NEC

About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.

Content addressable memory of a simple construction capable of retrieving a variable word length data

Abstract: A content addressable memory system includes one retrieval sense amplifier provided in common with a plurality of memory words. A logic operation between a result of retrieval outputted from the sense amplifier and the result of a preceding retrieval stored in a one-bit working register provided for the same sense amplifier is carried out by a control gate also provided for the same sense amplifier, and the result of the logic operation is stored back in the same working register. A plurality of working registers may be provided for each control gate and sense amplifier. The content addressable memory system can retrieve a variable word length data and can be realized with a reduced circuit area.

Advanced Groupband Data Modem Using Orthogonally Multiplexed QAM Technique

Abstract: An advanced groupband data modem based on the orthogonally multiplexed QAM technique is proposed. Its performance is evaluated through experiments. In the proposed modem, data are transmitted by a number of orthogonally multiplexed parallel subchannels. Because of this orthogonally multiplexing parallelism, the proposed modem becomes more immune to Gaussian noises, impulsive noises, and channel distortions, compared to the conventional Class IV partial response VSB modem. Furthermore, the orthogonally multiplexed QAM modem retains high flexibility in multiplexing a variety of data terminals and in carrying out fallback operation to a wide range of data rates. Experimental results demonstrate the robustness of the proposed groupband data modem.

Display apparatus, and driving circuit for the same

Abstract: A drive circuit for a display apparatus includes a gradation voltage generation circuit and a D/A conversion circuit. The gradation voltage generation circuit generates a plurality of different first gradation voltages and a plurality of different second gradation voltages. The D/A conversion circuit drives a light emitting element of a pixel through a data line with a gradation voltage based on one of the first gradation voltages as a first specific gradation voltage in a precharge period and drives the light emitting element of the pixel through the data line with a gradation current based on one of the second gradation voltages as a second specific gradation voltage. The D/A conversion circuit includes a voltage driver to drive the light emitting element, and a current driver to drive the light emitting element.

AMORE: A World Wide Web image retrieval engine

Abstract: Search engines are useful because they allow the user to find information of interest from the World Wide Web. However, most of the popular search engines today are textuals they do not allow the user to find images from the Web. This paper describes AMORE, a Web search engine that allows the user to retrieve images from the Web by specifying relevant keywords or a similar image. Text and image search can also be combined. Moreover, we have developed a Query Result Visualization Environment that allows the organization of the results if many images are retrieved. In this paper we present AMORE’s user interface and explain the technique for retrieving images visually similar to a user specified image. The method of automatically assigning relevant keywords to the images is then explained. Finally, the architecture of the system as well as some interesting observations of our experiences with AMORE are discussed.

Method and apparatus for security policy management

Abstract: A security policy management system for deriving a security policy from setting details of security devices as components of an information system includes a setting information storage unit for storing setting information representing settings with regard to security functions of devices included in a network system to be managed, and a general-purpose security policy generator for generating a security policy including a description expressed in a format independent of descriptions depending on particular devices, based on the setting information stored in the setting information storage unit.