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형상이 다른 나노입자 스프레이 코팅에 따른 탄소계 강화 유리섬유와 에폭시 수지간 계면강도 관찰
권동준 ( Dong Jun Kwon ),왕작가 ( Zuo Jia Wang ),최진영 ( Jin Young Choi ),신평수 ( Pyeong Su Shin ),이은선 ( En Seon Lee ),박종만 ( Joung Man Park ) 한국복합재료학회 2014 Composites research Vol.27 No.3
나노입자에 대한 복합재료 수요가 증가되면서 효과적인 나노입자 보강재를 이용한 나노복합재료 제조공정 단순화를 추구하고 있다. 본 연구에서는 나노입자를 활용하여 전도성과 계면 강도를 향상시킨 나노입자 강화유리섬유 소재에 대한 연구를 진행하였다. 탄소계 나노입자의 형상에 따른 유리섬유 표면에 흡착된 나노입자 상태를 FE-SEM으로 분석하였다. 나노입자 코팅층의 내구성을 평가하기 위한 방법으로 초음파 세척과정에 따른 나노입자의 세척 정도를 분석하여 탄소계 나노입자의 형상에 따른 나노입자 코팅층의 내구성을 분석하였다. 동적피로 실험을 통하여 나노입자 강화 유리섬유/에폭시의 계면강도를 나노입자 형상에 따른 차이에 따라 비교하였다. 나노입자 코팅층의 내구성은 단섬유 강화 복합재료시편을 이용하여 분석하였다. 겉보기 강성도 결과와 나노입자 코팅층의 전도성 변화를 분석하여 코팅층의 다기능성을 분석할 수 있었다. 판상형의 나노입자 보다는 섬유 형태의 나노입자가 유리섬유 표면에 흡착성이 용이하였다. 계면 내구성 및 안정성에 효과가 있음을 확인하였다. Manufacture of nancomposites has simple process for developing nanocomposites due to the increasing applications using nanofillers. This work studied nanofiller coated glass fiber for reinforcing material with good wetting and conductivity and the morphology of nanofiller coated glass fiber was analyzed by FE-SEM. The durability of reinforced glass fiber was investigated with different shapes of nanofillers using sonication rinsing method. Fatigue test was performed to evaluate the adhesion of reinforcing interface and stability of nanofiller coating layer for single fiber reinforced composites. Apparent modulus and conductivity of nanofiller coating layer were evaluated to realize multifunctional of nanocomposites. Fiber type of nanofiller was better than plate type due to better cohesion between fiber and nanofillers. At last, the stability of fiber type nanofiller of coating layer has better durability and conductivity than plate type case.
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Sea, Connecting the Dots: On the Cusp of Greatness
Germaine Tyo,Jasper Low Cheng En,Lee Jia En,Too Fang Jing,Andrew Karl Delios Academy of Asian Business (AAB) 2019 Academy of Asian Business Review Vol.5 No.2
Sea Limited (formerly Garena Limited) was founded in Singapore in 2009 as a digital entertainment services provider. Since then, Sea has ventured into digital financial services and e-commerce, achieved “unicorn” status, and undergone a successful Initial Public Offering. Sea has now arrived at a crucial juncture in its ascent and must make several important decisions to reach its next milestone. In 2014, Sea launched its digital financial services business: AirPay. AirPay was born out of necessity and strategy as part of Garena’s solution to avoid paying exorbitant transaction fees through third-party transaction services and to act as the foundation of other platforms in Sea’s development pipeline. Following AirPay, Sea launched its e-commerce platform: Shopee. Shopee was Sea’s highly ambitious and aggressive entry into a hotly contested space. Sea has invested significant resources into Shopee which have reaped correspondingly encouraging results. Keys to Sea’s success lie in its service orientation, adaptability, and the speed and decisiveness exhibited in the execution of strategy. These traits have allowed Sea to design the right platforms and products, change with the times and boldly implement planned changes. Asian firms can learn from how Sea manages to navigate the increasingly complex and tumultuous global business environment. Sea now faces major challenges in its way of becoming a truly global brand and faces some uncertainty. Nevertheless, Sea’s trajectory and positioning inspire optimism and will continue on its rise to the top.
ScienceON
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