Mitsubishi

About: Mitsubishi is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Layer (electronics) & Signal. The organization has 53115 authors who have published 54821 publications receiving 870150 citations. The organization is also known as: Mitsubishi Group of Companies & Mitsubishi Companies.

DFT-based hybrid antenna selection schemes for spatially correlated MIMO channels

Abstract: In this letter, we address the antenna subset selection problem in spatially correlated multiple-input multiple-output (MIMO) channels. To reduce the severe performance degradation of the traditional antenna selection scheme in correlated channels, we propose to embed fast Fourier transform operations in the RF chains. The resulting system shows a significant advantage both for diversity schemes and for the capacity of spatial multiplexing, while requiring only a minor hardware overhead.

MPEG-21 digital item adaptation: enabling universal multimedia access

Abstract: The access devices of today are becoming increasingly sophisticated. Thanks to multimedia, communication is much widespread and therefore more powerful. However, we face a serious problem of heterogeneity in our terminals, in our networks, and in the people who ultimately consume and interact with the information presented to them. In this article, we focus on Part 7 of the MPEG-21 standard (ISO/IEC 21000-7), which we refer to as Digital Item Adaptation (DIA). At the time of this writing, the DIA specification is at the penultimate stage of Final Committee Draft (2003); final approval is scheduled for December 2003. The general DIA concept is that Digital Item is subject to both a resource adaptation and a descriptor adaptation engine, which together produce the adapted Digital Item. Note that the standard specifies only the tools that assist with the adaptation process, not the adaptation engines themselves. Digital Item Adaptation (DIA) specifies the following natural environment description tools: location and time and audiovisual environment. The DIA offers a rich set of tools to assist with the adaptation of Digital Items. It offers standardized tools for the description of usage environments, tools to create high-level descriptions of the bitstream syntax to achieve format-independent adaptation, tools that assist in making tradeoffs between feasible adaptation operations and constraints, tools that enable low-complexity adaptation of metadata, and tools for session mobility. Moving forward, the MPEG-21 committee is considering amendments to the specification-for instance, tools that provide further assistance with modality conversion and tools that relate more specifically to the adaptation of audio and graphics media. Furthermore, also being actively considered is how to express the rights that a User has to perform adaptation and how this expression fits into a system that governs those rights.

Real-Time Motion Trajectory-Based Indexing and Retrieval of Video Sequences

Abstract: This paper presents a novel motion trajectory-based compact indexing and efficient retrieval mechanism for video sequences. Assuming trajectory information is already available, we represent trajectories as temporal ordering of subtrajectories. This approach solves the problem of trajectory representation when only partial trajectory information is available due to occlusion. It is achieved by a hypothesis testing-based method applied to curvature data computed from trajectories. The subtrajectories are then represented by their principal component analysis (PCA) coefficients for optimally compact representation. Different techniques are integrated to index and retrieve subtrajectories, including PCA, spectral clustering, and string matching. We assume a query by example mechanism where an example trajectory is presented to the system and the search system returns a ranked list of most similar items in the dataset. Experiments based on datasets obtained from University of California at Irvine's KDD archives and Columbia University's DVMM group demonstrate the superiority of our proposed PCA-based approaches in terms of indexing and retrieval times and precision recall ratios, when compared to other techniques in the literature

Mobile telephone device with low power consumption

Abstract: A mobile telephone device comprises a separate paging signal channel in addition to the conventional transceiver channels which process voice signals The paging signal channel has a lower power consumption level than the transceiver channels A power supply control device shuts off power to the conventional transceiver channels when in a standby mode, ie when waiting for an incoming call, and applies power to the paging signal channel instead Therefore, power consumption is reduced in the standby mode and consequently, the operating time of the battery is extended Power is applied to the transceiver channels during voice communication periods A calling party's telephone number received in the paging signal channel is stored and displayed A control unit has the capability of immediately returning the calling party's call from the telephone number so stored and displayed

Lithium ion secondary battery and method of fabricating thereof

Abstract: To obtain a lithium ion secondary battery having excellent charge and discharge characteristics in which electric connection between active material layers and a separator can be maintained without requiring a strong armor metal case, so that it can be made into thin forms having large energy density. Convex parts and concave parts are formed on at least two surfaces among surfaces of a positive electrode active material layer 7 and a negative electrode active material layer 9 both adjacent to a separator 4 and surfaces of the separator 4 facing both of the active material layers 7, 9, and these three means are bonded and closely adhered by an adhesive resin layer 11 and electrically connected by keeping a lithium ion-containing electrolytic solution in the separator 4 and voids 12 formed by a bonded surface 11a of the convex parts and the concave parts.