Hidekazu Matsumoto

A high-performance architecture for variable length instructions

This paper considers a high-performance architecture for Variable Length Instructions (VLI) and its evaluation. The VLI studied here are characterized by a multioperand which can treat several independent operands, and orthogonality which can specify the operand address independently of the operation code. This architecture consists of the pipeline processing method suitable for multioperand instruction format, instruction/data separate-type dual cache memory configuration to obtain memory throughput necessary for efficient operation of pipeline, and the operand location-free microprogramming method with virtualized operand interface. The basic ideas of the pipeline processing method are the operand specifier (OSP) based pipeline processing which is realized by Inter-OSP based pipeline processing and two simultaneously processing OSPs. From the mixed value analysis and the simulation result, it is clarified that this architecture makes it possible to improve the performance 1.8 times faster than without it. The additional hardware increase for this architecture is 33%.

User-Centered Video: transmitting video images based on the user's interest

Many applications, such as video conference systems and remotely controlled systems, need to transmit multiple video images through narrow band networks. However, high quality transmission of the video images is not possible within the network bandwidth. This paper describes a technique, User-Centered Video (UCV), which transmits multiple video images through a network by changing quality of the video images based on a users interest. The UCV assigns a network data rate to each video image in proportion to the users interest. The UCV transmits video images of interest with high quality, while degrading the remaining video images. The video images are degraded in the space and time domains (e.g., spatial resolution, frame rate) to fit them into the assigned data rates. The UCV evaluates the degree of the users interest based on the window layouts. The user thereby obtains both the video images of interest, in detail, and the global context of video images, even through a narrow band network.