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김지엽 ( Jiyeop Kim ),홍정구 ( Jung Goo Hong ) 한국분무공학회지 2020 한국액체미립화학회지 Vol.25 No.2
Electrospray is used in various industries because it can produce continuous and uniform droplets. However, it is difficult to find optimal spraying condition due to lack of data in various conditions. In this study, various conditions were divided into electric parameters and fluid property. The electric parameters set Nozzle to Substrate(NTS), nozzle diameters and the fluid property set viscosity and conductivity as conditions. In this study, it observes spray patterns, Sauter Mean Diameter( SMD) according to conditions. As a result, fluid properties had a greater effect on the cone-Jet mode than on the nozzle diameter, NTS, and flowrate. All of solutions have Stable cone-jet mode at voltage of 8.5 kV, NTS of 20 mm and nozzle diameter of 0.2 mm. SMD has 27% different depending on viscosity and conductivity. The increased flowrate and viscosity are rising break-up length and thickening jet also jet is thinned by increased conductivity. Experiments have confirmed that the jet is thickened by increased flowrate and viscosity, and that the jet is thinned by conductivity.
단순직선 모서리형 툴의 수평 이송 기판 상 고주기 진동압입 기반 연속적 나노패턴 생산 시스템 개발
김지엽(Jiyeop Kim),이윤규(Youn Kyu Lee),지강민(Kang Min Jee),이승조(Seungjo Lee),문승규(Seung Kyu Moon),옥종걸(Jong G. Ok) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.3
We developed a continuous nanopattern manufacturing system that realizes a high-frequency vibrational indentation of a simple flat-edge rigid tool onto a horizontal-feeding polymer substrate with computer-based control. We first designed a process principle and its implementation modules, and subsequently constructed a system prototype. By controlling the tool vibration frequency and indenting force as well as the substrate feeding speed and stroke direction, we can create diverse nanopatterns with various periods and shapes including periodtunable nanogratings and multidimensional nanostructures. Such manufactured nanopatterns may be utilized in many potential applications involving precision machinery components, displays and light sources, sensors and actuators, and flexible electronics and photonics, all of which require tunable periods and shapes.
김준영,손기영,이지엽,Kim Junyoung,Son Kiyoung,Lee Jiyeop 한국건설안전학회 2023 한국건설안전학회 논문집 Vol.5 No.1
The Serious Disaster Punishment Act, which has been in effect since January 27, 2022, requires employers or management managers who neglect safety measures to be punished by imprisonment for more than one year in the event of a serious disaster. As this Act on the Punishment of Severe Disasters came into effect this year, it has received a lot of attention from society. According to experts, most of the opinions are that the bill was created focusing on increasing punishment for companies, contrary to the original purpose of the bill to reduce the safety accident rate. This study confirmed whether these contents were true through case studies, and if this continues, the conflict between companies and workers will intensify and the safety accident rate will not decrease. Therefore, this study does not unconditionally increase corporate punishment, but compares many situations through surveys and suggests a way for companies and workers to cooperate with the Critical Accident Punishment Act to reduce the safety accident rate.
Lee Jae Hyuk,Na Minho,Kim Jiyeop,유강은,Park Jaekyu,Kim Jeong Dae,Oh Dong Kyo,이승조,윤홍석,Kwak Moon Kyu,옥종걸 나노기술연구협의회 2017 Nano Convergence Vol.4 No.11
We present a facile and scalable coating method based on controlled airbrushing, which is suitable for conformal resin coating in continuous roll-to-roll (R2R) nanoimprint lithography (NIL) process. By controlling the concentration of UV-curable polymeric resin with mixing the volatile solvent and its airbrushing time, the coated resin film thickness can be readily tuned. After R2R NIL using a flexible nanoscale line pattern (nanograting) mold is conducted upon the airbrushed resin film, a large-area uniform nanograting pattern is fabricated with controlled residual layer thickness (RLT) based on the initial film thickness. We investigate the faithful airbrushing condition that can reliably create the uniform thin films as well as various nanopatterns with controlled morphologies. Using more diluted resin and shorter airbrushing time can reduce the RLTs favourably for many applications, yet is apt to induce the nanoscale pores and discontinued lines. We also discuss how to further improve the quality and scalability of resin airbrushing and its potential applications particularly requiring high-speed and conformal coating on highly topographic and flexible surfaces.