• 제목/요약/키워드: EOC

검색결과 197건 처리시간 0.028초

Automatic Extraction of Road Network using GDPA (Gradient Direction Profile Algorithm) for Transportation Geographic Analysis

  • Lee, Ki-won;Yu, Young-Chul
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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    • pp.775-779
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    • 2002
  • Currently, high-resolution satellite imagery such as KOMPSAT and IKONOS has been tentatively utilized to various types of urban engineering problems such as transportation planning, site planning, and utility management. This approach aims at software development and followed applications of remotely sensed imagery to transportation geographic analysis. At first, GDPA (Gradient Direction Profile Algorithm) and main modules in it are overviewed, and newly implemented results under MS visual programming environment are presented with main user interface, input imagery processing, and internal processing steps. Using this software, road network are automatically generated. Furthermore, this road network is used to transportation geographic analysis such as gamma index and road pattern estimation. While, this result, being produced to do-facto format of ESRI-shapefile, is used to several types of road layers to urban/transportation planning problems. In this study, road network using KOMPSAT EOC imagery and IKONOS imagery are directly compared to multiple road layers with NGI digital map with geo-coordinates, as ground truth; furthermore, accuracy evaluation is also carried out through method of computation of commission and omission error at some target area. Conclusively, the results processed in this study is thought to be one of useful cases for further researches and local government application regarding transportation geographic analysis using remotely sensed data sets.

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Texture Image Fusion on Wavelet Scheme with Space Borne High Resolution Imagery: An Experimental Study

  • Yoo, Hee-Young;Lee , Ki-Won
    • 대한원격탐사학회지
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    • 제21권3호
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    • pp.243-252
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    • 2005
  • Wavelet transform and its inverse processing provide the effective framework for data fusion. The purpose of this study is to investigate applicability of wavelet transform using texture images for the urban remote sensing application. We tried several experiments regarding image fusion by wavelet transform and texture imaging using high resolution images such as IKONOS and KOMPSAT EOC. As for texture images, we used homogeneity and ASM (Angular Second Moment) images according that these two types of texture images reveal detailed information of complex features of urban environment well. To find out the useful combination scheme for further applications, we performed DWT(Discrete Wavelet Transform) and IDWT(Inverse Discrete Wavelet Transform) using texture images and original images, with adding edge information on the fused images to display texture-wavelet information within edge boundaries. The edge images were obtained by the LoG (Laplacian of Gaussian) processing of original image. As the qualitative result by the visual interpretation of these experiments, the resultant image by each fusion scheme will be utilized to extract unique details of surface characterization on urban features around edge boundaries.

위성해색자료의 대기보정 알고리즘 : OCTS-type과 CZCS-type 알고리즘의 성능비교 (Atmospheric correction algorithms for satellite ocean color data: performance comparison of "CTS-type" and "CZCS-type" algorithms)

  • Hajime Fukushima;Yasushi Mitomi;Takashi Otake;Mitsuhiro Toratani
    • 대한원격탐사학회지
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    • 제14권3호
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    • pp.262-276
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    • 1998
  • The paper first describes the atmospheric correction algorithm for the Ocean Color and Temperature Scanner (OCTS) visible band data used at Earth Observation Center (EOC) of National Space Development Agenrr of japan (NASDA). It uses 10 candidate aerosol models including "Asian dust model" introduced in consideration of the unique feature of aerosols over the east Asian waters. Based on the observations at 670 and 865 nm bands where the reflectance of the water body can be discarded, the algorithm selects a pair of aerosol models that accounts best for the observed spectral reflectances to synthesize the aerosol reflectance in other bands. The paper also evaluates the performance of the algorithm by comparing the satellite estimates of water-leaving radiance and chlorophyll-a concentration with selected buoy- and ship-measured data. In comparison with the old CZCS-type atmospheric correction algorithm where the aerosol reflectance is assumed to be spectrally independent, the OCTS algorithm records factor 2-3 less error in estimating the normalized water-leaving radiances. In terms of chlorophyll-a concentration estimation, however, the accuracy stays very similar compared to that of the CZCS-type algorithm. This is considered to be due to the nature of in-water algorithm which relies on spectral ratio of water-leaving radiances.

Evidential Fusion of Multsensor Multichannel Imagery

  • Lee Sang-Hoon
    • 대한원격탐사학회지
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    • 제22권1호
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    • pp.75-85
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    • 2006
  • This paper has dealt with a data fusion for the problem of land-cover classification using multisensor imagery. Dempster-Shafer evidence theory has been employed to combine the information extracted from the multiple data of same site. The Dempster-Shafer's approach has two important advantages for remote sensing application: one is that it enables to consider a compound class which consists of several land-cover types and the other is that the incompleteness of each sensor data due to cloud-cover can be modeled for the fusion process. The image classification based on the Dempster-Shafer theory usually assumes that each sensor is represented by a single channel. The evidential approach to image classification, which utilizes a mass function obtained under the assumption of class-independent beta distribution, has been discussed for the multiple sets of mutichannel data acquired from different sensors. The proposed method has applied to the KOMPSAT-1 EOC panchromatic imagery and LANDSAT ETM+ data, which were acquired over Yongin/Nuengpyung area of Korean peninsula. The experiment has shown that it is greatly effective on the applications in which it is hard to find homogeneous regions represented by a single land-cover type in training process.

아날로그와 디지탈 보호계통의 정상 상태 여유도 비교 (A Steady-State Margin Comparison between Analog and Digital Protection Systems)

  • Auh, Geun-Sun;Hwang, Dae-Hyun;Kim, Si-Hwan
    • Nuclear Engineering and Technology
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    • 제22권1호
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    • pp.45-57
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    • 1990
  • 아날로그와 디지탈 보호계통의 정상상태 여유도를 비교하였다. 비교된 예는 웨스팅하우스사의 OP Delta T 및 OT Delta T 계통과 CE사의 CPCS 계통이다. 안전해석 방법의 차이에 의한 여유도 영향을 제거하기 위해 Dynamic Offset은 고려하지 않았다. 핵연료봉 중심선의 용융을 방지하는데 있어서 디지탈 보호계통이 아날로그 보호계통보다 약 30% 출력 정도의 운전 여유도를 더 가졌다. DNB를 방지하는데 있어서는 주기말에서는 양 보호계통이 비슷한 여유를 가졌으나 주기초에서는 디지탈 보호계통이 약 10%의 더 많은 운전여유를 가지는 것으로 판단된다.

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Ka 대역 안테나 서브시스템 포인팅 에러 분석 (Ka-band Antenna Subsystem Pointing Variation Analysis)

  • 이용덕;최장섭;박재우;이성필
    • 한국위성정보통신학회논문지
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    • 제1권2호
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    • pp.32-37
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    • 2006
  • 한국전자통신연구원은 2008년 말에 발사될 예정인 통신해양위성에 탑재될 Ka대역 안테나서브시스템을 개발하고 있다. Ka대역 통신용 안테나 서브시스템은 위성체의 동,서 판넬에 각각 하나씩 구성되어 있다. 이를 추진하기 위하여 한국전자통신연구원은 현제 대한항공(주)과 공동으로 통신위성 안테나 서브시스템을 설계하고 있다. 본 논문은 이득 변화 등과 같은 안테나 서브시스템 성능 규격을 검증하기 위하여 Ka 대역 반사판 포인팅 에러분석에 대하여 기술한다. 수행된 분석은 열변형에 의한 반사판 표면 변형 데이터 이며 이를 Ticra로 빔패턴의 변화를 확인하였다.

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Synergistic Effects of PectaSol-C Modified Citrus Pectin an Inhibitor of Galectin-3 and Paclitaxel on Apoptosis of Human SKOV-3 Ovarian Cancer Cells

  • Hossein, Ghamartaj;Keshavarz, Maryam;Ahmadi, Samira;Naderi, Nima
    • Asian Pacific Journal of Cancer Prevention
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    • 제14권12호
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    • pp.7561-7568
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    • 2013
  • Galectin-3 (Gal-3) is a carbohydrate-binding protein which is thought to be involved in cancer progression but its contribution to epithelial ovarian cancer (EOC) remains unclear. The present study sought to determine the role of Gal-3 in chemoresistance of the human SKOV-3 ovarian cancer cell line to paclitaxel (PTX) using recombinant human Gal-3 (rhGal-3) and PectaSol-C modified citrus pectin (Pect-MCP) as a specific Gal-3 competitive inhibitor. Our results showed 41% increased cell proliferation, 36% decreased caspase-3 activity and 33.6% increased substrate-dependent adhesion in the presence of rhGal-3 compared to the control case (p<0.001). Treatment of cells with a non-effective dose of PTX (100nM) and 0.1% Pect-MCP in combination revealed synergistic cytotoxic effects with 75% reduced cell viability and subsequent 3.9-fold increase in caspase-3 activity. Moreover, there was 39% decrease in substrate-dependent adhesion compared to control (p<0.001). These results suggest that inhibition of Gal-3 could be a useful therapeutic tool for combination therapy of ovarian cancer.

디지털 영상의 다차원 도시공간 시뮬레이션 적용기술연구 (A Study on the Application Technology of Multi-dimensional Urban geo-spatial Simulation using Digital Image)

  • 연상호;박희주;홍일화
    • 한국콘텐츠학회:학술대회논문집
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    • 한국콘텐츠학회 2003년도 춘계종합학술대회논문집
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    • pp.255-259
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    • 2003
  • 다양한 도시의 형태를 입체적으로 조망해 볼 수 있도록 하기 위하여 입체 지형조감도를 작성하였고, 이를 시공간에서 동영상으로 보여주기 위하여 3차원 시뮬레이션을 실시할 수 있도록 하였다. 입체 조감도의 제작은 투시기법을 이용한 이미지 제작 기법을 이용하였으며, 그 기본재료가 되는 영상들은 다음과 같이 준비하도록 하였다. 준비영상으로는 우리나라 아리랑 위성의 EOC 영상을 이용하도록 하였으며, 국립지리원에서 국가기본도로 제작한 1/5,000 수치지도의 등고선으로부터 추출하여 임의로 오차가 보정된 DEM 생성과 1/1,000 수지지도의 도로 레이어 벡터파일로 제작된 도로선을 분류하여 대상지의 3차원 영상 위에 중첩시켜 처리하는 것으로 하였다. 특히 이번 연구에 사용한 도심지역의 도로망 구성 데이터는 새주소 부여를 위해 제작된 1/1,000축척의 간선도로를 최대한 이용함으로서 새주소에서 사용하게 될 주소체계와의 연계성을 크게 염두에 두어 제작하도록 연구하였다.

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Oral Etoposide for Platinum-Resistant and Recurrent Epithelial Ovarian Cancer: a Study by the Anatolian Society of Medical Oncology

  • Kucukoner, Mehmet;Isikdogan, Abdurrahman;Yaman, Sebnem;Gumusay, Ozge;Unal, Olcun;Ulas, Arife;Elkiran, Emir T.;Kaplan, Muhammed A.;Ozdemir, Nuriye;Inal, Ali;Urakci, Zuhat;Buyukberber, Suleyman
    • Asian Pacific Journal of Cancer Prevention
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    • 제13권8호
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    • pp.3973-3976
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    • 2012
  • Background: The aim of this study was to evaluate the efficacy and toxicity of long-term, low-dose oral etoposide as an advanced treatment option in patients with platinum resistant epithelial ovarian cancer. Materials and Methods: For the purposes of this study, 51 patients with histologically-confirmed, recurrent or metastatic platinum-resistant epithelial ovarian cancer (EOC) treated at six different centers between January 2006 and January 2011 were retrospectively evaluated. Patients were treated with oral etoposide (50 mg/day for a cycle of 14 days, repeated every 21 days). Results: Among the 51 platinum-resistant patients, 17.6% demonstrated a partial response and 25.5% a stable response. The median progression-free survival (PFS) was 3.9 months (95% CI, 2.1-5.7), while the median overall survival was 16.4 months (11.8.20.9). No significant relationship was observed between the pre-treatment CA 125 levels, post-treatment CA-125 levels and the treatment response rates (p=0.21). Among the 51 patients who were evaluated in terms of toxicity, grade 1 or 4 hematologic toxicity was observed in 19 (37.3%); and grade 1-4 gastrointestinal toxicity occurred in 15 patients (29.4%). Conclusions: Chronic low-dose oral etoposide treatment is generally effective and well-tolerated in platinum-resistant ovarian cancer patients.

디지털 위성영상의 3차원 도시공간 시뮬레이션 적용기술연구 (A Study on the Application Technology of Three-dimensional Urban Geo-spatial Simulation using Digital Satellite Image)

  • 연상호
    • 한국콘텐츠학회논문지
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    • 제4권2호
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    • pp.7-12
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    • 2004
  • 다양한 도시의 형태를 입체적으로 조망해 볼 수 있도록 하기 위하여 입체 지형조감도를 작성하였고, 이를 시공간에서 동영상으로 보여주기 위하여 3차원 시뮬레이션을 실시할 수 있도록 하였다. 입체 조감도의 제작은 투시기법을 이용한 이미지 제작 기법을 이용하였으며, 그 기본 재료가 되는 영상들은 다음과 같이 준비하도록 하였다. 준비영상으로는 우리나라 아리랑 위성의 EOC(Electro optical Camera) 영상을 이용하였으며, 국토지리정보원에서 국가기본도로 제작한 1/5,000수치지도의 등고선으로부터 추출하여 임의로 오차가 보정된 DEM(Digital Elevation Model) 생성과 1/1,000 수치지도의 도로 레이어 벡터파일로 제작된 도로선을 분류하여 대상지의 3차원 영상 위에 중첩시켜 처리하는 것으로 하였다. 특히 이번 연구에 사용한 도심지역의 도로망 구성 데이터는 새주소 부여를 위해 제작된 1/1,000축척의 간선도로를 최대한 이용함으로서 새주소에서 사용하게 될 주소체계와의 연계성을 크게 염두에 두어 제작하도록 연구하였다.

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