Digital library has barriers in the process of obtaining the copyright. Copyright collective management system is conducive to resolving the difficulties of digital library.
数字图书馆在取得授权的过程中存在障碍，著作权集体管理制度有利于解决数字图书馆的授权困难。
Relimit the rational utilization scope for library. Bestow the essential legal permit on library. Perfect the system of collective control for copyright.
要重新界定图书馆合理使用的范畴，赋予图书馆必要的法定许可，完善版权集体管理制度。
Broadcast is the most typical collective communication operation in an MPI library, it directly affects the performance of MPI applications.
mpi库中的集合通信操作中最典型的操作就是广播，广播通信性能的好坏直接影响了MPI应用程序的性能。
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