• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.04a
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• pp.265-268
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• 2004

At these days, electronic maritime chart is in positively using various fields. But most of electronic maritime chart and topography information system is hard to using various fields despite that demand because that difficult approach from separately and specific constitution. This thesis apply to image filtering that extract requirement topography data from simplification of the whole system. And as constructing database of simple structure that getting various information from sounding depth and existing database, propose electronic maritime chart system to practicable 3D embodiment. And also propose convenience and commonplace to simple process about frequently renewal.

• Journal of IKEEE
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• v.22 no.3
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• pp.800-804
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• 2018

This paper presents a novel HF band differential quadrature phase-shift keying (DQPSK) orthogonal frequency-division multiplexing (OFDM) communication system. The system can deliver 3.6 kbps with a bandwidth of about 3 kHz. In a digital modem, OFDM with 32-point fast Fourier transform is used. In the system, each subcarrier uses DQPSK modulation. Hence, a demodulator does not require carrier phase recovery and symbol timing recovery. And, each subcarrier employs CRC error check code individually. By using CRC code for each subcarrier, bit error caused by multipath fading can be recovered simply.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.03a
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• pp.240-247
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• 2010

The soil nailing system is becoming common as reinforcement method of slope face in soil. It has application to obtain slope stability method and scaffolding system. It has some troubles when the soil nailing system is applied to the downtown because it could be invaded someone's private area. Thus, in this paper, wedge type removable soil nailing system which can easily remove deformed bar in final excavation step is developed. Field pull-out test is performed to evaluate deformed bars removal and pullout resistance characteristics. According to this result, application of Wedge Type Removable Soil Nailing System is performed.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.333-339
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• 2010

본 연구는 제연구역 출입문의 자동폐쇄장치를 개발하기 위한 기초 연구로서, 자동폐쇄장치의 프로세스와 자동폐쇄조절장치의 기구학적 메커니즘 정립 및 기구 모델링을 바탕으로 자동폐쇄장치의 해석이론을 정립하였고, 해석이론을 바탕으로 한 운동해석 시뮬레이션을 통해 폐쇄력 장치를 선정하고 자동폐쇄조절장치의 각 요소를 개발할 수 있는 엔지니어링 데이터 구축과 원천기술을 확립하였다. 자동폐쇄장치의 개발에 유연성과 탄력성을 줄 수 있고, 자동폐쇄장치의 개발로 인해 연기의 제어수단과 기술적 대책마련과 제연시스템의 높은 신뢰성과 안정성을 확보할 수 있을 것으로 본다.

• Annual Conference of KIPS
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• 2012.04a
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• pp.858-859
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• 2012

해상에서의 데이터는 디지털 수로데이터 교환 표준인 국제수로기구(IHO, International Hydrographic Organization)의 S-57을 기반으로 제작된다. 그러나 S-57은 지리정보 외의 정보를 표현하는데 한계를 나타내었다. S-57의 한계를 극복하기 위하여 다양한 해양데이터를 활용할 수 있는 시스템 체계로 수로 데이터를 위한 데이터 모델과 규격을 정의하는 S-100을 제정하였다. S-100을 기반으로 하여 수로데이터를 위한 표준으로 S-101을 제정하고 있으며, 데이터 검색 및 활용을 위한 메타데이터도 포함하여 구성하였다. S-101의 개발에 따라 S-57전자해도를 S-101전자해도로 변환이 요구되고 있으며, 이와 함께 메타데이터에 대한 변환도 필요하다. 본 논문에서는 S-57의 메타데이터 요소와 S-101의 메타데이터 요소를 비교 분석하여 메타데이터 변환모델을 제시하였다.

• Annual Conference of KIPS
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• 2024.05a
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• pp.207-209
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• 2024

딥러닝은 선형 연산과 비선형 연산을 조합하여 목표로 하는 시스템을 잘 표현할 수 있는 함수를 찾기 위해 사용하며, 이미지 분류 및 생성, 거대 언어 모델 및 객체 인식의 영역에서 활발하게 사용되고 있다. 그러나 딥러닝 연산을 위해서는 모델과, 연산을 수행하고자 하는 데이터가 하나의 공간에 저장되어야 한다. 모델과 데이터를 데이터 소유자가 관리할 경우, 데이터 소유자가 모델 데이터의 프라이버시를 침해할 수 있으며, 이는 모델을 적대적 예제 생성 공격에 취약하도록 만드는 원인이 된다. 한편 모델과 데이터를 모델 소유자가 관리할 경우, 모델 소유자는 데이터의 프라이버시를 침해하여 데이터 소유자의 정보를 악의적으로 이용할 수 있다. 본 논문에서는 딥러닝 모델과 데이터의 프라이버시를 모두 보호하기 위해 주어진 딥러닝 모델의 암호화와 복호화를 수행하는 EncNet 을 구현하였으며, MNIST 와 Cifat-10 데이터셋에 대하여 실효성을 테스트하였다.

• Journal of Korean Society for Geospatial Information Science
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• v.11 no.3 s.26
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• pp.13-21
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• 2003

Although more than 90% of the yearly freight has been made through shipping the positioning system for the ships and cargos to support effective transportation of the freights has not been established yet. The government has been working on developing such a positioning system in many perspectives. The main problem in building a such system is that individual shipping companies are running different types of system and databases. This would cause duplicated investment with wasting money and time and this becomes an obstacle to the easier information sharing. Therefore, this study has mainly demonstrated developing a manager's system in the positioning system for the ships and cargos based on client-server scheme using electronic nautical charts on which the international standards are already available. In addition, this study also proposed an independent system which can be used in the ports with different locations thereby preventing duplicated investments.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.12
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• pp.2126-2131
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• 2006

This paper proposes an international trend and its implementation for an E-Navigation that can utilize of existing and new navigation tools, in particular electronic tools, in a holistic and systematic manner. IMO develops a broad strategy for incorporating the use of new technologies in a structured way to ensure that their use is compliant with the various electronic navigational and communication technologies and services that are already available. Implementation of this new strategic vision might require modifications to working methods and navigational tools, such as chats, bridge display equipment, electronic aids to navigation, communications and shore infrastructure. E-Navigation will reduce navigational accidents errors and failures by developing standards an accurate and cost effective system.

• Journal of the Korean Society for Marine Environment & Energy
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• v.3 no.1
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• pp.45-51
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• 2000

The more larger and heavier the ship, the more accidents happen in the ocean and coastal area. The IMO, IALA and ITU finalized the technical standardization process regrading performance standard and technical characteristic of Universal Ship-borne AIS. Korean government are going to setup AIS system in the coastal area in three years. To construct AIS service efficiently in Korean water, The authority should consider requirements about several things. This paper presents the consideration of our domestic AIS in view of investigation of international standard and requirements of ours.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.2
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• pp.197-208
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• 2022

The existence of shallow bedrock and the desire to use underground space necessitate the use of blasting methods. The standard blasting method under water after drilling is associated with certain technical difficulties, including reduced detonation power, the use of a fixed charge per delay, and decoupling. However, there is no blasting method to replace the existing blasting method. In this paper, a dry hole charged with ANFO blasting is assessed while employing a dry hole pumping system to remove water from the drill borehole. Additional standard blasting is also utilized to compare the blasting performances of the two methods. The least-squares linear regression method is adopted to analyze the blasting vibration velocity quantitatively using the measured vibration velocity for each blasting method and the vibration velocity model as a function of the scaled distance. The results show that the dry hole charged with ANFO blasting will lead to greater damping of the blasting vibration, more energy dissipation to crush the surrounding rock, and closer distances for the allowable velocity of the blasting vibration. Also, standard blasting shows much longer influencing distances and a wider range of the blasting pattern. The pilot test confirms the blasting efficiency of dry hole charged with ANFO blasting.