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박다희(Dahee Park),성의숙(Eui-Suk Sung) 대한신경모니터링학회 2022 Journal of Neuromonitoring & Neurophysiology Vol.2 No.2
Thyroid surgery can cause many complications, but recurrent laryngeal nerve palsy is the most important. Therefore, many efforts have been tried to avoid recurrent laryngeal nerve palsy. Among them, intraoperative neuromonitoring (IONM) is one of the useful tools to find nerves and avoid nerve palsy during surgery. There are various methods, but the method of directly monitoring the movement of the vocal cords using an electromyography tube was introduced first. After that, a method of increasing the signal accuracy by using a pressure sensor and an accelerometer sensor was also introduced. In addition, a needle is directly pierced into the thyroid cartilage or an electrical signal is measured by attaching a sensor to the skin in front of the thyroid cartilage. Various methods of IONM are being tried and studied, and efforts to help find nerves through IONM are continuing. It is expected that overall surgical complications will be reduced by preserving nerves, avoiding changes in voice and swallowing disorders, and reducing the need for tracheostomy due to bilateral vocal cord palsy.
Fabrication of Fe Foam using Slurry Coating Process
윤중열,박다희,양상선,왕제필,Yun, Jung-Yeul,Park, Dahee,Yang, Sangsun,Wang, Jei-Pil The Korean Institute of Resources Recycling 2017 資源 리싸이클링 Vol.26 No.6
메탈폼은 매우 많은 기공을 포함하는 세포상 구조를 갖는 고체금속을 일컫는다. 특히 관통 기공 같은 개기공들은 고온용 필터 및 촉매 지지체 등으로 산업적으로 많이 사용되고 있다. 본 연구에서는 슬러리 코팅공정으로 90% 이상의 기공율과 2 mm 이상의 기공크기를 갖는 Fe 폼을 제조하였다. 이때 Fe 분말과 $Fe_2O_3$ 분말의 혼합비를 달리하여 기공율과 기공크기를 제어하였다. 이를 위해 우선 분말, 증류수 및 폴리비닐알콜(PVA)를 균일하게 혼합하여 슬러리를 제조하였다. $Fe_2O_3$ 분말의 혼합 비율이 증가할수록 PU 폼에 코팅된 슬러리의 양이 증가한 반면 Fe 폼의 수축 및 기공율은 각각 감소하였다. Metal foams have a cellular structure consisting of a solid metal containing a large volume fraction of pores. In particular, open pores which are penetrable pores are necessary for industrial applications such as in high temperature filters and as support for catalysts. In this study, Fe foam with greater than 90% porosity and 2-mm pore size was successfully fabricated using a slurry coating process and the pore properties were characterized. The Fe and $Fe_2O_3$ powder mixing ratios were controlled to produce Fe foam samples with different pore sizes and porosity. First, the slurry was prepared through the uniform mixing of powders, distilled water, and polyvinyl alcohol(PVA). The amount of slurry coated with the PU foam increased with increasing $Fe_2O_3$ mixing powder ratio, but the shrinkage and porosity of the Fe foams decreased, respectively, with increasing $Fe_2O_3$ mixing powder ratio.
소결 온도와 유지 시간에 따른 Fe-Cr-Al 다공성 금속의 제조
구본욱,이수인,박다희,윤중열,김병기,Koo, Bon-Uk,Lee, Su-In,Park, Dahee,Yun, Jung-Yeul,Kim, Byoung-Kee 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.2
The porous metals are known as relatively excellent characteristic such as large surface area, light, lower heat capacity, high toughness and permeability. The Fe-Cr-Al alloys have high corrosion resistance, heat resistance and chemical stability for high temperature applications. And then many researches are developed the Fe-Cr-Al porous metals for exhaust gas filter, hydrogen reformer catalyst support and chemical filter. In this study, the Fe-Cr-Al porous metals are developed with Fe-22Cr-6Al(wt) powder using powder compaction method. The mean size of Fe-22Cr-6Al(wt) powders is about $42.69{\mu}m$. In order to control pore size and porosity, Fe-Cr-Al powders are sintered at $1200{\sim}1450^{\circ}C$ and different sintering maintenance as 1~4 hours. The powders are pressed on disk shapes of 3 mm thickness using uniaxial press machine and sintered in high vacuum condition. The pore properties are evaluated using capillary flow porometer. As sintering temperature increased, relative density is increased from 73% to 96% and porosity, pore size are decreased from 27 to 3.3%, from 3.1 to $1.8{\mu}m$ respectively. When the sintering time is increased, the relative density is also increased from 76.5% to 84.7% and porosity, pore size are decreased from 23.5% to 15.3%, from 2.7 to $2.08{\mu}m$ respectively.
슬러리 코팅 공정으로 제조된 Fe 폼의 기공 특성에 미치는 Fe 및 Fe<sub>2</sub>O<sub>3</sub> 분말의 혼합 비율의 영향
최진호,정은미,박다희,양상선,한유동,윤중열,Choi, Jin Ho,Jeong, Eun-Mi,Park, Dahee,Yang, Sangsun,Hahn, Yoo-Dong,Yun, Jung-Yeul 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.4
Metal foams have a cellular structure consisting of a solid metal containing a large volume fraction of pores. In particular, open, penetrating pores are necessary for industrial applications such as in high temperature filters and as a support for catalysts. In this study, Fe foam with above 90% porosity and 2 millimeter pore size was successfully fabricated by a slurry coating process and the pore properties were characterized. The Fe and $Fe_2O_3$ powder mixing ratios were controlled to produce Fe foams with different pore size and porosity. First, the slurry was prepared by uniform mixing with powders, distilled water and polyvinyl alcohol(PVA). After slurry coating on the polyurethane(PU) foam, the sample was dried at $80^{\circ}C$. The PVA and PU foams were then removed by heating at $700^{\circ}C$ for 3 hours. The debinded samples were subsequently sintered at $1250^{\circ}C$ with a holding time of 3 hours under hydrogen atmosphere. The three dimensional geometries of the obtained Fe foams with an open cell structure were investigated using X-ray micro CT(computed tomography) as well as the pore morphology, size and phase. The coated amount of slurry on the PU foam were increased with $Fe_2O_3$ mixing powder ratio but the shrinkage and porosity of Fe foams were decreased with $Fe_2O_3$ mixing powder ratio.
대면적 Fecralloy 코팅층의 표면 거침도 극대화를 위한 정전분무 및 열처리 공정 연구
이혜문,구혜영,양상선,박다희,정수호,윤중열,Lee, Hye Moon,Koo, Hye Young,Yang, Sangsun,Park, Dahee,Jung, Sooho,Yun, Jung-Yeul 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.1
Fecralloy coating layer with large surface area is suitable for use as a filter media for efficient removal of hot gaseous pollutants exhausted from combustion processes. For uniform preparation of a Fecralloy coating layer with large surface area and strong adhesion to substrate, electrospray coating and thermal treatment processes are experimentally optimized in this study. A nano-colloidal solution with 0.05 wt% Fecralloy nanoparticles is successfully prepared. Optimized electrospraying conditions are experimentally discovered to prepare a uniform coating layer of Fecralloy nano-colloidal solution on a substrate. Drying the electrospray coated Fecralloy nano-colloidal solution layer at $120^{\circ}C$ and subsequent heating at $600^{\circ}C$ are the best post-treatment for enhancing the adhesion force and surface roughness of the Fecralloy coating layer on a substrate. An electrospray coating system, consisting of several multi-groove nozzles, is also experimentally confirmed as a reasonable device for uniform coating of Fecralloy nano-colloid on a large area substrate.