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자가 치유 캡슐 제작을 위한 off-chip 방식의 드랍렛 제작 기술
지동민 ( Ji Dong-min ),송원일 ( Song Won-il ),이자성 ( Lee Ja-sung ),아르만도 ( Ramos-sebastian Armando ),박세진 ( Park Se-jin ),최건 ( Choi Geon ),김성훈 ( Kim Sung-hoon ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
The microfluidic controlled droplet production system is one of the most powerful methods for capsule manufacturing. However, stable production is not possible when the powder is included. We solved the above problem by developing an off-chip droplet production system. we checked the droplet creation mechanism and created a simple repair model. It was possible to produce a uniform and stable droplet regardless of the powder content.
미세 유체제어 방식 드랍렛 제작 기술을 이용한 자가치유 캡슐 제작 및 특성 분석
지동민 ( Ji Dong-min ),송원일 ( Song Won-il ),이자성 ( Lee Ja Sung ),아르만도 ( Ramos-sebastian Armando ),김성훈 ( Kim S-hoon ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
The microfluidic controlled droplet manufacturing system is one of the most powerful methods for capsule manufacturing. The microfluidic control method can control the type and size of the capsule by changing the size and configuration of the channel. In addition, by increasing the number of channels, capsules of uniform size can be mass-produced. In this paper, a capsule manufacturing system including flow-focusing and T junction method was designed. In addition, the effectiveness of this system was verified by manufacturing multi-emulsion capsules with a size of 2.2 to 3 mm.
Dongxi Zheng,지동민(Dong Min Ji),김성훈(Sung Hoon Kim) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
Hydrogel is a three-dimensional network structure with good biocompatibility, many of which are biodegradable and non-toxic. Therefore, hydrogels are widely used in environmental engineering, biomedicine, and other fields. Smart hydrogel is a kind of hydrogel that can respond to external stimuli. According to the stimulus-response type, smart hydrogels can be divided into thermal, pH, electric field, magnetic field response smart hydrogels. Magnetically responsive smart hydrogel, which has fast response, little harm to the human body, and remote control, can be used in biomedical fields, such as targeted drug delivery, assisted diagnosis, tissue engineering, and magnetic hyperthermia. This article introduces the fabrication methods and application fields of magnetic hydrogels. In particular, we discussed the characteristics, applications, and future research prospects of self-responsive smart hydrogel micro/nanorobots.
송원일 ( Song Won-il ),아르만도 ( Ramos-sebastian Armando ),이자성 ( Lee Ja-sung ),지동민 ( Ji Dong-min ),박세진 ( Park Se-jin ),최건 ( Choi Geon ),김성훈 ( Kim Sung-hoon ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
Typically, the methods of crack detection on concrete structures include some problems, such as a low accuracy and expensive. To solve these problems, we proposed a neural network-based crack search method. The proposed algorithm goes through three convolutions and is classified into crack and non-crack through the softmax layer. As a result of the performance evaluation, cracks can be detected with an accuracy of 99.4 and 99.34 % at the training model and the validation model, respectively.
코팅재 종류에 따른 PCC(Powder Compacted Capsule) 혼입 모르타르의 유동성 및 강도 특성
이재인 ( Lee Jae-in ),김채영 ( Kim Chae-young ),박정연 ( Park Jeong-yeon ),지동민 ( Ji Dong-min ),김성훈 ( Kim Sung-hoon ),최세진 ( Choi Se-jin ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
As part of a study to alleviate problems caused by cracks in concrete structures, this study compares and analyzes the fluidity and strength characteristics of mortars used by adjusting the mixing ratio of two types of PCC(Powder Compacted Capsule) manufactured by different methods.
캡슐 구조 설계를 통한 등방성 FDM 3D 프린팅 자가치유 캡슐의 제작 및 분석
송원일 ( Song Won-il ),아르만도 ( Ramos-sebastian Armando ),이자성 ( Lee Ja-sung ),지동민 ( Ji Dong-min ),김성훈 ( Kim Sung-hoon ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
PLA 3D printed capsule of FDM method has advantages of mass production and low cost. However, it has a different strength depending on the direction in witch it is laminated. In this paper, structural design of several capsules, FEM analysis, and Compressive strength tests were conducted. As a result, the proposed capsule has a strong load of up to 217.9% compared to general capsule without a reinforcing structure.