• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2010.10a
• /
• pp.180-181
• /
• 2010

An estimation algorithm of collision risk among multiple ships has been developed in order to reduce human error and prevent collision accidents. The algorithm is designed to calculate the collision risk among ships based on Fuzzy theory by using AIS data as traffic information. In this paper, to validate the algorithm, the AIS data of actual collision accident, which occurred between a product carrier and a cargo carrier in Busan harbor in 2009 are collected. The replay simulation is carried out on the actual AIS data and the collision risk is calculated in real time. In this paper, the features of the estimation algorithm of collision risk and the results of replay simulation based on AIS data of actual collision accident are discussed.

• Journal of Navigation and Port Research
• /
• v.34 no.10
• /
• pp.727-733
• /
• 2010

An estimation algorithm of collision risk among multiple ships has been developed in order to reduce human error and prevent collision accidents. The algorithm is designed to calculate the collision risk among ships based on Fuzzy theory by using AIS data as traffic information. In this paper, to validate the algorithm, the AIS data of actual collision accident, which occurred between a product carrier and a cargo carrier in Busan harbor in 2009 are collected. The replay simulation is carried out on the actual AIS data and the collision risk is calculated in real time. In this paper, the features of the estimation algorithm of collision risk and the results of replay simulation based on AIS data of actual collision accident are discussed.

• Journal of Arbitration Studies
• /
• v.14 no.2
• /
• pp.281-300
• /
• 2004

This paper is about a case on the arbitration of disputes between the parties of charter party. 'B' vessel owner on the original charter party first made a charter party with 'L' cargo owner on the original charter party. Then, 'B' entered into another charter party with 'D' vessel owner, who will actually take charge of carriage of the cargoes which is described on the original charter party. Therefore, 'B' is a carrier of cargoes of 'L' and 'D' is a carrier of cargoes of 'B', according to the contracts. The cargoes of 'B' is cargoes of 'L', by nature. In these circumstances, damages to the cargoes occurred in the transit by the vessel of 'D'. Who should take the responsibility for the damage of cargoes? Who must be liable for those, 'B' or 'D'？. According to the original charter party, 'L' signed 'as Charterers' and 'B' was the counterpart of 'L'. But 'B' signed as 'for and on behalf of 'B',' without 'as Owners'. Tribunal of arbitration award that 'B' should take the responsibility for the damage to the cargoes, because 'B' is the vessel owner. Although 'B' is a contract carrier, 'B' must bear the liability of transport of the cargoes. The counterpart of charterer, 'L' is 'B' who is presumed to be the vessel owner by the original charter party. 'D', actual carrier is not the privy of 'L', cargo owner. This case teach us that signature on the contract is the matter of great importance.

• Special Issue of the Society of Naval Architects of Korea
• /
• 2017.10a
• /
• pp.93-104
• /
• 2017

IMO type C independent tank is one of the cargo containment system specified on IGC code. It is normally adopted for small and medium size liquefied gas carrier's cargo containment system and it can be applied to fuel tank of LNG fueled vessel. This study focuses on rule scantling process and evaluation methods in early design stage of type C independent tank. Actual design results of 22K LPG/Ammonia/VCM carrier's No.2 cargo tank are demonstrated. This paper presents the calculation methods of design acceleration and liquid height for internal design pressure as defined on IGC code. And this paper shows the applied results of classification rules about shell thickness requirement and buckling strength. Additionally this paper deals with evaluation methods of structural strength and cumulative fatigue damage using FE analysis.

• Journal of Ocean Engineering and Technology
• /
• v.27 no.1
• /
• pp.74-79
• /
• 2013

In the context of the structural performance of an LNG hold, the mechanical characteristics of the insulation material are considered to be a critical design factor under cryogenic temperatures. This paper presents the thermal elasto-plastic behavior of the reinforced polyurethane foam (RPUF) adapted for the insulation material of a membrane-type LNG carrier via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the thermal transfer and thermal elasto-plastic deformation characteristics of an actual RPUF specimen. The heat transfer simulations based on the finite element method (FEM) include a forced convection analysis. The results of heat transfer analyses are compared with the experimental results. Reasonable cryogenic conditions for RPUF are reviewed based on both the analysis and experimental results.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.9 no.5
• /
• pp.568-576
• /
• 2017

With an increase in the usage of LNG, there is a heightened interest about its safety aspects regarding the explosion of LNG carrier tank. The need for a cryogenic explosion-proof camera has increased. The camera has to work in cryogenic environment (below $-160^{\circ}C$) in LNG carrier. This study conducted design and heat transfer analysis of cryogenic camera to secure working time in limitation of heat source. The design with gap width of double pane windows was conducted based on simple vertical cavity model to insulate from cryogenic environment. The optimal gap width was 12.5 mm. For effective analysis considering convection within the camera, equivalent thermal conductivity method was adopted with ABAQUS. The working time of the camera predicted was over 10 h at warm-start condition. In cold-start condition, it required about 5 h of pre-warming time to work. The results of analysis were compared with the ones of the actual cryogenic test.

• Proceedings of the IEEK Conference
• /
• 2000.11a
• /
• pp.53-56
• /
• 2000

In this paper, the architecture for the residential gateway is designed for the traffic statistics of home environment. The suitability of 10 Mbps power line communication is investigated for the control and the video data distribution through simulation. The design issues are discussed for a residential gateway and the network design that is based on the power line communication is presented. Traffic models are established from the actual traffic traces. They are used for performance evaluation of residential networks.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.373-374
• /
• 2008

Insulating polymers and their composites have been widely used in various electric apparatus or cables. Recently, the effects of interfaces (metal/insulator or insulator/insulator interfaces) on electrical insulation have attracted much attention. However, interfacial phenomena in actual insulation systems and their physical backgrounds are not well understood yet. In this paper, the behaviour of charge carriers near the metal/polymer interface and its effects on conduction and breakdown phenomena are discussed. The metal/polymer interface strongly affects carrier injection, space charge formation and breakdown phenomena. Based on their experimental results, the physical backgrounds of the interfacial phenomena are explained.

• The Korean Journal of Air & Space Law and Policy
• /
• v.24 no.2
• /
• pp.19-45
• /
• 2009

The purpose of this paper is to research the contents and issues of the draft legislation of Part VI the Carriage by Act of Korean Commercial Code in respect of the liability of the carrier in the carriage of cargo by air, comparing to the related provisions of the Montreal Convention of 1999. The Montreal Convention in respect of the international carriage by air was adopted in 1999, and Korea has ratified the Montreal Convention in 2007. However, there is now no national legislation in respect of the carriage by air in Korea. Thus, the Ministry of Justice has prepared the draft legislation of Part VI the Carriage by Air of the Korean Commercial Code in July 2008, and the draft legislation is now being reviewed by the National Assembly. The draft provisions of Part VI the Carriage by Air are basically adopting most of the related provisions of the Montreal Convention in respect of the carriage of cargo by air and some draft provisions are applying the related provisions of the Korean Commercial Code in respect of the carriage of cargo by land and sea. In respect of the liability of the carrier in the carriage of cargo by air, the contents of the draft legislation of Part VI the Carriage by air are composed of the provisions in respect of the cause of the liability of the and the application for the non-contractual claim, the limit of liability, the exoneration from liability, the extinguishment of liability, the notice of damage to cargo, the liability of the agents and servants of the carrier, and the liability of the actual carrier and successive carrier. The draft legislation of the Carriage by Air of Korean Commercial Code is different from the provisions of the Montreal Convention is respect of the liability of the carrier in the carriage of cargo by air as follows : the draft Article 913 paragraph 1 provides additionally the riot, civil war and quarantine as the exoneration causes from the liability for damage to the cargo of the carrier in the Article 18 paragraph 2 of the Montreal Convention. In respect of the liability of the carrier in carriage of cargo by air, the draft legislation of Part VI the Carriage by Air does not provide the settlement by arbitration of dispute relating to the liability of the carrier and the requirement of adequate insurance covering the liability of the carrier which are provided in the Montreal Convention. In author's opinion, it is desirable that the above mentioned provisions such as the arbitration and the insurance shall be inserted into the draft legislation of the Carriage by Air of Korean Commercial Code. In conclusion, the legislation of Part VI the Carriage by Air of the Korean Commercial Code shall be made by the National Assembly as soon as possible for the smooth and equitable compensation for damage to cargo arising during the carriage by air.

• JSTS:Journal of Semiconductor Technology and Science
• /
• v.8 no.2
• /
• pp.115-120
• /
• 2008

Carrier velocity in the MOSFET channel is the main driving force for improved transistor performance with scaling. We report measurements of the drift velocity of electrons and holes in silicon inversion layers. A technique for extracting effective carrier velocity which is a more accurate extraction method based on the actual inversion charge measurement is used. This method gives more accurate result over the whole range of $V_{ds}$, because it does not assume a linear approximation to obtain the inversion charge and it does not limit the range of applicable $V_{ds}$. For a very short channel length device, the electron velocity overshoot is observed at room temperature in 37 nm MOSFETs while no hole velocity overshoot is observed down to 36 nm. The electron velocity of short channel device was found to be strongly dependent on the longitudinal field.