Abstract: A method and system for providing access to resources at a host computer to a remote user, without requiring the remote user to have detailed knowledge of the host computer. The system includes a host virtual operating system, resident on a host computer and having a set of resources including process control, a file system, interprocess communications, and a set of device interfaces, overlaid on and distinguished from the host computer's actual resources. The virtual host is capable of executing programs in a standardized programming language, to provide the ability to run programs that are host-independent. The virtual host is capable of limiting access to the host computer's actual resources. The system also includes a front-end invoked by the remote user. A server program at the host computer receives requests from a client program run by the remote user, and provides the virtual host operating system at the host computer.
Abstract: The invention provides a method and system for computing transcendental functions quickly: (1) the multiply ALU is enhanced to add a term to the product, (2) rounding operations for intermediate multiplies are skipped, and (3) the Taylor series is separated into two partial series which are performed in parallel. Transcendental functions with ten terms (e.g., SIN or COS), are thus performed in about ten clock times.
Abstract: A method and system for treating aneurysms by applying RF energy to collagen. A catheter is disposed near the aneurysm and collagen is exuded into or near the aneurysm. RF energy is applied, using the same catheter or a second catheter, to the collagen, causing the collagen to harden and cover the weak region of the blood vessel wall, and providing a base onto which epithelial cells of the blood vessel may grow. The catheter comprises an electrophysiology catheter, including a ring electrode preferably disposed to deliver between about 5 and about 30 watts of RF energy at a frequency preferably between about 450 and about 600 Megahertz, to apply sufficient energy to cause the collagen to harden while avoiding damage to surrounding tissue.
July 10, 1996
Date of Patent:
July 13, 1999
Lawrence G. Mohr, Jr., Stuart D. Edwards
Abstract: A method and system for routing packets, in which the resources consumed by broadcast packets are limited. Broadcast packets are placed in a separate queue that is managed independently of the buffer interface queue for non-broadcast packets. The broadcast queue is limited to a selected amount of communication bandwidth; when the amount of broadcast traffic exceeds the selected bandwidth, broadcast messages are queued and held for transmission until later (i.e., when the selected amount of bandwidth becomes available). An operator may specify a maximum number of broadcast packets to be sent in any one second period, an a maximum number of broadcast packet bytes to be sent in any one second period.
Abstract: A method and system for coupling a coprocessor to a master device, in which the coprocessor emulates an memory interface to the master device, like that of a memory device. The coprocessor is coupled to a memory bus and receives memory accesses directed to a set of addresses not covered by memory devices also coupled to the memory bus. The coprocessor is disposed to receive data written from the master device, perform a coprocessing function on that data, and respond to a read data command from the master device with processing results. The coprocessor uses memory block transfers to read data from and write data to memory devices also coupled to the memory bus. A general purpose computer system comprises a central processor and memory coupled to a PCI bus, a graphics processor and graphics memory coupled to the PCI bus, and a coprocessor coupled to the graphics processor and graphics memory.