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최형권,나민구 한국외국어대학교 중국연구소 2014 中國硏究 Vol.60 No.-
By using rhetorical framework, this study tries to analyze a speech which Xijinping delivered in Russia. Because the first country he visited after his inauguration was Russia in 2013, and the speech in Moscow State Institute of International Relations had been delivered at this time, we can conclude that by analyzing this speech, we can at least make a slight evaluation and prediction regarding the methods and directions that China is going to take in international relations and diplomacy First of all, this paper will distinguish the speech by invention-disposition-elocution-delivery. The speech is a political speech that can also be characterized as an epideictic speech. The speaker was in a position where he needed to strengthen the relationships with Russia and for this reason, he mentioned some changes in circumstances around China and Russia and also he emphasized the justification about the importance of cooperation between China and Russia. The speech was divided as an opening, narration, argumentation, and peroration. And for each section, relevant stories were delivered. The speaker tended to repeat the words he considered important in order to communicate his thoughts effectively. Also he used correct grammar and maintained consistent accents and voices that helped the speech to be stable and believable but relatively modest. The gist of the speech that Xijinping tried to deliver was that Russia and China should be kept in close collaboration as allies. On the other hand, he mentioned some of the past histories for the audiences to realize the ways to collaborate, and he recognized himself as a messenger for the collaboration. By setting up a collective value, he tried sail the boat for better futures. It is possible to read in his speech that he tried to keep the balance of the Western and the U.S powers in check and to put China on the top position to lead the world order. Therefore, this study has its meaning finding out the intentions of China`s manipulating reality through analyzing rhetorically the Chinese top leader`s diplomatic texts.
운동이 사회적으로 고립된 쥐의 해마에서 5-HT7 시스템에 미치는 영향
최형권,김현태 한국스포츠학회 2020 한국스포츠학회지 Vol.18 No.3
본 연구의 목적은 사회적 고립(Social Isolation, SI) 스트레스가 해마에서의 세로토닌 발현과 5-HT7 시스템에 미치는 영향을 살펴봄과 동시에 운동이 갖는 개선효과를 검증하고자 실시되었다. 이를 위해 Sprague-Dawley(SD)계 3주령 수컷 쥐(n = 40)를 집단/통제; GCG(n = 10), 집단/운동; GEG(n = 10), 고립/통제; ICG(n = 10), 고립/운동; IEG(n = 10)으로 구분하였다. 6주간의 SI 스트레스를 적용 후 운동집단(ICG, IEG)을 대상으로 6주간 운동프로그램(트 레드밀)을 실시하였으며, 모든 처치가 완료된 후 희생하여 분석하였다. 연구결과 ICG 집단은 해마에서의 serotonin-positive cell 발현과 5-HT7 수준이 유의하게 감소하였다. 또한 5-HT7 시스템의 하위 신호체계에 해당하 는 AC, pERK-1/2가 감소함에 따라 BDNF 발현이 감소하는 것으로 나타났다. 반면 운동을 실시한 IEG 집단은 serotonin-positive cell 발현과 5-HT7 수준이 유의하게 증가하였다. 이에 따라 AC, pERK-1/2 및 BDNF의 발현 또한 유의하게 증가하는 것으로 확인되었다. 결과적으로 운동이 SI 스트레스로 인한 억제된 해마에서의 5-HT7 시스템을 개선하는 방안이 될 수 있을 것으로 보인다. The purpose of this study was to examine the effects of social isolation(SI) stress on serotonin expression in hippocampus and on 5-HT7 systems and to verify the improvement effects of exercise. Forty Sprage-Dawley(SD) male rats were divided into four groups(group/control; GCG, group/exercise; GEG, isolated/control; ICG, isolated /exercise; IEG, each n = 10). After applying the six-week SI stress, a six-week treadmill exercise was conducted on the exercise group(ICG, IEG) and was analyzed at a sacrifice after all treatments were completed. Studies have shown that the ICG has significantly decreased serotonin-positive cell expression and 5-HT7 levels in the hippocampus. It was also shown that BDNF expression decreased as AC, pERK-1/2 corresponding to the sub-signalling system of 5-HT7 systems decreased. On the other hand, IEG that carried out exercise showed significant increases in the level of serotonin-positive cell expression and 5-HT7. The expression of AC, pERK-1/2 and BDNF has also been found to increase significantly. As a result, it seems that exercise could be a way to improve inhibited 5-HT7 system in hippocampus due to SI stress.
이산화된 Navier-Stokes 방정식의 영역분할법을 위한 병렬 예조건화
최형권,유정열,강성우,Choi, Hyoung-Gwon,Yoo, Jung-Yul,Kang, Sung-Woo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.6
A finite element code for the numerical solution of the Navier-Stokes equation is parallelized by vertex-oriented domain decomposition. To accelerate the convergence of iterative solvers like conjugate gradient method, parallel block ILU, iterative block ILU, and distributed ILU methods are tested as parallel preconditioners. The effectiveness of the algorithms has been investigated when P1P1 finite element discretization is used for the parallel solution of the Navier-Stokes equation. Two-dimensional and three-dimensional Laplace equations are calculated to estimate the speedup of the preconditioners. Calculation domain is partitioned by one- and multi-dimensional partitioning methods in structured grid and by METIS library in unstructured grid. For the domain-decomposed parallel computation of the Navier-Stokes equation, we have solved three-dimensional lid-driven cavity and natural convection problems in a cube as benchmark problems using a parallelized fractional 4-step finite element method. The speedup for each parallel preconditioning method is to be compared using upto 64 processors.
최형권,유정열 대한기계학회 1994 대한기계학회논문집 Vol.18 No.3
A numerical method which combines equal-order velocity-pressure formulation originated from SIMPLE algorithm and streamline upwinding method has been developed. To verify the proposed numerical method, we considered the lid-driven cavity flow and backward facing step flow. The trend of convergence history is stable up to the error criterion beyond which the maximum value of error is oscillatory due4 to the round-off error. In the present study, all results were obtained with the single precision calculation up to the given error criterion and it was found to be sufficient for our purpose. The present results were then compared with existing experimental results using laser doppler velocimetry and numerical results using finite difference method and mixed interpolation finite element method. It has been shown that the present method gives accurate results with less memories and execution time than the coventional finite element method.