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비선형 시계열 하천생태모형 개발과정 중 시간지연단계와 입력변수, 모형 예측성 간 관계평가
정광석,김동균,윤주덕,라긍환,김현우,주기재,Jeong, Kwang-Seuk,Kim, Dong-Kyun,Yoon, Ju-Duk,La, Geung-Hwan,Kim, Hyun-Woo,Joo, Gea-Jae 한국하천호수학회 2010 생태와 환경 Vol.43 No.1
In this study, we implemented an experimental approach of ecological model development in order to emphasize the importance of input variable selection with respect to time-delayed arrangement between input and output variables. Time-series modeling requires relevant input variable selection for the prediction of a specific output variable (e.g. density of a species). Inadequate variable utility for input often causes increase of model construction time and low efficiency of developed model when applied to real world representation. Therefore, for future prediction, researchers have to decide number of time-delay (e.g. months, weeks or days; t-n) to predict a certain phenomenon at current time t. We prepared a total of 3,900 equation models produced by Time-Series Optimized Genetic Programming (TSOGP) algorithm, for the prediction of monthly averaged density of a potamic phytoplankton species Stephanodiscus hantzschii, considering future prediction from 0- (no future prediction) to 12-months ahead (interval by 1 month; 300 equations per each month-delay). From the investigation of model structure, input variable selectivity was obviously affected by the time-delay arrangement, and the model predictability was related with the type of input variables. From the results, we can conclude that, although Machine Learning (ML) algorithms which have popularly been used in Ecological Informatics (EI) provide high performance in future prediction of ecological entities, the efficiency of models would be lowered unless relevant input variables are selectively used.
낙동강(한국)의 세 지류에서 포식 윤충류 개체군 동태 및 초식 윤충류 군집에 미치는 영향
김현우 ( Hyun Woo Kim ),장광현 ( Kwang Hyeon Chang ),신운균 ( Woon Kyun Shin ),라긍환 ( Geung Hwan La ),정광석 ( Kwang Seuk Jeong ),주기재 ( Gea Jae Joo ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
The herbivorous rotifers community (Brachionus spp.) and population dynamics of the predator rotifer (Asplanchna spp.) in three tributaries (Kumho R., Nam R., and Hwang R.) of the Nakdong River were evaluated on biweekly intervals from Jan. 2001 and Dec. 2002. High abundance of the herbivorous rotifers (peak density: - ca. >1000 Ind. L^(-1)) was observed from two tributaries (Kumho R. and Nam R.) during the spring and fall seasons, respectively. The high peaks of herbivorous rotifers were not evident in one tributary (Hwang R.). Among the herbivorous rotifers, brachionid rotifers (Brachionus spp. consisting of 7 species) were the characteristic rotifer community in this study. Brachionus spp. tended to occur together with the other perennial species, Asplanchna. Asplanchna was also present while two species of B. angularis and B. calyciflorus were highest in density. Subsequently, two populations (B. angularis and B. calyciflorus) rapidly declined, becoming rare after high peaks of Asplanchna occurred, except in one tributary (Hwang R.). We found community shifts in rotifer groups in mid-spring and mid-fall at the study site. The Asplanchna population could be appeared to play an important role in regulating the rotifer community and total plankton biomass in spring and fall at high trophic levels.
베트남 하노이 소재 한국 아파트 현지 거주민의 거주유형과 특성분석
손동화(Shon, Donghwa),최재필(Choi, Jaepil),정광석(Jeong, Kwang-seuk) 대한건축학회 2017 대한건축학회논문집 Vol.33 No.11
As the construction industry continued to depress due to the saturation of the Korean housing market, the Korean company expanded their business to overseas markets. However, since it is the position of a cultural outsider who can not fully understand the local residential culture, the business is often performed in the same way as in Korea. H apartment buildings in Hanoi, Vietnam, have almost the same structure as a unit plan for Korean apartments. Residents living in H apartments, which are different from Vietnamese traditional houses or apartments, are experiencing differences in contrast to their residential culture. Through residents, the satisfaction of the unit plan of Korean apartment could grasp whether they satisfy or not. This will be a chance for a new culture to be created from the viewpoint of residents of Vietnam, also providing a way for Korean apartments to settle in the country with less risk. The purpose of this study is to identify the factors affecting the satisfaction level of Vietnamese households living in a Korean apartment building constructed by a Korean company in Vietnam and analyze it from a cultural point of view. For this purpose, a Post Occupancy Evaluation (P.O.E) was conducted or 63 residents in Vietnam. Data mining was conducted on the datasheet with physical and resident attributes, and the residence type and characteristics were analyzed. The factors affecting the satisfaction obtained through the analysis was to derive meaning through in-depth interviews with literature and traditional Vietnamese homes and apartments residents of Korea. As a result of the analysis, the types of residents’ characteristics were analyzed for four groups. And the study analyzes the causes of dissatisfaction and satisfaction with environmental factor and spatial factor through variable analysis. Also, it is confirmed that the Vietnamese residential culture.
국내 주요 강 생태계 내 동물플랑크톤의 탄소, 질소, 인 비율 해석
김현우 ( Hyun Woo Kim ),라긍환 ( Geung Hwan La ),정광석 ( Kwang Seuk Jeong ),김동균 ( Dong Kyun Kim ),황순진 ( Soon Jin Hwang ),이재용 ( Jaeyong Lee ),김범철 ( Bom Chul Kim ) 한국하천호수학회(구 한국육수학회) 2013 생태와 환경 Vol.46 No.4
The amounts of carbon (C), nitrogen (N) and phosphorus (P) in relation to dry weight (D.W.) were measured in zooplankton from the large four rivers (Han R., Geum R., Yeongsan R. and Seomjin R.) during 2004~2008. The stoichiometry of total zooplankton in four river systems was highly variable. The ranges of average C, N and P-contents were 70~620 mgC mg-1 D.W., 7.1~85.5 μgN mg-1 D.W. and 2.5~7.4 μgP mg-1 D.W., respectively. The mean C:N: P atomic ratios reflected large spatial differences. The C: P and N: P ratios of the zooplankton community ranged from 38 to 392: 1 and from 4 to 65: 1 in all sampling sites. Self- Organizing Map (SOM) was applied to the survey data, and the study sites were clearly classified into 3 clusters. Clustering was largely affected by the distribution pattern of C, N, P-contents, which is related with characteristics of river systems on the basis of stoichiometry.
우포늪의 미소갑각류 군집 동태강우량 및 이화학적 요인이 미소갑각류 군집 분포에 미치는 영향
최종윤 ( Choi Jong Yun ),김성기 ( Kim Seong Ki ),나긍환 ( La Geung Hwan ),정광석 ( Jeong Kwang Seuk ),김현우 ( Kim Hyun Woo ),김태규 ( Kim Tae Kyu ),주기재 ( Joo Gea Jae ) 한국하천호수학회 2012 생태와 환경 Vol.45 No.3
The relationships between environmental factors and the dynamics of the microcrus-tacean community, including planktonic or epiphytic or epiphytic cladocerans and copepods, were studied at Upo Wetlands from 2001 to 2010.Among 10 identified cladoceran taxon, epiphytic cladocerans (Alona, Camptocercus, Simocephalus, Diaphanosoma, Sida)and planktonic claadocerans (Bosmina, Ceriodaphnia, Daphnia, Moina, Scapho-leberis) showed distinctive patterns in appearance throughout the year. Overall,epi-phytic cladocerans were more abundant during the aquatic plant development season (May to Nov.),planktonic cladocerans were similarly distributed throughout the sea-sons,but showed a lower density than epiphytic cladocerrans. The seasonal changes in copepods abundance showed a similar seasonal pattern when compared to epiphytic cladocerans. Planktonic cladocerans showed no significant relationship to rainfall and physic-chemical factors, while epiphytic cladocerans exhibited a distinct relationship with rainfall and water temperature(n=120,p<0.01),and a negative relationship with pH and conductivity (n=120,p<0.05).Among the epiphytic cladocerans, the Alona and Diaphanosoma showed a distinctive correlation with environmental factors, and their density was affected by rainfall and water temperature(n=120,p<0.01).Copepods had a positive relationship with rainfall(n=120,p<0.01)and water temperature(n=120,p<0.05).In conclusion, changes in rainfall and water temperature can affect the seasonal changes of microcrustacean community and abundance in Upo Wetlands.
동물플랑크톤의 서식 특성에 따른 분류와 먹이망: 상위포식자의 에너지원으로서 부착성 동물플랑크톤의 중요성
최종윤 ( Jong Yun Choi ),나긍환 ( Geung Hwan La ),정광석 ( Kwang Seuk Jeong ),김성기 ( Seong Ki Kim ),장광현 ( Kwang Hyeon Chang ),주기재 ( Gea Jae Joo ) 한국하천호수학회(구 한국육수학회) 2012 생태와 환경 Vol.45 No.4
We conducted a comprehensive monitoring for freshwater food web in a wetland system (Jangcheok Lake), from May to October, 2011. Monthly sampling for zooplankton, fish as well as organic matters, was implemented. In order to understand the food web structure and energy flow, we applied stable isotope analysis to the collected samples, based on δ13C and δ15N values of epiphytic particulate organic matter(EPOM) and particulate organic matter (POM), epiphytic and planktonic zooplankton, fish (Lepomis macrochirus). In the study site, epiphytic and planktonic zooplankton was 24 and 30 species, respectively, and coincidence species between epiphytic and planktonic zooplankton were 20 species. Epiphytic zooplankton were more abundant during the spring and early summer (May to July); however, planktonic zooplankton were more abundant during the autumn (September to October) season. Stable isotope analysis revealed that fish and epiphytic zooplankton had seasonal variations on their food sources. EPOM largely contributed epiphytic zooplankton in spring (May), but increasing contribution of POM in autumn (September) was detected. However, planktonic zooplankton depended on only POM in both seasons. Fish utilized both epiphytic and planktonic zooplankton, but small sized (1~~3 cm), fish preferred epiphytic zooplankton, where as larger sized (4~~7 cm) fish tended to consume planktonic zooplankton, and epiphytic zooplankton had important role in energy transfer. This pattern was clear when results of spring and autumn stable isotope analysis were compared. From the results of this study, we confirmed that wetlands ecosystem supported various epiphytic and planktonic zooplankton species, they depend on other food items, respectively. L. macrochirus also showed a difference of food source according to the body size, they depend on seasonal density change of zooplankton. In particular, epiphytic zooplankton was very important for growth and development of young fish in the spring.