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Kim, Keesung,Gu, Man-Bock,Kang, Do-Hyun,Park, Jee-Won,Song, In-Hong,Jung, Ho-Sup,Suh, Kahp-Yang WILEY-VCH Verlag 2010 Electrophoresis Vol.31 No.18
<P>We present an aptamer-based biosensor (aptasensor) for rapid and high-sensitive detection of oxytetracycline (OTC) antibiotic in PBS inside a Y-channel PDMS microfluidic device. The detection was made by real-time monitoring of the agglutination assay of ssDNA aptamer-conjugated polystyrene latex microspheres with proximity optical fibers. The agglutination assay was performed with serially diluted OTC antibiotic solutions using highly carboxylated polystyrene particles of 920 nm diameter conjugated with OTC-binding ssDNA aptamer. Proximity optical fibers were used to measure the increase in 45° forward light scattering of the aggregated particles by fixing them around the viewing cell of the device with stable angle and distance to the detector. The detection limit was around 100 ppb for the current aptasensor system with the detection time less than 3 min.</P>
Kim, Keesung,Jung, Ho-Sup,Song, Jae-Young,Lee, Man-Ryul,Kim, Kye-Seong,Suh, Kahp-Yang WILEY-VCH Verlag 2009 Electrophoresis Vol.30 No.18
<P>We present real-time, rapid detection of Mycoplasma pneumonia in PBS inside a Y-channel PDMS microfluidic device via optical fiber monitoring of latex immunoagglutination. The latex immunoagglutination assay was performed with serially diluted M. pneumonia solutions using highly carboxylated polystyrene particles of 390 and 500 nm diameter conjugated with monoclonal anti-M. pneumonia. Proximity optical fibers were located around the viewing cell of the device, which were used to measure the increase in 45° forward light scattering of the aggregated particles. The detection limit are slightly less than 50 pg mL<SUP>−1</SUP> both for 390 and 500 nm microspheres and the detection time do not exceed 90 s.</P>
김기성(Keesung Kim),나누리(Nuri Na) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1
이 연구는 기존의 PC 혹은 모바일의 스크린 기반 디자인 프로세스와는 달리 스크린이 존재하지 않거나 최소한으로 존재하는 대화 기반 텍스트 인터페이스 디자인 프로세스를 제안한다. 기존의 서비스 디자인 프로세스들을 ‘논리적 모델(Rational Model)’과 ‘액션중심 모델(Action Centric Model)’의 두 가지 방향으로 나누어 분석하고, 각 프로세스에서 대화형 인터페이스의 특성에 대한 고려가 필요한 단계를 적합한 방법으로 재구성하였다. 기존 디자인 프로세스의 주요 단계들 중 사용자 모델링 단계에서는 가상의 사용자인 퍼소나와 상대방에 해당하는 가상의 봇 퍼소나를 디자인하는 ‘연결된 퍼소나(Two-sides Persona)’ 방법을, 스케치 단계에서는 스크린 내 UI 를 그려보는 와이어프레임 스케치 대신 ‘대화 스케치(Verbal Sketch)’ 방법을, 그리고 플로우차트 디자인 단계에서는 대화의 기본적인 패턴이 적용되어진 ‘짝지어진 플로우차트(Paired Flowchart)’ 방법을 새롭게 디자인 해보았으며 언급된 세 가지 방법이 적용된 텍스트 중심 대화형 인터페이스 디자인 프로세스를 제안한다.
Daehwan Kim,Hwansung Jo,Jingu Lee,Keesung Kim,Sangho Roh KOREAN ACADAMY OF ORAL BIOLOGY 2013 International Journal of Oral Biology Vol.38 No.4
Human dental pulp stem cells (DPSCs) are multi-potent mesenchymal stem cells that have several differentiation potentials. An understanding of thetissues that differentiate from these cells can provide insights for future regenerative therapeutics and tissue engineering strategies. The mesiodens is the most frequent form of supernumerary tooth from which DPSCs can differentiate into several lineages similar to cells from normal deciduous teeth. Recently, it has been shown that nanoscale structures can affect stem cell differentiation. In our presentstudy, we investigated the effects of a 250-nm nanoscale ridge/groove pattern array on the osteogenic and adipogenic differentiation of dental pulp cells from mesiodenscontaining human DPSCs. To this end, the expression of lineage specific markers after differentiation induction was analyzed by lineage specific staining and RT-PCR. The nanoscale pattern arrayed surface showed apositive effect on the adipogenic differentiation of DPSCs. There was no difference between nanoscale pattern arrayed surface and conventional surface groups onosteogenic differentiation. In conclusion, the nanoscale ridge/groove pattern arrayed surface can be used to enhance the adipogenic differentiation of DPSCs derived from mesiodens. This finding provides an improved understanding of the effects of topography on cell differentiation as well as the potential use of supernumerary tooth in regenerative dental medicine.
광합성효율 모델을 이용한 밀폐형 식물 생산시스템의 재배환경 최적화
김기성(Keesung Kim),김문기(Moon Ki Kim),남상운(Sang Woon Nam) (사)한국생물환경조절학회 2004 생물환경조절학회지 Vol.13 No.4
본 연구에서는 폐쇄형 식물 생산시스템 내에서 생체정보에 의한 최적 환경제어와 식물의 환경스트레스 판단을 위하여 엽록소형광 분석법으로 광합성효율 모델을 만들었으며, 광합성효율 모델에 유전알고리즘을 적용하여 재배환경 최적화 프로그램의 응용성을 평가 하였다. 6가지 미기상 요인 중 5가지는 고정하고 1가지씩만 변화시켜 가며 측정한 Fv'/Fm'이 최대가 되는 환경조건은 기온 21℃, CO₂농도 1,200~14,00 ppm, 상대습도 68%, 기류속도 1.4 mㆍs¹, 배양액온도 20℃이었으며 PPF가 140 μ㏖ㆍm²ㆍs¹ 보다 증가할수록 광합성 효율은 감소하였다. 광합성효율모델의 오차는 평균 2.5%였다. 재배환경 최적화 프로그램으로부터 계산된 밀폐형 식물 생산시스템내에서 상추의 최적재배환경조건은 기온 22℃, 배양액온도 19℃, CO₂농도 1,400 ppm, 기류속도 1.0 mㆍs¹, PPF 430 μ㏖ㆍm²ㆍs¹, 상대습도 65%이다. 이상의 연구 결과로부터 광합성 효율 모델을 이용하여 식물 생산시설의 환경모니터링 시스템과 식물 생체정보에 의한 최적제어시스템의 개발이 가능함을 확인하였다. This study was aimed to assess the effects of microclimate factors on lettuce chlorophyll fluorescent responses and to develop an environment control system for plant growth by adopting a simple genetic algorithm. The photosynthetic responses measurements were repeated by changing one factor among six climatic factors at a time. The maximum Fv’/Fm’ resulted when the ambient temperature was 21℃, CO₂ concentration range of 1,200 to 1,400 ppm, relative humidity of 68%, air current speed of 1.4 mㆍs¹, and the temperature of nutrient solution of 20℃, In PPF greater than 140 μ㏖ㆍm²ㆍs¹, Fv’/Fm’ values were decreased. To estimate the effects of combined microclimate factors on plant growth, a photosynthesis efficiency model was developed using principle component analysis for six microclimate factors. Predicted Fv’/Fm’ values showed a good agreement to measured ones with an average error of 2.5%. In this study, a simple genetic algorthim was applied to the photosynthesis efficiency model for optimal environmental condition for lettuce growth. Air emperature of 22℃, root zone temperature of 19℃, CO₂ concentration of 1,400 ppm, air current speed of 1.0 mㆍs¹, PPF of 430 μ㏖ㆍm²ㆍs¹, and relative humidity of 65% were obtained. It is feasible to control plant environment optimally in response to microclimate changes by using photosynthesis efficiency model combined with genetic algorithm.
Prediction of the Salinization in Reclaimed Land by Soil and Groundwater Characteristics
( Jihun Jeon ),( Donggeun Kim ),( Taejin Kim ),( Keesung Kim ),( Hosup Jung ),( Younghwan Son ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.6
It is becoming more important to utilize reclaimed lands in South Korea, due to the increasing competition for its usage among different sectors. However, the high groundwater level and poor permeability are exposing them to deterioration by salinization. Salinization is difficult to predict because the pattern changes according to various characteristics of soil and groundwater. In this study, the capillary rising time was studied by the water content profile in the soil. The prediction equation of soil salinity was developed based on simulation result of the CHEMFLO model. to enable prediction considering various soil water content and groundwater level. The two terms constituting the equation showed the coefficients of determination of 0.9816 and 0.9824, respectively. Using the prediction equation of the study, the surface salinity can be easily predicted from the initial surface salinity and the salinity of the groundwater. In the future, more precise predictions will be possible with the results of studies on the hydraulic characteristics of various reclaimed soils, changes in water content profile by seasonal and climate events.
레진의 경화 반응을 고려한 UV-NIL 공정의 열특성에 관한 실험 및 수치해석 연구
김우송(Woo-song Kim),박경서(Gyeong-seo Park),남진현(Jinhyun Nam),임홍재(Hongjae Yim),장시열(Siyeol Jang),이기성(Keesung Lee),정재일(Jay Jeong),임시형(Sihyeong Lim),신동훈(Donghoon Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The process conditions during ultraviolet nanoimprint lithography (UV-NIL) process such as temperature, stamping pressure, UV irradiation, etc. are effective factors for successful imprinting of complex and fine patterns. In this study, the effects of aluminum mold on the thermal characteristics of UV-NIL process were investigated through imprinting experiments and numerical simulations. The temperature of polymer resin on mold was measured to study thermal characteristics during UV curing. From the experimental and numerical results, the importance of curing reaction control for UV-NIL process was discussed for deformation characteristics.