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Joonghak Lee(Joonghak Lee),Youngwoo Kim(Youngwoo Kim),Jisang Kang(Jisang Kang) The International Academy of Global Business and T 2023 The International Academy of Global Business and T Vol.19 No.1
Purpose - Digital transformation is the key to success for recent multinational corporates. Ample studies have paid attention to the effectiveness of digital transformation and usage of advanced technology, but there is a lack of research related to how to prepare for digital transformation. The main purpose of this study is to organize specific case of preparation for digital transformation from a management perspective. In addition, the empirical results are presented to examine the impact of the preparation of the digital transformation. Design/Methodology/Approach - The study first reviews previous literature about digital transformation to organize antecedents, theory, contingency, and outcomes. Second, based on the resource-based view, a case is explained the company’s context, processes, and methodology. Lastly, empirical analysis is conducted to investigate how effective the digital transformation is prepared, and results are presented with data from 50 affiliations and 1,059 employees. Findings - This study finds the key to successful digital transformation is well-prepared talent, and suggests how multinational corporates can be ready for talent selection and development. Furthermore, readiness in digital transformation in talent varies by industry, company, and employee characteristics. Then, the study implies successful digital transformation should consider a contingency. Research Implications - The current study expands the knowledge on digital transformation by suggesting an actual case of South Korean multinational corporations, which allows researchers and practitioners to understand the process and methodology. Second, this research extended the discussion of digital transformation to talent selection preparation since previous literature has focused only on recent technology. Lastly, the study introduces the empirical results of preparation for digital transformation and helps practitioners initiate digital transformation in their organizations.
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.
Younghwa Lee,Sukki Yoon,Youngwoo Lee,Marla B. Royne 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
We study liberals and conservatives in the United States and Korea to see how they respond to charity advertising that appeals to either equality or proportionality. The findings robustly demonstrate that in both countries, liberals respond more favorably to equality appeals, but conservatives respond more favorably to proportionality appeals. Study 1, conducted in the United States, finds that liberals find equality appeals more effective, but conservatives find proportionality appeals more effective. Study 2, conducted in Korea, shows that liberals (conservatives) estimate that they are more (less) likely to receive rewards for donating when charity advertising uses equality rather than proportionality appeals.
Proximate In-Phase Current Estimator to Reduce Torque Ripple in Permanent-Magnet Stepping Motor
Youngwoo Lee,Donghoon Shin,Wonhee Kim,Chung Choo Chung IEEE 2016 IEEE transactions on industrial electronics Vol.63 No.3
<P>This paper proposes microstepping via a proximate in-phase current estimator (PIpCE) to improve position control performance with reduced torque ripples in permanent-magnet (PM) stepping motors. In conventional microstepping control, low-pass filters (LPFs) are used to filter out measurement noise resulting from the implemented current feedback loops. However, the phase lag caused by LPFs can degrade position control performance. In this paper, we propose a current tracking controller with PIpCE. The globally uniformly ultimately bounded current tracking error is proved via the Lyapunov theory. The proposed PIpCE also enhances current tracking performance over that of the conventional method. The proposed controller not only reduces the torque ripple caused by the phase lag but also increases the operational range of microstepping by pushing the electromechanical resonance frequency to a high-frequency region. We experimentally validated the effectiveness of the proposed method and observed that this method provides uniform position tracking performance without step-out or speed reversal, even in high-speed operation.</P>
Position Control of Active Magnetic Bearings using Linear Parameter Varying Synthesis
Youngwoo Lee,Seung-Hi Lee,Donghoon Shin,Wonhee Kim,Chung Choo Chung 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, gain scheduling linear parameter varying (LPV) controller is proposed to regulate position of active magnetic bearings (AMBs). To regulate the position error of AMB rotor, H∞ optimal control method is used. The gain scheduling LPV system is developed based on rotating velocity of AMB. Simulation results validate the effectiveness of the proposed method.
Youngwoo Bryan Yoon,Minah Kim,Junhee Lee,Kang Ik K,Cho,Seoyeon Kwak,Tae Young Lee,Jun Soo Kwon 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.3
We aim to investigate the effect of fronto-temporal transcranial direct current stimulation (tDCS) on the interactions among functional networks and its association with psychotic symptoms. In this pilot study, we will determine possible candidate functional networks and an adequate sample size for future research. Seven schizophrenia patients with treatment-refractory auditory hallucinations underwent tDCS twice daily for 5 days. Resting-state fMRI data and measures of the severity of psychotic symptoms were acquired at baseline and after completion of the tDCS sessions. At baseline, decreased functional network interaction was negatively correlated with increased hallucinatory behavior. After tDCS, the previously reduced functional network connectivity significantly increased. Our results showed that fronto-temporal tDCS could possibly remediate aberrant hallucination-related functional network interactions in patients with schizophrenia.
Lee, Sung Kyun,Kim, Sang Doo,Kook, Minsoo,Lee, Ha Young,Ghim, Jaewang,Choi, Youngwoo,Zabel, Brian A.,Ryu, Sung Ho,Bae, Yoe-Sik The Rockefeller University Press 2015 The Journal of experimental medicine Vol.212 No.9
<P>Lee et al. find that phospholipase D2 deficiency increases survival and decreases organ damage during experimental sepsis in mice which could be reversed with a CXCR2 antagonist. Thus, targeting PLD2 may offer therapeutics for septic patients.</P><P>We determined the function of phospholipase D2 (PLD2) in host defense in highly lethal mouse models of sepsis using PLD2<SUP>−/−</SUP> mice and a PLD2-specific inhibitor. PLD2 deficiency not only increases survival but also decreases vital organ damage during experimental sepsis. Production of several inflammatory cytokines (TNF, IL-1β, IL-17, and IL-23) and the chemokine CXCL1, as well as cellular apoptosis in immune tissues, kidney, and liver, are markedly decreased in PLD2<SUP>−/−</SUP> mice. Bactericidal activity is significantly increased in PLD2<SUP>−/−</SUP> mice, which is mediated by increased neutrophil extracellular trap formation and citrullination of histone 3 through peptidylarginine deiminase activation. Recruitment of neutrophils to the lung is markedly increased in PLD2<SUP>−/−</SUP> mice. Furthermore, LPS-induced induction of G protein–coupled receptor kinase 2 (GRK2) and down-regulation of CXCR2 are markedly attenuated in PLD2<SUP>−/−</SUP> mice. A CXCR2-selective antagonist abolishes the protection conferred by PLD2 deficiency during experimental sepsis, suggesting that enhanced CXCR2 expression, likely driven by GRK2 down-regulation in neutrophils, promotes survival in PLD2<SUP>−/−</SUP> mice. Furthermore, adoptively transferred PLD2<SUP>−/−</SUP> neutrophils significantly protect WT recipients against sepsis-induced death compared with transferred WT neutrophils. We suggest that PLD2 in neutrophils is essential for the pathogenesis of experimental sepsis and that pharmaceutical agents that target PLD2 may prove beneficial for septic patients.</P>
PID controller with Feedforward Low Pass Filters for Permanent Magnet Stepper Motors
Youngwoo Lee,Donghoon Shin,Chung Choo Chung 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
In this paper, PID controller with feedforward low pass filters (FLPFs) is developed to guarantee desired currents for a permanent magnet stepper motor (PMSM). The proposed method consist of position controller and FLPFs. The position controller consists of a PID controller, a commutation scheme, and a Lyapunov based controller. To generate the desired torque, the PID controller is incorporated. Commutation scheme is developed to generate the desired currents. Lyapunov based controller is used to guarantee the desired currents. The FLPFs are developed to filter out high frequency noises of measured state and compensate for the phase lag caused by the conventional LPFs. Using the Lyapunov theory, we prove that globally asymptotical stability of currents errors is ensured by the proposed method. Experimental results validate the effectiveness of the proposed method.