• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.305-308
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• 2014

AIS(Automatic Identification System) is a radionavigation equipment for exchanging safety related information between ships as well as ship and shore station, introduced by SOLAS convention and widely used especially in vessel traffic service. The dynamic data of AIS is transmitted at intervals of 2 second to 3 minutes depending on ship's navigational status and speed. However, so often times it happens that some AIS data can not be received due to increasing AIS traffic and it's time slot confliction. In this paper, a revised reporting intervals of AIS dynamic data is proposed in order to decrease AIS data link load.

• Journal of Convergence for Information Technology
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• v.9 no.12
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• pp.24-29
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• 2019

AIS is one of the most critical systems in any organization. Data quality plays a critical role in a knowledge-based economy. The objective of this study is to identify the most important factors for accounting information quality and their impact on AIS data quality outcomes. This study includes an extensive literature review to identify a set of CSF for data quality. The study uses empirical data to test the research hypothesis and resluts show that the top three most important factors that affect AIS's data quality are toop management commitmentm the nature of the AIS and input controls. The study further uses regression analysis to test the effect of those factors on AIS data quality, finding that there is a significant positive relationship between the perceived performance of the three factors and AIS data quality putcomes. To be develop to AIS data quality further study for CSF's control methodology is necessary.

• Journal of Navigation and Port Research
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• v.46 no.6
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• pp.576-584
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• 2022

AIS is widely utilized in vessel traffic services for marine traffic safety. In 2021, Korea deployed the high-speed maritime wireless communication system (LTE-Maritime) on the sea following IMO's proposal for the introduction of e-Navigation. In this paper, vessel trajectory data from AIS and LTE-Maritime were used for vessel trajectory prediction to compare and analyze the two systems. The results show that the trajectory prediction error of LTE-Maritime was smaller than that of AIS due to the granular and uniform data provided by LTE-Maritime. Additionally, it was revealed that time interval is the most important factor influencing the errors in trajectory prediction, with the prediction error of LTE-Maritime growing at a slower rate of 17% than AIS. This research contributes to the literature by quantitatively comparing AIS and LTE-Maritime systems for the first time.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.10a
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• pp.111-113
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• 2014

AIS의 항해상태 정보는 사용자가 수동으로 변경 입력해야 하는 정보이며, 항해상태 정보에 따라 AIS의 동적정보 전송주기는 자동으로 변하게 된다. 정박 또는 묘박선의 경우 AIS 항해상태 정보를 정확하게 입력하지 않으면 동적정보가 불필요하게 자주 발신되어 AIS의 슬롯 점유율을 높이는 결과를 초래한다. 본 논문에서는 정박선의 AIS 데이터를 수신하여 비정상적으로 동적정보가 전송되는 경우를 분석하였으며, 이를 보완하기 위한 방안으로 AIS 동적정보 전송 주기의 변경을 제안하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.48-50
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• 2023

울산항 해상교통관제센터(VTS)에서 수신한 AIS 데이터를 이용하여 울산항 출입하는 선박의 MMSI 정보를 분류하였다. 분류된 MMSI 정보는 웹 크롤링을 통하여 선박의 종류, 국적, 총톤수, 길이, 폭 등을 데이터를 수집하였다. AIS 데이터와 MMSI의 선박 정보를 이용하여 출입하는 선박의 선종별 운항 경로 궤적을 분석하였다. 분석된 데이터는 선박 도선 및 항내 안전항로 유도에 활용하고자 한다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.4
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• pp.345-351
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• 2013

The IWRAP program (Inland Waterway Risk Assessment Program) is a useful program for risk assessment of a waterway. However, in the basic version, the function which is used to import AIS data is not included. So users have to prepare the data and input to the program manually. And not all waterways have enough statistical data about passing vessels especially in developing countries as Vietnam. This paper studies the development of a program to pre-process AIS data for using the IWRAP Mk2 program basic version. In addition, it provides users basic information about marine traffic in a waterway such as routes layout, number of passages at a gate classified by type, size and time. The developed program, named TOAIS (Total AIS), was successfully used to pre-process AIS data collected in the Vung Tau waterway-Vietnam. As a result, the IWRAP Mk2 program basic version using data pre-processed from TOAIS could effectively assess the risk of collision in this waterway.

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

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.195-196
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• 2016

In the maritime mobile radiocommunication service, AIS(Automatic Identification System) devices are most widely using for the exchange of ship's navigational information. The AIS time slot usage increases due to increasing number of ships installed with AIS, and thus the reception rate of AIS data decrease. In order to mitigate this problem, international organizations recommend a sectorised receiving technique using directional antenna. This paper analyzed the sectorised receiving effectiveness of AIS data using Yaga antenna.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.351-353
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• 2013

AIS는 자체적으로 슬롯간 간섭을 방지할 수 있도록 하는 SOTDMA 통신 프로토콜을 주로 사용하여 데이터를 송수신하고 있다. 그러나 통신권이 서로 다를 경우 AIS 셀 간의 통신상태 정보를 공유하지 못하여 슬롯간 간섭이 야기될 수 있다. 본 연구에서는 AIS 데이터 수신현황을 분석하여 VTS 육상국에서 발생하고 있는 문제점을 제시하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.10a
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• pp.17-19
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• 2015

AIS는 데이터 송수신을 위하여 2개의 채널을 사용하고 있으며, 채널 당 2,250개의 시간 슬롯으로 분할하여 사용하는 시분할 다중화 방식을 적용하고 있다. 특히 AIS에서 주로 사용하고 있는 SOTDMA 프로토콜은 데이터를 전송하기 위한 시간 슬롯을 예약하고 예약된 슬롯 정보를 공유함으로써 슬롯 간섭을 피하고 있기 때문에 슬롯의 사용 상태는 매우 중요하다. 여기에서는 해발고가 높은 우리나라 주요 AIS 기지국의 슬롯 점유율과 슬롯 점유율에 영향을 미치는 수신 메시지 비율 및 통신 거리 분포 등에 대하여 분석하였다.