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Zhang T.,Du W.Y.,Zhan C.Y.,Wang M.M.,Deng H.W.,Xie Z.M.,Li H. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
The synergistic effect of ZrC nanoparticle pining and Re solution in W matrix on the thermal stability of tungsten was studied by investigating the evolution of the microstructure, hardness and tensile properties after annealing in a temperature range of 1000e1700 C. The results of metallography, electron backscatter diffraction pattern and Vickers micro-hardness indicate that the rolled W-1wt%Re-0.5 wt% ZrC alloy has a higher recrystallization temperature (1600 Ce1700 C) than that of the rolled pure W (1200 C), W-0.5 wt%ZrC (1300 C), W-0.5 wt%HfC (1400e1500 C) and WeK-3wt%Re alloy fabricated by the same technology. The molecular dynamics simulation results indicated that solution Re atoms in W matrix can slow down the self-diffusion of W atoms and form dragging effect to delay the growth of W grain, moreover, the diffusion coefficient decrease with increasing Re content. In addition, the ZrC nanoparticles can pin the grain boundaries and dislocations effectively, preventing the recrystallization. Therefore, synergistic effect of solid solution Re element and dispersed ZrC nanoparticles significantly increase recrystallization temperature
M. Q. Zeng,J. L. Tu,M. Zhu,W. Wang,J. W. Liu,Z. C. Lu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.9
The effects of plasma discharge intensity on the microstructure evolution of ball-milled tungsten (W)–carbon (C)–cobalt (Co)mixtures and the formation mechanism of ultrathin plate-like tungsten carbide (WC) grains prepared by ball milling with andwithout plasma discharge were investigated. It was found that increasing the plasma discharge intensity during ball millingobviously promoted the formation of a thin flake-like W phase because of the electroplasticity effect and simultaneouslylowered the carburization temperature between W and C. A combination of high hardness and transverse rupture strength of92.9 HRA and 3659 MPa, respectively, was obtained for the WC–8Co alloy fabricated by plasma milling at a gas pressure of5 × 103 Pa with a dielectric barrier discharge layer thickness of 3 mm. These properties were mainly attributed to the markedlylowered activation energy of the WC phase and generation of highly oriented ultrathin plate-like WC grains by plasma milling. The combination of the flake-like structure of the plasma-milled W aggregate and high specific interfacial area and shortdiffusion distance of W/C were readily inherited by the ultrathin plate-like WC grains in the sintered WC–Co hardmetals.
Exploring the Echo Chamber Effect of ASMR Marketing Content on User: A Text-mining Perspective
Wang, M.,Tran, H. C.,Choi, J. W. 한국지능정보시스템학회 2022 한국지능정보시스템학회 학술대회논문집 Vol.2022 No.6
Recently, social media content is growing strongly, among them Autonomous sensory meridian response (ASMR) become one of the most trending contents on YouTube. This study aims to explore the echo chamber effect of ASMR marketing content on online users. First, we applied sentiment analysis and topic modeling to uncover the user’s attitude toward three types of ASMR content such as mukbang, tourism and sponsor content. Then we used social network analysis and multilayer perceptron to explore the difference in communication effect of each ASMR content field. Through the result sentiment analysis and topic modeling, we found online users have better attitudes and responses towards ASMR tourism content than ASMR mukbang and ASMR sponsor content. The results of social network analysis and multilayer perceptron show the ASMR Mukang has the best communication effect among them, next is ASMR sponsor content, and ASMR tourism content has a weaker communication effect than others.
지능형 저작 시스템을 위한 멀티미디어 객체 지향 지식 표현
손완기(W.K. Son),탁진현(J.H. Tak),이세훈(S.H. Lee),왕창종(C.J. Wang) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2A
상호작용 멀티미디어 교수는 주의 집중 효과와 이해력 중진으로 다양한 학습상황에 있어서 학습성취도를 향상시킬 수 있다. 이를 위해서는 지능형 저작 시스템의 영역 지식에 멀티미디어 지식을 쉽게 표현할 수 있는 방법이 제시되어야 한다. 본 연구에서는 교사의 관점과 영역 전문가의 관점을 혼합한 이중적인 지식망에 멀티미디어 지식을 표현하는 방법을 제안하고 이러한 지식을 인공 지능 전문가가 아닌 일반 사용자로 하여금 손쉽게 저작할 수 있도록 지식 습득 도구를 설계한다. 또한, 멀티미디어 지식을 지식망에 자연스럽게 첨가하기 위해서 멀티미디어 메타 언어를 설계하고, 멀티미디어 지식이 갖는 시간 관련성을 쉽게 정의할 수 있도록 동기 관리자를 설계한다.