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전자기 연속 주조법을 이용한 의료용 타이타늄 합금 제작에 관한 연구
최수지 ( Su-ji Choi ),이현재 ( Hyun-jae Lee ),백수현 ( Su-hyun Baek ),현승균 ( Soong-keun Hyun ),정현도 ( Hyun-do Jung ),문병문 ( Byung-moon Moon ) 한국주조공학회 2018 한국주조공학회지 Vol.38 No.1
Electromagnetic continuous casting (EMCC) was used to fabricate Ti-6Al-4V alloys with properties suitable for medical applications. Ti-6Al-4V alloy ingots fabricated by EMCC were subjected to heat treatment, such as residual stress removing (RRS), furnace cooling after solution treatment (ST-FC) and water-cooling after solution treatment (ST-WC), in order to obtain characteristics suitable for the standard. After component analysis, the microstructure and mechanical properties (tensile strength and elongation) were evaluated by ICP, gas analysis, OM, SEM, a Rockwell hardness tester and universal testing machine. The Ti-6Al-4V alloy ingot fabricated by EMCC was fabricated without segregation, and the lamellar structure was observed in the RRS and ST-FC specimens. The ST-WC specimen showed only martensite structure. As a result of evaluating the mechanical properties based on the microstructure results, we found that the water-cooled heat treatment condition after the solution treatment was most suitable for the Ti-6Al-4V ELI standard.
전자기 연속 주조법을 이용한 의료용 타이타늄 합금 제작에 관한 연구
최수지 ( Su-ji Choi ),이현재 ( Hyun-jae Lee ),백수현 ( Su-hyun Baek ),현승균 ( Soong-keun Hyun ),정현도 ( Hyun-do Jung ),문병문 ( Byung-moon Moon ) 한국주조공학회 2018 한국주조공학회지 Vol.38 No.2
Electromagnetic continuous casting (EMCC) was used to fabricate Ti-6Al-4V alloys with properties suitable for medical applications. Ti-6Al-4V alloy ingots fabricated by EMCC were subjected to heat treatment, such as residual stress removing (RRS), furnace cooling after solution treatment (ST-FC) and water-cooling after solution treatment (ST-WC), in order to obtain characteristics suitable for the standard. After component analysis, the microstructure and mechanical properties (tensile strength and elongation) were evaluated by ICP, gas analysis, OM, SEM, a Rockwell hardness tester and universal testing machine. The Ti-6Al-4V alloy ingot fabricated by EMCC was fabricated without segregation, and the lamellar structure was observed in the RRS and ST-FC specimens. The ST-WC specimen showed only martensite structure. As a result of evaluating the mechanical properties based on the microstructure results, we found that the water-cooled heat treatment condition after the solution treatment was most suitable for the Ti-6Al-4V ELI standard.
직사각형 슬릿 개구를 갖는 금속 함체의 차폐 효과에 대한 연구
이숭근(Soong Keun Lee),성철민(Cheol Min Seong),김은하(Eun Ha Kim),유승렬(Seung Real Ryu),이재현(Jae Hyun Lee),박동철(Dong Chul Park) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.5
직사각형 슬릿 개구를 갖는 금속 함체에 수직, 수평 편파를 입사하여 차폐 효과를 연구하였다. 직사각형 슬릿 개구의 magnetic polarizability와 금속 함체의 공진 모드를 이론적으로 분석하였고, 이를 바탕으로 시뮬레이션 결과와 측정 결과를 비교 분석하였다. 또한, 함체 내부 프로브의 위치에 따른 차폐 효과 의존성도 분석하였다. Shielding effectiveness(SE) of metallic rectangular enclosure with rectangular slit apertures at horizontal polarization(HP) and vertical polarization(VP) is investigated. The magnetic polarizability of the rectangular slit apertures and the resonance modes of the metallic rectangular enclosure are analyzed theoretically. The simulation results based on these theoretical analyses are compared with the measured ones. The dependence of the shielding effectiveness on the location of the calculation probe inside the enclosure is also investigated.
양현민(Hyun-Min Yang),유회수(Hoi-Soo Ryoo),현승균(Soong-Keun Hyun) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.3
The digital controlled SMA welding power source having the hot start current and short circuit waveform control was developed. The inverter power controller was used an analog circuit and the short circuit waveform controller was developed using a 8-bit MCU. For the evaluation of the developed SMA welding power source it were compared with a domestic welding power sources. Using the high titanium oxide type and low hydrogen type electrodes, the characteristics of hot start and short circuit was evaluated. Developed SMA welding power source shows good start performance. Also, arc stability and low current weldability were improved by the short circuit waveform control.
김상현,김기영,박재호,김혜순,박승국,윤상미,박근규,권기민,도주호,황준영 대한내과학회 2000 대한내과학회지 Vol.59 No.5
Bypass surgery, as therapy for morbid obesity, was introduced in 1952. Multiple complications such as arthritis and dermatitis as well as liver dysfunction, renal injury, diarrhea, malnutrition and electrolyte imbalance were reported after bypass surgery. Recently, we have experienced a case of bypass arthritis-dermatitis syndrome in a patient after pyloric exclusion and bypass gastrojejunostomy due to traumatic duodenal perforation. He complained arthralgia of left knee, both wrist and both ankle and developed erythematous maculopapular rash over lower extremities. He was successfully treated with NSAIDs and clindamycin.(Korean J Med 59:583-586, 2000)
Lee, Ji-Woon,Choi, Hyun-Jin,Jung, Taek-Kyun,Lee, Byong-Pil,Kim, Myoung-Gyun,Kim, Kyung-Taek,Kim, Tae-Bum,Choi, Ho-Joon,Hyun, Soong-Keun American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.11
<P>Pressure-assisted investment casting based on the pressure differential between melting and casting chambers was used to fabricate a tetrahedral titanium lattice structure. The pressure differential between the melting chamber and the casting chamber effectively minimized the formation of the alpha-case layer and the tensile yield strength was barely influenced by the thin alpha-case layer. The effective compressive yield strength of the titanium lattice structure was dependent upon the number of cells. Cracks were generated at the joint of the struts in the titanium lattice structure during compression tests. An increased number of cells resulted in a decrease of the effective yield strength by concentrating stress at the joint between the struts where the bending stress was applied. As a result, the mechanical properties of the titanium lattice structure were strongly affected by structural morphology and the number of cells.</P>