排序方式： 共有6条查询结果，搜索用时 15 毫秒
1
1.
2.
John P. Helveston Yanmin Wang Valerie J. Karplus Erica R.H. Fuchs 《Research Policy》2019,48(1):206-222
A vast literature on technology transitions within industries suggests that early phases of new technologies are marked by periods of intense experimentation, but we know little about the conditions under which these periods emerge. We apply inductive, grounded theory-building techniques to examine what prompts firms to experiment across one emerging technology platform—plug-in electric vehicles (PEVs)—in China. Triangulating annual vehicle make and model sales data from 2003 to 2016 (plus monthly data from 2010 to 2016); 112 English and Mandarin archival documents from industry, academic, and news outlets; and 51 semi-structured interviews with industry, government, and academic stakeholders, we develop four in-depth case studies. We find that in contrast to the innovation trajectories of multinational and Chinese arms of joint venture (JV) firms, independent domestic Chinese firms (those with no history of international JV partnerships) are undertaking significant experimentation across multiple levels—infrastructure, core system, subsystem, and component—of the emerging PEV technology platform. We propose the concept of “institutional complementarities” to describe how interactions among institutions—here the national JV regulation and local market support and subsidies—may have turned regional markets into protected laboratories, extending the incubation periods for independent domestic firm experimentation. While this diverse experimentation may be an important antecedent of technology transition, consolidation induced by national policy standardization or competitive pressure may be required for PEV innovations to scale beyond their early, protected regional markets. 相似文献
3.
4.
曾青松 《番禺职业技术学院学报》2008,7(3):56-59
详细介绍了一种基于插件技术和角色访问控制的信息系统框架的设计方案,并给出实际的应用,通过插件技术简化系统设计提高系统的可配置性,使开发人员专注于业务逻辑的开发简化界面设计的工作,提高系统的开发效率,基于角色的访问控制技术可有效地控制系统用于对插件和系统功能点的访问权限,有效地提高系统的安全性。 相似文献
5.
在原传统内燃机汽车基础上进行了并联式Plug—in混合动力系统结构设计和主要参数的匹配．提出了一种混合动力汽车设计方案,建立了混合动力主要部件和整车的Simulink模型。并在中国城市公交循环工况和CYC_UDDS循环工况下进行了仿真研究。仿真结果的各项指标均达到了设计要求,混合动力汽车的燃油经济性和排放性均比原车型有明显改善,表明设计方案是合理的。 相似文献
6.
1