• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.66-70
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• 1999

In this paper we explored a framework on technical regulations of telecommunication in UK. and pointed out essental element of thier success. After exploring the trend of UK, we also provide some policy suggestion on buiding of technical regulations of telecommunications in Korea

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.778-778
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• 2012

수문조사시설 중 하나인 영점표고검정수준점은 장기간의 시간 경과에 따른 하천 수문관측 환경변화로 망실 및 침하 등으로 인한 신뢰도가 저하되고 있는 것이 현실이다. 수위표 영점표고는 일반적으로 하상부터 자유수면의 높이까지를 일컫는 수위에 대한 기준 높이가 되는 값으로 영점표고의 변동은 수위의 변동을 초래하기 때문에 관측된 수위의 시계열 연속성을 확보하기 위해서는 영점표고검정수준점의 신뢰도가 대단히 중요하다. 따라서 본 연구에서는 수문자료에 직접적인 품질에 영향을 줄 수 있는 영점표고검정수준점에 대하여 체계적이고 전문적인 공공측량을 실시하였으며, 왕복수준측량 과정에서 발생할 수 있는 오류 및 오차를 검증하기 위해 RTK-GPS 측량을 병행 실시하였다. RTK-GPS 측량을 실시하기 전 낙동강권역내의 국립지리정보원에서 관리하고 있는 통합기준점을 대상으로 삼각망 구축을 실시하였다. RTK-GPS 측량의 결과를 토대로 직접수준측량과의 비교 검토를 실시하였으며, 두 측량성과간의 차이가 0.2m 이상을 경우에는 재 측량을 실시하여 발생될 수 있는 오류를 최소화 하였다. 또한 수준측량과 RTK-GPS 측량으로 확정된 영점표고검정수준점의 표고값을 이용하여 수위표 영점표고의 적정성을 검토하고자 하는 해발수위 비교를 실시하였다. 비교방법은 비교적 수면경사가 크게 나타나지 않는 지점을 선택하여 적정성을 검토하였으며, 기존 영점표고검정수준점보다 개선되는 효과를 얻을 수 있었다.

• Journal of Korea Multimedia Society
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• v.15 no.7
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• pp.859-869
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• 2012

The Multi-view Video Coding (MVC) which is exploiting disparities between views has been developed to improve the coding efficiency of multi-view video. But MVC has a problem of having high computing complexities because of disparity estimation. This paper propose a fast mode decision for non-anchor picture to reduce the computational time of MVC. The proposed method uses two phases. Anchor pictures in hierarchical B picture structure have a higher correlation with prediction mode selection of non-anchor pictures, so in the first phase, prediction mode of non-anchor pictures is selected by exploiting the macro-block regions in anchor picture. In the second phase, we select a reference direction of inter prediction mode exploiting a higher correlation among reference directions of inter prediction modes of 7 block sizes. Experimental results show that the proposed method could save average about 44% in the encoding time with negligible coding efficiency losses.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.5
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• pp.437-449
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• 2007

This paper deals with issues of GPS network adjustment for the purpose of determining the $3^{rd}$ order national geodetic control points based on the Korean Geodetic Datum which has newly adopted in the country since early 2003. After examining and arranging all the observations, GPS baseline analyses were performed to estimate baseline vectors between two control points. All the observations were divided into 17 block networks in order to accelerate the adjustment efficiency. After applying a minimally constrained adjustment technique to each of the block networks for the sake of detecting outliers and examining network precision, over constrained adjustments by fixing all of the $2^{nd}$ order control points within the block network were carried out to derive final coordinate sets. The final solutions indicated that the accuracy of the adjusted coordinates was better than 1cm and 2cm in the horizontal and vertical component, respectively.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.412-412
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• 2017

강우빈도해석을 위해서는 확률분포선정이 우선적으로 이루어져야 한다. 우리나라에서는 사용상의 편리상, 기존 해석결과와의 연속성 등을 이유로 Gumbel 확률분포가 가장 일반적으로 활용되고 있다. 그러나, 분포형 선정에 따른 확률강수량의 차이가 크게 발생한다는 점에서 단순히 해석상의 편리성을 기준으로 분포형 선정이 이루어지는 것은 바람직하지 않다. 특히, 우리나라에서 강우빈도해석 시 분포형 선정은 형식적인 수준에 그치고 있으며, 주로 KS검정, 검정 등 적합도 검정을 통해 고려된 분포형의 통계적 유의성만을 평가하고 있다. 그러나, 최적 분포형 선정이라는 관점에서 이러한 유의성 검정보다는 정량적인 지표를 기준으로 확률분포형 선정이 이루어지는 것이 적합할 것으로 판단된다. 즉, 자료의 설명력이 가장 우수한 분포를 정량적 지표를 기준으로 추정하는 것이 수문통계학적으로 적합성을 갖는다. 이러한 점에서 본 연구에서는 우도함수, BIC 및 AIC를 기준으로 우리나라 주요 강수지점에서 대해서 최적 분포형을 선정하고, 기존 Gumbel 분포를 기준으로 산정된 확률강수량과의 양적차이를 평가해보고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.2A
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• pp.137-145
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• 2002

In the method of 3D modeling, stereo matching method which obtains three dimensional depth information from the two images is taken from the different view points. In general, it is very essential work for the 3D modeling from 2D stereo images to estimate the exact disparity through fading the conjugate pair of pixel from the left and right image. In this paper to solve the problems of the stereo image disparity estimation, we introduce a novel approach method to improve the exactness and efficiency of the disparity. In the first place, we perform a wavelet transformation of the stereo images and set the reference points in the image by the feature-based matching method. This reference points have very high probability over 95 %. In the base of these reference points we can decide the size of the variable block searching windows for estimating dense disparity of area based method and perform the ordering constraint to prevent mismatching. By doing this, we could estimate the disparity in a short time and solve the occlusion caused by applying the fried-sized windows and probable error caused by repeating patterns.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.26 no.4
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• pp.423-431
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• 2008

The control surveying which aims at identifying the coordinate system of satellite images with that of ground is a repeatedly performed essential process to produce digital ortho - photos and it acts as the main factor to increase the production cost of the photos by duplicated budgets and redundant works when executing the projects for acquiring basic geographical information from high density satellite images. During the experimentation, an application system was established for producing a stereo image chip by the analysis of DPPDB file structure, the stereo image chip was produced with SPOT and IKONOS images, the analysis of 3D modeling accuracy was performed to secure the required accuracy and to present the optimal number and deployment of the control points, and a 3D modeling was performed for new SPOT images and lastly, 3D ground coordinates were extracted by the observation of the same points through the overlapping with the new images. As the results of the research, it is proved that the stereo image chip can be used as the ground controls through the accuracy analysis between the coordinates of the images and the ground, close results were obtained between the coordinates by the ground survey and those by the 3D modeling using new images and the observation of the same points, positional changes were not found during observing the same points, and the research presented the methodology for improving the process of the control survey by showing the availability of the image controls on the stereo image chip instead of the ground controls.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.8
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• pp.1247-1255
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• 2013

In this paper, We proposes multipurpose function electronic measurement reference station prototype system based on LED and Gyro Sensor. This system have developed to possible with real time data collection and landscape illumination and surrounding diastrophism monitoring for that analyze problems of existing planted reference station. Hardware for the proposed system consists of a gyro sensor module to detect diastrophism, GPS module to process location information, environment sensor module to process surrounding environmental data and CDMA wireless data communication to send the collected data to server. In addition, this paper intends to enhance system management and future usability in a way that applies LED, QR-code, RFID and Solar cell module to outer side of electronic measurement reference station to improve usability of H/W for electronic measurement reference station. Lastly, this paper conducted current amount evaluation to supply stabilized electricity with its various functions in the proposed multipurpose function electronic measurement reference station and it's proved that this system can be stably operated with its electricity loss factor of 2.29% loss factor. And this paper conducted a qualitative comparison with existing electronic measurement reference station system in order to evaluate superiority of the proposed electronic measurement reference station.

• Annual Conference of KIPS
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• 2015.04a
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• pp.859-861
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• 2015

생산 기술이 발전함에 따라 제품의 생산량이 증가하고 컴퓨터 비전을 통한 제품의 양/불 판단 기술의 필요성이 증가하고 있다. 제품의 양/불 판단은 그 정확도가 중요하며, 동시에 빠른 검사를 위한 신속성이 요구된다. 기존 연구들에서 다양한 금속성 제품에 대한 양/불 판단과 각인된 글자에 대한 양/불 판단을 수행하는 연구가 지속되어 왔으나 자동차 에어백 부품 중 하나인 Upper Housing의 양/불을 판단하는 알고리즘은 부재하다. 본 논문에서는 Upper Housing에 대해 각인 문자의 양/불을 판정하는 알고리즘을 제안한다. 먼저 영상에서 기준점이 되는 원을 찾는 것부터 시작하여, 기준점을 기반으로 특정 각도로 회전시켜 미리 수집한 글자 이미지와의 템플릿 매칭을 통해 글자가 제대로 각인 되었는지를 판단한다. 실험에서는 에어백 부품에 대한 검사 장치에서 촬영한 동영상에 대하여 제안한 알고리즘을 적용하였고, 그 결과 높은 정확도로 글자를 검출할 수 있음을 확인하였다.

• Spatial Information Research
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• v.17 no.2
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• pp.191-200
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• 2009

Aerial digital camera was used in outside since 2000 because of technical development & improvement of it. In korea, line type or frame type digital camera introduced since 2006 was used in manufacture and Correction of National base map appling the number and distribution of control point of analogue aerial triangulation from 2008. The main objective of the study is to compare and analyze the effects of the number and distribution of control points in accuracy of results, when we execute aerial triangulation with images from ADS40, line type sensored aerial digital camera available in korea. The result of RMSE can be concluded that accuracy of all the case are meet the aerial photograph surveying work regulation of NGI as to horizontal of control point ${\pm}0.068m$, ${\pm}0.073m$, ${\pm}0.071m$, height ${\pm}0.041m$, ${\pm}0.055m$, ${\pm}0.055m$, ${\pm}0.041m$, as to horizontal of check point ${\pm}0.167m$, ${\pm}0.113m$, ${\pm}0.110m$, height ${\pm}0.128m$, ${\pm}0.086m$, ${\pm}0.081m$. We have confirmed that it is possible to make out large scale digital topographic map.