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김묵한(Mook-Han Kim),김범식(Bum-Sik Kim),임현규(Hyunkyu Lim),장윤희(Yoon Hyi Jang) 서울연구원 2013 서울연구원 정책과제연구보고서 Vol.- No.-
Youth unemployment problem has become a worldwide crisis in the last decade, and youth entrepreneurship has been one of many feasible solutions of the problem. Seoul is not an exception to this harsh reality. As a major metropolis in Korea, the youth unemployment rate is even higher than that of South Korea as a whole. Seoul has been building its own publicly-subsidized entrepreneurship ecosystem to the youth. However, as private entrepreneurship ecosystem in Seoul manifests, the old entrepreneurship ecosystem based on the vertical integration of policy packages in a few large startup incubators is losing its validity and showing its limitations. To find out the new paradigm for the existing model, this study searches for the new ‘social’ trends in the youth entrepreneurship scene, which prove their values in startup ecosystems around the world nowadays. 10 inter-related trends in social entrepreneurship processes have been identified in 4 different policy areas. In education, the education of entrepreneurship in universities and institutions, and that of entrepreneurship in social economy are distinct features. Mentoring and regular group networking become popular in information exchange. Coworking space, digital production workshop, accelerator, and the recycling of underused spaces are major innovations in providing spaces for entrepreneurs. Crowdfunding and new investments from private sectors for societal purposes have been changing how start-ups raise the funds in entrepreneurship financing. To invigorate the youth entrepreneurship in Seoul, current vertical integration model of the youth entrepreneurship policy 1.0 has to be changed to the youth entrepreneurship policy 2.0 of a mix-and-match model, which allows a more open startup ecosystem through the utilization of soft social platforms and the collaboration of diverse private stakeholders. In each of 4 policy areas of youth entrepreneurship - education, information, space, funding, identified trends of social entrepreneurship process should be grafted onto the existing policy regime of youth entrepreneurship.
CaO가 첨가된 Mg-Al-Si 합금의 미세조직 및 크리프 거동
정영길 ( Young Gil Jung ),양원석 ( Wonseok Yang ),김세광 ( Shae K Kim ),임현규 ( Hyunkyu Lim ),김도향 ( Do Hyang Kim ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.10
For automotive parts used at elevated temperatures, such as transmission cases and engine blocks, it is necessary to improve the creep resistance of magnesium alloys. For this reason, various magnesium alloys have been developed for elevated temperature applications. In this study, the microstructure and creep behavior of CaO added Mg-Al-Si alloys (Mg-5.0Al-0.7Si, Mg-5.0Al-0.7Si-0.5CaO, Mg-5.0Al-0.7Si- 0.5CaO-0.3Sr) were investigated. The microstructures were observed by OM, SEM and TEM. To evaluate the mechanical properties, tensile tests were carried out at room and high temperature, and creep tests were performed at 150 ℃ with applied loads from 50 to 80 MPa.