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자성 및 발광 특성이 조절 가능한 다기능 코어/중간체/쉘 나노 입자 합성
김문경,김세윤,문경석,신원호,정형모,Kim, Mun-Kyoung,Kim, Seyun,Moon, Kyoung-Seok,Shin, Weon Ho,Jeong, Hyung Mo 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.6
Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>/YVO<sub>4</sub>:Eu<sup>3+</sup> multifunctional nanoparticles are successfully synthesized by facile stepwise sol-gel processes. The multifunctional nanoparticles show a spherical shape with narrow size distribution (approximately 40 nm) and the phosphor shells are well crystallized. The Eu<sup>3+</sup> shows strong photoluminescence (red emission at 619 nm, absorbance at 290 nm) due to an effective energy transfer from the vanadate group to Eu. Core-shell structured multifunctional nanoparticles have superparamagnetic properties at 300 K. Furthermore, the core-shell nanoparticles have a quick response time for the external magnetic field. These results suggest that the photoluminescence and magnetic properties could be easily tuned by either varying the number of coating processes or changing the phosphor elements. The nanoparticles may have potential applications for appropriate fields such as laser systems, optical amplifiers, security systems, and drug delivery materials.
김순경(Soon-Kyung Kim),김문경(Moon-Kyung Kim) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.4
This paper investigates the correlation between surface roughness and gloss of aluminium sheet painted waterborne paint. One customer criterion of automotive quality is the as-painted appearance of the final products. Especially, the current emphasis on control of surface roughness of sanded aluminium sheet has been prompted by the automotive industry's concern with the as-painted appearance. because the influence of such characteristics on paintability, and painted appearance is important in defining outer panel requirements for automobile. This paper is dedicated primarily to the issue of painted appearance and reviews for improvement of roughness. The conclusions are obtained as follows ; 1) Painted aluminium sheet appearance is strongly affected by surface roughness of base-metal and influenced by sand paper and sanding method. 2) The painted appearance of aluminium sheets was determined and related to surface roughness parameters, combination of sand paper.
김문경 ( Moon Kyung Kim ),최철훈 ( Chel Hun Choi ),송태종 ( Tae Jong Song ),박황신 ( Hwang Shin Park ),이유영 ( Yoo Young Lee ),김태중 ( Tae Joong Kim ),이정원 ( Jeong Won Lee ),이제호 ( Je Ho Lee ),배덕수 ( Duk Soo Bae ),김병기 ( 대한산부인과학회 2010 Obstetrics & Gynecology Science Vol.53 No.6
To present a case of successful robotic assisted radical trachelectomy. A nulliparous woman with early cervical cancer underwent a laparoscopic radical trachelectomy and pelvic lymphadenectomy with the da Vinci robot (Intuitive Surgical Inc., Sunnyvale, CA). After the pelvic lymph nodes were found negative on frozen section, the parametria, paracolpia and uterosacral ligaments were dissected transabdominally sparing the ascending branches of the uterine arteries. Cervical transection and vaginal closure were performed transvaginally. Surgical time was 450 min. No perioperative complications were noted. Robotic laparoscopic radical trachelectomy may bridge the gap between laparotomy and laparoscopy for radical trachelectomy.
김문경,전언찬,김순경,Kim, Moon-Kyung,Jeon, Eon-Chan,Kim, Soon-Kyung 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.9
Flatness of cold rolled strip is vital to the quality of the product and productivity of the mill. Therefore, in recent year requirement for flatness control in strip rolling have become increasingly severe. The necessity for more accurate automatic gauge control and automatic flatness control(AFC) has increased by customer's requirement for cold rolled steel sheets with thinner gauge and better flatness quality. In this paper, the performance and functions of AFC system installed on the 4 hi-reversing mill has been investigated under actual conditions. The test results are as follows : The more strip thickness is thick, the smaller the I-value. The I-value is a strain measured by stressometer. Complex distributions of strip tension are controlled to remove not only a quarter buckle but also a simple center wave and edge wave. The defects caused by poor flatness have been drastically decreased. And a proper coolant temperature for work roll cooling system on the AFC system is about $50~55^{\circ}C$.
익상편환자에서 생체접착제를 이용한 변형된 결막소판술의 임상결과
김문경(Moon Kyoung Kim),전익현(Ik hyun Jun),김태임(Tae im Kim),김응권(Eung Kweon Kim),서경률(Kyoung Yul Seo) 대한안과학회 2017 대한안과학회지 Vol.58 No.7
목적: 익상편 환자에서 결막봉합 부위에 생체접착제를 이용한 변형된 결막소판술을 시행한 후 장기간의 임상결과를 보고하고자 한다. 대상과 방법: 2014년 1월부터 2015년 8월까지 단일기관에서 생체접착제를 이용한 변형된 결막소판술을 시행 받은 익상편환자 148명을 대상으로 후향적으로 분석하였다. 생체접착제를 이용한 변형된 결막소판술을 받은 환자에서의 재발률 및 수술 소요시간을 분석하였다. 동일 수술을 받은 환자에서 재발한 군과 재발하지 않은 군을 비교하여 관련인자를 평가하였다. 결과: 대상자의 평균 나이는 60.2 ± 1.1세(29-86)이며, 평균 수술 소요시간은 11.8 ± 5.8분(5-36)이었다. 총 대상 148명 중 재발률은 4.0% (6/148)로 나타났으며 재수술률은 0.6% (1/148)로 나타났다. 생체접착제를 이용한 변형된 결막소판술을 시행 받은 환자에서 재발한 군과 재발하지 않은 군을 비교해 본 결과, 재발한 군에서 환자의 연령이 어렸고, 익상편의 중증도가 높았으며, 양안성으로 발병한 경우가 많았다(p<0.05). 결론: 생체접착제를 이용한 변형된 결막소판술은 기존의 익상편 수술만큼 안전하며 재발률이 낮은 수술방법이다. 생체접착제를 이용함으로써 수술시간의 단축 및 봉합사의 감소로 수술 후 불편감을 줄여줄 수 있어 익상편 수술방법으로 고려할 수 있는 술식이다. <대한안과학회지 2017;58(7):797-803> Purpose: To analyze the long-term clinical outcomes after use of fibrin glue using a modified mini-flap technique for pterygium surgery. Methods: This study is a retrospective, clinical outcome study of 148 subjects that underwent the modified mini-flap technique with fibrin glue from January 2014 to August 2015. We analyzed the recurrence rate and surgical time of modified mini-flap surgery with fibrin glue. We also analyzed associating factors between the recurrence group and non-recurrence group who underwent the same surgery technique. Results: Mean age was 60.2 ± 1.1 (ranging from 29 to 86) years, and mean surgical time was 11.8 ± 5.8 (ranging from 5 to 36) minutes. The recurrence rate of pterygium patients who underwent the fibrin glue using a modified mini-flap technique was 4.0% (6/148), and the re-operation rate was 0.6% (1/148). From the comparison of associating factors between recurred and non-recurred groups, the recurred group was younger, had more severe disease, and had a higher rate of bilaterality than the non-recurred group (p < 0.05). Conclusions: The new approach using fibrin glue with a modified mini-flap technique shows a low recurrence rate compared to the other type of pterygium surgery. The use of fibrin glue shortened operation time and decreased patient discomfort due to fewer remnant sutures. Fibrin glue use in a modified mini-flap technique can be considered as a feasible surgical option for pterygium patients. J Korean Ophthalmol Soc 2017;58(7):797-803