• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.792-795
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• 2014

매년 고속도로 교통사고로 많은 사람이 목숨을 잃고 있으며 이 중 1차 사고에 이은 2차 충돌사고로 인한 교통사고는 전체 고속도로 교통사고의 14%이며, 치사율은 50%에 이른다. 본 논문에서는 고속도상의 2차 충돌사고 예방을 위한 실시간 사고 정보 분석 및 알림 기술을 제안한다. 제안 기술은 블랙박스와 내비게이션 길 안내 기술, 교통정보 및 센서를 활용한 사고 인식 기술, 통신형 내비게이션 및 위치 공유 기술 그리고 사고 정보 알림 기술을 바탕으로 현재 주행 중인 고속도로의 정보를 종합적으로 인식하여 사고 및 정차를 판별하여 사용자에게 알려줌으로써 2차 충돌사고를 예방한다.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.3
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• pp.290-295
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• 2011

On the basis of DCPA(Distance to Closest Point of Approach) and TCPA(Time to CPA), the conventional algorithms for collision avoidances have a drawback that the '72 CORLEGs(International Regulations for Preventing Collisions at Sea, 1972) has not taken into account to prevent collisions between ships. In this paper, the proposed algorithm decides whether the own ship is a give-way vessel or a stand-on vessel by observing the relative bearing of the encountered ship. To determine the ship position and time for collision avoidance, the proposed algorithm utilizes the ellipse model for ship safety domain. The computer simulation is done to represent the process of adversive behavior. Using the proposed method, the past maritime accident is analyzed. The proposed method can be effectively applied to collision avoidance by CORLEGs even when the target ship's navigational lights is invisible in poor weather and/or in the restricted visibility.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.1
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• pp.1-8
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• 2019

In December 2017, many collision accidents of small vessels, such as those between oil refineries and fishing boats, occurred near Yeonghung-do in Incheon. In order to prevent marine casualties from small vessels, the government is striving to improve the safety capabilities of ship operators by strengthening education and improving the working environment. They are providing education and refining training regulations for fishermen operating vessels under 5 tons. However, the situation includes certain vulnerabilities. In this study, we propose a collision prevention algorithm for small vessels using the Wireless Access in Vehicular Environments (WAVE) communication system, which is a new communication technique to prevent collisions with small ships. The collision avoidance algorithm used is based on DCPA/TCPA. Research analyses, simulation experiments and questionnaires have been conducted to define the criteria of DCPA/TCPA. As a result, the standard for DCPA was $8(L_a+L_b)$ and for TCPA was 2.5 min. Three different accident cases were selected, and this algorithm was applied to confirm alarm responses at certain times. This algorithm can provide information to the operators of small ships in advance to help them recognize potential collision situations.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.44-44
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• 2020

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.1
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• pp.44-51
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• 2023

The Convention on the International Regulations for Preventing Collisions at Sea, 1972 (COLREGs) was adopted to prevent ships from colliding with other ships or any object such as the seabed. COLREGs have been codified and refined since the mid-19th century, and have reached the present. Therefore, the terms and sentences used in COLREGs also have distinct academic and legal connotations. However, in the Maritime Safety Act of the Republic of Korea, which translated COLREGs into domestic law, the "risk of collision" and the "danger of collision" was used in the law without distinguishing their meanings. Accordingly, the difference between "risk" and "danger" was analyzed with reference to the definition of risk by an authoritative international organization of the United Nations such as the International Maritime Organization and the International Organization for Standardization as a well-known and authoritative non governmental organization. In addition, the cases codified in COLREGs and translated cases in the Maritime Safety Act were analyzed to highlight the need for amending the Maritime Safety Act. From the perspective of safe navigation, it is expected that the Maritime Safety Act in the future would distinguish between "danger" and "risk" so that the efforts of watch officers to prevent collisions could be further systematized.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.3
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• pp.747-754
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• 2013

This paper proposed a new transponder detection method to reduce tag recognition time and simplify anti-collision process in RFID systems. In conventional systems, a transponder in detectable area is passively recognized by responding to a reader command. In addition, if there are multiple tags in the area, a collision between tags occurs by responding at the same time to a command and anti-collision process begins. In the proposed method, tags are actively recognized without any command from a reader which results to reducing a tag recognition time and simplifying anti-collision process. To compare transponder recognition time, the process of transponder recognition in conventional systems is analysed. A circuit to detect transponder directly is developed and antenna voltage variation of a reader in the appearance of multiple transponders is analysed for the implementation of the proposed method.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.815-817
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• 2012

본 논문에서는 차량 충돌 예방 레이더 시스템-온-칩용 77GHz 고주파 전단부(RF front-end)를 제안한다. 이러한 고주파 전단부는 77GHz의 동작주파수를 가진 저 잡음 증폭기와 고주파 전력 증폭기로 구성된다. 이러한 회로는 TSMC $0.13{\mu}m$ 혼성신호/고주파 CMOS 공정 ($f_T/f_{MAX}=120/140GHz$)으로 설계되어 있다. 저잡음 증폭기의 경우 전압이득이 36dB로 최근 발표된 연구결과 중 가장 우수한 수치를 보였다. 전력 증폭기는 포화전력과 출력 $P_{1dB}$이 18dBm과 15dBm으로 기존 연구결과 중 가장 우수한 결과를 각각 보였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.766-767
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• 2013

본 논문에서는 차량 충돌 예방 레이더 시스템-온-칩용 24GHz 믹서(Mixer)를 제안한다. 이러한 회로는 24GHz의 동작주파수를 가지며, Gilbert 셀 구조로 구성된다. 이러한 회로는 TSMC $0.13{\mu}m$ 혼성신호/고주파 CMOS 공정 ($f_T/f_{MAX}=120/140GHz$)으로 설계되어 있다. 제안한 회로는 10.96dB의 변환이득으로 최근 발표된 연구결과 중 가장 우수한 수치를 보였다. 또한 7.62dBm의 우수한 IIP3의 특성과 -43.64dB의 입력/출력 반사손실 (S11/S22) 및 -49.3dB의 LO-RF간 격리 특성 (S12)으로 기존 연구결과 중 가장 우수한 결과를 각각 보였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.708-709
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• 2013

본 논문에서는 차량 충돌 예방 레이더 시스템-온-칩용 24GHz 믹서(Mixer)를 제안한다. 이러한 회로는 24GHz의 동작주파수를 가지며, Gilbert 셀 구조로 구성된다. 이러한 회로는 TSMC $0.13{\mu}m$ 혼성신호/고주파 CMOS 공정 ($f_T/f_{MAX}=120/140GHz$)으로 설계되어 있다. 제안한 회로는 10.96dB의 변환이득으로 최근 발표된 연구결과 중 가장 우수한 수치를 보였다. 또한 7.62dBm의 우수한 IIP3의 특성과 -43.64dB의 입력/출력 반사손실 (S11/S22) 및 -49.3dB의 LO-RF간 격리 특성 (S12)으로 기존 연구결과 중 가장 우수한 결과를 각각 보였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.329-331
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• 2013

해양사고의 주된 원인이 인적과실로 인한 충돌사고임에도 현재의 교육 프로그램에는 이러한 인적과실을 예방할 수 있는 내용이 포함되어 있지 않으며, 시뮬레이터를 활용한 실습교육도 매우 부족한 편이다. 본 연구에서는 상급해기사에 비해 상대적으로 시뮬레이터를 활용한 실습교육이 부족한 하급해기사의 교육을 위해 충돌사고를 예방할 수 있는 기초적 훈련이 가능한 데스크탑 기반의 보급형 교육훈련 시뮬레이터 개발내용을 소개하고자 한다.