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In the process of virtual machine live migration, the use of pre-copy technique can effectively reduce the downtime. However, when the generation rate of dirty pages is higher than the transmission rate, the dirty pages will accumulate, resulting in the failure of live migration. To avoid the live migration get failed, this paper proposes a method that can ensure the success of live migration by reducing the activity of CPU and adding a mandatory stop condition. The experimental results show that the total time of live migration and the transmission data size are decreased by the proposed method.

The Component Library(CL)is the key to realize software reuse, the CL available on the network is decentralized, independent, not easy to access at present and existing component libraries face infrastructure supply and maintenance challenges. The authors use cloud computing model, which contribute to resolve the issues of visiting different component libraries and the scalability of component library resources. In this paper, we discuss the plan that placed the CL in the cloud infrastructure and put forward a hierarchical organizational model of component resources based on cloud storage to achieve component integration services. We also explore the component library retrieval framework in the cloud and verify the cloud model applied to component library retrieval based on the Hadoop platform can improve the system performance and achieve the scalability of the computing power.

Introduce the pigs' payoffs in society, analyse the negative infection of pigs' payoffs on the peer-to-peer network, base on usability, reliability, security and extensible speciality. And give a solution for the question base on the incentive mechanism. Finally, future works about the mechanisms discouraging pigs' payoffs in P2P networks are outlined.

The maintenance of software complexity and management of its evolution is two most important points to be solved by software engineering. The separation of concerns is a kind of solution. Thus aspect oriented software development (AOSD) was aroused and shed new software evolution problems. For example separating or integrating crosscutting concerns. In this paper we focus on design a model weaving framework to support aspect-oriented dynamic software evolution in architecture level. Hence we propose a MDA based model weaving framework (MMWF), to formalize the underlying mechanisms of aspect dynamic weaving in architecture level. That separates concerns and improves the abstract level by modeling the crosscutting concerns to aspect model and dynamic integrate them into base component. And it is well regulated and executable as well as achieve the software easy evolution and maintenance.

With the rapid development of the current information networks, there are various databases, operating systems and network platforms coexisting in the networks. Therefore, it is important to find a remote interactive way to manipulate the various databases on a uniform operating platform. We demonstrated the feasibility of such a way in the three-tier client/server architecture (BWD) based on the theory of telecommunications management networks (TMN), and the simulation of which in an experimental environment has been realized.