• Spatial Information Research
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• v.15 no.4
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• pp.363-370
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• 2007

This study has been carried for the development of the basic algorithm of helicopter navigation system based on TRN (Terrain Referenced Navigation) with information input from the GPS. The helicopter determines flight path due to Origination-Destination analysis on the Cartesian coordinate system of 3-D DTM. This system shows 3-D mesh map and the O-D flight path profile for the pilot's acknowledgement of the terrain, at first. The system builds TCF (terrain clearance floor) far the buffer zone upon the surface of ground relief to avid the ground collision. If the helicopter enters to the buffer zone during navigation, the real-time warning message which commands to raise the body pops up using Matlab menu. While departing or landing, control of the height of the body is possible. At present, the information (x, y, z coordinates) from the GPS is assumed to be input into the system every 92.8 m of horizontal distance while navigating along flight path. DTM of 3" interval has been adopted from that which was provided by ChumSungDae Co., Ltd..

• Journal of Positioning, Navigation, and Timing
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• v.8 no.2
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• pp.79-85
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• 2019

The mission tasks of polar exploration utilizing unmanned systems such as glacier monitoring, ecosystem research, and inland exploration have been expanded. To facilitate unmanned exploration mission tasks, precise and robust navigation systems are required. However, limitations on the utilization of satellite navigation system are present due to satellite orbital characteristics at the polar region located in a high latitude. The orbital inclination of global positioning system (GPS), which was developed to be utilized in mid-latitude sites, was designed at $55^{\circ}$. This means that as the user is located in higher latitudes, the satellite visibility and vertical precision become worse. In addition, the use of satellite-based wide-area augmentation system (SBAS) is also limited in higher latitude regions than the maximum latitude of signal reception by stationary satellites, which is $70^{\circ}$. This study proposes a local-area augmentation system that additionally utilizes Global Navigation Satellite System (GLONASS) considering satellite navigation system environment in Polar Regions. The orbital inclination of GLONASS is $64.8^{\circ}$, which is suitable in order to ensure satellite visibility in high-latitude regions. In contrast, GLONASS has different system operation elements such as configuration elements of navigation message and update cycle and has a statistically different signal error level around 4 m, which is larger than that of GPS. Thus, such system characteristics must be taken into consideration to ensure data integrity and monitor GLONASS signal fault. This study took GLONASS system characteristics and performance into consideration to improve previously developed fault detection algorithm in the local-area augmentation system based on GPS. In addition, real GNSS observation data were acquired from the receivers installed at the Antarctic King Sejong Station to analyze positioning accuracy and calculate test statistics of the fault monitors. Finally, this study analyzed the satellite visibility of GPS/GLONASS-based local-area augmentation system in Polar Regions and conducted performance evaluations through simulations.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.34 no.1
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• pp.9-13
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• 2011

The purpose of this study was to investigate the effects of the secondary tasks such as sending text message (STM) and searching navigation (SN) on skin conductance level (SCL) and deviation of vehicle speed during driving. The participants included 30 healthy adults; 14 males aged $25.2{\pm}0.9$ with $1.9{\pm}1.8$ years of driving experiences and 16 females aged $22.6{\pm}1.9$ with $1.2{\pm}0.8$ years of driving experiences. All subjects were instructed to keep a constant speed (80km/h or 100km/h). SCL and deviation of vehicle speed were measured during driving only and driving with secondary tasks. SCL and deviation of vehicle speed were more increased during the driving with secondary tasks than driving only. Secondary tasks increased an activation of sympathetic nerve system and decreased driving performance. However, there were no significant differences in the SCL and deviation of vehicle speed according to gender and speed.

• Journal of Advanced Navigation Technology
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• v.15 no.5
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• pp.879-886
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• 2011

Warning notification system base on mobile communication providers, is a warning information provider which senses the disaster and warning condition, provides the warning message to the entrepreneur and its mobile terminal. In this paper, for protecting our lives and properties, we study on disaster warning system ISO TC233's WG3's Public Warning model, Korea Disaster Forecasting and Warning System, disaster Forecasting and Warning System's role, and Colour-coded Alert etc.

• Journal of Advanced Navigation Technology
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• v.17 no.1
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• pp.47-55
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• 2013

In this paper, we propose the micropayment model based on NFC, authentication, and privacy technique to support micro-payment in aspect of information technology to reinvigorate the traditional market. The micropayment model supports facilities of payment using smart phone based on NFC, and the encryption and tokenization support the functions of MD authentication, indirection authentication, and privacy of user's payment.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2002.03a
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• pp.89-99
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• 2002

Since 1996, the document exchange method by EDI has been introduced in port and logistics industries in Korea to enhance the declaration activities to the Pusan Port Authority and Customs. In spite of these efforts, users such as shipping companies, shipping agents, and freight forwarders have complained the inconvenience of using EDI systems. The major reasons can be summarized as follows: repetitional EDI transfer, too much transfer time, inconvenient EDI software, and problems on message receiving confirmation. Furthermore, EDI has been used only for transmitting messages. To solve these problems, this study has adopted the integration system by applying the concept of SCM to logistics system by XML/EDl. In the view of SCM, the existing EDI has some problems because its role is only to transmit the messages. This paper is to suggest how current EDI systems in Port and logistics sector has to be chanced by Introducing SCM. The integration system gives us such advantages as accuracy of cargo data, integration of processes among firms, and keeping the trace of cargo.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.535-537
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• 2009

For decreasing the maritime pollution accident of the large material(crude oil, ore and so on) carrier, as we construct the Virtual AtoN AIS utilizing the existing AIS Base Station in the area of major route, passage way and danger or in case of emergency danger, it can help the normal vessel to pass the area without any obstacles and inform the danger elements to AIS. ECDIS and radar of the large carrier.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.251-252
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• 2009

본 논문에서는 AIS의 표준 메시지 포맷과 사양을 확장하여 선박의 항해안전을 향상시키고 AIS시스템의 활용을 극대화할 수 있는 AIS 데이타 응용 포맷과 사양을 개발하여 제안하였다. 그리고 국내에서 적극적으로 활용되기 위해서 필요한 6비트 체계를 사용하는 AIS통신에서의 한글메시지의 구현방안을 제시하여 메시지의 한글화 및 단말기의 한글화 방안도 마련하였다. 테스트 결과 개발된 포맷들은 여객선의 운항관리나 교통방송, 어선의 입출항 및 어획량 보고, NAVTEX정보, 구난정보, 기상정보등을 전송할 수 있게 되어 그 활용범위는 광범위하고 특히 GPS플로터나 ECDIS같은 전자해도 기반의 항해시스템과 연동되면 선박의 해양사고 발생을 미연에 방지함은 물론 해상교통안전 향상 및 사고취약선박에 대한 안전향상에 큰 도움이 될 것으로 기대된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.19-20
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• 2023

IALA Guideline 1132 is intended to assist authorities in implementing the procedures described in IALA Recommendation R1012: VTS Communications with the objective of harmonizing VTS communications through the use of standard message structure and phraselogly. For this reason, it is recommended that VTS Authorities put adequate procedures in place to ensure its consistent and correct implementation for the actual VTS operation as is now being considered in IALA as part of the VTS English language proficiency test. In light of the 2022 publication of IALA Guideline 1132: VTS Voice Communications and Phraseology, in this sense, the potential evaluative variables will be studied in the context of this presentation.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.440-442
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• 2006

This rarer is to design a low cost GPS/DGPS receiver using GP2021 correlator. By modifying the existent GPS, the performance can be enhance than before. The H/W and S/W should be updated to have good result.