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서준영 ( Joonyoung Seo ),고동완 ( Dongwan Ko ),최준석 ( Junseck Choi ),노재하 ( Jaeha Noh ),정정열 ( Jung-yeul Jung ),이문진 ( Moonjin Lee ),이상태 ( Sangtae Lee ),장지호 ( Jiho Chang ) 한국센서학회 2020 센서학회지 Vol.29 No.1
An integrated multifunctional sensor, capable of raising an early electric-fire warning, was fabricated. An arc-light, temperature, and humidity sensor was fabricated on a flexible substrate using a printed thin film of indium tin oxide. A polyethylene terephthalate (PET) substrate was used as the flexible substrate. The sensor was fabricated on a PET substrate, and its operating characteristics were tested. The operating performances of the sensor when serving as an arc-light, a temperature, and a humidity sensor were estimated to be 0.6247 Ω/W, 80.6 Ω/K, and -4.08 Ω/RH, respectively. The feasibility of the proposed fire sensor was demonstrated; it costs low and offers multiple functionalities
Multi-Walled Carbon Nanotubes (MWCNT) 인쇄박막의 제작과 화학센서 동작 특성에 관한 연구
노재하,최준석,고동완,서준영,이상태,정정열,장지호,Noh, Jae Ha,Choi, Junseck,Ko, Dongwan,Seo, Joonyoung,Lee, Sangtae,Jung, Jung-Yeul,Chang, Jiho 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.3
Hazardous and noxious substance (HNS) detection sensors were fabricated using multi-walled carbon nanotubes (MWCNTs) and various binder materials for ion batteries. To obtain uniformly printed films, the printing precision according to the substrate cleaning method was monitored, and the printing paste mixing ratio was investigated. Binders were prepared using styrene butadiene rubber + carboxymethyl cellulose (SBR+CMC), polyvinylidene fluoride + n-methyl-2-pyrrolidene (PVDF+NMP), and mixed with MWCNTs. The surface morphology of the printed films was examined using an optical microscope and a scanning electron microscope, and their electrical properties are investigated using an I-V sourcemeter. Finally, sensing properties of MWCNT printed films were measured according to changes in the concentration of the chemical under the various applied voltages. In conclusion, the MWCNT printed films made of (SBR+CMC) were found to be feasible for application to the detection of hazardous and noxious chemicals spilled in seawater.
폴리아세탈의 입자유동베드 가공에서 회전속도와 공기 유량이 재료제거 특성에 미치는 영향
장양제(Yangjae Jang),김태경(Taekyoung Kim),황현덕(Heondeok Hwang),서준영(Joonyoung Seo),이다솔(Dasol Lee),이현섭(Hyunseop Lee) 한국트라이볼로지학회 2017 한국윤활학회지(윤활학회지) Vol.33 No.5
Abrasive fluidized bed machining (AFBM) is similar to general abrasive fluidized machining (AFM) in that it can perform polishing of the outer and inner surfaces of a 3-dimensional shape by the flow of particles. However, in the case of AFM, the shear force generated by the flow of the particles causes material removal, while in AFBM, the abrasive particles are suspended in the chamber to form a bed. AFBM can be used for deburring, polishing, edge contouring, shot peening, and cleaning of mechanical parts. Most studies on AFBM are limited to metals, and research on application of AFBM to plastic materials has not been performed yet. Therefore, in this study, we investigate the effect of rotating speed of the specimen and the air flow rate on the material removal characteristics during AFBM of polyacetal with a horizontal AFBM machine. The material removal rate (MRR) increases linearly with increase of the rotating speed of the main shaft because of the shear force between the particles of the fluidized bed and the rotation of the workpiece. The reduction in surface roughness tends to increase as the rotating speed of the main shaft increases. As the air flow rate increases, the MRR tends to decrease. At a flow rate of 70 L/min or more, the MRR remains almost constant. The reduction of the surface roughness of the specimen is found to decrease with increasing air flow rate.