• Korean Journal of Remote Sensing
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• v.35 no.5_2
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• pp.851-859
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• 2019

The COMS satellites take image of the Korean Peninsula every 15 minutes, but due to the limitations of the observational channels, they tend to underestimate when estimating rainfall. In this study, we developed satellite-based rainfall estimation technology using COMS and GPM that can be used in the heavy rain on the Korean Peninsula. The time resolution and spatial resolution of COMS satellites and GPM satellites were matched to improve accuracy using GPM IMERG data. As a result, it showed that the number of correlations with the ASOS observations was more than 0.7, enabling the estimation of rainfalls that are more accurate than the estimates of rainfall by COMS satellites. It is believed that the application of the subsequent satellite(GK-2A) will provide more accurate rainfall estimation information in the future. Therefore, we expect greater utilization in disaster management for the ungauged areas.

• Convergence Security Journal
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• v.15 no.7
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• pp.119-124
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• 2015

The purpose of this study was to examine the current status and future prospects through the Classification of sports and ICT convergence technology for the health. Sports and ICT convergence technology could be classified into three types-sports and virtual reality, wearable devices, application and platforms. First, the application of virt ual reality technology gives a user the feeling of reality, fun, and flow through the sensing technology. And this was extended to 'Gamification' concept, gamification of the Nike Plus has become a catalyst in the spread of wea rable devices market. Second, the fastest growing sector in the wearable device area is the health and sports. Chin ese and start-up companies as well as global ICT companies is competing for expanding the pool by releasing the fitness-related wearable devices. Third, the building of platform that can utilize the health and exercise-related dat a collected through the application is expanding.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.66-71
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• 2003

This study investigates the spatial patterns of distributed population in terms of population density, age structure, sex structure and family structure in Chou (smallest political city boundaries) of seven cities of Kitakawachi region. This displays the population dynamics of those cities from 1955 to 1995. It demonstrates how the populations of the cities are distributed with topography and with respect to the train stations. The demographic characteristics of the cities are visualized utilizing Arc View GIS capabilities with new visualizing technique in 3D environment based on data from Pasco Digital Map 2000.

• Proceedings of the KSRS Conference
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• 1999.11a
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• pp.425-428
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• 1999

The radar interferogram represents phase differences between the two synthetic aperture radar observations acquired in slightly different angle. The success of the radar interferometric application largely depends on the quality of the interferogram generated from two or more synthetic aperture radar data sets. We propose here to apply the wavenumber correlation analysis to the in-phase and quadrature phase of the radar interferogram. The wavenumber correlation analysis is to resolve the highly correlated components from the low correlation components by estimating correlation coefficients for each wavenumber component. Through this approach, one can easily distinguish the signal components from the noise components in the wavenumber domain. Therefore, the wavenumber correlation analysis of the radar interferogram can be utilized to design post filter and to estimate the quality of interferogram. We have tested the wavenumber correlation analysis using a Radarsat SAR data pair to demonstrated the effectiveness of

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.519-521
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• 2005

In recent years, LiDAR(Light Detection and Ranging) data has been widely used to prepare digital elevation models(DEMs) with the high spatial resolution of centi-meters. This paper investigated possible applications of LiDAR-derived DEMs in surface hydrology modeling, such as characterizing flow direction, identifying sub-basins in a watershed, and calculating variables like upstream contribution area. The results were compared to the results of the DEMs from conventional topographic maps.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.381-384
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• 2005

We have applied the TOMS aerosols retrieval algorithm to GLI measurements. TOMS has utilized the aerosol index, which is a measure of the change in spectral contrast due to the wavelength-dependent effects of aerosols. We have retrieved the GLI aerosol index, which is made by the pair of 380/400nm, 380/412nm, 380/460nm, and 412/460nm. We have found that the biomass burning aerosols represent the absorbing aerosols. In addition, the pair of 380/460nm has shown the best signal for detecting aerosols in Principal Component Analysis(PCA) and comparison of aerosol optical thickness from AERONET data. The theoretical aerosol index is also shown the best signal in the pair of 380/460nm.

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.4
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• pp.9-16
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• 2008

Ubiquitous technology is proposed which is used wireless sensor network for deflection management at casting and after casting of FCM bridge. Proposed method are analyzed which are sensor experiment and existing FCM bridge using ubiquitous sensor network. Wireless sensor network enables low-cost sensing of environment. As a results, the field application shows that USN is useful method for structural health monitoring system which long distance away.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.10-13
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• 2004

Hyperspectral data has a great advantage to classify various surface materials that are spectrally similar. In this study, we attempted to classify man-made materials in urban area using Hyperion data. Hyperion imagery of Seoul was initially processed to minimize radiometric distortions caused by sensor and atmosphere. Using color aerial photographs. we defined seven man-made surfaces (concrete, asphalt road. railroad, buildings, roof, soil, shadow) for the classification in Seoul. The hyperspectral data showed the potential to identify those manmade materials that were difficult to be classified by multispectral data. However. the classification of road and buildings was not quite satisfactory due to the relatively low spatial resolution of Hyperion image. Further, the low radiometric quality of Hyperion sensor was another limitation for the application in urban area.

• Proceedings of the KSRS Conference
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• 2006.03a
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• pp.299-302
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• 2006

SAR 영상의 Speckle noise는 해석을 방해하는 요인이 되고 분류할 때 분류정확도를 떨어뜨리는 역할을 하기 때문에 이를 감소시키기 위한 전처리 과정이 필요하다. 이 연구에서는 SAR 영상의 Speckle noise를 줄이기 위해서 영상의 특성을 분석하고 영상에 맞는 wavelet 변환을 이용한 필터링 기법과 Variogram에 기반한 필터링 기법을 제시하고 SAR 영상에 대한 적용 실험을 수행하였으며 그 결과를 분석하였다. 실험 결과 variogram 기반 필터링은 기존의 adaptive filter와 유사한 결과를 보였고 wavelet 기반 필터링은 기존의 필터링보다 좀 더 나은 결과를 보였다.

• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.260-263
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• 2001

This paper is to develop the sensing system for opening-force measurement such as O-Ring muscular meridian. We designed to overcome the functional limit that the conventional force-sensor can measure just the closing-force. Therefore, the new sensor can meet a variety of application as well as O-Ring test. The structure of the new sensor is an actuator-type system using an electromagnet. That is made up of mechanical system, electromagnet, current transformer and computer interface circuit. Driving software and user interface program of the new sensor system also is explained in this paper.