• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.37-40
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• 2008

The purpose of this paper is to extract DEMs from Spot-3 strips using orbit modeling technique. Spot-3 stereo strip images along 420km in distance were used for experiments. The orbit modeling technique has been suggested to establish accurate geometric models for a whole strip taken on the same orbit using only a small number of GCPs on the top area of the strip. This method enables extraction of orientation parameters of the scene along the strip that is needed to generate DEMs. Consequently, we were able to extract DEMs over the areas without accurate GCPs obtained by GPS surveying per each scene. Assessment of accuracy was carried out using USGS DTED. DEMs generated from the orbit modelling technique suggested showed satisfactory performance when quantitative analysis of accuracy assessment was carried out.

• 기본간호학회지
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• 제19권4호
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• pp.444-452
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• 2012

Purpose: To explore the usefulness of previous fall history as a triage variable for inpatients. Methods: Medical records of 21,382 patients, admitted to medical units of one tertiary hospital, were analyzed retrospectively. Inpatient falls were identified from the hospital's self-report system. Non-falls in 1,125 patients were selected by a stratified matching sampling with 125 patients with falls (0.59%). A comparative and predictive accuracy analysis was conducted to describe differences between the two groups with and without a history of falls. Logistic regression was used to measure the effect size of the fall history. Results: The fall history group showed higher prevalence by 9 fold than the non-fall history group. The relationships between falls and relevant variables which were significant in the non-fall history group, were not significant for the fall history group. Falls in the fall history group were 25 times more likely than in the non-fall group. Predictive accuracy of the risk assessment tool showed almost zero specificity in the fall history group. Conclusion: The presence of fall history, the fall prevalence, variables relevant to falls, and the accuracy of the risk tool were different, which support the usefulness of the fall history as a triage variable.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.1328-1334
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• 2015

A new system for evaluating the voltage management errors of distribution equipment is presented in this paper. The main concept of the new system is to use real distribution live-line voltage to evaluate and correct the voltage measurement data from distribution equipment. This new approach is suitable for a new Distribution Management System (DMS) which has been developed for a distribution power system due to the connection of distributed generation growth. The data from distribution equipment that is installed at distribution lines must be accurate for the performance of the DMS. The proposed system is expected to provide a solution for voltage measurement accuracy assessment for the reliable and efficient operation of the DMS. An experimental study on actual distribution equipment verifies that this voltage measurement accuracy assessment system can assess and calibrate the voltage measurement data from distribution equipment installed at the distribution line.

• 한국측량학회지
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• 제20권2호
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• pp.105-110
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• 2002

본 연구에서는 항공 레이저 매핑 시스템(Airborne Laser Mapping System, ALMS)에 의해 생성된 DTM의 정확도 분석을 위해 500 m 간격으로 측점지역을 선정하고 GPS 측량을 통한 다양한 검증방법으로 DTM의 정확도를 분석하였다. ALMS에 의한 DTM의 각 점 사이의 고도값 추정을 위해 TIN을 제작하였고, GPS를 이용한 측점들의 커버리지를 제작하여 TIN과 중첩하는 방법으로 정확도를 분석하였다. ALMS에 의한 DTM의 고도값 정확도는 기존의 수치표고모델 제작방법보다 높은 것으로 확인되어 1/5000이상의 수치표고 제작에 ALMS를 적용할 수 있는 것으로 나타났다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.286-288
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• 2003

In this paper, we present our implementation of the direct camera model (image to ground) for SPOT5 and use it to assess the geometric accuracy of SPOT5 imagery. Our assessment confirms the location accuracy of SPOT5 imagery (without use of GCPs) is less than 50m. We further introduce a few attitude parameters to refine the camera model with GCPs. The model is applied to two SPOT5 supermode images, one near vertical, incidence angle of 3 degrees, and one far oblique, incidence angle of 27 degrees. The results show that accuracy (rms of check points) of about one pixel (2.5m) can be achieved with about 4 GCPs by using only 3 parameters to correct the yaw, pitch and roll of the satellite.

• 한국생활과학회지
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• 제9권4호
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• pp.447-457
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• 2000

The purpose of this study was to examine the accuracy of consumer's self-assessment on actual diets and to analyze its accuracy by consumer's health status. The results were as follows: In general, many consumers misunderstood or assessed inaccurately their actual diets. In particular, the Extreme Optimists and the Optimists were the consumers whose diets were poor, but who assessed wrongly their actual diet quality. In relation with their health status, these two groups showed that the better the consumers consider their health, the more the Extreme Optimists and the Optimists are.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.395-396
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• 2007

Bone age assessment has been widely used to measure the ossification in pediatric radiology. For the assessment, first bone age of each epiphyseal plate is estimated using DCT/LDA, then the bone age of a patient is calculated by using the median of 9 estimations. For some patients, however, due to various reasons such as X-ray image quality or the pose of fingers, it is common to miss couple of plates in automated systems. In this paper, we investigate the relationship between the number of detected plates and the accuracy of bone age assessment. In the experimental results, we confirmed the similarity between bone age assessed using more than 7 epiphyseal plates and that assessed using 9 epiphyseal plates.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 춘계학술발표회논문집
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• pp.259-262
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• 2004

There is the case to make the image map by using color aerial photo, DEM gives the accuracy of the Ortho image. Therefore We evaluate the accuracy by digital photogrammetric system after generating the DEM of Color Aerial Image.

• 환경영향평가
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• 제7권2호
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• pp.27-35
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• 1998

In Korea, the initial installation of GIS requires lots of cost, time, and human efforts. If the accuracy of GIS data does not meet the certain standard for use, the system may not work as expected. So, it needs to be investigated for the accuracy of raw data. However, there is little study for the accuracy of raw data in Korea. Therefore, the purpose of this study is to review the data accuracy of raw data - geologic map, 1:5,000 and 1:25,000 scale topographic map, forest stand map, degree of green naturality(DGN) map, and detailed survey data of DGN map-, which are to be used in Environmental Information System(EIS) in Korea. After this study, some errors in data were surveyed and following conclusions were derived. (1) There is no map data, e. g, wildlife habitat map. (2) Some data are misinterpreted depending on the location in the geologic map. (3) Some data are not updated properly after change of topography in the topographic map or the elevation and location is different depending on the scale.. (4) Some data are not edited properly in the forest stand map, e. g. two attributes in one polygon. (5) DGN classification system does not reflect the characteristic of Korean vegetation community. So, it needs to be refined and restructured.

• 대한공간정보학회지
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• 제14권4호통권38호
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• pp.19-26
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• 2006

본 연구에서는 LiDAR 자료로부터의 지면정보 추출기법들에 대한 정확도를 평가하였다. 특히, 포인트 형태의 벡터자료인 LiDAR 원시자료를 직접 활용하는 기법과 정규격자형식의 DSM 형식으로 변형하여 활용하는 기법의 정확도를 비교하였다. 정규격자형식의 자료를 이용하는 방법으로는 경계추출 및 필터링 기법을 이용하는 방법, 평균필터링에 의하여 생성된 추세면을 이용하는 방법을 적용하였으며, 벡터구조의 원시LiDAR 자료를 직접 활용하는 기법으로써 Local Maxima 및 엔트로피를 이용하는 방법을 적용하였다. 또한, 수작업을 통하여 제작된 DEM 및 수치지도의 축척별 오차허용범위를 이용하여 정확도 평가를 수행하였으며, 경계검출 및 필터링, 추세면, Local Maxima, 엔트로피를 이용한 각 기법의 DEM의 평균 오차는 0.27m, 2.43m, 0.13m, 0.10m로써 엔트로피를 이용한 방법이 가장 높은 정확도를 나타내었다. 또한, 벡터형식의 LiDAR원시자료를 직접 이용하는 방법이 격자형식으로 변환하는 방법에 비하여 상대적으로 높은 정확도를 나타내었다.