• Journal of Navigation and Port Research
• /
• v.34 no.8
• /
• pp.609-614
• /
• 2010

This paper describes statistical parameter estimation to calculate collision probabilities between Mokpo Harbor Bridge and passing vessels. At first, we obtained AIS (Automatic Identification System) information from passing vessels, then after, analyzed the lateral distributions of vessel tracks and estimated the mean and the standard deviation for the distance away from bridge center, the passing course and the passing speed. The analysis results of track distribution for the distance away and the passing course are shown as normal type, otherwise the speed distribution shown as two kinds of different normal type. In addition, we testified that the usefulness of estimated parameter values through the relative comparison between the track distributions and it's normal probability distributions.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2011.06a
• /
• pp.225-226
• /
• 2011

IALA Waterway Risk Assesment(IWRAP)에서 선박의 충돌확률은 기하학적인 선박의충돌확률(geomatric probability)에 인과관계 확률(causation probability) 곱한 값으로 해당수역의 양적인 충돌확률 평가에 이용되고 있다. 이를 통해 목포대교부근에 통항하는 선박의 선종별 충돌확률 및 입출항 선박 전체 충돌 확률 값을 분석하고자 한다.

• Journal of Navigation and Port Research
• /
• v.34 no.6
• /
• pp.405-415
• /
• 2010

To assess the possible collision risk between Mokpo Harbour Bridge, which is under construction, and passing vessels, we proposed Real-Time Bridge-Vessel Collision Model (RT-BVCM) in this paper. The mathematical model of RT-BVCM consists of the causation probability by the vessel aberrancy due to navigation environments, the geometric probability by the structural feature of a bridge relative to a ship size and, the failure probability by the ship collision track and the stopping distance which is not to come to a stop before hitting the obstacles. Then, the probabilistic mathematical model represented as risk index with the risk level from 1 to 5. The merit of the proposed model to the collision model proposed by AASHTO (American Association of State Highway and Transportation Officials) is that it can provide enough time to take adequate collision avoiding action. Through the simulation tests to the two kinds of test ships, 3,000 GT and 10,000 GT, it is cleary found that the proposed model can be used as a collision evaluation model to the passing vessel and Mokpo Harbour Bridge.

• Journal of Navigation and Port Research
• /
• v.35 no.1
• /
• pp.1-7
• /
• 2011

This paper describes the development of Data Acquisition System (DAS) to obtain the vessel and weather information needing to evaluate collision risks levels between Mokpo harbor bridge and passing vessels. DAS consists of Signal Receiving and Processing Unit to obtain the data sets of passing vessels and weather status, Networking Unit to transmit and distribute the acquisition data sets and Data Management Unit. Through the field tests on the deck of shuttle car ferry between Mokpo Port Passenger Terminal and An-Jua island, Sinan-Gun, we found that the DAS can provide useful data sets for adequate the collision risk evaluation. In addition, the noise-like data sets appeared in the weather data can be suppressed fully using 5-th order Butterworth digital filter.

• Computational Structural Engineering
• /
• v.23 no.1
• /
• pp.25-30
• /
• 2010

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2012.10a
• /
• pp.171-173
• /
• 2012

최근 해상교량을 비롯한 다양한 형태의 해상시설물이 건설 중에 있으며, 선박과 시설물의 충돌 등 안전사고도 또한 급증하고 있다. 본 연구에서는 해상에 새로운 시설을 설치할 때 해상교통을 고려한 적정항로폭 및 안전수역에 대하여 분석하였다. 목포대교 인근수역을 대상으로 통계적 분석을 통해 교통 흐름을 재현하고, 환경스트레스 모델을 이용하여 수역안전성을 평가하였다.

• Journal of the Korean Society for Marine Environment & Energy
• /
• v.7 no.2
• /
• pp.89-97
• /
• 2004

Recently, Namak New Town is under construction adjacent to Mokpo City, and New Great Harbour Bridge between Mokpo City and Koha Island is designed to be built across Inner Harbour of Mokpo. Citizens' concerns about and participations in 「Campaign for Shaping Mokpo into Beautiful Seaport」 are required to make up the sight of Mokpo harbour beautifully. The of 「Master Plan for the Development of Beautiful Mokpo Seaport」 was reviewed. Citizens' levels of consciousness of and participation in 「Campaign for Shaping Mokpo into Beautiful Seaport」 were ascertained through questionnaire surveys of citizenry opinions, and prerequisites and requirements for the success of 「Master Plan for the Development of Beautiful Mokpo Seaport」 were suggested on the basis of the results of questionnaire surveys. As most of citizens are not satisfied with the existing urban environment in Mokpo City, the urban environment and the view of Mokpo are required to be made up according to the natural, social and environmental characteristics of Mokpo and its adjacent Islands in coastal waters. In order to cultivate citizens' basic cultural consciousness and sense of public kindness, cleanliness and orderliness, various educational programs are required to be developed and executed. Only when local government of Mokpo City collects the public opinions and continues to shape Mokpo into international beautiful seaport in the direction of a reflex of public opinion, Mokpo harbour can be made up into international beautiful seaport successfully with citizens' positive participation in citizenry practicable action plan.

• Journal of Navigation and Port Research
• /
• v.46 no.4
• /
• pp.303-312
• /
• 2022

Bridges across waterways act as interference factors, that reduce the navigable water area from the perspective of navigation safety. To analyze the safety navigational width of ships navigating bridges across waterways, the optimal traffic distribution based on AIS data was investigated, and ships were classified according to size through k-means clustering. As a result of the goodness-of-fit analysis of the clustered data, the lognormal distribution was found to be close to the optimal distribution for Incheon Bridge and Busan Harbor Bridge. Also, the normal distributions for Mokpo Bridge and Machang Bridge were analyzed. Based on the lognormal and normal distribution, the analysis results assumed that the safe passage range of the vessel was 95% of the confidence interval, As a result, regarding the Incheon Bridge, the difference between the normal distribution and the lognormal distribution was the largest, at 64m to 98m. The minimum difference was 10m, which was revealed for Machang Bridge. Accordingly, regarding Incheon Bridge, it was analyzed that it is more appropriate to present a safety width of traffic by assuming a lognormal distribution, rather than suggesting a safety navigation width by assuming a normal distribution. Regarding other bridges, it was analyzed that similar results could be obtained using any of the two distributions, because of the similarity in width between the normal and lognormal distributions. Based on the above results, it is judged that if a safe navigational range is presented, it will contribute to the safe operation of ships as well as the prevention of accidents.

• Journal of the Korean Society for Marine Environment & Energy
• /
• v.7 no.2
• /
• pp.98-103
• /
• 2004

Recently, a New Great Harbour Bridge between Mokpo City and Koha Island is planned to be built across Mokpo Inner Harbour, and Namak New Town is under construction adjacent to Mokpo. Citizels' concorn of and participation in 「Campaign for Shaping Mokpo into Beautiful Seaport」 are necessary to match the view of Mokpo harbour with natural scenery beautifully and with marine environment harmoniously. Citizens'ㄹ levels of consciousness of coastal and marine environment were ascertained through questionnaire surveys of local citizenry attitudes and opinions, and citizenry action plans for the conservation of coastal and marine environments around Mokpo harbour are suggested on the basis of the results of questionnaire surveys. Citizens' voluntary participations in local policy for the control of marine wastes production and in a campaign for the collections of marine debris and wastes around beaches and coastal areas are required. The operation of municipal sewage treatment plants is to be performed effectively and efficiently, and to be monitored and evaluated periodically by the general public, the local federation for environmental movement or NGO. The development and performance of marine environmental education programs and an enlightenment campaign for environment preservation are to be incessantly done in cooperation with local residents. Only when local government of Mokpo collects the public opinions and continues to shape Mokpo into international beautiful seaport in the direction of a reflex of public opinion, coastal and marine environment around Mokpo harbour can be kept in good condition with citizens' positive participation in citizenry long-term practical action plans for environment conservation.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.26 no.2A
• /
• pp.371-382
• /
• 2006

A buffeting analysis is utilized for the estimation of aerodynamic vulnerability of a cable-stayed bridge due to upcoming wind turbulences. The buffeting analysis requires several input parameters such as structural parameters, aerodynamic parameters, and aero-elastic parameters. This study is motivated to estimate the sensitivity of these parameters on buffeting responses. The Seohae bridge is selected as an example bridge. The investigated parameters consist of the inclination of lift and drag coefficient of stiffening girder section, exponential decay factors of span-wise distributed wind turbulences, roughness length, spectra of wind velocity fluctuation, and structural damping. The buffeting response showed high dependency on the input parameters. As conclusions, the importance of parameter selection is emphasized. A further study is also proposed for more general conclusions.