• Title/Summary/Keyword: Marine traffic

Search Result 628, Processing Time 0.029 seconds

Implementation of Timing Synchronization in Vehicle Communication System

  • Lee, Sang-Yub;Lee, Chul-Dong;Kwak, Jae-Min
    • Journal of information and communication convergence engineering
    • /
    • v.8 no.3
    • /
    • pp.289-294
    • /
    • 2010
  • In the vehicle communication system, transferred information is needed to be detected as possible as fast in order to inform car status located in front and rear side. Through the moving vehicle information, we can avoid the crash caused by sudden break of front one or acquire to real time traffic data to check the detour road. To be connecting the wireless communication between the vehicles, fast timing synchronization can be a key factor. Finding out the sync point fast is able to have more marginal time to compensate the distorted signals caused by channel variance. Thus, we introduce the combination method which helps find out the start of frame quickly. It is executed by auto-correlation and cross-correlation simultaneously using only short preambles. With taking the absolute value at the implemented synch block output, the proposed method shows much better system performance to us.

A Study on the Development of the Navigational Information Monitoring and Recording System (항해 정보 모니터링 및 기록 시스템 개발에 관한 연구)

  • 송두현;이덕수;정태권
    • Journal of the Korean Institute of Navigation
    • /
    • v.23 no.3
    • /
    • pp.1-15
    • /
    • 1999
  • Recently, due to the several factors such as the advent of very large vessels and high-speed vessels, and the increase of the maritime traffic density at sea, the obligation, responsibility and burden of marine officers on duty for the safety of navigation has been highly escalated. Under these situations, if the appropriate and correct navigational information is given to officers at real time by means of certain integrated information processing system, these obligation, burden and danger can be reduced. This paper deals with the study on the development of the Navigational Information Monitoring and Recording System that can give and record the integrated navigational information based on the personal computer system installed on board. To construct this system, the interface unit which changes different signal types of navigational equipments to NMEA 0183 signal format and the application software to show the visual navigational information were developed. In this study, the navigation system of T/S HANBADA in Korea Maritime University was used in order to construct the actual system that can be utilized in other ships, and also the performance test was carried out several times to examine the performance of the system developed. It was proved that all functions of the system as designed worked smoothly through the performance test. Also this system could be operated easily and conveniently by every user.

  • PDF

Distribution of PCBs in Surface Sediments inside Seogwipo and Hallim Harbors of Jeju Island, Korea (제주도 서귀포항 및 한림항내 표층퇴적물의 PCBs 분포)

  • Cho, Eun-Il;Heo, Ryun-Yong;Lee, Min-Gyu;Kam, Sang-Kyu
    • Journal of Environmental Science International
    • /
    • v.26 no.5
    • /
    • pp.639-649
    • /
    • 2017
  • Measurements of polychlorinated biphenyls (PCBs) were taken in surface sediments inside Seogwipo and Hallim Harbors of Jeju Island, Korea, to evaluate their distribution. These harbors typically have heavy ship traffic. The samples were collected three times (in June, October, and December, 2013). PCB concentrations in sediments from Seogwipo Harbor were higher than in those from Hallim Harbor, but both levels were very low, compared with those in other parts of the world. Sedimentary PCB levels had a strong correlation with organic carbon and fine granule mud content. PCB concentration values in the examined surface sediments were much lower than Sediment Quality Guidelines (SQGs) such as ER-L (Effect Rrange-Low), TEL (Threshold Effects Level) and ISQG (Interim Sediment Quality Guideline)-low value applied in countries, such as USA, Canada, and Australia. This suggests that the PCBs did not have significant biological effects on benthic organisms in the marine environment.

Integration of AIS and radar target information for offshore fishing vessels (근해 어선에 대한 AIS와 레이더 표적정보의 통합)

  • Lee, Dae-Jae
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.50 no.1
    • /
    • pp.21-29
    • /
    • 2014
  • The dynamic information of radar and automatic identification system (AIS) for targets obtained from the traffic vessels operating in the north outer harbor and surrounding waters of Busan port, Korea. The target information was analyzed to investigate the potential collision risk resulting from the invalid true heading (HDT) information of AIS and the integration ambiguity in the graphic presentation of both tracked data sets for two systems. An integrated display system (IDS) for supporting the navigator of offshore fishing vessels was also developed to find possible maneuvering solutions for collision avoidance by comparing radar data with AIS data in real-time at sea. Consequently, the multiple functions of IDS can provide additional information that is potentially valuable for taking action to avoid the collision in offshore fishing vessels. However, the integration criteria of radar and AIS targets in the IDS must be carefully established to eliminate the fusion ambiguity in the graphic presentation of both AIS and radar symbols such as the one or two physical targets which are very close to each other.

The Interaction Effect Acting on a Ship Hull in the Proximity of Bank Wall (측벽근방을 항해하는 대형선박에 미치는 측벽의 영향)

  • Lee, Chun-Ki;Park, Hain-Il
    • Journal of Navigation and Port Research
    • /
    • v.28 no.5
    • /
    • pp.333-337
    • /
    • 2004
  • It is well known that the hydrodynamic interaction forces between ship and bank wall affect ship manoeuvring motion This paper deals with the interaction effect acting on a ship navigating closely in the proximity of bank wall. 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 applied. The hydrodynamic interaction forces acting on a ship during passing through the proximity of the bank wall are predicted to evaluate an influence of these interaction forces on ship manoeuvrability. The calculation method used in this paper will be useful for prediction of ship manoeuvrability at the initial stage of design, for automatic control system of ship in confined waterways, for discussion of marine traffic control system and for construction of harbour.

The Construction of the Automatic Object Targeting System for Sailing Lookout (차세대 항해 견시를 위한 선박 자동추적 시스템 구축)

  • Kim, Ki-Uk;Lee, Byeong-Geol
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.17 no.7
    • /
    • pp.1583-1588
    • /
    • 2013
  • According to 2008 statistics, there is a need for sailing lookout to minimize the ships collision that caused a secondary damage such as environment pollution and it happened 25 percentage rate. The aim of this study is to construct the object targeting system for notifying the sailing and ship information as monitoring the marine with CCTV having a zoom, rotation, and tile function. In this study we expected to induce the safety sailing by offering the CCTV automatic treatment.

Study on Freight Transportation with Train Ferry between Korea and China (한.중간 열차페리를 이용한 화물수송방안연구)

  • 이용상;노학래;정병현
    • Proceedings of the KSR Conference
    • /
    • 1999.05a
    • /
    • pp.41-51
    • /
    • 1999
  • Trade between Korea and China was 372million dollars accounting for 1.56% of total in 1988 and has been increased to 23,689 million dollars occupying 7% in 1997, which implies 32.2% increase on average per year. This trend will continue dramatically and consistently as China's open policy toward the world accelerates and korean companies advance into chinese market. The main trade routes are with marine transportation between korean west sea area and chinese San-Dong peninsula around east sea. However, due to the increasing traffic congestion on main roads connecting harbors and main consumer cities and capacity problem in west sea harbor areas, the logistics cost have been increased resulting in losing competitiveness of freight trade. Therefore, these road-oriented inland transportation means need to be changed to rail transport system to reduce congestion and to conserve natural environment. To achieve this scheme, efficient intermodal transportation system connecting road and rail should be constructed. These combined system will ensure timely delivery of goods and consequently the customers would make proper transportation schedule for the import/export goods in advance. Especially, combined transportation of Railroad and train ferry would cope with the logistics problem and this system would be efficient means for trade with not only China but further with many adjacent countries in central asia such as Kazakhstan and Uzbekistan

  • PDF

Application of Digital Human Modeling for Design of Yacht

  • Kim, Dong-Joon;Ko, Chan Gil;Lee, Yujeong;Chang, Seong Rok
    • Journal of the Ergonomics Society of Korea
    • /
    • v.32 no.5
    • /
    • pp.475-480
    • /
    • 2013
  • Objective: In this study, virtual reality was adopted to consider ergonomic factors in yacht design. Virtual human which is the same actual human was created in virtual environment using Digital Human Modeling which has been used in the manufacturing communities to design better workplaces and maximize the safety of workers. Background: During the past 40 years yachting has expanded from being, generally speaking, a minority sport - too expensive for the large majority of people - into a major recreational activity practiced by millions all over the world. Many new yacht designs have appeared and number of professional, as well as amateur designers has increased steadily. But they had not considered ergonomic factors in yacht design. Method: Worker's posture, traffic line and workload had been analyzed in sailing yacht. After the caution level was evaluated, we pointed out clues which had high workload and interference. To reduce workload, we applied ergonomic principles for improving working conditions and environments in Digital Human Model. Results: We found the space problems and workload of postures. Conclusion: (1) Unnatural posture of crews was sustained. (2) Workload that occurs in the human body was overloaded. (3) Crew's work space was very narrow. Application: This study will be applied the new ergonomic design of yacht.

A Taxonomical and Ecological Study on the Flora of Chuja Island (추자도 식물상에 관한 분류$\cdot$생태학적 연구)

  • Lim, Joung Whan;Ho Joon Lee;Chang Ho Kim;Seon Ho Kim
    • The Korean Journal of Ecology
    • /
    • v.5 no.4
    • /
    • pp.187-203
    • /
    • 1982
  • The results obtained from te field investigations of Chuja Island conducted for 5 days from July 18 to 22, 1980 and from August 12 to 16, 1981 are summarized as follows: Vascular plants of this island disclosed by the present study consisted of 86 families, 210 genera, 228 species, 38 varieties and 4 래금. Nineteen species of evergreen broad-leaved trees were discovered, including Litsea japonica Juss, Camellia japonica L. and Machilus thunbergii Sieb. et Zucc. These indeciduous latifoliate trees were preserved in poor condition. Ten-twenty years old Pinus thunbergii was confirmed to be the predominant species. Seaside plants encountered were 6 species, including Vitex rotundifolia L. Fil. and Asterspathullfoius Max., but they were poorly distributed. Naturalized plants comprised a total of 12 species. This varied number of species is considered attributable to the frequent access of men owing to convenient marine traffic. the destruction of vegetation of this island may be attributed to human interference (loggin for boat construction, building and charcoal materials) ever escalated by high population density. It is worthy of noting that Bochmeria penosa Nakai et Stake which forms a large community in this island can be used as textile resources.

  • PDF

Safe Navigation Plan for Dredging Operations to build Sunken Tunnel for Access Road between Busan-Geoje (부산-거제간 연결도로 침매터널공사의 준설작업에 따른 안전통항방안)

  • Kim, Jung-Hoon;Gug, Seung-Gi
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • v.1
    • /
    • pp.509-514
    • /
    • 2006
  • This research does by purpose that present safe navigation plan for ships during doing dredging construction with dredger crossing waterway of Gadeok. Dredging operations need to build sunken tunnel that cross the bottom of the sea under waterway of Gadeok for access road construction between Busan- Geoje. Accordingly, dredger must cross and dredge waterway of Gadeok fatally. There is possibility of marine accident of collision for latent danger situation of ships to navigate waterway of Gadeok relatively. Therefore, safe navigation plan of ship is groped in reply and its countermeasure is presented.

  • PDF