• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.34 no.1
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• pp.79-90
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• 2016

The study has purposed in evaluating experiences for achievable accuracy and precision of time series at 3-D coordinates. It has been estimated from the kinematic medium-range baseline processing of Continuously Operating Reference Stations (CORS) for the potential application of crustal displacement analysis during an earthquake event. To derive the absolute coordinates of local CORS, it is highly recommended to include some of oversea country references, since it should be compromised of an observation network of the medium-range baselines within the length range from tens of kilometers to about 1,000 kilometers. A data processing procedure has reflected the dynamics of target stations as the parameter estimation stages, which have been applied to a series of experimental analysis in this research at the end. From the analysis of results, we could be concluded in that the subcentimeters-level of positioning accuracy and precision can be achievable. Furthermore, the paper summarizes impacts of satellite ephemeris, data lengths and levels of initial coordinate constraint into the positioning performance.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.4
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• pp.319-325
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• 2007

In case of more than 50km baseline length, the correlation between receivers is reduced. Therefore, there are still some rooms for improvement of its positional accuracy. In this paper, the stochastic modeling of the ionospheric delay is applied and its effects are analyzed. The data processing has been performed by constructing a Kalman filter with states of positions, ambiguities, and the ionospheric delays in the double differenced mode. Considering the medium or long baseline length, both double differenced GPS phase and code observations are used as observables and LAMBDA has been applied to fix the ambiguities. The ionospheric delay is stochastically modeled by well-known 1st order Gauss-Markov process. And the correlation time and variation of 1st order Gauss-Markov process are calculated. This paper gives analyzed results of developed algorithm compared with commercial software and Bernese.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.31-40
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• 2017

This paper deals with the high precision of GPS measurement reduction and its implementation on near real-time and kinematic mode for those applications requiring centimeter-level precision of the estimated coordinates, even if target stations are a few hundred kilometers away from their references. We designed the system architecture, data streaming and processing scheme. Intensive investigation was performed to determine the characteristics of the GPS medium-range functional model, IGS infrastructure and some exemplary systems. The designed system consisted of streaming and processing units; the former automatically collects GPS data through Ntrip and IGS ultra-rapid products by FTP connection, whereas the latter handles the reduction of GPS observables on static and kinematic mode to a time series of the target stations' 3D coordinates. The data streaming unit was realized by a DOS batch file, perl script and BKG's BNC program, whereas the processing unit was implemented by definition of a process control file of BPE. To assess the functionality and precision of the positional solutions, an experiment was carried out against a network comprising seven GPS stations with baselines ranging from a few hundred up to a thousand kilometers. The results confirmed that the function of the whole system properly operated as designed, with a precision better than ${\pm}1cm$ in each of the positional component with 95% confidence level.

• The Journal of Internal Korean Medicine
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• v.19 no.2
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• pp.17-27
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• 1998

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.20 no.6
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• pp.20-31
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• 2002

• Economic and Environmental Geology
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• v.52 no.5
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• pp.409-425
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• 2019

Marine terraces, a step-like landform, are important geologic markers that provide tectonic information during the Quaternary Period. Marine terraces are well developed along all coastlines(East, West, and South) of the Korean Peninsula, those along the East coastline are the most distinctive. The marine terraces of the East coastline are classified into 4-6 flights that are several meters or several tens of meters above the present sea level. It is believed that these terraces, except for the lowest one, were formed in the middle Pleistocene. In the base of the OSL age dating results and Blake excursion events of magnetostratigraphy, the $2^{nd}$ and $3^{rd}$ terraces are correlated to the last interglacial stage. Considering the marine terraces linked to a sea-level curve of the Pleistocene, it is thought that regional tectonic movements have uplifted the East coastal area since the middle Pleistocene. Besides, former shorelines of each terrace have varied elevations from Gangreung to Busan bay, which can be divided into four regions, namely, Gangreung-Yonghanri(I), Homikot-Najung(II), Najung-Bangeojin(III), and Waesung-Busan Bay(IV). The former shorelines of each terrace at both Gangreung-Yonghanri(I) and Najung-Bangeojin(III) are higher than those in the other two regions, due to block movements by regional faults such as the Ocheon Fault or its subsidiaries, the Gampo Lineament and Ulsan Fault. Uplift rate of the East coast ranges from 0.2 m/ky to 0.3 m/ky, but each region shows different uplift rate.

• Proceedings of the Costume Culture Conference
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• 2003.09a
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• pp.25-26
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• 2003

본 연구는 고려중기이후부터 조선시대에 왕이하 서인에 이르기까지 착용하였던 철릭에 대한 것이다. 철릭의 형태는 상하가 연결되고 허리에 주름이 잡혀 있으며, 소매는 단추로 떼었다 붙였다 할 수 있도록 되어 있다. 연구는 문헌자료를 중심으로 조선시대 착장자의 신분과 용도를 살피고, 단국대학교 석주선 기념박물관에 소장된 출토유물 중 측정이 가능한 68점을 실측하여 바느질법과 특징을 분석하였다. (중략)

• Proceedings of the Korean Society of Disaster Information Conference
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• 2017.11a
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• pp.205-206
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• 2017

도로교통공단 교통사고 분석시스템(TAAS)에 따르면 2016년 기준 전체사고의 약 11%가 고령운전자 사고이며, 고령운전자 사고로 인한 사망자수는 759명에 달한다. 본 연구에서는 고령운전자의 신체적 특징을 감안하여 전기(65세~74세), 중기(75세~84세), 후기(85세 이후)로 나누고 로지스틱 회귀분석을 이용하여 고령운전자의 연령대별 사고특성과 사망사고에 영향을 미치는 요인을 파악하고 그 특성을 고려한 안전대책을 제시하고자 하였다. 분석결과 차량단독사고일 때 고령자 전 연령대에서 사고위험도가 높게 나타났으며, 도로이탈로 인한 사고인 경우 다른 사고요인에 비해 위험도가 높게 나타났다. 사고원인별로 살펴보면 안전운전의무 불이행, 중앙선침범으로 인한 사고인 경우가 높았으며, 기상상태별로 볼 때 전기고령자에서 중기, 후기 고령자로 갈수록 흐릴 때의 사고위험도가 높아지는 것으로 나타났다.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.733-737
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• 2004

오랫동안 연구되어 오던 전력선 통신 기술은 1990 년대 중반에 이르러, 모뎀 기술을 응용한 10kbps급의 저속 전력선통신 기술이 개발되어 상용화 수준에 근접한 제품이 등장하기 시작했다. 반면 고속 전력선통신 기술 분야는 관심을 갖기 시작한 시기가 저속 분야에 비해 상대적으로 늦지만, 국내외 여러업체에서 고속 전력선통신 솔루션을 개발, 상용화에 근접한 칩셋 및 제품들을 선보이고 있다. 국내에서는 산업자원부의 중기거점 사업으로 수행중인 "50Mbps급 고속 전력선 통신망 개발사업"과 관련하여 고속 전력선 통신망 장치를 실용화 할 수 있도록 집단주택과 단독주택 형태의 인터넷 시범사업에 관한 연구가 활발히 수행중이다. 본 연구에서는 실제 수용가 환경인 단독주택 약 20세대에서 수행한 인터넷 시범사업을 통하여 개발된 전력선 통신 모뎀과 시스템에 대한 성능 측정을 수행한다. 이를 토대로 현 단계에서의 기술을 분석하고, 전력선 통신망에 대한 운영상의 적정 노드 및 가입자망 전송 섹터범위 등의 종합적인 평가에 대한 내용 등 실증시험망 구축 및 운용에 대한 결과와 향후 활용방안에 대해서 기술하고자 한다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1995.05a
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• pp.25-29
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• 1995

＊병인,신미양요(1866-1871) : 기선, 화륜선이 조선연안을 나타났음. ＜셔어먼호＞사건 ; 대동강 소항중 조선의 포화맞다 ＊강화도조약 (1876년) : 조선의 문호개방--서양선박에 의한 교이(인천,부산,원산 개항) 방곡령의 선포(1889)--일상인의 미곡반출(수탈) 기선, 해룡호둥 용선(조운-1886),인천-한강나루간 수운 수공업제 공장의 동력도입(정미소-중기동력의 효시-1889) 형식 ; 석구식, 기계식(중략)