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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>
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.
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>
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.
기상자료 처리 자동화를 위한 RESTful 웹서비스 개발
김태곤 ( Taegon Kim ),이성용 ( Sung Yong Lee ),은상규 ( Sangkyu Eun ),이지민 ( Jimin Lee ),서교 ( Kyo Suh ),이정재 ( Jeong Jae Lee ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
기상자료는 수문 모델의 기초적인 입력자료로 널리 이용되고 있으며, 주로 기상청 지상관측자료 (http://www.kma. go.kr)와 국가 수자원관리종합정보시스템(http : //www.wamis.go.kr/)을 통하여 구득된다. 연구자는 웹을 통하여 지역과 시간, 관측요소를 선택하여 자료를 열람할 수 있으나, 수 년에 걸친 시계열자료가 필요하거나, 다양한 지역, 여러 관측요소를 수집하기 위해서는 자료 정리과정이 요구된다. 제한된 양식으로 정보를 표시하는 서비스 제공자 중심의 웹서비스 행태에 기인한 문제로, Tim O'Reilly가 Web as Platform이라는 개념으로 웹 2.0를 소개한 이래, 구글, 야후, 다음, 네이버와 같은 인터넷 정보제공자를 중심으로 Open API를 이용하여 사용자가 원하는 정보를 제공할 수 있도록 변화하였다. RESTful 기반 웹 서비스는 URI를 이용하여 정보를 요청하고 HTTP를 통해 구현되므로, SOAP 기반 웹 서비스에 비하여 단순하고, 가볍다는 장점이 있다. 본 연구에서는 기상자료를 사용자가 손쉽게 이용할 수 있도록 RESTful 기반의 웹서비스를 개발하고, Open API를 제공하였다. 개발된 웹 서비스는 웹 브라우저는 물론 다양한 프로그래밍 언어에서 이용가능하며, 정보 조회가 용이하기 때문에 모바일 앱 개발에 유용하다.
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.