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정지용,최윤석,김지만 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Considerable researches have been devoted to the study of lithium ion batteries (LiBs) in the past decades due to their high theoretical capacity and other properties, which like high charge retention, high volumetric and gravimetric specific energy, to be a high-performance LiB option. Metal silicides have advantageous features compared to other siliconbased anode materials, which are maintaining nano-structure during electrochemical reaction because of their high stability. In this study, we treated metal silicides under various temperatures and atmospheres. We characterized all samples by XRD, N<sub>2</sub> adsorption & desorption, scanning electron microscope and electrochemical tests. Among them, molybdenum silicide (MoSi<sub>2</sub>) shows a remarkable transition. There were substantial structural and chemical transition throughout the calcination in air. And these transitions provoked compelling electrochemical improvements in reversible capacity and cycle retention.
Phase changed molybdenum silicide by simple thermal treatment as anode for lithium ion batteries
정지용,최윤석,( Wang Qian ),김지만 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Considerable researches have been devoted to the study of lithium ion batteries (LiBs) in the past decades due to their high theoretical capacity and other properties, which like high charge retention, high volumetric and gravimetric specific energy, to be a high-performance LiB option. Metal silicides have advantageous features compared to other siliconbased anode materials, which can maintain the nano structure because of their higher stability. In this study, we treated metal silicides under various temperatures and atmospheres. We characterized all samples by XRD, N2 adsorption & desorption, scanning electron microscope and electrochemical tests. Among them, molybdenum silicide (MoSi2) shows a remarkable transition. There were substantial structural and chemical transition throughout the calcination in air. And these transitions provoked compelling electrochemical improvements in reversible capacity and cycle retention.
정지용,김진만 한국건축시공학회 2011 한국건축시공학회지 Vol.11 No.6
The surfactants facilitate the formation of foam bubbles under a proper condition and provide stability of foam bubbles by decreasing the surface tension of solutions and increasing the viscosity of foam surface. However, there have been almost no practical data of foam concrete in this regard so far. This study aims to understand the effects of foaming agents such as anionic synthetic surfactant and anionic natural material surfactant on the low density foamed concrete. From the experiment, the vegetable soap of anionic natural material surfactants showed a higher foaming rate, more open pores, slightly lower compressive strength, and a higher permeability coefficient compared to the vegetable soap of anionic synthetic surfactants. It is believed that the natural material surfactants make not only the surface tension of the solution low but also the viscosity of slurry high.
정지용,최윤석,이지혜,김지만 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Considerable researches have been devoted to the study of lithium ion batteries (LiBs) in the past decades due to their high theoretical capacity and other properties, which like high charge retention, high volumetric and gravimetric specific energy, to be a high-performance LiB option. Metal silicides have advantageous features compared to other silicon-based anode materials, which are maintaining nano-structure during electrochemical reaction because of their high stability. In this study, we treated metal silicides under various temperatures and atmospheres. We characterized all samples by XRD, N2 adsorption & desorption, scanning electron microscope and electrochemical tests. Among them, molybdenum silicide (MoSi2) shows a remarkable transition. There were substantial structural and chemical transition throughout the calcination in air. And these transitions provoked compelling electrochemical improvements in reversible capacity and cycle retention.
공간적 상관구조를 포함하는 선형회귀모형을 이용한 강수량 자료 분석
정지용,진서훈,박만식,Jung, Ji-Young,Jin, Seo-Hoon,Park, Man-Sik 한국통계학회 2008 응용통계연구 Vol.21 No.6
매년 전 세계는 여러 자연재해로 인하여 많은 피해를 받고 있다 그 중에서도 강수와 관련한 집중호우와 가뭄, 홍수, 상수원 부족 등으로 많은 손실을 입고 있다. 이러한 재해에 의한 피해를 줄이기 위해서는 기상에 대한 정확한 예측이 필요하다. 따라서 강수량에 대한 정확한 예측을 실시하여 수자원을 적절하게 이용하고 재해에 의한 피해를 줄이기 위하여 많은 연구가 진행되고 있다. 본 연구에서는 강수량을 측정하는 지상기상관측지점자료에 대해 공간적 상관구조를 포함하는 선형회귀모형(크리깅)을 고려하여 세미베리오그램을 기반으로한 최소제곱법과 코베리오그램을 기반으로한 최대우도추정방법으로 남한지역의 공간적 특성을 적절하게 파악할 수 있는 모형들을 찾고 이 모형들을 비교하였다. 공간적 선형회귀모형들에 대한 신뢰성을 검증하기 위하여 자동기상관측지점과 항공기상관측지점에서 측정된 실제값과 예측값을 비교하고 이를 바탕으로 강수량 예측에 관한 발전 및 개선방향에 대해 알아보았다. In this study, we considered linear regression model with various spatial dependency structures in order to make more reliable prediction of precipitation in South Korea. The prediction approaches are based on semi-variogram models fitted by least-squares estimation method and restricted maximum likelihood estimation method. We validated some candidate models from the two different estimation methods in terms of cross-validation and comparison between predicted values and observed values measured at different locations.