Abstract: Provided are a virtual computing accelerator and program downloading method for server-based virtual computing. The virtual computing accelerator divides a program allocated to a virtual memory into groups, such as pages or segments, and downloads the groups of program data in sequence. Here, the groups of program data are downloaded after download sequence is estimated on the basis of statistical data accumulated in a hash table, or only a part that must be first downloaded is downloaded in advance. Thus, a program-execution wait time of a client can be reduced. In addition, only a part of a possibly required program is transferred in advance, and the client can execute the application program using only a small amount of virtual memory.

Abstract: A multi-channel packet switching apparatus having traffic flow controlling and checking functions which is capable of simply controlling the system and having a simpler construction by concurrently performing a cell copy function and a cell routing function for providing a multi-casting function.

Abstract: An improved packet switching apparatus with multichannel and multi-cast switching functions and a packet switching system using the same which are capable of more simplifying the routing of an internal routing during the integration of the switching apparatus by using a simpler 2.times.2 switch device for a concentration network in order to provide a routing network and a recirculation path and by using a pattern connection characteristic consisting of a column and row.

Abstract: A multi-channel, multicasting switch for an ATM network utilizes a particular nonblocking condition of the Flip Network, which is exploited to realize a multi-channel switching architecture that supports an arbitrary number of channel groups. Using a single Flip Network recursively, the resulting architecture becomes efficient in the sense that the crosspoint complexity is O(N log.sub.2 N) for N inputs. The number of times the Flip Network is used recursively is a function of the number of channel groups only. The architecture is internally nonblocking and bufferless. Distinguishing features are the abilities to provide multicasting, super-rate switching (i.e., rates that exceed the capacity of a single channel are accommodated), multi-rate switching (i.e., bit pipes of different rates are supported simultaneously), multiple performance requirements (i.e., services with different performance requirements are treated accordingly), and fairness (i.e.

Abstract: A multi-channel, multicasting switch for an ATM network utilizes a particular nonblocking condition of the Flip Network, which is exploited to realize a multi-channel switching architecture that supports an arbitrary number of channel groups. Using a single Flip Network recursively, the resulting architecture becomes efficient in the sense that the crosspoint complexity is O(N log.sub.2 N) for N inputs. The number of times the Flip Network is used recursively is a function of the number of channel groups only. The architecture is internally nonblocking and bufferless. Distinguishing features are the abilities to provide multicasting, super-rate switching (i.e., rates that exceed the capacity of a single channel are accommodated), multi-rate switching (i.e., bit pipes of different rates are supported simultaneously), multiple performance requirements (i.e., services with different performance requirements are treated accordingly), and fairness (i.e.