탄성파 수직반사자료의 역산 연구

양동우,양승진,장성형,Yang, Dong Woo,Yang, Seung Jin,Jang, Seong Hyeong 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.5

In this paper a numerical experiment is conducted to determine the low acoustic impedance of a thin oil or gas reservoir from a seismogram by using the generalized linear inversion method. The seismograms used are normal incident synthetic seismograms containing p-wave primary reflections, multiples, and peg-leg multiples on the layers consisting of oil-, gas-, water-filled sandstone incased in shales. In this experiment the acoustic impedance, the location of reservoir boundary, thickness, and source wavelet are assumed initially and revised iteratively by the least-squares-error technique until the difference between the seismogram and calculated one is very small. This experiment shows that the acoustic impedance and thickness, about 10 m thick, can be determined by the inversion.

보령 학성리 갯벌 조간대 대형저서동물 군집구조 분석

양동우,이정호,김하련,배한나,박진순,김혜선,YANG, DONGWOO,LEE, JUNG-HO,KIM, HARYUN,BAE, HANNA,PARK, JINSOON,KIM, HYE SEON 한국해양학회 2021 바다 Vol.26 No.3

본 연구는 충남 보령 학성리 갯벌 조간대에서 대형저서동물의 시·공간적 분포 및 군집구조를 파악하고, 환경요인에 따른 군집구조 변동을 알아보고자 하였다. 현장조사는 2016년-2017년에 계절별로 9개 정점에서 캔코어(13 cm × 22 cm × 30 cm)를 이용하여 각 정점마다 3회 반복 채취 수행하였다. 퇴적환경은 전반적으로 니질 함량이 60% 이상이었으며, 유기물 함량은 평균 2.3%이었다. 대형 저서동물은 총 79종이 출현하였고, 평균서식밀도는 611 ind./m², 평균생물량은 64.1 gWWt/m²이었다. 상위 우점종은 니질 갯벌에 서식하는 고리버들갯지렁이(Heteromastus filiformis), 칠게(Macrophthalmus japonicus)와 쏙(Upogebia major)이며, 서식밀도는 각각 297 ind./m²(48.6%), 62 ind./m²(10.1%), 42 ind./m²(6.9%)으로 나타났다. 집괴분석으로 분류된 3개의 정점군은 물리·화학적인 환경요인 보다는 생물상호 작용과 우점종 출현비율 등으로 구분되었으며, nMDS 분석으로 살펴본 대형저서동물 군집은 계절적 변동양상을 보였다. This study was carried out to investigate temporal and spatial distribution of macrobenthic community and elucidate effects of environmental factors on change of community structure in an intertidal flat, Hakseong-ri, Boryeong, Korea. Field surveys were seasonally conducted to collect samples of sediment and macrobenthos using can core in triplicate at nine stations in 2016 and 2017. Our results showed that sediment had high mud content (above 60%) in most samples and mean content of loss on ignition was 2.3% in 2016. A total of 79 species was collected in the study site during the study period. Mean density and biomass were 611 ind./m² and 64.1 gWWt/m², respectively. Heteromastus filiformis was the dominant species (48.6%, 297 ind./m²) followed by Macrophthalmus japonicus (10.1%, 62 ind./m²) and Upogebia major (6.9%, 42 ind./m²). Three assembly groups resulted from cluster analysis were more distinguished by interaction between organisms and frequency of dominant species than by physical and chemical environment characteristics. In addition, macrobenthic community in the Hakseong intertidal flat showed seasonal changes based on non metric multidimensional scaling using species abundance.

기술공급자(R&D기관)의 기술이전애로요인에 관한 기초연구

양동우(Yang, Dong-Woo),김수정(Kim, Soo-Jung) 대한경영학회 2008 大韓經營學會誌 Vol.21 No.1

당뇨병에서 양측성 전부허혈성시신경병증

양동우 ( Yang Dong U ),이수형 ( Lee Su Hyeong ),김인택 ( Kim In Taeg ),윤성욱 ( Yun Seong Ug ) 대한안과학회 2004 대한안과학회지 Vol.45 No.2

벤처의 기술평가와 경영성과의 관계에 관한 연구

양동우 ( Yang Dong U ) 한국지식경영학회 2003 지식경영연구 Vol.4 No.1

초기 중소벤처의 기술혁신역량과 기업성과의 관계에 관한 연구

양동우 ( Dong Woo Yang ) 한국지식경영학회 2006 지식경영연구 Vol.7 No.1

정부기술료에 대한 기업규모별 기업선호도 실증분석

양동우(Yang, Dong-woo) 한국콘텐츠학회 2011 한국콘텐츠학회 종합학술대회 논문집 Vol.9 No.1

제1부 학술발표 및 토론 : 중소벤처 평가지표와 부실위험 관계에 관한 연구

양동우 ( Yang Dong U ) 한국중소기업학회 2004 한국중소기업학회 춘계학술발표논문집 Vol.2004 No.-

농업생태계(밭 경작지)의 경작환경에 따른 C₄ 식물의 출현 양상

양동우 ( Yang Dongwoo ),이은정 ( Eunjeong Lee ),이진주 ( Jinju Lee ),김민섭 ( Min-seob Kim ),한동욱 ( Donguk Han ),김명현 ( Myung-hyun Kim ),조광진 ( Kwang-jin Cho ),오영주 ( Young-ju Oh ),박상규 ( Sangkyu Park ) 한국하천호수학회(구 한국육수학회) 2016 생태와 환경 Vol.49 No.2

본 연구는 농업생태계에 출현하는 C₄ 식물의 출현 양상을 파악하기 위하여 2013년 여름과 가을, 2회에 걸쳐 전국 222 지점의 밭 경작지에서 식물상 및 경작환경을 조사하였으며, 광합성 유형을 판단하기 위해 주요 출현 종에 대한 Kranz 구조 확인과 탄소 안정동위원소 분석을 실시하였다. 밭 경작지에 출현하는 C₄ 식물은 9과 33속 54종이었으며 주요 출현종은 쇠비름, 바랭이, 돌피 등이었다. 조사시기와 생육지 유형에 상관없이 밭 경작지에 출현하는 C₃, C₄ 식물은 출현하는 전체 종수의 일정 비율로 출현하는 경향을 보였다. C₄ 식물의 출현 종수의 변동폭은 크지 않았으며, C₄ 식물의 출현율은 C₄ 식물의 출현 종수보다 C₃ 식물의 출현 종수에 의한 영향을 크게 받았다. 경작면적은 C₄ 식물의 출현율에 영향을 미치지 않았으며 여러 제초방법의 동시 시행은 C₃ 식물의 출현 종수를 감소시켰다. 특히 예취는 C₃ 식물 출현 종수에 큰 감소를 가져왔다. 반면 재배작물수의 증가는 C₃, C₄ 식물의 출현 증가를 가져왔으나 C₄ 식물의 출현율에는 큰 영향을 주지 않았다. 본 연구를 통해 농업생태계에서 다른 생태계에 비해 높은 C₄ 출현율을 보인 이유는 경작활동에 의한 C₃ 식물 출현 종수의 감소에 따른 것으로 사료된다. To elucidate occurrence patterns of C₄ plants in agroecosystems, we surveyed flora inside fields and embankments in 222 sites in farming lands in summer and fall, 2013. We also observed Kranz anatomy and analyzed carbon stable isotope to classify photosynthesis types. Our study observed total 54 species of C₄ plants in 33 genera and 9 families of vascular plants besides cultivated crops occurring in farming fields. The most common species was Portulaca oleracea L. followed by Digitaria ciliaris and Echinochloa crusgalli (L.) P. Beauv. var. crusgalli among the C₄ plants. The ratios of C₃ and C₄ species number to total number of species tended to maintain constant regardless of survey times and habitat types. The proportion of C₄ species to the total number of species were more influenced by the number of C₃ species than those of other types in the surveyed sites. Sizes of cultivation areas did not affect the proportions of C₄ plants. Increasing number of simultaneous weeding methods, especially with cutting method, appeared to decrease the number of C₃ plants. On the other hand, as the number of cultivated crops increased, both C₃ and C₄ plants increased but the proportions of C₄ species remained. We interpret our results that proportion of C₄ species in agroecosystems, appear to be dependent on the number of C₃ species, which in turn, appear to be affected by cultivation methods.

아파트 단지의 보행효율성에 관한 연구

양동우(Yang, Dongwoo),유상균(Yu, Sang-Gyun) 대한건축학회 2018 대한건축학회논문집 Vol.34 No.11

This study aims to investigate how easy pedestrians get around within/through the “Apartment Complexes (AC), “ a common style of high-rise multi-family housing in Korea. Over the past six decades, the AC has been the most conventional way to provide standardized housing efficiently to address the problems of the shortage of housing and the substandard housing, due to the explosion of urban population with the rapid industrialization. The AC is a huge chunk of homeogenous multi-family housing, mostly condos with decent infrastructure, including parks, pedestrian passages, schools, ect. Both in the new town development and urban renewal programs have utilized the advantages of the AC. Since the design principals of AC tend to adopt the ”protective design“ to prevent cars and pedestrians coming outside from passing it, it has been criticised for dissecting the continuity of socioeconomic context in neighborhoods. The neo-traditional planning urbanists, including Jane Jacobs, emphasize that smaller blocks and grid road newtworks are the key in improving social, cultural, and economic vitality of the neighborhoods, because these design concepts allow more pedestrians and different types of people to be mixed in a neighborhood. In this study, we first adopted objective measures for pedestrian accessibility and pedestrian efficiency. These measures were used to calculate the lengths of shortest paths from residential buildings to the dges of AC. We tested the difference in shortest paths between the current pedestrian networks of AC and hypothetical grid networks on the AC, and the relative difference is considered as the pedestrian efficiency, using the network analysis function of Geographic Information Systems (GIS) and Python programming. We found from the randomly selected 30 ACs that the existing non-grid road networks in ACs are worse than the hypothesized grid networks, in terms of pedestrian efficiency. In average, pedestrians in AC with the conventional road networks have to walk than 25%, 26%, and 27% longer than the networks of 125×45m, 100×45m, and 75×45m, respectively. With the t-test analysis, we found the pedestrian efficiency of AC with the conventional network is lower than grid-networks. Many new urbanists stress, easiness of walking is one of the most import elements for community building and social bonds. With the findings from the objective measures of pedestrian accessibility and efficiency, the AC would have limitations to attract people outside into the AC itself, which would increase dis-connectivity with adjacent areas.