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Korea Jeju District Court Second Criminal Department The decision
Jaegal Chang,Chung Sung-jin,Seo Youngwoo 세계섬학회 2019 World Environment and Island Studies Vol.9 No.4
Korea Jeju District Court Presiding Judge Jaegal, Chang, Judge Chung, Seung-jin, and Judge Seo, Youngwoo declared Jeju District Court Second Criminal Department The Decision on January 17, 2019. The indictment against the accused is applicable when ‘the procedure for filing an appeal is invalid in violation of legal regulations’, according to Article 327 No. 2 of the Criminal Procedure Act, all charges against the accused should be dismissed. Hee Chun Oh (330824-2******) Unemployed.
Noninvasive Brain Stimulation Using a Modulated Microwave Signal
Taeyoon Seo,Seongwoog Oh,Dahee Jung,Yeowool Huh,Jeiwon Cho,Youngwoo Kwon 한국전자파학회JEES 2018 Journal of Electromagnetic Engineering and Science Vol.18 No.1
We propose a microwave signal generation system for brain stimulation. The existing brain stimulation system uses a signal of several tens of kHz, and the magnetic field distribution is wide. Microwave is used to locally limit the distribution of the electromagnetic field and to change the action potential of the cell with less power. The switch modulates the microwave signal to obtain a pulse envelope. The action potential of the cell can be controlled to the excitation/inhibition state by adjusting the repetition frequency. These results are confirmed by measuring the cell potential of the mouse brain.
Simplified Nonlinear Control for Planar Motor based on Singular Perturbation Theory
HyungDuk Seo(서형덕),Donghoon Shin(신동훈),Youngwoo Lee(이영우),Chung Choo Chung(정정주) 대한전기학회 2015 전기학회논문지 Vol.64 No.2
In this paper, we propose the nonlinear control based on singular perturbation theory for position tracking and yaw regulation of planar motor. Singular perturbation theory is characterized by the existence of slow and fast transients in the system dynamics. The proposed method consists of auxiliary control to decouple error dynamics. We develop model reduction with control input. Also, we derIve decoupled error dynamics with auxiliary input. The controller is designed in order to guarantee the desired position and yaw regulation without current feedback or estimation. Simulation results validate the effect of proposed method.
XR 콘텐츠 UI/UX 평가를 위한 VR 스마트 팩토리 교육훈련 콘텐츠 제작
이영우(YoungWoo Lee),임익수(EekSu Leem),이수민(Su Min LEE),김현식(Hyun Sik Kim),강민구(Mingoo Kang),이창교(Chang-kyo Lee),서정욱(Jeongwook Seo) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.2
이 논문에서는 제조 분야에 디지털 트윈 기반 XR 콘텐츠의 UX/UI 디자인 및 사용성 평가를 위하여 범용적인 콘텐츠 소프트웨어와 달리, HDM의 의존성이 큰 XR 콘텐츠의 특성을 반영하기 위해, 공정수행작업 시나리오에 맞춘 XR 콘텐츠를 제작하였다. XR 콘텐츠의 공정수행 작업 시나리오를 수행하기 위해 Qculus Quest2라는 HMD장비를 사용하였으며, 콘텐츠 제작은 Unity 엔진[1]과 SteamVR Plugin을 통해 제작되었다. In this paper, VR smart factory XR content tailored to process execution scenarios was produced to reflect the characteristics of XR content, which is highly dependent on HDM, unlike general-purpose content software for UX/UI design and usability evaluation of digital twin-based XR content in manufacturing. HMD equipment called Qculus Quest2 was used to perform the process execution task scenario for XR content, and content production was made through Unity Engine and Steam VR Plugin.
A Simplified Nonlinear Control for Sawyer Motors based on Singular Perturbation Theory
Hyungduk Seo,Donghoon Shin,Youngwoo Lee,Chung Choo Chung 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In this paper, we propose the nonlinear control based on singular perturbation theory for position tracking and yaw regulation of Sawyer motor. The method of singular perturbation is characterized by the existence of slow and fast transients in the system dynamics. Thus, we can apply to singular perturbation at sawyer motor due to separated motor dynamics into slow and fast dynamics. The proposed method so as to decouple error dynamics consist of auxiliary control. The controller is developed in order to guarantee the desired position and yaw regulation without current feedback or estimation. Simulation results validate the adequation of proposed method.
Global Well-Posedness for Higher-Order Schrödinger Equations in Weighted L2 Spaces
Koh, Youngwoo,Seo, Ihyeok Taylor Francis 2015 Communications in partial differential equations Vol.40 No.10
<P>We obtain the global well-posedness for Schrodinger equations of higher orders in weighted L-2 spaces. This is based on weighted L-2 Strichartz estimates for the corresponding propagator with higher-order dispersion. Our method is also applied to the Airy equation which is the linear component of Korteweg-de Vries type equations.</P>
Koh, Youngwoo,Seo, Ihyeok Discrete and Continuous Dynamical Systems 2017 Discrete and continuous dynamical systems Vol.37 No.9
<P>We obtain weighted L-2 Strichartz estimates for Schrodinger equations i partial derivative(t)u + (-Delta)(u)(a/2) = F(x, t), u(x, 0) = f(x), of general orders a > 1 with radial data f, F with respect to the spatial variable x, whenever the weight is in a Morrey-Campanato type class. This is done by making use of a useful property of maximal functions of the weights together with frequency-localized estimates which follow from using bilinear interpolation and some estimates of Bessel functions. As consequences, we give an affirmative answer to a question posed in [1] concerning weighted homogeneous Strichartz estimates, and improve previously known Morawetz estimates. We also apply the weighted L-2 estimates to the well-posedness theory for the Schrodinger equations with time-dependent potentials in the class.</P>
Crisis Management Strategies of Startups in the COVID-19 Pandemic
Ribin Seo,Youngwoo Lee 한국APEC학회 2021 Journal of APEC Studies Vol.13 No.1
The survival and growth of entrepreneurial startups system are threatened by the unprecedented exogenous shock of the COVID-19 pandemic. While startups play pivotal roles in a country’s national innovation system, “what, why, and how” they act against the crisis has remained an underexplored topic. This study aims at identifying specific government policy initiatives to protect the firms’ survival during the crisis and counterstrategies employed by startups in the crisis management processes. Our quantitative analysis of 91 policy initiatives in 40 countries against the COVID-19 economic crisis indicates that governments focus mainly on providing short-term financial supports such as interest/tax benefits, payment delays, and wage subsidies for small and medium-sized enterprises. In contrast, startup-specific supports buffering from the lack of investment and financial capital were insufficient. Another qualitative analysis of interviews with 16 actors in entrepreneurial ecosystems reveals that Korean startups are leveraging the productive utilization of available resources through business model improvements, organizational restructuring, and external networks against the high illiquidity caused by the crisis. Startups are also required to remain resilient in the entrepreneurial crisis management process by adopting bricolage responses allowing high agility and adaptability for seeking alternative business opportunities in times of crisis.