Mitsubishi Electric

About: Mitsubishi Electric is a company organization based out in Ratingen, Germany. It is known for research contribution in the topics: Signal & Voltage. The organization has 23024 authors who have published 27591 publications receiving 255671 citations. The organization is also known as: Mitsubishi Electric Corporation & Mitsubishi Denki K.K..

Three-dimensional IC trends

Abstract: VLSI will be reaching to the limit of minimization in the 1990s, and after that, further increase of packing density or functions might depend on the vertical integration technology. Three-dimensional (3-D) integration is expected to provide several advantages, such as 1) parallel processing, 2) high-speed operation, 3) high packing density, and 4) multifunctional operation. Basic technologies of 3-D IC are to fabricate SOI layers and to stack them monolithically. Crystallinity of the recrystallized layer in SOI has increasingly become better, and very recently crystalaxis controlled, defect-free single-crystal area has been obtained in chip size level by laser recystallization technology. Some basic functional medels showing the concept or image of a future 3-D IC were fabricated in two or three stacked active layers. Some other proposals of subsystems in the application of 3-D structure, and the technical issues for realizing practical 3-D IC, i.e., the technology for fabricating high-quality SOI crystal on complicated surface topology, crosstalk of the signals between the stacked layers, total power consumption and cooling of the chip, will also be discussed in this paper.

Collaborative filtering with the simple Bayesian classifier

Abstract: Many collaborative filtering enabled Web sites that recommend books, CDs, movies, and so on, have become very popular on the Internet. They recommend items to a user based on the opinions of other users with similar tastes. In this paper, we discuss an approach to collaborative filtering based on the Simple Bayesian Classifier. We defme two variants of the recommendation problem for the Simple Bayesian Classifier. In our approach, we calculate the similarity between users from negative ratings and positive ratings separately. We evaluated these algorithms using databases of movie recommendations and joke recommendations. Our empirical results show that one of our proposed Bayesian approaches significandy outperforms a correlation-based collaborative filtering algorithm. The other model outperforms as well although it shows similar performance to the correlation-based approach in some parts of our experiments.

Image encoding device, image decoding device, image encoding method, and image decoding method

Abstract: An encoding device includes a color component separating unit for separating an input bit stream for the respective color components, a block dividing unit for dividing an input color component signal into blocks to generate a signal of an encoding unit area, a predicted image generating unit for generating a predicted image for the signal, a determining unit for determining a prediction mode used for encoding according to a prediction efficiency of the predicted image, a prediction error encoding unit for encoding a difference between the predicted image corresponding to the prediction mode determined by the determining unit and the input color component signal, and an encoding unit for variable length-coding the prediction mode, an output from the prediction error encoding unit, and a color component identification flag indicating the color component to which the input bit stream belongs as a result of the color component separation.

Integrated optical SSB modulator/frequency shifter

Abstract: A novel light single-sideband modulator, or frequency shifter, of integrated optics structure is proposed. The operation was confirmed by constructing and testing the device using Ti indiffused LiNbO 3 waveguides. The first demonstration of frequency shifting was carried out at 2 GHz, and either the upper or lower single-sideband output without carrier was obtained. Conversion efficiency of -5 dB was achieved with input drive power of 730 mW.

Image Stabilization System for Hinode (Solar-B) Solar Optical Telescope

Abstract: The Hinode Solar Optical Telescope (SOT) is the first space-borne visible-light telescope that enables us to observe magnetic-field dynamics in the solar lower atmosphere with 0.2 – 0.3 arcsec spatial resolution under extremely stable (seeing-free) conditions. To achieve precise measurements of the polarization with diffraction-limited images, stable pointing of the telescope (<0.09 arcsec, 3σ) is required for solar images exposed on the focal plane CCD detectors. SOT has an image stabilization system that uses image displacements calculated from correlation tracking of solar granules to control a piezo-driven tip-tilt mirror. The system minimizes the motions of images for frequencies lower than 14 Hz while the satellite and telescope structural design damps microvibration in higher frequency ranges. It has been confirmed from the data taken on orbit that the remaining jitter is less than 0.03 arcsec (3σ) on the Sun. This excellent performance makes a major contribution to successful precise polarimetric measurements with 0.2 – 0.3 arcsec resolution.