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.

Graphic layout compaction system capable of compacting a layout at once

Abstract: In a graphic layout compaction system for compacting a layout where components and routes are placed on a two-dimensional space, a terminal graph generator prepares terminal graph data indicative of terminal graphs having component terminals as nodes. The terminal graph generator calculates, as a movement amount for allowing a first component terminal to come near a second component terminal, a movement limit area within which the first component terminal can move in any directions towards the second component terminal in consideration of a route bandwidth interposed therebetween. A component compactor moves the first component terminal on a position where the first component terminal is not interfered with the movement limit area. A rerouting unit shapes routes into shaped routes having configurations including oblique parts to reroute the shaped routes in a space between the first and the second component terminals.

Wireless ATM networks: architecture, system design and prototyping

Abstract: The concept of "wireless ATM", first proposed in 1992, is now being actively considered as a potential framework for next-generation wireless communication networks capable of supporting integrated, quality-of-service (QoS) based multimedia services. We outline the technological rationale for wireless ATM, present a system-level reference architecture, discuss key subsystem design issues, and summarize early prototyping results for a proof-of-concept system called "WATMnet". The reference architecture for wireless ATM consists of two major components: (a) a "radio access layer" for extension of ATM services over a wireless medium and (b) a "mobile ATM" infrastructure network capable of supporting terminal migration. Design considerations for both the radio access layer (e.g. physical layer, medium access control and data link control) and mobile ATM (e.g. handoff control, location management and routing/QoS control) are discussed, and key technical issues are identified in each case. An overview of experiences with the "WATMnet" system prototype developed at NEC USA's C&C Research Laboratories is given in conclusion.

Internet scrapbook: automating Web browsing tasks by demonstration

Abstract: This paper describes a programming-by-demonstration system, called Internet Scrapbook, which allows users with little programming skill to automate repetitive browsing tasks. With the system, the user can create a personal page by clipping only the necessary portions from multiple Web pages. Once the personal page is created, the system updates it on behalf of the user by extracting the specified parts from the latest Web pages. The data extraction method in Scrapbook is based on the regularity in modifications of Web pages, i.e. that headings and positions of articles are rarely changed even though the articles themselves are modified. In the experiments to examine the accuracy of the data extraction algorithm, 96 percent of user-specified portions were correctly extracted.

Optical transmission control apparatus utilizing metal films perforated with subwavelength-diameter holes

Abstract: Generally speaking, in accordance with the invention, an optical transmission modulation apparatus is provided for modulating light transmitted through the apparatus. The apparatus comprises a metal film having a periodic array of subwavelength-diameter holes provided therein, and a supporting layer. At least a portion of the supporting layer has a selectively variable refractive index, the selectively variable refractive index portion being substantially adjacent to the metal film such that the metal film and the supporting layer form a perforated metal film unit. Selective variation of the refractive index of the selectively variable refractive index portion modulates the intensity of the light transmitted through the perforated metal film unit without substantially changing the direction of the light. Flat panel displays, spatial light modulators and tunable optical filters based on the optical transmission control apparatus are also provided.