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강성우,최형권,정완진,유요한,유정열 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11
A finite element code is parallelized by vertex-oriented domain decomposition method which utilizes one- or multi-dimensional partitioning in structured mesh and METIS Library in unstructured mesh. For obtaining the domain-decomposed solution, iterative solvers like conjugate gradient method are used. To accelerate the convergence of iterative solvers, parallel incomplete LU factorization preconditioners are employed, and their performances are compared. For the communication between processors, Message Passing Interface Library is used. The speedups of parallel preconditioned iterative solvers are estimated through computing 2- and 3-dimensional Laplace equations. The effects of mesh and partitioning method on the speedup of parallel preconditioners are also examined.
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강성우,김선 한국학중앙연구원 한국학중앙연구원 2023 Korea Journal Vol.63 No.2
The collective memory of Korea, which has evolved through the shaping of the country’s national culture and identity, has deepened Koreans’ animosity toward Japan, and undermined reconciliation between Korea and Japan since the end of World War II. This paper analyzes how the collective memory of Japanese colonization of Korea has been constructed since World War II by examining the multiple narratives contained in Arirang, a popular Korean novel by Jo Jeong-rae, which has since the 1990s achieved canonical status on the basis of its nationalist perspective. For this purpose, this paper explores how Japanese colonialism is portrayed in Arirang, the pushback this portrayal has received from professional historians, and the socio-economic context in which the collective memory the novel promotes has been shaped and shared among Koreans.
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강성우 현대영어교육학회 2011 현대영어교육 Vol.12 No.2
Dynamic testing is a new way of integrating testing and instruction. It is rooted in Vygotsky’s view that the development of human cognition can be mended with adults’proper mediation. It measures learners’ ability to solve the testing tasks independently and learner’s ability to solve the tasks with the help from adults. The latter ability is a potential ability which will develop as an independent ability in the future. This study aims to introduce dynamic testing into elementary English education and find what benefits can be obtained. Dynamic testing was applied to a 6th grade class of 31students. The results revealed that compared to traditional result-oriented tests, more detailed information on students’ English language development status could be obtained. Since the dynamic testing involved the teacher’s mediation, the testing process could also function as a learning opportunity for some students. That is,learning and assessment could be integrated with dynamic assessment. Lastly, this paper emphasized the need for more study on the English language development of the elementary school students. Such studies were expected to indicate what kind of mediation would be effective in expediting students’ language development.
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강성우,김태희,문주호,김성열,박준영,최선희,김주선,Kang, Sung-Woo,Kim, Tae-Heui,Moon, Joo-Ho,Kim, Sung-Youl,Park, Jun-Young,Choi, Sun-Hee,Kim, Joo-Sun 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.11
High frequency dielectric ceramics have potential for applications in mobile and satellite communications systems at frequencies higher than 10GHz. The Ba$(Zn_{1/3}Ta_{2/3})O_3$ ceramics are known to have a high quality factor, a small temperature coefficient of the resonance frequency and a high dielectric constant. On the other hands, sintering at high temperature for extended time is required to obtain the ordered structure for high quality factor. In this study, the microwave dielectric properties of $ZrO_2$ and NiO-added Ba$(Zn_{1/3}Ta_{2/3})O_3$ ceramics prepared by solid-state reaction have been investigated. Adding $ZrO_2$ and NiO could effectively promote the densification even the case of decreasing the sintering time. At the surface of samples, secondary phase of Ba-Ta compounds was formed possibly due to the evaporation of ZnO, however, the interior of the samples remained as pure Ba$(Zn_{1/3}Ta_{2/3})O_3$. The samples sintered at $1600^{\circ}C$ for 2h exhibited 1:2 ordering of Zn and Ta cations. Excellent microwave dielectric properties of $Q{\cdot}f$(>96,000 GHz) and ${\varepsilon}_r$=30 has been obtained.
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