http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
표면-줄기세포 증식 관계 확인을 위한 마이크로 구조표면을 포함한 멀티웰 플랫폼 제작
안성아(Seonga An),최동휘(Dongwhi Choi),임지원(Jiwon Lim),김동성(Dong Sung Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Micro-scale topography fabrication have attracted much attention in biomedical engineering because of their potential for stem cell proliferation enhancement effect. In recent years, adult stem cells (ASCs) are proved as versatile troubleshooter in biomedical and pharmaceutical field. However, ASCs take up only a small proportion of somatic cells in human body and the study of enhancing the proliferation rate of ASCs became essential in modern society. Researchers suggested the use of topographic stimuli as solution for this problem. Numerous researches were executed to clarify the relationship of topography and ASCs proliferation but there are still difficulties in defining tendency to clearly deduce an optimal topography for enhancing proliferation rate due to an intervention of other factors. To overcome this weakness we propose a multi-well cell culture platform that allows simple way of screening effects of various kinds of topography on ASCs. In this study we fabricated multi-well cell culture platform containing micro-scale topography and carried out experiments of human Adipose derived Stem Cells (hASCs) proliferation. Through this experiment we verify the multi-well cell culture platform’s functionality then we expect that this multi-well cell culture platform system would contribute to finding optimal topography for enhancing ASCs proliferation rate.
마찰대전 나노발전기의 출력 및 안정성 향상을 위한 일렉트렛 개발
감동익 ( Dongik Kam ),장순민 ( Sunmin Jang ),윤영철 ( Yeongcheol Yun ),배홍은 ( Hongeun Bae ),이영진 ( Youngjin Lee ),라윤상 ( Yoonsang Ra ),조수민 ( Sumin Cho ),서경덕 ( Kyoung Duck Seo ),차경제 ( Kyoung Je Cha ),최동휘 ( Dongwhi 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.1
With the rapid development of ultra-small and wearable device technology, continuous electricity supply without spatiotemporal limitations for driving electronic devices is required. Accordingly, Triboelectric nanogenerator (TENG), which utilizes static electricity generated by the contact and separation of two different materials, is being used as a means of effectively harvesting various types of energy dispersed without complex processes and designs due to its simple principle. However, to apply the TENG to real life, it is necessary to increase the electrical output. In addition, stable generation of electrical output, as well as increase in electrical output, is a task to be solved for the commercialization of TENG. In this study, we proposed a method to not only improve the output of TENG but also to stably represent the improved output. This was solved by using the contact layer, which is one of the components of TENG, as an electret for improved output and stability. The utilized electret was manufactured by sequentially performing corona charging-thermal annealing-corona charging on the Fluorinated ethylene propylene (FEP) film. Electric charges artificially injected due to corona charging enter a deep trap through the thermal annealing, so an electret that minimizes charge escape was fabricated and used in TENG. The output performance of the manufactured electret was verified by measuring the voltage output of the TENG in vertical contact separation mode, and the electret treated to the corona charging showed an output voltage 12 times higher than that of the pristine FEP film. The time and humidity stability of the electret was confirmed by measuring the output voltage of the TENG after exposing the electret to a general external environment and extreme humidity environment. In addition, it was shown that it can be applied to real-life by operating the LED by applying an electret to the clap-TENG with the motif of clap.
사용자 환경 모니터링을 위한 소형 자가발전 무선 데이터 송수신 시스템 개발
장순민 ( Sunmin Jang ),조수민 ( Sumin Cho ),정윤수 ( Yoonsu Joung ),김재형 ( Jaehyoung Kim ),김현수 ( Hyeonsu Kim ),장다연 ( Dayeon Jang ),라윤상 ( Yoonsang Ra ),이동한 ( Donghan Lee ),라문우 ( Moonwoo La ),최동휘 ( Dongwhi Choi ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.2
With the rapid advance of the semiconductor and Information and communication technologies, remote environment monitoring technology, which can detect and analyze surrounding environmental conditions with various types of sensors and wireless communication technologies, is also drawing attention. However, since the conventional remote environmental monitoring systems require external power supplies, it causes time and space limitations on comfortable usage. In this study, we proposed the concept of the self-powered remote environmental monitoring system by supplying the power with the levitation-electromagnetic generator (L-EMG), which is rationally designed to effectively harvest biomechanical energy in consideration of the mechanical characteristics of biomechanical energy. In this regard, the proposed L-EMG is designed to effectively respond to the external vibration with the movable center magnet considering the mechanical characteristics of the biomechanical energy, such as relatively low-frequency and high amplitude of vibration. Hence the L-EMG based on the fragile force equilibrium can generate high-quality electrical energy to supply power. Additionally, the environmental detective sensor and wireless transmission module are composed of the micro control unit (MCU) to minimize the required power for electronic device operation by applying the sleep mode, resulting in the extension of operation time. Finally, in order to maximize user convenience, a mobile phone application was built to enable easy monitoring of the surrounding environment. Thus, the proposed concept not only verifies the possibility of establishing the self-powered remote environmental monitoring system using biomechanical energy but further suggests a design guideline.