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안병철(Byeung-Cheol An),함영복(Young-Bog Ham),Mojiz Abbas Trimzi,이기태(Gi-Tae Lee),박중호(Jung-Ho Park),윤소남(So-Nam Yun) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The piezoelectric valve, which is one of the fastest actuated valve in existence, has been used. To make more various application of jet injection device, high pressure is essentially needed. But the high momentum jet injection is accompanied with a lot of injection volume inevitably. Various nozzles are used to make high pressure at the same other conditions. The valve driver was also fabricated for elaborately manipulating it. We confirmed what kind of parameter can affect volume and force. Based on this experiment, it is known how to decrease the volume and increase the force and we will be able to find optimized value when we have a object to be injected.
네이버 기사 크롤링을 활용한 액체/액화수소 키워드 분석
안병철(Byeung-Cheol An),함영복(Young-Bog Ham),모지즈(Mojiz Abbas Trimzi),윤소남(So-Nam Yun),박중호(Jung-Ho Park),채영훈(Yeonghun Chae) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Recently, interest in liquid/liquified hydrogen is increasing as a way to transport, storage, utilize hydrogen as part of the hydrogen economy activation roadmap and K-New Deal policy. However, in Korea, liquid hydrogen and liquified hydrogen are mixed, so it is necessary to establish a term. Naver articles from 2001 to 2019 were crawled with digital text required for quantitative text mining. Titles of crawled articles were tokenized by Mecab, and tokenized keywords were visualized in Ranking Index and Word Cloud. In this paper, we confirmed that there was a rapid change as of 2015, and we were able to confirm the different research trends of liquid/liquified hydrogen.
함영복(Young-Bog Ham),안병철(Byeung-Cheol An),Mojiz Abbas Trimzi,김종대(Jong-Dae Kim),이기태(Gi-Tae Lee),박중호(Jung-Ho park),윤소남(So-Nam Yun) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.10
마이크로 인젝션을 바이오분야에 적용하기 위해 고압생성을 통해 침투하는 방법을 채택하였다. 그러나 고압의 액체를 인젝션 할 경우 그 양을 미세하게 하기 어렵다. 이러한 문제를 해결하기 위해는 고속으로 동작하는 개폐밸브에 의한 방법이 있다. 본 연구에서는 수백 Hz로 동작가능한 압전 액추에이터로 구성된 개폐밸브를 적용하여 실험하였다. 압전밸브를 구동하는 파형을 다양하게 조절하고 노즐의 구조에 의한 영향을 알아보기 위해 5가지 서로 다른 치수의 노즐을 제작하였다. 다양한 노즐과 구동파형 변수를 조절하면서 무엇이 인젝션 볼륨과 인젝션 힘에 큰 영향을 미치는지 확인하였다. 이 실험을 통해, 인젝션 볼륨을 줄이고 인젝션 힘을 증가시키는 방법을 알아냈고 목표치가 있다면 그에 맞는 다양한 값을 결정할 수 있게 되었다. It is essential for micro jet injectors in the biomedical sector to operate under high pressure. High pressure injection, however, is accompanied by high volumes. On/Off valves that can be operated at high speeds have been used to address this problem. In this research, piezoelectric actuators which have a response frequency of the order of hundreds of kilohertz were used as the On/Off valve and experiments were applied. Researchers developed a controller to precisely manipulate the piezoelectric valve with various waveforms. They also fabricated five types of nozzles to consider the effect of nozzle type on injection. This allowed researchers to manipulate and confirm factors that can affect the injection volume and force. Results of this experiment have shown how to decrease the injection volume and increase the injection force. and it is predicted that the optimized injection volume and force value can be determined depending on the skin type.