• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.300-302
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• 2014

해상교통관제(VTS, Vessel Traffic Service)는 초창기 정보 전달 역할에서 최근에 선박의사결정지원과 정보통신기술이 결합된 e-Navigation의 중심축으로 그 역할이 확대 되고 있다. 관제 구역은 선박이 항해하는 항로, 정박지, 준설구역, 급유작업, 수상레져 활동, 낚시등 다양한 해양 활동이 동시에 이뤄지고 있다. 따라서 발전하는 관제센터의 역할에 발맞춰 관제 구역에도 해양공간계획(MSP, Marine Spatial Planning) 개념을 도입하여 구역에 대한 관리를 강화해 나갈 필요가 있다. 본 연구에서는 해양공간계획을 도입한 선행 연구 사례를 검토하고 이를 우리나라 해상교통관제에 적용하기 위한 제안을 하고자 한다.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05a
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• pp.274-277
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• 2006

There are many structures attacked by chloride ions near a marine environment. And they are attacked by a salt of de-icing chemicals. So, the embedded reinforcement is corroded. In the same time, these are under a fatigue loading by a traffic loading in bridges. In previous studies, there are many researches that deal with a bond behavior under a monotonic loading according to the rate of a steel corrosion. But there are most cases that the steel corrosion and the repeated loading are acted on structures simultaneously. So, in this study, it is investigated a fatigue-bond behavior of RC structures under a steel corrosion and a fatigue loading. Main variables of the test are a corrosion of steel reinforcement and a level of stress.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.128-129
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• 2013

e-Navigation의 도입에 따라, 선박 교통 정보의 대한 공유의 필요성이 높아지고 있다. 특히 선박 교통 관제 시스템인 VTS(Vessel Traffic Service) 시스템에서도 효율적인 관제와 e-Navigation에 도입에 따라 VTS 시스템간 데이터 공유가 필요한 실정이다. 이에 따라 국제항로표지협회(IALA, International Association of Marine Aids to Navigation and Lighthouse Authorities)에서는 VTS간 데이터 교환을 위한 표준 포맷인 IVEF(Inter VTS Exchange Format)을 제정하였다. IVEF는 XML 형태로 다양한 플랫폼에서 활용가능하다. 본 논문에서는 VTS 시스템 간 데이터 교환을 위한 표준 포맷인 IVEF를 이용하여 VTS 시스템 간 데이터 공유를 위한 웹 서비스에 대해 설계하고, 이를 응용하는 방법에 대해서 설명한다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.40 no.1
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• pp.73-77
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• 2004

It is well known that the hydrodynamic interaction forces between ship and bank wall affect ship manoeuvring motions. In this paper, the calculation method based on the slender body theory for estimation of the hydrodynamic interaction forces between ship and bank wall is investigated. The numerical simulations on hydrodynamic interaction force acting on a ship in the proximity of bank wall are carried out by using this theoretical method. The theoretical method used in this paper will be useful for practical prediction of ship manoeuvrability at the initial stage of design, for discussion of marine traffic control system and for automatic control system of ship in confined waterways.

• Journal of Korea Port Economic Association
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• v.21 no.3
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• pp.83-113
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• 2005

In this study, for purpose of searching for measures to lower the logistics costs which is one of the most difficulties for the small-medium sized manufacturers in Pusan and Kimhae, those manufacturers were surveyed with questionnaire about the facts in the export logistics costs, difficulties related to the costs, and measures they thought for lowering the cost. Taking account of findings from the survey, the comprehensive measures of saving the export logistics costs were to be proposed. In the surveyed manufacturers, the problems they thought over export logistics costs lied in short logistics information and transportation-related difficulties in cargo and distribution, insufficient standardization in packaging and the shortage of material handling equipments in unloading. In transportation, frequent non-fulfillment of in-time shipment, cost increase including over consumption of transportation time due to traffic jam, and the biased heavy use of inland transportation were pointed out as problems. In customs clearance, logistics information, and marine insurance, addressed were complexity in custom clearance and bonded transportation procedures, and the shortage of software and hardware to construct logistics information system.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.169-171
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• 2013

The ships always have had the risk of collision. There are also a number of near-miss situations especially in the congested area such as port entrance, restricted waters and crossing point of the ship's route. In those areas, the navigator might have more stress than other areas. If the collision risk of decided area is calculated, it might be possible to analyse the human factors by using this data. It is also helpful for deciding a position of aids to navigation or any other system for the safety navigation. For this purpose, the model of collision risk with AIS data has been explained in this paper. The calculated result from the proposed model has been examined by using the simulation.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.845-848
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• 2008

DNP3.0(Distributed Network Protocol 3.0) 프로토콜은 자동화 처리 시스템 사이에서 Master와 Slave의 개념을 적용한 프로토콜로써 현재 한전 SCADA 시스템의 표준 프로토콜로 선정되어 원방 감시 제어용으로 사용되고 있다. 이 DNP3.0 데이터를 RS-232C를 이용해서 전송 할 때, 각각의 DNP3.0 Layer인 DataLink Layer, Transport Layer 그리고 Application Layer의 분석 모듈을 설계하고 구현하였다.

• Journal of Korea Port Economic Association
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• v.24 no.3
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• pp.79-99
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• 2008

All the major ports around the world as well as those in Korea have been exploring their own strategies to survive rapidly changing marine transport environment worldwide. In particular, Busan New Port under development still fails to meet expected logistical traffic, although it operates 6 berths. That is why it is necessary to point out current challenges in logistical strategy of Busan New Port for fully dealing with logistical traffic. Therefore, this study can propose the following ways to facilitate logistical traffic of Busan New Port. First, it is necessary to apply equal tariff to incentives given to shipping agent under the associations between existing harbors and Busan New Port. Second, it is required to increase governmental subsidy for truck freight transport. Third, it is demanded to seek possible ways to transport export and import freight and thereby create independent logistical traffic. Fourth, it is necessary to contact shipping agents residing in new ports and establish a logistical program for shipping freights via Europe, Middle East and Russia as well as those by way of North America, Japan, Korea and China, ultimately making sustainable marketing strategy to create a series of continuous transshipment freight, not temporary one. Finally, it is advisable to operate networked logistical programs with small- or medium-sized overseas shipping agents in business association with large-scale overseas shipping agents.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.51 no.3
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• pp.461-473
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• 2015

Jinhae Bay located in the southern of Korean Peninsular is an important spawning area in Korea. By some preliminary studies it was measured several times that adult Pacific codes (Gadus microcephalus) were passed (swimming layer: 15 to 18 m) over a submerged sea tunnel (sea bottom: about 30 m) rather than another immigration route when the Pacific codes were tagged surgically with an acoustic transmitters and released inside of the Bay. There is a possibility that the Pacific codes and the other fishes use the route on the sea tunnel as an immigration route are affected by a human-generated underwater noise around the sea tunnel due to the sea tunnel traffic. On this study the 25-hour measurements of the underwater noise level by water layer were conducted with a hydrophone attached on a portable CTD and an underwater noise level meter during four seasons, and the acoustical characteristics of the underwater noise was analyzed. The mean traffic volume for one hour at the sea tunnel on the spring was shown the largest value of 1,408 [standard deviation (SD): 855] vehicles among four seasons measurement. The next one was ordered on the autumn [1,145 (SD: 764)], winter [947 (SD: 598)] and summer [931 (SD: 558)] vehicles. Small size vehicle was formed 84.3% of the traffic volume, and ultra-small size, medium size, large size and extra-large size of the vehicle were taken possession of 8.7%, 3.2%, 2.0% and 1.8%, respectively. On the daily change of the noise level in vertical during four seasons the noise level of 5 m-layer was shown the highest value of 121.2 (SD: 3.6) dB (re $1{\mu}Pa$), the next one was 10 m-layer [120.7 (SD: 3.5)], 2 m- and 15 m-layer [120.3 (SD: 3.5 to 3.7)] and 1 m-layer [119.2 (SD: 3.6)] dB (re $1{\mu}Pa$). In relation with the seasonal change of the noise level the average noise level measured during autumn was shown the highest value of 123.9 (SD: 2.6) dB (re $1{\mu}Pa$), the next was during summer [121.4 (SD: 3.2)], spring [118.0 (SD: 3.4)] and winter [116.5 (SD: 5.1)] dB (re $1{\mu}Pa$). In results of eigenray computation when the real bathymetry data (complicate shape of sea bed) was applied the average number of eigenray was 2.68 times (eigenrays: 11.03 rays) higher than those of model bathymetry (flat and slightly sloped sea bottom). When the real bathymetric data toward inside (water depth becomes shallow according to a distance between the source of noise and hydrophone) of the Bay was applied on the eigenrays calculation the number of the eigenray was 1.31 times (eigenrays: 12.49 rays) larger than the real bathymetric data toward outside (water depth becomes deep with respect to the distance). But when the model bathymetric data toward inside of the Bay was applied the number of the eigenray was 1.05 times (eigenrays: 4.21 rays) larger than the model bathymetric data toward outside.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.10
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• pp.42-51
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• 1998

This paper suggests a congestion control scheme for CL (ConnectionLess) overlay network using the feedback loops between CL user and CL server, between CL servers, and between end-to-end CL users, and the header translation table of CL server. The CL overlay network for CBDS(Connectionless Broadhand Data Service) defined by ITU-T((International Telecommunication Union-Telecommunication) consists of CL servers which route frames and links which connect between CL user and CL server or between CL servers. In the CL overlay network, two kinds of congestion, CL link congestion and CL server congestion, may occur. We considered the schemes to solve the congestion. link-by-link method[18] has used the ABR feedback loops of ATM layer between CL user and CL server or between CL servers, and the congestion table using header translation table of CL server. As in congestion of output virtual channel this method has an effect on all the traffic transmitting through the link, then it has an effect on the traffic that has not caused the congestion. As a result, the link utilization of output virtual channel that does not bring the congestion and outputs the traffic is decreased. To overcome this drawback of link-by-link, we proposed the hybrid method that are using the ABR feedback loops of link-by-link method, the feedback loop between CL users in end-to-end, the congestion table using and the header translation table. This scheme deals with teh congestion immediately by link-by-link loops and the header translation table, and then regulates the sending rate of CL user that causes the congestion by end-to-end loop.