K3/K3A 스테레오 영상으로 제작된 DSM 비교 분석

오관영(Kwan-Young Oh),정의천(Eui-Cheom Jeong),이광재(Kwang-Jae Lee),김윤수(Youn-Soo Kim) 대한공간정보학회 2018 한국지형공간정보학회 학술대회 Vol.2018 No.11

KOMPSAT-2 입체영상의 자동 기하 보정

오관영 ( Kwan Young Oh ),정형섭 ( Hyung Sup Jung ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.2

KOMPSAT-2와 같은 고해상 위성영상은 대상영역의 3차원 위치결정을 위하여 RPC(Rational Polynomial Coefficient)가 포함된 자료를 제공한다. 그러나 RPC로 계산된 영상기하는 일정량의 편이 (systematic errors)를 지니고 있는 상태이며, 이를 보정하기 위해서는 수 개 이상의 지상기준점(ground control point)이 필요하다. 이에 본 논문에서는 지상기준점 없이 입체영상(stereo pair)과 SRTM(Shuttle Radar Topography Mission) DEM(Digital Elevation Model) 사이의 대응점(tie point)만을 이용하여 자동으로 영상 기하를 보정하는 효과적인 방법을 제안하였다. 이러한 방법은 4가지 단계를 포함 한다: 1) 대응점 추출, 2) 대응점에 대한 지상좌표 결정, 3) SRTM DEM을 이용한 지상좌표의 보정, 4) RPC 보정 모델의 파라미터 결정. 우리는 KOMPSAT-2 입체영상을 이용하여 제안된 방법의 성과를 입증하였다. 검사점 (check point)을 통해 계산된 RMSE(Root Mean Square Error)는 X와 Y, Z방향으로 각각 약 3.55 m, 9.70 m, 3.58 m를 나타냈다. 이는 SRTM DEM을 이용하여 RPC가 지닌 편이를 X, Y 및 Z 모든방향에 대하여 10 m이내의 정확도로 자동보정할 수 있다는 것을 의미한다. A high resolution satellite imagery such as KOMPSAT-2 includes a material containing rational polynomial coefficient (RPC) for three-dimensional geopositioning. However, image geometries which are calculated from the RPC must have inevitable systematic errors. Thus, it is necessary to correct systematic errors of the RPC using several ground control points (GCPs). In this paper, we propose an efficient method for automatic correction of image geometries using tie points of a stereo pair and the Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM) without GCPs. This method includes four steps: 1) tie points extraction, 2) determination of the ground coordinates of the tie points, 3) refinement of the ground coordinates using SRTM DEM, and 4) RPC adjustment model parameter estimation, We validates the performance of the proposed method using KOMPSAT-2 stereo pair. The root mean square errors (RMSE) achieved from check points (CPs) were about 3.55 m, 9.70 m and 3.58 m in X, Y, and Z directions. This means that we can automatically correct the systematic error of RPC using SRTM DEM.

모음비음화와 비중복음화에 대한 음운규칙과 제약접근 방식 비교

오관영 ( Oh Kwan-young ) 대한영어영문학회 2011 영어영문학연구 Vol.37 No.3

The purpose of this study is to show that when we treat vowel nasalization and degemination with coalescence, constraint-based approaches can be explained better than rule-based approaches from the comparison of two phonological approaches. For vowel nasalization I first analyze it by applying a nasalization and a nasal deletion rule in sequence, and then a transformational rule, but these are still inadequate from the viewpoint of coalescence and also can’t capture the functional unity of rules. Instead I can explain this nasalization appropriately by using constraints and setting a new constraint, which blocks the nasalized vowel plus nasal consonant sequence. For degemination, first I analyze it by using the assimilation rule and cluster simplification and then the transformational rule, but all are unsatisfactory in explaining degemination as coalescence. Therefore I can analyze it by using some related constraints and making a new constraint, which is driven by the necessity of accounting for the assimilation of the given examples. As the result, I can explain degemination more concisely and consistently than can rule-based approaches. (Chonnam National University)

영어 구개음화와 순음화 현상에 대한 조화이론적 접근

오관영 ( Kwan Young Oh ) 21세기영어영문학회 2011 영어영문학21 Vol.24 No.2

This paper argues that a Harmonic approach having level structures has more explanatory adequacy than generative analyses which stipulate intermediate steps, and also lack generalization for palatalization and labialization in English. In the case of palatalization, SPE regards it as two phonological processes in which the palatalization rule and the /y/-deletion rule are applied orderly, but the inapplicableness of the /y/-deletion rule in isolation leads to the need for intermediate steps as well as an unnatural rule application without generalization and conciseness. On the other hand, others look at palatalization as a fusion of the phonological processes of assimilation and deletion which arise simultaneously. Fusion may thus be analyzed by a transformational rule format, like a phonological process. But analysis through the transformational rule can`t show mapping morphological information to phonological aspects or a proper sense of fusion, in which an interaction of two segments bring about a new segment, which is shared and maintained by each feature of the two segments. Therefore I adopt a Harmonic approach that is not only able to show a difference in the environment of palatalized consonants, but also explain the phenomenon without intermediate steps and rule ordering in three level-structures. In the case of labialization, the method of SPE analysis includes some questions, which are based on a determination of the underlying form and a [w]-insertion rule. As an alternative to that, others view the labialization as a fusion, which is also analyzed by a transformational rule, in which assimilation and glide deletion are applied simultaneously. But in this case, it also can`t show a proper sense of fusion, in which I think the labialized consonant is a result that shares the manner features of one segment with the place features of the other segment. Therefore I analyze labialization in a Harmonic approach, in which I can explain it in an interlevel structure harmonically, without intermediate steps and rule ordering in three level-structures. For the generality of the phonological processes of this study, it will be necessary to further research other connected speech sounds and compare the framework used in this paper with other approaches.

아리랑 영상의 효율적 정사보정처리 연구

오관영 ( Kwan-young Oh ),이광재 ( Kwang-jae Lee ),황정인 ( Jeong-in Hwang ),김윤수 ( Youn-soo Kim ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.6

본 연구의 목적은 아리랑 영상의 정사영상처리를 보다 효율적으로 개선하기 위한 것이다. 국내외 지구 관측 위성의 개발이 가속화됨에 따라 획득되는 영상의 수와 양이 급증하고 있다. 이에 획득된 영상에 대한 정사영상처리를 보다 빠르고 효율적으로 개선하기 위한 다양한 연구들이 진행되고 있다. 본 연구에서는 GPU 등 하드웨어 컴퓨팅 능력 향상을 제외하고, 알고리즘 개선을 통한 처리 효율 강화에 집중하였다. 이를 위하여 LUT 기반 RFM 방법으로 알고리즘을 개선하였으며, offset 설정에 따라 달라지는 결과를 정확도 및 시간 효율의 측면에서 비교 및 분석하였다. The purpose of this study is to efficiently improve orthorectification of KOMPSAT images. As the development of domestic and abroad earth observation satellites accelerates, the number and amounts of satellite images acquired are rapidly increasing. Accordingly, various studies are being conducted to improve orthorectification for the acquired image more quickly and efficiently. This study focused on enhancing processing efficiency through algorithm improvement, except for improving hardware computing capabilities such as GPU. Accordingly, the algorithm was improved with the LUT-based RFM method, and compared and analyzed in terms of accuracy and time-efficiency that vary depending on offset settings.

영어 lC 자음군에 관한 역사적 조명과 음운적 고찰

오관영(Oh, Kwanyoung) 한국영어어문교육학회 2010 영어어문교육 Vol.16 No.4

The purpose of this study is to investigate /I/-deletion in IC clusters which are composed of a lateral followed by consonants at syllable-final position in English. For this, I have analyzed /I/-deletion in words depending on conditions and theoretical analyses such as Sonority Sequencing Generalization, Cluster Simplification, Complex sounds and merger, and Feature Geometry, but they didn't offer a very satisfactory explanation to the phenomenon. Therefore, I adopted a historical approach in order to determine the cause and origin of /I/-deletion in IC clusters, and then as a phonological analysis tool, I relied on the constraints and their ranking in Optimal Theory framework for explaining /I/-deletion in the clusters more consistently. As a result, I can explain the phenomenon more explicitly than from the above mentioned analyses.

임신 28 주에서 36 주 사이의 조기분만에서 쌍태임신과 단태임신의 주산기 예후 비교

오관영(Kwan Young Oh),박미혜(Mi Hye Park),양윤석(Yun Seok Yang),황인택(In Taek Hwang),박준숙(Joon Suk Park) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.10

목적 : 28주에서 36주 사이에 조기 분만한 산모를 대상으로 쌍태임신과 단태임신의 주산기 예후를 비교 하고자 하였다. 연구 방법 : 1996년 1월에서 2000년 12월 사이에 대전 을지대학병원에서 출생한 28주 이상 36주 사이의 조기 분만을 한 산모를 대상으로 쌍태임신 80명, 단태임신 402명의 진료기록을 분석하였다. 결과 : 1. 임신과 동반한 합병증은 임신중독증의 경우 단태임신에서 11.7%, 쌍태임신에서 12.5%, 태반 조기박리의 경우 0.75%: 1.25%로 유의한 차이가 없었고, 빈혈은 14.7%: 44.3%로 쌍태임신에서 유의한 차이로 증가되어 있음을 알 수 있었다 (p<0.05). 2. 단태아의 출생체중은 2368±504 g, 제1 태아 2198±402 g, 제2 태아 2184±402 g으로 단태아가 제1, 제2 태아보다 유의하게 증가되어 있었다. 그러나 제1, 제2 태아간의 출생체중은 유의한 차이가 없었다 (p<0.05). 3. 단태임신과 쌍태임신의 유리질막증 질환, 뇌실내 출혈, 미숙아 망막증, 선천적 기형 등의 빈도는 두 그룹 사이에 유의한 차이는 없었다. 그러나 황달의 빈도는 단태아에서 제1, 제2 태아보다 많았고, 폐혈증의 경우 제2 태아보다 단태아가 많았다. 뇌실내 출혈은 제1 태아에서 단태아보다 많았으나, 쌍태아간 차이는 없었다. 그러나 전체 유병일과 주산기 사망률은 3그룹 사이에 유의한 차이가 없었다. 결론 : 조기분만시 쌍태임신과 단태임신에서 출생한 신생아의 주산기 예후는 유의한 차이를 보이지 않았다. Objective : To compare the perinatal outcomes in twin and singletone pregnancies delivered prematurely between 28 and 36 weeks gestational age. Methods : We studied 80 pairs of twin delivered between 28 weeks and 36 weeks gestational age at Eulji university hospital between January 1996 and October 2000. The perinatal morbidity and mortality in premature twin pregnancies were compared to those of premature singleton pregnancies (N=402). Results : The premature twin pregnancies had no significant differences of gestational age at delivery than those of singleton pregnancies, but significantly lower mean birth weight. In mean day of hospital stay, 1 and 5 min Apgar scores, there were no significant differences. There were no significant differences in the incidence of neonatal morbidity such as hyaline membrane disease, and retinopathy of prematurity, between the two groups. And also the perinatal mortality was not significantly different between the two groups. Conclusion : There were no significant differences in perinatal mortality and morbidity between the two groups.

수정된 CS 기법을 통한 향상된 영상융합 알고리즘

오관영(Oh, Kwan Young),정형섭(Jung, Hyung Sup),이하성(Lee, Ha-Seong) 한국측량학회 2014 한국측량학회 학술대회자료집 Vol.2014 No.4

본 논문에서는 널리 사용되고 있는 Component-Substitution 기반의 영상융합 기법을 보완한 보다 효과적인 영상융합 기법을 제안하였다. 제안된 방법은 크게 두 가지 단계로 구분할 수 있다. 첫 번째는 가중 평균된 다분광 영상을 이용한 Intensity 영상의 제작 단계, 두 번째는 최적화된 융합 계수를 통한 고주파 component의 생성 단계이다. 본 알고리즘의 평가를 위해서 KOMPSAT-3 위성영상에 알고리즘을 적용하였고, 기존의 영상융합 알고리즘에 비하여 공간적/분광적인 측면에서 모두 향상된 결과를 나타냄을 확인할 수 있었다. we propose the image fusion method compensated to create high resolution MS image more advanced and enhanced. The proposed method is based on the well-established component substitution (CS) approach. Our method is organized into two parts. The first step is the construction of the intensity image as the weighted average of the MS image. The next step is to produce the weighted high-frequency component, acquired by product of the optimal parameter and high-frequency component. The proposed method is applied to the KOMPSAT-3 satellite. The qualitative and quantitative results showed that proposed method can improve the spectral/spatial quality compared with the previous fusion algorithms.

모음 삽입현상에 대한 재분석

오관영 ( Oh Kwan-young ) 대한영어영문학회 2006 영어영문학연구 Vol.32 No.1

The purpose of this paper is to explain the vowel epenthesis arising in both plural noun forms and past-tense verb forms. At first I adopted a rule-based approach for analyzing the phonological phenomena, but there were a few analytical problems. Next I considered a hierarchical feature method as an alternative. In this analytical process, I explained how the Obligatory Contour Principle (hereinafter, OCP) works within the framework of hierarchical feature method. In this paper, I will show that the OCP, which may be a rule-trigger or a rule-blocker in rule application, plays an important role in the vowel insertion rule as the rule-blocker. Although these give us some understanding about vowel insertion, they don’t provide a completely satisfying explanation for the phenomenon. Therefore, I adopted a new approach based on the Optimality Theory, which provides us a synthetic explanation by using some constraints and ranking these appropriately without depending on rule-ordering and derivation. (Yosu National University)

KOMPSAT-2 전정색영상과 다중분광영상의 융합기법 비교평가

오관영 ( Kwan Young Oh ),정형섭 ( Hyung Sup Jung ),이광재 ( Kwang Jae Lee ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1

본 연구의 목적은 KOMPSAT-2 위성영상에 가장 일반적으로 적용 가능한 영상융합기법을 제시하는 것이다. 가장 널리 사용되는 영상융합기법인 HPF, modified IHS, pan-sharpened, wavelet을 지역적, 계절적 특성이 서로 다른 4장의 KOMPSAT-2 위성영상에 적용하였고, 각각의 융합결과를 공간적, 분광적으로 비교분석 하였다. 영상융합기법의 품질평가는 시각적 분석과 정량적 분석을 병행하여 수행하였으며, 정량적 분석에는 spatial ERGAS, spectral ERGAS, SAM, Q4가 사용되었다. 종합적인 분석결과를 고려할 때, pan-sharpened가 색상정보와 공간정보의 균형적인 보존 측면에서 다른 융합기법들에 비해, 상대적으로 우수한 결과를 나타냈다. modified-IHS의 경우, 공간정보는 잘 보존하였지만 다소 큰 색상 왜곡이 발생되었고, HPF와 wavelet은 색상 왜곡은 적었지만, 공간정보의 왜곡이 발생하였다. The objective of this study is to propose efficient data fusion techniques feasible to the KOMPSAT-2 satellite images. The most widely used image fusion techniques, which are the high-pass filter (HPF), the intensity-hue-saturation-based (modified IHS), the pan-sharpened, and the wavelet-based methods, was applied to four KOMPSAT - 2 satellite images having different regional and seasonal characteristics. Each fusion result was compared and analyzed in spatial and spectral features, respectively. Quality evaluation of image fusion techniques was performed in both quantitative and visual analysis. The quantitative analysis methods used for this study were the relative global dimensional error (spatial and spectral ERGAS), the spectral angle mapper index (SAM), and the image quality index (Q4). The results of quantitative and visual analysis indicate that the pan-sharpened method among the fusion methods used for this study relatively has the suitable balance between spectral and spatial information. In the case of the modified IHS method, the spatial information is well preserved, while the spectral information is distorted. And also the HPF and wavelet methods do not preserve the spectral information but the spatial information.