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Polymer brush: a promising grafting approach to scaffolds for tissue engineering
( Woonjung Kim ),( Jongjin Jung ) 생화학분자생물학회(구 한국생화학분자생물학회) 2016 BMB Reports Vol.49 No.12
Polymer brush is a soft material unit tethered covalently on the surface of scaffolds. It can induce functional and structural modification of a substrate`s properties. Such surface coating approach has attracted special attentions in the fields of stem cell biology, tissue engineering, and regenerative medicine due to facile fabrication, usability of various polymers, extracellular matrix (ECM)-like structural features, and in vivo stability. Here, we summarized polymer brush-based grafting approaches comparing self-assembled monolayer (SAM)-based coating method, in addition to physico-chemical characterization techniques for surfaces such as wettability, stiffness/ elasticity, roughness, and chemical composition that can affect cell adhesion, differentiation, and proliferation. We also reviewed recent advancements in cell biological applications of polymer brushes by focusing on stem cell differentiation and 3D supports/implants for tissue formation. Understanding cell behaviors on polymer brushes in the scale of nanometer length can contribute to systematic understandings of cellular responses at the interface of polymers and scaffolds and their simultaneous effects on cell behaviors for promising platform designs. [BMB Reports 2016; 49(12): 655-661]
Kim, Woonjung,Bae, Jihyun,Eum, Chul Hun,Jung, Jongjin,Lee, Seungho Elsevier 2018 Microchemical journal Vol.142 No.-
<P><B>Abstract</B></P> <P>Carbon black (CB) has excellent chemical and physical properties including strong chemical strength and electrical conductivity. CB is widely used in various industries such as semiconductor, tire, rubber, ink, paint, toner and resin. When used in ink, as the CB particle size and the size distribution become smaller and narrower, respectively, they tend to be better dispersed, and the glossiness and stability of the ink increases.</P> <P>In the present study, asymmetrical flow field-flow fractionation (AsFlFFF) was employed to analyze the size distribution of CB particles used in ink. CB suspensions were prepared by dispersing CB powder in aqueous media containing copolymeric dispersing agents of hydrophobic (styrene) and hydrophilic (acrylic or maleic acid) monomers. Experimental parameters of AsFlFFF were optimized for analysis of the CB particles.</P> <P>Although the mean sizes obtained by AsFlFFF and dynamic light scattering (DLS) were in good agreements for those with narrow size distributions, DLS failed to distinguish among the CB suspensions having broad size distributions, whereas AsFlFFF differentiated them easily. Results indicated that the CB particles were dispersed better with copolymeric dispersing agents having an aromatic polymer with OH functionality than those with COOH functionality. It was also observed that, as the mean size of the CB particles decreases and the size distribution becomes narrower, the ink become thermally more stable.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aromatic polymers having high thermal stability were synthesized for surface modification of carbon black (CB) particles. </LI> <LI> Asymmetric flow field-flow fractionation (AF4) was employed for characterization of surface modified CB particles. </LI> <LI> DLS failed to distinguish CB suspensions having broad size distributions, whereas AsFlFFF was able to differentiate. </LI> <LI> CB particles were dispersed better with dispersing agents with OH functionality than those with COOH. </LI> </UL> </P>
조운정(Woonjung Cho),현주하(Juha Hyun),김수현(Soohyun Kim),엄기민(Kimin Eom),한광희(Kwanghee Han) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2
Colors convey emotions and feelings. This study investigated human's emotional responses on both single colors and changes of colors in clothing. From experiment 1, we found that the important possibility that color emotion also can apply on photonic clothing and it can play a significant role in expressing emotions. We also found there are differences in emotional dimensions between web colors and photonic colors. 스마트 의류는 각종 디지털 기기나 기능을 의복에 통합시킨 차세대 의류이며, 그 중 포토닉(photonic) 의류는 광섬유를 이용해 옷의 색을 변화시킬 수 있어 다양한 개성표현이 가능한 복종이다. 본 연구는 기존 색 관련 연구들이 의류라는 맥락과 광섬유라는 새로운 소재에 그대로 적용될 수 있는지에 대해 다루고 있다. 실험 1 을 통하여 옷의 색과 색 변화를 통해 정서 전달과 표현의 가능성을 검증하였으며, 형용사 이미지 척도를 사용한 실험 2 를 통해 포토닉 의류가 기존의 웹 컬러와 다른 감성의 차원을 가질 수 있음을 밝혔다.
옐로우가든: 가드닝 체험을 위한 뉴미디어 콘텐츠 디자인
장운정(Woonjung Jang),엄혜경(Hye Kyoung Eum),유원(Won Yoo),장미(Mee Chang),권두영(Doo Young Kwon) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
급격한 도시화로 주변에 자연이 없어지는 요즘 간접적으로나마 자연을 느끼기 위해 가상공간에서 동식물을 키우며 가꾸는 콘텐츠들이 증가하고 있다. 엘로우가든은 현실에서 식물을 접하고 기르기 어려운 현대인들에게 실제공간과 가상공간의 연계를 통해 가드닝 활동을 제안하는 뉴미디어 콘텐츠다. 옐로우가든은 활동을 제안하는 뉴미디어 콘텐츠다. 옐로우가든은 실제공간과 가상공간의 연계를 통해 사용자의 경험을 창출하고 동시에 사용자에게 의미있는 경험을 제공하기 위한 전시시스템이다. 본 시스템을 통해 사용자들은 혼자 혹은 여럿이 자신의 신체를 활용하여 경험을 하게 되고 감성적이고 동시에 교육적인 경험도 가져가게 된다. In the midst of sudden urbanization, nature is disappearing. In order to feel the nature indirectly, growing animals and plants in virtual space are increasing. The Yellow Garden is a new media content that suggests gardening activities by linking real space and virtual space for the modern people who are hard to reach plants in reality. Yellow garden is a display system that creates a user experience real space and virtual space, and at the same time provides a meaningful experience to users. Users can experience by using their own body. By combining alone or together with others it also brings educational experience as well as emotional experience.
차운정 ( Woonjung Cha ),안현옥 ( Hyunok Ahn ),김형준 ( Hyungjoon Kim ) 사단법인 아시아문화학술원 2020 인문사회 21 Vol.11 No.6
본 연구의 목적은 성인학습자의 원격학습 참여와 원격기술을 통한 학습 성과를 증진시키기 위한 효과적인 교육전략을 논의하는데 있다. 본 논문의 연구방법은 문헌분석 방법이며, 연구결과는 다음과 같다. 첫째, 학습자 중심의 원격교육 환경조성이 필요하다. 둘째, 원격 성인학습자들이 자기주도적 학습능력을 발휘하여야 한다. 셋째, 학습 유형 차원에서는 혼합학습(blended learning)이 더욱 바람직하며, 학습 전략적 차원에서는 성인학습자의 다양한 차이에 따른 학습전략을 세우는 것이 중요하고, 학습자와 소통하고 학습문제가 발견되었을 때는 즉각적으로 피드백을 제공하여 해결해야 한다. The purpose of this study is to discuss effective educational strategies to promote adult learner’s participation in remote learning and their learning performance through remote technology. The method of research in this paper is the method of literature analysis, and the results of the study are as follows. First, it is necessary to create a learner-centered remote education environment. Second, remote adult learners should exercise self-directed learning ability. Third, at the learning type level, blended learning is more desirable, and at the learning strategy level, it is important to establish a learning strategy based on the various differences of adult learners, and when learning problems are found, it should be resolved by communicating with learners and providing immediate feedback.
조운정(WoonJung Cho),안원미(Wonmi Ahn),박지예(Jeeyea Park),김명식(Myoung Shik Kim),한광희(Kwang-Hee Han) 한국HCI학회 2011 한국HCI학회 학술대회 Vol.2011 No.1
최근 들어서 다양한 주변 상황의 변화에 따라 최적으로 위장할 수 있는 위장패턴을 찾아내는 것이 중요하게 부각되고 있다. 이에 본 연구는 환경의 복잡도에 따라 제안하는 위장 패턴의 효과성을 비교하였다. 연구 방식은 배경 이미지에서 위장 타깃을 찾는 방식으로 포토시뮬레이션 기법을 통해 연구실 환경에서 진행되었다. 그 결과, 복잡도에 따라 위장 패턴의 효과가 달라짐을 확인하였다. 우선 기존의 위장 패턴보다 제안하는 2 가지 위장 패턴의 위장성이 높았으며, 환경의 복잡도에 따라 위장 패턴들의 탐색 시간이 유의미하게 높아짐을 확인하였다. 이는 추후 패턴 개발에서 환경의 복잡도가 주요 고려 요소임을 지지하는 연구결과이다. 즉 주위 환경의 조건변화에 따라 위장성 차이가 존재하므로, 전투맥락 및 환경변화의 영향에 대한 고려가 위장패턴 개발 단계에서부터 요구된다. The recent trend in camouflage research emphasizes the need to find the optimal adaptive camouflage pattern in dynamic circumstances of various real environment conditions. Our research compared the effectiveness of camouflage patterns according to the environmental complexity. Participants in the lab experiment were asked to perform the visual search tasks using a photo simulation and then to find camouflaged targets. The resulting effect of camouflage patterns varied in accordance with image complexity. Two of the newly developed patterns that are proposed had predominant camouflage abilities than the previous pattern. Analytical search time was significantly longer with the complexity of the background environment. The results support that environmental complexity is a major concern for designing future patterns. Since there is a camouflage ability difference with the change of the environment, the consideration of battle context and effect of the environment change should be required in the stage of developing camouflage pattern.