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Jungeun Lim,Jeein Choi,원아영,Minji Kim,김성민,윤창상 한국의류학회 2022 Fashion and Textiles Vol.9 No.1
To prepare measures for washing synthetic fbers, which cause proliferation of microplastics in the marine ecosystem, a fundamental analysis is required. Therefore, this study established an efcient method for quantitatively analyzing microfbers using artifcial neural networks, comparing the amounts of microfbers generated in the manufacturing, wearing, and washing processes of clothing. The proportion of microfber emitted during the manufacturing process was the largest (49%), followed by that emitted during the washing (28%) and wearing (23%) processes. This suggests that minimizing the amount of microfber emitted during the manufacturing process is key to solving microfber issues in the fashion industry. Additionally, during the wearing process, the amount of waterborne microfber detected in washing was slightly larger than the amount of airborne microfber. In the washing process, the washing temperature did not signifcantly afect microfber emissions. However, when reducing the amount of water used or increasing the number of washings, microfber emissions increased noticeably due to the greater friction applied to clothes. A common result of all experiments was that the largest proportion of microfbers was released during the frst fve washing cycles. Therefore, before wearing new items, consumers can minimize microfber release by pre-washing using a laundry bag that flters microfbers. Furthermore, the most efective way to minimize microfbers is to eliminate them from the manufacturing process before they are distributed to consumers
Design rules for a tunable merged-tip microneedle
Lim, Jungeun,Tahk, Dongha,Yu, James,Min, Dal-Hee,Jeon, Noo Li Nature Publishing Group UK 2018 Microsystems & nanoengineering Vol.4 No.-
<▼1><P>This publication proposes the use of an elasto-capillarity-driven self-assembly for fabricating a microscale merged-tip structure out of a variety of biocompatible UV-curable polymers for use as a microneedle platform. In addition, the novel merged-tip microstructure constitutes a new class of microneedles, which incorporates the convergence of biocompatible polymer micropillars, leading to the formation of a sharp tip and an open cavity capable of both liquid trapping and volume control. When combined with biocompatible photopolymer micropillar arrays fabricated with photolithography, elasto-capillarity-driven self-assembly provides a means for producing a complex microneedle-like structure without the use of micromolding or micromachining. This publication also explores and defines the design rules by which several fabrication aspects, such as micropillar dimensions, shapes, pattern array configurations, and materials, can be manipulated to produce a customizable microneedle array with controllable cavity volumes, fracture points, and merge profiles. In addition, the incorporation of a modular through-hole micropore membrane base was also investigated as a method for constitutive payload delivery and fluid-sampling functionalities. The flexibility and fabrication simplicity of the merged-tip microneedle platform holds promise in transdermal drug delivery applications.</P></▼1><▼2><P><B>Drug delivery: self-assembly of microneedles</B></P><P>The fabrication of merged-tip microneedles by elasto-capillarity-driven self-assembly is investigated in photocurable polymers, revealing design parameters for their potential use in drug delivery. Microneedles can be used for delivery of drug payloads by perforating the skin. However, existing needle fabrication processes typically rely on expensive approaches such as etching, embossing, and molding. Now, a team from Seoul National University led by Noo Li Jeon, explore design parameters for fabrication by elastic-capillary-driven self-assembly: photolithography is used to fabricate closely spaced polymer micropillars, the tips of which crosslink to form a microneedle. A number of microneedle geometries are studied, for different UV-curable polymers, suggesting the possibility of their use in drug delivery.</P></▼2>
3차원 세포 장벽의 동적의 미세환경을 구축하기 위한 다층구조 플랫폼 개발
임정은(Jungeun Lim),이형록(Stephen Rhee),전누리(Noo Li Jeon) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Cellular barrier layers play an important role in the body in regulating the diffusion between two microenvironments. Biological barriers such as the blood-brain barrier, blood-cerebrospinal fluid barrier, and the small intestine villi all utilize these epithelial barriers to control the diffusion of solutes into their system. This research describes a method to analyze the effects of microfluidic flow on cellular barriers through the use of a pumpless rocker. A barrier layer was recapitulated using brain epithelial cells cultured on a 3D-printed mesh platform, and a rocker system was used to induce microfluidic flow within the system. This study can provide insight into the mechanisms and effects of microfluidic flow on epithelial barriers for future studies.
任貞恩(Jungeun Lim),李在淵(Jaeyoun Yi),羅鍾範(Jong Beom Ra) 大韓電子工學會 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.6
이 논문은 동영상에서 의미 있는 객체를 추적하기 위해, 첫 번째 프레임에서 사용자가 관심 대상인 객체를 정의하고, 그 다음 프레임부터 자동으로 그 객체를 추적하는 반자동 기법을 제안한다. 제안한 객체 추적 알고리즘은 객체 경계 투영, 불확실 영역 추출, 경계 재조정 단계 등 모두 세 단계로 구성되며, 첫 단계에서는 움직임 추정을 통해 이전 프레임에서 현재 프레임우로 객체를 투영하고, 두 번째 단계는 투영한 결괴를 이용하여 윤곽선 부근에서 투영이 불확실한 영역을 MC 오류 및 색채 유사성 검사를 거쳐 추출하며, 마지막으로 투영이 불확실한 영역을 재조정함으로써 정확한 객체의 경제를 찾는다. 모의 실험을 통해 제안한 알고리즘이 기존의 반자동 알고리즘에 비해 다양한 영상에서 대해 만족할 만한 결과를 보임을 확인하였다. This paper describes an algorithm for semantic video object tracking using semi-automatic method. In the semi-automatic method, a user specifies an object of interest at the first frame and then the specified object is to be tracked in the remaining frames. The proposed algorithm consists of three steps: object boundary projection, uncertain area extraction, and boundary refinement. The object boundary is projected from the previous frame to the current frame using the motion estimation. And uncertain areas are extracted via two modules: MC error-test and color similarity test. Then, from extracted uncertain areas, the exact object boundary is obtained by boundary refinement. The simulation results show that the proposed video object extraction method provides efficient tracking results for various video sequences compared to the previous methods.