하계 한반도 해역(동해, 서해, 남해 및 동중국해)의 하위영양단계 먹이망 구조 : 탄소 및 질소 안정동위원소 활용

민준오,이창화,윤석현,Min, Jun-Oh,Lee, Chang-Hwa,Youn, Seok-Hyun 해양환경안전학회 2020 해양환경안전학회지 Vol.26 No.5

본 연구는 2019년 8월 한반도 주변해역(동해, 서해, 남해, 동중국해)에서 탄소 및 질소 안정동위원소 기법을 활용하여 하위영양 단계에서의 먹이망 구조를 파악하였다. 입자성 유기물(POM)의 δ¹³C 범위는 -26.18 ~ 20.61 ‰, δ¹⁵N 범위는 5.36 ~ 15.20 ‰의 넓은 범위를 보였다. POM과 각 생물별 개체군 사이의 δ¹³C 분별작용의 결과는 대부분 micro-POM을 섭식하는 것으로 확인하였으나 해역 간 차이를 보였다. 각 생물별 영양단계는 chaetognaths (3.40±0.61)가 가장 높은 영양단계에 있음을 확인하였다. 동위원소 혼합모델을 적용한 결과에서 chaetognaths의 먹이원으로 copepods (13 ~ 48 %)와 euphausiids (20 ~ 51 %)가 가장 높은 기여도를 나타냈다. 본 연구결과 각 해역별 먹이원의 제한적 공급 및 다양성의 차이가 먹이망 구조 및 각 생물별 동위원소 비에 영향을 미친 것으로 판단된다. Food web structures in the lower trophic levels of the seas around the Korean peninsula were investigated in August 2019 using stable isotopes. There were variable ratios of the carbon (-26.18 ~ -20.61 ‰) and nitrogen stable (5.36 ~ 15.20 ‰) isotopes in the particulate organic matter (POM). Most of the organisms ingested micro-POM as a major food source, but this varied spatially. The chaetognaths (3.40 ± 0.61) occupied the highest trophic level. The isotope mixing model showed that the proportions (13 ~ 51 %) of some organisms (i.e., copepods and euphausiids) reflected the relative contributions as major food sources for chaetognaths at each site.

SVM 결정법칙에 의한 얼굴 및 서명기반 다중생체인식 시스템

민준오,이대종,전명근,Min Jun-Oh,Lee Dae-Jong,Chun Myung-Geun 한국정보처리학회 2004 정보처리학회논문지B Vol.11 No.7

본 논문에서는 SVM에 기반을 둔 결정법칙에 의해 얼굴인식과 서명인식시스템으로 구성된 다중생체인식시스템을 제안하고자 한다. 이를 위해 퍼지 선형판별기법(Fuzzy Linear Discriminant Analysis : Fnzzy LDA)를 이용한 얼굴인식과 선형판별분석기법과 구간매칭기법을 이용한 서명인식을 구축하였다. 두 개의 단일생체인식시스템을 효과적으로 융합시키기 위해 우선 독립적인 두 개의 생체인식시스템에 의해 산출된 매칭도로부터 등록자(Genuine)와 침입자(Impostor)의 확률 분포 모델을 생성한 후, SVM(Support Vector Machine)에 의해 최종 인증하는 구조로 되어있다. 제안된 방법인 SVM기반 결정법칙을 적용하여 실험한 결과 기존에 결정법칙으로 많이 사용되고 있는 가중치합과 결정트리 방식에 비해 각각 $1.654{\%}$와 $3.3{\%}$의 인식률 향상을 나타내 제안된 방법의 우수성을 나타냈다. In this paper, we propose a multi-modal biometrics system based on face and signature recognition system. Here, the face recognition system is designed by fuzzy LDA, and the signature recognition system is implemented with the LDA and segment matching methods. To effectively aggregate two systems, we obtain statistical distribution models based on matching values for genuine and impostor, respectively. And then, the final verification is Performed by the support vector machine. From the various experiments, we find that the proposed method shows high recognition rates comparing with the conventional methods.

13C 추적자를 이용한 팔당호 수변역 부유 및 부착조류의 일차생산력과 광합성 색소 생산속도 연구

민준오,하선용,허진,신경훈 한국하천호수학회 2019 생태와 환경 Vol.52 No.3

The primary productivity and production rate of photosynthetic pigment of periphyton and phytoplankton were estimated using a 13C stable labeling technique in May 2011, in the waterfront of Lake Paldang. Primary productivity of periphyton (28.15 mgC m-2 d-1) was higher than phytoplankton production (0.14 mgC m-2 d-1). The net production rates of photosynthetic pigments (Chl a and Fucoxanthin) of periphyton were 2.53 ngC m-2 d-1 and 0.12 ngC m-2 d-1, respectively. On the other hand, the net production rate of pigments on phytoplankton (Chl a : 0.023 ngC m-2 d-1, Fucoxanthin: 0.002 ngC m-2 d-1) was lower than that of periphyton. Specific production rates of individual pigments of phytoplankton to the total primary productivity indicate the predominance of diatom (Fucoxanthin) species in phytoplankton assemblage in Lake Paldang. The net individual production rate of pigments by 13C tracer was a useful tool to estimate the contribution of each phytoplankton class for total primary productivity, and it is possible to calculate the seasonal contribution of each phytoplankton class to the total primary productivity in the aquatic ecosystems. This study is the first report on photosynthetic pigment production rates of periphyton and phytoplankton.

SVM 결정법칙에 의한 얼굴 및 서명기반 다중생체인식 시스템

민준오,이대종,전명근 한국정보처리학회 2004 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.11 No.7

본 논문에서는 SVM에 기반을 둔 결정법칙에 의해 얼굴인식과 서명인식시스템으로 구성된 다중생체인식시스템을 제안하고자 한다. 이를 위해 퍼지 선형판별기법(Fuzzy Linear Discriminant Analysis:Fuzzy LDA)를 이용한 얼굴인식과 선형판별분석기법과 구간매칭기법을 이용한 서명인식을 구축하였다. 두 개의 단일생체인식시스템을 효과적으로 융합시키기 위해 우선 독립적인 두 개의 생체인식시스템에 의해 산출된 매칭도로부터 등록자(Genuine)와 침입자(Impostor)의 확률 분포 모델을 생성한 후, SVM(Support Vector Machine)에 의해 최종 인증하는 구조로 되어있다. 제안된 방법인 SVM기반 결정법칙을 적용하여 실험한 결과 기존에 결정법칙으로 많이 사용되고 있는 가중치합과 결정트리 방식에 비해 각각 1.654%와 3.3%의 인식률 향상을 나타내 제안된 방법의 우수성을 나타냈다. In this paper, we propose a multi-modal biometrics system based on face and signature recognition system. Here, the face recognition system is designed by fuzzy LDA, and the signature recognition system is implemented with the LDA and segment matching methods. To effectively aggregate two systems, we obtain statistical distribution models based on matching values for genuine and impostor, respectively. And then, the final verification is performed by the support vector machine. From the various experiments, we find that the proposed method shows high recognition rates comparing with the conventional methods.

웨이블렛 변환과 LDA를 이용한 얼굴인식

민준오(Jun-Oh Min),고현주(Hyoun-Joo Go),전명근(Myung-Geun Chun) 한국지능시스템학회 2003 한국지능시스템학회 학술발표 논문집 Vol.13 No.2

보문 : 하계 강우기 섬진강 하구역의 일차생산력 및 식물플랑크톤 색소조성 변화

민준오 ( Jun Oh Min ),하선용 ( Sun Yong Ha ),최보형 ( Bo Hyung Choi ),정미희 ( Mi Hee Chung ),윤원득 ( Won Duk Yoon ),이재성 ( Jae Seong Lee ),신경훈 ( Kyung Hoon Shin ) 한국하천호수학회(구 한국육수학회) 2011 생태와 환경 Vol.44 No.3

Field observations and culture experiments have been carried out during the rainy season (on the 6th, 8th and 27th July 2009) to examine changes in the primary productivity and associated plant pigments in the estuary of the Seom-jin River. Primary productivity was determined at four sampling stations along the salinity gradient. On 6th July (before heavy rain) primary productivity ranged from 689~1,169 mgC m-2 d-1. On the 8th, just after more than 216.5 mm of precipitation, euphotic layers at all stations were reduced to very shallow water because of the high concentration of suspended solids in the water. This resulted in dramatically decreased primary productivity down to as low as 12~32 mg C m-2 d-1. However, after the rain, primary productivity on the 27th ranged from 266~999 mgC m-2 d-1, demonstrating a fast recovery in the upper stream water to similar productivity levels to those before the rainy season. Concentration of fucoxanthin in the water was highest on the 6th July. Before the rain, concentration of the zeaxanthin, increased as the salinity decreased. Immediately after the heavy rain, the Chl b (Chlorophytes) concentration was higher at all sites than before the rainy season. The concentration of fucoxanthin decreased after the heavy rain. At the downstream site, peridinin (Dinoflagellates) were found. During the rainy season, the diatoms contributed to the primary productivity at all sites. However, after the rainy season, Chl b (Chlorophytes) and Peridinin (Dinoflagellates) increased, demonstrating the enhanced contribution of those species in addition to diatoms.

보분: 섬진강 하구역의 계절별 일차생산력 및 식물플랑크톤 색소 조성 변화

민준오 ( Jun Oh Min ),하선용 ( Sun Yong Ha ),정미희 ( Me Hee Chung ),최보형 ( Bo Hyung Choi ),이연정 ( Yeon Jung Lee ),윤석현 ( Seok Hyun Youn ),윤원득 ( Won Duk Yoon ),이재성 ( Jae Seong Lee ),신경훈 ( Kyung Hoon Shin ) 한국하천호수학회 2012 생태와 환경 Vol.45 No.2

Four in situ incubation experiments were conducted in May, August and November 2009, as well as February 2010 to determine the seasonal primary productivity and the community structure of phytoplankton at the Seomjin estuary. The primary production of phytoplankton ranged from 9 to 3560 mgC m-2 d-1. Primary productivity was the highest in the summer season (August), which was influenced by improved optical and temperature conditions of the water, as well as the supply of nutrients derived from its surrounding watershed. Particularly, the upper station (SJ-1, SJ-2) of Seom-jin estuary showed a higher productivity, as a result of inflow of input nutrients originated from the terrestrial source. The fucoxanthin, as an index pigment of diatoms showed the highest concentration (0.74~9.51 μg L-1) at all stations, occupying 30~80% to total Chl a concentrations. The phytoplankton species composition determination, using a microscope showed similar results to the pigment analysis, which indicated diatom Skeletonema costatum, as the dominant species. The primary productivity in Seom-jin estuary indicates temporally and spatially large variation, according to different environmental conditions. Also, Skeletonema costatum has euryhaline features with relatively higher contribution.

하계 마리안 소만 빙하후퇴에 따른 식물플랑크톤 변동성 분석

심초롬,민준오,이보연,홍서연,하선용 해양환경안전학회 2023 해양환경안전학회지 Vol.29 No.5

Rapid climate change has resulted in glacial retreat and increased meltwater inputs in the Antarctic Peninsula, including King George Island where Marian Cove is located. Consequently, these phenomena are expected to induce changes in the water column light properties, which in turn will affect phytoplankton communities. To comprehend the effects of glacial retreat on the marine ecosystem in Marian Cove, we investigated on phytoplankton biomass (chlorophyll-a, chl-a) and various environment parameters in this area in December 2021 and January 2022. The average temperature at the euphotic depth in January 2022 (1.41 ± 0.13 ℃) was higher than that in December 2021 (0.87 ± 0.17 ℃). Contrastingly, the average salinity was lower in January 2022 (33.9 ± 0.10 psu) than in December 2021 (34.1 ± 0.12 psu). Major nutrients, including dissolved inorganic nitrogen, phosphate, and silicate, were sufficiently high, and thus, did not act as limiting factors for phytoplankton biomass. In December 2021 and January 2022, the mean chl-a concentrations were 1.03 ± 0.64 and 0.66 ± 0.15μg L-1, respectively. The mean concentration of suspended particulate matter (SPM) was 24.9 ± 3.54 mg L-1 during the study period, with elevated values observed in the vicinity of the inner glacier. However, relative lower chl-a concentrations were observed near the inner glacier, possibly due to high SPM load from the glacier, resulting in reduced light attenuation by SPM shading. Furthermore, the proportion of nanophytoplankton exceeded 70% in the inner cove, contributing to elevated mean fractions of nanophytoplankton in the glacier retreat marine ecosystem. Overall, our study indicated that freshwater and SPM inputs from glacial meltwater may possibly act as main factors controlling the dynamics of phytoplankton communities in glacier retreat areas. The findings may also serve as fundamental data for better understanding the carbon cycle in Marian Cove. 세종기지가 위치한 마리안 소만은 기후 변화로 인한 빙하후퇴로 다량의 융빙수가 유입되고 있다. 이러한 빙하후퇴에 따른 생태계 반응을 예측하기 위해, 해양 환경 변화의 지시자인 식물플랑크톤 생체량 및 크기 구조와 물리, 화학적 매개변수에 대한 현장 조사를 2021년 12월, 2022년 1월 두 차례 수행하였다. 2022년 1월의 수온과 염분은 평균 1.41 ± 0.13 ℃, 33.9 ± 0.10 psu로 2021년 1월의 수온과 염분인 0.87 ± 0.17 ℃, 34.1 ± 0.12 psu보다 상대적으로 고온, 저염의 양상을 보였다. 조사시기 동안 영양염류는 대체로 높은 농도를 보여 식물플랑크톤의 제한요소로 작용하지 않은 것으로 판단된다. 식물플랑크톤 생체량의 지표인 엽록소는 2021년 12월, 2022년 1월에 각각 1.03 ± 0.64 μg L-1, 0.66 ± 0.15 μg L-1로 나타났으며 부유물질은 전체 조사기간 평균 24.9 ± 3.54 mg L-1로 나타났다. 부유물질의 농도가 높은 소만 내측에서 엽록소는 낮은 농도를 보였는데 이는 융빙수로부터 유입되는 고농도의 부유물질로 인해 수층 내 빛이 강하게 제한되어 식물플랑크톤의 성장이 저해된 것으로 판단된다. 또한, 빙벽 주변 정점에서 크기가 작은 미소 식물플랑크톤이 전체 식물플랑크톤 생체량에서 70% 이상 차지하는 것으로 나타났으며 이는 융빙수 유입으로 유발된 저조도 환경에서 미소 식물플랑크톤의 기여도가 증가할 수 있음을 시사한다. 따라서 본 연구는 빙하후퇴 지역에서 유입되는 담수와 부유물질이 식물플랑크톤의 생체량 및 군집구조 조절 요인이 될 수 있음을 시사하며, 결과 자료는 추후 마리안 소만의 탄소순환 변동을 파악하는 기초자료로 활용될 수 있다.

하계 남극 킹조지섬 마리안소만에서의 유색용존유기물(CDOM) 분포

이보연,민준오,김보경,심초롬,하선용 한국해양환경·에너지학회 2023 한국해양환경·에너지학회지 Vol.26 No.3

Rapid climate change is progressing in the Antarctic coastal area and has various influences on the envi-ronmental conditions. The spatiotemporal distribution and the source of colored dissolved organic matter (CDOM) were investigated in Marian Cove, King George Island, Antarctica, during the summer season in 2019 and 2020. The temperature in 2019 and 2020 were 0.42~1.44, -0.02~2.48 ℃, respectively, while sa-linity was 34.1±0.16 psu in 2019 and 33.9±0.41 psu in 2020. Phytoplankton biomass (chlorophyll-a, Chl-a) in 2020 was 1.49±1.22 μg L-1 which was two times higher than in 2019 (0.65±0.61 μg L-1). The ab-sorption coefficient at 355 nm (aCDOM(355)) showed a wide range of 0.17~10.59 m-1 in 2019, and a sig-nificantly lower value of 0.04~0.50 m-1 in 2020. CDOM was positively correlated with salinity (rs=0.55, p<0.05) and the whole water column was vertically and horizontally well-mixed, suggesting that CDOM in Marian Cove mostly originated from the organic matter in the influent from Maxwell Bay. There may be a resuspension of sediments accompanied by tidal current or wind in the cove, which probably contribut-ed to the increase in CDOM at the bottom. These results imply that organic matter changes in Marian Cove, which exhibits narrow and shallow topography, are mainly driven by physical factors. Long-term monitoring of CDOM may provide fundamental data for understanding climate-related organic matter cycles.

추계-동계 낙동강 중 하류 보 구간 일차생산력 및 식물플랑크톤 군집조성 변화: 식물플랑크톤 색소와 CHEMTAX 활용

최지수,민준오,최보형,강재중,최광순,이상헌,신경훈 한국수생태학회(구 한국하천호수학회) 2019 생태와 환경 Vol.52 No.2