为了实现一种基于开放服务网关(open service gateway initiative,OSGi)思想的分布式服务治理系统,通过使用C/C++语言对Java领域的OSGi框架在模块层、生命周期层、服务层的框架思想进行改写和扩展,并将其部署至Linux平台进行验证。主要...为了实现一种基于开放服务网关(open service gateway initiative,OSGi)思想的分布式服务治理系统,通过使用C/C++语言对Java领域的OSGi框架在模块层、生命周期层、服务层的框架思想进行改写和扩展,并将其部署至Linux平台进行验证。主要研究内容分别为任务服务封装方法、服务注册方法、服务查找方法和服务状态管理方法,通过对以上部分研究在Linux系统环境下实现了基于OSGi思想的服务治理系统。系统实现了分布式需求,并且保留实现了OSGi思想中服务规范性、可扩展性、可迁移性等优势。展开更多
Abstract: Migration process has become increasingly important in recent research on population and the environment. A majority of the existing migration and environment literature has focused on the environmental cau...Abstract: Migration process has become increasingly important in recent research on population and the environment. A majority of the existing migration and environment literature has focused on the environmental causes and determinants of migration. With the largest rural-to-urban migration flow in world history, and growing concerns about the environmental problems accompanying its fast economic development, China provides a particularly important case for migration and environment research. This paper reviews major migration theories and recent research on environmental effects on migration, with specific attention to the influences of en- vironmental factors on rural-to-urban labor migration in China. A comprehensive multilevel conceptual framework is developed for studying the environmental causes of rural-to-urban migration in China. The effects of land resources on household labor migration decisions in rural China are explored to illustrate the application of this framework.展开更多
文摘为了实现一种基于开放服务网关(open service gateway initiative,OSGi)思想的分布式服务治理系统,通过使用C/C++语言对Java领域的OSGi框架在模块层、生命周期层、服务层的框架思想进行改写和扩展,并将其部署至Linux平台进行验证。主要研究内容分别为任务服务封装方法、服务注册方法、服务查找方法和服务状态管理方法,通过对以上部分研究在Linux系统环境下实现了基于OSGi思想的服务治理系统。系统实现了分布式需求,并且保留实现了OSGi思想中服务规范性、可扩展性、可迁移性等优势。
基金funded by dissertation research grants from the Geography and Spatial Sciences Program of the National Science Foundation,the Worldwide Universities Network,and the Rural Sociological Society
文摘Abstract: Migration process has become increasingly important in recent research on population and the environment. A majority of the existing migration and environment literature has focused on the environmental causes and determinants of migration. With the largest rural-to-urban migration flow in world history, and growing concerns about the environmental problems accompanying its fast economic development, China provides a particularly important case for migration and environment research. This paper reviews major migration theories and recent research on environmental effects on migration, with specific attention to the influences of en- vironmental factors on rural-to-urban labor migration in China. A comprehensive multilevel conceptual framework is developed for studying the environmental causes of rural-to-urban migration in China. The effects of land resources on household labor migration decisions in rural China are explored to illustrate the application of this framework.