http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
수치표고모델 및 PSInSAR 기법을 이용한 강원도 태백시 장성동 폐석적치장의 적치량과 침하관측
최은철,문지현,강태민,이훈열,Choi, Euncheol,Moon, Jihyun,Kang, Taemin,Lee, Hoonyol 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
In this study, the amount of coal waste dump was calculated using six Digital Elevation Models (DEMs) produced between 2006 and 2018 in Jangseong-dong, Taebaek-si, Gangwon-do, and the subsidence was observed by applying the Persistent Scatterer Interferometric SAR (PSInSAR) technique on the Sentinel-1 SAR images. As a result of depositing activities using DEMs, a total of 1,668,980 m<sup>3</sup> of coal waste was deposited over a period of about 12 years from 2006 to 2018. The observed subsidence rate from PSInSAR was -32.3 mm/yr and -40.2 mm/yr from the ascending and descending orbits, respectively. As the thickness of the waste pile increased, the rate of subsidence increased, and the more recent the completion of the deposit, the faster the subsidence tended to occur. The subsidence rates from the ascending and descending orbits were converted to vertical and horizontal east-west components, and 22 random reference points were set to compare the subsidence rate, the waste rock thickness, and the time of depositing completion. As a result, the subsidence rate of the reference point tended to increase as the thickness of the waste became thicker, similar to the PSInSAR results in relation to the waste thickness. On the other hand, there was no clear correlation between the completion time of the deposits and the rate Of subsidence at the reference points. This is because the time of completion of the deposits at all but 5 of the 22 reference points was too biased in 2010 and the correlation analysis was meaningless. As in this study, the use of DEM and PSInSAR is expected to be an effective alternative to compensate for the lack of field data in the safety management of coal waste deposits.
최은철(Euncheol Choi),김옥배(Ok Bae Kim),오영기(Young Kee Oh),김미영(Mi Young Kim),여창기(Chang Ki Yeo),변상준(Sang Jun Byun),박승규(Seung Gyu Park),김진희(Jin Hee Kim) 대한두경부종양학회 2014 대한두경부 종양학회지 Vol.30 No.2
Background and Objectives:To investigate the prognostic factors and effectiveness of radiotherapy for oro-pharyngeal cancer. Material and Methods:Forty seven patients in oropharyngeal cancer treated with radiothera-py between November 1989 and October 2010. Conventional radiotherapy was performed until July 2007 and conformal radiotherapy was performed since August 2007. Median age of patients was 59. Thirty five patients were males. Nine patients had operation. Patients treated with postoperative radiotherapy were delivered median 60 Gy and patients treated with definitive radiotherapy were delivered median 66 Gy. Median follow-up periods were 51 months. Results: Two year and 5 year overall survival rate was 78.7% and 59.9%. Two year and 5-year locoregional recurrence free survival rate was 82.3% and 72.9%. In subgroup of definitive radiotherapy, at uni- variate analysis for overall survival, lower N stage(p=0.01), lower stage(p=0.05) and well and moderate differen-tiation(p=0.001) were statistically significant. At univariate analysis for locoregional recurrence free survival, lower T stage(p=0.02) and better differentiation(p=0.043) were statistically significant. Treatment failure occurred in 12 patients. Locoregional recurrence(8 patients) was main pattern of failure. Conclusion:When definitive ra-diotherapy compared with postoperative adjuvant radiotherapy, there was no significant difference. Further stud-ies would be needed to compare definitive radiotherapy with postoperative radiotherapy. N stage, stage and dif-ferentiation could be the prognostic factors for overall survival and T stage and differentiation could be the prognostic factors for locoregional recurrence free survival in patients treated definitive radiotherapy.
Readout 회로의 구조를 반영한 적외선 영상의 불균일 보정기법
최은철(Euncheol Choi),강문기(Moon Gi Kang) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
FPA (Focal Plane Arrary)를 이용한 적외선 영상 획득 시스템에서 발생하는 주요 잡음 중 하나는 영상에 존재하는 공간적 고정 패턴잡음(SFPN, Spatial Fixed Pattern Noise)이다 이것이 발생하는 주된 요인은 배열을 이루고 있는 각 검출기들과, FPA 출력단에 있는 증폭기의 입출력 응답이 균일하지 않고, 시간이 흐름에 따라 그 응답특성이 변화하기 때문이다. 이 문제를 극복하기 위하여 일반적으로 교정기반 불균일 보정 방법 (CBNUC, Calibration Based Nonuniformity Correction)과 장연기반 불균일 보정방법(SBNUC, Scene Based Nonuniforrnity Correction)이 사용된다. 본 논문은 CBNUC를 사용하는 시스템의 FPA 출력단 회로에 구성된 복수의 증폭기에 존재하는 이득의 차이 및 잡음에 의한 불균일을 보정하기 위한 보간 기법을 제안한다. 실험을 통하여 제안한 기법이 CBNUC 기반 적외선 영상 시스템에서 발생하는 규칙적인 패턴의 SFPN올 효율적으로 제거하는 것을 확인하였다. 또한, 제안한 기법은 CBNUC 기반 적외선 영상 시스템에서 주기적으로 수행해야하는 단일점보정 (OPC,One Point Correction)의 수행횟수를 줄이고, 연산량도 적어 실시간 시스템 구현이 가능하다.