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Zhong Yun,Chuang Xiang,Liang Wang 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.6
The temperature of blood pumps and other left ventricular assistance devices (LVAD) increases during operation due to the effects of the electromagnetic drive and mechanical work. The blood is heated when passing through an LVAD. Temperature can influence erythrocytes' mechanical properties and erythrocytes' threshold shear stress for hemolysis in shear flow. A nonlinear two-dimensional membrane model was introduced based on the linear spring network model and nonlinear worm-like-chains (WLC) model. The simulation of erythrocytes in shear flow was performed in the framework of the immersed boundary-lattice Boltzmann method (IB-LBM). When the shear stress was set to the often-cited threshold for hemolysis of 400~Pa and the temperature was 37$^\circ$C, the free energy change of the erythrocyte membrane was calculated to be 3.5\:$\times$\:$10^{-15}$J, which was defined as the threshold value of erythrocytes' membrane energy change for hemolysis. As the temperature rose to 39$^\circ$C, 41$^\circ$C and 43$^\circ$C, the shear stress varied from 200 to 400~Pa, the free energy changed, and the shape parameters were studied. By comparing the threshold energy changes, we found the threshold shear stress values at 39$^\circ$C, 41$^\circ$C and 43$^\circ$C to be 340, 315 and 295~Pa, respectively. Whether red blood cells (RBCs) are damaged when passing through an LVAD can be determined according to these data. This work should provide a basis for LVAD design and optimization.
Adaptive Sampling for ECG Detection Based on Compression Dictionary
Zhongyun Yuan,Jong Hak Kim,Jun Dong Cho 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.6
This paper presents an adaptive sampling method for electrocardiogram (ECG) signal detection. First, by employing the strings matching process with compression dictionary, we recognize each segment of ECG with different characteristics. Then, based on the non-uniform sampling strategy, the sampling rate is determined adaptively. As the results of simulation indicated, our approach reconstructed the ECG signal at an optimized sampling rate with the guarantee of ECG integrity. Compared with the existing adaptive sampling technique, our approach acquires an ECG signal at a 30% lower sampling rate. Finally, the experiment exhibits its superiority in terms of energy efficiency and memory capacity performance.
Adaptive Sampling for ECG Detection Based on Compression Dictionary
Yuan, Zhongyun,Kim, Jong Hak,Cho, Jun Dong The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.6
This paper presents an adaptive sampling method for electrocardiogram (ECG) signal detection. First, by employing the strings matching process with compression dictionary, we recognize each segment of ECG with different characteristics. Then, based on the non-uniform sampling strategy, the sampling rate is determined adaptively. As the results of simulation indicated, our approach reconstructed the ECG signal at an optimized sampling rate with the guarantee of ECG integrity. Compared with the existing adaptive sampling technique, our approach acquires an ECG signal at a 30% lower sampling rate. Finally, the experiment exhibits its superiority in terms of energy efficiency and memory capacity performance.
심층 학습을 위한 한국어 PAD 수업 모형 적용 사례 연구 -중국인 한국어 학습자를 대상으로-
서중운 ( Xu Zhongyun ),이길련 ( Li Jilian ) 한민족문화학회 2022 한민족문화연구 Vol.78 No.-
이 연구는 중국에서 한국어 학습자의 심층 학습을 촉진하기 위하여 한국어 수업에 PAD 모형의 적용을 제안하는 것을 목적으로 하고, 실제 한국어 수업에서 PAD 모형을 활용하는 교육 방안을 설계하여 실시한 실례를 보고하였다. 중국에서 한국어 수업 현황에 대한 관찰과 분석을 기반으로 강의식 수업의 문제점과 토론식 수업의 한계점을 제기하고 이 두 가지 수업 모형의 장점을 겸비하는 PAD 수업 모형의 합리성을 살펴보았다. 그리고 중급 수준을 갖는 중국인 학습자들을 대상으로 PAD 수업 방안을 설계하고 실시하여 학습자들이 이러한 수업 방식에 대한 만족도를 조사하였다. 현재까지 중국의 한국어 교육 분야에서 학습자의 심층 학습을 위한 PAD 수업 모형을 제안하고 실제 교육 과정에서 적용해 본 실증연구가 없었던 점을 감안할 때 이 연구가 나름의 의의가 있을 것으로 본다. This study aimed to propose the application of the PAD model to Korean language classes in order to promote the deep learning of Korean learners in China, and reported examples of designing and implementing an educational plan that utilizes the PAD model in actual Korean language classes. Based on the observation and analysis of the current situation of Korean Teaching in China, this paper pointed out the problems of teaching class and the limitations of discussion class, and examined the rationality of PAD teaching mode, which has the advantages of these two teaching modes. The PAD teaching scheme was designed and implemented for Chinese learners with intermediate level, and the learners' satisfaction with this teaching method was investigated. Considering that there has been no empirical study that proposed a PAD class model for deep learning of learners in the field of Korean language education in China and applied it in the actual education process, this study is expected to have its own significance.
서중운 ( Xu-zhongyun ) 한국어교육연구소 2019 한국어교육연구 Vol.14 No.1
이 글은 기존의 스키마 이론에 근거한 읽기 교육 연구와 마인드맵을 활용한 교육 연구를 검토하고 그 한계점을 제시하였다. 스키마 이론에 근거한 읽기 교육 선행연구들은 텍스트 선정이나 교수 과정에만 집중하고 학습자 사고방식을 구체화하지 못하였고 마인드맵을 활용한 선행연구들은 학교 수업 내용이나 학습 평가에 접목하지 못하였다는 아쉬움을 안고 있었다. 이 글은 선행연구들을 기초로 마인드맵을 활용한 새로운 한국어 읽기 지도방법을 적용하여 효과적인 읽기 교육방법과 읽기 평가 기제를 모색해 보았다. 교재 내용인“음식 속에 담긴 의미”를 실례로 마인드맵을 적용시켜 읽기 전 단계, 읽기 단계, 읽은 후 단계를 나누어 읽기교육의 새로운 방법을 제시하고 마인드맵에서 제기된 인간 두뇌의 사유능력의 네 가지 "발산성", "연상성", "조리성", "전체성" 등을 평가기준에 반영되어야함을 제시함으로써 기존의 경직된 참고답안에 사고를 맞추는 평가형식에서 탈피하고자 하였다. 그리고 마인드맵을 활용한 한국어 교육 연구는 아직 초창기여서 실증연구가 부족해 또 활용 후 평가 기제를 체계화하는 것이 아직 많은 연구 과제가 남아 있다고 밝혔다. This paper reviewed the former researches on reading education based on Schema Theory and Mind-map Theory, then pointed out their limitations. Researches based on Schema Theory paid too much attention to text selection and teaching process. As a result, it failed to crystallize students’ thinking patterns. Researches based on Mind-map Theory regrettably was not combined with learning contents or evaluation tests. On the basis of former researches, this paper applied Mind-map Theory to the teaching process of Korean reading and explored effective ways of reading education and evaluation. Taking ‘Meanings Implied in Foods’ from a real textbook as an example, this paper put forward a new teaching method according to Mind-map Theory which divides reading education into 3 stages: before reading, reading and after reading. This paper opposes the traditional evaluation method which forces students to think in accordance with rigid answer keys. Instead, it holds the opinion that people’s thinking ability should be evaluated by the following four criteria which are put forward in Mind-map Theory: divergence, association, organization and integrity. Korean education research based on Mind-map Theory is still on its initial stage. Empirical studies are not adequate and the crystallization of evaluation system after using Mind-map remains a question for study.
Repeatability of Tensile Properties in High Pressure Die-Castings of an Al-Mg-Si-Mn Alloy
Hailin Yang,Shouxun Ji,Douglas Watson,Zhongyun Fan 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.5
High pressure die-castings of an Al-Mg-Si-Mn alloy have been assessed in terms of the repeatability of the mechanical properties including yield strength, ultimate tensile strength and elongation by the normal standard deviations method and by the Weibull statistical model with three parameters. It was found that the round samples had the maximum Weibull modulus, indicating the best repeatability. The machined samples exhibited the second best of Weibull modulus. Among the square samples, the 2 mm and 5 mm thick samples had the lowest and the highest Weibull modulus respectively, indicating that the repeatability for the castings was influenced by the wall thickness. The microstructural uniformity and porosity levels are critical factors in determining the repeatability of the high pressure die-castings. A less segregation in the microstructure could uniform the stress distribution in the die-castings and a less porosity in the casting could reduce the sources for brittle fracture. These improved the repeatability in casting production.