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THE NUMERICAL SOLUTION OF SHALLOW WATER EQUATION BY MOVING MESH METHODS
Suyeon Shin,Woonjae Hwang 충청수학회 2012 충청수학회지 Vol.25 No.3
This paper presents a moving mesh method for solving the hyperbolic conservation laws. Moving mesh method consists of two independent parts: PDE evolution and mesh- redistribution. We compute numerical solution of shallow water equation by using moving mesh methods. In comparison with computations on a ¯xed grid, the moving mesh method appears more accurate resolution of discontinuities.
Integrated microfluidic pneumatic circuit for point-of-care molecular diagnostics
Shin, Suyeon,Kim, Byeongyeon,Kim, Yoon-Jin,Choi, Sungyoung Elsevier 2019 Biosensors & bioelectronics Vol.133 No.-
<P><B>Abstract</B></P> <P>Developing simple, portable, rapid, and easy-to-use diagnostic technologies is essential for point-of-care (POC) blood molecular testing. Integrated microfluidic devices that include the functionalities of blood separation, microfluidic pumping, and molecular detection are desirable for POC testing; however, current technologies still rely on off-chip sample processing or require bulky equipment. We report a fully-integrated microfluidic diagnostic device, i.e., an integrated pneumatic microfluidic circuit (iPC), that can autonomously pump whole blood, continuously sort blood plasma, and readily enable blood plasma proteomic analysis. The iPC contains vacuum pillars as a vacuum source and waste reservoir, as well as microchannels connecting the pillars as a plasma separator or a flow stabilizer. We combined the iPC and a miniaturized fluorescence microscope to create a portable diagnostic platform that enables fluorescence-based biomarker detection. First, we performed systematic parametric studies to establish design rules for determining the transport and distribution of fluid streams in the iPC. We then demonstrated the capability of the iPC-based diagnostic platform by successfully separating blood plasma from microliter quantities of whole blood while simultaneously quantifying thrombin in blood samples using an aptamer beacon within 5 min of sample injection. Our platform holds potential as a rapid, field-deployable, essentially universal diagnostic tool in POC settings.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Integrated microfluidic pneumatic circuit for autonomous aptamer-based molecular detection. </LI> <LI> Establishment of the design rules for the fluid transport and distribution in a vacuum-driven pneumatic channel circuit. </LI> <LI> High-purity blood plasma separation using the integrated microfluidic pneumatic circuit. </LI> <LI> In-situ thrombin detection from blood samples using the integrated microfluidic pneumatic circuit. </LI> </UL> </P>
Shin, Suyeon,Sohn, Sung-Ik,Hwang, Woonjae Elsevier 2018 European journal of mechanics. B, Fluids Vol.67 No.-
<P><B>Abstract</B></P> <P>In this paper, we study long-time evolutions of the Kelvin–Helmholtz instability with surface tension and density jump by using the vortex sheet model. Applying a spectrally accurate numerical method, we investigate effects of surface tension and density jump on the instability in various regimes of parameters. The numerical results show that by varying the density ratio, the large-scale feature of the roll-up of the interface is basically similar, but the structure of the inner roll-up is significantly different. At high Weber numbers, the interface collides with itself at the finger tip for low Atwood numbers, but for high Atwood numbers, the finger is pinched off. The dispersive waves and corrugations on the interface are more prominent for low Atwood numbers. For a very high Weber number, the finger of the interface becomes small, while for a low Weber number, the interface has a structure of long filament. Results for initial multi-mode perturbations show the competition and merging of fingers as well as pinching and elongation.</P>
Yangjin Shin,Sungyoul Park,Sewan Choi,Suyeon Cho,Hochang Jung,Junsung Park,Waegyeong Shin,Deokjin Kim 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper propose a novel winding changeover circuit that can maximize the average efficiency in the wide speed range to extend the driving distance of the Electric Vehicle and improve the fuel efficiency. Proposed circuit is Series-Parallel changeover circuit based thyristor. Due to the characteristics of the thyristor, it is possible to achieve a seamless transient state without interruption. So no additional snubber circuit is required and high efficiency and light weight of AC motor system can be expected because of low switch loss. The proposed winding changeover circuit is validated through simulation and experimental results with 80kW AC motor.
A TREATMENT OF CONTACT DISCONTINUITY FOR CENTRAL UPWIND SCHEME BY CHANGING FLUX FUNCTIONS
MOUNGIN SHIN,SUYEON SHIN,WOONJAE HWANG 한국산업응용수학회 2013 Journal of the Korean Society for Industrial and A Vol.17 No.1
Central schemes offer a simple and versatile approach for computing approximate solutions of nonlinear systems of hyperbolic conservation laws. However, there are large numerical dissipation in case of contact discontinuity. We study semi-discrete central upwind scheme by changing flux functions to reduce the numerical dissipation and we perform numerical computations for various problems in case of contact discontinuity.
신종호(Shin Jongho),이신형(Rhee Shin Hyung),윤주현(Eune Juhyun),조은별(Cho Eunbyul),백아롱(Beik Ahrong),조수연(Jo Suyeon),이병윤(Lee Byung Yoon) 한국창의력교육학회 2017 창의력교육연구 Vol.17 No.1
본 연구는 예술경험이 공학 창의성에 영향을 미치는지, 영향을 미친다면 관련된 예술경험의 속성은 무엇 인지를 확인하고자 예술경험을 가진 공학도를 대상으로 개인 경험과 인식에 대한 질적 연구를 실시하였다. 연구 결과, 예술경험은 공학 창의성에 긍정적인 영향을 미쳤으며, 다섯 가지의 예술경험 속성이 주로 관련 된 것을 확인할 수 있었다. 첫째, 자아인식 경험이다. 자아인식 결과는 창의성을 발현할 수 있는 공학 연구 의 방향과 전략을 구체화하는 데에 적용되었다. 둘째, 직관을 활용한 경험이다. 예술경험을 통해 강화된 직 관이 공학 연구에 적용되었으며, 기존의 전략을 보완하면서 보다 창의적인 문제해결을 이끌어냈다. 셋째, 한계를 극복하는 경험이다. 한계를 극복한 예술경험이 있을 때, 새로운 공학 연구에 실질적으로 적용할 수 있는 예술 영역의 지식을 확보하였다. 넷째, 타인지향적 표현 경험이다. 감상자의 공감과 이해를 중시하는 예술 분야의 표현 경험을 연구의 성과 공유에 도입함으로써, 이들의 공학 창의성은 보다 긍정적인 사회적 평가를 이끌어냈다. 다섯째, 카타르시스 경험이다. 카타르시스 경험은 연구 과정에서 발생하는 부정 정서를 해소하고 손상된 심리적 자원을 회복하도록 하여 연구에서의 창의성 발현이 가능한 심리 상태를 확보하도 록 하였다. 본 연구는 공학 영역에서의 창의성 교육에서 예술경험을 적용하는 방법을 모색하는 근거가 되 었다는 점에서 의의를 가진다. The purpose of this study is to find whether artistic experience affects engineering creativity, if it does, which characteristics of artistic experience influence engineering creativity. In order to do so, a qualitative study is conducted for engineers who have some artistic experience. The results showed that artistic experience affects positively engineering creativity, and that there are five characteristics of artistic experience influencing engineering creativity. First, they had a clear self-awareness experience. Being aware of oneself was applied to specifying directions and strategies of engineering research in which they could manifest creativity. Second, they utilize their intuition. Their intuition was used in their engineering research, which led them to creative problem solving by reinforcing the existing ways. Third, they have challenged their limit and tried to overcome it. When they had some artistic experience, which made them challenge their limit and overcome it, they were able to try a new research in engineering and secure related knowledge and information that can actually be applied to their research. Fourth, they had an others-oriented experience. As they adopt their appreciating experience, which puts emphasis on empathy and understanding, into their research performance, their creativity gained positive social recognition. Fifth, they had a cathartic experience. A cathartic experience helps to reduce negative feelings, which could happen during an engineering tasks, and to recover that hurt feelings so the engineers could be at the stage in which they could manifest creativity with a psychological stability. Finally, this study suggests further directions for creativity education and future research.