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RISS 인기검색어
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- 저자 : Geonhee Kim(김건희) (검색결과 6 건)
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김건희 ( Geonhee Kim ),박기성 ( Kisung Park ),이영구 ( Young-koo Lee ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
행위 패턴은 사람의 행위들이 수행되는 양식으로 성향, 습관, 건강상태 등에 따라 다르게 나타나는 생활양식이다. 헬스케어, 마케팅, 정책 결정 등과 같은 다양한 분야에서 사람의 행위패턴을 활용 하고 있다. 행위 패턴을 분석하기 위한 방법으로 행위 패턴들을 비교하는 연구가 진행되고 있다. 기존의 행위 패턴 비교 기법은 구조적 정보만을 반영하여 정확도가 저하되는 문제점이 발생한다. 본 논문에서는 두 행위 그래프를 효과적으로 유사도를 정확하게 비교하기 위하여 구조적 정보와 행위간의 의미적 유사성을 동시에 반영한다. 실험을 통하여 기존의 기법보다 약 4% 정확도가 향상됨을 보인다.
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Physiological and biochemical responses of Ulva pertusa to metal exposure
Geonhee Kim(김건희),Jihae Park(박지혜),Soyeon Choi(최소연),Hojun Lee(이호준),Taejun Han(한태준) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
The green alga Ulva is considered to be a simple, homogeneous algal form with little functional differentiation within the thallus. Functional differentiation of the thallus is a strategy that contributes to the survival of Ulva pertusa as an opportunistic alga. Although many ecotoxicity assessments have been conducted based on spore-forming properties of the marginal thallus parts, ecotoxicity using the middle parts of the thallus has rarely been achieved. Therefore, we investigated the response of the middle and marginal thallus region of Ulva pertusa to exposure of six heavy metals (Cu, Cr, Cd, Ni, As, Ag). Concentration-dependent reduction in disc size, Fv/Fm, ETRmax and pigment were observed with Ag being the most toxic to Ulva pertusa.
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김병창,김대욱,김건희,Kim, Byoung Chang,Kim, DaeWook,Kim, GeonHee 한국광학회 2014 한국광학회지 Vol.25 No.5
일련의 국부영역으로부터 이차미분값을 획득하여 전체 형상을 복원하는 측정법을 제안하였다. 측정시 기울기가 제거된 국부형상에 대해 곡률과 이차미분이 동일시 되는 점을 이용하여, 3개의 이차미분값으로부터 직교하는 2방향을 따라 3차원형상을 복원할 수 있는 알고리즘을 구현하였다. 임의로 발생시킨 Zernike다항식의 계수로 자유곡면형상을 생성시키고, 구현된 알고리즘을 적용함으로써 검증과정을 수행하였다. 적용한 결과 최대 0.8 mm Sag를 갖는 직경 200 mm영역의 자유곡면형상에 대해 RMS 19 nm 형상복원오차를 갖고 복원됨을 확인하였다. 측정오차에 대한 복원오차 민감도를 진단하기 위해 SNR(Signal-to-Noise Ratio) 16의 가우시언 랜덤 노이즈를 부여한 후, 복원되는 형상의 오차를 진단한 결과, 197 nm의 형상복원오차가 발생함을 확인하였다. We present an algorithm for surface reconstruction from the second-derivative data for free-form aspherics, which uses a subaperture scanning system that measures the local surface profile and determines the three second-derivative values at those local sampling points across the free-form surface. The three second-derivative data were integrated to get a map of x- and y-slopes, which went through a second Southwell integration step to reconstruct the surface profile. A synthetic free-form surface 200 mm in diameter was simulated. The simulation results show that the reconstruction error is 19 nm RMS residual difference. Finally, the sensitivity to noise is diagnosed for second-derivative Gaussian random noise with a signal to noise ratio (SNR) of 16, the simulation results proving that the suggested method is robust to noise.
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Ulva bioassay as a tool to assess potential toxicity in industrial wastewater
Hojun Lee(이호준),Kisik Shin(신기식),Jihae Park(박지혜),Soyeon Choi(최소연),Geonhee Kim(김건희),Stephen Depuydt(스테픈 데퓨잇),Taejun Han(한태준) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Industrial wastewater is a complex source of organic and man-made pollutants containing numerous metal ions. These effluents can be a major problem for the environment due to their complex chemical content, which is known for its toxicity and low biodegradability, which can have harmful effects on the aquatic environment. In this study, we used the green macroalga Ulva pertusa to evaluate the toxicity of wastewater samples from 99 industries in South Korea and to characterize the relationship between ecotoxicity and chemical content to identify chemicals that could contribute to overall ecotoxicity. Although the metal content of most of the effluents did not exceed the allowable criteria, the measured ecological toxicity of the effluents is related to Cd, Cu, Ni, Pb and Zn. Specifically in the area of metals, the Ulva bioassay shows a positive and important relationship with Cr. These results highlight the importance of biological assays to continuously monitor the toxicity of treated wastewater to prevent harmful effects on the environment. The results also suggest that ecotoxicity data are needed in parallel with chemical data to better assess the safety of wastewater discharges to the environment.
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Development of photosynthesis biosensor for drinking water quality monitoring
Soyeon Choi(최소연),Jihae Park(박지혜),Hojun Lee(이호준),Geonhee Kim(김건희),Taejun Han(한태준) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
The unprecedented increase in anthropogenic pollution of the aquatic environment has made the development of sensitive, cost-effective and adaptable early warning systems for monitoring chemical pollutants absolutely crucial. Biosensors based on aquatic plants could provide a cost-effective alternative for environmental risk analysis, as they can provide rapid information on toxicity in case of pollution, while assessing the hazardous effects of pollutants on the aquatic ecosystem. In this work, an optical biosensor based on chlorophyll-a fluorescence was developed to monitor aquatic pollutants specifically for drinking water quality. The response of the biosensor was investigated using Spirodela polyrhiza, also known as duckweed, as a test species over a1-h acute exposure to atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine), which is the most widely used herbicide worldwide to control hardwood and grass weeds. The detection concentration was 0.6 mg/L, which was calculated using a specific equation based on the acceptable daily intake (ADI; μg/kg/day) of the WHO drinking water guideline, standard weight (kg) and daily drinking water intake (L/day). Chl-a fluorescence of S. polyrhiza at the detection concentration of 0.6 mg/L decreased by more than 20% compared to the control.
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Toxicity testing of wastewater and inter-laboratory comparison based on Lemna minor root elongation
Jihae Park(박지혜),Eun-Jin Yoo(유은진),Kisik Shin(신기식),Soyeon Choi(최소연),Hojun Lee(이호준),Geonhee Kim(김건희),Stephen Depuydt(스테픈 데퓨잇),Jonas De Sager(요나스 데 세거),Taejun Han(한태준) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
The Lemna minor root regrowth test method is a toxicity test performed with very simple equipment and only one L. minor plant (two- to three-frond) in each culture well, cutting the roots before exposure and measuring the regrowth of the newly developed roots after three days. As a substrate for laboratory toxicity assays, L. minor has the advantages of small size, structural simplicity and rapid growth. Compared to the three internationally standardized methods, this bioassay is faster, simpler, more convenient and cheaper. It can be applied to a variety of sample types, including (a) individual chemicals, commercial products or known mixtures of chemicals, (b) industrial or urban freshwater effluents, elutriates or leachates and (c) surface freshwater or receiving waters. The test can be used alone or as part of a test battery to determine and monitor the toxic effects of individual substances or complex mixtures that may be harmful to aquatic life in freshwater ecosystems, and as a weight-of-evidence approach to determine the need for controlling discharges and setting effluent standards.
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