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정창수,이우선 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
This study refers to the characterization techniques of power cables. The cable failure brings about an enormous loss of power supply and the immense expense for cable replacement. These characterization techniques can be used for identifying a cause of failure and for improving a quality of equipments. Also, these play an important role in the detection of premature failure. From the characterization results of failed cables, water trees grown from insulation shield had a relation with ionic impurities of insulation shield. The main causes of cable failure were void, non-crosslinking, convolution from manufacturing process. In order to maintain a cable reliability, quality control is needed strictly. It can be possible to estimate a residual lifetime of power cable using characterization techniques.
When outbound mobility programs and service learning align in pre-service teacher education
Anne Power,Son Truong,Tonia Gray,Greg Downey,Tim Hall,Benjamin Jones 서울대학교 교육연구소 2017 Asia Pacific Education Review Vol.18 No.3
This project sought to investigate the learning that comes about from the intersection of outbound mobility experience programs (OMEs) with service learning in pre-service teacher education settings. The aim of the program of international service learning in the case study was to encourage pre-service teachers to rethink potentially ethnocentric assumptions. The guiding research question was, ‘What outcomes ensue from the combination of OMEs and service learning for pre-service teachers?’ The focus of the paper was on OMEs that took place in China and Malaysia. Findings included that the combined program aided development of global mindedness, learning by being there, teacher experience in a new context and the development of a professional identity in the participating students.
Tensile bond strength of four denture resins to porcelain teeth with different surface treatment
John Power,Mohamed El-Sheikh 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.4
PURPOSE This study evaluated the bond strength between porcelain denture teeth (Bioblend 43D) and four different polymerized denture resins (Lucitone 199, Palapress, Acron MC, Triad) with and without a bonding agent and after four different types of surface treatment (polished, HF etched, sandblasted, air-abraded). MATERIALS AND METHODS Central incisor porcelain denture teeth were divided into 32 groups of 5 each. Tensile bond strength (MPa) was determined using a testing machine at crosshead speed of 0.5 mm/min. Mean and standard deviation are listed. Data were analyzed by two-way ANOVA. Means were compared by Tukey-Kramer intervals at 0.05 significance level. RESULTS All surface treatment increased bond strength compared to polished surface and the highest bond strength was found with Palapress resin with etched porcelain surface (8.1 MPa). Bonding agent improved the bond strength of all denture resins to porcelain teeth. Superior bonding was found with Palapress and air-abraded porcelain (39 MPa). CONCLUSION Resins with different curing methods affect the bond strength of porcelain teeth to denture bases. Superior bonding was found with auto-polymerized resin (Palapress). Application of ceramic primer and bonding agent to porcelain teeth with and without surface treatment will improve the bond strength of all denture resins to porcelain teeth.