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Jiwan Kim,Hyunkyoo Choi,Jeonghoon Mo 한국과학기술정보연구원 2023 Journal of Information Science Theory and Practice Vol.11 No.1
The purpose of this study is to compare research trends in the information and communication technology (ICT) field between North and South Korea and analyze the differences by using data mining. Frequency analysis, clustering, and network analysis were performed using keywords from seven South Korean and two North Korean ICT academic journals published for five years (2015-2019). In the case of South Korea (S. Korea), the frequency of research on image processing and wireless communication was high at 16.7% and 16.3%, respectively. North Korea (N. Korea) had a high frequency of research, in the order of 18.2% for image processing, 16.9% for computer/Internet applications/security, and 16.4% for industrial technology. N. Korea’s natural language processing (NLP) sector was 11.9%, far higher than S. Korea’s 0.7 percent. Student education is a unique subject that is not clustered in S. Korea. In order to promote exchanges between the two Koreas in the ICT field, the following specific policies are proposed. Joint research will be easily possible in the image processing sector, with the highest research rate in both Koreas. Technical cooperation of medical images is required. If S. Korea’s high-quality image source is provided free of charge to N. Korea, research materials can be enriched. In the field of NLP, it calls for proposing exchanges such as holding a Korean language information conference, developing a Korean computer operating system. The field of student education encourages support for remote education contents and management know-how, as well as joint research on student remote evaluation.
Jiwan Kim(김지완),Jinseon Son(손진선),Jinhee Choi(최진희) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Human exposure to various environmental chemicals can enhance the risk for chronic diseases, such as reproductive malformation, and neurological and behavioral disorders, through epigenetic mechanisms. Histone modifications, one of the central epigenetic process, have been proposed as the toxic mechanism of various environmental chemicals due to its role in transcriptional regulation. In this study, we aimed to figure out the role of histone methylation in environmental chemicals-induced toxicity. To this end, adverse effects of the prevalent chemical additives in plastics (Bisphenol A, Di(2-erhylhexyl) phthalate, 3.3'-5.5'-Tetrabromobisphenol, Hexabromocyclododecane and Triclosan) on reproduction, locomotion and repressive histone methylation status were investigated in C. elegans. Then, we observed whether the adverse effects by chemicals were restored in combinational exposure with histone methyltransferase (HMT) or histone demethylase (HDM) inhibitors, which target to H3K9 and H3K27 methylation. Our results showed the higher toxicity of triclosan and 3.3'-5.5'-Tetrabromobisphenol than other chemicals and the increase in protein expression level of H3K9me3 and H3K27me3 with exposure to these two additives. Interestingly, the recovery of reproductive defects induced by two additives occurred following target HMT inhibitor exposure, suggesting that repressive histone modification surely can play a key role in adverse outcome of certain chemicals. To further understand epigenetically mediated toxic mechanism of the chemical exposure, reproduction and stress response-related gene expression analysis would be needed in the same manner of this study.
모션 효과의 파형 변조에 대한 사용자의 감성적/감정적 반응 조사
이지완(Jiwan Lee),정다운(Dawoon Jeong),한성호(Sung H. Han),최승문(Seungmoon Choi) 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2
모션 효과는 사용자의 몰입감 증강을 목표로 시청각 영상에 가미하는 감각 효과들 중 하나이다. 아직까지는 저작 시 모션의 파형이나 물리량으로부터 사용자가 받게 될 경험을 예측하는 것은 어려운 상황으로 저작자의 경험에 의존해 저작되고 있다. 본 논문은 모션 효과에 대한 세 파형변조 방법을 제안하고 변조 방법들에 대한 여러 감성적 및 감정적 느낌을 형용사 평가 실험으로 조사한다. 각 감성/감정적 느낌에 유의한 영향을 미치는 변조 방법들을 확인하였으며 모션 파형의 주파수 성분 조절에 따른 형용사 평가 점수 변화를 조사하였다. 또한 형용사마다 변조 정도에 따른 형용사 점수 변화 예측 회귀 모델을 보고하였다. 이 결과는 모션 효과 저작 시 보다 의미 있게 사용자경험을 유추하는데 이용될 수 있다.
이지완(Jiwan Lee),유용재(Yongjae Yoo),최승문(Seungmoon Choi) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
4D 는 시청각 영상에 모션(motion), 진동, 바람 등 물리적인 효과를 가미하는 기술을 의미한다. 본 논문에서는 주요 4D 효과 중 하나인 모션 효과에 필요한 전정 기초 연구를 수행하고자 요(yaw) 방향 회전 모션에 대한 절대 역치(absolute threshold)와 심리 측정 함수(psychometric function)를 구하였다. 모션 자극 생성에는 주파수가 0.5 Hz 인 사인파각가속도 개형을 이용하였으며, 인지 세기를 달리하기 위해 최대 각속도(peak velocity)를 조절하였다. 실험방법은 항상 자극법(method of constant stimuli)을 이용하였으며, 각 시도마다 피험자는 제시되는 모션자극을 받고 지각한 회전 방향으로 응답하였다. 심리 측정 함수는 프로빗 회귀 분석(probit analysis)을 이용하여 누적 정규 분포로 피팅하였다. 추정된 함수를 통해 구한 결과, 평균에 대한 절대 역치는 1.01°/, 표준 편차는 0.69°/으로 측정되었다. 본 심리 측정 함수로부터 요 방향 자극에 대한 모든 지각 확률의 자극 세기를 구할 수 있다.
High-performance polyketone nanocomposites achieved via plasma-assisted mechanochemistry
You, Jiwan,Choi, Han-Hyeong,Kim, Tae Ann,Park, Min,Ha, Jeong Sook,Lee, Sang-Soo,Park, Jong Hyuk Elsevier Applied Science Publishers 2019 Composites science and technology Vol.183 No.-
<P><B>Abstract</B></P> <P>Polyketone (PK) is an engineering plastic with excellent impact strength, chemical resistance, barrier properties, and flame retardancy. However, the development of PK nanocomposites with further improved properties obtained via compounding is challenging due to the poor compatibility between PK and nanofillers. Also, since PK is not soluble in common organic solvents, it is difficult to enhance the affinity between components by applying wet chemistry processes widely used to make other composites. Herein, we report an effective solution to improve the compatibility of PK and nanofillers via a completely dry process. The plasma-assisted mechanochemistry (PMC) process can form chemical bonds between polymers and nanofillers, thereby promoting the dispersion of the nanofillers in polymer composites. PK was compounded with graphite nanoplatelets (GNPs) using the PMC process, and the structure and properties of the composites were investigated. The composites displayed greatly improved mechanical and gas barrier properties, and thermal conductivity; compared with conventionally prepared composites having the same GNP content (10 wt%), the composites prepared via the PMC process had 9.7 times higher elongation at break (112.1%), 2.2 times higher impact strength (89.2 J/m), 2.2 times better barrier performance (0.9 g/m<SUP>2</SUP>·day), and 2.5 times higher thermal conductivity (1.6 and 13.9 W/mK in the through-plane and in-plane directions). This approach is an innovative route to high-performance polymer nanocomposites, even those constructed from insoluble and incompatible polymers such as PK.</P>