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Kim, Jinbum,Shin, Ilgyou,Park, Taejin,Kim, Jinyong,Choi, Seongheum,Lee, Sungho,Hong, Seongpyo,Lee, Hyung-Ik,Won, Jung Yeon,Kim, Taegon,Kim, Yihwan,Hwang, Kihyun,Lee, Hoo-Jeong,Kim, Hyoungsub Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.788 No.-
<P><B>Abstract</B></P> <P>Pulsed-laser annealing (PLA) was performed on a preformed Pt-doped Ni-rich silicide film (Ni<SUB>2</SUB>Si phase), and its microstructural and phase evolution were studied from submelting to melting condition by varying the laser power density (<I>P</I>). Vertically nonuniform compositional profile with an interfacial intermixing was observed under a solid state reaction regime (<I>P</I> < 400 mJ/cm<SUP>2</SUP>) due to a limited atomic diffusion. At higher <I>P</I> condition, melting/resolidification occurred with a continuous increase in the Si concentration, and various microstructures of the film evolved with increasing <I>P</I>: amorphous structure and nucleation/growth of NiSi and NiSi<SUB>2</SUB> phases form in that order on the Si interface. Lastly, by applying additional rapid thermal annealing on the polycrystalline mixture of NiSi and NiSi<SUB>2</SUB> phases formed by PLA, a uniform Pt-doped NiSi<SUB>2</SUB> film with strong epitaxial growth tendency on the Si(001) substrate and high thermal stability (up to 900 °C) was synthesized.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pt-doped Ni-silicides are formed using pulsed-laser annealing at various powers. </LI> <LI> Power-dependent solid- and liquid-state reactions yield various microstructures. </LI> <LI> Power-dependent microstructural and phase evolution paths are suggested. </LI> <LI> Additional rapid thermal annealing forms a thermally stable NiSi<SUB>2</SUB> film. </LI> </UL> </P>
Kim, Taegon,Moon, Dongseok,Park, Jin Hyuk,Yang, Heehong,Cho, Seongyeon,Park, Tai Hyun,Ahn, Dong June The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.16
<P>A new polydiacetylene lipid/human olfactory receptor nano-assembly was fabricated for the visual detection of an odorant for the first time. The assembly consisted of phospholipid-mixed polydiacetylenes (PDAs) and human olfactory receptors (hORs) in detergent micelles. To overcome the limitations of bioelectronic noses, hOR-embedded chromatic complexes (PDA/hORs) were developed, introducing PDAs that showed color and fluorescence transitions against various stimuli. The chromatic nanocomplexes reacted with target molecules, showing a fluorescence intensity increase in a dose-dependent manner and target selectivity among various odorants. As a result, a color transition of the assembly from blue to purple occurred, allowing the visual detection of the odorant geraniol. Through circular dichroism (CD) spectroscopy and a tryptophan fluorescence quenching method, the structural and functional properties of the hORs embedded in the complexes were confirmed. Based on this first work, future array devices, integrating multiple nano-assemblies, can be substantiated and utilized in environmental assessment and analysis of food quality.</P>
Postsynaptic Stability and Variability Described by a Stochastic Model of Endosomal Trafficking
Kim, Taegon,Tanaka-Yamamoto, Keiko Frontiers Media S.A. 2019 Frontiers in cellular neuroscience Vol.13 No.-
<P>Neurons undergo dynamic processes of constitutive AMPA-type glutamate receptor (AMPAR) trafficking, such as the insertion and internalization of AMPARs by exocytosis and endocytosis, while stably maintaining synaptic efficacy. Studies using advanced imaging techniques have suggested that the frequency of these constitutive trafficking processes, as well as the number of AMPARs that are involved in a particular event highly fluctuate. In addition, mechanisms that trigger some forms of synaptic plasticity have been shown to include not only these processes but also additional fluctuating processes, such as the sorting of AMPARs to late endosomes (LEs). Thus, the regulation of postsynaptic AMPARs by the endosomal trafficking system appears to have superficially conflicting properties between the stability or organized control of plasticity and highly fluctuating or stochastic processes. However, it is not clear how the endosomal trafficking system reconciles and utilizes such conflicting properties. Although deterministic models have been effective to describe the stable maintenance of synaptic AMPAR numbers by constitutive recycling, as well as the involvement of endosomal trafficking in synaptic plasticity, they do not take stochasticity into account. In this study, we introduced the stochasticity into the model of each crucial machinery of the endosomal trafficking system. The specific questions we solved by our improved model are whether stability is accomplished even with a combination of fluctuating processes, and how overall variability occurs while controlling long-term synaptic depression (LTD). Our new stochastic model indeed demonstrated the stable regulation of postsynaptic AMPAR numbers at the basal state and during LTD maintenance, despite fast fluctuations in AMPAR numbers as well as high variability in the time course and amounts of LTD. In addition, our analysis suggested that the high variability arising from this stochasticity is beneficial for reproducing the relatively constant timing of LE sorting for LTD. We therefore propose that the coexistence of stability and stochasticity in the endosomal trafficking system is suitable for stable synaptic transmission and the reliable induction of synaptic plasticity, with variable properties that have been observed experimentally.</P>
Short-Term Residential Load Forecasting Using 2-Step SARIMAX
Kim Taegon,Jang Minseok,Jeong Hyun Cheol,Joo Sung-Kwan 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.2
In contrast to city-level and larger aggregate-level load forecasting, load forecasting for residential customers is a much more challenging problem because residential loads are much more volatile. In order to forecast the residential load at one-hour interval 24-h loads the day before, a 2-Step SARIMAX method for residential load forecasting is proposed in this study. The forecasting performance of the proposed method is compared with the existing forecasting methods including SARIMA.
바이오매스 자원화를 위한 선형계획법 기반의 최적 자원수급 지역 결정 및 시각화
김태곤 ( Taegon Kim ),김솔희 ( Solhee Kim ),서교 ( Kyo Suh ) 한국농공학회 2014 한국농공학회 학술대회초록집 Vol.2014 No.-
온실가스 저감 및 친환경 에너지 확보를 위하여 바이오매스를 활용한 자원화에 관한 연구가 활발히 이루어지고 있다. 바이오매스는 넓은 지역에 분포하고 있기 때문에, 효율적인 자원화를 위해서는 자원 수급을 원활히 수행할 수 있는 집합지의 위치가 중요하다. 바이오매스의 종류에 따라 단위면적당 산출량이나 집합지 혹은 처리시설의 용량이 다르므로, 이를 반영한 방법론이 요구되고 있다. 본 연구에서는 선형계획법을 이용하여, 시군단위 생산량 및 집합지의 위치, 용량을 입력 자료로 받아들여, 각 집합지의 최적 수급지역을 결정하고 시각화하는 모델을 개발하였다. 개발한 모델은 최적지를 결정하고, 결정된 최적지를 웹 환경을 통하여 지도로 도시함으로써 시각적으로 결과를 확인할 수 있도록 구현하였다. 모델의 적용을 위하여 바이오에탄올을 생산하기 위한 볏짚 수급 지역을 평가하였다. 바이오에탄올 공장의 위치는 석유화학단지로 가정하여 모의하였다.
김태곤 ( Kim Taegon ),이정재 ( Lee Jeong-jae ) 한국농공학회 2009 한국농공학회논문집 Vol.51 No.2
Many researcher uses simulation techniques for understanding the phenomenon and expecting the response. Simulation techniques have many advantages which is less time-consuming, easy to control constraints, and cheaper than experimental study. However Researches usually are not good at programming the model, it's hard to implement simulation model using computer language. They use spreadsheet program like Microsoft excel<sup>TM</sup> Although a spreadsheet program is good for modeling, it's cumbersome to describe expressions which consist of not variable name but location indicator. This study suggests the program which helps researcher developing model using graphical interface and variable name. For verifying usability, the model which is implemented by developed modeler were compared with by spreadsheet program.
농촌지역 초·중등 교육시설에 대한 마을단위 접근성 평가
김솔희 ( Kim Solhee ),김태곤 ( Kim Taegon ),서교 ( Suh Kyo ) 한국농촌계획학회 2017 농촌계획 Vol.23 No.3
Although the educational facility are an important considerations on a social equity standpoint, educational environment in rural areas has been continuously deteriorated by numerous social problems such as decreasing birth rate and increasing of local school closing. The purpose of this study is to evaluate the accessibility of educational environment in rural areas on village level. First, we evaluate physical accessibility based on legally defined commuting distance. Second, the implication of village population of potential accessibility is analyzed. Lastly, the facility centrality index of each village is estimated for assessing the relations of educational accessibility. The main results of this study are as follows; (1) The accessibility of most villages in Pyeongchang-gun is vulnerable that 81.10% for elementary school, 73.17% for middle school, and 82.32% for high school, respectively; (2) The average commuting distance per student considering estimated number of students for each educational facilities indicated 2.75km for elementary school, 4.37km for middle school, and 5.79km for high school; (3) the facility centrality index is highly correlated to educational facilities but not to village population.
효율적인 수자원 관리를 위한 수리시설 검측장비용 점검항목 설계
김태곤 ( Taegon Kim ),남원호 ( Wonho Nam ),최진용 ( Jin-yong Choi ),김진택 ( Jin-taek Kim ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
농업용 수리시설물은 소규모이면서 개소수가 많기 때문에 효율적으로 관리하기가 어려우며, 현재 운영 및 시설 현황 파악조차 쉽지 않다. 농어촌공사에서 관리하고 있는 수리시설물은 수리시설감시원이 종이 조사표에 수기를 하여 시설상태를 점검하고 있어 자료의 누락 및 오류, 전산화를 위한 재입력 과정 등의 어려움을 가지고 있다. 이에 시설 점검의 편의성 및 효율성을 제고하기 위해 휴대용 검측장비를 개발하기 위한 연구가 수행 중이며, 본 연구에서는 검측장비 개발에 있어서 필요한 점검항목을 설계하고자 하였다. 현장에서 사용하고 있는 야장 및 수자원 관리지침 등 문헌조사를 바탕으로 수리시설별, 점검시기별로 점검항목을 제시하였다.