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송재주 ( Jae Joo Song ),김경선 ( Kyeong Seon Kim ) 한국치위생학회 2007 한국치위생학회지 Vol.7 No.4
The purpose of this study was to examine the optimum condition of impulse during the anodic spark oxidation applying pulse current as well as to find the excellent condition for HA precipitation the after electrochemical hydrothermal treatment by cathode reduction method. After anodic spark oxidation, the anodized specimen and the Pt plate connected cathode and anode, respectively. Hydrothermal treatment performed at 90, 120, 150°C for 2 hours in the electrolyte containing K2HPO4, CaCl2. 2(H2O), Tris(Hydroxymethyl)-(CH2OH)3CNH2(Aminomethane), and NaCl. The optimum impulse voltage for anodic spark oxidation was 350 V. The optimum pulse cycle measured at 10 mS. The HA crystals precipitated excellently by cathode reduction at 150°C for 2 hours. The phases of anatase, rutile, and HA coating on the surface of modified titanium surface immersed in Hanks` solution for 3weeks were detected by XRD measurement and the intensity of HA crystal phase has increased by temperature and time of hydrothermal treatment. According to the our experiments, we found that Pure Ti will be good materials of bioactivity and biocompatibility.
TiO₂ 나노튜브를 형성한 Ti-6Al-4V 합금의 석회화 순환처리가 생체활성도에 미치는 영향
송재주(Jae-Joo Song),한아름(A-Lum HAN),정세진(Se-Jin Jung),석홍병(Hong-Bing Shi),변선미(Seon-Mi Byeon),임청하(Chung-Ha Lim) 대한치과재료학회 2016 대한치과재료학회지 Vol.43 No.3
The purpose of this study was to evaluate the effect of calcium phosphate treatment on the bioactivity of Ti-6Al-4V alloy modified by anodic oxidation, pre-calcification treatment, and heat treatment. Anodic oxidation were performed to increase specific surface area and form nanotubular TiO₂ layer (AH). After that, pre-calcification treatment was carried out in NaH2PO4 solution and Ca(OH)₂ saturated solution for 10 cycles (APH 10) and 30 cycles (APH 30) to induce the precipitation of calcium phosphates on surface. Additionally, the specimens were heat treated for structural stability and elimination of remaining impurities. The nanotubes were shown densely on the AH group. APH 10 and 30 groups showed the precipitated calcium phosphate on the nanotubular TiO₂ layer, but the APH 30 group showed more precipitation of calcium phosphate. Additionally, APH 10 and 30 groups showed the precipitation of HAp after immersion in SBF for 3 days. Compared to the untreated group, the surface treatment groups (AH, APH 10, and APH 30) showed a significant increase in surface roughness (p < 0.05), and the APH 30 group showed the highest surface roughness. Contact angle was decreased significantly in the surface treated groups compared to the untreated group (p < 0.05), and wettability was highest in APH 30 group. Consequently, we found out that APH 30 group greatly improved bioactivity by formation of nanotubular TiO₂ layer and HAp precipitation.
양극산화와 석회화 순환처리에 따른 Ti-6Al-4V 합금 임플란트의 생체활성도 및 내식성 평가
송재주(Jae-Joo Song) 대한치과재료학회 2016 대한치과재료학회지 Vol.43 No.1
This study was performed to evaluate biological activity and corrosion resistance on Ti-6Al-4V alloy implant surface modified by anodic oxidation, cyclic pre-calcification treatments and heat treatment and immersed in SBF solution. Ti-6Al-4V alloy implant of SLA-treated internal hex type with 4.0 ㎜ in diameter and 11.5 ㎜ in length were used. Anodic oxidation was performed in oder to increase specific surface area and form nanotubular TiO2 layer. And then, cyclic pre-calcification treatment was carried out by alternative immersion in 0.05 M NaH2PO4 solution at 80℃ and in Ca(OH)₂ saturated solution at 100℃ for 20 cycles, carried out to induce the precipitation of HAp crystals on the surface. The specimens were heat treated for structural stability and get rid of remaining impurities. And to investigate the bioactivity of these surface, the specimens were immersed in SBF solution and micro structural change of the surfaces was observed by FE-SEM. The concentration and the crystal structure of elements present on the surface were analyzed energy dispersive using XRD analysis. On the other hand, potentiodynamic polarization was performed in order to evaluate the corrosion resistance in Ti-6Al-4V alloy implant surface with electrochemical measurement of corrosion potential and corrosion current density. Consequently, Ti-6Al-4V alloy implant surface modified were increased specific surface area with a form nanotubular TiO2 layer and more precipitated of HAp as the result of immersion in the SBF for 3days. APH (Anodic oxidation+Cyclic pre-calcification+Heat treatment) specimens greatly improved biological activity and corrosion resistance.
티타늄 메쉬상에 전석회화된 TiO₂ 나노튜브층의 구조 및 생체활성
송재주(Jae-Joo Song),박형호(Hyeoung-Ho Park) 대한치과재료학회 2011 대한치과재료학회지 Vol.38 No.2
Various surface modification techniques are being used to improve the interfacial properties between human cells and the Ti-based implant surface. Titanium mesh is used in supporting the membrane, providing the necessary space for bone regeneration. This study was performed to investigate the bioactivity of anodized and precalcified titanium mesh. Mesh plate of Ti was anodized at 20 V for 60 minutes in a glycerol solution containing 1wt% NH₄F and 20 wt% deionized water. Heat treatment was achieved in a furnace heated to 500℃ for 2 hours. Precalcification treatment was carried out by soaking in NaH₂PO₄ solution at 80℃ for 30 minutes and saturated Ca(OH)₂ solution at 100℃ for 30 minutes. Results of MMT assay, nanotubular TiO₂ layer showed the highly ordered dense structure and cell viavility by interposing small diameter nanotubes between large ones, the shape of nanotubes was enlarged as going down. Therefore, the cell viability of anodized titanium mesh plate was more improved by precalcification treatment in 0.5 M Na₂HPO₄ and saturated Ca(OH)₂ solution. therefor, The bioactivity of titanium mesh plate was enhanced by anodic oxidation and precalcification treatment.
송재주 ( Jae-ju Song ),주용재 ( Yong-jae Joo ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2
고도의 지능화가 요구되는 디지털 전력시스템의 R&D SW를 개발하기 위해서는 감시, 제어, 최적화 등 다양한 SW 간의 상호 데이터 및 서비스의 더욱 긴밀한 연계가 필요하다. 본 논문에서는 전력분야 R&D SW의 개발 생산성을 높이고 품질을 확보할 수 있을 뿐만 아니라, SW간 데이터 및 서비스의 상호 운용성을 강화할 수 있는 Java OSGi 기반의 SW 표준프레임워크(KSF)를 제안하고, 공통모듈 서비스 및 기초UI를 설계하였다.
송재주,이정철,임성훈,고석철,한병성,Song, Jae-Joo,Lee, Jung-Choi,Lim, Sung-Hun,Ko, Seok-Cheol,Han, Byung-Sung 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.10
Various stresses (such as electrical stress, mechanical stress, environmental and electrochemical stress, and defects of structure) result in insulation degradation of epoxy mold type insulators. Since the insulation degradation of BCT(Bushing Current Transformer) and bushing proceeds during fabrication process or operation time due to these causes, various methods to reduce the degradation in their insulation ability have been suggested. In this paper, we investigated surface temperature increment of these insulators due to PD(partial discharge). After the voltage applied into the insulator to generate the artificial PD, the surface temperature of the insulator was measured with non-contact thermometer using infrared rays. It was confirmed through the analysis based on PD experiments that the procession in the insulation degradation of the insulator could be estimated through the measurement of the surface temperature in the insulator.
송재주(Song jae ju),이정일(Lee jeong il),신진호(Sin jin ho),강주영(Kang joo yeong),이봉재(Yi bong jae) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
본 논문은 원자력발전소 비상디젤발전기의 신뢰도 및 성능변화 추이를 감시하고, 이에 필요한 데이터를 관리하는 비상디젤발전기 신뢰도 프로그램 개발에 관하여 기술하였다. 이 프로그램은 인트라넷 기술을 이용하여 신뢰도 감시, 성능 감시, 그리고 관련정보로 크게 3가지 모듈로 구분하여 개발하였다. 현재 이를 통하여 원전 비상디젤발전기의 운전 및 정기점검 데이터를 입력 관리할 수 있도록 서비스를 개시하였으며, 이미 기존에 입력된 데이터를 이용하여 신뢰도 및 이용 불능도를 계산할 수 있고 또한 성능변화 추이를 감시할 수 있다.
주용재 ( Yong-jae Joo ),송재주 ( Jae-ju Song ),최민희 ( Min-hee Choi ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2
한국전력공사(KEPCO) 전력연구원(KEPRI) 소프트웨어센터에서는 연구과제에 포함되어 개발되는 R&D SW의 개발/품질관리 업무의 효율적 수행 및 품질확보를 위하여 “R&D SW 엔지니어링 플랫폼(KSEP : KEPRI Software Engineering Platform)”을 구축하여 현재 운영중에 있다. KSEP은 SW 개발 및 품질관리 업무의 체계적인 수행을 지원하기 위한 국제표준모델(CMMI-DEV) 기반의 프로세스지원 통합 시스템으로서 워크플로우관리, 일정관리, 요구사항관리, 검증 및 확인(V&V) 등의 기능 및 도구를 제공한다.