The simulation model will be applied to quantifying the flow of a supply chain, the involved information and material flow and conducted to simulate the supply chain operations. The model will also be used which strategic and operational policies are the most effective in smoothing the variations in the supply chain.

• Journal of the Korean Institute of Navigation
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• v.18 no.3
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• pp.11-18
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• 1994

In the present trends at which vessels would be supersizedly designed for adapting special cargoes in order for effective controls of logistics in marine transportation, it brings poor manoeuvrability of ships and makes environmental or economical loss seriously due to accidents of a large scale at sea. International Maritime Organization adopted manoeuvring standards and also recommended manoeuvring booklets for ship operators recently. We attempted to find variation of hydrodynamic derivatives when a bare hull was fitted with propeller and rudder, or propeller only by captive model test in the circulating water channel. On comparing experimental results with theoretical values derived from equations, almost same tenden-cies were found at hull-propeller-rudder and hull-propeller situations. Interactions with rudder displayed well at large drift angles.

• Journal of Navigation and Port Research
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• v.32 no.3
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• pp.167-172
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• 2008

The aim of this paper is to determine the replacement time of containerships in economical viewpoint. Especially, there was a lot of vagueness to the cost data for calculation of an economical life in a containership. For this, a fuzzy number used to express the vague nature about a cost data. This paper developed the fuzzy cost model using fuzzy numbers, and to analyze more practically than the existing cost model. And the proposal model used to decide the economical life about various kinds of containerships.