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소성민,김경훈,박주석,김민숙,김형순,So, Sung Min,Kim, Kyoung Hun,Park, Joo Seok,Kim, Min Suk,Kim, Hyung Sun 한국결정성장학회 2019 한국결정성장학회지 Vol.29 No.6
B<sub>4</sub>C-SiC 복합체를 소결 첨가제 없이 일축가압소결법을 통해 제조하였으며 소결체의 결정상, 상대밀도, 미세구조 및 기계적 특성을 평가하였다. 제조된 B<sub>4</sub>C-SiC 복합체에서 B<sub>4</sub>C와 SiC는 균일하게 분산되어 결정립 성장을 억제하고 세밀하고 균일한 미세구조를 형성하였으며 이를 통해 B<sub>4</sub>C-SiC 복합체의 기계적 특성을 향상시킬 수 있었다. 소결온도 2,000℃, 40 MPa 압력 조건에서 소결된 B<sub>4</sub>C-SiC 복합체의 상대밀도는 99.8 % 이상이었으며, B<sub>4</sub>C 50 wt% 조성 복합체의 꺾임 강도와 비커스 경도는 각각 약 625 MPa과 30 GPa로 측정되었다. B<sub>4</sub>C-SiC composites were fabricated using hot press sintering method without sintering additives at 1,900~2,000℃ under a pressure of 40 MPa. The crystal phase, relative density, microstructure, and mechanical properties of B<sub>4</sub>C-SiC composites were evaluated. When B<sub>4</sub>C and SiC were uniformly dispersed in the composite, grain growth was inhibited, and a sintered body with a fine and uniform microstructure, with improved mechanical properties, was fabricated. The relative density of B<sub>4</sub>C-SiC composites sintered under 2,000℃ of temperature and 40 MPa of pressure was over 99.8 %, and the bending strength and Vicker's hardness at 50 wt% of B<sub>4</sub>C were 645 MPa and 30.6 GPa, respectively.
소성민 ( Sung-min So ),정정조 ( Cheong-jo Cheong ),정상철 ( Sang-chul Jung ),이경동 ( Gyeong-dong Lee ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2011 한국환경기술학회지 Vol.12 No.2
분말활성탄의 계면활성제 흡착특성을 파악하기 위하여 계면활성제 함유수에 대하여 활성탄 첨가량, 온도, pH, 접촉시간 등을 변화시키면서 제거율을 검토하였다. 활성탄 첨가량에 따른 LAS의 제거율은 활성탄 첨가량 100mg/L까지는 제거율이 급증하였으나 120mg/L부터는 증가율이 둔화되는 경향을 나타내고 있다. pH의 변화에 따른 LAS의 제거율은 큰 변화를 나타내지 않았으나, 산성 영역에서 약간 증가하는 경향을 나타내고 있다. 접촉시간의 변화에 따른 LAS의 제거율은 30분까지는 급증하였으나 그 이후에는 서서히 증가하는 경향을 나타내었고, 60분이후부터는 변화가 거의 없었다. 온도 변화에 따른 LAS의 제거율은 온도가 증가할수록 증가하는 경향을 나타내고 있다. 분말활성탄의 흡착등온선은 Langmuir식이나 Freundich식으로 표현이 가능하였다. In order to understand the adsorption characteristics of LAS(Linear Alkyl Sulfonate) for PAC(Powdered Activated Carbon), the LAS removal efficiency in water were investigated on various experiment conditions, such as variation of PAC dosage, temperature, pH, contact time etc. The LAS removal efficiency had shown a tendency of rapid increasing until 100mg/L of PAC dosage, but it was weakened after 120mg/L. Even though pH was no more effect to LAS removal, its removal efficiency was shown a little growth in acid range. As an effect of contact time, the LAS removal efficiency was rapidly increased till 30min, but it was slowly increased after then. This phenomenon could be explained that adsorbed LAS on the PAC surface could effect to resistant of PAC particle. The LAS removal efficiency was increased with temperature growth, because PAC adsorption had been carried on exothermic reaction.
Smart-Grid를 위한 Home Automation Control 기술동향
소성민(Sung-Min So),김건중(Kurn-joong Kim),박철우(Chul-Woo Pack),양민욱(Min-Uk Yang),이지혜(Ji-Hye Lee),김영문(Young-Moon Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
홈오토메이션 기술은 집안의 조명, 냉난방, 방범, 통신 등의 기능을 하나의 시스템으로 통합하여 제어함으로써 인간의 생활수준을 향상시키는 기술을 말한다. 본 논문에서는 Home Automation 제어기에 대해 알아보았다. 제어기의 구조와 요구사항, 제어기를 분류 하였고, 마지막으로 시장 동향에 대해서 조사하였다. 현 사용하고 있고 이미 구현된 상황이지만, 다시 살펴보면서 수정 및 보안할 부분에 대해 생각해 볼 필요가 있다.
서스펜션 플라즈마 스프레이 코팅법을 이용한 이트리아 코팅막 제조와 특성
김민숙,소성민,김형순,박성환,함영재,전민석,김경훈,Kim, Min Suk,So, Sung Min,Kim, Hyung Soon,Park, Seong Hwan,Ham, Young Jae,Jeon, Min Seok,Kim, Kyoung Hun 한국결정성장학회 2019 한국결정성장학회지 Vol.29 No.6
The suspension plasma spraying is a modification of conventional plasma spray techniques that has been developed to overcome the challenge of using fine particles in plasma spray processes. In this study, microstructure developments and mechanical property of yttrium oxide (Y<sub>2</sub>O<sub>3</sub>) coatings prepared by the suspension plasma spray coating technique have been investigated to determine the effect of processing parameters including plasma gun current and total gas flow. The results showed that a highly dense Y<sub>2</sub>O<sub>3</sub> coating having low porosity of 0.2 vol% without any lamellar structures can be achieved at the optimum condition of gun current 200 A and total gas flow 220 L/min. 서스펜션 플라즈마 스프레이 법은 미세한 분말을 용사 공정에 적용함으로써 전통적인 플라즈마 스프레이 법의 단점을 극복하고자 개발된 코팅법이다. 본 연구에서는 고밀도의 Y<sub>2</sub>O<sub>3</sub> 코팅막을 제조하기 위해 서스펜션 플라즈마 스프레이법을 이용하여 플라즈마 건의 전류량과 총 가스 유량을 공정변수로 하여 코팅막을 제조하였으며, 그에 따른 코팅막 특성에 대한 연구를 하였다. 코팅막의 미세구조 및 물리적 특성 평가 결과 플라즈마 건 전류량 200 A, 총 가스 유량 220 L/min의 조건에서 층상 결함 없이 0.2 vol%의 매우 낮은 기공률을 갖는 고밀도의 Y<sub>2</sub>O<sub>3</sub> 코팅막을 제조할 수 있었다.
플럭스 염화물 조성이 Zn-Mg-Al 3원계 합금도금층의 미세조직 및 도금성에 미치는 영향
김기연,소성민,오민석 한국재료학회 2021 한국재료학회지 Vol.31 No.12
In the flux used in the batch galvanizing process, the effect of the component ratio of NH₄Cl to ZnCl₂ on the microstructure, coating adhesion, and corrosion resistance of Zn-Mg-Al ternary alloy-coated steel is evaluated. Many defects such as cracks and bare spots are formed inside the Zn-Mg-Al coating layer during treatment with the flux composition generally used for Zn coating. Deterioration of the coating property is due to the formation of AlClx mixture generated by the reaction of Al element and chloride in the flux. The coatability of the Zn-Mg-Al alloy coating is improved by increasing the content of ZnCl2 in the flux to reduce the amount of chlorine reacting with Al while maintaining the flux effect and the coating adhesion is improved as the component ratio of NH4Cl to ZnCl2 decreases. Zn-Mg-Al alloy-coated steel products treated with the optimized flux composition of NH₄Cl•3ZnCl₂ show superior corrosion resistance compared to Zn-coated steel products, even with a coating weight of 60 %.
근치적 전립선적출술 후 요실금에 대한 체외자기장치료의 효과
구대용,소성민,임재성 대한비뇨의학회 2009 Investigative and Clinical Urology Vol.50 No.1
Purpose: To evaluate the safety and clinical effects of extracorporeal magnetic innervation(ExMI) for urinary incontinence after radical prostatectomy. Materials and Methods: Thirty-two patients with urinary incontinence after radical prostatectomy were randomly assigned to receive either ExMI treatment or pelvic floor training alone. For the ExMI group, treatment was initiated 1 week after catheter removal and the treatment sessions were for 20 minutes, twice a week, for 8 weeks. For the control group, only pelvic floor muscle exercises were performed. Patients were followed up at 1 week and 1, 2, 3, and 6 months. Outcomes were assessed by 24-hour pad weight testing, the number of pads used daily, and a quality-of-life survey(I-QoL). Results: Leakage weight during the 24 hours after removing the catheter was 655g and 646g for the ExMI and control groups, respectively. At 1 month, it was 147g and 187g; at 2 months, 33g and 81g(p=0.001); and at 3 months, 9g and 45g(p=0.001), respectively. Finally, 6 months later, leakage weight was less than 10g in both groups. The number of pads used daily after removing the catheter was 4.2 and 4.1 for the ExMI and control groups, respectively. At 1 month, it was 1.5 and 1.8; at 2 months, 0.6 and 0.9(p=0.033); and at 3 months, 0.1 and 0.6(p=0.002), respectively. Finally, 6 month later, pads counts were 0 and 0.1. I-QoL scores decreased after surgery, but gradually improved in both groups. No other side effects or adverse events were observed. Conclusions: ExMI provided earlier recovery of continence than in the control group after radical prostatectomy. Purpose: To evaluate the safety and clinical effects of extracorporeal magnetic innervation(ExMI) for urinary incontinence after radical prostatectomy. Materials and Methods: Thirty-two patients with urinary incontinence after radical prostatectomy were randomly assigned to receive either ExMI treatment or pelvic floor training alone. For the ExMI group, treatment was initiated 1 week after catheter removal and the treatment sessions were for 20 minutes, twice a week, for 8 weeks. For the control group, only pelvic floor muscle exercises were performed. Patients were followed up at 1 week and 1, 2, 3, and 6 months. Outcomes were assessed by 24-hour pad weight testing, the number of pads used daily, and a quality-of-life survey(I-QoL). Results: Leakage weight during the 24 hours after removing the catheter was 655g and 646g for the ExMI and control groups, respectively. At 1 month, it was 147g and 187g; at 2 months, 33g and 81g(p=0.001); and at 3 months, 9g and 45g(p=0.001), respectively. Finally, 6 months later, leakage weight was less than 10g in both groups. The number of pads used daily after removing the catheter was 4.2 and 4.1 for the ExMI and control groups, respectively. At 1 month, it was 1.5 and 1.8; at 2 months, 0.6 and 0.9(p=0.033); and at 3 months, 0.1 and 0.6(p=0.002), respectively. Finally, 6 month later, pads counts were 0 and 0.1. I-QoL scores decreased after surgery, but gradually improved in both groups. No other side effects or adverse events were observed. Conclusions: ExMI provided earlier recovery of continence than in the control group after radical prostatectomy.