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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.
함정 전기추진시스템 글로벌 트렌드와 차세대 구축함에 대한 제언
GE 파워컨버젼 사업부, GE Marine(GE Power Conversion, GE Marine) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.4
자동차 및 항공 부문 등에서는 미래에 점점 더 깨끗한 운송 및 원거리 연결을 위한 플랫폼을 도입하거나 평가하기 위해 전동화 즉, 전기추진 또는 하이브리드추진 플랫폼을 적극적으로 고려하고 있다. 그러나 전동화는 조선해양 분야에서는 그리 새로운 것은 아니며 이미 약 100년 전에 처음 선박용으로 전기 및 하이브리드 추진시스템이 소개되었다. GE는 해군 함정의 추진 부문, 특히 전기 및 하이브리드 추진 기술과 관련해서 매우 초기단계 부터 혁신적인 기술을 도입해왔던 선구자로써 각 추진방식에 대한 장/단점, 앞으로의 방향에 대하여 기술하고자 한다.
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.
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.