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김범중,김수아,김형중 한국정보통신설비학회 2018 한국정보통신설비학회 학술대회 Vol.2018 No.08
Since the price fluctuation of most cryptocurrencies is severe, questions of its practical usage have been raised. Regarding this circumstance, several tokens called ‘Stable Coin’ such as Tether(USDT), TrueUSD(TUSD) have been made, which claim that they have stabilized their value. Most of these Stable Coins are in a form of tokens. This means that they do not have their own main net and use other blockchain platforms like Ethereum and Omni. Problematic issues of their dependent platform may bring a collateral damage on the tokens. Thus, a model of a Stable Coin which has its own blockchain platform is needed. In this paper, analysis and the problems of existing Stable Coins will be described. Furthermore, a proposal for a new Stable Coin model and its application will be narrated.
김범중,유경근 한국자원공학회 2021 한국자원공학회지 Vol.58 No.1
Productivity in the mining industry declined in the 2000s due to a slowdown in industrial innovation from the 1980s to the 1990s. Therefore, major mining companies attempted digital transformations to improve their responsiveness to changing environments at industrial sites, develop predictive maintenance systems, and prevent the loss of on-site support resources. This study reviews the automation and predictive maintenance systems that were introduced to the mining industry as major policy changes to promote the introduction of the 4th industrial revolution to the domestic mining industry. 1980년대부터 1990년대까지 산업혁신이 부진하여 2000년대 자원산업의 생산성이 감소하였다. 메이저 광업회사들은 디지털 전환을 시도하여 변화하는 현장에 대한 대응능력을 개선하고, 예측점검 시스템을 마련하며, 현장 지원자원 손실의 방지 등을 실현하고자 하였다. 이 글에서는 메이저광업회사들의 도입한 디지털 전환 주요 정책으로서 광산업에 대한 자동화와 예측 유지보수 시스템의 도입 사례를 검토하여 국내 광산업의 4차산업 도입을 촉진하고자 하였다.
기어 강도 향상을 위한 SCM420H재의 고농도 침탄 열처리에 관한 연구
김범중,최덕기 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.5
Recently, weight lightening is a key issue for various mechanical components to improve the fuel efficiency. For this reason, many researchers have been studying focused on the development of surface hardening treatment and metallic materials with high strength and wear resistance. In this study, we examine the formation of carbide at the surface of the gear machined by SCM420H steel after super- carburizing in order to improve the wear resistance of gear. The experimental results show that super- carburizing heat treatment gives rise to carbide dispersion across wider range of depth and higher carbon concentration than general carburizing heat treatment. Carbide having spheroidal or spherical shape had a size under 2 micro-meter produced in austenite grain boundaries or within austenite grains during super-carburizing. The super- carburized specimen maintained the hardness, HV700 above, at the 0.6mm depth and had a 10.4% lower coefficient of friction which was 0.766. This results from the dispersed carbide which lowered the coefficient of friction and ended up affecting wear resistance. Consequently, we conclude that super-carburizing heat treatment has more influence on the improvement of hardness, wear resistance compared to general carburizing heat treatment.