• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.218-219
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• 2022

The Korea Institute for Advancement of Technology and the Ulsan ICT Promotion Agency are building an electric smart ship using a full range of ICT with advanced technology, and are expected to demonstrate it in 2022. For the demonstration of onboard ship equipment, it needs to develop a demonstration procedure. There are 4 types of onboard equipment preferentially selected for the development of the demonstration test procedure which are an electronic chart display and information system, a ship RADAR system, a voyage data recorder, and a ship energy efficiency monitoring system. This paper describes the demonstration procedure based on the equipment standard for the electronic chart display and information system among 4 selected types of demonstration equipment, and also the verification test checklist and template is introduced.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.12
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• pp.1267-1279
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• 2014

In this paper, we suggest the development of object detection systems for the safety of the ship through the study of the properties of short-range radar. Many of the short-range radars developed for special purpose like cars has cheaper price advantages but it is not proper to every application. In order to overcome such obstacles we need to analysis data from experiments in various environments and feature analysis of the device is essential. Also, the data clustering algorithms to display correct classified moving objects is necessary. In this paper we propose the advanced fast moving object detection system using short range radars with better detection accuracy. And we proposed a clustering algorithm using the value of the RCS and the speed and trajectory information of the radar data that are reflected.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.48 no.3
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• pp.227-234
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• 2012

This paper describes the remote monitoring of breaking ocean waves generated by Typhoon Nabi, whose name means butterfly in Korean, using a marine X-band radar in the Yongho Man, Busan, Korea. The basic purpose of this study is to investigate the dynamic behavior and to estimate the periods of breaking waves across the surf zone from radar image sequences. In these experiments, the land-based radar system imaged the inshore zone of three miles from the coastline to a isobath of 30 meters. The wave period and the dominant wave direction for breaking ocean waves extracted directly from radar image sequences were 157.4 meters and 298 degrees, respectively. However, the result calculated quantitatively by the continuous wavelet transform (CWT) showed that the period of breaking waves was 154.3 meters. The average difference in breaking wave periods between the value extracted by using EBRL (electronic bearing and range line) of radar and the calculated value by CWT was 3.1 meters, showing that the CWT method is also accurate. These results suggest that a marine X-band radar system is a viable method of monitoring the breaking ocean waves.

• Electronics and Telecommunications Trends
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• v.27 no.1
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• pp.74-85
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• 2012

차세대 화합물 반도체 플랫폼으로 각광을 받고 있는 GaN 전자소자 글로벌 연구개발 동향에 관하여 기술하고자 한다. GaN 전자소자는 와이드 밴드갭(Eg=3.4eV)과 고온 안정성($700^{\circ}C$) 등 재료적인 특징으로 인하여 고출력 RF 전력증폭기와 고전력용 전력반도체 응용에 큰 장점을 가진다. GaN 전자소자 기술동향에서는 먼저 미국, 유럽, 일본을 중심으로 한 대형 국책 연구프로젝트 분석을 통한 RF 전력증폭기 연구개발 방향을 살펴보고, 후반부에서는 이동통신 기지국, 선박 및 군용 레이더 트랜시버용 고출력 RF 전력증폭기의 응용 분야에 관하여 알아본다. 이러한 총체적인 동향분석을 통하여 차세대 반도체의 신시장 개척과 선진입을 위한 GaN 전자소자의 연구개발 방향과 조기상용화의 중요성을 함께 생각해보고자 한다.

• Information and Communications Magazine
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• v.16 no.9
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• pp.28-41
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• 1999

위상배열 안테나 시스템에서 빔 제어 기술은 이동통신 및 위성통신시스템, 비행하고 있는 임의의 비행체의 위치를 고도의 정확도를 가지고 추적하는 군사용 레이더 시스템이나 항공사의 통신 시스템, 선박이나 차량간의 충돌을 방지하기 위한 충돌방지 시스템 등에서 널리 사용되고 있다. 이러한 위상배열 안테나 시스템에서 위상천이기를 이용하는 방법이 널리 사용되고 있다. 이 방법은 원리적으로 간단하지만 실제 구현할 때 위상천이기를 제어하기 위한 제어 신호와 DC 바이어스 라인들 그리고 전력분배기로 구성되어 있기 때문에 전체 회로가 복잡해진다. 뿐만 아니라 현재로서는 위상천이기의 가격과 삽입 손실 때문에 저렴하고 높은 이을 갖는 위상 배열 안테나 시스템을 구현하기가 힘들다. 본 논문에서는 위상천이기를 사용하지 않고 발진기들의 결합을 이용함으로써 이와 같은 단점을 극복하면서 배열 안테나의 복사 빔을 제어할 수 있는 결합발진기 배열 안테나의 최근 기술동향을 분석하고 여러 기술들의 장단점을 기술한다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.17 no.2
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• pp.131-136
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• 2011

The furrow calculation and traffic measurement of sailing ship using computer vision are useful methods to prevent maritime accident by predicting the possibility of an accident occurrence in advance. In this paper, sailing ships are recognized using image erosion, differential operator and minimax value, which can be verified directly because the calculated coordinates are displayed on electronic navigation chart. The developed algorithm based on area information of this paper has the advantage which is compared to the conventional radar system focused on point information.

• Journal of Navigation and Port Research
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• v.28 no.6
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• pp.497-501
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• 2004

In this paper, it is presented a level sensor for measuring a level of the contents of cargo tank using frequency modulated continuous wave(FMCW). The frequency range is 10∼11 GHz, the radar cross section(RCS) of test target is $0.8\textrm{m}^2$ of metal plate. The experiment is performed in laboratory and open ground, the sweep time of the signal is 100 ms, the pyramidal horn antenna of about 22 dBi gain is used, and input power of antenna is about 8 dBm The beat frequency according to the target moving to 40 m is measured. There is a good agreement between measured and calculated results. But the resolution of the FMCW radar is measured about 10 cm due to nonlinear of voltage controlled oscillator(VCO).