http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fine Structure of Blue-green Algae, Microcystis aeruginosa Kutzing
최민규,김백호,문연자,정연태,이종빈,위인선,Choi, Min-Kyu,Kim, Baik-Ho,Mun, Yeun-Ja,Chung, Yeun-Tai,Lee, Jong-Bin,Wui, In-Sun Korean Society of Electron Microscopy 1996 Applied microscopy Vol.26 No.4
In order to understand the morphological differences between two different organic loadings by its upstream, and to compare with other algal groups with references, the fine structure of blue-green algae, Microcystis aeruginosa Kitzing, taken from two branches, Tongbok and Bosung stream of Lake Chuam, Korea pennisula was examined. It showed extinct differences in most physicochemical factors between both branches, except water temperature and pH values. The concentrations of total phosphorus in Tongbok branch were twice as those of Bosung. M. aeruginosa cells were enumerated totally $1.2X10^4cells/ml$ and these individuals in branch of Tongbok were close to two times as much as Bosung. In light and electron microscopy, natural M. aeruginosa colonies formed irregular shape and non-directional array in amorphous matrix. They were consisted of many kinds of cells, youngs or olds in cell division, solitary, and various size of cells. Each cell ranged from 2.61 to $5.40{\mu}m$ in diameter, and averaged as $3.54{\pm}0.19{\mu}m$. In cytoplasm, they contained a number of inclusions in various size, shape and appearances. Among them, polyhedral bodies or carboxysomes, a structured granules, photosynthetic lamellae or thylakoids, and gas vacuoles were prominent and easy to recognize. Although it was failed to find the definable morphological variations in the ultrastructure of M. aeruginosa in terms of algal habitual environments, some useful characters were founded, outer layer of cell wall, polyhedral bodies and gas vacuoles, in blue-green algal classification and taxonomy. 주암호의 유입하천중 이화학적 조건이 서로 다른 보성천과 동복천에서 채집된 남조 Microcystis aeruginosa Kutzing의 미세구조에 대한 형태학적 관찰을 시행하여 다음과 같은 결과를 얻었다. 수온과 pH를 제외한 다른 환경요인들은 두지점간에 큰 차이를 보였다. M. aeruginosa의 광학 및 전자현미경적 관찰 결과, 세포는 부정형 군체를 형성하며, 투명한 점액질로 싸여 있었다. 세포는 난형 또는 구형에 가깝고, 크기는 $2.61{\sim}5.40{\mu}m$의 범위로서, 평균 $3.54{\pm}0.19{\mu}m$였다. 세포질내에는 많은 다양한 구조물을 가지고 있으며, polyhedral bodies(carboxysomes), polyphosphate, cyanophycin granules 외에 photosynthetic lamellae와 gas vacuoles 등이 비교적 뚜렷하였다. 두 채집장소간의 형태학적 차이는 보이지 않았으나, 영양염류 수준이 높은 표본에서 polyphosphate와 cyanophycin granules이 숫적 증가를 보였다. 세포분열은 이분법으로 초기에 정중앙부의 좌우로부터 합입이 일어났으며, 주로 세포벽의 제1층과 제2층이 관여하였다. 세포벽의 외부층은 크게 두가지 형태의 filaments층이 잘 발달되어 있었다.
최민규,김백호,Choi, Min-Kyu,Takamura, Noriko,Kim, Baik-Ho 한국하천호수학회 2000 생태와 환경 Vol.33 No.4
수심이 얕은 부영양호수에서 우점하는 식물플랑크톤에 대한 1년생 백련어의 섭식특성을 조사하고자, 1997년 5월 23일부터 9월 18일까지 호수의 연안에 4개의 enclosure를 설치하고, 어류투입 이후의 각 enclosure수중과 어류의 장 내용물 중의 식물플랑크톤 군집의 변화를 비교하였다. 조사기간동안 각 enclosure의 수온, 플랑크톤의 총생물량, 어류 아가미의 여과공 등은 시간에 따라 른 변화가 없었으며, 어류성장은 주로 투입된 어류의 밀도에 의존되었다. 어류의 내용물에 의하면, 저밀도 투입 enclosure에서 수중과 어류 전장간의 플랑크톤군집의 유사도가 높게 나타났으며(p<0.05), 전체적으로 모든 enclosure에서 크기가 큰(>$100,000{\mu}m^3$) 식물플랑크톤-Oscillatoria, Anabaena, Melosira등은 어류투입이후 크게 감소되지 않았다. 어류의 먹이선택지수(${\alpha}$)와 플랑크톤의 크기 (Ingestion unit)사이에도 매우 낮은 상관성을 보였다(r = 0.001, p>0.5). 식물플랑크톤의 분석결과, 백연은 남조나 녹조에 비해 규조를 더 선호하였는데, 이는 규조의 세포벽이 다른 조류에 비해 소화과정동안 쉽게 파괴되지 않고, 저배율의 현미경적시야에서도 간단히 확인된다는 점 등,선택지수를 과대평가하게 되는 단점이 있기 때문에 백련어의 먹이습성에 대한 방법론적 개선이 필요하다고 판단된다. The feeding behavior of 1-year-old silver carp, Hypophthalmichthys molitrix (Val.) on phytoplankton species in a shallow hypertrophic lake was studied from 22 May to 18 September, 1997. Over the experimental period, the filter-pore sizes of the fish, the total biomass of the phytoplankton and the water temperature in each enclosure changed little with time. The fish biomass in each enclosure increased with time, while their percentage of weight gain correlated negatively to the stocking density, due perhaps to competition for prey. An analysis of gut contents of silver carp showed a strong similarity between the algal communities in the foregut and the water, and was significant for the fish enclosure with a low density (p<0.05). The presence of silver carp rarely suppressed the abundance of phytoplankton such as Oscillatoria, Anabaena and Melosira even at high ingestion levels. There were weak relationships between the IU values of each phytoplankton and the selectivity of fish on them (r = 0.001, p>0.5). There was no doubt that the silver carp fed unselectively when cyanobacteria populations were high, even though the selectivity index for diatoms was slightly higher than those for cyanobacteria, green algae and cryptomonads. Improvements in methodologies are needed to clearly understand and generalize the feeding behavior of silver carp.
상수원의 오염에 대한 식물플랑크톤의 오수생물학적 연구 - 만경강 상류 하천 및 저수지를 중심으로 -
최민규,김백호 ( Min Kyu Choi,Baik Ho Kim ) 한국환경생물학회 1994 환경생물 : 환경생물학회지 Vol.12 No.2
Phytoplankton community and its physicochemical parameters were investigated at three reservoirs and four streams in the upper part of the Mankyeong River System from July, 1993 to June, 1994 on seasonal interval. Totally, 322 taxa were classified and composed of 33 families, 82 genera, 263 species , 52 varities and 7 forma Among them, 135 taxa of Bacillariophyceae was the highest record during this study. Total standing biomass of 1.11×10 exp (7)cells/㎖ was enumerated, and the high peak was in summer as 3.16×1010 exp (7)cells/㎖(28.5%), and also, reservoirs more higher than streams in biomass. Melosira granulata was much dominated and totally, 4.9×10 exp (5)cells/㎖ was counted As a whole, nine taxa of fourth species including Cyclotella meneghniana in streams and five taxa with Melosira varians in reservoirs were also domianted Synedra ulna and Melosira granulata were distributed either at stream or reservoirs. Species diversity indices(H` ) were showed the maximum at station 5 as above 2.0 without seasonality and the lowest at station 6 and 7 as below 1.0 in spring and summer. Similarity indices among sampling stations were the peak as 0.58 between station 4 and 5, the lowest between station 6 and 7 located at the same stream. In view of correlation between biological and physicochemical conditions at three reservoirs, station 3 and 6 were more related with organic nutrient, in other hand, station 7 was dependent with physicochemicals such as water temperature and dissolved oxygen. And also, water qualities of station and 6 with regard to total biomass of the major dominant species were ranged from oligotrophic to eutrophic, while station 3 on summer and autumn was eutrophic. The degree of pollution tolerance scores(PTS) was ranged from degree 1 to 4 Several bioindicators newly introduced, three common species were Melosira granulata, Synedra ulna and Melosira varians. Two taxa of Gomphonema olivaceum and Cyclotella meneghniana were showed only in degree 2, and also, two taxa of Achnanthes subsalsa and Melosira italica var. tenuissima were distributed only in degree 3. Microcystis aeruginosa was well dominated at eutrophic state as below degree 3. From this above results, we may evaluate the degree of water quality based on bioloical and physicochemical conditions that station 1 in summer and autumn was oligotrophic state as degree 1, station 3 in summer and winter was α-mesosaprotrophic as degree 3, and totally showed β-mesosaprotropnic as degree 2.
최민규,김백호,정연태,위인선 ( Min Kyu Choi,Baik Ho Kim,Yeun Tai Chung,In Sun Wui ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.1
A short-term survey was carried out to understand the species composition and standing biomass of phytoplankton in Lake Chuam, where severe the eutrophication have took place on summer, 1992. Totally 130 taxa of phytoplankton were collected and consisted of 6 classes, 10 orders, 7 suborders, 23 families, 55genera, 116 species, 13 varieties and 1 forma. Phytoplankton compositions in each class were divided in 57 taxa of Chlorophyceae (43.8%), 44 taxa of Bacillariophyceae (33.9%), 20 taxa of Cyanophyceae (15.4%), 6 taxa of Euglenophyceae (4.6%), 2 taxa of Dinophyceae and 1 taxa of Chrysophyceae. The composition of species and standing biomass was reached to maximum, 72.31% and 42.67% at Site 3, respectively. Dominant species were Microcystis aeruginosa (51.65%), Melosira granulata (4.96%). The next major phytoplankton except these two species were ceratium hirundinella, Eudorina elegans, Anabaena flos-aquae, Dictyosphaerium pulchellum, Coelastrum microporum, Coelasphaerium kuetzingianum, and staurastrum paradoxum var. longipes. These groups were 73.1% of total biomass. And also, species diversity was high at Site 3 throughout the sampling times. Coelastrum-Coelasphaerium-Eudorina-Staurastrum assemblages were much distributed in centering of Site 3, the upper part of lake, inflowed sufficient nutrient from many tributaries. Especially, the high frequency (2.7% of totals) of Staurastrum paradoxum var. longipes was very interesting and new to Korea. In physicochemical factors, suspended solids, electric conductivity and chlorophyll a were reached the maximum, 34.5mg/l, 103μhmos/Cm, 6.7mg/m^3 only at Site 3 in June, closely associated with green algal assemblages. But other data were not showed any relationship between biological and physical conditions of phytoplankton community. The above mentioned results indicate that Lake Chuam has a wide range from eutrophic to oligotrophic state according to Hutchinson(1967), and divided into two regions, Site 1,2 and Site 3 in a view of phytoplankton distribution and biomass and its environmental condition. We conclude that Site 3 was in situation of considerable organic pollution.
분변계 스테롤을 이용한 남해안 패류양식어장(여자만과 강진만)의 퇴적물내 분변오염도 평가
최민규 ( Min Kyu Choi ),이인석 ( In Seok Lee ),황동운 ( Dong Woon Hwang ),김형철 ( Hyung Chul Kim ),김예정 ( Ye Jung Kim ),김숙양 ( Sook Yang Kim ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.4
Eight fecal sterols were analyzed in surface sediments collected from shellfish farming areas in Yeoja Bay and Gangjin Bay, Korea, to evaluate sewage-derived fecal pollution. The concentrations of coprostanol, a good marker of sewage-derived organic contamination, in sediments were in the range of 10-530 ng/g-dry in Yeoja Bay, and 10-190 ng/g-dry in Gangjin Bay. Coprostanol levels were markedly higher in the inner bay than in the outer bay. These levels were lower than those reported in urbanized bays in Korea, however, they were comparable to levels in other shellfish farming areas including Gamak Bay. A multivariate analysis of the ratios of other sterols suggested that the sterols originated from sewage and plankton/benthos. Sewage was the dominant source at stations located close to the river mouth and wastewater treatment plant (WWTP) outfalls, and plankton/benthos was the primary source in the outer bay. These results suggest that management of point sources, e.g., WWTP as well as non-point sources, e.g., riverine inputs is important for improving the water quality in Yeoja Bay and Gangjin Bay.
최민규(Min-Kyu Choi),천만영(Man-Young Chun) 환경독성보건학회 2007 환경독성보건학회지 Vol.22 No.4
This paper was studied to investigate the equilibrium state between organochlorine pesticides (OCPs) concentration of air and soil, and to know whether soil is a secondary pollution source of OCPs in air or not. The OCPs concentration of air (C<SUB>air</SUB>) and soil (C<SUB>soil</SUB>) is not related to molecular weight, vapor pressure (P<SUB>L.</SUB>) and octanol-air partition coefficient (K<SUB>oa</SUB>). The slope of the regression line between soil-air partition coefficient (K<SUB>sa</SUB>) and scavenging coefficient (C<SUB>soil</SUB>/C<SUB>air</SUB>) was 0.2952, which the OCPs concentration between air and soil did not reached to the equilibrium state. The soil/air fugacity quotients (f<SUB>soil</SUB>/f<SUB>air</SUB>) of p.p'-DDT/DDD/DDE and β-HCH (0.30~0.67), which is smaller than I, means the deposit of OCPs from air to soil. However, f<SUB>soil</SUB>/f<SUB>air</SUB> of heptachlor, heptachlor epoxide, α/γ-chlordane, trans-nonachlor, endosulfan sulfate and α/γ-HCH (1.90~73.25), which is greater than I, means that soil is secondary pollution source of OCPs in air.
온천 배수 유입에 따른 소형 하천의 생태계 변화와 회복에 관한 연구 - 소형 하천에서 온천 배수가 부착조류 군집에 미치는 영향
최민규(Min Kyu Choi),정연태(Yeun Tai Chung),길봉섭(Bong Seop Kil),김미연(Mi Youn Kim),문연자(Yeun Ja Mun) 한국환경생물학회 1999 환경생물 : 환경생물학회지 Vol.17 No.3
To study the influences of thermal effluents flowing from hot spring on epilithic algal community, seasonal survey was carried out at stream and its watersheds from Seokjeong hot spring in Chollabuk-Do, Korea. Totally 7 points were divided into three regions for sampling of water and epilithic algae, such as the direct effected, uneffected and the mixed region, respectively. At the discharging points of effluents, a dark-green cyanobacterial mat were remarkably constructed, mainly by two cyanobacteria, Oscillatoria and Phormidium. The mat formation were more obvious at low temperature than any other season, and even result in disappear with downstream and season. Totally, one hundred and fifty-three taxa of epilithic algae were classified with 15 unidentified species. Among the, diatoms occupied 58% of total species, whereas cyanobacteria was 67% of total biomass, comparatively. In terms of stream direction, relative abundance of cyanobacteria was only limited in the upstream in cold season, and result in this pattern disappeared with season change. Although all physicochemical variables at the discharging points, was very high, compare to other points, they were quickly decreased downstream. Among them, some heavy metals were not detected or below the detection levels at downstream. Nitrate nitrogen increased with downstream, as well as phosphorus and sulfate have a similar trend throughout, while ammonia quickly decreased in the initial period of discharging effluents. This suggest that although the thermal effluent with high temperature and organic compounds could polluted the small study stream, various contributions such as flowing water, intake of uneffected streawater and collaboration of cyanobacterial mat and steam bottom gradually induces a stable water system. [Thermal effluents, Epilithic algal community, Chemicals, Correlation].
최민규(Min-kyu Choi),이윤식(Yoon-sik Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper presents the regression analysis modeling method for painting flow rate prediction, which is applicable to automatic painting. After investigating the structural components and the operating principle of the painting system, the static modeling is undertaken through experiments of the pneumatic pressure and hydraulic pressure of pump, density and viscosity of paint, diameter of spray nozzle and painting flow rate. In this modeling, each of fluid models for the pump, hose, spray nozzle and viscous paint is derived by using a regression analysis which is based on the fluid mechanics. The governing equation of painting flow rate is established by integrating these fluid models. Subsequently, the painting flow rate is evaluated from both the proposed modeling and the experiments.
모듈라 셀 구조 기반 펄스 모듈레이터의 서브모듈 시험회로 구축
최민규(Min-Kyu Choi),정송찬(Song-Chan Jeong),송승호(Seung-Ho Song),류홍제(Hong-Je Ryoo) 전력전자학회 2021 전력전자학술대회 논문집 Vol.2021 No.11
본 논문은 모듈라 셀 구조 기반 펄스 모듈레이터의 서브모듈 시험회로 구축에 대해 다룬다. 시험회로는 서브모듈의 펄스 출력 상승시간과 같은 출력특성 확인 및 신뢰성의 검증을 위해 충전전압, 펄스 폭, 반복률의 자유로운 가변이 가능하도록 설계되었다. 시험회로는 LCC 공진형 컨터버 기반의 충전기와 서브모듈로 구성된다. 최종적으로 시험회로는 400W(1kV, 0.4A) 사양으로 구현되었으며 다양한 출력조건에서 시험 가능함을 검증하였다.