가상현실 수업시뮬레이션에서 정서 판단을 위한 EEG 기반의 심층신경망 모형개발

임성민 ( Sungmin Lim ),양은별 ( Eunbyul Yang ),임태형 ( Taehyeong Lim ),류지헌 ( Jeeheon Ryu ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2021 교육정보미디어연구 Vol.27 No.1

이 연구의 목적은 가상현실 수업시뮬레이션에서 학습자의 정서적 상호작용을 촉진하기 위한 심층신경망 기반의 정서 판단모형을 개발하는 것이다. 이를 위해 공개된 EEG(electroencephalogram) 데이터인 AMIGOS(A dataset for Multimodal research of affect, personality traits and mood on Individuals and GrOupS) 데이터세트를 활용하여 심층신경망(deep neural network) 기반의 정서 판단모형을 개발했다. 정서 상태 분류에는 PAD(Pleasure-arousal-dominance) 정서모형을 적용하였다. 10개의 은닉층과 각 378개의 노드로 구성된 모형을 설계하고, 374만개의 훈련용 데이터를 활용하여 각각 정확도가 96.23%(즐거움), 96.98% (각성), 96.47%(통제감)인 심층신경망 모형을 개발하였다. 12명의 실험참가자가 가상현실 수업시뮬레이션을 경험하는 과정에서 Emotiv EPOC+를 활용하여 EEG 데이터를 수집하였다. 수집된 데이터를 개발한 정서 판단모형에 적용하여 학습자의 정서 상태를 판단하고, 시계열 그래프와 3차원 산포도로 시각화하여 학습자의 정서 상태를 분류하였다. 연구결과에 따르면, 실험참가자들의 정서 차원은 두 가지 정서 상태, 못마땅함(unsatisfied)과 어찌할 바 모름(helpless)으로 수렴됨을 확인할 수 있었다. 이는 심층 신경망으로 구현한 정서 판단모형을 통해 학습자의 EEG데이터를 기반으로 정서판단이 가능할 수 있음을 의미한다. 이를 통해 가상현실 시뮬레이션 환경에서 정서적 상호작용을 촉진하는 학습설계 방안에 대해 논의하였다. The purpose of this study was to develop a deep neural network model for emotion model to identify the possibility of promoting the emotional interaction of users in virtual reality simulation. A deep neural network-based emotional model was developed using the open-source electroencephalogram (EEG) data, AMIGOS (A dataset for Multimodal research of affect, personality traits and mood on Individuals and GrOupS) dataset. The Pleasure-Arousal-Dominance (PAD) temperament model was employed to classify the users’ emotional state. The prediction model was designed to consist of 10 hidden layers and 378 nodes each, and the accuracy was 96.23% (pleasure), 96.98% (arousal), and 96.47% (dominance) using 3,740,000 training data. In this experiment, twelve adults experienced a virtual reality teaching simulation and their EEG data were collected using Emotiv EPOC+. The EEG data was applied to the developed prediction model to decide the users’ emotional state. The participants’ emotional state was classified by visualizing a time series graph and a 3D scatter plot. Results showed that the users’ emotional state converged into two categories, unsatisfied and helpless. It indicates that it is possible to judge users’ emotional state through the prediction model. Learning design strategies that promotes emotional interaction in a virtual reality simulation were discussed.

국민참여재판의 현황 및 활성화 방안에 관한 연구 - 실시요건 개선을 중심으로 -

임성민 ( Lim Sungmin ),김성화,양승욱,이단비 사법정책연구원 2024 연구보고서 Vol.2024 No.8

Multi stimuli-responsive hydrogel microfibers containing magnetite nanoparticles prepared using microcapillary devices

Lim, Daeun,Lee, Eunsu,Kim, Haneul,Park, Sungmin,Baek, Seulgi,Yoon, Jinhwan The Royal Society of Chemistry 2015 SOFT MATTER Vol.11 No.8

<P>Extensive research efforts have been devoted to the development of hydrogel microfibers for tissue engineering, because the vascular structure is related to the transport of nutrients and oxygen as well as the control of metabolic and mechanical functions in the human body. Even though stimuli-responsive properties would enhance the potential applicability of hydrogel microfibers for artificial tissue architectures, previous studies of their fabrication have not considered changes in the microfibers in response to external stimuli. In this work, we prepared temperature-responsive poly(<I>N</I>-isopropylacrylamide) (PNIPAm) microfibers with controlled shapes and sizes by the <I>in situ</I> photo-polymerization of aqueous monomers loaded in calcium alginate templates generated from microcapillary devices. We found that the shape and size of the hydrogel microfibers could be controlled by adjusting the injection positions of the solutions and varying the diameters of the inner capillary, respectively. We further fabricated light-responsive materials by incorporating photothermal magnetite nanoparticles (MNPs) within the temperature-responsive PNIPAm hydrogel microfibers. Because the MNPs incorporated into the PNIPAm microfibers generated heat upon the absorption of visible light, we could demonstrate volume changes in the microfibers triggered by both visible light irradiation and temperature.</P> <P>Graphic Abstract</P><P>Hydrogel microfibers containing magnetite nanoparticles prepared using a microfluidic device show a volume change in response to the visible light irradiation as well as increasing temperature. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4sm02564d'> </P>

Effect of shortening replacement with oleogels on the rheological and tomographic characteristics of aerated baked goods

Lim, Jeongtaek,Jeong, Sungmin,Lee, JaeHwan,Park, Sungkwon,Lee, Jonggil,Lee, Suyong John Wiley Sons, Ltd 2017 Journal of the Science of Food and Agriculture Vol.97 No.11

<P>CONCLUSION: Use of the oleogels as a shortening replacer at a ratio of 1:3 by weight was effective in producing muffins with comparable quality attributes to the control with shortening. (C) 2017 Society of Chemical Industry</P>

Evaluation of soybean oil-carnauba wax oleogels as an alternative to high saturated fat frying media for instant fried noodles

Lim, Jeongtaek,Jeong, Sungmin,Oh, Im Kyung,Lee, Suyong Elsevier 2017 FOOD SCIENCE AND TECHNOLOGY -ZURICH- Vol.84 No.-

<P>Soybean oil was structured with carnauba wax to develop solid-like oleogels that were evaluated in instant fried noodles as an alternative to deep-fat frying medium containing high saturated fat. A more rapid change in viscosity with temperature was observed in the oleogels with increasing levels of carnauba wax. Upon heating, the storage (G') and loss (G') moduli of oleogels and palm oil decreased with a greater temperature dependence of G', showing the crossover of G' and G'. Compared to the palm and soybean oil-fried noodles, the samples fried in the oleogels absorbed approximately 16% less oil which could be correlated with their scanning electron microscopic images. However, there were no negative effects on the noodle texture. The levels of saturated fatty acids in the oleogel-fried noodles were significantly reduced (19 g/100 g), compared to the palm oil-fried noodles (54 000 g). Lower peroxide values during storage were observed in the following order: palm oil, oleogel, and soybean oil fried noodles. (C) 2017 Elsevier Ltd. All rights reserved.</P>

뇌경색을 후유증으로 남긴 뇌형 말라리아 1예

임영석,이준행,박동영,김범,백경란,김성민,권오정,송재훈 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1

저자들은 53세 남자로서 파키스탄을 여행한 직후 열대열원충으로 인한 뇌형 말라리아가 발병되어 혼수에까지 이르렀고, 적절히 치료하였으나 뇌기저핵의 경색과 신경학적 휴우증을 남겼던 1례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. In recent years, the incidence of imported cases with falciparum malaria has been increasing in Korea due to marked increase in travel to malarious area without adequate prophylaxis. Cerebral malaria is and encephalophaty which can complicate some patients infected with Plasmodium falciparum leading to significant mortality. We report a case of 53 year-old male with cerebral malaria who was thought to be infected in Pakistan. Blood smear showed typical intra-erythrocytic ring form trophozoites and banana-shaped gametocytes of P. falciparum. The patient had been in comatose state for a week despite immediate treatment with meloquine. After improvement of his consciousness, however, aphasia and quadriparesis persisted and brain MRI showed subacute infarction of both basal ganglia (globus pallidus and putamen). To our knowledge, this is the first case of cerebral malaria complicated with cerebral infarct reported in Korea.

SoMoBench: A benchmark dataset for soil moisture modeling with machine learning

Sungmin O,Sujeong Lim,Seon Ki Park 한국기상학회 2024 한국기상학회 학술대회 논문집 Vol.2024 No.4

Decoy Signal Based Strategic Beamforming Against High-Power Reactive Jamming

Lim, Sung-Ho,Han, Sungmin,Lee, Jaeseok,Eun, Yongsoon,Choi, Ji-Woong IEEE 2018 IEEE Transactions on Vehicular Technology VT Vol.67 No.10

<P>Array beamforming (BF) has received considerable attention as a means of anti-jamming by combining desired signals constructively and jamming signals destructively. However, even with BF, the state-of-the-art reactive jammer (RJ) can easily detect the target channels from the leakage of the transmit power and concentrate its own power to the detected band to degrade communication performance. In this paper, we attempt to mitigate this problem by exploiting fake information, the so-called decoy signal, and proper BF at the transmitter and the receiver, and show that it is possible to deceive the RJ into allocating a large portion of its own power to the decoy signal. In this regard, we attempt to maximize the signal-to-jamming-plus-noise power ratio (SJNR) at the receiver and the signal-to-leakage power ratio at the transmitter by optimizing the BF strategy. Through numerical simulations measuring the SJNR and the channel capacity, we demonstrate the effectiveness of the proposed BF scheme, especially in high-power RJ environments.</P>

Perfusion MRI for the prediction of treatment response after preoperative chemoradiotherapy in locally advanced rectal cancer.

Lim, Joon Seok,Kim, Daehong,Baek, Song-Ee,Myoung, Sungmin,Choi, Junjeong,Shin, Sang Joon,Kim, Myeong-Jin,Kim, Nam Kyu,Suh, Jinsuk,Kim, Ki Whang,Keum, Ki Chang Springer International 2012 EUROPEAN RADIOLOGY Vol.22 No.8

<P>To evaluate the utility of perfusion MRI as a potential biomarker for predicting response to chemoradiotherapy (CRT) in locally advanced rectal cancer.</P>

아동과 청소년의 일상적 스트레스에 관한 연구 동향: 2010-2020년 국내 학술지를 중심으로

박성민(Sungmin Park),임정하(JungHa Lim) 한국아동학회 2021 아동학회지 Vol.42 No.1

Objectives: This study examined current trends in the previous literature on daily stress among children and adolescents in Korea. Methods: A literature search from 2010 to 2020 was performed in two electronic databases provided by the National Assembly Library and Korea Education and Research Information Service. One hundred fifteen published articles meeting the inclusion criteria were analyzed. A systematic review was conducted to evaluate trends several publications, methodology including study designs, instruments as well as data analysis, and characteristics of relevant variables. Results: Studies on daily stress among children and adolescents were most frequently published in 2015. A large number of studies were conducted in social and natural sciences. Most of the studies collected data using the questionnaire method. Additionally, the self-report method was primarily used in studies involving adolescents, whereas the other-report was used in studies involving children. The number of studies targeting adolescents was higher than those targeting children. Regression and correlation analyses were most frequently used in quantitative data analyses. Most studies examined the associations between daily stress and emotional characteristics and psychological adjustment of children or adolescents and the effects of school-based intervention programs. Conclusion: This study will enhance our understanding of the current trends in daily stress research among children and adolescents. Incorporating a comprehensive model with various study designs, data collection methods, and developmentally appropriate measurement tools would strengthen future research in this area.