• 대한공간정보학회지
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• 제19권4호
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• pp.127-138
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• 2011

본 연구에서는 지적기준점과 도시기준점을 연계 활용의 가능성을 제시하고자 창원시를 대상으로 세계측지계 성과로 고시된 창원시 도시기준점(32점)의 GPS 관측데이터를 이용하여 도시기준점에 대한 지적좌표 성과를 산출 분석하여 보았다. 연구결과 3가지 서로 다른 계산 S/W를 이용해 지적좌표를 산출하고 이를 기존 도시기준점 고시 성과와 비교한 결과 현행 법률에서 규정하고 있는 오차의 허용범위 이내로 분석되어 지적측량에 활용 가능성이 있는 것으로 나타났다. 다만 실무에서 안정적인 활용 위해 현행 도시기준점 고시 성과를 직접 지적측량에 이용하기 보다는 새로이 지적성과를 산출해서 활용하는 방안을 제안하였다. 또한 지역 삼각점에 대한 사전 정밀한 성과점검이 필요함을 제시하였다. 끝으로 계산 S/W는 삼변망조정계산 S/W가 적합한 것으로 나타났다.

• Journal of the Korean Data and Information Science Society
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• 제26권1호
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• pp.261-269
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• 2015

Nowadays the application of change point analysis has been indispensable in a wide range of areas such as quality control, finance, environmetrics, medicine, geographics, and engineering. Identification of times where process changes would help minimize the consequences that might happen afterwards. The main objective of this paper is to compare the change-point detection capabilities of Bayesian estimate and maximum likelihood estimate. We applied Bayesian and maximum likelihood techniques to formulate change points having a step change and multiple number of change points in a Poisson rate. After a signal from c-chart and Poisson cumulative sum control charts have been detected, Monte Carlo simulation has been applied to investigate the performance of Bayesian and maximum likelihood estimation. Change point detection capacities of Bayesian and maximum likelihood estimation techniques have been investigated through simulation. It has been found that the Bayesian estimates outperforms standard control charts well specially when there exists a small to medium size of step change. Moreover, it performs convincingly well in comparison with the maximum like-lihood estimator and remains good choice specially in confidence interval statistical inference.

• 전기학회논문지
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• 제57권10호
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• pp.1726-1730
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• 2008

In this paper, the application schemes for coordinated control system of multiple FACTS were presented to enhance the voltage stability around the metropolitan areas. In order to coordinated control of FACTS devices, f-V analysis method which is one of the indices for voltage stability was performed with real time network data which is transferred from SCADA/EMS system. If the system is unstable after contingencies, the new operation set-point of FACTS would be determined using bus sensitivity from tangent vector at voltage instability point. Otherwise, we would determine the new operation set-point of FACTS for considering economical operation, like as active power loss minimization using Optimal Power Flow algorithm. In simulation, the SCADA/EMS 2007's data are used for studying the coordinated control algorithm of multiple FACTS devices that is installed or will be installed in KOREA power system

• Membrane and Water Treatment
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• 제11권5호
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• pp.345-351
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• 2020

Eutrophication of surface waters is commonly caused by excessive inputs of nutrients such as nitrogen and phosphorus. Nakdong River basin was chosen as the study area to investigate the effect of point and non-point source pollution of nitrogen on eutrophication in water body. Non-point source inputs of nitrogen accounted for approximately 84% in the total nitrogen input of the upper Nakdong river watershed, which mainly consists of agricultural land and forests. However, point source inputs of nitrogen accounted for 58~85% in the total nitrogen input of the middle and lower watersheds, including urban area. Therefore, for watershed near urban area, control of point source inputs of nitrogen may be an optimal method to control eutrophication. In this respect, the enforcing reduction of nitrogen in the final effluent of wastewater treatment facilities is needed. On the other hand, to enact more stringent nitrogen regulations, the LOT (limit of technology) and environmental impact should be considered. In this study nitrogen data were analyzed to propose new nitrogen regulations.

• 정보관리학회지
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• 제27권3호
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• pp.125-146
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• 2010

본 연구에서는 셀프 아카이빙(self-archiving)을 기본으로 메타데이터가 구축되는 기관 리포지터리의 인명 검색 문제점을 해결하고자, 인명 접근점제어 데이터를 구축하였다. 이를 위해 기존 도서관의 전거데이터를 활용하면서도 전거형을 인정하지 않고, 정보원에 기재된 형식을 모두 접근점으로 사용하는 그룹화 방법을 사용하고, 동명이인 처리를 위해 저작자의 주제분야와 저작정보를 확장해서 사용하는 새로운 방법을 토대로 인명 접근점제어 데이터를 구축하고 시스템에 적용하여 검색의 기능이 향상되었다. 향후 기관 리포지터리 외에 도서관이 총괄하는 모든 메타데이터의 검색 기능 향상을 위해서도 활용할 수 있을 것이다.

• 한국생산제조학회지
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• 제20권4호
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• pp.386-394
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• 2011

This paper is concerned with the application of the vision control scheme for robot's point placement task in discontinuous trajectory caused by obstacle. The proposed vision control scheme consists of four models, which are the robot's kinematic model, vision system model, 6-parameters estimation model, and robot's joint angles estimation model. For this study, the discontinuous trajectory by obstacle is divided into two obstacle regions. Each obstacle region consists of 3 cases, according to the variation of number of cameras that can not acquire the vision data. Then, the effects of number of cameras on the proposed robot's vision control scheme are investigated in each obstacle region. Finally, the practicality of the proposed robot's vision control scheme is demonstrated experimentally by performing the robot's point placement task in discontinuous trajectory by obstacle.

• 한국측량학회지
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• 제40권1호
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• pp.1-14
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• 2022

굴착 현장에서 신속·정확·안전한 측량을 위해 본 연구에서는 드론을 이용한 지하 시설물 측량의 적용 가능성 및 3D 시각화의 기대효과를 다음과 같이 도출하였다. Phantom4 Pro 20MP의 드론으로 30m의 비행 고도, 중복도 85%의 비행계획으로 0.85mm의 GSD (Ground Sampling Distance)값을 확보하였고, GCP (Groud Control Point)4점과 검사점 2점을 계산하여 기준점에 대하여 7.3mm, 검사점은 11mm의 성과를 취득할 수 있었다. 저가의 드론으로 측량할 경우 GCP의 중요성이 확인되었으며, 지상 기준점이 없는 경우, X값의 오차 범위는 -81.2cm에서 +90.0cm, Y값의 오차 범위는 +6.8cm에서 155.9 cm 값을 도출하였다. Pix4D 프로그램을 이용하여 포인트 클라우드 데이터를 분류하였다. 지하 시설물 데이터와 도로 포장면의 데이터를 분류하고, 중첩과정을 통해 실제 모형의 도로와 지하 시설물의 데이터를 3D 시각화하였다. 중첩된 포인트 클라우드 데이터는 Open Source 프로그램인 CloudCompare를 통해 사용자가 원하는 장소의 위치와 심도 정보를 확인할 수 있게 되었다. 본 연구결과로 지하 시설물 측량의 새로운 패러다임으로 자리매김하게 될 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.43-45
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• 2004

This paper represents the improvement of floating point operation for AC servo motor controller based on fixed point operation DSP. TMS320F2812 has fixed point operation processing structure. The controller parameters are modified to the digitized data by scaling the original parameters. TMS320F 2812 is a 32-bit processor, and it could have enough accuracy to get the digitized data this procedure is implemented and the experiments controling a AC servo system.

• International Journal of Control, Automation, and Systems
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• 제2권2호
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• pp.201-206
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• 2004

Counters for the various kinds of banknotes require high-speed distinctive point extraction and recognition. In this paper we propose a new point extraction and recognition algorithm for Euro banknotes. For distinctive point extraction we use a coordinate data extraction method from specific parts of a banknote representing the same color. To recognize banknotes, we trained 5 neural networks. One is used for inserting direction and the others are used for face value. The algorithm is designed to minimize recognition time by using a minimal amount of recognition data. The simulated results show a high recognition rate and a low training period. The proposed method can be applied to high speed banknote counting machines.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.780-783
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• 2004

Recently Intake noise has been extensively studied to reduce the engine noise. In order to diminish intake noise several resonators were added to the intake system. However this can cause a reduction of engine output power and an increase of fuel consumption. In this study, active noise control simulation of the Filtered-x LMS algorithm is applied real instrumentation intake noise data under rapid acceleration because intake noise is more excessively increased under the such a harsh condition. But the FXLMS algorithm has poor control performance when the system is disturbed. Thus modified FXLMS algorithm using L-point running average filter is developed to improve the control performance under the rapid acceleration and disturbance. The noise reduction quantity of modified Filtered-x LMS algorithm is more than original one in two cases. In the case of control for real instrumentation intake noise data, maximum residual noise of modified FXLMS algorithm is 2.5 times less than applied the FXLMS and also in the case of disturbed, the modified FXLMS algorithm shows excellent control performance but FXLMS algorithm cat not control.