It is distributed object technology that combined by network and object oriented technology in 90's last century, and it is difficult to extend across Internet. Contributed by HTTP and XML, Web service is becoming the component called through the Web. In this article, we describe and analyze some current distributed object technologies,and then introduce the emerging Web Service technology. We introduce and analyze the two software strategies: Microsoft . NET and Sun ONE. Web Services will transform the current isolated Internet Web into interconnected services.
One of the significant tasks when designing a VoD(Video-on-Demand) system is to support as many simul-taneous streams as possible. Obviously, it is closely related to the storage subsystem. In this paper, we compare theperformance of the storage subsystems based on two different designs by simulation, one data placement policy is us-ing the technique of striping, and the other is simply placing a whole video only in one server. We find that, when da-ta is CBR (Constant-Bit-Rate) coded, the numbers of simultaneous streams respectively supported by the twoschemes are equal, but the latter can present better service.
