• 한국ITS학회:학술대회논문집
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• 2008.11a
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• pp.537-538
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• 2008

디지털 영상 기기의 발전과 함께 화질의 선명도와 해상도가 향상되면서 더 많은 영상 정보를 한 화면에 담고자 하는 시도로서 파노라마 영상 합성기법을 차량 주차시 운전자의 넓은 영상확보를 위해 구현한다. 본 논문에서는 파노라마 영상 생성 장치 및 방법과 파노라마 영상에 기반한 차량 후방 감시 장치에 관한 것이다. 차량 후방 감시용으로 두 대의 CCD 카메라 장비를 이용하여 촬영 기술상의 제한 또는 요구 없이 획득되는 영상 시퀀스로부터 영상을 분석하고 합성한다는 조건하에 수행되어지며, 카메라 움직임의 모델링, 변환식에 의한 합성 영상의 재구성, 후처리 기술을 접목한다. 첫 단계에서는 두 영상의 중첩 영역을 획득하고 두 번째 단계에서는 중첩된 영상을 기준으로 파노라마 영상을 구현하는 것이다.

• Journal of Advanced Navigation Technology
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• v.25 no.3
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• pp.242-247
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• 2021

Major countries in space field such as the United States, China and Russia have not only general ground-based space capabilities, but also maritime-based space capabilities. Maritime-based space systems include a maritime-based space surveillance system, a maritime-based space launch vehicle, and a maritime-based space information transmission system, and these maritime-based systems complement the ground-based space systems. Therefore, in this paper, we analyze the maritime-based space capabilities of major countries, and propose the future direction for south Korea's maritime-based space capabilities. The maritime-based space system is essential due to the geographical characteristics of south Korea, which has three sides of the ocean, and it is considered an one of important strategic element to become the seven major country in the space field.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.38-38
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• 2018

• Journal of Navigation and Port Research
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• v.30 no.3 s.109
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• pp.197-201
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• 2006

The AIS(Automatic Identification System) is the useful equipment in order to promote the maritime safety and real time monitoring at the sea. In this study, the plan to construct the ubiquitous Aids to navigation is proposed. In order to verify the construction of ubiquitous Aids to navigation, the experiment on the sea was carried out and analyzed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.258-260
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• 2018

해양관측부이는 해상에서 일어나는 기상현상, 해양의 변화 등을 관측하는 중요시설물로 주로 원거리 해상에서 운영되고 있다. 이러한 해양관측부이는 원거리에서 운영됨에 따라 Vandalism, 선박운항 부주의 등에 의하여 파손, 유실 등의 사고가 빈번하게 발생하게 되는데, 해양관측부이가 선박 충돌 등으로 인해 손상되면 운영여건 특수성에 의해 복구 및 교체 작업에 많은 시간과 비용이 발생하게 되며, 정위치 이탈 시 2차사고의 발생 위험성이 있다. 본 연구에서는 이러한 해양관측부이의 보호를 위하여 위성전송 파노라마 카메라 및 항로표지용 AIS 등의 장치를 활용하여 접근하는 선박을 감시하고, 상대 선박에는 위험경보를 인식하여 사고를 예방하며, 불가항력적인 사고 발생 시 운영자에게 이를 신속하게 알려 조기에 필요한 조치를 취하게 할 수 있는 방법과 시스템을 개발하였으며, 해당 시스템을 효율적으로 활용할 수 있는 방안을 제시하고, 개발한 시스템의 유용성을 검증한다.

• Journal of Navigation and Port Research
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• v.40 no.3
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• pp.159-164
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• 2016

The goal of this study is to implement a communication system that can monitor the status of the nacelle using the power cable itself, without the dedicated communication lines such as an UTP cable and optical fiber for the offshore wind turbine. An inductive coupling powerline communication system for a MW class offshore wind turbine was proposed and its communication performance was demonstrated. The inductive couplers was designed for operation at up to 500 A using a ferrite composite materials. Field test was carried out on the wind farms of Jeju island. Using the iperf communication test program, we have obtained more than 15 Mbps data transmission rate through the 100 m power cable that was installed between the nacelle and the bottom of the power converter. In the data transmission stability test for a week, there was no failure ever. The minimum transmission rate was 15 Mbps and the average data rate was about 20 Mbps. Next, we have installed an infrared camera inside the nacelle in order to measure the temperature distribution and variation of the nacelle. The real-time thermal image taken by the camera was successfully sent to the monitoring system without error.

• The KIPS Transactions:PartB
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• v.10B no.1
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• pp.95-102
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• 2003

In surveillance video system, there are many classes of images and some spatial regions are more important than other regions. The conventional compression method in this system have been compressed there full frames without classfying them depend on their important parts. To improve the accuracy of the image coding and deliver effective compression for the surveillance video system, it was necessary to separate the regions according to their importance. In this paper, we propose a new effective surveillance video image compression method. The proposed scheme defines importance based three-level region of interest block in a frame, such as background, motion object block, and the feature object block. A captured video image frame can be separated to these three different levels of block regions. And depends on the priority, each block can be modified and compressed in different resolution, compression ratio and qualify factor. Therefore, in surveillance video system, this algorithm not only reduces the image processing time and space, but also guarantees the Important image data in high quality to acquire the system's goal.

• Journal of Navigation and Port Research
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• v.33 no.6
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• pp.395-400
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• 2009

In order to prepare for the DGNSS recapitalization and implementation of the functions for software based reference station and integrity monitor (RSIM) system, this paper proposes a design of integrity monitor functions of maritime differential GPS RSIM. The most critical functions of the integrity monitor (IM) are to generate and send flags to the reference station (RS) along with system feedback. Firstly, it presents the architecture of software based RSIM, and analyzes the performance standard of integrity monitor for maritime DGPS reference station This paper then designs the functions of integrity monitor for DGPS reference station based on the performance standard. Finally, this paper presents the results of performance analysis for the functionality of integrity monitor using the GNSS simulator. it discusses the study method and its application for the system implementation.

• Journal of Navigation and Port Research
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• v.33 no.10
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• pp.685-690
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• 2009

International Maritime Organization (IMO) recommends the installation of an Automatic Identification System (AIS) according to requirements by SOLAS to avoid maritime collision. AIS provides traffic information of other ships that may be used for maritime traffic control, SAR (Search and Rescue) and collision avoidance to apply safety management. In this paper, preliminary results to implement an aeronautical surveillance transceiver using AIS transceiver based on ADS-B concepts are described. Although altitude information is not required for AIS since the AIS is operated at MSL (Mean Sea Level), altitude information can be extracted by a GPS (Global Positioning System) chip-set in the AIS transceiver. ADS-B transceiver is implemented by defining a surveillance message format including the altitude information and modifying SOTDMA (Self-Organizing Time Division Multiple Access) protocol. Ground tests and flight tests are performed to validate the implementation results.

• Journal of Navigation and Port Research
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• v.31 no.10
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• pp.905-910
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• 2007

As the ship is getting bigger and faster lately, ship's structure or cargoes might be often damaged and the ship might be cut in two in extreme conditions by a wave impact on its bow. In this paper, the vertical acceleration, which is one of factors for evaluating seakeeping performance, was measured under the various sea states by the hull stress monitoring system(HMS) on the bridge, and the result was compared with those of model test and theoretical studies. Then, we confirmed the seakeeping performance of T.S. HANBADA by comparing it with ITTC seakeeping criteria This result will be a great help for the safe navigation by making it possible to estimate the possibility of work and the amount of risk under the various sea conditions with which may be confronted, and the shipbuilding yard can be possible to construct the vessel with superior performance through these data measured on the actual ship.